Docker image for gateway

Mixnode dockerfile
Fix topology log (#962 )
2021-12-15 16:11:05 +00:00 · 2021-12-15 15:02:00 +00:00 · 2021-12-15 13:19:34 +02:00 · 2021-12-15 10:37:47 +00:00 · 2021-12-15 10:14:41 +00:00 · 2021-12-14 16:06:02 +00:00
333 changed files with 34200 additions and 17761 deletions
@@ -1,4 +1,4 @@
-name: Mixnet Contract
+name: Contracts

 on:
  push:
@@ -21,7 +21,7 @@ jobs:
        with:
          inputFile: '.github/workflows/contract_matrix_includes.json'
          filter: '[?runOnEvent==`${{ github.event_name }}` || runOnEvent==`always`]'
-  mixnet-contract:
+  contracts:
    # since it's going to be compiled into wasm, there's absolutely
    # no point in running CI on different OS-es
    runs-on: ubuntu-latest
@@ -45,20 +45,20 @@ jobs:
          RUSTFLAGS: '-C link-arg=-s'
        with:
          command: build
-          args: --manifest-path contracts/mixnet/Cargo.toml --target wasm32-unknown-unknown
+          args: --manifest-path contracts/Cargo.toml --all --target wasm32-unknown-unknown

      - uses: actions-rs/cargo@v1
        with:
          command: test
-          args: --manifest-path contracts/mixnet/Cargo.toml
+          args: --manifest-path contracts/Cargo.toml

      - uses: actions-rs/cargo@v1
        with:
          command: fmt
-          args: --manifest-path contracts/mixnet/Cargo.toml -- --check
+          args: --manifest-path contracts/Cargo.toml --all -- --check

      - uses: actions-rs/cargo@v1
        if: ${{ matrix.rust != 'nightly' }}
        with:
          command: clippy
-          args: --manifest-path contracts/mixnet/Cargo.toml -- -D warnings
+          args: --manifest-path contracts/Cargo.toml --all -- -D warnings
@@ -1,58 +0,0 @@
-name: ERC20 Bridge Contract
-
-on: [ push, pull_request ]
-
-jobs:
-  matrix_prep:
-    runs-on: ubuntu-latest
-    outputs:
-      matrix: ${{ steps.set-matrix.outputs.matrix }}
-    steps:
-      # creates the matrix strategy from build_matrix_includes.json
-      - uses: actions/checkout@v2
-      - id: set-matrix
-        uses: JoshuaTheMiller/conditional-build-matrix@main
-        with:
-          inputFile: '.github/workflows/contract_matrix_includes.json'
-          filter: '[?runOnEvent==`${{ github.event_name }}` || runOnEvent==`always`]'
-  erc20-bridge-contract:
-    needs: matrix_prep
-    strategy:
-      matrix: ${{fromJson(needs.matrix_prep.outputs.matrix)}}
-    # since it's going to be compiled into wasm, there's absolutely
-    # no point in running CI on different OS-es
-    runs-on: ubuntu-latest
-    continue-on-error: ${{ matrix.rust == 'nightly' }}
-    steps:
-      - uses: actions/checkout@v2
-
-      - uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: ${{ matrix.rust }}
-          target: wasm32-unknown-unknown
-          override: true
-          components: rustfmt, clippy
-
-      - uses: actions-rs/cargo@v1
-        env:
-          RUSTFLAGS: '-C link-arg=-s'
-        with:
-          command: build
-          args: --manifest-path contracts/erc20-bridge/Cargo.toml --target wasm32-unknown-unknown
-
-      - uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --manifest-path contracts/erc20-bridge/Cargo.toml
-
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --manifest-path contracts/erc20-bridge/Cargo.toml -- --check
-
-      - uses: actions-rs/cargo@v1
-        if: ${{ matrix.rust != 'nightly' }}
-        with:
-          command: clippy
-          args: --manifest-path contracts/erc20-bridge/Cargo.toml -- -D warnings
@@ -22,6 +22,8 @@ jobs:
        node-version: '14'
    - run: npm install
      continue-on-error: true
+    - name: Set environment from the example
+      run: cp .env.prod .env
    - run: npm run test
      continue-on-error: true
    - run: npm run build
@@ -1,4 +1,4 @@
-name: Publish Tauri Wallet
+name: Publish Nym Wallet
 on:
  push:
    tags:
@@ -24,6 +24,7 @@ v6-topology.json
 /explorer/downloads/topology.json
 /explorer/public/downloads/mixmining.json
 /explorer/public/downloads/topology.json
+/nym-wallet/dist/*
 /clients/validator/examples/nym-driver-example/current-contract.txt
 validator-api/v4.json
 validator-api/v6.json
@@ -33,4 +34,5 @@ contracts/mixnet/code_id
 contracts/mixnet/Justfile
 contracts/mixnet/Makefile
 validator-config
-*.patch
+*.patch
+validator-api-config.toml
@@ -420,7 +420,10 @@ version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
 dependencies = [
+ "lazy_static",
 "memchr",
+ "regex-automata",
+ "serde",
 ]

 [[package]]
@@ -504,6 +507,15 @@ dependencies = [
 "system-deps 3.2.0",
 ]

+[[package]]
+name = "cast"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c24dab4283a142afa2fdca129b80ad2c6284e073930f964c3a1293c225ee39a"
+dependencies = [
+ "rustc_version 0.4.0",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.70"
@@ -667,30 +679,11 @@ dependencies = [
 name = "coconut-interface"
 version = "0.1.0"
 dependencies = [
- "coconut-rs",
 "getset",
+ "nymcoconut",
 "serde",
 ]

-[[package]]
-name = "coconut-rs"
-version = "0.5.0"
-source = "git+https://github.com/nymtech/coconut.git?branch=0.5.0#a1b72d51aa2a67b73b9f58d707030ae6dc70af7f"
-dependencies = [
- "bls12_381",
- "bs58",
- "digest 0.9.0",
- "ff",
- "getrandom 0.2.3",
- "group",
- "itertools",
- "rand 0.8.4",
- "serde",
- "serde_derive",
- "sha2",
- "thiserror",
-]
-
 [[package]]
 name = "colored"
 version = "2.0.0"
@@ -875,8 +868,7 @@ dependencies = [
 [[package]]
 name = "cosmos-sdk-proto"
 version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "edb5204c6ddc4352c74297638b5561f2929d6334866c156e5f3c75e1e1a1436a"
+source = "git+https://github.com/cosmos/cosmos-rust?rev=e5a1872083abb3d88fa62dda966e7f5408deba58#e5a1872083abb3d88fa62dda966e7f5408deba58"
 dependencies = [
 "prost",
 "prost-types",
@@ -886,8 +878,7 @@ dependencies = [
 [[package]]
 name = "cosmrs"
 version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d31147fe89e547e74e2692e4bec35387e1ea406fe8cfb14c0ea177b58fd2a8a9"
+source = "git+https://github.com/cosmos/cosmos-rust?rev=e5a1872083abb3d88fa62dda966e7f5408deba58#e5a1872083abb3d88fa62dda966e7f5408deba58"
 dependencies = [
 "bip32",
 "cosmos-sdk-proto",
@@ -908,8 +899,9 @@ dependencies = [

 [[package]]
 name = "cosmwasm-crypto"
-version = "0.14.1"
-source = "git+https://github.com/jstuczyn/cosmwasm?branch=0.14.1-updatedk256#308781cd5f33b0e996176c6b500793d3648c0f7b"
+version = "1.0.0-beta2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c16b255449b3f5cd7fa4b79acd5225b5185655261087a3d8aaac44f88a0e23e9"
 dependencies = [
 "digest 0.9.0",
 "ed25519-zebra",
@@ -920,16 +912,18 @@ dependencies = [

 [[package]]
 name = "cosmwasm-derive"
-version = "0.14.1"
-source = "git+https://github.com/jstuczyn/cosmwasm?branch=0.14.1-updatedk256#308781cd5f33b0e996176c6b500793d3648c0f7b"
+version = "1.0.0-beta2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abad1a6ff427a2f66890a4dce6354b4563cd07cee91a942300e011c921c09ed2"
 dependencies = [
 "syn",
 ]

 [[package]]
 name = "cosmwasm-std"
-version = "0.14.1"
-source = "git+https://github.com/jstuczyn/cosmwasm?branch=0.14.1-updatedk256#308781cd5f33b0e996176c6b500793d3648c0f7b"
+version = "1.0.0-beta2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1660ee3d5734672e1eb4f0ceda403e2d83345e15143a48845f340f3252ce99a6"
 dependencies = [
 "base64",
 "cosmwasm-crypto",
@@ -986,6 +980,42 @@ dependencies = [
 "validator-client",
 ]

+[[package]]
+name = "criterion"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1604dafd25fba2fe2d5895a9da139f8dc9b319a5fe5354ca137cbbce4e178d10"
+dependencies = [
+ "atty",
+ "cast",
+ "clap",
+ "criterion-plot",
+ "csv",
+ "itertools",
+ "lazy_static",
+ "num-traits",
+ "oorandom",
+ "plotters",
+ "rayon",
+ "regex",
+ "serde",
+ "serde_cbor",
+ "serde_derive",
+ "serde_json",
+ "tinytemplate",
+ "walkdir",
+]
+
+[[package]]
+name = "criterion-plot"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d00996de9f2f7559f7f4dc286073197f83e92256a59ed395f9aac01fe717da57"
+dependencies = [
+ "cast",
+ "itertools",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.1"
@@ -1125,6 +1155,28 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "csv"
+version = "1.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22813a6dc45b335f9bade10bf7271dc477e81113e89eb251a0bc2a8a81c536e1"
+dependencies = [
+ "bstr",
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b2466559f260f48ad25fe6317b3c8dac77b5bdb5763ac7d9d6103530663bc90"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ct-logs"
 version = "0.8.0"
@@ -1156,6 +1208,17 @@ dependencies = [
 "zeroize",
 ]

+[[package]]
+name = "cw-storage-plus"
+version = "0.10.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3b8b840947313c1a1cccf056836cd79a60b4526bdcd6582995be37dc97be4ae"
+dependencies = [
+ "cosmwasm-std",
+ "schemars",
+ "serde",
+]
+
 [[package]]
 name = "darling"
 version = "0.10.2"
@@ -1740,6 +1803,7 @@ dependencies = [
 "az",
 "bytemuck",
 "half",
+ "serde",
 "typenum",
 ]

@@ -3464,6 +3528,7 @@ dependencies = [
 "gateway-client",
 "gateway-requests",
 "log",
+ "network-defaults",
 "nymsphinx",
 "pemstore",
 "pretty_env_logger",
@@ -3509,8 +3574,10 @@ name = "nym-gateway"
 version = "0.11.0"
 dependencies = [
 "bip39",
+ "bs58",
 "clap",
 "coconut-interface",
+ "colored",
 "config",
 "credentials",
 "crypto",
@@ -3532,6 +3599,7 @@ dependencies = [
 "rand 0.7.3",
 "serde",
 "sqlx",
+ "subtle-encoding",
 "thiserror",
 "tokio",
 "tokio-stream",
@@ -3567,6 +3635,7 @@ dependencies = [
 "rocket",
 "serde",
 "serial_test",
+ "subtle-encoding",
 "tokio",
 "tokio-util",
 "toml",
@@ -3613,6 +3682,7 @@ dependencies = [
 "gateway-client",
 "gateway-requests",
 "log",
+ "network-defaults",
 "nymsphinx",
 "ordered-buffer",
 "pemstore",
@@ -3670,6 +3740,27 @@ dependencies = [
 "version-checker",
 ]

+[[package]]
+name = "nymcoconut"
+version = "0.5.0"
+dependencies = [
+ "bincode",
+ "bls12_381",
+ "bs58",
+ "criterion",
+ "digest 0.9.0",
+ "doc-comment",
+ "ff",
+ "getrandom 0.2.3",
+ "group",
+ "itertools",
+ "rand 0.8.4",
+ "serde",
+ "serde_derive",
+ "sha2",
+ "thiserror",
+]
+
 [[package]]
 name = "nymsphinx"
 version = "0.1.0"
@@ -3834,6 +3925,12 @@ version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "692fcb63b64b1758029e0a96ee63e049ce8c5948587f2f7208df04625e5f6b56"

+[[package]]
+name = "oorandom"
+version = "11.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
+
 [[package]]
 name = "opaque-debug"
 version = "0.2.3"
@@ -4264,6 +4361,34 @@ version = "0.3.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c9b1041b4387893b91ee6746cddfc28516aff326a3519fb2adf820932c5e6cb"

+[[package]]
+name = "plotters"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a3fd9ec30b9749ce28cd91f255d569591cdf937fe280c312143e3c4bad6f2a"
+dependencies = [
+ "num-traits",
+ "plotters-backend",
+ "plotters-svg",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "plotters-backend"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d88417318da0eaf0fdcdb51a0ee6c3bed624333bff8f946733049380be67ac1c"
+
+[[package]]
+name = "plotters-svg"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "521fa9638fa597e1dc53e9412a4f9cefb01187ee1f7413076f9e6749e2885ba9"
+dependencies = [
+ "plotters-backend",
+]
+
 [[package]]
 name = "pmutil"
 version = "0.5.3"
@@ -4810,6 +4935,12 @@ dependencies = [
 "regex-syntax",
 ]

+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+
 [[package]]
 name = "regex-syntax"
 version = "0.6.25"
@@ -5091,6 +5222,15 @@ dependencies = [
 "semver 0.11.0",
 ]

+[[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver 1.0.4",
+]
+
 [[package]]
 name = "rustls"
 version = "0.19.1"
@@ -5330,6 +5470,16 @@ dependencies = [
 "serde",
 ]

+[[package]]
+name = "serde_cbor"
+version = "0.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2bef2ebfde456fb76bbcf9f59315333decc4fda0b2b44b420243c11e0f5ec1f5"
+dependencies = [
+ "half",
+ "serde",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.130"
@@ -6608,6 +6758,16 @@ dependencies = [
 "crunchy",
 ]

+[[package]]
+name = "tinytemplate"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be4d6b5f19ff7664e8c98d03e2139cb510db9b0a60b55f8e8709b689d939b6bc"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "tokio"
 version = "1.12.0"
@@ -6985,6 +7145,7 @@ dependencies = [
 "thiserror",
 "ts-rs",
 "url",
+ "vesting-contract",
 ]

 [[package]]
@@ -7024,6 +7185,19 @@ version = "0.9.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe"

+[[package]]
+name = "vesting-contract"
+version = "0.1.0"
+dependencies = [
+ "config",
+ "cosmwasm-std",
+ "cw-storage-plus",
+ "mixnet-contract",
+ "schemars",
+ "serde",
+ "thiserror",
+]
+
 [[package]]
 name = "waker-fn"
 version = "1.1.0"
@@ -30,6 +30,7 @@ members = [
    "common/mixnode-common",
    "common/network-defaults",
    "common/nonexhaustive-delayqueue",
+    "common/nymcoconut",
    "common/nymsphinx",
    "common/nymsphinx/acknowledgements",
    "common/nymsphinx/addressing",
@@ -61,6 +62,7 @@ default-members = [
    "service-providers/network-requester",
    "mixnode",
    "validator-api",
+    "explorer-api",
 ]

 exclude = ["explorer", "contracts", "tokenomics-py"]
@@ -0,0 +1,31 @@
+all: clippy test fmt
+clippy: clippy-main clippy-contracts clippy-wallet
+test: test-main test-contracts test-wallet
+fmt: fmt-main fmt-contracts fmt-wallet
+
+clippy-main:
+	cargo clippy
+
+clippy-contracts:
+	cargo clippy --manifest-path contracts/Cargo.toml
+
+clippy-wallet: 
+	cargo clippy --manifest-path nym-wallet/Cargo.toml
+
+test-main:
+	cargo test
+
+test-contracts:
+	cargo test --manifest-path contracts/Cargo.toml
+
+test-wallet:
+	cargo test --manifest-path nym-wallet/Cargo.toml
+
+fmt-main:
+	cargo fmt --all
+
+fmt-contracts:
+	cargo fmt --manifest-path contracts/Cargo.toml --all
+
+fmt-wallet:
+	cargo fmt --manifest-path nym-wallet/Cargo.toml --all
@@ -13,7 +13,7 @@ The platform is composed of multiple Rust crates. Top-level executable binary cr
 * nym-gateway - acts sort of like a mailbox for mixnet messages, removing the need for directly delivery to potentially offline or firewalled devices.
 * nym-network-monitor - sends packets through the full system to check that they are working as expected, and stores node uptime histories as the basis of a rewards system ("mixmining" or "proof-of-mixing").
 * nym-explorer - a (projected) block explorer and (existing) mixnet viewer.
-* nym-wallet (currently in development)- a desktop wallet implemented using the [Tauri](https://tauri.studio/en/docs/about/intro) framework. 
+* nym-wallet - a desktop wallet implemented using the [Tauri](https://tauri.studio/en/docs/about/intro) framework. 

 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg?style=for-the-badge)](https://opensource.org/licenses/Apache-2.0)
 [![Build Status](https://img.shields.io/github/workflow/status/nymtech/nym/Continuous%20integration/develop?style=for-the-badge&logo=github-actions)](https://github.com/nymtech/nym/actions?query=branch%3Adevelop)
@@ -24,7 +24,7 @@ dirs = "3.0" # for determining default store directories in config
 dotenv = "0.15.0" # for obtaining environmental variables (only used for RUST_LOG for time being)
 log = "0.4" # self explanatory
 pretty_env_logger = "0.4" # for formatting log messages
-rand = {version = "0.7.3", features = ["wasm-bindgen"]} # rng-related traits + some rng implementation to use
+rand = { version = "0.7.3", features = ["wasm-bindgen"] } # rng-related traits + some rng implementation to use
 serde = { version = "1.0.104", features = ["derive"] } # for config serialization/deserialization
 sled = "0.34" # for storage of replySURB decryption keys
 tokio = { version = "1.4", features = ["rt-multi-thread", "net", "signal"] } # async runtime
@@ -44,6 +44,7 @@ topology = { path = "../../common/topology" }
 websocket-requests = { path = "websocket-requests" }
 validator-client = { path = "../../common/client-libs/validator-client" }
 version-checker = { path = "../../common/version-checker" }
+network-defaults = { path = "../../common/network-defaults" }

 [features]
 coconut = ["coconut-interface", "credentials", "gateway-requests/coconut", "gateway-client/coconut"]
@@ -3,6 +3,5 @@ module github.com/nymtech/nym/clients/native/examples/go
 go 1.14

 require (
-	github.com/btcsuite/btcutil v1.0.2 // indirect
 	github.com/gorilla/websocket v1.4.2
 )
@@ -1,8 +1,6 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use crate::client::config::{Config, SocketType};
-use crate::websocket;
 use client_core::client::cover_traffic_stream::LoopCoverTrafficStream;
 use client_core::client::inbound_messages::{
    InputMessage, InputMessageReceiver, InputMessageSender,
@@ -24,6 +22,7 @@ use client_core::client::topology_control::{
 use client_core::config::persistence::key_pathfinder::ClientKeyPathfinder;
 use crypto::asymmetric::identity;
 use futures::channel::mpsc;
+use gateway_client::bandwidth::BandwidthController;
 use gateway_client::{
    AcknowledgementReceiver, AcknowledgementSender, GatewayClient, MixnetMessageReceiver,
    MixnetMessageSender,
@@ -35,7 +34,8 @@ use nymsphinx::anonymous_replies::ReplySurb;
 use nymsphinx::receiver::ReconstructedMessage;
 use tokio::runtime::Runtime;

-use gateway_client::bandwidth::BandwidthController;
+use crate::client::config::{Config, SocketType};
+use crate::websocket;

 pub(crate) mod config;

@@ -1,15 +1,23 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use crate::client::config::Config;
-use crate::commands::override_config;
 use clap::{App, Arg, ArgMatches};
 use client_core::client::key_manager::KeyManager;
 use client_core::config::persistence::key_pathfinder::ClientKeyPathfinder;
+#[cfg(feature = "coconut")]
+use coconut_interface::{hash_to_scalar, Credential, Parameters};
 use config::NymConfig;
+#[cfg(feature = "coconut")]
+use credentials::coconut::bandwidth::{
+    obtain_signature, prepare_for_spending, BandwidthVoucherAttributes, TOTAL_ATTRIBUTES,
+};
+#[cfg(feature = "coconut")]
+use credentials::obtain_aggregate_verification_key;
 use crypto::asymmetric::{encryption, identity};
 use gateway_client::GatewayClient;
 use gateway_requests::registration::handshake::SharedKeys;
+#[cfg(feature = "coconut")]
+use network_defaults::BANDWIDTH_VALUE;
 use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
 use rand::rngs::OsRng;
@@ -21,6 +29,9 @@ use std::time::Duration;
 use topology::{filter::VersionFilterable, gateway};
 use url::Url;

+use crate::client::config::Config;
+use crate::commands::override_config;
+
 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
    let app = App::new("init")
        .about("Initialise a Nym client. Do this first!")
@@ -36,9 +47,9 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
            .takes_value(true)
        )
        .arg(Arg::with_name("validators")
-                .long("validators")
-                .help("Comma separated list of rest endpoints of the validators")
-                .takes_value(true),
+                 .long("validators")
+                 .help("Comma separated list of rest endpoints of the validators")
+                 .takes_value(true),
        )
        .arg(Arg::with_name("disable-socket")
            .long("disable-socket")
@@ -71,6 +82,36 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
    app
 }

+// this behaviour should definitely be changed, we shouldn't
+// need to get bandwidth credential for registration
+#[cfg(feature = "coconut")]
+async fn _prepare_temporary_credential(validators: &[Url], raw_identity: &[u8]) -> Credential {
+    let verification_key = obtain_aggregate_verification_key(validators)
+        .await
+        .expect("could not obtain aggregate verification key of validators");
+
+    let params = Parameters::new(TOTAL_ATTRIBUTES).unwrap();
+    let bandwidth_credential_attributes = BandwidthVoucherAttributes {
+        serial_number: params.random_scalar(),
+        binding_number: params.random_scalar(),
+        voucher_value: hash_to_scalar(BANDWIDTH_VALUE.to_be_bytes()),
+        voucher_info: hash_to_scalar(String::from("BandwidthVoucher").as_bytes()),
+    };
+
+    let bandwidth_credential =
+        obtain_signature(&params, &bandwidth_credential_attributes, validators)
+            .await
+            .expect("could not obtain bandwidth credential");
+
+    prepare_for_spending(
+        raw_identity,
+        &bandwidth_credential,
+        &bandwidth_credential_attributes,
+        &verification_key,
+    )
+    .expect("could not prepare out bandwidth credential for spending")
+}
+
 async fn register_with_gateway(
    gateway: &gateway::Node,
    our_identity: Arc<identity::KeyPair>,
@@ -1,8 +1,8 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-pub(crate) mod handler;
-pub(crate) mod listener;
-
 pub(crate) use handler::Handler;
 pub(crate) use listener::Listener;
+
+pub(crate) mod handler;
+pub(crate) mod listener;
@@ -32,13 +32,14 @@ crypto = { path = "../../common/crypto" }
 gateway-client = { path = "../../common/client-libs/gateway-client" }
 gateway-requests = { path = "../../gateway/gateway-requests" }
 nymsphinx = { path = "../../common/nymsphinx" }
-ordered-buffer = {path = "../../common/socks5/ordered-buffer"}
+ordered-buffer = { path = "../../common/socks5/ordered-buffer" }
 socks5-requests = { path = "../../common/socks5/requests" }
 topology = { path = "../../common/topology" }
 pemstore = { path = "../../common/pemstore" }
 proxy-helpers = { path = "../../common/socks5/proxy-helpers" }
 validator-client = { path = "../../common/client-libs/validator-client" }
 version-checker = { path = "../../common/version-checker" }
+network-defaults = { path = "../../common/network-defaults" }

 [features]
 coconut = ["coconut-interface", "credentials", "gateway-requests/coconut", "gateway-client/coconut"]
@@ -1,11 +1,6 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use crate::client::config::Config;
-use crate::socks::{
-    authentication::{AuthenticationMethods, Authenticator, User},
-    server::SphinxSocksServer,
-};
 use client_core::client::cover_traffic_stream::LoopCoverTrafficStream;
 use client_core::client::inbound_messages::{
    InputMessage, InputMessageReceiver, InputMessageSender,
@@ -25,6 +20,7 @@ use client_core::client::topology_control::{
 use client_core::config::persistence::key_pathfinder::ClientKeyPathfinder;
 use crypto::asymmetric::identity;
 use futures::channel::mpsc;
+use gateway_client::bandwidth::BandwidthController;
 use gateway_client::{
    AcknowledgementReceiver, AcknowledgementSender, GatewayClient, MixnetMessageReceiver,
    MixnetMessageSender,
@@ -34,7 +30,11 @@ use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
 use tokio::runtime::Runtime;

-use gateway_client::bandwidth::BandwidthController;
+use crate::client::config::Config;
+use crate::socks::{
+    authentication::{AuthenticationMethods, Authenticator, User},
+    server::SphinxSocksServer,
+};

 pub(crate) mod config;

@@ -1,15 +1,23 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use crate::client::config::Config;
-use crate::commands::override_config;
 use clap::{App, Arg, ArgMatches};
 use client_core::client::key_manager::KeyManager;
 use client_core::config::persistence::key_pathfinder::ClientKeyPathfinder;
+#[cfg(feature = "coconut")]
+use coconut_interface::{hash_to_scalar, Credential, Parameters};
 use config::NymConfig;
+#[cfg(feature = "coconut")]
+use credentials::coconut::bandwidth::{
+    obtain_signature, prepare_for_spending, BandwidthVoucherAttributes, TOTAL_ATTRIBUTES,
+};
+#[cfg(feature = "coconut")]
+use credentials::obtain_aggregate_verification_key;
 use crypto::asymmetric::{encryption, identity};
 use gateway_client::GatewayClient;
 use gateway_requests::registration::handshake::SharedKeys;
+#[cfg(feature = "coconut")]
+use network_defaults::BANDWIDTH_VALUE;
 use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
 use rand::{prelude::SliceRandom, rngs::OsRng, thread_rng};
@@ -19,6 +27,9 @@ use std::time::Duration;
 use topology::{filter::VersionFilterable, gateway};
 use url::Url;

+use crate::client::config::Config;
+use crate::commands::override_config;
+
 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
    let app = App::new("init")
        .about("Initialise a Nym client. Do this first!")
@@ -40,9 +51,9 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
            .takes_value(true)
        )
        .arg(Arg::with_name("validators")
-                .long("validators")
-                .help("Comma separated list of rest endpoints of the validators")
-                .takes_value(true),
+                 .long("validators")
+                 .help("Comma separated list of rest endpoints of the validators")
+                 .takes_value(true),
        )
        .arg(Arg::with_name("port")
            .short("p")
@@ -71,6 +82,36 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
    app
 }

+// this behaviour should definitely be changed, we shouldn't
+// need to get bandwidth credential for registration
+#[cfg(feature = "coconut")]
+async fn _prepare_temporary_credential(validators: &[Url], raw_identity: &[u8]) -> Credential {
+    let verification_key = obtain_aggregate_verification_key(validators)
+        .await
+        .expect("could not obtain aggregate verification key of validators");
+
+    let params = Parameters::new(TOTAL_ATTRIBUTES).unwrap();
+    let bandwidth_credential_attributes = BandwidthVoucherAttributes {
+        serial_number: params.random_scalar(),
+        binding_number: params.random_scalar(),
+        voucher_value: hash_to_scalar(BANDWIDTH_VALUE.to_be_bytes()),
+        voucher_info: hash_to_scalar("BandwidthVoucher"),
+    };
+
+    let bandwidth_credential =
+        obtain_signature(&params, &bandwidth_credential_attributes, validators)
+            .await
+            .expect("could not obtain bandwidth credential");
+
+    prepare_for_spending(
+        raw_identity,
+        &bandwidth_credential,
+        &bandwidth_credential_attributes,
+        &verification_key,
+    )
+    .expect("could not prepare out bandwidth credential for spending")
+}
+
 async fn register_with_gateway(
    gateway: &gateway::Node,
    our_identity: Arc<identity::KeyPair>,
@@ -3,21 +3,24 @@
  windows_subsystem = "windows"
 )]

+use std::sync::Arc;
+
+use tokio::sync::RwLock;
+use url::Url;
+
 use coconut_interface::{
  self, hash_to_scalar, Attribute, Credential, Parameters, Signature, Theta, VerificationKey,
 };
 use credentials::{obtain_aggregate_signature, obtain_aggregate_verification_key};
-use std::sync::Arc;
-use tokio::sync::RwLock;
-use url::Url;

 struct State {
  signatures: Vec<Signature>,
  n_attributes: u32,
  params: Parameters,
-  public_attributes_bytes: Vec<Vec<u8>>,
-  public_attributes: Vec<Attribute>,
-  private_attributes: Vec<Attribute>,
+  serial_number: Attribute,
+  binding_number: Attribute,
+  voucher_value: Attribute,
+  voucher_info: Attribute,
  aggregated_verification_key: Option<VerificationKey>,
 }

@@ -37,9 +40,10 @@ impl State {
      signatures: Vec::new(),
      n_attributes,
      params,
-      public_attributes_bytes,
-      public_attributes,
-      private_attributes,
+      serial_number: private_attributes[0],
+      binding_number: private_attributes[1],
+      voucher_value: public_attributes[0],
+      voucher_info: public_attributes[1],
      aggregated_verification_key: None,
    }
  }
@@ -63,8 +67,8 @@ async fn randomise_credential(
 ) -> Result<Vec<Signature>, String> {
  let mut state = state.write().await;
  let signature = state.signatures.remove(idx);
-  let new = signature.randomise(&state.params);
-  state.signatures.insert(idx, new);
+  let (new_signature, _) = signature.randomise(&state.params);
+  state.signatures.insert(idx, new_signature);
  Ok(state.signatures.clone())
 }

@@ -117,14 +121,15 @@ async fn prove_credential(
  let state = state.read().await;

  if let Some(signature) = state.signatures.get(idx) {
-    match coconut_interface::prove_credential(
+    match coconut_interface::prove_bandwidth_credential(
      &state.params,
      &verification_key,
      signature,
-      &state.private_attributes,
+      state.serial_number,
+      state.binding_number,
    ) {
      Ok(theta) => Ok(theta),
-      Err(e) => Err(format!("{}", e)),
+      Err(e) => Err(format!("{:?}", e)),
    }
  } else {
    Err("Got invalid Signature idx".to_string())
@@ -144,10 +149,15 @@ async fn verify_credential(

  let state = state.read().await;

+  let public_attributes_bytes = vec![
+    state.voucher_value.to_bytes().to_vec(),
+    state.voucher_info.to_bytes().to_vec(),
+  ];
+
  let credential = Credential::new(
    state.n_attributes,
    theta,
-    state.public_attributes_bytes.clone(),
+    public_attributes_bytes,
    state
      .signatures
      .get(idx)
@@ -164,11 +174,13 @@ async fn get_credential(
 ) -> Result<Vec<Signature>, String> {
  let guard = state.read().await;
  let parsed_urls = parse_url_validators(&validator_urls)?;
+  let public_attributes = vec![guard.voucher_value, guard.voucher_info];
+  let private_attributes = vec![guard.serial_number, guard.binding_number];

  let signature = obtain_aggregate_signature(
    &guard.params,
-    &guard.public_attributes,
-    &guard.private_attributes,
+    &public_attributes,
+    &private_attributes,
    &parsed_urls,
  )
  .await
@@ -1,6 +1,6 @@
-import NetClient, {INetClient} from "./net-client";
+import NetClient, { INetClient } from "./net-client";
 import {
-    StateParams,
+    ContractSettingsParams,
    Delegation,
    PagedMixDelegationsResponse,
    PagedGatewayDelegationsResponse,
@@ -10,10 +10,10 @@ import {
    Gateway,
    SendRequest
 } from "./types";
-import {Bip39, Random} from "@cosmjs/crypto";
-import {DirectSecp256k1HdWallet, EncodeObject} from "@cosmjs/proto-signing";
+import { Bip39, Random } from "@cosmjs/crypto";
+import { DirectSecp256k1HdWallet, EncodeObject } from "@cosmjs/proto-signing";
 import MixnodesCache from "./caches/mixnodes";
-import {buildFeeTable, coin, Coin, coins, StdFee} from "@cosmjs/stargate";
+import { buildFeeTable, coin, Coin, coins, StdFee } from "@cosmjs/stargate";
 import {
    ExecuteResult,
    InstantiateOptions,
@@ -32,17 +32,17 @@ import {
    nativeToPrintable
 } from "./currency";
 import GatewaysCache from "./caches/gateways";
-import QueryClient, {IQueryClient} from "./query-client";
-import {nymGasLimits, nymGasPrice} from "./stargate-helper";
-import {BroadcastTxSuccess, isBroadcastTxFailure} from "@cosmjs/stargate";
-import {makeBankMsgSend} from "./utils";
+import QueryClient, { IQueryClient } from "./query-client";
+import { nymGasLimits, nymGasPrice } from "./stargate-helper";
+import { BroadcastTxSuccess, isBroadcastTxFailure } from "@cosmjs/stargate";
+import { makeBankMsgSend } from "./utils";

 export const VALIDATOR_API_PORT = "8080";
 export const VALIDATOR_API_GATEWAYS = "v1/gateways";
 export const VALIDATOR_API_MIXNODES = "v1/mixnodes";

-export {coins, coin};
-export {Coin};
+export { coins, coin };
+export { Coin };
 export {
    displayAmountToNative,
    nativeCoinToDisplay,
@@ -52,7 +52,7 @@ export {
    MappedCoin,
    CoinMap
 }
-export {nymGasLimits, nymGasPrice}
+export { nymGasLimits, nymGasPrice }

 export default class ValidatorClient {
    private readonly client: INetClient | IQueryClient
@@ -226,12 +226,12 @@ export default class ValidatorClient {
     */
    static async mnemonicToAddress(mnemonic: string, prefix: string): Promise<string> {
        const wallet = await ValidatorClient.buildWallet(mnemonic, prefix);
-        const [{address}] = await wallet.getAccounts()
+        const [{ address }] = await wallet.getAccounts()
        return address
    }

    static async buildWallet(mnemonic: string, prefix: string): Promise<DirectSecp256k1HdWallet> {
-        const signerOptions = {prefix: prefix};
+        const signerOptions = { prefix: prefix };
        return DirectSecp256k1HdWallet.fromMnemonic(mnemonic, signerOptions);
    }

@@ -239,7 +239,7 @@ export default class ValidatorClient {
        return this.client.getBalance(address, this.denom).catch((err) => this.handleRequestFailure(err));
    }

-    async getStateParams(): Promise<StateParams> {
+    async getStateParams(): Promise<ContractSettingsParams> {
        return this.client.getStateParams(this.contractAddress).catch((err) => this.handleRequestFailure(err))
    }

@@ -293,7 +293,7 @@ export default class ValidatorClient {
     */
    async bondMixnode(mixNode: MixNode, bond: Coin): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {bond_mixnode: {mix_node: mixNode}}, "adding mixnode", [bond]).catch((err) => this.handleRequestFailure(err));
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { bond_mixnode: { mix_node: mixNode } }, "adding mixnode", [bond]).catch((err) => this.handleRequestFailure(err));
            console.log(`account ${this.client.clientAddress} added mixnode with ${mixNode.host}`);
            return result;
        } else {
@@ -307,7 +307,7 @@ export default class ValidatorClient {
     */
    async unbondMixnode(): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {unbond_mixnode: {}}).catch((err) => this.handleRequestFailure(err))
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { unbond_mixnode: {} }).catch((err) => this.handleRequestFailure(err))
            console.log(`account ${this.client.clientAddress} unbonded mixnode`);
            return result;
        } else {
@@ -324,7 +324,7 @@ export default class ValidatorClient {
    // requires coin type to ensure correct denomination (
    async delegateToMixnode(mixIdentity: string, amount: Coin): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {delegate_to_mixnode: {mix_identity: mixIdentity}}, `delegating to ${mixIdentity}`, [amount]).catch((err) => this.handleRequestFailure(err))
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { delegate_to_mixnode: { mix_identity: mixIdentity } }, `delegating to ${mixIdentity}`, [amount]).catch((err) => this.handleRequestFailure(err))
            console.log(`account ${this.client.clientAddress} delegated ${amount} to mixnode ${mixIdentity}`);
            return result;
        } else {
@@ -339,7 +339,7 @@ export default class ValidatorClient {
     */
    async removeMixnodeDelegation(mixIdentity: string): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {undelegate_from_mixnode: {mix_identity: mixIdentity}}).catch((err) => this.handleRequestFailure(err))
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { undelegate_from_mixnode: { mix_identity: mixIdentity } }).catch((err) => this.handleRequestFailure(err))
            console.log(`account ${this.client.clientAddress} removed delegation from mixnode ${mixIdentity}`);
            return result;
        } else {
@@ -356,7 +356,7 @@ export default class ValidatorClient {
    // requires coin type to ensure correct denomination (
    async delegateToGateway(gatewayIdentity: string, amount: Coin): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {delegate_to_gateway: {gateway_identity: gatewayIdentity}}, `delegating to ${gatewayIdentity}`, [amount]).catch((err) => this.handleRequestFailure(err))
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { delegate_to_gateway: { gateway_identity: gatewayIdentity } }, `delegating to ${gatewayIdentity}`, [amount]).catch((err) => this.handleRequestFailure(err))
            console.log(`account ${this.client.clientAddress} delegated ${amount} to gateway ${gatewayIdentity}`);
            return result;
        } else {
@@ -371,7 +371,7 @@ export default class ValidatorClient {
     */
    async removeGatewayDelegation(gatewayIdentity: string): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {undelegate_from_gateway: {gateway_identity: gatewayIdentity}}).catch((err) => this.handleRequestFailure(err))
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { undelegate_from_gateway: { gateway_identity: gatewayIdentity } }).catch((err) => this.handleRequestFailure(err))
            console.log(`account ${this.client.clientAddress} removed delegation from gateway ${gatewayIdentity}`);
            return result;
        } else {
@@ -450,7 +450,7 @@ export default class ValidatorClient {
     */
    async bondGateway(gateway: Gateway, bond: Coin): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {bond_gateway: {gateway: gateway}}, "adding gateway", [bond]).catch((err) => this.handleRequestFailure(err));
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { bond_gateway: { gateway: gateway } }, "adding gateway", [bond]).catch((err) => this.handleRequestFailure(err));
            console.log(`account ${this.client.clientAddress} added gateway with ${gateway.host}`);
            return result;
        } else {
@@ -463,7 +463,7 @@ export default class ValidatorClient {
     */
    async unbondGateway(): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, {unbond_gateway: {}}).catch((err) => this.handleRequestFailure(err))
+            const result = await this.client.executeContract(this.client.clientAddress, this.contractAddress, { unbond_gateway: {} }).catch((err) => this.handleRequestFailure(err))
            console.log(`account ${this.client.clientAddress} unbonded gateway`);
            return result;
        } else {
@@ -471,9 +471,9 @@ export default class ValidatorClient {
        }
    }

-    async updateStateParams(newParams: StateParams): Promise<ExecuteResult> {
+    async updateStateParams(newParams: ContractSettingsParams): Promise<ExecuteResult> {
        if (this.client instanceof NetClient) {
-            return await this.client.executeContract(this.client.clientAddress, this.contractAddress, {update_state_params: newParams}, "updating contract state").catch((err) => this.handleRequestFailure(err));
+            return await this.client.executeContract(this.client.clientAddress, this.contractAddress, { update_contract_settings: newParams }, "updating contract settings").catch((err) => this.handleRequestFailure(err));
        } else {
            throw new Error("Tried to update state params with a query client")
        }
@@ -580,7 +580,7 @@ export default class ValidatorClient {

            // the function to calculate fee for a single entry is not exposed...
            console.log(`this.denom is ${this.denom}`);
-            const table = buildFeeTable(nymGasPrice(this.prefix), {sendMultiple: nymGasLimits.send * data.length}, {sendMultiple: nymGasLimits.send * data.length})
+            const table = buildFeeTable(nymGasPrice(this.prefix), { sendMultiple: nymGasLimits.send * data.length }, { sendMultiple: nymGasLimits.send * data.length })
            const fee = table.sendMultiple
            const result = await this.client.signAndBroadcast(senderAddress, encoded, fee, memo)
            if (isBroadcastTxFailure(result)) {
@@ -80,7 +80,7 @@ export default class NetClient implements INetClient {
    }

    public static async connect(wallet: DirectSecp256k1HdWallet, url: string, prefix: string): Promise<INetClient> {
-        const [{address}] = await wallet.getAccounts();
+        const [{ address }] = await wallet.getAccounts();
        const signerOptions: SigningCosmWasmClientOptions = {
            gasPrice: nymGasPrice(prefix),
            gasLimits: nymGasLimits,
@@ -95,17 +95,17 @@ export default class NetClient implements INetClient {

    public getMixNodes(contractAddress: string, limit: number, start_after?: string): Promise<PagedMixnodeResponse> {
        if (start_after == undefined) { // TODO: check if we can take this out, I'm not sure what will happen if we send an "undefined" so I'm playing it safe here.
-            return this.cosmClient.queryContractSmart(contractAddress, {get_mix_nodes: {limit}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_mix_nodes: { limit } });
        } else {
-            return this.cosmClient.queryContractSmart(contractAddress, {get_mix_nodes: {limit, start_after}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_mix_nodes: { limit, start_after } });
        }
    }

    public getGateways(contractAddress: string, limit: number, start_after?: string): Promise<PagedGatewayResponse> {
        if (start_after == undefined) { // TODO: check if we can take this out, I'm not sure what will happen if we send an "undefined" so I'm playing it safe here.
-            return this.cosmClient.queryContractSmart(contractAddress, {get_gateways: {limit}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_gateways: { limit } });
        } else {
-            return this.cosmClient.queryContractSmart(contractAddress, {get_gateways: {limit, start_after}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_gateways: { limit, start_after } });
        }
    }

@@ -166,11 +166,11 @@ export default class NetClient implements INetClient {
    }

    public ownsMixNode(contractAddress: string, address: string): Promise<MixOwnershipResponse> {
-        return this.cosmClient.queryContractSmart(contractAddress, {owns_mixnode: {address}});
+        return this.cosmClient.queryContractSmart(contractAddress, { owns_mixnode: { address } });
    }

    public ownsGateway(contractAddress: string, address: string): Promise<GatewayOwnershipResponse> {
-        return this.cosmClient.queryContractSmart(contractAddress, {owns_gateway: {address}});
+        return this.cosmClient.queryContractSmart(contractAddress, { owns_gateway: { address } });
    }

    public getBalance(address: string, denom: string): Promise<Coin | null> {
@@ -178,7 +178,7 @@ export default class NetClient implements INetClient {
    }

    public getStateParams(contractAddress: string): Promise<StateParams> {
-        return this.cosmClient.queryContractSmart(contractAddress, {state_params: {}});
+        return this.cosmClient.queryContractSmart(contractAddress, { contract_settings_params: {} });
    }

    public executeContract(senderAddress: string, contractAddress: string, handleMsg: Record<string, unknown>, memo?: string, transferAmount?: readonly Coin[]): Promise<ExecuteResult> {
@@ -6,7 +6,7 @@ import {
    MixOwnershipResponse, PagedGatewayDelegationsResponse,
    PagedGatewayResponse, PagedMixDelegationsResponse,
    PagedMixnodeResponse,
-    StateParams
+    ContractSettingsParams
 } from "./types";

 export interface IQueryClient {
@@ -28,7 +28,7 @@ export interface IQueryClient {

    ownsGateway(contractAddress: string, address: string): Promise<GatewayOwnershipResponse>;

-    getStateParams(contractAddress: string): Promise<StateParams>;
+    getStateParams(contractAddress: string): Promise<ContractSettingsParams>;

    changeValidator(newUrl: string): Promise<void>
 }
@@ -59,17 +59,17 @@ export default class QueryClient implements IQueryClient {

    public getMixNodes(contractAddress: string, limit: number, start_after?: string): Promise<PagedMixnodeResponse> {
        if (start_after == undefined) { // TODO: check if we can take this out, I'm not sure what will happen if we send an "undefined" so I'm playing it safe here.
-            return this.cosmClient.queryContractSmart(contractAddress, {get_mix_nodes: {limit}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_mix_nodes: { limit } });
        } else {
-            return this.cosmClient.queryContractSmart(contractAddress, {get_mix_nodes: {limit, start_after}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_mix_nodes: { limit, start_after } });
        }
    }

    public getGateways(contractAddress: string, limit: number, start_after?: string): Promise<PagedGatewayResponse> {
        if (start_after == undefined) { // TODO: check if we can take this out, I'm not sure what will happen if we send an "undefined" so I'm playing it safe here.
-            return this.cosmClient.queryContractSmart(contractAddress, {get_gateways: {limit}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_gateways: { limit } });
        } else {
-            return this.cosmClient.queryContractSmart(contractAddress, {get_gateways: {limit, start_after}});
+            return this.cosmClient.queryContractSmart(contractAddress, { get_gateways: { limit, start_after } });
        }
    }

@@ -130,18 +130,18 @@ export default class QueryClient implements IQueryClient {
    }

    public ownsMixNode(contractAddress: string, address: string): Promise<MixOwnershipResponse> {
-        return this.cosmClient.queryContractSmart(contractAddress, {owns_mixnode: {address}});
+        return this.cosmClient.queryContractSmart(contractAddress, { owns_mixnode: { address } });
    }

    public ownsGateway(contractAddress: string, address: string): Promise<GatewayOwnershipResponse> {
-        return this.cosmClient.queryContractSmart(contractAddress, {owns_gateway: {address}});
+        return this.cosmClient.queryContractSmart(contractAddress, { owns_gateway: { address } });
    }

    public getBalance(address: string, stakeDenom: string): Promise<Coin | null> {
        return this.cosmClient.getBalance(address, stakeDenom);
    }

-    public getStateParams(contractAddress: string): Promise<StateParams> {
-        return this.cosmClient.queryContractSmart(contractAddress, {state_params: {}});
+    public getStateParams(contractAddress: string): Promise<ContractSettingsParams> {
+        return this.cosmClient.queryContractSmart(contractAddress, { contract_settings_params: {} });
    }
 }
@@ -42,7 +42,7 @@ export type GatewayOwnershipResponse = {
    has_gateway: boolean,
 }

-export type StateParams = {
+export type ContractSettingsParams = {
    epoch_length: number,
    // ideally I'd want to define those as `number` rather than `string`, but
    // rust-side they are defined as Uint128 and Decimal that don't have
@@ -103,7 +103,7 @@ export type MixNode = {
 export type GatewayBond = {
    owner: string
    gateway: Gateway,
-    
+
    bond_amount: Coin,
    total_delegation: Coin,
 }
@@ -3,6 +3,7 @@

 use crypto::asymmetric::{encryption, identity};
 use futures::channel::mpsc;
+use gateway_client::bandwidth::BandwidthController;
 use gateway_client::GatewayClient;
 use nymsphinx::acknowledgements::AckKey;
 use nymsphinx::addressing::clients::Recipient;
@@ -17,8 +18,6 @@ use wasm_bindgen::prelude::*;
 use wasm_bindgen_futures::spawn_local;
 use wasm_utils::{console_log, console_warn};

-use gateway_client::bandwidth::BandwidthController;
-
 pub(crate) mod received_processor;

 const DEFAULT_AVERAGE_PACKET_DELAY: Duration = Duration::from_millis(200);
@@ -250,7 +249,7 @@ impl NymClient {
        let validator_client = validator_client::ApiClient::new(self.validator_server.clone());

        let mixnodes = match validator_client.get_cached_active_mixnodes().await {
-            Err(err) => panic!("{}", err),
+            Err(err) => panic!("{:?}", err),
            Ok(mixes) => mixes,
        };

@@ -1,10 +1,11 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use crate::error::GatewayClientError;
 #[cfg(feature = "coconut")]
 use credentials::coconut::{
-    bandwidth::{obtain_signature, prepare_for_spending},
+    bandwidth::{
+        obtain_signature, prepare_for_spending, BandwidthVoucherAttributes, TOTAL_ATTRIBUTES,
+    },
    utils::obtain_aggregate_verification_key,
 };
 #[cfg(not(feature = "coconut"))]
@@ -12,10 +13,11 @@ use credentials::token::bandwidth::TokenCredential;
 #[cfg(not(feature = "coconut"))]
 use crypto::asymmetric::identity;
 use crypto::asymmetric::identity::PublicKey;
+use network_defaults::BANDWIDTH_VALUE;
 #[cfg(not(feature = "coconut"))]
 use network_defaults::{
-    eth_contract::ETH_JSON_ABI, BANDWIDTH_VALUE, ETH_BURN_FUNCTION_NAME, ETH_CONTRACT_ADDRESS,
-    ETH_MIN_BLOCK_DEPTH, TOKENS_TO_BURN,
+    eth_contract::ETH_JSON_ABI, ETH_BURN_FUNCTION_NAME, ETH_CONTRACT_ADDRESS, ETH_MIN_BLOCK_DEPTH,
+    TOKENS_TO_BURN,
 };
 #[cfg(not(feature = "coconut"))]
 use rand::rngs::OsRng;
@@ -33,6 +35,8 @@ use web3::{
    Web3,
 };

+use crate::error::GatewayClientError;
+
 #[cfg(not(feature = "coconut"))]
 pub fn eth_contract(web3: Web3<Http>) -> Contract<Http> {
    Contract::from_json(
@@ -108,15 +112,31 @@ impl BandwidthController {
        &self,
    ) -> Result<coconut_interface::Credential, GatewayClientError> {
        let verification_key = obtain_aggregate_verification_key(&self.validator_endpoints).await?;
+        let params = coconut_interface::Parameters::new(TOTAL_ATTRIBUTES).unwrap();

-        let bandwidth_credential =
-            obtain_signature(&self.identity.to_bytes(), &self.validator_endpoints).await?;
+        // TODO: Decide what is the value and additional info associated with the bandwidth voucher
+        let bandwidth_credential_attributes = BandwidthVoucherAttributes {
+            serial_number: params.random_scalar(),
+            binding_number: params.random_scalar(),
+            voucher_value: coconut_interface::hash_to_scalar(BANDWIDTH_VALUE.to_be_bytes()),
+            voucher_info: coconut_interface::hash_to_scalar(
+                String::from("BandwidthVoucher").as_bytes(),
+            ),
+        };
+
+        let bandwidth_credential = obtain_signature(
+            &params,
+            &bandwidth_credential_attributes,
+            &self.validator_endpoints,
+        )
+        .await?;
        // the above would presumably be loaded from a file

        // the below would only be executed once we know where we want to spend it (i.e. which gateway and stuff)
        Ok(prepare_for_spending(
            &self.identity.to_bytes(),
            &bandwidth_credential,
+            &bandwidth_credential_attributes,
            &verification_key,
        )?)
    }
@@ -203,9 +223,10 @@ impl BandwidthController {
 #[cfg(not(feature = "coconut"))]
 #[cfg(test)]
 mod tests {
-    use super::*;
    use network_defaults::ETH_EVENT_NAME;

+    use super::*;
+
    #[test]
    fn parse_contract() {
        let transport =
@@ -10,6 +10,7 @@ rust-version = "1.56"
 [dependencies]
 base64 = "0.13"
 mixnet-contract = { path="../../../common/mixnet-contract" }
+vesting-contract = { path="../../../contracts/vesting" }
 serde = { version="1", features=["derive"] }
 serde_json = "1"
 reqwest = { version="0.11", features=["json"] }
@@ -26,12 +27,13 @@ network-defaults = { path = "../../network-defaults" }
 async-trait = { version = "0.1.51", optional = true }
 bip39 = { version = "1", features = ["rand"], optional = true }
 config = { path = "../../config", optional = true }
-cosmrs = { version = "0.3", features = ["rpc", "bip32", "cosmwasm"], optional = true }
+#cosmrs = { version = "0.3", features = ["rpc", "bip32", "cosmwasm"], optional = true }
+cosmrs = { git = "https://github.com/cosmos/cosmos-rust", rev="e5a1872083abb3d88fa62dda966e7f5408deba58", features = ["rpc", "bip32", "cosmwasm"], optional = true }
 prost = { version = "0.9", default-features = false, optional = true }
 flate2 = { version = "1.0.20", optional = true }
 sha2 = { version = "0.9.5", optional = true }
 itertools = { version = "0.10", optional = true }
-cosmwasm-std = { git = "https://github.com/jstuczyn/cosmwasm", branch="0.14.1-updatedk256", optional = true }
+cosmwasm-std = { version = "1.0.0-beta2", optional = true }
 ts-rs = {version = "5.1", optional = true}

 [features]
@@ -6,13 +6,18 @@ use crate::nymd::{
    error::NymdError, CosmWasmClient, NymdClient, QueryNymdClient, SigningNymdClient,
 };
 #[cfg(feature = "nymd-client")]
-use mixnet_contract::StateParams;
+use mixnet_contract::ContractStateParams;

 use crate::{validator_api, ValidatorClientError};
 use coconut_interface::{BlindSignRequestBody, BlindedSignatureResponse, VerificationKeyResponse};
-use mixnet_contract::{GatewayBond, MixNodeBond};
 #[cfg(feature = "nymd-client")]
-use mixnet_contract::{RawDelegationData, RewardingIntervalResponse};
+use mixnet_contract::{
+    Delegation, MixnetContractVersion, MixnodeRewardingStatusResponse, RewardingIntervalResponse,
+};
+use mixnet_contract::{GatewayBond, MixNodeBond};
+
+#[cfg(feature = "nymd-client")]
+use std::str::FromStr;
 use url::Url;

 #[cfg(feature = "nymd-client")]
@@ -20,6 +25,7 @@ pub struct Config {
    api_url: Url,
    nymd_url: Url,
    mixnet_contract_address: Option<cosmrs::AccountId>,
+    vesting_contract_address: Option<cosmrs::AccountId>,

    mixnode_page_limit: Option<u32>,
    gateway_page_limit: Option<u32>,
@@ -32,10 +38,12 @@ impl Config {
        nymd_url: Url,
        api_url: Url,
        mixnet_contract_address: Option<cosmrs::AccountId>,
+        vesting_contract_address: Option<cosmrs::AccountId>,
    ) -> Self {
        Config {
            nymd_url,
            mixnet_contract_address,
+            vesting_contract_address,
            api_url,
            mixnode_page_limit: None,
            gateway_page_limit: None,
@@ -62,6 +70,7 @@ impl Config {
 #[cfg(feature = "nymd-client")]
 pub struct Client<C> {
    mixnet_contract_address: Option<cosmrs::AccountId>,
+    vesting_contract_address: Option<cosmrs::AccountId>,
    mnemonic: Option<bip39::Mnemonic>,

    mixnode_page_limit: Option<u32>,
@@ -83,11 +92,14 @@ impl Client<SigningNymdClient> {
        let nymd_client = NymdClient::connect_with_mnemonic(
            config.nymd_url.as_str(),
            config.mixnet_contract_address.clone(),
+            config.vesting_contract_address.clone(),
            mnemonic.clone(),
+            None,
        )?;

        Ok(Client {
            mixnet_contract_address: config.mixnet_contract_address,
+            vesting_contract_address: config.vesting_contract_address,
            mnemonic: Some(mnemonic),
            mixnode_page_limit: config.mixnode_page_limit,
            gateway_page_limit: config.gateway_page_limit,
@@ -101,7 +113,9 @@ impl Client<SigningNymdClient> {
        self.nymd = NymdClient::connect_with_mnemonic(
            new_endpoint.as_ref(),
            self.mixnet_contract_address.clone(),
+            self.vesting_contract_address.clone(),
            self.mnemonic.clone().unwrap(),
+            None,
        )?;
        Ok(())
    }
@@ -113,16 +127,19 @@ impl Client<QueryNymdClient> {
        let validator_api_client = validator_api::Client::new(config.api_url.clone());
        let nymd_client = NymdClient::connect(
            config.nymd_url.as_str(),
-            config
-                .mixnet_contract_address
-                .clone()
-                .ok_or(ValidatorClientError::NymdError(
-                    NymdError::NoContractAddressAvailable,
-                ))?,
+            config.mixnet_contract_address.clone().unwrap_or_else(|| {
+                cosmrs::AccountId::from_str(network_defaults::DEFAULT_MIXNET_CONTRACT_ADDRESS)
+                    .unwrap()
+            }),
+            config.vesting_contract_address.clone().unwrap_or_else(|| {
+                cosmrs::AccountId::from_str(network_defaults::DEFAULT_VESTING_CONTRACT_ADDRESS)
+                    .unwrap()
+            }),
        )?;

        Ok(Client {
            mixnet_contract_address: config.mixnet_contract_address,
+            vesting_contract_address: config.vesting_contract_address,
            mnemonic: None,
            mixnode_page_limit: config.mixnode_page_limit,
            gateway_page_limit: config.gateway_page_limit,
@@ -136,6 +153,7 @@ impl Client<QueryNymdClient> {
        self.nymd = NymdClient::connect(
            new_endpoint.as_ref(),
            self.mixnet_contract_address.clone().unwrap(),
+            self.vesting_contract_address.clone().unwrap(),
        )?;
        Ok(())
    }
@@ -165,11 +183,18 @@ impl<C> Client<C> {
        Ok(self.validator_api.get_gateways().await?)
    }

-    pub async fn get_state_params(&self) -> Result<StateParams, ValidatorClientError>
+    pub async fn get_contract_settings(&self) -> Result<ContractStateParams, ValidatorClientError>
    where
        C: CosmWasmClient + Sync,
    {
-        Ok(self.nymd.get_state_params().await?)
+        Ok(self.nymd.get_contract_settings().await?)
+    }
+
+    pub async fn get_mixnet_contract_version(&self) -> Result<MixnetContractVersion, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        Ok(self.nymd.get_mixnet_contract_version().await?)
    }

    pub async fn get_current_rewarding_interval(
@@ -181,6 +206,20 @@ impl<C> Client<C> {
        Ok(self.nymd.get_current_rewarding_interval().await?)
    }

+    pub async fn get_rewarding_status(
+        &self,
+        mix_identity: mixnet_contract::IdentityKey,
+        rewarding_interval_nonce: u32,
+    ) -> Result<MixnodeRewardingStatusResponse, ValidatorClientError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        Ok(self
+            .nymd
+            .get_rewarding_status(mix_identity, rewarding_interval_nonce)
+            .await?)
+    }
+
    pub async fn get_reward_pool(&self) -> Result<u128, ValidatorClientError>
    where
        C: CosmWasmClient + Sync,
@@ -286,9 +325,7 @@ impl<C> Client<C> {
        Ok(delegations)
    }

-    pub async fn get_all_nymd_mixnode_delegations(
-        &self,
-    ) -> Result<Vec<mixnet_contract::UnpackedDelegation<RawDelegationData>>, ValidatorClientError>
+    pub async fn get_all_network_delegations(&self) -> Result<Vec<Delegation>, ValidatorClientError>
    where
        C: CosmWasmClient + Sync,
    {
@@ -297,7 +334,7 @@ impl<C> Client<C> {
        loop {
            let mut paged_response = self
                .nymd
-                .get_all_mix_delegations_paged(
+                .get_all_network_delegations_paged(
                    start_after.take(),
                    self.mixnode_delegations_page_limit,
                )
@@ -314,10 +351,10 @@ impl<C> Client<C> {
        Ok(delegations)
    }

-    pub async fn get_all_nymd_reverse_mixnode_delegations(
+    pub async fn get_all_delegator_delegations(
        &self,
        delegation_owner: &cosmrs::AccountId,
-    ) -> Result<Vec<mixnet_contract::IdentityKey>, ValidatorClientError>
+    ) -> Result<Vec<Delegation>, ValidatorClientError>
    where
        C: CosmWasmClient + Sync,
    {
@@ -326,13 +363,13 @@ impl<C> Client<C> {
        loop {
            let mut paged_response = self
                .nymd
-                .get_reverse_mix_delegations_paged(
-                    mixnet_contract::Addr::unchecked(delegation_owner.as_ref()),
+                .get_delegator_delegations_paged(
+                    delegation_owner.to_string(),
                    start_after.take(),
                    self.mixnode_delegations_page_limit,
                )
                .await?;
-            delegations.append(&mut paged_response.delegated_nodes);
+            delegations.append(&mut paged_response.delegations);

            if let Some(start_after_res) = paged_response.start_next_after {
                start_after = Some(start_after_res)
@@ -344,28 +381,6 @@ impl<C> Client<C> {
        Ok(delegations)
    }

-    pub async fn get_all_nymd_mixnode_delegations_of_owner(
-        &self,
-        delegation_owner: &cosmrs::AccountId,
-    ) -> Result<Vec<mixnet_contract::Delegation>, ValidatorClientError>
-    where
-        C: CosmWasmClient + Sync,
-    {
-        let mut delegations = Vec::new();
-        for node_identity in self
-            .get_all_nymd_reverse_mixnode_delegations(delegation_owner)
-            .await?
-        {
-            let delegation = self
-                .nymd
-                .get_mix_delegation(node_identity, delegation_owner)
-                .await?;
-            delegations.push(delegation);
-        }
-
-        Ok(delegations)
-    }
-
    pub async fn blind_sign(
        &self,
        request_body: &BlindSignRequestBody,
@@ -4,7 +4,7 @@
 use crate::nymd::cosmwasm_client::helpers::create_pagination;
 use crate::nymd::cosmwasm_client::types::{
    Account, Code, CodeDetails, Contract, ContractCodeHistoryEntry, ContractCodeId,
-    SequenceResponse,
+    SequenceResponse, SimulateResponse,
 };
 use crate::nymd::error::NymdError;
 use async_trait::async_trait;
@@ -14,15 +14,19 @@ use cosmrs::proto::cosmos::auth::v1beta1::{
 use cosmrs::proto::cosmos::bank::v1beta1::{
    QueryAllBalancesRequest, QueryAllBalancesResponse, QueryBalanceRequest, QueryBalanceResponse,
 };
-use cosmrs::proto::cosmwasm::wasm::v1beta1::*;
+use cosmrs::proto::cosmos::tx::v1beta1::{
+    SimulateRequest, SimulateResponse as ProtoSimulateResponse,
+};
+use cosmrs::proto::cosmwasm::wasm::v1::*;
 use cosmrs::rpc::endpoint::block::Response as BlockResponse;
 use cosmrs::rpc::endpoint::broadcast;
 use cosmrs::rpc::endpoint::tx::Response as TxResponse;
 use cosmrs::rpc::query::Query;
 use cosmrs::rpc::{self, HttpClient, Order};
+use cosmrs::tendermint::abci::Code as AbciCode;
 use cosmrs::tendermint::abci::Transaction;
 use cosmrs::tendermint::{abci, block, chain};
-use cosmrs::{tx, AccountId, Coin, Denom};
+use cosmrs::{tx, AccountId, Coin, Denom, Tx};
 use prost::Message;
 use serde::{Deserialize, Serialize};
 use std::convert::{TryFrom, TryInto};
@@ -49,6 +53,11 @@ pub trait CosmWasmClient: rpc::Client {

        let res = self.abci_query(path, buf, None, false).await?;

+        match res.code {
+            AbciCode::Err(code) => return Err(NymdError::AbciError(code, res.log)),
+            AbciCode::Ok => (),
+        }
+
        Ok(Res::decode(res.value.as_ref())?)
    }

@@ -213,7 +222,7 @@ pub trait CosmWasmClient: rpc::Client {
    }

    async fn get_codes(&self) -> Result<Vec<Code>, NymdError> {
-        let path = Some("/cosmwasm.wasm.v1beta1.Query/Codes".parse().unwrap());
+        let path = Some("/cosmwasm.wasm.v1.Query/Codes".parse().unwrap());

        let mut raw_codes = Vec::new();
        let mut pagination = None;
@@ -240,7 +249,7 @@ pub trait CosmWasmClient: rpc::Client {
    }

    async fn get_code_details(&self, code_id: ContractCodeId) -> Result<CodeDetails, NymdError> {
-        let path = Some("/cosmwasm.wasm.v1beta1.Query/Code".parse().unwrap());
+        let path = Some("/cosmwasm.wasm.v1.Query/Code".parse().unwrap());

        let req = QueryCodeRequest { code_id };

@@ -255,11 +264,7 @@ pub trait CosmWasmClient: rpc::Client {
        }
    }
    async fn get_contracts(&self, code_id: ContractCodeId) -> Result<Vec<AccountId>, NymdError> {
-        let path = Some(
-            "/cosmwasm.wasm.v1beta1.Query/ContractsByCode"
-                .parse()
-                .unwrap(),
-        );
+        let path = Some("/cosmwasm.wasm.v1.Query/ContractsByCode".parse().unwrap());

        let mut raw_contracts = Vec::new();
        let mut pagination = None;
@@ -290,7 +295,7 @@ pub trait CosmWasmClient: rpc::Client {
    }

    async fn get_contract(&self, address: &AccountId) -> Result<Contract, NymdError> {
-        let path = Some("/cosmwasm.wasm.v1beta1.Query/ContractInfo".parse().unwrap());
+        let path = Some("/cosmwasm.wasm.v1.Query/ContractInfo".parse().unwrap());

        let req = QueryContractInfoRequest {
            address: address.to_string(),
@@ -315,11 +320,7 @@ pub trait CosmWasmClient: rpc::Client {
        &self,
        address: &AccountId,
    ) -> Result<Vec<ContractCodeHistoryEntry>, NymdError> {
-        let path = Some(
-            "/cosmwasm.wasm.v1beta1.Query/ContractHistory"
-                .parse()
-                .unwrap(),
-        );
+        let path = Some("/cosmwasm.wasm.v1.Query/ContractHistory".parse().unwrap());

        let mut raw_entries = Vec::new();
        let mut pagination = None;
@@ -353,11 +354,7 @@ pub trait CosmWasmClient: rpc::Client {
        address: &AccountId,
        query_data: Vec<u8>,
    ) -> Result<Vec<u8>, NymdError> {
-        let path = Some(
-            "/cosmwasm.wasm.v1beta1.Query/RawContractState"
-                .parse()
-                .unwrap(),
-        );
+        let path = Some("/cosmwasm.wasm.v1.Query/RawContractState".parse().unwrap());

        let req = QueryRawContractStateRequest {
            address: address.to_string(),
@@ -381,7 +378,7 @@ pub trait CosmWasmClient: rpc::Client {
        for<'a> T: Deserialize<'a>,
    {
        let path = Some(
-            "/cosmwasm.wasm.v1beta1.Query/SmartContractState"
+            "/cosmwasm.wasm.v1.Query/SmartContractState"
                .parse()
                .unwrap(),
        );
@@ -400,4 +397,27 @@ pub trait CosmWasmClient: rpc::Client {

        Ok(serde_json::from_slice(&res.data)?)
    }
+
+    // deprecation warning is due to the fact the protobuf files built were based on cosmos-sdk 0.44,
+    // where they prefer using tx_bytes directly. However, in 0.42, which we are using at the time
+    // of writing this, the option does not work
+    #[allow(deprecated)]
+    async fn query_simulate(
+        &self,
+        tx: Option<Tx>,
+        tx_bytes: Vec<u8>,
+    ) -> Result<SimulateResponse, NymdError> {
+        let path = Some("/cosmos.tx.v1beta1.Service/Simulate".parse().unwrap());
+
+        let req = SimulateRequest {
+            tx: tx.map(Into::into),
+            tx_bytes,
+        };
+
+        let res = self
+            .make_abci_query::<_, ProtoSimulateResponse>(path, req)
+            .await?;
+
+        res.try_into()
+    }
 }
@@ -29,7 +29,7 @@ pub(crate) fn find_attribute<'a>(
 ) -> Option<&'a cosmwasm_std::Attribute> {
    logs.iter()
        .flat_map(|log| log.events.iter())
-        .find(|event| event.kind == event_type)?
+        .find(|event| event.ty == event_type)?
        .attributes
        .iter()
        .find(|attr| attr.key == attribute_key)
@@ -61,7 +61,7 @@ mod tests {
        assert_eq!(parsed.len(), 1);
        assert_eq!(parsed[0].msg_index, 0);
        assert_eq!(parsed[0].events.len(), 1);
-        assert_eq!(parsed[0].events[0].kind, "message");
+        assert_eq!(parsed[0].events[0].ty, "message");
        assert_eq!(parsed[0].events[0].attributes[3].key, "code_id");
        assert_eq!(parsed[0].events[0].attributes[3].value, "1");
    }
@@ -76,12 +76,12 @@ mod tests {
        assert_eq!(parsed[2].msg_index, 2);

        assert_eq!(parsed[0].events.len(), 1);
-        assert_eq!(parsed[0].events[0].kind, "message");
+        assert_eq!(parsed[0].events[0].ty, "message");
        assert_eq!(parsed[0].events[0].attributes[3].key, "code_id");
        assert_eq!(parsed[0].events[0].attributes[3].value, "9");

        assert_eq!(parsed[2].events.len(), 1);
-        assert_eq!(parsed[2].events[0].kind, "message");
+        assert_eq!(parsed[2].events[0].ty, "message");
        assert_eq!(parsed[2].events[0].attributes[2].key, "signer");
        assert_eq!(
            parsed[2].events[0].attributes[2].value,
@@ -3,6 +3,7 @@

 use crate::nymd::error::NymdError;
 use crate::nymd::wallet::DirectSecp256k1HdWallet;
+use crate::nymd::GasPrice;
 use cosmrs::rpc::{Error as TendermintRpcError, HttpClient, HttpClientUrl};
 use std::convert::TryInto;

@@ -23,9 +24,10 @@ where
 pub fn connect_with_signer<U>(
    endpoint: U,
    signer: DirectSecp256k1HdWallet,
+    gas_price: Option<GasPrice>,
 ) -> Result<signing_client::Client, NymdError>
 where
    U: TryInto<HttpClientUrl, Error = TendermintRpcError>,
 {
-    signing_client::Client::connect_with_signer(endpoint, signer)
+    signing_client::Client::connect_with_signer(endpoint, signer, gas_price)
 }
@@ -1,37 +1,100 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

+use std::convert::TryInto;
+
+use async_trait::async_trait;
+use cosmrs::bank::MsgSend;
+use cosmrs::distribution::MsgWithdrawDelegatorReward;
+use cosmrs::proto::cosmos::tx::signing::v1beta1::SignMode;
+use cosmrs::rpc::endpoint::broadcast;
+use cosmrs::rpc::{Error as TendermintRpcError, HttpClient, HttpClientUrl, SimpleRequest};
+use cosmrs::staking::{MsgDelegate, MsgUndelegate};
+use cosmrs::tx::{self, Msg, SignDoc, SignerInfo};
+use cosmrs::{cosmwasm, rpc, AccountId, Any, Coin, Tx};
+use log::debug;
+use serde::Serialize;
+use sha2::Digest;
+use sha2::Sha256;
+
 use crate::nymd::cosmwasm_client::client::CosmWasmClient;
 use crate::nymd::cosmwasm_client::helpers::{compress_wasm_code, CheckResponse};
 use crate::nymd::cosmwasm_client::logs::{self, parse_raw_logs};
 use crate::nymd::cosmwasm_client::types::*;
 use crate::nymd::error::NymdError;
+use crate::nymd::fee::{Fee, DEFAULT_SIMULATED_GAS_MULTIPLIER};
 use crate::nymd::wallet::DirectSecp256k1HdWallet;
-use async_trait::async_trait;
-use cosmrs::bank::MsgSend;
-use cosmrs::distribution::MsgWithdrawDelegatorReward;
-use cosmrs::rpc::endpoint::broadcast;
-use cosmrs::rpc::{Error as TendermintRpcError, HttpClient, HttpClientUrl, SimpleRequest};
-use cosmrs::staking::{MsgDelegate, MsgUndelegate};
-use cosmrs::tx::{Fee, Msg, SignDoc, SignerInfo};
-use cosmrs::{cosmwasm, rpc, tx, AccountId, Any, Coin};
-use log::debug;
-use serde::Serialize;
-use sha2::Digest;
-use sha2::Sha256;
-use std::convert::TryInto;
+use crate::nymd::{CosmosCoin, GasPrice};
+
+// we need to have **a** valid secp256k1 signature for simulation purposes.
+// it doesn't matter what it is as long as it parses correctly
+const DUMMY_SECP256K1_SIGNATURE: &[u8] = &[
+    54, 167, 169, 61, 100, 173, 231, 87, 1, 113, 179, 49, 102, 141, 67, 22, 170, 153, 52, 88, 178,
+    159, 200, 11, 37, 138, 76, 221, 187, 70, 104, 123, 98, 216, 190, 249, 149, 81, 1, 158, 0, 220,
+    32, 147, 101, 60, 64, 77, 44, 83, 221, 119, 170, 124, 109, 177, 73, 116, 46, 57, 102, 181, 98,
+    91,
+];

 #[async_trait]
 pub trait SigningCosmWasmClient: CosmWasmClient {
    fn signer(&self) -> &DirectSecp256k1HdWallet;

+    fn gas_price(&self) -> &GasPrice;
+
+    fn signer_public_key(&self, signer_address: &AccountId) -> Option<tx::SignerPublicKey> {
+        let signer_accounts = self.signer().try_derive_accounts().ok()?;
+        let account_from_signer = signer_accounts
+            .iter()
+            .find(|account| &account.address == signer_address)?;
+        let public_key = account_from_signer.public_key;
+        Some(public_key.into())
+    }
+
+    async fn simulate(
+        &self,
+        signer_address: &AccountId,
+        messages: Vec<Any>,
+        memo: impl Into<String> + Send + 'static,
+    ) -> Result<SimulateResponse, NymdError> {
+        let public_key = self.signer_public_key(signer_address);
+        let sequence_response = self.get_sequence(signer_address).await?;
+
+        let partial_tx = Tx {
+            body: tx::Body {
+                messages,
+                memo: memo.into(),
+                timeout_height: 0u32.into(),
+                extension_options: vec![],
+                non_critical_extension_options: vec![],
+            },
+            auth_info: tx::AuthInfo {
+                signer_infos: vec![tx::SignerInfo {
+                    public_key,
+                    mode_info: tx::ModeInfo::Single(tx::mode_info::Single {
+                        mode: SignMode::Unspecified,
+                    }),
+                    sequence: sequence_response.sequence,
+                }],
+                fee: tx::Fee::from_amount_and_gas(
+                    CosmosCoin {
+                        denom: "".parse().unwrap(),
+                        amount: 0u64.into(),
+                    },
+                    0,
+                ),
+            },
+            signatures: vec![DUMMY_SECP256K1_SIGNATURE.try_into().unwrap()],
+        };
+
+        self.query_simulate(Some(partial_tx), Vec::new()).await
+    }
+
    async fn upload(
        &self,
        sender_address: &AccountId,
        wasm_code: Vec<u8>,
        fee: Fee,
        memo: impl Into<String> + Send + 'static,
-        mut meta: Option<UploadMeta>,
    ) -> Result<UploadResult, NymdError> {
        let compressed = compress_wasm_code(&wasm_code)?;
        let compressed_size = compressed.len();
@@ -42,14 +105,6 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        let upload_msg = cosmwasm::MsgStoreCode {
            sender: sender_address.clone(),
            wasm_byte_code: compressed,
-            source: meta
-                .as_mut()
-                .map(|meta| meta.source.take())
-                .unwrap_or_default(),
-            builder: meta
-                .as_mut()
-                .map(|meta| meta.builder.take())
-                .unwrap_or_default(),
            instantiate_permission: Default::default(),
        }
        .to_any()
@@ -61,12 +116,13 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            .check_response()?;

        let logs = parse_raw_logs(tx_res.deliver_tx.log)?;
+        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);

        // TODO: should those strings be extracted into some constants?
        // the reason I think unwrap here is fine is that if the transaction succeeded and those
        // fields do not exist or code_id is not a number, there's no way we can recover, we're probably connected
        // to wrong validator or something
-        let code_id = logs::find_attribute(&logs, "message", "code_id")
+        let code_id = logs::find_attribute(&logs, "store_code", "code_id")
            .unwrap()
            .value
            .parse()
@@ -80,6 +136,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            code_id,
            logs,
            transaction_hash: tx_res.hash,
+            gas_info,
        })
    }

@@ -111,7 +168,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            // now this is a weird one. the protobuf files say this field is optional,
            // but if you omit it, the initialisation will fail CheckTx
            label: Some(label),
-            init_msg: serde_json::to_vec(msg)?,
+            msg: serde_json::to_vec(msg)?,
            funds: options.map(|options| options.funds).unwrap_or_default(),
        }
        .to_any()
@@ -123,12 +180,13 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            .check_response()?;

        let logs = parse_raw_logs(tx_res.deliver_tx.log)?;
+        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);

        // TODO: should those strings be extracted into some constants?
        // the reason I think unwrap here is fine is that if the transaction succeeded and those
        // fields do not exist or address is malformed, there's no way we can recover, we're probably connected
        // to wrong validator or something
-        let contract_address = logs::find_attribute(&logs, "message", "contract_address")
+        let contract_address = logs::find_attribute(&logs, "instantiate", "_contract_address")
            .unwrap()
            .value
            .parse()
@@ -138,6 +196,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            contract_address,
            logs,
            transaction_hash: tx_res.hash,
+            gas_info,
        })
    }

@@ -162,9 +221,12 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            .await?
            .check_response()?;

+        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+
        Ok(ChangeAdminResult {
            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
            transaction_hash: tx_res.hash,
+            gas_info,
        })
    }

@@ -187,9 +249,12 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            .await?
            .check_response()?;

+        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+
        Ok(ChangeAdminResult {
            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
            transaction_hash: tx_res.hash,
+            gas_info,
        })
    }

@@ -209,7 +274,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            sender: sender_address.clone(),
            contract: contract_address.clone(),
            code_id,
-            migrate_msg: serde_json::to_vec(msg)?,
+            msg: serde_json::to_vec(msg)?,
        }
        .to_any()
        .map_err(|_| NymdError::SerializationError("MsgMigrateContract".to_owned()))?;
@@ -219,9 +284,12 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            .await?
            .check_response()?;

+        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+
        Ok(MigrateResult {
            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
            transaction_hash: tx_res.hash,
+            gas_info,
        })
    }

@@ -251,9 +319,12 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            .await?
            .check_response()?;

+        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);
+
        Ok(ExecuteResult {
            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
            transaction_hash: tx_res.hash,
+            gas_info,
        })
    }

@@ -288,14 +359,12 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
            .await?
            .check_response()?;

-        debug!(
-            "gas wanted: {:?}, gas used: {:?}",
-            tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used
-        );
+        let gas_info = GasInfo::new(tx_res.deliver_tx.gas_wanted, tx_res.deliver_tx.gas_used);

        Ok(ExecuteResult {
            logs: parse_raw_logs(tx_res.deliver_tx.log)?,
            transaction_hash: tx_res.hash,
+            gas_info,
        })
    }

@@ -316,7 +385,36 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        .map_err(|_| NymdError::SerializationError("MsgSend".to_owned()))?;

        self.sign_and_broadcast_commit(sender_address, vec![send_msg], fee, memo)
-            .await
+            .await?
+            .check_response()
+    }
+
+    async fn send_tokens_multiple<I>(
+        &self,
+        sender_address: &AccountId,
+        msgs: I,
+        fee: Fee,
+        memo: impl Into<String> + Send + 'static,
+    ) -> Result<broadcast::tx_commit::Response, NymdError>
+    where
+        I: IntoIterator<Item = (AccountId, Vec<Coin>)> + Send,
+    {
+        let messages = msgs
+            .into_iter()
+            .map(|(to_address, amount)| {
+                MsgSend {
+                    from_address: sender_address.clone(),
+                    to_address,
+                    amount,
+                }
+                .to_any()
+                .map_err(|_| NymdError::SerializationError("MsgExecuteContract".to_owned()))
+            })
+            .collect::<Result<_, _>>()?;
+
+        self.sign_and_broadcast_commit(sender_address, messages, fee, memo)
+            .await?
+            .check_response()
    }

    async fn delegate_tokens(
@@ -336,7 +434,8 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        .map_err(|_| NymdError::SerializationError("MsgDelegate".to_owned()))?;

        self.sign_and_broadcast_commit(delegator_address, vec![delegate_msg], fee, memo)
-            .await
+            .await?
+            .check_response()
    }

    async fn undelegate_tokens(
@@ -356,7 +455,8 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        .map_err(|_| NymdError::SerializationError("MsgUndelegate".to_owned()))?;

        self.sign_and_broadcast_commit(delegator_address, vec![undelegate_msg], fee, memo)
-            .await
+            .await?
+            .check_response()
    }

    async fn withdraw_rewards(
@@ -374,7 +474,45 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        .map_err(|_| NymdError::SerializationError("MsgWithdrawDelegatorReward".to_owned()))?;

        self.sign_and_broadcast_commit(delegator_address, vec![withdraw_msg], fee, memo)
-            .await
+            .await?
+            .check_response()
+    }
+
+    // in this particular case we cannot generalise the argument to `&str` due to lifetime constraints
+    #[allow(clippy::ptr_arg)]
+    async fn determine_transaction_fee(
+        &self,
+        signer_address: &AccountId,
+        messages: &[Any],
+        fee: Fee,
+        memo: &String,
+    ) -> Result<tx::Fee, NymdError> {
+        let fee = match fee {
+            Fee::Manual(fee) => fee,
+            Fee::Auto(multiplier) => {
+                debug!("Trying to simulate gas costs...");
+                // from what I've seen in manual testing, gas estimation does not exist if transaction
+                // fails to get executed (for example if you send 'BondMixnode" with invalid signature)
+                let gas_estimation = self
+                    .simulate(signer_address, messages.to_vec(), memo.clone())
+                    .await?
+                    .gas_info
+                    .ok_or(NymdError::GasEstimationFailure)?
+                    .gas_used;
+
+                let multiplier = multiplier.unwrap_or(DEFAULT_SIMULATED_GAS_MULTIPLIER);
+                let gas = ((gas_estimation.value() as f32 * multiplier) as u64).into();
+
+                debug!("Gas estimation: {}", gas_estimation);
+                debug!("Multiplying the estimation by {}", multiplier);
+                debug!("Final gas limit used: {}", gas);
+
+                let fee = self.gas_price() * gas;
+                tx::Fee::from_amount_and_gas(fee, gas)
+            }
+        };
+        debug!("Fee used for the transaction: {:?}", fee);
+        Ok(fee)
    }

    /// Broadcast a transaction, returning immediately.
@@ -385,6 +523,10 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        fee: Fee,
        memo: impl Into<String> + Send + 'static,
    ) -> Result<broadcast::tx_async::Response, NymdError> {
+        let memo = memo.into();
+        let fee = self
+            .determine_transaction_fee(signer_address, &messages, fee, &memo)
+            .await?;
        let tx_raw = self.sign(signer_address, messages, fee, memo).await?;
        let tx_bytes = tx_raw
            .to_bytes()
@@ -401,6 +543,10 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        fee: Fee,
        memo: impl Into<String> + Send + 'static,
    ) -> Result<broadcast::tx_sync::Response, NymdError> {
+        let memo = memo.into();
+        let fee = self
+            .determine_transaction_fee(signer_address, &messages, fee, &memo)
+            .await?;
        let tx_raw = self.sign(signer_address, messages, fee, memo).await?;
        let tx_bytes = tx_raw
            .to_bytes()
@@ -417,6 +563,11 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        fee: Fee,
        memo: impl Into<String> + Send + 'static,
    ) -> Result<broadcast::tx_commit::Response, NymdError> {
+        let memo = memo.into();
+        let fee = self
+            .determine_transaction_fee(signer_address, &messages, fee, &memo)
+            .await?;
+
        let tx_raw = self.sign(signer_address, messages, fee, memo).await?;
        let tx_bytes = tx_raw
            .to_bytes()
@@ -429,7 +580,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        &self,
        signer_address: &AccountId,
        messages: Vec<Any>,
-        fee: Fee,
+        fee: tx::Fee,
        memo: impl Into<String> + Send + 'static,
        signer_data: SignerData,
    ) -> Result<tx::Raw, NymdError> {
@@ -467,7 +618,7 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
        &self,
        signer_address: &AccountId,
        messages: Vec<Any>,
-        fee: Fee,
+        fee: tx::Fee,
        memo: impl Into<String> + Send + 'static,
    ) -> Result<tx::Raw, NymdError> {
        // TODO: Future optimisation: rather than grabbing current account_number and sequence
@@ -485,22 +636,28 @@ pub trait SigningCosmWasmClient: CosmWasmClient {
    }
 }

-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct Client {
    rpc_client: HttpClient,
    signer: DirectSecp256k1HdWallet,
+    gas_price: GasPrice,
 }

 impl Client {
    pub fn connect_with_signer<U>(
        endpoint: U,
        signer: DirectSecp256k1HdWallet,
+        gas_price: Option<GasPrice>,
    ) -> Result<Self, NymdError>
    where
        U: TryInto<HttpClientUrl, Error = TendermintRpcError>,
    {
        let rpc_client = HttpClient::new(endpoint)?;
-        Ok(Client { rpc_client, signer })
+        Ok(Client {
+            rpc_client,
+            signer,
+            gas_price: gas_price.unwrap_or_default(),
+        })
    }
 }

@@ -522,4 +679,8 @@ impl SigningCosmWasmClient for Client {
    fn signer(&self) -> &DirectSecp256k1HdWallet {
        &self.signer
    }
+
+    fn gas_price(&self) -> &GasPrice {
+        &self.gas_price
+    }
 }
@@ -7,15 +7,19 @@ use crate::nymd::cosmwasm_client::logs::Log;
 use crate::nymd::error::NymdError;
 use cosmrs::crypto::PublicKey;
 use cosmrs::proto::cosmos::auth::v1beta1::BaseAccount;
-use cosmrs::proto::cosmwasm::wasm::v1beta1::{
+use cosmrs::proto::cosmos::base::abci::v1beta1::{
+    GasInfo as ProtoGasInfo, Result as ProtoAbciResult,
+};
+use cosmrs::proto::cosmos::tx::v1beta1::SimulateResponse as ProtoSimulateResponse;
+use cosmrs::proto::cosmwasm::wasm::v1::{
    CodeInfoResponse, ContractCodeHistoryEntry as ProtoContractCodeHistoryEntry,
    ContractCodeHistoryOperationType, ContractInfo as ProtoContractInfo,
 };
-use cosmrs::tendermint::chain;
-use cosmrs::tx::{AccountNumber, SequenceNumber};
+use cosmrs::tendermint::{abci, chain};
+use cosmrs::tx::{AccountNumber, Gas, SequenceNumber};
 use cosmrs::{tx, AccountId, Coin};
 use serde::Serialize;
-use std::convert::TryFrom;
+use std::convert::{TryFrom, TryInto};

 pub type ContractCodeId = u64;

@@ -70,18 +74,6 @@ pub struct Code {

    /// sha256 hash of the code stored
    pub data_hash: Vec<u8>,
-
-    /// An URL to a .tar.gz archive of the source code of the contract,
-    /// which can be used to reproducibly build the Wasm bytecode.
-    ///
-    /// @see https://github.com/CosmWasm/cosmwasm-verify
-    pub source: Option<String>,
-
-    /// A docker image (including version) to reproducibly build the Wasm bytecode from the source code.
-    ///
-    /// @example ```cosmwasm/rust-optimizer:0.8.0```
-    /// @see https://github.com/CosmWasm/cosmwasm-verify
-    pub builder: Option<String>,
 }

 impl TryFrom<CodeInfoResponse> for Code {
@@ -92,31 +84,16 @@ impl TryFrom<CodeInfoResponse> for Code {
            code_id,
            creator,
            data_hash,
-            source,
-            builder,
        } = value;

        let creator = creator
            .parse()
            .map_err(|_| NymdError::MalformedAccountAddress(creator))?;

-        let source = if source.is_empty() {
-            None
-        } else {
-            Some(source)
-        };
-        let builder = if builder.is_empty() {
-            None
-        } else {
-            Some(builder)
-        };
-
        Ok(Code {
            code_id,
            creator,
            data_hash,
-            source,
-            builder,
        })
    }
 }
@@ -242,6 +219,101 @@ impl TryFrom<ProtoContractCodeHistoryEntry> for ContractCodeHistoryEntry {
    }
 }

+#[derive(Debug)]
+pub struct GasInfo {
+    /// GasWanted is the maximum units of work we allow this tx to perform.
+    pub gas_wanted: Gas,
+
+    /// GasUsed is the amount of gas actually consumed.
+    pub gas_used: Gas,
+}
+
+impl From<ProtoGasInfo> for GasInfo {
+    fn from(value: ProtoGasInfo) -> Self {
+        GasInfo {
+            gas_wanted: value.gas_wanted.into(),
+            gas_used: value.gas_used.into(),
+        }
+    }
+}
+
+impl GasInfo {
+    pub fn new(gas_wanted: Gas, gas_used: Gas) -> Self {
+        GasInfo {
+            gas_wanted,
+            gas_used,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct AbciResult {
+    /// Data is any data returned from message or handler execution. It MUST be
+    /// length prefixed in order to separate data from multiple message executions.
+    pub data: Vec<u8>,
+
+    /// Log contains the log information from message or handler execution.
+    // todo: try to parse into Log?
+    pub log: String,
+
+    /// Events contains a slice of Event objects that were emitted during message
+    /// or handler execution.
+    pub events: Vec<abci::Event>,
+}
+
+impl TryFrom<ProtoAbciResult> for AbciResult {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoAbciResult) -> Result<Self, Self::Error> {
+        let mut events = Vec::with_capacity(value.events.len());
+
+        for proto_event in value.events.into_iter() {
+            let type_str = proto_event.r#type;
+
+            let mut attributes = Vec::with_capacity(proto_event.attributes.len());
+            for proto_attribute in proto_event.attributes.into_iter() {
+                let stringified_ked = String::from_utf8(proto_attribute.key)
+                    .map_err(|_| NymdError::DeserializationError("EventAttributeKey".to_owned()))?;
+                let stringified_value = String::from_utf8(proto_attribute.value)
+                    .map_err(|_| NymdError::DeserializationError("EventAttributeKey".to_owned()))?;
+
+                attributes.push(abci::tag::Tag {
+                    key: stringified_ked.parse().unwrap(),
+                    value: stringified_value.parse().unwrap(),
+                })
+            }
+
+            events.push(abci::Event {
+                type_str,
+                attributes,
+            })
+        }
+
+        Ok(AbciResult {
+            data: value.data,
+            log: value.log,
+            events,
+        })
+    }
+}
+
+#[derive(Debug)]
+pub struct SimulateResponse {
+    pub gas_info: Option<GasInfo>,
+    pub result: Option<AbciResult>,
+}
+
+impl TryFrom<ProtoSimulateResponse> for SimulateResponse {
+    type Error = NymdError;
+
+    fn try_from(value: ProtoSimulateResponse) -> Result<Self, Self::Error> {
+        Ok(SimulateResponse {
+            gas_info: value.gas_info.map(|gas_info| gas_info.into()),
+            result: value.result.map(|result| result.try_into()).transpose()?,
+        })
+    }
+}
+
 // ##############################################################################
 // types specific to the signing client (perhaps they should go to separate file)
 // ##############################################################################
@@ -254,21 +326,6 @@ pub struct SignerData {
    pub chain_id: chain::Id,
 }

-#[derive(Debug)]
-pub struct UploadMeta {
-    /// An URL to a .tar.gz archive of the source code of the contract,
-    /// which can be used to reproducibly build the Wasm bytecode.
-    ///
-    /// @see https://github.com/CosmWasm/cosmwasm-verify
-    pub source: Option<String>,
-
-    /// A docker image (including version) to reproducibly build the Wasm bytecode from the source code.
-    ///
-    /// @example ```cosmwasm/rust-optimizer:0.8.0```
-    /// @see https://github.com/CosmWasm/cosmwasm-verify
-    pub builder: Option<String>,
-}
-
 #[derive(Debug)]
 pub struct UploadResult {
    /// Size of the original wasm code in bytes
@@ -290,6 +347,8 @@ pub struct UploadResult {

    /// Transaction hash (might be used as transaction ID)
    pub transaction_hash: tx::Hash,
+
+    pub gas_info: GasInfo,
 }

 #[derive(Debug)]
@@ -316,6 +375,8 @@ pub struct InstantiateResult {

    /// Transaction hash (might be used as transaction ID)
    pub transaction_hash: tx::Hash,
+
+    pub gas_info: GasInfo,
 }

 #[derive(Debug)]
@@ -324,6 +385,8 @@ pub struct ChangeAdminResult {

    /// Transaction hash (might be used as transaction ID)
    pub transaction_hash: tx::Hash,
+
+    pub gas_info: GasInfo,
 }

 #[derive(Debug)]
@@ -332,6 +395,8 @@ pub struct MigrateResult {

    /// Transaction hash (might be used as transaction ID)
    pub transaction_hash: tx::Hash,
+
+    pub gas_info: GasInfo,
 }

 #[derive(Debug)]
@@ -340,4 +405,6 @@ pub struct ExecuteResult {

    /// Transaction hash (might be used as transaction ID)
    pub transaction_hash: tx::Hash,
+
+    pub gas_info: GasInfo,
 }
@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: Apache-2.0

 use crate::nymd::cosmwasm_client::types::ContractCodeId;
-use cosmrs::tendermint::block;
+use cosmrs::tendermint::{abci, block};
 use cosmrs::{bip32, tx, AccountId};
 use std::io;
 use thiserror::Error;
@@ -102,6 +102,12 @@ pub enum NymdError {

    #[error("The provided gas price is malformed")]
    MalformedGasPrice,
+
+    #[error("Failed to estimate gas price for the transaction")]
+    GasEstimationFailure,
+
+    #[error("Abci query failed with code {0} - {1}")]
+    AbciError(u32, abci::Log),
 }

 impl NymdError {
@@ -38,7 +38,7 @@ impl<'a> Mul<Gas> for &'a GasPrice {
        // however, realistically that is impossible to happen as the resultant value
        // would have to be way higher than our token limit of 10^15 (1 billion of tokens * 1 million for denomination)
        // and max value of u128 is approximately 10^38
-        if limit_uint128.u128() * gas_price_numerator > amount.u128() * gas_price_denominator {
+        if limit_uint128 * gas_price_numerator > amount * gas_price_denominator {
            amount += Uint128::new(1);
        }

@@ -17,17 +17,29 @@ pub enum Operation {
    Send,

    BondMixnode,
+    BondMixnodeOnBehalf,
    UnbondMixnode,
+    UnbondMixnodeOnBehalf,
    DelegateToMixnode,
+    DelegateToMixnodeOnBehalf,
    UndelegateFromMixnode,
+    UndelegateFromMixnodeOnBehalf,

    BondGateway,
+    BondGatewayOnBehalf,
    UnbondGateway,
+    UnbondGatewayOnBehalf,

-    UpdateStateParams,
+    UpdateContractSettings,

    BeginMixnodeRewarding,
    FinishMixnodeRewarding,
+
+    TrackUnbondGateway,
+    TrackUnbondMixnode,
+    WithdrawVestedCoins,
+    TrackUndelegation,
+    CreatePeriodicVestingAccount,
 }

 pub(crate) fn calculate_fee(gas_price: &GasPrice, gas_limit: Gas) -> Coin {
@@ -43,14 +55,27 @@ impl fmt::Display for Operation {
            Operation::ChangeAdmin => f.write_str("ChangeAdmin"),
            Operation::Send => f.write_str("Send"),
            Operation::BondMixnode => f.write_str("BondMixnode"),
+            Operation::BondMixnodeOnBehalf => f.write_str("BondMixnodeOnBehalf"),
            Operation::UnbondMixnode => f.write_str("UnbondMixnode"),
+            Operation::UnbondMixnodeOnBehalf => f.write_str("UnbondMixnodeOnBehalf"),
            Operation::BondGateway => f.write_str("BondGateway"),
+            Operation::BondGatewayOnBehalf => f.write_str("BondGatewayOnBehalf"),
            Operation::UnbondGateway => f.write_str("UnbondGateway"),
+            Operation::UnbondGatewayOnBehalf => f.write_str("UnbondGatewayOnBehalf"),
            Operation::DelegateToMixnode => f.write_str("DelegateToMixnode"),
+            Operation::DelegateToMixnodeOnBehalf => f.write_str("DelegateToMixnodeOnBehalf"),
            Operation::UndelegateFromMixnode => f.write_str("UndelegateFromMixnode"),
-            Operation::UpdateStateParams => f.write_str("UpdateStateParams"),
+            Operation::UndelegateFromMixnodeOnBehalf => {
+                f.write_str("UndelegateFromMixnodeOnBehalf")
+            }
+            Operation::UpdateContractSettings => f.write_str("UpdateContractSettings"),
            Operation::BeginMixnodeRewarding => f.write_str("BeginMixnodeRewarding"),
            Operation::FinishMixnodeRewarding => f.write_str("FinishMixnodeRewarding"),
+            Operation::TrackUnbondGateway => f.write_str("TrackUnbondGateway"),
+            Operation::TrackUnbondMixnode => f.write_str("TrackUnbondMixnode"),
+            Operation::WithdrawVestedCoins => f.write_str("WithdrawVestedCoins"),
+            Operation::TrackUndelegation => f.write_str("TrackUndelegation"),
+            Operation::CreatePeriodicVestingAccount => f.write_str("CreatePeriodicVestingAccount"),
        }
    }
 }
@@ -59,23 +84,34 @@ impl Operation {
    // TODO: some value tweaking
    pub fn default_gas_limit(&self) -> Gas {
        match self {
-            Operation::Upload => 2_500_000u64.into(),
+            Operation::Upload => 3_000_000u64.into(),
            Operation::Init => 500_000u64.into(),
            Operation::Migrate => 200_000u64.into(),
            Operation::ChangeAdmin => 80_000u64.into(),
            Operation::Send => 80_000u64.into(),

            Operation::BondMixnode => 175_000u64.into(),
+            Operation::BondMixnodeOnBehalf => 200_000u64.into(),
            Operation::UnbondMixnode => 175_000u64.into(),
+            Operation::UnbondMixnodeOnBehalf => 175_000u64.into(),
            Operation::DelegateToMixnode => 175_000u64.into(),
+            Operation::DelegateToMixnodeOnBehalf => 175_000u64.into(),
            Operation::UndelegateFromMixnode => 175_000u64.into(),
+            Operation::UndelegateFromMixnodeOnBehalf => 175_000u64.into(),

            Operation::BondGateway => 175_000u64.into(),
+            Operation::BondGatewayOnBehalf => 200_000u64.into(),
            Operation::UnbondGateway => 175_000u64.into(),
+            Operation::UnbondGatewayOnBehalf => 200_000u64.into(),

-            Operation::UpdateStateParams => 175_000u64.into(),
+            Operation::UpdateContractSettings => 175_000u64.into(),
            Operation::BeginMixnodeRewarding => 175_000u64.into(),
            Operation::FinishMixnodeRewarding => 175_000u64.into(),
+            Operation::TrackUnbondGateway => 175_000u64.into(),
+            Operation::TrackUnbondMixnode => 175_000u64.into(),
+            Operation::WithdrawVestedCoins => 175_000u64.into(),
+            Operation::TrackUndelegation => 175_000u64.into(),
+            Operation::CreatePeriodicVestingAccount => 175_000u64.into(),
        }
    }

@@ -89,9 +125,8 @@ impl Operation {
        Fee::from_amount_and_gas(fee, gas_limit)
    }

-    pub(crate) fn determine_fee(&self, gas_price: &GasPrice, gas_limit: Option<Gas>) -> Fee {
-        let gas_limit = gas_limit.unwrap_or_else(|| self.default_gas_limit());
-        Self::determine_custom_fee(gas_price, gas_limit)
+    pub fn default_fee(&self, gas_price: &GasPrice) -> Fee {
+        Self::determine_custom_fee(gas_price, self.default_gas_limit())
    }
 }

@@ -0,0 +1,33 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use cosmrs::tx;
+
+pub mod gas_price;
+pub mod helpers;
+
+pub const DEFAULT_SIMULATED_GAS_MULTIPLIER: f32 = 1.3;
+
+#[derive(Debug, Clone)]
+pub enum Fee {
+    Manual(tx::Fee),
+    Auto(Option<f32>),
+}
+
+impl From<tx::Fee> for Fee {
+    fn from(fee: tx::Fee) -> Self {
+        Fee::Manual(fee)
+    }
+}
+
+impl From<f32> for Fee {
+    fn from(multiplier: f32) -> Self {
+        Fee::Auto(Some(multiplier))
+    }
+}
+
+impl Default for Fee {
+    fn default() -> Self {
+        Fee::Auto(Some(DEFAULT_SIMULATED_GAS_MULTIPLIER))
+    }
+}
@@ -0,0 +1,8 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+mod vesting_query_client;
+mod vesting_signing_client;
+
+pub use vesting_query_client::VestingQueryClient;
+pub use vesting_signing_client::VestingSigningClient;
@@ -0,0 +1,176 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub use crate::nymd::cosmwasm_client::client::CosmWasmClient;
+use crate::nymd::error::NymdError;
+use crate::nymd::NymdClient;
+use async_trait::async_trait;
+use cosmwasm_std::{Coin, Timestamp};
+use vesting_contract::messages::QueryMsg as VestingQueryMsg;
+
+#[async_trait]
+pub trait VestingQueryClient {
+    async fn locked_coins(
+        &self,
+        address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError>;
+
+    async fn spendable_coins(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError>;
+
+    async fn vested_coins(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError>;
+
+    async fn vesting_coins(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError>;
+
+    async fn vesting_start_time(
+        &self,
+        vesting_account_address: &str,
+    ) -> Result<Timestamp, NymdError>;
+
+    async fn vesting_end_time(&self, vesting_account_address: &str)
+        -> Result<Timestamp, NymdError>;
+
+    async fn original_vesting(&self, vesting_account_address: &str) -> Result<Coin, NymdError>;
+
+    async fn delegated_free(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError>;
+
+    async fn delegated_vesting(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError>;
+}
+
+#[async_trait]
+impl<C: CosmWasmClient + Sync + Send> VestingQueryClient for NymdClient<C> {
+    async fn locked_coins(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError> {
+        let request = VestingQueryMsg::LockedCoins {
+            vesting_account_address: vesting_account_address.to_string(),
+            block_time,
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+
+    async fn spendable_coins(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError> {
+        let request = VestingQueryMsg::SpendableCoins {
+            vesting_account_address: vesting_account_address.to_string(),
+            block_time,
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+    async fn vested_coins(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError> {
+        let request = VestingQueryMsg::GetVestedCoins {
+            vesting_account_address: vesting_account_address.to_string(),
+            block_time,
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+    async fn vesting_coins(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError> {
+        let request = VestingQueryMsg::GetVestingCoins {
+            vesting_account_address: vesting_account_address.to_string(),
+            block_time,
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+
+    async fn vesting_start_time(
+        &self,
+        vesting_account_address: &str,
+    ) -> Result<Timestamp, NymdError> {
+        let request = VestingQueryMsg::GetStartTime {
+            vesting_account_address: vesting_account_address.to_string(),
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+
+    async fn vesting_end_time(
+        &self,
+        vesting_account_address: &str,
+    ) -> Result<Timestamp, NymdError> {
+        let request = VestingQueryMsg::GetEndTime {
+            vesting_account_address: vesting_account_address.to_string(),
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+
+    async fn original_vesting(&self, vesting_account_address: &str) -> Result<Coin, NymdError> {
+        let request = VestingQueryMsg::GetOriginalVesting {
+            vesting_account_address: vesting_account_address.to_string(),
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+
+    async fn delegated_free(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError> {
+        let request = VestingQueryMsg::GetDelegatedFree {
+            vesting_account_address: vesting_account_address.to_string(),
+            block_time,
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+
+    async fn delegated_vesting(
+        &self,
+        vesting_account_address: &str,
+        block_time: Option<Timestamp>,
+    ) -> Result<Coin, NymdError> {
+        let request = VestingQueryMsg::GetDelegatedVesting {
+            vesting_account_address: vesting_account_address.to_string(),
+            block_time,
+        };
+        self.client
+            .query_contract_smart(self.vesting_contract_address()?, &request)
+            .await
+    }
+}
@@ -0,0 +1,294 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub use crate::nymd::cosmwasm_client::signing_client::SigningCosmWasmClient;
+use crate::nymd::cosmwasm_client::types::ExecuteResult;
+use crate::nymd::error::NymdError;
+use crate::nymd::fee::helpers::Operation;
+use crate::nymd::{cosmwasm_coin_to_cosmos_coin, NymdClient};
+use async_trait::async_trait;
+use cosmwasm_std::Coin;
+use mixnet_contract::{Gateway, IdentityKey, IdentityKeyRef, MixNode};
+use vesting_contract::messages::ExecuteMsg as VestingExecuteMsg;
+
+#[async_trait]
+pub trait VestingSigningClient {
+    async fn vesting_bond_gateway(
+        &self,
+        gateway: Gateway,
+        owner_signature: &str,
+        pledge: Coin,
+    ) -> Result<ExecuteResult, NymdError>;
+
+    async fn vesting_unbond_gateway(&self) -> Result<ExecuteResult, NymdError>;
+
+    async fn vesting_track_unbond_gateway(
+        &self,
+        owner: &str,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError>;
+
+    async fn vesting_bond_mixnode(
+        &self,
+        mix_node: MixNode,
+        owner_signature: &str,
+        pledge: Coin,
+    ) -> Result<ExecuteResult, NymdError>;
+    async fn vesting_unbond_mixnode(&self) -> Result<ExecuteResult, NymdError>;
+
+    async fn vesting_track_unbond_mixnode(
+        &self,
+        owner: &str,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError>;
+
+    async fn withdraw_vested_coins(&self, amount: Coin) -> Result<ExecuteResult, NymdError>;
+
+    async fn vesting_track_undelegation(
+        &self,
+        address: &str,
+        mix_identity: IdentityKey,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError>;
+
+    async fn vesting_delegate_to_mixnode<'a>(
+        &self,
+        mix_identity: IdentityKeyRef<'a>,
+        amount: &Coin,
+    ) -> Result<ExecuteResult, NymdError>;
+
+    async fn vesting_undelegate_from_mixnode<'a>(
+        &self,
+        mix_identity: IdentityKeyRef<'a>,
+    ) -> Result<ExecuteResult, NymdError>;
+
+    async fn create_periodic_vesting_account(
+        &self,
+        address: &str,
+        start_time: Option<u64>,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError>;
+}
+
+#[async_trait]
+impl<C: SigningCosmWasmClient + Sync + Send> VestingSigningClient for NymdClient<C> {
+    async fn vesting_bond_gateway(
+        &self,
+        gateway: Gateway,
+        owner_signature: &str,
+        pledge: Coin,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::BondGateway);
+        let req = VestingExecuteMsg::BondGateway {
+            gateway,
+            owner_signature: owner_signature.to_string(),
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::BondGateway",
+                vec![cosmwasm_coin_to_cosmos_coin(pledge)],
+            )
+            .await
+    }
+
+    async fn vesting_unbond_gateway(&self) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::UnbondGateway);
+        let req = VestingExecuteMsg::UnbondGateway {};
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::UnbondGateway",
+                vec![],
+            )
+            .await
+    }
+
+    async fn vesting_track_unbond_gateway(
+        &self,
+        owner: &str,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::TrackUnbondGateway);
+        let req = VestingExecuteMsg::TrackUnbondGateway {
+            owner: owner.to_string(),
+            amount,
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::TrackUnbondGateway",
+                vec![],
+            )
+            .await
+    }
+
+    async fn vesting_bond_mixnode(
+        &self,
+        mix_node: MixNode,
+        owner_signature: &str,
+        pledge: Coin,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::BondMixnode);
+        let req = VestingExecuteMsg::BondMixnode {
+            mix_node,
+            owner_signature: owner_signature.to_string(),
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::BondMixnode",
+                vec![cosmwasm_coin_to_cosmos_coin(pledge)],
+            )
+            .await
+    }
+
+    async fn vesting_unbond_mixnode(&self) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::UnbondMixnode);
+        let req = VestingExecuteMsg::UnbondMixnode {};
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::UnbondMixnode",
+                vec![],
+            )
+            .await
+    }
+
+    async fn vesting_track_unbond_mixnode(
+        &self,
+        owner: &str,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::TrackUnbondMixnode);
+        let req = VestingExecuteMsg::TrackUnbondMixnode {
+            owner: owner.to_string(),
+            amount,
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::TrackUnbondMixnode",
+                vec![],
+            )
+            .await
+    }
+
+    async fn withdraw_vested_coins(&self, amount: Coin) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::WithdrawVestedCoins);
+        let req = VestingExecuteMsg::WithdrawVestedCoins { amount };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::WithdrawVested",
+                vec![],
+            )
+            .await
+    }
+
+    async fn vesting_track_undelegation(
+        &self,
+        address: &str,
+        mix_identity: IdentityKey,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::TrackUndelegation);
+        let req = VestingExecuteMsg::TrackUndelegation {
+            owner: address.to_string(),
+            mix_identity,
+            amount,
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::TrackUndelegation",
+                vec![],
+            )
+            .await
+    }
+    async fn vesting_delegate_to_mixnode<'a>(
+        &self,
+        mix_identity: IdentityKeyRef<'a>,
+        amount: &Coin,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::DelegateToMixnode);
+        let req = VestingExecuteMsg::DelegateToMixnode {
+            mix_identity: mix_identity.into(),
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::DeledateToMixnode",
+                vec![cosmwasm_coin_to_cosmos_coin(amount.to_owned())],
+            )
+            .await
+    }
+    async fn vesting_undelegate_from_mixnode<'a>(
+        &self,
+        mix_identity: IdentityKeyRef<'a>,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::UndelegateFromMixnode);
+        let req = VestingExecuteMsg::UndelegateFromMixnode {
+            mix_identity: mix_identity.into(),
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::UndelegateFromMixnode",
+                vec![],
+            )
+            .await
+    }
+    async fn create_periodic_vesting_account(
+        &self,
+        address: &str,
+        start_time: Option<u64>,
+        amount: Coin,
+    ) -> Result<ExecuteResult, NymdError> {
+        let fee = self.operation_fee(Operation::CreatePeriodicVestingAccount);
+        let req = VestingExecuteMsg::CreateAccount {
+            address: address.to_string(),
+            start_time,
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.vesting_contract_address()?,
+                &req,
+                fee,
+                "VestingContract::CreatePeriodicVestingAccount",
+                vec![cosmwasm_coin_to_cosmos_coin(amount)],
+            )
+            .await
+    }
+}
@@ -10,7 +10,7 @@ use cosmrs::tx::SignDoc;
 use cosmrs::{tx, AccountId};

 /// Derivation information required to derive a keypair and an address from a mnemonic.
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 struct Secp256k1Derivation {
    hd_path: DerivationPath,
    prefix: String,
@@ -40,7 +40,7 @@ impl AccountData {

 type Secp256k1Keypair = (SigningKey, PublicKey);

-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct DirectSecp256k1HdWallet {
    /// Base secret
    secret: bip39::Mnemonic,
@@ -8,4 +8,4 @@ description = "Crutch library until there is proper SerDe support for coconut st
 serde = { version = "1.0", features = ["derive"] }
 getset = "0.1.1"

-coconut-rs = { git = "https://github.com/nymtech/coconut.git", branch = "0.5.0" }
+nymcoconut = {path = "../nymcoconut" }
@@ -4,7 +4,7 @@
 use getset::{CopyGetters, Getters};
 use serde::{Deserialize, Serialize};

-pub use coconut_rs::*;
+pub use nymcoconut::*;

 #[derive(Serialize, Deserialize, Getters, CopyGetters, Clone)]
 pub struct Credential {
@@ -42,7 +42,7 @@ impl Credential {
            .iter()
            .map(hash_to_scalar)
            .collect::<Vec<Attribute>>();
-        coconut_rs::verify_credential(&params, verification_key, &self.theta, &public_attributes)
+        nymcoconut::verify_credential(&params, verification_key, &self.theta, &public_attributes)
    }
 }

@@ -84,7 +84,7 @@ pub struct BlindSignRequestBody {
    #[getset(get = "pub")]
    blind_sign_request: BlindSignRequest,
    #[getset(get = "pub")]
-    public_key: coconut_rs::PublicKey,
+    public_key: nymcoconut::PublicKey,
    public_attributes: Vec<String>,
    #[getset(get = "pub")]
    total_params: u32,
@@ -92,13 +92,13 @@ pub struct BlindSignRequestBody {

 impl BlindSignRequestBody {
    pub fn new(
-        blind_sign_request: BlindSignRequest,
-        public_key: &coconut_rs::PublicKey,
+        blind_sign_request: &BlindSignRequest,
+        public_key: &nymcoconut::PublicKey,
        public_attributes: &[Attribute],
        total_params: u32,
    ) -> BlindSignRequestBody {
        BlindSignRequestBody {
-            blind_sign_request,
+            blind_sign_request: blind_sign_request.clone(),
            public_key: public_key.clone(),
            public_attributes: public_attributes
                .iter()
@@ -6,41 +6,71 @@
 // right now this has no double-spending protection, spender binding, etc
 // it's the simplest possible case

+use coconut_interface::{
+    Credential, Parameters, PrivateAttribute, PublicAttribute, Signature, VerificationKey,
+};
+use network_defaults::BANDWIDTH_VALUE;
 use url::Url;

-use super::utils::{obtain_aggregate_signature, prepare_credential_for_spending};
 use crate::error::Error;
-use coconut_interface::{hash_to_scalar, Credential, Parameters, Signature, VerificationKey};
-use network_defaults::BANDWIDTH_VALUE;

-pub const PUBLIC_ATTRIBUTES: u32 = 1;
-pub const PRIVATE_ATTRIBUTES: u32 = 1;
+use super::utils::{obtain_aggregate_signature, prepare_credential_for_spending};
+
+pub const PUBLIC_ATTRIBUTES: u32 = 2;
+pub const PRIVATE_ATTRIBUTES: u32 = 2;
 pub const TOTAL_ATTRIBUTES: u32 = PUBLIC_ATTRIBUTES + PRIVATE_ATTRIBUTES;

+pub struct BandwidthVoucherAttributes {
+    // a random secret value generated by the client used for double-spending detection
+    pub serial_number: PrivateAttribute,
+    // a random secret value generated by the client used to bind multiple credentials together
+    pub binding_number: PrivateAttribute,
+    // the value (e.g., bandwidth) encoded in this voucher
+    pub voucher_value: PublicAttribute,
+    // a field with public information, e.g., type of voucher, epoch etc.
+    pub voucher_info: PublicAttribute,
+}
+
+impl BandwidthVoucherAttributes {
+    pub fn get_public_attributes(&self) -> Vec<PublicAttribute> {
+        vec![self.voucher_value, self.voucher_info]
+    }
+
+    pub fn get_private_attributes(&self) -> Vec<PrivateAttribute> {
+        vec![self.serial_number, self.binding_number]
+    }
+}
+
 // TODO: this definitely has to be moved somewhere else. It's just a temporary solution
-pub async fn obtain_signature(raw_identity: &[u8], validators: &[Url]) -> Result<Signature, Error> {
-    let public_attributes = vec![hash_to_scalar(BANDWIDTH_VALUE.to_be_bytes())];
-    let private_attributes = vec![hash_to_scalar(raw_identity)];
+pub async fn obtain_signature(
+    params: &Parameters,
+    attributes: &BandwidthVoucherAttributes,
+    validators: &[Url],
+) -> Result<Signature, Error> {
+    let public_attributes = attributes.get_public_attributes();
+    let private_attributes = attributes.get_private_attributes();

-    let params = Parameters::new(TOTAL_ATTRIBUTES)?;
-
-    obtain_aggregate_signature(&params, &public_attributes, &private_attributes, validators).await
+    obtain_aggregate_signature(params, &public_attributes, &private_attributes, validators).await
 }

 pub fn prepare_for_spending(
    raw_identity: &[u8],
    signature: &Signature,
+    attributes: &BandwidthVoucherAttributes,
    verification_key: &VerificationKey,
 ) -> Result<Credential, Error> {
-    let public_attributes = vec![BANDWIDTH_VALUE.to_be_bytes().to_vec()];
-    let private_attributes = vec![raw_identity.to_vec()];
+    let public_attributes = vec![
+        raw_identity.to_vec(),
+        BANDWIDTH_VALUE.to_be_bytes().to_vec(),
+    ];

    let params = Parameters::new(TOTAL_ATTRIBUTES)?;

    prepare_credential_for_spending(
        &params,
        public_attributes,
-        private_attributes,
+        attributes.serial_number,
+        attributes.binding_number,
        signature,
        verification_key,
    )
@@ -1,14 +1,16 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use crate::error::Error;
 use coconut_interface::{
-    aggregate_signature_shares, aggregate_verification_keys, hash_to_scalar, prepare_blind_sign,
-    prove_credential, Attribute, BlindSignRequestBody, Credential, Parameters, Signature,
+    aggregate_signature_shares, aggregate_verification_keys, prepare_blind_sign,
+    prove_bandwidth_credential, Attribute, BlindSignRequestBody, Credential, Parameters, Signature,
    SignatureShare, VerificationKey,
 };
 use url::Url;

+use crate::coconut::bandwidth::PRIVATE_ATTRIBUTES;
+use crate::error::Error;
+
 /// Contacts all provided validators and then aggregate their verification keys.
 ///
 /// # Arguments
@@ -63,17 +65,18 @@ async fn obtain_partial_credential(
    public_attributes: &[Attribute],
    private_attributes: &[Attribute],
    client: &validator_client::ApiClient,
+    validator_vk: &VerificationKey,
 ) -> Result<Signature, Error> {
    let elgamal_keypair = coconut_interface::elgamal_keygen(params);
    let blind_sign_request = prepare_blind_sign(
        params,
-        elgamal_keypair.public_key(),
+        &elgamal_keypair,
        private_attributes,
        public_attributes,
    )?;

    let blind_sign_request_body = BlindSignRequestBody::new(
-        blind_sign_request,
+        &blind_sign_request,
        elgamal_keypair.public_key(),
        public_attributes,
        (public_attributes.len() + private_attributes.len()) as u32,
@@ -83,7 +86,17 @@ async fn obtain_partial_credential(
        .blind_sign(&blind_sign_request_body)
        .await?
        .blinded_signature;
-    Ok(blinded_signature.unblind(elgamal_keypair.private_key()))
+
+    let unblinded_signature = blinded_signature.unblind(
+        params,
+        elgamal_keypair.private_key(),
+        validator_vk,
+        private_attributes,
+        public_attributes,
+        &blind_sign_request.get_commitment_hash(),
+    )?;
+
+    Ok(unblinded_signature)
 }

 pub async fn obtain_aggregate_signature(
@@ -97,40 +110,76 @@ pub async fn obtain_aggregate_signature(
    }

    let mut shares = Vec::with_capacity(validators.len());
+    let mut validators_partial_vks: Vec<VerificationKey> = Vec::with_capacity(validators.len());

    let mut client = validator_client::ApiClient::new(validators[0].clone());
-    let first =
-        obtain_partial_credential(params, public_attributes, private_attributes, &client).await?;
+    let validator_partial_vk = client.get_coconut_verification_key().await?;
+    validators_partial_vks.push(validator_partial_vk.key.clone());
+
+    let first = obtain_partial_credential(
+        params,
+        public_attributes,
+        private_attributes,
+        &client,
+        &validator_partial_vk.key,
+    )
+    .await?;
    shares.push(SignatureShare::new(first, 0));

    for (id, validator_url) in validators.iter().enumerate().skip(1) {
        client.change_validator_api(validator_url.clone());
-        let signature =
-            obtain_partial_credential(params, public_attributes, private_attributes, &client)
-                .await?;
+        let validator_partial_vk = client.get_coconut_verification_key().await?;
+        validators_partial_vks.push(validator_partial_vk.key.clone());
+        let signature = obtain_partial_credential(
+            params,
+            public_attributes,
+            private_attributes,
+            &client,
+            &validator_partial_vk.key,
+        )
+        .await?;
        let share = SignatureShare::new(signature, id as u64);
        shares.push(share)
    }

-    Ok(aggregate_signature_shares(&shares)?)
+    let mut attributes = Vec::with_capacity(private_attributes.len() + public_attributes.len());
+    attributes.extend_from_slice(private_attributes);
+    attributes.extend_from_slice(public_attributes);
+
+    let mut indices: Vec<u64> = Vec::with_capacity(validators_partial_vks.len());
+    for i in 1..validators_partial_vks.len() {
+        indices.push(i as u64);
+    }
+    let verification_key =
+        aggregate_verification_keys(&validators_partial_vks, Some(indices.as_ref()))?;
+
+    Ok(aggregate_signature_shares(
+        params,
+        &verification_key,
+        &attributes,
+        &shares,
+    )?)
 }

 // TODO: better type flow
 pub fn prepare_credential_for_spending(
    params: &Parameters,
    public_attributes: Vec<Vec<u8>>,
-    private_attributes: Vec<Vec<u8>>,
+    serial_number: Attribute,
+    binding_number: Attribute,
    signature: &Signature,
    verification_key: &VerificationKey,
 ) -> Result<Credential, Error> {
-    let private_attributes = private_attributes
-        .iter()
-        .map(hash_to_scalar)
-        .collect::<Vec<Attribute>>();
-    let theta = prove_credential(params, verification_key, signature, &private_attributes)?;
+    let theta = prove_bandwidth_credential(
+        params,
+        verification_key,
+        signature,
+        serial_number,
+        binding_number,
+    )?;

    Ok(Credential::new(
-        (public_attributes.len() + private_attributes.len()) as u32,
+        (public_attributes.len() + PRIVATE_ATTRIBUTES as usize) as u32,
        theta,
        public_attributes,
        signature,
@@ -1,7 +1,7 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use ed25519_dalek::ed25519::signature::Signature as SignatureTrait;
+pub use ed25519_dalek::ed25519::signature::Signature as SignatureTrait;
 pub use ed25519_dalek::SignatureError;
 pub use ed25519_dalek::{Verifier, PUBLIC_KEY_LENGTH, SECRET_KEY_LENGTH, SIGNATURE_LENGTH};
 use nymsphinx_types::{DestinationAddressBytes, DESTINATION_ADDRESS_LENGTH};
@@ -10,33 +10,33 @@ use rand::{CryptoRng, RngCore};
 use std::fmt::{self, Display, Formatter};

 #[derive(Debug)]
-pub enum KeyRecoveryError {
+pub enum Ed25519RecoveryError {
    MalformedBytes(SignatureError),
    MalformedString(bs58::decode::Error),
 }

-impl From<SignatureError> for KeyRecoveryError {
+impl From<SignatureError> for Ed25519RecoveryError {
    fn from(err: SignatureError) -> Self {
-        KeyRecoveryError::MalformedBytes(err)
+        Ed25519RecoveryError::MalformedBytes(err)
    }
 }

-impl From<bs58::decode::Error> for KeyRecoveryError {
+impl From<bs58::decode::Error> for Ed25519RecoveryError {
    fn from(err: bs58::decode::Error) -> Self {
-        KeyRecoveryError::MalformedString(err)
+        Ed25519RecoveryError::MalformedString(err)
    }
 }

-impl fmt::Display for KeyRecoveryError {
+impl fmt::Display for Ed25519RecoveryError {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        match self {
-            KeyRecoveryError::MalformedBytes(err) => write!(f, "malformed bytes - {}", err),
-            KeyRecoveryError::MalformedString(err) => write!(f, "malformed string - {}", err),
+            Ed25519RecoveryError::MalformedBytes(err) => write!(f, "malformed bytes - {}", err),
+            Ed25519RecoveryError::MalformedString(err) => write!(f, "malformed string - {}", err),
        }
    }
 }

-impl std::error::Error for KeyRecoveryError {}
+impl std::error::Error for Ed25519RecoveryError {}

 /// Keypair for usage in ed25519 EdDSA.
 pub struct KeyPair {
@@ -62,7 +62,7 @@ impl KeyPair {
        &self.public_key
    }

-    pub fn from_bytes(priv_bytes: &[u8], pub_bytes: &[u8]) -> Result<Self, KeyRecoveryError> {
+    pub fn from_bytes(priv_bytes: &[u8], pub_bytes: &[u8]) -> Result<Self, Ed25519RecoveryError> {
        Ok(KeyPair {
            private_key: PrivateKey::from_bytes(priv_bytes)?,
            public_key: PublicKey::from_bytes(pub_bytes)?,
@@ -115,7 +115,7 @@ impl PublicKey {
        self.0.to_bytes()
    }

-    pub fn from_bytes(b: &[u8]) -> Result<Self, KeyRecoveryError> {
+    pub fn from_bytes(b: &[u8]) -> Result<Self, Ed25519RecoveryError> {
        Ok(PublicKey(ed25519_dalek::PublicKey::from_bytes(b)?))
    }

@@ -123,7 +123,7 @@ impl PublicKey {
        bs58::encode(self.to_bytes()).into_string()
    }

-    pub fn from_base58_string<I: AsRef<[u8]>>(val: I) -> Result<Self, KeyRecoveryError> {
+    pub fn from_base58_string<I: AsRef<[u8]>>(val: I) -> Result<Self, Ed25519RecoveryError> {
        let bytes = bs58::decode(val).into_vec()?;
        Self::from_bytes(&bytes)
    }
@@ -134,7 +134,7 @@ impl PublicKey {
 }

 impl PemStorableKey for PublicKey {
-    type Error = KeyRecoveryError;
+    type Error = Ed25519RecoveryError;

    fn pem_type() -> &'static str {
        "ED25519 PUBLIC KEY"
@@ -170,7 +170,7 @@ impl PrivateKey {
        self.0.to_bytes()
    }

-    pub fn from_bytes(b: &[u8]) -> Result<Self, KeyRecoveryError> {
+    pub fn from_bytes(b: &[u8]) -> Result<Self, Ed25519RecoveryError> {
        Ok(PrivateKey(ed25519_dalek::SecretKey::from_bytes(b)?))
    }

@@ -178,7 +178,7 @@ impl PrivateKey {
        bs58::encode(&self.to_bytes()).into_string()
    }

-    pub fn from_base58_string<I: AsRef<[u8]>>(val: I) -> Result<Self, KeyRecoveryError> {
+    pub fn from_base58_string<I: AsRef<[u8]>>(val: I) -> Result<Self, Ed25519RecoveryError> {
        let bytes = bs58::decode(val).into_vec()?;
        Self::from_bytes(&bytes)
    }
@@ -192,7 +192,7 @@ impl PrivateKey {
 }

 impl PemStorableKey for PrivateKey {
-    type Error = KeyRecoveryError;
+    type Error = Ed25519RecoveryError;

    fn pem_type() -> &'static str {
        "ED25519 PRIVATE KEY"
@@ -211,11 +211,20 @@ impl PemStorableKey for PrivateKey {
 pub struct Signature(ed25519_dalek::Signature);

 impl Signature {
+    pub fn to_base58_string(&self) -> String {
+        bs58::encode(&self.to_bytes()).into_string()
+    }
+
+    pub fn from_base58_string<I: AsRef<[u8]>>(val: I) -> Result<Self, Ed25519RecoveryError> {
+        let bytes = bs58::decode(val).into_vec()?;
+        Self::from_bytes(&bytes)
+    }
+
    pub fn to_bytes(&self) -> [u8; SIGNATURE_LENGTH] {
        self.0.to_bytes()
    }

-    pub fn from_bytes(bytes: &[u8]) -> Result<Self, SignatureError> {
+    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Ed25519RecoveryError> {
        Ok(Signature(ed25519_dalek::Signature::from_bytes(bytes)?))
    }
 }
@@ -7,9 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [dependencies]
-# this branch is identical to 0.14.1 with addition of updated k256 dependency required to help poor cargo choose correct version
-cosmwasm-std = { git = "https://github.com/jstuczyn/cosmwasm", branch = "0.14.1-updatedk256" }
-#cosmwasm-std = { version = "0.14.1" }
+cosmwasm-std = "1.0.0-beta2"

 serde = { version = "1.0", features = ["derive"] }
 serde_repr = "0.1"
@@ -17,7 +15,7 @@ schemars = "0.8"
 ts-rs = { version = "5.1", optional = true }
 thiserror = "1.0"
 network-defaults = { path = "../network-defaults" }
-fixed = "1.1"
+fixed = { version = "1.1", features = ["serde"] }
 az = "1.1"
 log = "0.4.14"

@@ -1,3 +1,6 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
 // due to code generated by JsonSchema
 #![allow(clippy::field_reassign_with_default)]

@@ -7,51 +10,41 @@ use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use std::fmt::Display;

-#[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
-pub struct UnpackedDelegation<T> {
+#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, JsonSchema)]
+pub struct Delegation {
    pub owner: Addr,
    pub node_identity: IdentityKey,
-    pub delegation_data: T,
-}
-
-impl<T> UnpackedDelegation<T> {
-    pub fn new(owner: Addr, node_identity: IdentityKey, delegation_data: T) -> Self {
-        UnpackedDelegation {
-            owner,
-            node_identity,
-            delegation_data,
-        }
-    }
-}
-
-#[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
-pub struct RawDelegationData {
-    pub amount: Uint128,
+    pub amount: Coin,
    pub block_height: u64,
-}
-
-impl RawDelegationData {
-    pub fn new(amount: Uint128, block_height: u64) -> Self {
-        RawDelegationData {
-            amount,
-            block_height,
-        }
-    }
-}
-
-#[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
-pub struct Delegation {
-    owner: Addr,
-    amount: Coin,
-    block_height: u64,
+    pub proxy: Option<Addr>, // proxy address used to delegate the funds on behalf of anouther address
 }

 impl Delegation {
-    pub fn new(owner: Addr, amount: Coin, block_height: u64) -> Self {
+    pub fn new(
+        owner: Addr,
+        node_identity: IdentityKey,
+        amount: Coin,
+        block_height: u64,
+        proxy: Option<Addr>,
+    ) -> Self {
        Delegation {
            owner,
+            node_identity,
            amount,
            block_height,
+            proxy,
+        }
+    }
+
+    // TODO: change that to use .joined_key() and return Vec<u8>
+    pub fn storage_key(&self) -> (IdentityKey, Addr) {
+        (self.node_identity(), self.owner())
+    }
+
+    pub fn increment_amount(&mut self, amount: Uint128, at_height: Option<u64>) {
+        self.amount.amount += amount;
+        if let Some(at_height) = at_height {
+            self.block_height = at_height;
        }
    }

@@ -59,6 +52,10 @@ impl Delegation {
        &self.amount
    }

+    pub fn node_identity(&self) -> IdentityKey {
+        self.node_identity.clone()
+    }
+
    pub fn owner(&self) -> Addr {
        self.owner.clone()
    }
@@ -72,65 +69,56 @@ impl Display for Delegation {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        write!(
            f,
-            "{} {} delegated by {} at block {}",
-            self.amount.amount, self.amount.denom, self.owner, self.block_height
+            "{} delegated towards {} by {} at block {}",
+            self.amount, self.node_identity, self.owner, self.block_height
        )
    }
 }

 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
 pub struct PagedMixDelegationsResponse {
-    pub node_identity: IdentityKey,
    pub delegations: Vec<Delegation>,
-    pub start_next_after: Option<Addr>,
+    pub start_next_after: Option<String>,
 }

 impl PagedMixDelegationsResponse {
-    pub fn new(
-        node_identity: IdentityKey,
-        delegations: Vec<Delegation>,
-        start_next_after: Option<Addr>,
-    ) -> Self {
+    pub fn new(delegations: Vec<Delegation>, start_next_after: Option<Addr>) -> Self {
        PagedMixDelegationsResponse {
-            node_identity,
            delegations,
-            start_next_after,
+            start_next_after: start_next_after.map(|s| s.to_string()),
        }
    }
 }

 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
-pub struct PagedReverseMixDelegationsResponse {
-    pub delegation_owner: Addr,
-    pub delegated_nodes: Vec<IdentityKey>,
+pub struct PagedDelegatorDelegationsResponse {
+    pub delegations: Vec<Delegation>,
    pub start_next_after: Option<IdentityKey>,
 }

-impl PagedReverseMixDelegationsResponse {
-    pub fn new(
-        delegation_owner: Addr,
-        delegated_nodes: Vec<IdentityKey>,
-        start_next_after: Option<IdentityKey>,
-    ) -> Self {
-        PagedReverseMixDelegationsResponse {
-            delegation_owner,
-            delegated_nodes,
+impl PagedDelegatorDelegationsResponse {
+    pub fn new(delegations: Vec<Delegation>, start_next_after: Option<IdentityKey>) -> Self {
+        PagedDelegatorDelegationsResponse {
+            delegations,
            start_next_after,
        }
    }
 }

 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
-pub struct PagedAllDelegationsResponse<T> {
-    pub delegations: Vec<UnpackedDelegation<T>>,
-    pub start_next_after: Option<Vec<u8>>,
+pub struct PagedAllDelegationsResponse {
+    pub delegations: Vec<Delegation>,
+    pub start_next_after: Option<(IdentityKey, String)>,
 }

-impl<T> PagedAllDelegationsResponse<T> {
-    pub fn new(delegations: Vec<UnpackedDelegation<T>>, start_next_after: Option<Vec<u8>>) -> Self {
+impl PagedAllDelegationsResponse {
+    pub fn new(
+        delegations: Vec<Delegation>,
+        start_next_after: Option<(IdentityKey, Addr)>,
+    ) -> Self {
        PagedAllDelegationsResponse {
            delegations,
-            start_next_after,
+            start_next_after: start_next_after.map(|(id, addr)| (id, addr.to_string())),
        }
    }
 }
@@ -23,19 +23,27 @@ pub struct Gateway {

 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
 pub struct GatewayBond {
-    pub bond_amount: Coin,
+    pub pledge_amount: Coin,
    pub owner: Addr,
    pub block_height: u64,
    pub gateway: Gateway,
+    pub proxy: Option<Addr>,
 }

 impl GatewayBond {
-    pub fn new(bond_amount: Coin, owner: Addr, block_height: u64, gateway: Gateway) -> Self {
+    pub fn new(
+        pledge_amount: Coin,
+        owner: Addr,
+        block_height: u64,
+        gateway: Gateway,
+        proxy: Option<Addr>,
+    ) -> Self {
        GatewayBond {
-            bond_amount,
+            pledge_amount,
            owner,
            block_height,
            gateway,
+            proxy,
        }
    }

@@ -43,8 +51,8 @@ impl GatewayBond {
        &self.gateway.identity_key
    }

-    pub fn bond_amount(&self) -> Coin {
-        self.bond_amount.clone()
+    pub fn pledge_amount(&self) -> Coin {
+        self.pledge_amount.clone()
    }

    pub fn owner(&self) -> &Addr {
@@ -59,17 +67,17 @@ impl GatewayBond {
 impl PartialOrd for GatewayBond {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        // first remove invalid cases
-        if self.bond_amount.denom != other.bond_amount.denom {
+        if self.pledge_amount.denom != other.pledge_amount.denom {
            return None;
        }

-        // try to order by total bond
-        let bond_cmp = self
-            .bond_amount
+        // try to order by total pledge
+        let pledge_cmp = self
+            .pledge_amount
            .amount
-            .partial_cmp(&other.bond_amount.amount)?;
-        if bond_cmp != Ordering::Equal {
-            return Some(bond_cmp);
+            .partial_cmp(&other.pledge_amount.amount)?;
+        if pledge_cmp != Ordering::Equal {
+            return Some(pledge_cmp);
        }

        // then check block height
@@ -94,7 +102,10 @@ impl Display for GatewayBond {
        write!(
            f,
            "amount: {} {}, owner: {}, identity: {}",
-            self.bond_amount.amount, self.bond_amount.denom, self.owner, self.gateway.identity_key
+            self.pledge_amount.amount,
+            self.pledge_amount.denom,
+            self.owner,
+            self.gateway.identity_key
        )
    }
 }
@@ -123,7 +134,7 @@ impl PagedGatewayResponse {
 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
 pub struct GatewayOwnershipResponse {
    pub address: Addr,
-    pub has_gateway: bool,
+    pub gateway: Option<GatewayBond>,
 }

 #[cfg(test)]
@@ -150,38 +161,43 @@ mod tests {
        let _0foos = Coin::new(0, "foo");

        let gate1 = GatewayBond {
-            bond_amount: _150foos.clone(),
+            pledge_amount: _150foos.clone(),
            owner: Addr::unchecked("foo1"),
            block_height: 100,
            gateway: gateway_fixture(),
+            proxy: None,
        };

        let gate2 = GatewayBond {
-            bond_amount: _150foos,
+            pledge_amount: _150foos,
            owner: Addr::unchecked("foo2"),
            block_height: 120,
            gateway: gateway_fixture(),
+            proxy: None,
        };

        let gate3 = GatewayBond {
-            bond_amount: _50foos,
+            pledge_amount: _50foos,
            owner: Addr::unchecked("foo3"),
            block_height: 120,
            gateway: gateway_fixture(),
+            proxy: None,
        };

        let gate4 = GatewayBond {
-            bond_amount: _140foos,
+            pledge_amount: _140foos,
            owner: Addr::unchecked("foo4"),
            block_height: 120,
            gateway: gateway_fixture(),
+            proxy: None,
        };

        let gate5 = GatewayBond {
-            bond_amount: _0foos,
+            pledge_amount: _0foos,
            owner: Addr::unchecked("foo5"),
            block_height: 120,
            gateway: gateway_fixture(),
+            proxy: None,
        };

        // summary:
@@ -8,15 +8,14 @@ pub mod mixnode;
 mod msg;
 mod types;

+pub const MIXNODE_DELEGATORS_PAGE_LIMIT: usize = 250;
+
 pub use cosmwasm_std::{Addr, Coin};
 pub use delegation::{
-    Delegation, PagedAllDelegationsResponse, PagedMixDelegationsResponse,
-    PagedReverseMixDelegationsResponse, RawDelegationData, UnpackedDelegation,
+    Delegation, PagedAllDelegationsResponse, PagedDelegatorDelegationsResponse,
+    PagedMixDelegationsResponse,
 };
 pub use gateway::{Gateway, GatewayBond, GatewayOwnershipResponse, PagedGatewayResponse};
 pub use mixnode::{Layer, MixNode, MixNodeBond, MixOwnershipResponse, PagedMixnodeResponse};
-pub use msg::{ExecuteMsg, InstantiateMsg, MigrateMsg, QueryMsg};
-pub use types::{
-    IdentityKey, IdentityKeyRef, LayerDistribution, RewardingIntervalResponse, SphinxKey,
-    StateParams,
-};
+pub use msg::*;
+pub use types::*;
@@ -5,7 +5,7 @@ use crate::{IdentityKey, SphinxKey};
 use az::CheckedCast;
 use cosmwasm_std::{coin, Addr, Coin, Uint128};
 use log::error;
-use network_defaults::{DEFAULT_OPERATOR_EPOCH_COST, DEFAULT_PROFIT_MARGIN};
+use network_defaults::DEFAULT_OPERATOR_EPOCH_COST;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use serde_repr::{Deserialize_repr, Serialize_repr};
@@ -14,6 +14,10 @@ use std::fmt::Display;

 type U128 = fixed::types::U75F53; // u128 with 18 significant digits

+fixed::const_fixed_from_int! {
+    const ONE: U128 = 1;
+}
+
 #[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
 #[derive(Clone, Debug, Deserialize, PartialEq, PartialOrd, Serialize, JsonSchema)]
 pub struct MixNode {
@@ -25,6 +29,7 @@ pub struct MixNode {
    /// Base58 encoded ed25519 EdDSA public key.
    pub identity_key: IdentityKey,
    pub version: String,
+    pub profit_margin_percent: u8,
 }

 #[derive(
@@ -51,32 +56,68 @@ pub enum Layer {
 #[derive(Debug, Clone, JsonSchema, PartialEq, Serialize, Deserialize, Copy)]
 pub struct NodeRewardParams {
    period_reward_pool: Uint128,
-    k: Uint128,
+    rewarded_set_size: Uint128,
+    active_set_size: Uint128,
    reward_blockstamp: u64,
    circulating_supply: Uint128,
    uptime: Uint128,
    sybil_resistance_percent: u8,
+    in_active_set: bool,
+    active_set_work_factor: u8,
 }

 impl NodeRewardParams {
+    #[allow(clippy::too_many_arguments)]
    pub fn new(
        period_reward_pool: u128,
-        k: u128,
+        rewarded_set_size: u128,
+        active_set_size: u128,
        reward_blockstamp: u64,
        circulating_supply: u128,
        uptime: u128,
        sybil_resistance_percent: u8,
+        in_active_set: bool,
+        active_set_work_factor: u8,
    ) -> NodeRewardParams {
        NodeRewardParams {
-            period_reward_pool: Uint128(period_reward_pool),
-            k: Uint128(k),
+            period_reward_pool: Uint128::new(period_reward_pool),
+            rewarded_set_size: Uint128::new(rewarded_set_size),
+            active_set_size: Uint128::new(active_set_size),
            reward_blockstamp,
-            circulating_supply: Uint128(circulating_supply),
-            uptime: Uint128(uptime),
+            circulating_supply: Uint128::new(circulating_supply),
+            uptime: Uint128::new(uptime),
            sybil_resistance_percent,
+            in_active_set,
+            active_set_work_factor,
        }
    }

+    pub fn omega(&self) -> U128 {
+        // As per keybase://chat/nymtech#tokeneconomics/1179
+        let denom = self.active_set_work_factor() * U128::from_num(self.rewarded_set_size())
+            - (self.active_set_work_factor() - ONE) * U128::from_num(self.idle_nodes().u128());
+
+        if self.in_active_set() {
+            // work_active = factor / (factor * self.network.k[month] - (factor - 1) * idle_nodes)
+            self.active_set_work_factor() / denom * self.rewarded_set_size()
+        } else {
+            // work_idle = 1 / (factor * self.network.k[month] - (factor - 1) * idle_nodes)
+            ONE / denom * self.rewarded_set_size()
+        }
+    }
+
+    pub fn idle_nodes(&self) -> Uint128 {
+        self.rewarded_set_size - self.active_set_size
+    }
+
+    pub fn active_set_work_factor(&self) -> U128 {
+        U128::from_num(self.active_set_work_factor)
+    }
+
+    pub fn in_active_set(&self) -> bool {
+        self.in_active_set
+    }
+
    pub fn performance(&self) -> U128 {
        U128::from_num(self.uptime.u128()) / U128::from_num(100)
    }
@@ -93,8 +134,8 @@ impl NodeRewardParams {
        self.period_reward_pool.u128()
    }

-    pub fn k(&self) -> u128 {
-        self.k.u128()
+    pub fn rewarded_set_size(&self) -> u128 {
+        self.rewarded_set_size.u128()
    }

    pub fn circulating_supply(&self) -> u128 {
@@ -110,7 +151,7 @@ impl NodeRewardParams {
    }

    pub fn one_over_k(&self) -> U128 {
-        U128::from_num(1) / U128::from_num(self.k.u128())
+        ONE / U128::from_num(self.rewarded_set_size.u128())
    }

    pub fn alpha(&self) -> U128 {
@@ -118,6 +159,90 @@ impl NodeRewardParams {
    }
 }

+// cosmwasm's limited serde doesn't work with U128 directly
+#[allow(non_snake_case)]
+pub mod fixed_U128_as_string {
+    use super::U128;
+    use serde::de::Error;
+    use serde::Deserialize;
+    use std::str::FromStr;
+
+    pub fn serialize<S>(val: &U128, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        let s = (*val).to_string();
+        serializer.serialize_str(&s)
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<U128, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let s = String::deserialize(deserializer)?;
+        U128::from_str(&s).map_err(|err| {
+            D::Error::custom(format!(
+                "failed to deserialize U128 with its string representation - {}",
+                err
+            ))
+        })
+    }
+}
+
+// everything required to reward delegator of given mixnode
+#[derive(Debug, Clone, Copy, Serialize, Deserialize, JsonSchema)]
+pub struct DelegatorRewardParams {
+    node_reward_params: NodeRewardParams,
+
+    // to be completely honest I don't understand all consequences of using `#[schemars(with = "String")]`
+    // for U128 here, but it seems that CosmWasm is using the same attribute for their Uint128
+    #[schemars(with = "String")]
+    #[serde(with = "fixed_U128_as_string")]
+    sigma: U128,
+    #[schemars(with = "String")]
+    #[serde(with = "fixed_U128_as_string")]
+    profit_margin: U128,
+    #[schemars(with = "String")]
+    #[serde(with = "fixed_U128_as_string")]
+    node_profit: U128,
+}
+
+impl DelegatorRewardParams {
+    pub fn new(mixnode_bond: &MixNodeBond, node_reward_params: NodeRewardParams) -> Self {
+        DelegatorRewardParams {
+            sigma: mixnode_bond.sigma(&node_reward_params),
+            profit_margin: mixnode_bond.profit_margin(),
+            node_profit: mixnode_bond.node_profit(&node_reward_params),
+            node_reward_params,
+        }
+    }
+
+    pub fn determine_delegation_reward(&self, delegation_amount: Uint128) -> u128 {
+        // change all values into their fixed representations
+        let delegation_amount = U128::from_num(delegation_amount.u128());
+        let circulating_supply = U128::from_num(self.node_reward_params.circulating_supply());
+
+        let scaled_delegation_amount = delegation_amount / circulating_supply;
+        let delegator_reward =
+            (ONE - self.profit_margin) * scaled_delegation_amount / self.sigma * self.node_profit;
+
+        let reward = delegator_reward.max(U128::ZERO);
+        if let Some(int_reward) = reward.checked_cast() {
+            int_reward
+        } else {
+            error!(
+                "Could not cast delegator reward ({}) to u128, returning 0",
+                reward,
+            );
+            0u128
+        }
+    }
+
+    pub fn node_reward_params(&self) -> &NodeRewardParams {
+        &self.node_reward_params
+    }
+}
+
 #[derive(Debug)]
 pub struct NodeRewardResult {
    reward: U128,
@@ -141,46 +266,45 @@ impl NodeRewardResult {

 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
 pub struct MixNodeBond {
-    pub bond_amount: Coin,
+    pub pledge_amount: Coin,
    pub total_delegation: Coin,
    pub owner: Addr,
    pub layer: Layer,
    pub block_height: u64,
    pub mix_node: MixNode,
-    pub profit_margin_percent: Option<u8>,
+    pub proxy: Option<Addr>,
 }

 impl MixNodeBond {
    pub fn new(
-        bond_amount: Coin,
+        pledge_amount: Coin,
        owner: Addr,
        layer: Layer,
        block_height: u64,
        mix_node: MixNode,
-        profit_margin_percent: Option<u8>,
+        proxy: Option<Addr>,
    ) -> Self {
        MixNodeBond {
-            total_delegation: coin(0, &bond_amount.denom),
-            bond_amount,
+            total_delegation: coin(0, &pledge_amount.denom),
+            pledge_amount,
            owner,
            layer,
            block_height,
            mix_node,
-            profit_margin_percent,
+            proxy,
        }
    }

    pub fn profit_margin(&self) -> U128 {
-        U128::from_num(self.profit_margin_percent.unwrap_or(DEFAULT_PROFIT_MARGIN))
-            / U128::from_num(100)
+        U128::from_num(self.mix_node.profit_margin_percent) / U128::from_num(100)
    }

    pub fn identity(&self) -> &String {
        &self.mix_node.identity_key
    }

-    pub fn bond_amount(&self) -> Coin {
-        self.bond_amount.clone()
+    pub fn pledge_amount(&self) -> Coin {
+        self.pledge_amount.clone()
    }

    pub fn owner(&self) -> &Addr {
@@ -192,10 +316,10 @@ impl MixNodeBond {
    }

    pub fn total_stake(&self) -> Option<u128> {
-        if self.bond_amount.denom != self.total_delegation.denom {
+        if self.pledge_amount.denom != self.total_delegation.denom {
            None
        } else {
-            Some(self.bond_amount.amount.u128() + self.total_delegation.amount.u128())
+            Some(self.pledge_amount.amount.u128() + self.total_delegation.amount.u128())
        }
    }

@@ -203,39 +327,38 @@ impl MixNodeBond {
        self.total_delegation.clone()
    }

-    pub fn bond_to_circulating_supply(&self, circulating_supply: u128) -> U128 {
-        U128::from_num(self.bond_amount().amount.u128()) / U128::from_num(circulating_supply)
+    pub fn pledge_to_circulating_supply(&self, circulating_supply: u128) -> U128 {
+        U128::from_num(self.pledge_amount().amount.u128()) / U128::from_num(circulating_supply)
    }

-    pub fn total_stake_to_circulating_supply(&self, circulating_supply: u128) -> U128 {
-        U128::from_num(self.bond_amount().amount.u128() + self.total_delegation().amount.u128())
+    pub fn total_bond_to_circulating_supply(&self, circulating_supply: u128) -> U128 {
+        U128::from_num(self.pledge_amount().amount.u128() + self.total_delegation().amount.u128())
            / U128::from_num(circulating_supply)
    }

    pub fn lambda(&self, params: &NodeRewardParams) -> U128 {
        // Ratio of a bond to the token circulating supply
-        let bond_to_circulating_supply_ratio =
-            self.bond_to_circulating_supply(params.circulating_supply());
-        bond_to_circulating_supply_ratio.min(params.one_over_k())
+        let pledge_to_circulating_supply_ratio =
+            self.pledge_to_circulating_supply(params.circulating_supply());
+        pledge_to_circulating_supply_ratio.min(params.one_over_k())
    }

    pub fn sigma(&self, params: &NodeRewardParams) -> U128 {
        // Ratio of a delegation to the the token circulating supply
-        let total_stake_to_circulating_supply_ratio =
-            self.total_stake_to_circulating_supply(params.circulating_supply());
-        total_stake_to_circulating_supply_ratio.min(params.one_over_k())
+        let total_bond_to_circulating_supply_ratio =
+            self.total_bond_to_circulating_supply(params.circulating_supply());
+        total_bond_to_circulating_supply_ratio.min(params.one_over_k())
    }

    pub fn reward(&self, params: &NodeRewardParams) -> NodeRewardResult {
-        // Assuming uniform work distribution across the network this is one_over_k * k
-        let omega_k = U128::from_num(1u128);
        let lambda = self.lambda(params);
        let sigma = self.sigma(params);

        let reward = params.performance()
            * params.period_reward_pool()
-            * (sigma * omega_k + params.alpha() * lambda * sigma * params.k())
-            / (U128::from_num(1) + params.alpha());
+            * (sigma * params.omega()
+                + params.alpha() * lambda * sigma * params.rewarded_set_size())
+            / (ONE + params.alpha());

        NodeRewardResult {
            reward,
@@ -261,7 +384,7 @@ impl MixNodeBond {
        };
        let operator_base_reward = reward.reward.min(params.operator_cost());
        let operator_reward = (self.profit_margin()
-            + (U128::from_num(1) - self.profit_margin()) * reward.lambda / reward.sigma)
+            + (ONE - self.profit_margin()) * reward.lambda / reward.sigma)
            * profit;

        let reward = (operator_reward + operator_base_reward).max(U128::from_num(0));
@@ -279,67 +402,50 @@ impl MixNodeBond {
    }

    pub fn sigma_ratio(&self, params: &NodeRewardParams) -> U128 {
-        if self.total_stake_to_circulating_supply(params.circulating_supply()) < params.one_over_k()
+        if self.total_bond_to_circulating_supply(params.circulating_supply()) < params.one_over_k()
        {
-            self.total_stake_to_circulating_supply(params.circulating_supply())
+            self.total_bond_to_circulating_supply(params.circulating_supply())
        } else {
            params.one_over_k()
        }
    }

    pub fn reward_delegation(&self, delegation_amount: Uint128, params: &NodeRewardParams) -> u128 {
-        let scaled_delegation_amount =
-            U128::from_num(delegation_amount.u128()) / U128::from_num(params.circulating_supply());
-
-        let delegator_reward = (U128::from_num(1) - self.profit_margin())
-            * scaled_delegation_amount
-            / self.sigma(params)
-            * self.node_profit(params);
-
-        let reward = delegator_reward.max(U128::from_num(0));
-        if let Some(int_reward) = reward.checked_cast() {
-            int_reward
-        } else {
-            error!(
-                "Could not cast delegator reward ({}) to u128, returning 0 - mixnode {}",
-                reward,
-                self.identity()
-            );
-            0u128
-        }
+        let reward_params = DelegatorRewardParams::new(self, *params);
+        reward_params.determine_delegation_reward(delegation_amount)
    }
 }

 impl PartialOrd for MixNodeBond {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        // first remove invalid cases
-        if self.bond_amount.denom != self.total_delegation.denom {
+        if self.pledge_amount.denom != self.total_delegation.denom {
            return None;
        }

-        if other.bond_amount.denom != other.total_delegation.denom {
+        if other.pledge_amount.denom != other.total_delegation.denom {
            return None;
        }

-        if self.bond_amount.denom != other.bond_amount.denom {
+        if self.pledge_amount.denom != other.pledge_amount.denom {
            return None;
        }

        // try to order by total bond + delegation
-        let total_cmp = (self.bond_amount.amount + self.total_delegation.amount)
-            .partial_cmp(&(self.bond_amount.amount + self.total_delegation.amount))?;
+        let total_cmp = (self.pledge_amount.amount + self.total_delegation.amount)
+            .partial_cmp(&(self.pledge_amount.amount + self.total_delegation.amount))?;

        if total_cmp != Ordering::Equal {
            return Some(total_cmp);
        }

        // then if those are equal, prefer higher bond over delegation
-        let bond_cmp = self
-            .bond_amount
+        let pledge_cmp = self
+            .pledge_amount
            .amount
-            .partial_cmp(&other.bond_amount.amount)?;
-        if bond_cmp != Ordering::Equal {
-            return Some(bond_cmp);
+            .partial_cmp(&other.pledge_amount.amount)?;
+        if pledge_cmp != Ordering::Equal {
+            return Some(pledge_cmp);
        }

        // then look at delegation (I'm not sure we can get here, but better safe than sorry)
@@ -378,7 +484,10 @@ impl Display for MixNodeBond {
        write!(
            f,
            "amount: {} {}, owner: {}, identity: {}",
-            self.bond_amount.amount, self.bond_amount.denom, self.owner, self.mix_node.identity_key
+            self.pledge_amount.amount,
+            self.pledge_amount.denom,
+            self.owner,
+            self.mix_node.identity_key
        )
    }
 }
@@ -407,7 +516,7 @@ impl PagedMixnodeResponse {
 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
 pub struct MixOwnershipResponse {
    pub address: Addr,
-    pub has_node: bool,
+    pub mixnode: Option<MixNodeBond>,
 }

 #[cfg(test)]
@@ -423,6 +532,7 @@ mod tests {
            sphinx_key: "sphinxkey".to_string(),
            identity_key: "identitykey".to_string(),
            version: "0.11.0".to_string(),
+            profit_margin_percent: 10,
        }
    }

@@ -433,53 +543,53 @@ mod tests {
        let _0foos = Coin::new(0, "foo");

        let mix1 = MixNodeBond {
-            bond_amount: _150foos.clone(),
+            pledge_amount: _150foos.clone(),
            total_delegation: _50foos.clone(),
            owner: Addr::unchecked("foo1"),
            layer: Layer::One,
            block_height: 100,
            mix_node: mixnode_fixture(),
-            profit_margin_percent: Some(10),
+            proxy: None,
        };

        let mix2 = MixNodeBond {
-            bond_amount: _150foos.clone(),
+            pledge_amount: _150foos.clone(),
            total_delegation: _50foos.clone(),
            owner: Addr::unchecked("foo2"),
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
-            profit_margin_percent: Some(10),
+            proxy: None,
        };

        let mix3 = MixNodeBond {
-            bond_amount: _50foos,
+            pledge_amount: _50foos,
            total_delegation: _150foos.clone(),
            owner: Addr::unchecked("foo3"),
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
-            profit_margin_percent: Some(10),
+            proxy: None,
        };

        let mix4 = MixNodeBond {
-            bond_amount: _150foos.clone(),
+            pledge_amount: _150foos.clone(),
            total_delegation: _0foos.clone(),
            owner: Addr::unchecked("foo4"),
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
-            profit_margin_percent: Some(10),
+            proxy: None,
        };

        let mix5 = MixNodeBond {
-            bond_amount: _0foos,
+            pledge_amount: _0foos,
            total_delegation: _150foos,
            owner: Addr::unchecked("foo5"),
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
-            profit_margin_percent: Some(10),
+            proxy: None,
        };

        // summary:
@@ -2,27 +2,30 @@
 // SPDX-License-Identifier: Apache-2.0

 use crate::mixnode::NodeRewardParams;
-use crate::StateParams;
+use crate::ContractStateParams;
 use crate::{Gateway, IdentityKey, MixNode};
-use cosmwasm_std::Addr;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};

 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
-pub struct InstantiateMsg {}
+pub struct InstantiateMsg {
+    pub rewarding_validator_address: String,
+}

 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
 #[serde(rename_all = "snake_case")]
 pub enum ExecuteMsg {
    BondMixnode {
        mix_node: MixNode,
+        owner_signature: String,
    },
    UnbondMixnode {},
    BondGateway {
        gateway: Gateway,
+        owner_signature: String,
    },
    UnbondGateway {},
-    UpdateStateParams(StateParams),
+    UpdateContractStateParams(ContractStateParams),

    DelegateToMixnode {
        mix_identity: IdentityKey,
@@ -37,21 +40,12 @@ pub enum ExecuteMsg {
        rewarding_interval_nonce: u32,
    },

-    RewardMixnode {
-        identity: IdentityKey,
-        // percentage value in range 0-100
-        uptime: u32,
-
-        // nonce of the current rewarding interval
-        rewarding_interval_nonce: u32,
-    },
-
    FinishMixnodeRewarding {
        // nonce of the current rewarding interval
        rewarding_interval_nonce: u32,
    },

-    RewardMixnodeV2 {
+    RewardMixnode {
        identity: IdentityKey,
        // percentage value in range 0-100
        params: NodeRewardParams,
@@ -59,11 +53,41 @@ pub enum ExecuteMsg {
        // nonce of the current rewarding interval
        rewarding_interval_nonce: u32,
    },
+    RewardNextMixDelegators {
+        mix_identity: IdentityKey,
+        // nonce of the current rewarding interval
+        rewarding_interval_nonce: u32,
+    },
+    DelegateToMixnodeOnBehalf {
+        mix_identity: IdentityKey,
+        delegate: String,
+    },
+    UndelegateFromMixnodeOnBehalf {
+        mix_identity: IdentityKey,
+        delegate: String,
+    },
+    BondMixnodeOnBehalf {
+        mix_node: MixNode,
+        owner: String,
+        owner_signature: String,
+    },
+    UnbondMixnodeOnBehalf {
+        owner: String,
+    },
+    BondGatewayOnBehalf {
+        gateway: Gateway,
+        owner: String,
+        owner_signature: String,
+    },
+    UnbondGatewayOnBehalf {
+        owner: String,
+    },
 }

 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
 #[serde(rename_all = "snake_case")]
 pub enum QueryMsg {
+    GetContractVersion {},
    GetMixNodes {
        limit: Option<u32>,
        start_after: Option<IdentityKey>,
@@ -73,36 +97,49 @@ pub enum QueryMsg {
        limit: Option<u32>,
    },
    OwnsMixnode {
-        address: Addr,
+        address: String,
    },
    OwnsGateway {
-        address: Addr,
+        address: String,
    },
    StateParams {},
    CurrentRewardingInterval {},
-    GetMixDelegations {
+    // gets all [paged] delegations in the entire network
+    // TODO: do we even want that?
+    GetAllNetworkDelegations {
+        start_after: Option<(IdentityKey, String)>,
+        limit: Option<u32>,
+    },
+    // gets all [paged] delegations associated with particular mixnode
+    GetMixnodeDelegations {
        mix_identity: IdentityKey,
-        start_after: Option<Addr>,
+        // since `start_after` is user-provided input, we can't use `Addr` as we
+        // can't guarantee it's validated.
+        start_after: Option<String>,
        limit: Option<u32>,
    },
-    GetAllMixDelegations {
-        start_after: Option<Vec<u8>>,
-        limit: Option<u32>,
-    },
-    GetReverseMixDelegations {
-        delegation_owner: Addr,
+    // gets all [paged] delegations associated with particular delegator
+    GetDelegatorDelegations {
+        // since `delegator` is user-provided input, we can't use `Addr` as we
+        // can't guarantee it's validated.
+        delegator: String,
        start_after: Option<IdentityKey>,
        limit: Option<u32>,
    },
-    GetMixDelegation {
+    // gets delegation associated with particular mixnode, delegator pair
+    GetDelegationDetails {
        mix_identity: IdentityKey,
-        address: Addr,
+        delegator: String,
    },
    LayerDistribution {},
    GetRewardPool {},
    GetCirculatingSupply {},
    GetEpochRewardPercent {},
    GetSybilResistancePercent {},
+    GetRewardingStatus {
+        mix_identity: IdentityKey,
+        rewarding_interval_nonce: u32,
+    },
 }

 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
@@ -1,8 +1,9 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

+use crate::mixnode::DelegatorRewardParams;
 use crate::Layer;
-use cosmwasm_std::{Decimal, Uint128};
+use cosmwasm_std::{Addr, Uint128};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use std::fmt::{self, Display, Formatter};
@@ -34,14 +35,13 @@ pub struct RewardingIntervalResponse {
 }

 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
-pub struct StateParams {
-    pub epoch_length: u32, // length of a rewarding epoch/interval, expressed in hours
-
-    pub minimum_mixnode_bond: Uint128, // minimum amount a mixnode must bond to get into the system
-    pub minimum_gateway_bond: Uint128, // minimum amount a gateway must bond to get into the system
-
-    pub mixnode_bond_reward_rate: Decimal, // annual reward rate, expressed as a decimal like 1.25
-    pub mixnode_delegation_reward_rate: Decimal, // annual reward rate, expressed as a decimal like 1.25
+pub struct ContractStateParams {
+    // so currently epoch_length is being unused and validator API performs rewarding
+    // based on its own epoch length config value. I guess that's fine for time being
+    // however, in the future, the contract constant should be controlling it instead.
+    // pub epoch_length: u32, // length of a rewarding epoch/interval, expressed in hours
+    pub minimum_mixnode_pledge: Uint128, // minimum amount a mixnode must pledge to get into the system
+    pub minimum_gateway_pledge: Uint128, // minimum amount a gateway must pledge to get into the system

    // number of mixnode that are going to get rewarded during current rewarding interval (k_m)
    // based on overall demand for private bandwidth-
@@ -50,23 +50,21 @@ pub struct StateParams {
    // subset of rewarded mixnodes that are actively receiving mix traffic
    // used to handle shorter-term (e.g. hourly) fluctuations of demand
    pub mixnode_active_set_size: u32,
+    pub active_set_work_factor: u8,
 }

-impl Display for StateParams {
+impl Display for ContractStateParams {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        write!(f, "Contract state parameters: [ ")?;
-        write!(f, "epoch length: {}; ", self.epoch_length)?;
-        write!(f, "minimum mixnode bond: {}; ", self.minimum_mixnode_bond)?;
-        write!(f, "minimum gateway bond: {}; ", self.minimum_gateway_bond)?;
        write!(
            f,
-            "mixnode bond reward rate: {}; ",
-            self.mixnode_bond_reward_rate
+            "minimum mixnode pledge: {}; ",
+            self.minimum_mixnode_pledge
        )?;
        write!(
            f,
-            "mixnode delegation reward rate: {}; ",
-            self.mixnode_delegation_reward_rate
+            "minimum gateway pledge: {}; ",
+            self.minimum_gateway_pledge
        )?;
        write!(
            f,
@@ -77,10 +75,63 @@ impl Display for StateParams {
            f,
            "mixnode active set size: {}",
            self.mixnode_active_set_size
+        )?;
+        write!(
+            f,
+            "mixnode active set work factor: {}",
+            self.active_set_work_factor
        )
    }
 }

+#[derive(Default, Debug, Serialize, Deserialize, PartialEq)]
+pub struct RewardingResult {
+    pub operator_reward: Uint128,
+    pub total_delegator_reward: Uint128,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct PendingDelegatorRewarding {
+    // keep track of the running rewarding results so we'd known how much was the operator and its delegators rewarded
+    pub running_results: RewardingResult,
+
+    pub next_start: Addr,
+
+    pub rewarding_params: DelegatorRewardParams,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum RewardingStatus {
+    Complete(RewardingResult),
+    PendingNextDelegatorPage(PendingDelegatorRewarding),
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct MixnodeRewardingStatusResponse {
+    pub status: Option<RewardingStatus>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct MixnetContractVersion {
+    // VERGEN_BUILD_TIMESTAMP
+    pub build_timestamp: String,
+
+    // VERGEN_BUILD_SEMVER
+    pub build_version: String,
+
+    // VERGEN_GIT_SHA
+    pub commit_sha: String,
+
+    // VERGEN_GIT_COMMIT_TIMESTAMP
+    pub commit_timestamp: String,
+
+    // VERGEN_GIT_BRANCH
+    pub commit_branch: String,
+
+    // VERGEN_RUSTC_SEMVER
+    pub rustc_version: String,
+}
+
 // type aliases for better reasoning about available data
 pub type IdentityKey = String;
 pub type IdentityKeyRef<'a> = &'a str;
@@ -63,6 +63,7 @@ pub fn default_api_endpoints() -> Vec<Url> {
 }

 pub const DEFAULT_MIXNET_CONTRACT_ADDRESS: &str = "punk10pyejy66429refv3g35g2t7am0was7yalwrzen";
+pub const DEFAULT_VESTING_CONTRACT_ADDRESS: &str = "";
 pub const REWARDING_VALIDATOR_ADDRESS: &str = "punk1v9qauwdq5terag6uvfsdytcs2d0sdmfdy7hgk3";

 /// How much bandwidth (in bytes) one token can buy
@@ -0,0 +1,43 @@
+[package]
+name = "nymcoconut"
+version = "0.5.0"
+authors = ["Jedrzej Stuczynski <andrew@nymtech.net>", "Ania Piotrowska <ania@nymtech.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bls12_381 = { version = "0.5", default-features = false, features = ["pairings", "alloc", "experimental"] }
+itertools = "0.10"
+digest = "0.9"
+rand = "0.8"
+thiserror = "1.0"
+serde = "1.0"
+serde_derive = "1.0"
+bs58 = "0.4.0"
+sha2 = "0.9"
+
+[dependencies.ff]
+version = "0.10"
+default-features = false
+
+[dependencies.group]
+version = "0.10"
+default-features = false
+
+[dev-dependencies]
+criterion = { version="0.3", features=["html_reports"] }
+doc-comment = "0.3"
+
+[dev-dependencies.bincode]
+version = "1"
+
+#[[bench]]
+#name = "benchmarks"
+#harness = false
+
+[features]
+default = []
+
+[target.'cfg(target_env = "wasm32-unknown-unknown")'.dependencies]
+getrandom = { version="0.2", features=["js"] }
@@ -0,0 +1,322 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use core::ops::{Deref, Mul};
+use std::convert::TryFrom;
+use std::convert::TryInto;
+
+use bls12_381::{G1Projective, Scalar};
+use group::Curve;
+use serde_derive::{Deserialize, Serialize};
+
+use crate::error::{CoconutError, Result};
+use crate::scheme::setup::Parameters;
+use crate::traits::{Base58, Bytable};
+use crate::utils::{try_deserialize_g1_projective, try_deserialize_scalar};
+
+/// Type alias for the ephemeral key generated during ElGamal encryption
+pub type EphemeralKey = Scalar;
+
+/// Two G1 points representing ElGamal ciphertext
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct Ciphertext(pub(crate) G1Projective, pub(crate) G1Projective);
+
+impl TryFrom<&[u8]> for Ciphertext {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<Ciphertext> {
+        if bytes.len() != 96 {
+            return Err(CoconutError::Deserialization(format!(
+                "Ciphertext must be exactly 96 bytes, got {}",
+                bytes.len()
+            )));
+        }
+
+        let c1_bytes: &[u8; 48] = &bytes[..48].try_into().unwrap();
+        let c2_bytes: &[u8; 48] = &bytes[48..].try_into().unwrap();
+
+        let c1 = try_deserialize_g1_projective(
+            c1_bytes,
+            CoconutError::Deserialization("Failed to deserialize compressed c1".to_string()),
+        )?;
+        let c2 = try_deserialize_g1_projective(
+            c2_bytes,
+            CoconutError::Deserialization("Failed to deserialize compressed c2".to_string()),
+        )?;
+
+        Ok(Ciphertext(c1, c2))
+    }
+}
+
+impl Ciphertext {
+    pub fn c1(&self) -> &G1Projective {
+        &self.0
+    }
+
+    pub fn c2(&self) -> &G1Projective {
+        &self.1
+    }
+
+    pub fn to_bytes(&self) -> [u8; 96] {
+        let mut bytes = [0u8; 96];
+        bytes[..48].copy_from_slice(&self.0.to_affine().to_compressed());
+        bytes[48..].copy_from_slice(&self.1.to_affine().to_compressed());
+        bytes
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<Ciphertext> {
+        Ciphertext::try_from(bytes)
+    }
+}
+
+/// PrivateKey used in the ElGamal encryption scheme to recover the plaintext
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct PrivateKey(pub(crate) Scalar);
+
+impl PrivateKey {
+    /// Decrypt takes the ElGamal encryption of a message and returns a point on the G1 curve
+    /// that represents original h^m.
+    pub fn decrypt(&self, ciphertext: &Ciphertext) -> G1Projective {
+        let (c1, c2) = &(ciphertext.0, ciphertext.1);
+
+        // (gamma^k * h^m) / (g1^{d * k})   |   note: gamma = g1^d
+        c2 - c1 * self.0
+    }
+
+    pub fn public_key(&self, params: &Parameters) -> PublicKey {
+        PublicKey(params.gen1() * self.0)
+    }
+
+    pub fn to_bytes(&self) -> [u8; 32] {
+        self.0.to_bytes()
+    }
+
+    pub fn from_bytes(bytes: &[u8; 32]) -> Result<PrivateKey> {
+        try_deserialize_scalar(
+            bytes,
+            CoconutError::Deserialization(
+                "Failed to deserialize ElGamal private key - it was not in the canonical form"
+                    .to_string(),
+            ),
+        )
+        .map(PrivateKey)
+    }
+}
+
+impl Bytable for PrivateKey {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.to_bytes().to_vec()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        PrivateKey::from_bytes(slice.try_into().unwrap())
+    }
+}
+
+impl Base58 for PrivateKey {}
+
+// TODO: perhaps be more explicit and apart from gamma also store generator and group order?
+/// PublicKey used in the ElGamal encryption scheme to produce the ciphertext
+#[derive(Debug, Clone)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct PublicKey(G1Projective);
+
+impl PublicKey {
+    /// Encrypt encrypts the given message in the form of h^m,
+    /// where h is a point on the G1 curve using the given public key.
+    /// The random k is returned alongside the encryption
+    /// as it is required by the Coconut Scheme to create proofs of knowledge.
+    pub fn encrypt(
+        &self,
+        params: &Parameters,
+        h: &G1Projective,
+        msg: &Scalar,
+    ) -> (Ciphertext, EphemeralKey) {
+        let k = params.random_scalar();
+        // c1 = g1^k
+        let c1 = params.gen1() * k;
+        // c2 = gamma^k * h^m
+        let c2 = self.0 * k + h * msg;
+
+        (Ciphertext(c1, c2), k)
+    }
+
+    pub fn to_bytes(&self) -> [u8; 48] {
+        self.to_byte_vec().try_into().unwrap()
+    }
+
+    pub fn from_bytes(bytes: &[u8; 48]) -> Result<PublicKey> {
+        Ok(PublicKey::try_from(bytes.to_vec().as_slice()).unwrap())
+    }
+}
+
+impl Bytable for PublicKey {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.0.to_affine().to_compressed().into()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        Ok(PublicKey::from_bytes(slice.try_into().unwrap()).unwrap())
+    }
+}
+
+impl TryFrom<&[u8]> for PublicKey {
+    type Error = CoconutError;
+
+    fn try_from(slice: &[u8]) -> Result<PublicKey> {
+        try_deserialize_g1_projective(
+            slice.try_into().unwrap(),
+            CoconutError::Deserialization(
+                "Failed to deserialize compressed ElGamal public key".to_string(),
+            ),
+        )
+        .map(PublicKey)
+    }
+}
+
+impl Base58 for PublicKey {}
+
+impl Deref for PublicKey {
+    type Target = G1Projective;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl<'a, 'b> Mul<&'b Scalar> for &'a PublicKey {
+    type Output = G1Projective;
+
+    fn mul(self, rhs: &'b Scalar) -> Self::Output {
+        self.0 * rhs
+    }
+}
+
+#[derive(Serialize, Deserialize)]
+/// A convenient wrapper for both keys of the ElGamal keypair
+pub struct ElGamalKeyPair {
+    private_key: PrivateKey,
+    public_key: PublicKey,
+}
+
+impl ElGamalKeyPair {
+    pub fn public_key(&self) -> &PublicKey {
+        &self.public_key
+    }
+
+    pub fn private_key(&self) -> &PrivateKey {
+        &self.private_key
+    }
+}
+
+/// Generate a fresh ElGamal keypair using the group generator specified by the provided [Parameters]
+pub fn elgamal_keygen(params: &Parameters) -> ElGamalKeyPair {
+    let private_key = params.random_scalar();
+    let gamma = params.gen1() * private_key;
+
+    ElGamalKeyPair {
+        private_key: PrivateKey(private_key),
+        public_key: PublicKey(gamma),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn keygen() {
+        let params = Parameters::default();
+        let keypair = super::elgamal_keygen(&params);
+
+        let expected = params.gen1() * keypair.private_key.0;
+        let gamma = keypair.public_key.0;
+        assert_eq!(
+            expected, gamma,
+            "Public key, gamma, should be equal to g1^d, where d is the private key"
+        );
+    }
+
+    #[test]
+    fn encryption() {
+        let params = Parameters::default();
+        let keypair = super::elgamal_keygen(&params);
+
+        let r = params.random_scalar();
+        let h = params.gen1() * r;
+        let m = params.random_scalar();
+
+        let (ciphertext, ephemeral_key) = keypair.public_key.encrypt(&params, &h, &m);
+
+        let expected_c1 = params.gen1() * ephemeral_key;
+        assert_eq!(expected_c1, ciphertext.0, "c1 should be equal to g1^k");
+
+        let expected_c2 = keypair.public_key.0 * ephemeral_key + h * m;
+        assert_eq!(
+            expected_c2, ciphertext.1,
+            "c2 should be equal to gamma^k * h^m"
+        );
+    }
+
+    #[test]
+    fn decryption() {
+        let params = Parameters::default();
+        let keypair = super::elgamal_keygen(&params);
+
+        let r = params.random_scalar();
+        let h = params.gen1() * r;
+        let m = params.random_scalar();
+
+        let (ciphertext, _) = keypair.public_key.encrypt(&params, &h, &m);
+        let dec = keypair.private_key.decrypt(&ciphertext);
+
+        let expected = h * m;
+        assert_eq!(
+            expected, dec,
+            "after ElGamal decryption, original h^m should be obtained"
+        );
+    }
+
+    #[test]
+    fn private_key_bytes_roundtrip() {
+        let params = Parameters::default();
+        let private_key = PrivateKey(params.random_scalar());
+        let bytes = private_key.to_bytes();
+
+        // also make sure it is equivalent to the internal scalar's bytes
+        assert_eq!(private_key.0.to_bytes(), bytes);
+        assert_eq!(private_key, PrivateKey::from_bytes(&bytes).unwrap())
+    }
+
+    #[test]
+    fn public_key_bytes_roundtrip() {
+        let params = Parameters::default();
+        let r = params.random_scalar();
+        let public_key = PublicKey(params.gen1() * r);
+        let bytes = public_key.to_bytes();
+
+        // also make sure it is equivalent to the internal g1 compressed bytes
+        assert_eq!(public_key.0.to_affine().to_compressed(), bytes);
+        assert_eq!(public_key, PublicKey::from_bytes(&bytes).unwrap())
+    }
+
+    #[test]
+    fn ciphertext_bytes_roundtrip() {
+        let params = Parameters::default();
+        let r = params.random_scalar();
+        let s = params.random_scalar();
+        let ciphertext = Ciphertext(params.gen1() * r, params.gen1() * s);
+        let bytes = ciphertext.to_bytes();
+
+        // also make sure it is equivalent to the internal g1 compressed bytes concatenated
+        let expected_bytes = [
+            ciphertext.0.to_affine().to_compressed(),
+            ciphertext.1.to_affine().to_compressed(),
+        ]
+        .concat();
+        assert_eq!(expected_bytes, bytes);
+        assert_eq!(ciphertext, Ciphertext::try_from(&bytes[..]).unwrap())
+    }
+}
@@ -0,0 +1,53 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use thiserror::Error;
+
+/// A `Result` alias where the `Err` case is `coconut_rs::Error`.
+pub type Result<T> = std::result::Result<T, CoconutError>;
+
+#[derive(Error, Debug)]
+pub enum CoconutError {
+    #[error("Setup error: {0}")]
+    Setup(String),
+
+    #[error("encountered error during keygen")]
+    Keygen,
+
+    #[error("Issuance related error: {0}")]
+    Issuance(String),
+
+    #[error("Tried to prepare blind sign request for higher than specified number of attributes (max: {}, requested: {})", max, requested)]
+    IssuanceMaxAttributes { max: usize, requested: usize },
+
+    #[error("Interpolation error: {0}")]
+    Interpolation(String),
+
+    #[error("Aggregation error: {0}")]
+    Aggregation(String),
+
+    #[error("Unblind error: {0}")]
+    Unblind(String),
+
+    #[error("Verification error: {0}")]
+    Verification(String),
+
+    #[error("Deserialization error: {0}")]
+    Deserialization(String),
+
+    #[error(
+        "Deserailization error, expected at least {} bytes, got {}",
+        min,
+        actual
+    )]
+    DeserializationMinLength { min: usize, actual: usize },
+
+    #[error("Tried to deserialize {object} with bytes of invalid length. Expected {actual} < {} or {modulus_target} % {modulus} == 0")]
+    DeserializationInvalidLength {
+        actual: usize,
+        target: usize,
+        modulus_target: usize,
+        modulus: usize,
+        object: String,
+    },
+}
@@ -0,0 +1,15 @@
+use crate::{BlindSignRequest, BlindedSignature, Bytable, Theta};
+
+macro_rules! impl_clone {
+    ($struct:ident) => {
+        impl Clone for $struct {
+            fn clone(&self) -> Self {
+                Self::try_from_byte_slice(&self.to_byte_vec()).unwrap()
+            }
+        }
+    };
+}
+
+impl_clone!(BlindSignRequest);
+impl_clone!(BlindedSignature);
+impl_clone!(Theta);
@@ -0,0 +1,2 @@
+mod clone;
+mod serde;
@@ -0,0 +1,56 @@
+use crate::elgamal::PrivateKey;
+use crate::scheme::SecretKey;
+use crate::{
+    Base58, BlindSignRequest, BlindedSignature, PublicKey, Signature, Theta, VerificationKey,
+};
+use serde::de::Unexpected;
+use serde::{de::Error, de::Visitor, Deserialize, Deserializer, Serialize, Serializer};
+use std::fmt;
+
+macro_rules! impl_serde {
+    ($struct:ident, $visitor:ident) => {
+        pub struct $visitor {}
+
+        impl Serialize for $struct {
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+            where
+                S: Serializer,
+            {
+                serializer.serialize_str(&self.to_bs58())
+            }
+        }
+
+        impl<'de> Visitor<'de> for $visitor {
+            type Value = $struct;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                write!(formatter, "A base58 encoded struct")
+            }
+
+            fn visit_str<E: Error>(self, s: &str) -> Result<Self::Value, E> {
+                match $struct::try_from_bs58(s) {
+                    Ok(x) => Ok(x),
+                    Err(_) => Err(Error::invalid_value(Unexpected::Str(s), &self)),
+                }
+            }
+        }
+
+        impl<'de> Deserialize<'de> for $struct {
+            fn deserialize<D>(deserializer: D) -> Result<$struct, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                deserializer.deserialize_str($visitor {})
+            }
+        }
+    };
+}
+
+impl_serde!(SecretKey, V1);
+impl_serde!(VerificationKey, V2);
+impl_serde!(PublicKey, V3);
+impl_serde!(PrivateKey, V4);
+impl_serde!(BlindSignRequest, V5);
+impl_serde!(BlindedSignature, V6);
+impl_serde!(Signature, V7);
+impl_serde!(Theta, V8);
@@ -0,0 +1,57 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use std::convert::TryInto;
+
+use bls12_381::Scalar;
+
+pub use elgamal::elgamal_keygen;
+pub use elgamal::ElGamalKeyPair;
+pub use elgamal::PublicKey;
+pub use error::CoconutError;
+pub use scheme::aggregation::aggregate_signature_shares;
+pub use scheme::aggregation::aggregate_verification_keys;
+pub use scheme::issuance::blind_sign;
+pub use scheme::issuance::prepare_blind_sign;
+pub use scheme::issuance::BlindSignRequest;
+pub use scheme::keygen::ttp_keygen;
+pub use scheme::keygen::KeyPair;
+pub use scheme::keygen::VerificationKey;
+pub use scheme::setup::setup;
+pub use scheme::setup::Parameters;
+pub use scheme::verification::prove_bandwidth_credential;
+pub use scheme::verification::verify_credential;
+pub use scheme::verification::Theta;
+pub use scheme::BlindedSignature;
+pub use scheme::Signature;
+pub use scheme::SignatureShare;
+pub use traits::Base58;
+pub use utils::hash_to_scalar;
+
+use crate::traits::Bytable;
+
+pub mod elgamal;
+mod error;
+mod impls;
+mod proofs;
+mod scheme;
+#[cfg(test)]
+mod tests;
+mod traits;
+mod utils;
+
+pub type Attribute = Scalar;
+pub type PrivateAttribute = Attribute;
+pub type PublicAttribute = Attribute;
+
+impl Bytable for Attribute {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.to_bytes().to_vec()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self, CoconutError> {
+        Ok(Attribute::from_bytes(slice.try_into().unwrap()).unwrap())
+    }
+}
+
+impl Base58 for Attribute {}
@@ -0,0 +1,663 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+// TODO: look at https://crates.io/crates/merlin to perhaps use it instead?
+
+use std::borrow::Borrow;
+use std::convert::TryInto;
+
+use bls12_381::{G1Projective, G2Projective, Scalar};
+use digest::generic_array::typenum::Unsigned;
+use digest::Digest;
+use group::GroupEncoding;
+use itertools::izip;
+use sha2::Sha256;
+
+use crate::elgamal::Ciphertext;
+use crate::error::{CoconutError, Result};
+use crate::scheme::setup::Parameters;
+use crate::scheme::VerificationKey;
+use crate::utils::{hash_g1, try_deserialize_scalar, try_deserialize_scalar_vec};
+use crate::{elgamal, Attribute, ElGamalKeyPair};
+
+// as per the reference python implementation
+type ChallengeDigest = Sha256;
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct ProofCmCs {
+    challenge: Scalar,
+    response_opening: Scalar,
+    response_private_elgamal_key: Scalar,
+    response_keys: Vec<Scalar>,
+    response_attributes: Vec<Scalar>,
+}
+
+// note: this is slightly different from the reference python implementation
+// as we omit the unnecessary string conversion. Instead we concatenate byte
+// representations together and hash that.
+// note2: G1 and G2 elements are using their compressed representations
+// and as per the bls12-381 library all elements are using big-endian form
+/// Generates a Scalar [or Fp] challenge by hashing a number of elliptic curve points.  
+fn compute_challenge<D, I, B>(iter: I) -> Scalar
+where
+    D: Digest,
+    I: Iterator<Item = B>,
+    B: AsRef<[u8]>,
+{
+    let mut h = D::new();
+    for point_representation in iter {
+        h.update(point_representation);
+    }
+    let digest = h.finalize();
+
+    // TODO: I don't like the 0 padding here (though it's what we've been using before,
+    // but we never had a security audit anyway...)
+    // instead we could maybe use the `from_bytes` variant and adding some suffix
+    // when computing the digest until we produce a valid scalar.
+    let mut bytes = [0u8; 64];
+    let pad_size = 64usize
+        .checked_sub(D::OutputSize::to_usize())
+        .unwrap_or_default();
+
+    bytes[pad_size..].copy_from_slice(&digest);
+
+    Scalar::from_bytes_wide(&bytes)
+}
+
+fn produce_response(witness: &Scalar, challenge: &Scalar, secret: &Scalar) -> Scalar {
+    witness - challenge * secret
+}
+
+// note: it's caller's responsibility to ensure witnesses.len() = secrets.len()
+fn produce_responses<S>(witnesses: &[Scalar], challenge: &Scalar, secrets: &[S]) -> Vec<Scalar>
+where
+    S: Borrow<Scalar>,
+{
+    debug_assert_eq!(witnesses.len(), secrets.len());
+
+    witnesses
+        .iter()
+        .zip(secrets.iter())
+        .map(|(w, x)| produce_response(w, challenge, x.borrow()))
+        .collect()
+}
+
+impl ProofCmCs {
+    /// Construct non-interactive zero-knowledge proof of correctness of the ciphertexts and the commitment
+    /// using the Fiat-Shamir heuristic.
+    pub(crate) fn construct(
+        params: &Parameters,
+        elgamal_keypair: &ElGamalKeyPair,
+        ephemeral_keys: &[elgamal::EphemeralKey],
+        commitment: &G1Projective,
+        commitment_opening: &Scalar,
+        private_attributes: &[Attribute],
+        priv_attributes_ciphertexts: &[Ciphertext],
+    ) -> Self {
+        // note: this is only called from `prepare_blind_sign` that already checks
+        // whether private attributes are non-empty and whether we don't have too many
+        // attributes in total to sign.
+        // we also know, due to the single call place, that ephemeral_keys.len() == private_attributes.len()
+
+        // witness creation
+
+        let witness_commitment_opening = params.random_scalar();
+        let witness_private_elgamal_key = params.random_scalar();
+        let witness_keys = params.n_random_scalars(ephemeral_keys.len());
+        let witness_attributes = params.n_random_scalars(private_attributes.len());
+
+        // recompute h
+        let h = hash_g1(commitment.to_bytes());
+        let hs_bytes = params
+            .gen_hs()
+            .iter()
+            .map(|h| h.to_bytes())
+            .collect::<Vec<_>>();
+
+        let g1 = params.gen1();
+
+        // compute commitments
+        let commitment_private_key_elgamal = g1 * witness_private_elgamal_key;
+
+        // Aw[i] = (wk[i] * g1)
+        let commitment_keys1_bytes = witness_keys
+            .iter()
+            .map(|wk_i| g1 * wk_i)
+            .map(|witness| witness.to_bytes())
+            .collect::<Vec<_>>();
+
+        // Bw[i] = (wm[i] * h) + (wk[i] * gamma)
+        let commitment_keys2_bytes = witness_keys
+            .iter()
+            .zip(witness_attributes.iter())
+            .map(|(wk_i, wm_i)| elgamal_keypair.public_key() * wk_i + h * wm_i)
+            .map(|witness| witness.to_bytes())
+            .collect::<Vec<_>>();
+
+        // zkp commitment for the attributes commitment cm
+        // Ccm = (wr * g1) + (wm[0] * hs[0]) + ... + (wm[i] * hs[i])
+        let commitment_attributes = g1 * witness_commitment_opening
+            + witness_attributes
+                .iter()
+                .zip(params.gen_hs().iter())
+                .map(|(wm_i, hs_i)| hs_i * wm_i)
+                .sum::<G1Projective>();
+
+        let ciphertexts_bytes = priv_attributes_ciphertexts
+            .iter()
+            .map(|c| c.to_bytes())
+            .collect::<Vec<_>>();
+
+        // compute challenge
+        let challenge = compute_challenge::<ChallengeDigest, _, _>(
+            std::iter::once(params.gen1().to_bytes().as_ref())
+                .chain(hs_bytes.iter().map(|hs| hs.as_ref()))
+                .chain(std::iter::once(h.to_bytes().as_ref()))
+                .chain(std::iter::once(
+                    elgamal_keypair.public_key().to_bytes().as_ref(),
+                ))
+                .chain(std::iter::once(commitment.to_bytes().as_ref()))
+                .chain(std::iter::once(commitment_attributes.to_bytes().as_ref()))
+                .chain(std::iter::once(
+                    commitment_private_key_elgamal.to_bytes().as_ref(),
+                ))
+                .chain(commitment_keys1_bytes.iter().map(|aw| aw.as_ref()))
+                .chain(commitment_keys2_bytes.iter().map(|bw| bw.as_ref()))
+                .chain(ciphertexts_bytes.iter().map(|c| c.as_ref())),
+        );
+
+        // Responses
+        let response_opening =
+            produce_response(&witness_commitment_opening, &challenge, commitment_opening);
+        let response_private_elgamal_key = produce_response(
+            &witness_private_elgamal_key,
+            &challenge,
+            &elgamal_keypair.private_key().0,
+        );
+        let response_keys = produce_responses(&witness_keys, &challenge, ephemeral_keys);
+        let response_attributes = produce_responses(
+            &witness_attributes,
+            &challenge,
+            &private_attributes.iter().collect::<Vec<_>>(),
+        );
+
+        ProofCmCs {
+            challenge,
+            response_opening,
+            response_private_elgamal_key,
+            response_keys,
+            response_attributes,
+        }
+    }
+
+    pub(crate) fn verify(
+        &self,
+        params: &Parameters,
+        pub_key: &elgamal::PublicKey,
+        commitment: &G1Projective,
+        attributes_ciphertexts: &[elgamal::Ciphertext],
+    ) -> bool {
+        if self.response_keys.len() != attributes_ciphertexts.len() {
+            return false;
+        }
+
+        // recompute h
+        let h = hash_g1(commitment.to_bytes());
+        let g1 = params.gen1();
+
+        let hs_bytes = params
+            .gen_hs()
+            .iter()
+            .map(|h| h.to_bytes())
+            .collect::<Vec<_>>();
+
+        // recompute witnesses commitments
+        let commitment_private_key_elgamal =
+            pub_key * &self.challenge + g1 * self.response_private_elgamal_key;
+
+        // Aw[i] = (c * c1[i]) + (rk[i] * g1)
+        let commitment_keys1_bytes = attributes_ciphertexts
+            .iter()
+            .map(|ciphertext| ciphertext.c1())
+            .zip(self.response_keys.iter())
+            .map(|(c1, res_k)| c1 * self.challenge + g1 * res_k)
+            .map(|witness| witness.to_bytes())
+            .collect::<Vec<_>>();
+
+        // Bw[i] = (c * c2[i]) + (rk[i] * gamma) + (rm[i] * h)
+        let commitment_keys2_bytes = izip!(
+            attributes_ciphertexts
+                .iter()
+                .map(|ciphertext| ciphertext.c2()),
+            self.response_keys.iter(),
+            self.response_attributes.iter()
+        )
+        .map(|(c2, res_key, res_attr)| c2 * self.challenge + pub_key * res_key + h * res_attr)
+        .map(|witness| witness.to_bytes())
+        .collect::<Vec<_>>();
+
+        // Cw = (cm * c) + (rr * g1) + (rm[0] * hs[0]) + ... + (rm[n] * hs[n])
+        let commitment_attributes = commitment * self.challenge
+            + g1 * self.response_opening
+            + self
+                .response_attributes
+                .iter()
+                .zip(params.gen_hs().iter())
+                .map(|(res_attr, hs)| hs * res_attr)
+                .sum::<G1Projective>();
+
+        let ciphertexts_bytes = attributes_ciphertexts
+            .iter()
+            .map(|c| c.to_bytes())
+            .collect::<Vec<_>>();
+
+        // re-compute the challenge
+        let challenge = compute_challenge::<ChallengeDigest, _, _>(
+            std::iter::once(params.gen1().to_bytes().as_ref())
+                .chain(hs_bytes.iter().map(|hs| hs.as_ref()))
+                .chain(std::iter::once(h.to_bytes().as_ref()))
+                .chain(std::iter::once(pub_key.to_bytes().as_ref()))
+                .chain(std::iter::once(commitment.to_bytes().as_ref()))
+                .chain(std::iter::once(commitment_attributes.to_bytes().as_ref()))
+                .chain(std::iter::once(
+                    commitment_private_key_elgamal.to_bytes().as_ref(),
+                ))
+                .chain(commitment_keys1_bytes.iter().map(|aw| aw.as_ref()))
+                .chain(commitment_keys2_bytes.iter().map(|bw| bw.as_ref()))
+                .chain(ciphertexts_bytes.iter().map(|c| c.as_ref())),
+        );
+
+        challenge == self.challenge
+    }
+
+    // challenge || response opening || response private elgamal key || keys len || response keys || attributes len || response attributes
+    pub(crate) fn to_bytes(&self) -> Vec<u8> {
+        let keys_len = self.response_keys.len() as u64;
+        let attributes_len = self.response_attributes.len() as u64;
+
+        let mut bytes = Vec::with_capacity(16 + (keys_len + attributes_len + 3) as usize * 32);
+
+        bytes.extend_from_slice(&self.challenge.to_bytes());
+        bytes.extend_from_slice(&self.response_opening.to_bytes());
+        bytes.extend_from_slice(&self.response_private_elgamal_key.to_bytes());
+        bytes.extend_from_slice(&keys_len.to_le_bytes());
+
+        for rk in &self.response_keys {
+            bytes.extend_from_slice(&rk.to_bytes());
+        }
+
+        bytes.extend_from_slice(&attributes_len.to_le_bytes());
+
+        for rm in &self.response_attributes {
+            bytes.extend_from_slice(&rm.to_bytes());
+        }
+
+        bytes
+    }
+
+    pub(crate) fn from_bytes(bytes: &[u8]) -> Result<Self> {
+        // at the very minimum there must be a single attribute being proven
+        if bytes.len() < 32 * 5 + 16 || (bytes.len() - 16) % 32 != 0 {
+            return Err(
+                CoconutError::Deserialization(
+                    "tried to deserialize proof of ciphertexts and commitment with bytes of invalid length".to_string())
+            );
+        }
+
+        let mut idx = 0;
+        let challenge_bytes = bytes[idx..idx + 32].try_into().unwrap();
+        idx += 32;
+        let response_opening_bytes = bytes[idx..idx + 32].try_into().unwrap();
+        idx += 32;
+        let response_private_elgamal_key_bytes = bytes[idx..idx + 32].try_into().unwrap();
+        idx += 32;
+
+        let challenge = try_deserialize_scalar(
+            &challenge_bytes,
+            CoconutError::Deserialization("Failed to deserialize challenge".to_string()),
+        )?;
+        let response_opening = try_deserialize_scalar(
+            &response_opening_bytes,
+            CoconutError::Deserialization(
+                "Failed to deserialize the response to the random".to_string(),
+            ),
+        )?;
+        let response_private_elgamal_key = try_deserialize_scalar(
+            &response_private_elgamal_key_bytes,
+            CoconutError::Deserialization(
+                "Failed to deserialize the response to the private ElGamal key".to_string(),
+            ),
+        )?;
+
+        let rk_len = u64::from_le_bytes(bytes[idx..idx + 8].try_into().unwrap());
+        idx += 8;
+        if bytes[idx..].len() < rk_len as usize * 32 + 8 {
+            return Err(
+                CoconutError::Deserialization(
+                    "tried to deserialize proof of ciphertexts and commitment with insufficient number of bytes provided".to_string()),
+            );
+        }
+
+        let rk_end = idx + rk_len as usize * 32;
+        let response_keys = try_deserialize_scalar_vec(
+            rk_len,
+            &bytes[idx..rk_end],
+            CoconutError::Deserialization("Failed to deserialize keys response".to_string()),
+        )?;
+
+        let rm_len = u64::from_le_bytes(bytes[rk_end..rk_end + 8].try_into().unwrap());
+        let response_attributes = try_deserialize_scalar_vec(
+            rm_len,
+            &bytes[rk_end + 8..],
+            CoconutError::Deserialization("Failed to deserialize attributes response".to_string()),
+        )?;
+
+        Ok(ProofCmCs {
+            challenge,
+            response_opening,
+            response_private_elgamal_key,
+            response_keys,
+            response_attributes,
+        })
+    }
+}
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct ProofKappaZeta {
+    // c
+    challenge: Scalar,
+
+    // responses
+    response_serial_number: Scalar,
+    response_binding_number: Scalar,
+    response_blinder: Scalar,
+}
+
+impl ProofKappaZeta {
+    pub(crate) fn construct(
+        params: &Parameters,
+        verification_key: &VerificationKey,
+        serial_number: &Attribute,
+        binding_number: &Attribute,
+        blinding_factor: &Scalar,
+        blinded_message: &G2Projective,
+        blinded_serial_number: &G2Projective,
+    ) -> Self {
+        // create the witnesses
+        let witness_blinder = params.random_scalar();
+        let witness_serial_number = params.random_scalar();
+        let witness_binding_number = params.random_scalar();
+        let witness_attributes = vec![witness_serial_number, witness_binding_number];
+
+        let beta_bytes = verification_key
+            .beta
+            .iter()
+            .map(|beta_i| beta_i.to_bytes())
+            .collect::<Vec<_>>();
+
+        // witnesses commitments
+        // Aw = g2 * wt + alpha + beta[0] * wm[0] + ... + beta[i] * wm[i]
+        let commitment_kappa = params.gen2() * witness_blinder
+            + verification_key.alpha
+            + witness_attributes
+                .iter()
+                .zip(verification_key.beta.iter())
+                .map(|(wm_i, beta_i)| beta_i * wm_i)
+                .sum::<G2Projective>();
+
+        // zeta is the public value associated with the serial number
+        let commitment_zeta = params.gen2() * witness_serial_number;
+
+        let challenge = compute_challenge::<ChallengeDigest, _, _>(
+            std::iter::once(params.gen2().to_bytes().as_ref())
+                .chain(std::iter::once(blinded_message.to_bytes().as_ref()))
+                .chain(std::iter::once(blinded_serial_number.to_bytes().as_ref()))
+                .chain(std::iter::once(verification_key.alpha.to_bytes().as_ref()))
+                .chain(beta_bytes.iter().map(|b| b.as_ref()))
+                .chain(std::iter::once(commitment_kappa.to_bytes().as_ref()))
+                .chain(std::iter::once(commitment_zeta.to_bytes().as_ref())),
+        );
+
+        // responses
+        let response_blinder = produce_response(&witness_blinder, &challenge, blinding_factor);
+        let response_serial_number =
+            produce_response(&witness_serial_number, &challenge, serial_number);
+        let response_binding_number =
+            produce_response(&witness_binding_number, &challenge, binding_number);
+
+        ProofKappaZeta {
+            challenge,
+            response_serial_number,
+            response_binding_number,
+            response_blinder,
+        }
+    }
+
+    pub(crate) fn private_attributes_len(&self) -> usize {
+        2
+    }
+
+    pub(crate) fn verify(
+        &self,
+        params: &Parameters,
+        verification_key: &VerificationKey,
+        kappa: &G2Projective,
+        zeta: &G2Projective,
+    ) -> bool {
+        let beta_bytes = verification_key
+            .beta
+            .iter()
+            .map(|beta_i| beta_i.to_bytes())
+            .collect::<Vec<_>>();
+
+        let response_attributes = vec![self.response_serial_number, self.response_binding_number];
+        // re-compute witnesses commitments
+        // Aw = (c * kappa) + (rt * g2) + ((1 - c) * alpha) + (rm[0] * beta[0]) + ... + (rm[i] * beta[i])
+        let commitment_kappa = kappa * self.challenge
+            + params.gen2() * self.response_blinder
+            + verification_key.alpha * (Scalar::one() - self.challenge)
+            + response_attributes
+                .iter()
+                .zip(verification_key.beta.iter())
+                .map(|(priv_attr, beta_i)| beta_i * priv_attr)
+                .sum::<G2Projective>();
+
+        // zeta is the public value associated with the serial number
+        let commitment_zeta = zeta * self.challenge + params.gen2() * self.response_serial_number;
+
+        // compute the challenge
+        let challenge = compute_challenge::<ChallengeDigest, _, _>(
+            std::iter::once(params.gen2().to_bytes().as_ref())
+                .chain(std::iter::once(kappa.to_bytes().as_ref()))
+                .chain(std::iter::once(zeta.to_bytes().as_ref()))
+                .chain(std::iter::once(verification_key.alpha.to_bytes().as_ref()))
+                .chain(beta_bytes.iter().map(|b| b.as_ref()))
+                .chain(std::iter::once(commitment_kappa.to_bytes().as_ref()))
+                .chain(std::iter::once(commitment_zeta.to_bytes().as_ref())),
+        );
+
+        challenge == self.challenge
+    }
+
+    // challenge || response serial number || response binding number || repose blinder
+    pub(crate) fn to_bytes(&self) -> Vec<u8> {
+        let attributes_len = 2; // because we have serial number and the binding number
+        let mut bytes = Vec::with_capacity((1 + attributes_len + 1) as usize * 32);
+
+        bytes.extend_from_slice(&self.challenge.to_bytes());
+        bytes.extend_from_slice(&self.response_serial_number.to_bytes());
+        bytes.extend_from_slice(&self.response_binding_number.to_bytes());
+
+        bytes.extend_from_slice(&self.response_blinder.to_bytes());
+
+        bytes
+    }
+
+    pub(crate) fn from_bytes(bytes: &[u8]) -> Result<Self> {
+        // at the very minimum there must be a single attribute being proven
+        if bytes.len() < 32 * 4 || (bytes.len()) % 32 != 0 {
+            return Err(CoconutError::DeserializationInvalidLength {
+                actual: bytes.len(),
+                modulus_target: bytes.len(),
+                modulus: 32,
+                object: "kappa and zeta".to_string(),
+                target: 32 * 4,
+            });
+        }
+
+        let challenge_bytes = bytes[..32].try_into().unwrap();
+        let challenge = try_deserialize_scalar(
+            &challenge_bytes,
+            CoconutError::Deserialization("Failed to deserialize challenge".to_string()),
+        )?;
+
+        let serial_number_bytes = &bytes[32..64].try_into().unwrap();
+        let response_serial_number = try_deserialize_scalar(
+            serial_number_bytes,
+            CoconutError::Deserialization("failed to deserialize the serial number".to_string()),
+        )?;
+
+        let binding_number_bytes = &bytes[64..96].try_into().unwrap();
+        let response_binding_number = try_deserialize_scalar(
+            binding_number_bytes,
+            CoconutError::Deserialization("failed to deserialize the binding number".to_string()),
+        )?;
+
+        let blinder_bytes = bytes[96..].try_into().unwrap();
+        let response_blinder = try_deserialize_scalar(
+            &blinder_bytes,
+            CoconutError::Deserialization("failed to deserialize the blinder".to_string()),
+        )?;
+
+        Ok(ProofKappaZeta {
+            challenge,
+            response_serial_number,
+            response_binding_number,
+            response_blinder,
+        })
+    }
+}
+
+// proof builder:
+// - commitment
+// - challenge
+// - responses
+
+#[cfg(test)]
+mod tests {
+    use group::Group;
+    use rand::thread_rng;
+
+    use crate::scheme::issuance::{compute_attribute_encryption, compute_commitment_hash};
+    use crate::scheme::keygen::keygen;
+    use crate::scheme::setup::setup;
+    use crate::scheme::verification::{compute_kappa, compute_zeta};
+
+    use super::*;
+
+    #[test]
+    fn proof_cm_cs_bytes_roundtrip() {
+        let mut rng = thread_rng();
+        let mut params = setup(1).unwrap();
+
+        let elgamal_keypair = elgamal::elgamal_keygen(&params);
+        let private_attributes = params.n_random_scalars(1);
+
+        // we don't care about 'correctness' of the proof. only whether we can correctly recover it from bytes
+        let cm = G1Projective::random(&mut rng);
+        let r = params.random_scalar();
+
+        let commitment_hash = compute_commitment_hash(cm);
+        let (attributes_ciphertexts, _): (Vec<_>, Vec<_>) = compute_attribute_encryption(
+            &params,
+            private_attributes.as_ref(),
+            elgamal_keypair.public_key(),
+            commitment_hash,
+        );
+        let ephemeral_keys = params.n_random_scalars(1);
+
+        // 0 public 1 private
+        let pi_s = ProofCmCs::construct(
+            &mut params,
+            &elgamal_keypair,
+            &ephemeral_keys,
+            &cm,
+            &r,
+            &private_attributes,
+            &*attributes_ciphertexts,
+        );
+
+        let bytes = pi_s.to_bytes();
+        assert_eq!(ProofCmCs::from_bytes(&bytes).unwrap(), pi_s);
+
+        // 2 private
+        let private_attributes = params.n_random_scalars(2);
+        let ephemeral_keys = params.n_random_scalars(2);
+
+        let pi_s = ProofCmCs::construct(
+            &mut params,
+            &elgamal_keypair,
+            &ephemeral_keys,
+            &cm,
+            &r,
+            &private_attributes,
+            &*attributes_ciphertexts,
+        );
+
+        let bytes = pi_s.to_bytes();
+        assert_eq!(ProofCmCs::from_bytes(&bytes).unwrap(), pi_s);
+    }
+
+    #[test]
+    fn proof_kappa_zeta_bytes_roundtrip() {
+        let mut params = setup(4).unwrap();
+
+        let keypair = keygen(&mut params);
+
+        // we don't care about 'correctness' of the proof. only whether we can correctly recover it from bytes
+        let serial_number = params.random_scalar();
+        let binding_number = params.random_scalar();
+        let private_attributes = vec![serial_number, binding_number];
+
+        let r = params.random_scalar();
+        let kappa = compute_kappa(&params, &keypair.verification_key(), &private_attributes, r);
+        let zeta = compute_zeta(&params, serial_number);
+
+        // 0 public 2 private
+        let pi_v = ProofKappaZeta::construct(
+            &mut params,
+            &keypair.verification_key(),
+            &serial_number,
+            &binding_number,
+            &r,
+            &kappa,
+            &zeta,
+        );
+
+        let proof_bytes = pi_v.to_bytes();
+
+        let proof_from_bytes = ProofKappaZeta::from_bytes(&proof_bytes).unwrap();
+        assert_eq!(proof_from_bytes, pi_v);
+
+        // 2 public 2 private
+        let mut params = setup(4).unwrap();
+        let keypair = keygen(&mut params);
+
+        let pi_v = ProofKappaZeta::construct(
+            &mut params,
+            &keypair.verification_key(),
+            &serial_number,
+            &binding_number,
+            &r,
+            &kappa,
+            &zeta,
+        );
+
+        let proof_bytes = pi_v.to_bytes();
+
+        let proof_from_bytes = ProofKappaZeta::from_bytes(&proof_bytes).unwrap();
+        assert_eq!(proof_from_bytes, pi_v);
+    }
+}
@@ -0,0 +1,377 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use core::iter::Sum;
+use core::ops::Mul;
+
+use bls12_381::{G2Prepared, G2Projective, Scalar};
+use group::Curve;
+use itertools::Itertools;
+
+use crate::error::{CoconutError, Result};
+use crate::scheme::verification::check_bilinear_pairing;
+use crate::scheme::{PartialSignature, Signature, SignatureShare, SignerIndex, VerificationKey};
+use crate::utils::perform_lagrangian_interpolation_at_origin;
+use crate::{Attribute, Parameters};
+
+pub(crate) trait Aggregatable: Sized {
+    fn aggregate(aggregatable: &[Self], indices: Option<&[SignerIndex]>) -> Result<Self>;
+
+    fn check_unique_indices(indices: &[SignerIndex]) -> bool {
+        // if aggregation is a threshold one, all indices should be unique
+        indices.iter().unique_by(|&index| index).count() == indices.len()
+    }
+}
+
+// includes `VerificationKey`
+impl<T> Aggregatable for T
+where
+    T: Sum,
+    for<'a> T: Sum<&'a T>,
+    for<'a> &'a T: Mul<Scalar, Output = T>,
+{
+    fn aggregate(aggregatable: &[T], indices: Option<&[u64]>) -> Result<T> {
+        if aggregatable.is_empty() {
+            return Err(CoconutError::Aggregation("Empty set of values".to_string()));
+        }
+
+        if let Some(indices) = indices {
+            if !Self::check_unique_indices(indices) {
+                return Err(CoconutError::Aggregation("Non-unique indices".to_string()));
+            }
+            perform_lagrangian_interpolation_at_origin(indices, aggregatable)
+        } else {
+            // non-threshold
+            Ok(aggregatable.iter().sum())
+        }
+    }
+}
+
+impl Aggregatable for PartialSignature {
+    fn aggregate(sigs: &[PartialSignature], indices: Option<&[u64]>) -> Result<Signature> {
+        let h = sigs
+            .get(0)
+            .ok_or_else(|| CoconutError::Aggregation("Empty set of signatures".to_string()))?
+            .sig1();
+
+        // TODO: is it possible to avoid this allocation?
+        let sigmas = sigs.iter().map(|sig| *sig.sig2()).collect::<Vec<_>>();
+        let aggr_sigma = Aggregatable::aggregate(&sigmas, indices)?;
+
+        Ok(Signature(*h, aggr_sigma))
+    }
+}
+
+/// Ensures all provided verification keys were generated to verify the same number of attributes.
+fn check_same_key_size(keys: &[VerificationKey]) -> bool {
+    keys.iter().map(|vk| vk.beta.len()).all_equal()
+}
+
+pub fn aggregate_verification_keys(
+    keys: &[VerificationKey],
+    indices: Option<&[SignerIndex]>,
+) -> Result<VerificationKey> {
+    if !check_same_key_size(keys) {
+        return Err(CoconutError::Aggregation(
+            "Verification keys are of different sizes".to_string(),
+        ));
+    }
+    Aggregatable::aggregate(keys, indices)
+}
+
+pub fn aggregate_signatures(
+    params: &Parameters,
+    verification_key: &VerificationKey,
+    attributes: &[Attribute],
+    signatures: &[PartialSignature],
+    indices: Option<&[SignerIndex]>,
+) -> Result<Signature> {
+    // aggregate the signature
+
+    let signature = match Aggregatable::aggregate(signatures, indices) {
+        Ok(res) => res,
+        Err(err) => return Err(err),
+    };
+
+    // Verify the signature
+    let alpha = verification_key.alpha;
+
+    let tmp = attributes
+        .iter()
+        .zip(verification_key.beta.iter())
+        .map(|(attr, beta_i)| beta_i * attr)
+        .sum::<G2Projective>();
+
+    if !check_bilinear_pairing(
+        &signature.0.to_affine(),
+        &G2Prepared::from((alpha + tmp).to_affine()),
+        &signature.1.to_affine(),
+        params.prepared_miller_g2(),
+    ) {
+        return Err(CoconutError::Aggregation(
+            "Verification of the aggregated signature failed".to_string(),
+        ));
+    }
+    Ok(signature)
+}
+
+pub fn aggregate_signature_shares(
+    params: &Parameters,
+    verification_key: &VerificationKey,
+    attributes: &[Attribute],
+    shares: &[SignatureShare],
+) -> Result<Signature> {
+    let (signatures, indices): (Vec<_>, Vec<_>) = shares
+        .iter()
+        .map(|share| (*share.signature(), share.index()))
+        .unzip();
+
+    aggregate_signatures(
+        params,
+        verification_key,
+        attributes,
+        &signatures,
+        Some(&indices),
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use bls12_381::G1Projective;
+    use group::Group;
+
+    use crate::scheme::issuance::sign;
+    use crate::scheme::keygen::ttp_keygen;
+    use crate::scheme::setup::Parameters;
+    use crate::scheme::verification::verify;
+
+    use super::*;
+
+    #[test]
+    fn key_aggregation_works_for_any_subset_of_keys() {
+        let mut params = Parameters::new(2).unwrap();
+        let keypairs = ttp_keygen(&mut params, 3, 5).unwrap();
+
+        let vks = keypairs
+            .into_iter()
+            .map(|keypair| keypair.verification_key())
+            .collect::<Vec<_>>();
+
+        let aggr_vk1 = aggregate_verification_keys(&vks[..3], Some(&[1, 2, 3])).unwrap();
+        let aggr_vk2 = aggregate_verification_keys(&vks[2..], Some(&[3, 4, 5])).unwrap();
+
+        assert_eq!(aggr_vk1, aggr_vk2);
+
+        // TODO: should those two actually work or not?
+        // aggregating threshold+1
+        let aggr_more = aggregate_verification_keys(&vks[1..], Some(&[2, 3, 4, 5])).unwrap();
+        assert_eq!(aggr_vk1, aggr_more);
+
+        // aggregating all
+        let aggr_all = aggregate_verification_keys(&vks, Some(&[1, 2, 3, 4, 5])).unwrap();
+        assert_eq!(aggr_all, aggr_vk1);
+
+        // not taking enough points (threshold was 3)
+        let aggr_not_enough = aggregate_verification_keys(&vks[..2], Some(&[1, 2])).unwrap();
+        assert_ne!(aggr_not_enough, aggr_vk1);
+
+        // taking wrong index
+        let aggr_bad = aggregate_verification_keys(&vks[2..], Some(&[42, 123, 100])).unwrap();
+        assert_ne!(aggr_vk1, aggr_bad);
+    }
+
+    #[test]
+    fn key_aggregation_doesnt_work_for_empty_set_of_keys() {
+        let keys: Vec<VerificationKey> = vec![];
+        assert!(aggregate_verification_keys(&keys, None).is_err());
+    }
+
+    #[test]
+    fn key_aggregation_doesnt_work_if_indices_have_invalid_length() {
+        let keys = vec![VerificationKey::identity(3)];
+
+        assert!(aggregate_verification_keys(&keys, Some(&[])).is_err());
+        assert!(aggregate_verification_keys(&keys, Some(&[1, 2])).is_err());
+    }
+
+    #[test]
+    fn key_aggregation_doesnt_work_for_non_unique_indices() {
+        let keys = vec![VerificationKey::identity(3), VerificationKey::identity(3)];
+
+        assert!(aggregate_verification_keys(&keys, Some(&[1, 1])).is_err());
+    }
+
+    #[test]
+    fn key_aggregation_doesnt_work_for_keys_of_different_size() {
+        let keys = vec![VerificationKey::identity(3), VerificationKey::identity(1)];
+
+        assert!(aggregate_verification_keys(&keys, None).is_err())
+    }
+
+    #[test]
+    fn signature_aggregation_works_for_any_subset_of_signatures() {
+        let mut params = Parameters::new(2).unwrap();
+        let attributes = params.n_random_scalars(2);
+
+        let keypairs = ttp_keygen(&mut params, 3, 5).unwrap();
+
+        let (sks, vks): (Vec<_>, Vec<_>) = keypairs
+            .into_iter()
+            .map(|keypair| (keypair.secret_key(), keypair.verification_key()))
+            .unzip();
+
+        let sigs = sks
+            .iter()
+            .map(|sk| sign(&mut params, sk, &attributes).unwrap())
+            .collect::<Vec<_>>();
+
+        // aggregating (any) threshold works
+        let aggr_vk_1 = aggregate_verification_keys(&vks[..3], Some(&[1, 2, 3])).unwrap();
+        let aggr_sig1 = aggregate_signatures(
+            &params,
+            &aggr_vk_1,
+            &attributes,
+            &sigs[..3],
+            Some(&[1, 2, 3]),
+        )
+        .unwrap();
+
+        let aggr_vk_2 = aggregate_verification_keys(&vks[2..], Some(&[3, 4, 5])).unwrap();
+        let aggr_sig2 = aggregate_signatures(
+            &params,
+            &aggr_vk_1,
+            &attributes,
+            &sigs[2..],
+            Some(&[3, 4, 5]),
+        )
+        .unwrap();
+        assert_eq!(aggr_sig1, aggr_sig2);
+
+        // verify credential for good measure
+        assert!(verify(&params, &aggr_vk_1, &attributes, &aggr_sig1));
+        assert!(verify(&params, &aggr_vk_2, &attributes, &aggr_sig2));
+
+        // aggregating threshold+1 works
+        let aggr_vk_more = aggregate_verification_keys(&vks[1..], Some(&[2, 3, 4, 5])).unwrap();
+        let aggr_more = aggregate_signatures(
+            &params,
+            &aggr_vk_more,
+            &attributes,
+            &sigs[1..],
+            Some(&[2, 3, 4, 5]),
+        )
+        .unwrap();
+        assert_eq!(aggr_sig1, aggr_more);
+
+        // aggregating all
+        let aggr_vk_all = aggregate_verification_keys(&vks, Some(&[1, 2, 3, 4, 5])).unwrap();
+        let aggr_all = aggregate_signatures(
+            &params,
+            &aggr_vk_all,
+            &attributes,
+            &sigs,
+            Some(&[1, 2, 3, 4, 5]),
+        )
+        .unwrap();
+        assert_eq!(aggr_all, aggr_sig1);
+
+        // not taking enough points (threshold was 3) should fail
+        let aggr_vk_not_enough = aggregate_verification_keys(&vks[..2], Some(&[1, 2])).unwrap();
+        let aggr_not_enough = aggregate_signatures(
+            &params,
+            &aggr_vk_not_enough,
+            &attributes,
+            &sigs[..2],
+            Some(&[1, 2]),
+        )
+        .unwrap();
+        assert_ne!(aggr_not_enough, aggr_sig1);
+
+        // taking wrong index should fail
+        let aggr_vk_bad = aggregate_verification_keys(&vks[2..], Some(&[1, 2, 3])).unwrap();
+        assert!(aggregate_signatures(
+            &params,
+            &aggr_vk_bad,
+            &attributes,
+            &sigs[2..],
+            Some(&[42, 123, 100]),
+        )
+        .is_err());
+    }
+
+    fn random_signature() -> Signature {
+        let mut rng = rand::thread_rng();
+        Signature(
+            G1Projective::random(&mut rng),
+            G1Projective::random(&mut rng),
+        )
+    }
+
+    #[test]
+    fn signature_aggregation_doesnt_work_for_empty_set_of_signatures() {
+        let signatures: Vec<Signature> = vec![];
+        let mut params = Parameters::new(2).unwrap();
+        let attributes = params.n_random_scalars(2);
+        let keypairs = ttp_keygen(&mut params, 3, 5).unwrap();
+
+        let (_, vks): (Vec<_>, Vec<_>) = keypairs
+            .into_iter()
+            .map(|keypair| (keypair.secret_key(), keypair.verification_key()))
+            .unzip();
+
+        let aggr_vk_all = aggregate_verification_keys(&vks, None).unwrap();
+        assert!(
+            aggregate_signatures(&params, &aggr_vk_all, &attributes, &signatures, None).is_err()
+        );
+    }
+
+    #[test]
+    fn signature_aggregation_doesnt_work_if_indices_have_invalid_length() {
+        let signatures = vec![random_signature()];
+        let mut params = Parameters::new(2).unwrap();
+        let attributes = params.n_random_scalars(2);
+        let keypairs = ttp_keygen(&mut params, 3, 5).unwrap();
+        let (_, vks): (Vec<_>, Vec<_>) = keypairs
+            .into_iter()
+            .map(|keypair| (keypair.secret_key(), keypair.verification_key()))
+            .unzip();
+        let aggr_vk_all = aggregate_verification_keys(&vks, None).unwrap();
+
+        assert!(
+            aggregate_signatures(&params, &aggr_vk_all, &attributes, &signatures, Some(&[]))
+                .is_err()
+        );
+        assert!(aggregate_signatures(
+            &params,
+            &aggr_vk_all,
+            &attributes,
+            &signatures,
+            Some(&[1, 2]),
+        )
+        .is_err());
+    }
+
+    #[test]
+    fn signature_aggregation_doesnt_work_for_non_unique_indices() {
+        let signatures = vec![random_signature(), random_signature()];
+        let mut params = Parameters::new(2).unwrap();
+        let attributes = params.n_random_scalars(2);
+        let keypairs = ttp_keygen(&mut params, 3, 5).unwrap();
+        let (_, vks): (Vec<_>, Vec<_>) = keypairs
+            .into_iter()
+            .map(|keypair| (keypair.secret_key(), keypair.verification_key()))
+            .unzip();
+        let aggr_vk_all = aggregate_verification_keys(&vks, None).unwrap();
+
+        assert!(aggregate_signatures(
+            &params,
+            &aggr_vk_all,
+            &attributes,
+            &signatures,
+            Some(&[1, 1]),
+        )
+        .is_err());
+    }
+
+    // TODO: test for aggregating non-threshold keys
+}
@@ -0,0 +1,382 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use std::convert::TryFrom;
+use std::convert::TryInto;
+
+use bls12_381::{G1Affine, G1Projective, Scalar};
+use group::{Curve, GroupEncoding};
+
+use crate::elgamal::{Ciphertext, EphemeralKey};
+use crate::error::{CoconutError, Result};
+use crate::proofs::ProofCmCs;
+use crate::scheme::setup::Parameters;
+use crate::scheme::BlindedSignature;
+use crate::scheme::SecretKey;
+/// Creates a Coconut Signature under a given secret key on a set of public attributes only.
+#[cfg(test)]
+use crate::Signature;
+use crate::{elgamal, Attribute, ElGamalKeyPair};
+// TODO: possibly completely remove those two functions.
+// They only exist to have a simpler and smaller code snippets to test
+// basic functionalities.
+use crate::traits::{Base58, Bytable};
+use crate::utils::{hash_g1, try_deserialize_g1_projective};
+
+// TODO NAMING: double check this one
+// Lambda
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct BlindSignRequest {
+    // cm
+    commitment: G1Projective,
+    // h
+    commitment_hash: G1Projective,
+    // c
+    private_attributes_ciphertexts: Vec<elgamal::Ciphertext>,
+    // pi_s
+    pi_s: ProofCmCs,
+}
+
+impl TryFrom<&[u8]> for BlindSignRequest {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<BlindSignRequest> {
+        if bytes.len() < 48 + 48 + 8 + 96 {
+            return Err(CoconutError::DeserializationMinLength {
+                min: 48 + 48 + 8 + 96,
+                actual: bytes.len(),
+            });
+        }
+
+        let mut j = 0;
+        let commitment_bytes_len = 48;
+        let commitment_hash_bytes_len = 48;
+
+        let cm_bytes = bytes[..j + commitment_bytes_len].try_into().unwrap();
+        let commitment = try_deserialize_g1_projective(
+            &cm_bytes,
+            CoconutError::Deserialization(
+                "Failed to deserialize compressed commitment".to_string(),
+            ),
+        )?;
+        j += commitment_bytes_len;
+
+        let cm_hash_bytes = bytes[j..j + commitment_hash_bytes_len].try_into().unwrap();
+        let commitment_hash = try_deserialize_g1_projective(
+            &cm_hash_bytes,
+            CoconutError::Deserialization(
+                "Failed to deserialize compressed commitment hash".to_string(),
+            ),
+        )?;
+        j += commitment_hash_bytes_len;
+
+        let c_len = u64::from_le_bytes(bytes[j..j + 8].try_into().unwrap());
+        j += 8;
+        if bytes[j..].len() < c_len as usize * 96 {
+            return Err(CoconutError::DeserializationMinLength {
+                min: c_len as usize * 96,
+                actual: bytes[56..].len(),
+            });
+        }
+
+        let mut private_attributes_ciphertexts = Vec::with_capacity(c_len as usize);
+        for i in 0..c_len as usize {
+            let start = j + i * 96;
+            let end = start + 96;
+            private_attributes_ciphertexts.push(Ciphertext::try_from(&bytes[start..end])?)
+        }
+
+        let pi_s = ProofCmCs::from_bytes(&bytes[j + c_len as usize * 96..])?;
+
+        Ok(BlindSignRequest {
+            commitment,
+            commitment_hash,
+            private_attributes_ciphertexts,
+            pi_s,
+        })
+    }
+}
+
+impl Bytable for BlindSignRequest {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        let cm_bytes = self.commitment.to_affine().to_compressed();
+        let cm_hash_bytes = self.commitment_hash.to_affine().to_compressed();
+        let c_len = self.private_attributes_ciphertexts.len() as u64;
+        let proof_bytes = self.pi_s.to_bytes();
+
+        let mut bytes = Vec::with_capacity(48 + 48 + 8 + c_len as usize * 96 + proof_bytes.len());
+
+        bytes.extend_from_slice(&cm_bytes);
+        bytes.extend_from_slice(&cm_hash_bytes);
+        bytes.extend_from_slice(&c_len.to_le_bytes());
+        for c in &self.private_attributes_ciphertexts {
+            bytes.extend_from_slice(&c.to_bytes());
+        }
+
+        bytes.extend_from_slice(&proof_bytes);
+
+        bytes
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        BlindSignRequest::from_bytes(slice)
+    }
+}
+
+impl Base58 for BlindSignRequest {}
+
+impl BlindSignRequest {
+    fn verify_proof(&self, params: &Parameters, pub_key: &elgamal::PublicKey) -> bool {
+        self.pi_s.verify(
+            params,
+            pub_key,
+            &self.commitment,
+            &self.private_attributes_ciphertexts,
+        )
+    }
+
+    pub fn get_commitment_hash(&self) -> G1Projective {
+        self.commitment_hash
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        self.to_byte_vec()
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<BlindSignRequest> {
+        BlindSignRequest::try_from(bytes)
+    }
+}
+
+pub fn compute_private_attributes_commitment(
+    params: &Parameters,
+    private_attributes: &[Attribute],
+    hs: &[G1Affine],
+) -> (Scalar, G1Projective) {
+    let commitment_opening = params.random_scalar();
+
+    // Produces h0 ^ m0 * h1^m1 * .... * hn^mn
+    // where m0, m1, ...., mn are private attributes
+    let attr_cm = private_attributes
+        .iter()
+        .zip(hs)
+        .map(|(&m, h)| h * m)
+        .sum::<G1Projective>();
+
+    // Produces g1^r * h0 ^ m0 * h1^m1 * .... * hn^mn
+    let commitment = params.gen1() * commitment_opening + attr_cm;
+    (commitment_opening, commitment)
+}
+
+pub fn compute_commitment_hash(commitment: G1Projective) -> G1Projective {
+    hash_g1(commitment.to_bytes())
+}
+
+pub fn compute_attribute_encryption(
+    params: &Parameters,
+    private_attributes: &[Attribute],
+    pub_key: &elgamal::PublicKey,
+    commitment_hash: G1Projective,
+) -> (Vec<Ciphertext>, Vec<EphemeralKey>) {
+    private_attributes
+        .iter()
+        .map(|m| pub_key.encrypt(params, &commitment_hash, m))
+        .unzip()
+}
+
+/// Builds cryptographic material required for blind sign.
+pub fn prepare_blind_sign(
+    params: &Parameters,
+    elgamal_keypair: &ElGamalKeyPair,
+    private_attributes: &[Attribute],
+    public_attributes: &[Attribute],
+) -> Result<BlindSignRequest> {
+    if private_attributes.is_empty() {
+        return Err(CoconutError::Issuance(
+            "Tried to prepare blind sign request for an empty set of private attributes"
+                .to_string(),
+        ));
+    }
+
+    let hs = params.gen_hs();
+    if private_attributes.len() + public_attributes.len() > hs.len() {
+        return Err(CoconutError::IssuanceMaxAttributes {
+            max: hs.len(),
+            requested: private_attributes.len() + public_attributes.len(),
+        });
+    }
+
+    let (commitment_opening, commitment) =
+        compute_private_attributes_commitment(params, private_attributes, hs);
+
+    // Compute the challenge as the commitment hash
+    let commitment_hash = compute_commitment_hash(commitment);
+    // build ElGamal encryption
+    let (private_attributes_ciphertexts, ephemeral_keys): (Vec<_>, Vec<_>) =
+        compute_attribute_encryption(
+            params,
+            private_attributes,
+            elgamal_keypair.public_key(),
+            commitment_hash,
+        );
+
+    let pi_s = ProofCmCs::construct(
+        params,
+        elgamal_keypair,
+        &ephemeral_keys,
+        &commitment,
+        &commitment_opening,
+        private_attributes,
+        &*private_attributes_ciphertexts,
+    );
+
+    Ok(BlindSignRequest {
+        commitment,
+        commitment_hash,
+        private_attributes_ciphertexts,
+        pi_s,
+    })
+}
+
+pub fn blind_sign(
+    params: &Parameters,
+    signing_secret_key: &SecretKey,
+    prover_pub_key: &elgamal::PublicKey,
+    blind_sign_request: &BlindSignRequest,
+    public_attributes: &[Attribute],
+) -> Result<BlindedSignature> {
+    let num_private = blind_sign_request.private_attributes_ciphertexts.len();
+    let hs = params.gen_hs();
+
+    if num_private + public_attributes.len() > hs.len() {
+        return Err(CoconutError::IssuanceMaxAttributes {
+            max: hs.len(),
+            requested: num_private + public_attributes.len(),
+        });
+    }
+
+    // Verify the commitment hash
+    let h = hash_g1(blind_sign_request.commitment.to_bytes());
+    if !(h == blind_sign_request.commitment_hash) {
+        return Err(CoconutError::Issuance(
+            "Failed to verify the commitment hash".to_string(),
+        ));
+    }
+
+    // Verify the ZK proof
+    if !blind_sign_request.verify_proof(params, prover_pub_key) {
+        return Err(CoconutError::Issuance(
+            "Failed to verify the proof of knowledge".to_string(),
+        ));
+    }
+
+    // in python implementation there are n^2 G1 multiplications, let's do it with a single one instead.
+    // i.e. compute h ^ (pub_m[0] * y[m + 1] + ... + pub_m[n] * y[m + n]) directly (where m is number of PRIVATE attributes)
+    // rather than ((h ^ pub_m[0]) ^ y[m + 1] , (h ^ pub_m[1]) ^ y[m + 2] , ...).sum() separately
+    let signed_public = h * public_attributes
+        .iter()
+        .zip(signing_secret_key.ys.iter().skip(num_private))
+        .map(|(attr, yi)| attr * yi)
+        .sum::<Scalar>();
+
+    // c1[0] ^ y[0] * ... * c1[m] ^ y[m]
+    let sig_1 = blind_sign_request
+        .private_attributes_ciphertexts
+        .iter()
+        .map(|ciphertext| ciphertext.c1())
+        .zip(signing_secret_key.ys.iter())
+        .map(|(c1, yi)| c1 * yi)
+        .sum();
+
+    // h ^ x + c2[0] ^ y[0] + ... c2[m] ^ y[m] + h ^ (pub_m[0] * y[m + 1] + ... + pub_m[n] * y[m + n])
+    let sig_2 = blind_sign_request
+        .private_attributes_ciphertexts
+        .iter()
+        .map(|ciphertext| ciphertext.c2())
+        .zip(signing_secret_key.ys.iter())
+        .map(|(c2, yi)| c2 * yi)
+        .chain(std::iter::once(h * signing_secret_key.x))
+        .chain(std::iter::once(signed_public))
+        .sum();
+
+    Ok(BlindedSignature(h, elgamal::Ciphertext(sig_1, sig_2)))
+}
+
+#[cfg(test)]
+pub fn sign(
+    params: &mut Parameters,
+    secret_key: &SecretKey,
+    public_attributes: &[Attribute],
+) -> Result<Signature> {
+    if public_attributes.len() > secret_key.ys.len() {
+        return Err(CoconutError::IssuanceMaxAttributes {
+            max: secret_key.ys.len(),
+            requested: public_attributes.len(),
+        });
+    }
+
+    // TODO: why in the python implementation this hash onto the curve is present
+    // while it's not used in the paper? the paper uses random exponent instead.
+    // (the python implementation hashes string representation of all attributes onto the curve,
+    // but I think the same can be achieved by just summing the attributes thus avoiding the unnecessary
+    // transformation. If I'm wrong, please correct me.)
+    let attributes_sum = public_attributes.iter().sum::<Scalar>();
+    let h = hash_g1((params.gen1() * attributes_sum).to_bytes());
+
+    // x + m0 * y0 + m1 * y1 + ... mn * yn
+    let exponent = secret_key.x
+        + public_attributes
+            .iter()
+            .zip(secret_key.ys.iter())
+            .map(|(m_i, y_i)| m_i * y_i)
+            .sum::<Scalar>();
+
+    let sig2 = h * exponent;
+    Ok(Signature(h, sig2))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn blind_sign_request_bytes_roundtrip() {
+        let mut params = Parameters::new(1).unwrap();
+        let public_attributes = params.n_random_scalars(0);
+        let private_attributes = params.n_random_scalars(1);
+        let elgamal_keypair = elgamal::elgamal_keygen(&params);
+
+        let lambda = prepare_blind_sign(
+            &mut params,
+            &elgamal_keypair,
+            &private_attributes,
+            &public_attributes,
+        )
+        .unwrap();
+
+        let bytes = lambda.to_bytes();
+        println!("{:?}", bytes.len());
+        assert_eq!(
+            BlindSignRequest::try_from(bytes.as_slice()).unwrap(),
+            lambda
+        );
+
+        let mut params = Parameters::new(4).unwrap();
+        let public_attributes = params.n_random_scalars(2);
+        let private_attributes = params.n_random_scalars(2);
+        let lambda = prepare_blind_sign(
+            &mut params,
+            &elgamal_keypair,
+            &private_attributes,
+            &public_attributes,
+        )
+        .unwrap();
+
+        let bytes = lambda.to_bytes();
+        assert_eq!(
+            BlindSignRequest::try_from(bytes.as_slice()).unwrap(),
+            lambda
+        );
+    }
+}
@@ -0,0 +1,539 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use core::borrow::Borrow;
+use core::iter::Sum;
+use core::ops::{Add, Mul};
+use std::convert::TryFrom;
+use std::convert::TryInto;
+
+use bls12_381::{G2Projective, Scalar};
+use group::Curve;
+use serde_derive::{Deserialize, Serialize};
+
+use crate::error::{CoconutError, Result};
+use crate::scheme::aggregation::aggregate_verification_keys;
+use crate::scheme::setup::Parameters;
+use crate::scheme::SignerIndex;
+use crate::traits::Bytable;
+use crate::utils::{
+    try_deserialize_g2_projective, try_deserialize_scalar, try_deserialize_scalar_vec, Polynomial,
+};
+use crate::Base58;
+
+#[derive(Debug, Clone)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct SecretKey {
+    pub(crate) x: Scalar,
+    pub(crate) ys: Vec<Scalar>,
+}
+
+impl TryFrom<&[u8]> for SecretKey {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<SecretKey> {
+        if bytes.len() < 32 * 2 + 8 || (bytes.len() - 8) % 32 != 0 {
+            return Err(CoconutError::DeserializationInvalidLength {
+                actual: bytes.len(),
+                modulus_target: bytes.len() - 8,
+                target: 32 * 2 + 8,
+                modulus: 32,
+                object: "secret key".to_string(),
+            });
+        }
+
+        // this conversion will not fail as we are taking the same length of data
+        let x_bytes: [u8; 32] = bytes[..32].try_into().unwrap();
+        let ys_len = u64::from_le_bytes(bytes[32..40].try_into().unwrap());
+        let actual_ys_len = (bytes.len() - 40) / 32;
+
+        if ys_len as usize != actual_ys_len {
+            return Err(CoconutError::Deserialization(format!(
+                "Tried to deserialize secret key with inconsistent ys len (expected {}, got {})",
+                ys_len, actual_ys_len
+            )));
+        }
+
+        let x = try_deserialize_scalar(
+            &x_bytes,
+            CoconutError::Deserialization("Failed to deserialize secret key scalar".to_string()),
+        )?;
+        let ys = try_deserialize_scalar_vec(
+            ys_len,
+            &bytes[40..],
+            CoconutError::Deserialization("Failed to deserialize secret key scalars".to_string()),
+        )?;
+
+        Ok(SecretKey { x, ys })
+    }
+}
+
+impl SecretKey {
+    /// Derive verification key using this secret key.
+    pub fn verification_key(&self, params: &Parameters) -> VerificationKey {
+        let g2 = params.gen2();
+        VerificationKey {
+            alpha: g2 * self.x,
+            beta: self.ys.iter().map(|y| g2 * y).collect(),
+        }
+    }
+
+    // x || ys.len() || ys
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let ys_len = self.ys.len() as u64;
+        let mut bytes = Vec::with_capacity(8 + (ys_len + 1) as usize * 32);
+
+        bytes.extend_from_slice(&self.x.to_bytes());
+        bytes.extend_from_slice(&ys_len.to_le_bytes());
+        for y in self.ys.iter() {
+            bytes.extend_from_slice(&y.to_bytes())
+        }
+        bytes
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<SecretKey> {
+        SecretKey::try_from(bytes)
+    }
+}
+
+impl Bytable for SecretKey {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.to_bytes()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        SecretKey::try_from(slice)
+    }
+}
+
+impl Base58 for SecretKey {}
+
+// TODO: perhaps change points to affine representation
+// to make verification slightly more efficient?
+#[derive(Debug, PartialEq, Clone)]
+pub struct VerificationKey {
+    // TODO add gen2 as per the paper or imply it from the fact library is using bls381?
+    pub(crate) alpha: G2Projective,
+    pub(crate) beta: Vec<G2Projective>,
+}
+
+impl TryFrom<&[u8]> for VerificationKey {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<VerificationKey> {
+        if bytes.len() < 96 * 2 + 8 || (bytes.len() - 8) % 96 != 0 {
+            return Err(CoconutError::DeserializationInvalidLength {
+                actual: bytes.len(),
+                modulus_target: bytes.len() - 8,
+                target: 96 * 2 + 8,
+                modulus: 96,
+                object: "secret key".to_string(),
+            });
+        }
+
+        // this conversion will not fail as we are taking the same length of data
+        let alpha_bytes: [u8; 96] = bytes[..96].try_into().unwrap();
+        let beta_len = u64::from_le_bytes(bytes[96..104].try_into().unwrap());
+        let actual_beta_len = (bytes.len() - 104) / 96;
+
+        if beta_len as usize != actual_beta_len {
+            return Err(
+                CoconutError::Deserialization(
+                    format!("Tried to deserialize verification key with inconsistent beta len (expected {}, got {})",
+                            beta_len, actual_beta_len
+                    )));
+        }
+
+        let alpha = try_deserialize_g2_projective(
+            &alpha_bytes,
+            CoconutError::Deserialization(
+                "Failed to deserialize verification key G2 point (alpha)".to_string(),
+            ),
+        )?;
+
+        let mut beta = Vec::with_capacity(actual_beta_len);
+        for i in 0..actual_beta_len {
+            let start = 104 + i * 96;
+            let end = start + 96;
+            let beta_i_bytes = bytes[start..end].try_into().unwrap();
+            let beta_i = try_deserialize_g2_projective(
+                &beta_i_bytes,
+                CoconutError::Deserialization(
+                    "Failed to deserialize verification key G2 point (beta)".to_string(),
+                ),
+            )?;
+
+            beta.push(beta_i)
+        }
+
+        Ok(VerificationKey { alpha, beta })
+    }
+}
+
+impl<'b> Add<&'b VerificationKey> for VerificationKey {
+    type Output = VerificationKey;
+
+    #[inline]
+    fn add(self, rhs: &'b VerificationKey) -> VerificationKey {
+        // If you're trying to add two keys together that were created
+        // for different number of attributes, just panic as it's a
+        // nonsense operation.
+        assert_eq!(
+            self.beta.len(),
+            rhs.beta.len(),
+            "trying to add verification keys generated for different number of attributes"
+        );
+
+        VerificationKey {
+            alpha: self.alpha + rhs.alpha,
+            beta: self
+                .beta
+                .iter()
+                .zip(rhs.beta.iter())
+                .map(|(self_beta, rhs_beta)| self_beta + rhs_beta)
+                .collect(),
+        }
+    }
+}
+
+impl<'a> Mul<Scalar> for &'a VerificationKey {
+    type Output = VerificationKey;
+
+    #[inline]
+    fn mul(self, rhs: Scalar) -> Self::Output {
+        VerificationKey {
+            alpha: self.alpha * rhs,
+            beta: self.beta.iter().map(|b_i| b_i * rhs).collect(),
+        }
+    }
+}
+
+impl<T> Sum<T> for VerificationKey
+where
+    T: Borrow<VerificationKey>,
+{
+    #[inline]
+    fn sum<I>(iter: I) -> Self
+    where
+        I: Iterator<Item = T>,
+    {
+        let mut peekable = iter.peekable();
+        let head_attributes = match peekable.peek() {
+            Some(head) => head.borrow().beta.len(),
+            None => {
+                // TODO: this is a really weird edge case. You're trying to sum an EMPTY iterator
+                // of VerificationKey. So should it panic here or just return some nonsense value?
+                return VerificationKey::identity(0);
+            }
+        };
+
+        peekable.fold(VerificationKey::identity(head_attributes), |acc, item| {
+            acc + item.borrow()
+        })
+    }
+}
+
+impl VerificationKey {
+    /// Create a (kinda) identity verification key using specified
+    /// number of 'beta' elements
+    pub(crate) fn identity(beta_size: usize) -> Self {
+        VerificationKey {
+            alpha: G2Projective::identity(),
+            beta: vec![G2Projective::identity(); beta_size],
+        }
+    }
+
+    pub fn aggregate(sigs: &[Self], indices: Option<&[SignerIndex]>) -> Result<Self> {
+        aggregate_verification_keys(sigs, indices)
+    }
+
+    pub fn alpha(&self) -> &G2Projective {
+        &self.alpha
+    }
+
+    pub fn beta(&self) -> &Vec<G2Projective> {
+        &self.beta
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let beta_len = self.beta.len() as u64;
+        let mut bytes = Vec::with_capacity(8 + (beta_len + 1) as usize * 96);
+
+        bytes.extend_from_slice(&self.alpha.to_affine().to_compressed());
+        bytes.extend_from_slice(&beta_len.to_le_bytes());
+        for beta in self.beta.iter() {
+            bytes.extend_from_slice(&beta.to_affine().to_compressed())
+        }
+        bytes
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<VerificationKey> {
+        VerificationKey::try_from(bytes)
+    }
+}
+
+impl Bytable for VerificationKey {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.to_bytes()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        VerificationKey::try_from(slice)
+    }
+}
+
+impl Base58 for VerificationKey {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct KeyPair {
+    secret_key: SecretKey,
+    verification_key: VerificationKey,
+
+    /// Optional index value specifying polynomial point used during threshold key generation.
+    pub index: Option<SignerIndex>,
+}
+
+impl KeyPair {
+    const MARKER_BYTES: &'static [u8] = b"coconutkeypair";
+
+    pub fn secret_key(&self) -> SecretKey {
+        self.secret_key.clone()
+    }
+
+    pub fn verification_key(&self) -> VerificationKey {
+        self.verification_key.clone()
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        // Schema is coconutkeypair[14]|secret_key_len[8]|secret_key[secret_key_len]|verification_key_len[8]|verification_key[verification_key_len]|signer_index[8] - optional
+        self.to_byte_vec()
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<Self> {
+        KeyPair::try_from_byte_slice(bytes)
+    }
+}
+
+impl Bytable for KeyPair {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        // Schema is coconutkeypair[14]|secret_key_len[8]|secret_key[secret_key_len]|verification_key_len[8]|verification_key[verification_key_len]|signer_index[8] - optional
+        let mut byts = vec![];
+        let secret_key_bytes = self.secret_key.to_bytes();
+        let secret_key_len = (secret_key_bytes.len() as u64).to_le_bytes();
+        let verification_key_bytes = self.verification_key.to_bytes();
+        let verification_key_len = (verification_key_bytes.len() as u64).to_le_bytes();
+        byts.extend_from_slice(Self::MARKER_BYTES);
+        byts.extend_from_slice(&secret_key_len);
+        byts.extend_from_slice(&secret_key_bytes);
+        byts.extend_from_slice(&verification_key_len);
+        byts.extend_from_slice(&verification_key_bytes);
+        if let Some(index) = self.index {
+            byts.extend_from_slice(&index.to_le_bytes())
+        }
+        byts
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        KeyPair::try_from(slice)
+    }
+}
+
+impl Base58 for KeyPair {}
+
+impl TryFrom<&[u8]> for KeyPair {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<KeyPair> {
+        let header_len = Self::MARKER_BYTES.len();
+
+        // we must be able to at the very least read the length of secret key which is past the header
+        // and is 8 bytes long
+        if bytes.len() < header_len + 8 {
+            return Err(CoconutError::DeserializationMinLength {
+                min: header_len + 8,
+                actual: bytes.len(),
+            });
+        }
+
+        let secret_key_len =
+            u64::from_le_bytes(bytes[header_len..header_len + 8].try_into().unwrap()) as usize;
+        let secret_key_start = header_len + 8;
+
+        let secret_key =
+            SecretKey::try_from(&bytes[secret_key_start..secret_key_start + secret_key_len])?;
+
+        // we must be able to read the length of verification key
+        if bytes.len() < secret_key_start + secret_key_len + 8 {
+            return Err(CoconutError::DeserializationMinLength {
+                min: secret_key_start + secret_key_len + 8,
+                actual: bytes.len(),
+            });
+        }
+
+        let verification_key_len = u64::from_le_bytes(
+            bytes[secret_key_start + secret_key_len..secret_key_start + secret_key_len + 8]
+                .try_into()
+                .unwrap(),
+        ) as usize;
+        let verification_key_start = secret_key_start + secret_key_len + 8;
+
+        let verification_key = VerificationKey::try_from(
+            &bytes[verification_key_start..verification_key_start + verification_key_len],
+        )?;
+        let consumed_bytes = verification_key_start + verification_key_len;
+        let index = if consumed_bytes < bytes.len() && [consumed_bytes..].len() == 8 {
+            Some(u64::from_le_bytes(
+                bytes[consumed_bytes..consumed_bytes + 8]
+                    .try_into()
+                    .unwrap(),
+            ))
+        } else {
+            None
+        };
+        Ok(KeyPair {
+            secret_key,
+            verification_key,
+            index,
+        })
+    }
+}
+
+/// Generate a single Coconut keypair ((x, y0, y1...), (g2^x, g2^y0, ...)).
+/// It is not suitable for threshold credentials as all subsequent calls to `keygen` generate keys
+/// that are independent of each other.
+#[cfg(test)]
+pub fn keygen(params: &Parameters) -> KeyPair {
+    let attributes = params.gen_hs().len();
+
+    let x = params.random_scalar();
+    let ys = params.n_random_scalars(attributes);
+
+    let secret_key = SecretKey { x, ys };
+    let verification_key = secret_key.verification_key(params);
+
+    KeyPair {
+        secret_key,
+        verification_key,
+        index: None,
+    }
+}
+
+/// Generate a set of n Coconut keypairs [((x, y0, y1...), (g2^x, g2^y0, ...)), ...],
+/// such that they support threshold aggregation by `threshold` number of parties.
+/// It is expected that this procedure is executed by a Trusted Third Party.
+pub fn ttp_keygen(
+    params: &Parameters,
+    threshold: u64,
+    num_authorities: u64,
+) -> Result<Vec<KeyPair>> {
+    if threshold == 0 {
+        return Err(CoconutError::Setup(
+            "Tried to generate threshold keys with a 0 threshold value".to_string(),
+        ));
+    }
+
+    if threshold > num_authorities {
+        return Err(
+            CoconutError::Setup(
+                "Tried to generate threshold keys for threshold value being higher than number of the signing authorities".to_string(),
+            ));
+    }
+
+    let attributes = params.gen_hs().len();
+
+    // generate polynomials
+    let v = Polynomial::new_random(params, threshold - 1);
+    let ws = (0..attributes)
+        .map(|_| Polynomial::new_random(params, threshold - 1))
+        .collect::<Vec<_>>();
+
+    // TODO: potentially if we had some known authority identifier we could use that instead
+    // of the increasing (1,2,3,...) sequence
+    let polynomial_indices = (1..=num_authorities).collect::<Vec<_>>();
+
+    // generate polynomial shares
+    let x = polynomial_indices
+        .iter()
+        .map(|&id| v.evaluate(&Scalar::from(id)));
+    let ys = polynomial_indices.iter().map(|&id| {
+        ws.iter()
+            .map(|w| w.evaluate(&Scalar::from(id)))
+            .collect::<Vec<_>>()
+    });
+
+    // finally set the keys
+    let secret_keys = x.zip(ys).map(|(x, ys)| SecretKey { x, ys });
+
+    let keypairs = secret_keys
+        .zip(polynomial_indices.iter())
+        .map(|(secret_key, index)| {
+            let verification_key = secret_key.verification_key(params);
+            KeyPair {
+                secret_key,
+                verification_key,
+                index: Some(*index),
+            }
+        })
+        .collect();
+
+    Ok(keypairs)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::scheme::setup::setup;
+
+    use super::*;
+
+    #[test]
+    fn keypair_bytes_roundtrip() {
+        let mut params1 = setup(1).unwrap();
+        let mut params5 = setup(5).unwrap();
+
+        let keypair1 = keygen(&mut params1);
+        let keypair5 = keygen(&mut params5);
+
+        let bytes1 = keypair1.to_bytes();
+        let bytes5 = keypair5.to_bytes();
+
+        assert_eq!(KeyPair::from_bytes(&bytes1).unwrap(), keypair1);
+        assert_eq!(KeyPair::from_bytes(&bytes5).unwrap(), keypair5);
+    }
+
+    #[test]
+    fn secret_key_bytes_roundtrip() {
+        let mut params1 = setup(1).unwrap();
+        let mut params5 = setup(5).unwrap();
+
+        let keypair1 = keygen(&mut params1);
+        let keypair5 = keygen(&mut params5);
+
+        let bytes1 = keypair1.secret_key.to_bytes();
+        let bytes5 = keypair5.secret_key.to_bytes();
+
+        assert_eq!(SecretKey::from_bytes(&bytes1).unwrap(), keypair1.secret_key);
+        assert_eq!(SecretKey::from_bytes(&bytes5).unwrap(), keypair5.secret_key);
+    }
+
+    #[test]
+    fn verification_key_bytes_roundtrip() {
+        let mut params1 = setup(1).unwrap();
+        let mut params5 = setup(5).unwrap();
+
+        let keypair1 = &keygen(&mut params1);
+        let keypair5 = &keygen(&mut params5);
+
+        let bytes1: Vec<u8> = keypair1.verification_key.to_bytes();
+        let bytes5: Vec<u8> = keypair5.verification_key.to_bytes();
+
+        assert_eq!(
+            VerificationKey::try_from(bytes1.as_slice()).unwrap(),
+            keypair1.verification_key
+        );
+        assert_eq!(
+            VerificationKey::try_from(bytes5.as_slice()).unwrap(),
+            keypair5.verification_key
+        );
+    }
+}
@@ -0,0 +1,661 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+// TODO: implement https://crates.io/crates/signature traits?
+
+use std::convert::TryFrom;
+use std::convert::TryInto;
+
+use bls12_381::{G1Projective, G2Prepared, G2Projective, Scalar};
+use group::Curve;
+
+pub use keygen::{SecretKey, VerificationKey};
+
+use crate::elgamal::Ciphertext;
+use crate::error::{CoconutError, Result};
+use crate::scheme::setup::Parameters;
+use crate::scheme::verification::check_bilinear_pairing;
+use crate::traits::{Base58, Bytable};
+use crate::utils::try_deserialize_g1_projective;
+use crate::{elgamal, Attribute};
+
+pub mod aggregation;
+pub mod issuance;
+pub mod keygen;
+pub mod setup;
+pub mod verification;
+
+pub type SignerIndex = u64;
+
+// (h, s)
+#[derive(Debug, Clone, Copy)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct Signature(pub(crate) G1Projective, pub(crate) G1Projective);
+
+pub type PartialSignature = Signature;
+
+impl TryFrom<&[u8]> for Signature {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<Signature> {
+        if bytes.len() != 96 {
+            return Err(CoconutError::Deserialization(format!(
+                "Signature must be exactly 96 bytes, got {}",
+                bytes.len()
+            )));
+        }
+
+        let sig1_bytes: &[u8; 48] = &bytes[..48].try_into().expect("Slice size != 48");
+        let sig2_bytes: &[u8; 48] = &bytes[48..].try_into().expect("Slice size != 48");
+
+        let sig1 = try_deserialize_g1_projective(
+            sig1_bytes,
+            CoconutError::Deserialization("Failed to deserialize compressed sig1".to_string()),
+        )?;
+
+        let sig2 = try_deserialize_g1_projective(
+            sig2_bytes,
+            CoconutError::Deserialization("Failed to deserialize compressed sig2".to_string()),
+        )?;
+
+        Ok(Signature(sig1, sig2))
+    }
+}
+
+impl Signature {
+    pub(crate) fn sig1(&self) -> &G1Projective {
+        &self.0
+    }
+
+    pub(crate) fn sig2(&self) -> &G1Projective {
+        &self.1
+    }
+
+    pub fn randomise(&self, params: &Parameters) -> (Signature, Scalar) {
+        let r = params.random_scalar();
+        let r_prime = params.random_scalar();
+        let h_prime = self.0 * r_prime;
+        let s_prime = (self.1 * r_prime) + (h_prime * r);
+        (Signature(h_prime, s_prime), r)
+    }
+
+    pub fn to_bytes(self) -> [u8; 96] {
+        let mut bytes = [0u8; 96];
+        bytes[..48].copy_from_slice(&self.0.to_affine().to_compressed());
+        bytes[48..].copy_from_slice(&self.1.to_affine().to_compressed());
+        bytes
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<Signature> {
+        Signature::try_from(bytes)
+    }
+}
+
+impl Bytable for Signature {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.to_bytes().to_vec()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        Signature::from_bytes(slice)
+    }
+}
+
+impl Base58 for Signature {}
+
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct BlindedSignature(G1Projective, elgamal::Ciphertext);
+
+impl Bytable for BlindedSignature {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.to_bytes().to_vec()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        Self::from_bytes(slice)
+    }
+}
+
+impl Base58 for BlindedSignature {}
+
+impl TryFrom<&[u8]> for BlindedSignature {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<BlindedSignature> {
+        if bytes.len() != 144 {
+            return Err(CoconutError::Deserialization(format!(
+                "BlindedSignature must be exactly 144 bytes, got {}",
+                bytes.len()
+            )));
+        }
+
+        let h_bytes: &[u8; 48] = &bytes[..48].try_into().expect("Slice size != 48");
+
+        let h = try_deserialize_g1_projective(
+            h_bytes,
+            CoconutError::Deserialization("Failed to deserialize compressed h".to_string()),
+        )?;
+        let c_tilde = Ciphertext::try_from(&bytes[48..])?;
+
+        Ok(BlindedSignature(h, c_tilde))
+    }
+}
+
+impl BlindedSignature {
+    pub fn unblind(
+        &self,
+        params: &Parameters,
+        private_key: &elgamal::PrivateKey,
+        partial_verification_key: &VerificationKey,
+        private_attributes: &[Attribute],
+        public_attributes: &[Attribute],
+        commitment_hash: &G1Projective,
+    ) -> Result<Signature> {
+        // parse the signature
+        let h = &self.0;
+        let c = &self.1;
+        let sig2 = private_key.decrypt(c);
+
+        // Verify the commitment hash
+        if !(commitment_hash == h) {
+            return Err(CoconutError::Unblind(
+                "Verification of commitment hash from signature failed".to_string(),
+            ));
+        }
+
+        let alpha = partial_verification_key.alpha;
+
+        let tmp = private_attributes
+            .iter()
+            .chain(public_attributes.iter())
+            .zip(partial_verification_key.beta.iter())
+            .map(|(attr, beta_i)| beta_i * attr)
+            .sum::<G2Projective>();
+
+        // Verify the signature share
+        if !check_bilinear_pairing(
+            &h.to_affine(),
+            &G2Prepared::from((alpha + tmp).to_affine()),
+            &sig2.to_affine(),
+            params.prepared_miller_g2(),
+        ) {
+            return Err(CoconutError::Unblind(
+                "Verification of signature share failed".to_string(),
+            ));
+        }
+
+        Ok(Signature(self.0, sig2))
+    }
+
+    pub fn to_bytes(&self) -> [u8; 144] {
+        let mut bytes = [0u8; 144];
+        bytes[..48].copy_from_slice(&self.0.to_affine().to_compressed());
+        bytes[48..].copy_from_slice(&self.1.to_bytes());
+        bytes
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<BlindedSignature> {
+        BlindedSignature::try_from(bytes)
+    }
+}
+
+// perhaps this should take signature by reference? we'll see how it goes
+pub struct SignatureShare {
+    signature: Signature,
+    index: SignerIndex,
+}
+
+impl SignatureShare {
+    pub fn new(signature: Signature, index: SignerIndex) -> Self {
+        SignatureShare { signature, index }
+    }
+
+    pub fn signature(&self) -> &Signature {
+        &self.signature
+    }
+
+    pub fn index(&self) -> SignerIndex {
+        self.index
+    }
+
+    // pub fn aggregate(shares: &[Self]) -> Result<Signature> {
+    //     aggregate_signature_shares(shares)
+    // }
+}
+
+#[cfg(test)]
+mod tests {
+    use group::GroupEncoding;
+
+    use crate::hash_to_scalar;
+    use crate::scheme::aggregation::{aggregate_signatures, aggregate_verification_keys};
+    use crate::scheme::issuance::{blind_sign, prepare_blind_sign, sign};
+    use crate::scheme::keygen::{keygen, ttp_keygen};
+    use crate::scheme::verification::{prove_bandwidth_credential, verify, verify_credential};
+    use crate::utils::hash_g1;
+
+    use super::*;
+
+    #[test]
+    fn unblind_returns_error_if_integrity_check_on_commitment_hash_fails() {
+        let mut params = Parameters::new(2).unwrap();
+        let private_attributes = params.n_random_scalars(2 as usize);
+        let elgamal_keypair = elgamal::elgamal_keygen(&mut params);
+
+        let lambda =
+            prepare_blind_sign(&mut params, &elgamal_keypair, &private_attributes, &[]).unwrap();
+
+        let keypair1 = keygen(&mut params);
+
+        let sig1 = blind_sign(
+            &mut params,
+            &keypair1.secret_key(),
+            elgamal_keypair.public_key(),
+            &lambda,
+            &[],
+        )
+        .unwrap();
+
+        let wrong_commitment_opening = params.random_scalar();
+        let wrong_commitment = params.gen1() * wrong_commitment_opening;
+        let fake_commitment_hash = hash_g1(wrong_commitment.to_bytes());
+        assert!(sig1
+            .unblind(
+                &params,
+                elgamal_keypair.private_key(),
+                &keypair1.verification_key(),
+                &private_attributes,
+                &[],
+                &fake_commitment_hash,
+            )
+            .is_err());
+    }
+
+    #[test]
+    fn unblind_returns_error_if_signature_verification_fails() {
+        let mut params = Parameters::new(2).unwrap();
+        let private_attributes = vec![hash_to_scalar("Attribute1"), hash_to_scalar("Attribute2")];
+        let private_attributes2 = vec![hash_to_scalar("Attribute3"), hash_to_scalar("Attribute4")];
+        let elgamal_keypair = elgamal::elgamal_keygen(&mut params);
+
+        let lambda =
+            prepare_blind_sign(&mut params, &elgamal_keypair, &private_attributes, &[]).unwrap();
+
+        let keypair1 = keygen(&mut params);
+
+        let sig1 = blind_sign(
+            &mut params,
+            &keypair1.secret_key(),
+            elgamal_keypair.public_key(),
+            &lambda,
+            &[],
+        )
+        .unwrap();
+
+        assert!(sig1
+            .unblind(
+                &params,
+                elgamal_keypair.private_key(),
+                &keypair1.verification_key(),
+                &private_attributes2,
+                &[],
+                &lambda.get_commitment_hash(),
+            )
+            .is_err());
+    }
+
+    #[test]
+    fn verification_on_two_private_attributes() {
+        let mut params = Parameters::new(2).unwrap();
+        let serial_number = params.random_scalar();
+        let binding_number = params.random_scalar();
+        let private_attributes = vec![serial_number, binding_number];
+        let elgamal_keypair = elgamal::elgamal_keygen(&mut params);
+
+        let keypair1 = keygen(&mut params);
+        let keypair2 = keygen(&mut params);
+
+        let lambda =
+            prepare_blind_sign(&mut params, &elgamal_keypair, &private_attributes, &[]).unwrap();
+
+        let sig1 = blind_sign(
+            &mut params,
+            &keypair1.secret_key(),
+            elgamal_keypair.public_key(),
+            &lambda,
+            &[],
+        )
+        .unwrap()
+        .unblind(
+            &params,
+            elgamal_keypair.private_key(),
+            &keypair1.verification_key(),
+            &private_attributes,
+            &[],
+            &lambda.get_commitment_hash(),
+        )
+        .unwrap();
+
+        let sig2 = blind_sign(
+            &mut params,
+            &keypair2.secret_key(),
+            elgamal_keypair.public_key(),
+            &lambda,
+            &[],
+        )
+        .unwrap()
+        .unblind(
+            &params,
+            elgamal_keypair.private_key(),
+            &keypair2.verification_key(),
+            &private_attributes,
+            &[],
+            &lambda.get_commitment_hash(),
+        )
+        .unwrap();
+
+        let theta1 = prove_bandwidth_credential(
+            &mut params,
+            &keypair1.verification_key(),
+            &sig1,
+            serial_number,
+            binding_number,
+        )
+        .unwrap();
+
+        let theta2 = prove_bandwidth_credential(
+            &mut params,
+            &keypair2.verification_key(),
+            &sig2,
+            serial_number,
+            binding_number,
+        )
+        .unwrap();
+
+        assert!(verify_credential(
+            &params,
+            &keypair1.verification_key(),
+            &theta1,
+            &[],
+        ));
+
+        assert!(verify_credential(
+            &params,
+            &keypair2.verification_key(),
+            &theta2,
+            &[],
+        ));
+
+        assert!(!verify_credential(
+            &params,
+            &keypair1.verification_key(),
+            &theta2,
+            &[],
+        ));
+    }
+
+    #[test]
+    fn verification_on_two_public_attributes() {
+        let mut params = Parameters::new(2).unwrap();
+        let attributes = params.n_random_scalars(2);
+
+        let keypair1 = keygen(&mut params);
+        let keypair2 = keygen(&mut params);
+        let sig1 = sign(&mut params, &keypair1.secret_key(), &attributes).unwrap();
+        let sig2 = sign(&mut params, &keypair2.secret_key(), &attributes).unwrap();
+
+        assert!(verify(
+            &params,
+            &keypair1.verification_key(),
+            &attributes,
+            &sig1,
+        ));
+
+        assert!(!verify(
+            &params,
+            &keypair2.verification_key(),
+            &attributes,
+            &sig1,
+        ));
+
+        assert!(!verify(
+            &params,
+            &keypair1.verification_key(),
+            &attributes,
+            &sig2,
+        ));
+    }
+
+    #[test]
+    fn verification_on_two_public_and_two_private_attributes() {
+        let mut params = Parameters::new(4).unwrap();
+        let public_attributes = params.n_random_scalars(2);
+        let serial_number = params.random_scalar();
+        let binding_number = params.random_scalar();
+        let private_attributes = vec![serial_number, binding_number];
+        let elgamal_keypair = elgamal::elgamal_keygen(&mut params);
+
+        let keypair1 = keygen(&mut params);
+        let keypair2 = keygen(&mut params);
+
+        let lambda = prepare_blind_sign(
+            &mut params,
+            &elgamal_keypair,
+            &private_attributes,
+            &public_attributes,
+        )
+        .unwrap();
+
+        let sig1 = blind_sign(
+            &mut params,
+            &keypair1.secret_key(),
+            elgamal_keypair.public_key(),
+            &lambda,
+            &public_attributes,
+        )
+        .unwrap()
+        .unblind(
+            &params,
+            elgamal_keypair.private_key(),
+            &keypair1.verification_key(),
+            &private_attributes,
+            &public_attributes,
+            &lambda.get_commitment_hash(),
+        )
+        .unwrap();
+
+        let sig2 = blind_sign(
+            &mut params,
+            &keypair2.secret_key(),
+            elgamal_keypair.public_key(),
+            &lambda,
+            &public_attributes,
+        )
+        .unwrap()
+        .unblind(
+            &params,
+            elgamal_keypair.private_key(),
+            &keypair2.verification_key(),
+            &private_attributes,
+            &public_attributes,
+            &lambda.get_commitment_hash(),
+        )
+        .unwrap();
+
+        let theta1 = prove_bandwidth_credential(
+            &mut params,
+            &keypair1.verification_key(),
+            &sig1,
+            serial_number,
+            binding_number,
+        )
+        .unwrap();
+
+        let theta2 = prove_bandwidth_credential(
+            &mut params,
+            &keypair2.verification_key(),
+            &sig2,
+            serial_number,
+            binding_number,
+        )
+        .unwrap();
+
+        assert!(verify_credential(
+            &params,
+            &keypair1.verification_key(),
+            &theta1,
+            &public_attributes,
+        ));
+
+        assert!(verify_credential(
+            &params,
+            &keypair2.verification_key(),
+            &theta2,
+            &public_attributes,
+        ));
+
+        assert!(!verify_credential(
+            &params,
+            &keypair1.verification_key(),
+            &theta2,
+            &public_attributes,
+        ));
+    }
+
+    #[test]
+    fn verification_on_two_public_and_two_private_attributes_from_two_signers() {
+        let mut params = Parameters::new(4).unwrap();
+        let public_attributes = params.n_random_scalars(2);
+        let serial_number = params.random_scalar();
+        let binding_number = params.random_scalar();
+        let private_attributes = vec![serial_number, binding_number];
+        let elgamal_keypair = elgamal::elgamal_keygen(&params);
+
+        let keypairs = ttp_keygen(&mut params, 2, 3).unwrap();
+
+        let lambda = prepare_blind_sign(
+            &mut params,
+            &elgamal_keypair,
+            &private_attributes,
+            &public_attributes,
+        )
+        .unwrap();
+
+        let sigs = keypairs
+            .iter()
+            .map(|keypair| {
+                blind_sign(
+                    &mut params,
+                    &keypair.secret_key(),
+                    elgamal_keypair.public_key(),
+                    &lambda,
+                    &public_attributes,
+                )
+                .unwrap()
+                .unblind(
+                    &params,
+                    elgamal_keypair.private_key(),
+                    &keypair.verification_key(),
+                    &private_attributes,
+                    &public_attributes,
+                    &lambda.get_commitment_hash(),
+                )
+                .unwrap()
+            })
+            .collect::<Vec<_>>();
+
+        let vks = keypairs
+            .into_iter()
+            .map(|keypair| keypair.verification_key())
+            .collect::<Vec<_>>();
+
+        let mut attributes = Vec::with_capacity(private_attributes.len() + public_attributes.len());
+        attributes.extend_from_slice(&private_attributes);
+        attributes.extend_from_slice(&public_attributes);
+
+        let aggr_vk = aggregate_verification_keys(&vks[..2], Some(&[1, 2])).unwrap();
+        let aggr_sig =
+            aggregate_signatures(&params, &aggr_vk, &attributes, &sigs[..2], Some(&[1, 2]))
+                .unwrap();
+
+        let theta = prove_bandwidth_credential(
+            &mut params,
+            &aggr_vk,
+            &aggr_sig,
+            serial_number,
+            binding_number,
+        )
+        .unwrap();
+
+        assert!(verify_credential(
+            &params,
+            &aggr_vk,
+            &theta,
+            &public_attributes,
+        ));
+
+        // taking different subset of keys and credentials
+        let aggr_vk = aggregate_verification_keys(&vks[1..], Some(&[2, 3])).unwrap();
+        let aggr_sig =
+            aggregate_signatures(&params, &aggr_vk, &attributes, &sigs[1..], Some(&[2, 3]))
+                .unwrap();
+
+        let theta = prove_bandwidth_credential(
+            &mut params,
+            &aggr_vk,
+            &aggr_sig,
+            serial_number,
+            binding_number,
+        )
+        .unwrap();
+
+        assert!(verify_credential(
+            &params,
+            &aggr_vk,
+            &theta,
+            &public_attributes,
+        ));
+    }
+
+    #[test]
+    fn signature_bytes_roundtrip() {
+        let params = Parameters::default();
+        let r = params.random_scalar();
+        let s = params.random_scalar();
+        let signature = Signature(params.gen1() * r, params.gen1() * s);
+        let bytes = signature.to_bytes();
+
+        // also make sure it is equivalent to the internal g1 compressed bytes concatenated
+        let expected_bytes = [
+            signature.0.to_affine().to_compressed(),
+            signature.1.to_affine().to_compressed(),
+        ]
+        .concat();
+        assert_eq!(expected_bytes, bytes);
+        assert_eq!(signature, Signature::try_from(&bytes[..]).unwrap())
+    }
+
+    #[test]
+    fn blinded_signature_bytes_roundtrip() {
+        let params = Parameters::default();
+        let r = params.random_scalar();
+        let s = params.random_scalar();
+        let t = params.random_scalar();
+        let blinded_sig = BlindedSignature(
+            params.gen1() * t,
+            Ciphertext(params.gen1() * r, params.gen1() * s),
+        );
+        let bytes = blinded_sig.to_bytes();
+
+        // also make sure it is equivalent to the internal g1 compressed bytes concatenated
+        let expected_bytes = [
+            blinded_sig.0.to_affine().to_compressed(),
+            blinded_sig.1 .0.to_affine().to_compressed(),
+            blinded_sig.1 .1.to_affine().to_compressed(),
+        ]
+        .concat();
+        assert_eq!(expected_bytes, bytes);
+        assert_eq!(blinded_sig, BlindedSignature::try_from(&bytes[..]).unwrap())
+    }
+}
@@ -0,0 +1,90 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use bls12_381::{G1Affine, G2Affine, G2Prepared, Scalar};
+use ff::Field;
+use group::Curve;
+use rand::thread_rng;
+
+use crate::error::{CoconutError, Result};
+use crate::utils::hash_g1;
+
+/// System-wide parameters used for the protocol
+pub struct Parameters {
+    /// Generator of the G1 group
+    g1: G1Affine,
+
+    /// Additional generators of the G1 group
+    hs: Vec<G1Affine>,
+
+    /// Generator of the G2 group
+    g2: G2Affine,
+
+    /// Precomputed G2 generator used for the miller loop
+    _g2_prepared_miller: G2Prepared,
+}
+
+impl Parameters {
+    pub fn new(num_attributes: u32) -> Result<Parameters> {
+        if num_attributes == 0 {
+            return Err(CoconutError::Setup(
+                "Tried to setup the scheme for 0 attributes".to_string(),
+            ));
+        }
+
+        let hs = (1..=num_attributes)
+            .map(|i| hash_g1(format!("h{}", i)).to_affine())
+            .collect();
+
+        Ok(Parameters {
+            g1: G1Affine::generator(),
+            hs,
+            g2: G2Affine::generator(),
+            _g2_prepared_miller: G2Prepared::from(G2Affine::generator()),
+        })
+    }
+
+    pub(crate) fn gen1(&self) -> &G1Affine {
+        &self.g1
+    }
+
+    pub(crate) fn gen2(&self) -> &G2Affine {
+        &self.g2
+    }
+
+    pub(crate) fn prepared_miller_g2(&self) -> &G2Prepared {
+        &self._g2_prepared_miller
+    }
+
+    pub(crate) fn gen_hs(&self) -> &[G1Affine] {
+        &self.hs
+    }
+
+    pub fn random_scalar(&self) -> Scalar {
+        // lazily-initialized thread-local random number generator, seeded by the system
+        let mut rng = thread_rng();
+        Scalar::random(&mut rng)
+    }
+
+    pub fn n_random_scalars(&self, n: usize) -> Vec<Scalar> {
+        (0..n).map(|_| self.random_scalar()).collect()
+    }
+}
+
+pub fn setup(num_attributes: u32) -> Result<Parameters> {
+    Parameters::new(num_attributes)
+}
+
+// for ease of use in tests requiring params
+// TODO: not sure if this will have to go away when tests require some specific number of generators
+#[cfg(test)]
+impl Default for Parameters {
+    fn default() -> Self {
+        Parameters {
+            g1: G1Affine::generator(),
+            hs: Vec::new(),
+            g2: G2Affine::generator(),
+            _g2_prepared_miller: G2Prepared::from(G2Affine::generator()),
+        }
+    }
+}
@@ -0,0 +1,296 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use core::ops::Neg;
+use std::convert::TryFrom;
+use std::convert::TryInto;
+
+use bls12_381::{multi_miller_loop, G1Affine, G2Prepared, G2Projective, Scalar};
+use group::{Curve, Group};
+
+use crate::error::{CoconutError, Result};
+use crate::proofs::ProofKappaZeta;
+use crate::scheme::setup::Parameters;
+use crate::scheme::Signature;
+use crate::scheme::VerificationKey;
+use crate::traits::{Base58, Bytable};
+use crate::utils::try_deserialize_g2_projective;
+use crate::Attribute;
+
+// TODO NAMING: this whole thing
+// Theta
+#[derive(Debug)]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct Theta {
+    // blinded_message (kappa)
+    pub blinded_message: G2Projective,
+    // blinded serial number (zeta)
+    pub blinded_serial_number: G2Projective,
+    // sigma
+    pub credential: Signature,
+    // pi_v
+    pub pi_v: ProofKappaZeta,
+}
+
+impl TryFrom<&[u8]> for Theta {
+    type Error = CoconutError;
+
+    fn try_from(bytes: &[u8]) -> Result<Theta> {
+        if bytes.len() < 288 {
+            return Err(
+                CoconutError::Deserialization(
+                    format!("Tried to deserialize theta with insufficient number of bytes, expected >= 288, got {}", bytes.len()),
+                ));
+        }
+
+        let blinded_message_bytes = bytes[..96].try_into().unwrap();
+        let blinded_message = try_deserialize_g2_projective(
+            &blinded_message_bytes,
+            CoconutError::Deserialization(
+                "failed to deserialize the blinded message (kappa)".to_string(),
+            ),
+        )?;
+
+        let blinded_serial_number_bytes = bytes[96..192].try_into().unwrap();
+        let blinded_serial_number = try_deserialize_g2_projective(
+            &blinded_serial_number_bytes,
+            CoconutError::Deserialization(
+                "failed to deserialize the blinded serial number (zeta)".to_string(),
+            ),
+        )?;
+        let credential = Signature::try_from(&bytes[192..288])?;
+
+        let pi_v = ProofKappaZeta::from_bytes(&bytes[288..])?;
+
+        Ok(Theta {
+            blinded_message,
+            blinded_serial_number,
+            credential,
+            pi_v,
+        })
+    }
+}
+
+impl Theta {
+    fn verify_proof(&self, params: &Parameters, verification_key: &VerificationKey) -> bool {
+        self.pi_v.verify(
+            params,
+            verification_key,
+            &self.blinded_message,
+            &self.blinded_serial_number,
+        )
+    }
+
+    // blinded message (kappa)  || blinded serial number (zeta) || credential || pi_v
+    pub fn to_bytes(&self) -> Vec<u8> {
+        let blinded_message_bytes = self.blinded_message.to_affine().to_compressed();
+        let blinded_serial_number_bytes = self.blinded_serial_number.to_affine().to_compressed();
+        let credential_bytes = self.credential.to_bytes();
+        let proof_bytes = self.pi_v.to_bytes();
+
+        let mut bytes = Vec::with_capacity(288 + proof_bytes.len());
+        bytes.extend_from_slice(&blinded_message_bytes);
+        bytes.extend_from_slice(&blinded_serial_number_bytes);
+        bytes.extend_from_slice(&credential_bytes);
+        bytes.extend_from_slice(&proof_bytes);
+
+        bytes
+    }
+
+    pub fn from_bytes(bytes: &[u8]) -> Result<Theta> {
+        Theta::try_from(bytes)
+    }
+}
+
+impl Bytable for Theta {
+    fn to_byte_vec(&self) -> Vec<u8> {
+        self.to_bytes()
+    }
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self> {
+        Theta::try_from(slice)
+    }
+}
+
+impl Base58 for Theta {}
+
+pub fn compute_kappa(
+    params: &Parameters,
+    verification_key: &VerificationKey,
+    private_attributes: &[Attribute],
+    blinding_factor: Scalar,
+) -> G2Projective {
+    params.gen2() * blinding_factor
+        + verification_key.alpha
+        + private_attributes
+            .iter()
+            .zip(verification_key.beta.iter())
+            .map(|(priv_attr, beta_i)| beta_i * priv_attr)
+            .sum::<G2Projective>()
+}
+
+pub fn compute_zeta(params: &Parameters, serial_number: Attribute) -> G2Projective {
+    params.gen2() * serial_number
+}
+
+pub fn prove_bandwidth_credential(
+    params: &Parameters,
+    verification_key: &VerificationKey,
+    signature: &Signature,
+    serial_number: Attribute,
+    binding_number: Attribute,
+) -> Result<Theta> {
+    if verification_key.beta.len() < 2 {
+        return Err(
+            CoconutError::Verification(
+                format!("Tried to prove a credential for higher than supported by the provided verification key number of attributes (max: {}, requested: 2)",
+                        verification_key.beta.len()
+                )));
+    }
+
+    // Randomize the signature
+    let (signature_prime, sign_blinding_factor) = signature.randomise(params);
+
+    // blinded_message : kappa in the paper.
+    // Value kappa is needed since we want to show a signature sigma'.
+    // In order to verify sigma' we need both the verification key vk and the message m.
+    // However, we do not want to reveal m to whomever we are showing the signature.
+    // Thus, we need kappa which allows us to verify sigma'. In particular,
+    // kappa is computed on m as input, but thanks to the use or random value r,
+    // it does not reveal any information about m.
+    let private_attributes = vec![serial_number, binding_number];
+    let blinded_message = compute_kappa(
+        params,
+        verification_key,
+        &private_attributes,
+        sign_blinding_factor,
+    );
+
+    // zeta is a commitment to the serial number (i.e., a public value associated with the serial number)
+    let blinded_serial_number = compute_zeta(params, serial_number);
+
+    let pi_v = ProofKappaZeta::construct(
+        params,
+        verification_key,
+        &serial_number,
+        &binding_number,
+        &sign_blinding_factor,
+        &blinded_message,
+        &blinded_serial_number,
+    );
+
+    Ok(Theta {
+        blinded_message,
+        blinded_serial_number,
+        credential: signature_prime,
+        pi_v,
+    })
+}
+
+/// Checks whether e(P, Q) * e(-R, S) == id
+pub fn check_bilinear_pairing(p: &G1Affine, q: &G2Prepared, r: &G1Affine, s: &G2Prepared) -> bool {
+    // checking e(P, Q) * e(-R, S) == id
+    // is equivalent to checking e(P, Q) == e(R, S)
+    // but requires only a single final exponentiation rather than two of them
+    // and therefore, as seen via benchmarks.rs, is almost 50% faster
+    // (1.47ms vs 2.45ms, tested on R9 5900X)
+
+    let multi_miller = multi_miller_loop(&[(p, q), (&r.neg(), s)]);
+    multi_miller.final_exponentiation().is_identity().into()
+}
+
+pub fn verify_credential(
+    params: &Parameters,
+    verification_key: &VerificationKey,
+    theta: &Theta,
+    public_attributes: &[Attribute],
+) -> bool {
+    if public_attributes.len() + theta.pi_v.private_attributes_len() > verification_key.beta.len() {
+        return false;
+    }
+
+    if !theta.verify_proof(params, verification_key) {
+        return false;
+    }
+
+    let kappa = if public_attributes.is_empty() {
+        theta.blinded_message
+    } else {
+        let signed_public_attributes = public_attributes
+            .iter()
+            .zip(
+                verification_key
+                    .beta
+                    .iter()
+                    .skip(theta.pi_v.private_attributes_len()),
+            )
+            .map(|(pub_attr, beta_i)| beta_i * pub_attr)
+            .sum::<G2Projective>();
+
+        theta.blinded_message + signed_public_attributes
+    };
+
+    check_bilinear_pairing(
+        &theta.credential.0.to_affine(),
+        &G2Prepared::from(kappa.to_affine()),
+        &(theta.credential.1).to_affine(),
+        params.prepared_miller_g2(),
+    ) && !bool::from(theta.credential.0.is_identity())
+}
+
+// Used in tests only
+#[cfg(test)]
+pub fn verify(
+    params: &Parameters,
+    verification_key: &VerificationKey,
+    public_attributes: &[Attribute],
+    sig: &Signature,
+) -> bool {
+    let kappa = (verification_key.alpha
+        + public_attributes
+            .iter()
+            .zip(verification_key.beta.iter())
+            .map(|(m_i, b_i)| b_i * m_i)
+            .sum::<G2Projective>())
+    .to_affine();
+
+    check_bilinear_pairing(
+        &sig.0.to_affine(),
+        &G2Prepared::from(kappa),
+        &sig.1.to_affine(),
+        params.prepared_miller_g2(),
+    ) && !bool::from(sig.0.is_identity())
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::scheme::keygen::keygen;
+    use crate::scheme::setup::setup;
+
+    use super::*;
+
+    #[test]
+    fn theta_bytes_roundtrip() {
+        let mut params = setup(2).unwrap();
+
+        let keypair = keygen(&mut params);
+        let r = params.random_scalar();
+        let s = params.random_scalar();
+
+        let signature = Signature(params.gen1() * r, params.gen1() * s);
+        let serial_number = params.random_scalar();
+        let binding_number = params.random_scalar();
+
+        let theta = prove_bandwidth_credential(
+            &mut params,
+            &keypair.verification_key(),
+            &signature,
+            serial_number,
+            binding_number,
+        )
+        .unwrap();
+
+        let bytes = theta.to_bytes();
+        assert_eq!(Theta::try_from(bytes.as_slice()).unwrap(), theta);
+    }
+}
@@ -0,0 +1,106 @@
+use crate::{
+    aggregate_signature_shares, aggregate_verification_keys, blind_sign, elgamal_keygen,
+    prepare_blind_sign, prove_bandwidth_credential, setup, ttp_keygen, verify_credential,
+    CoconutError, Signature, SignatureShare, VerificationKey,
+};
+
+#[test]
+fn main() -> Result<(), CoconutError> {
+    let params = setup(5)?;
+
+    let public_attributes = params.n_random_scalars(2);
+    let serial_number = params.random_scalar();
+    let binding_number = params.random_scalar();
+    let private_attributes = vec![serial_number, binding_number];
+
+    let elgamal_keypair = elgamal_keygen(&params);
+
+    // generate commitment and encryption
+    let blind_sign_request = prepare_blind_sign(
+        &params,
+        &elgamal_keypair,
+        &private_attributes,
+        &public_attributes,
+    )?;
+
+    // generate_keys
+    let coconut_keypairs = ttp_keygen(&params, 2, 3)?;
+
+    let verification_keys: Vec<VerificationKey> = coconut_keypairs
+        .iter()
+        .map(|keypair| keypair.verification_key())
+        .collect();
+
+    // aggregate verification keys
+    let verification_key = aggregate_verification_keys(&verification_keys, Some(&[1, 2, 3]))?;
+
+    // generate blinded signatures
+    let mut blinded_signatures = Vec::new();
+
+    for keypair in coconut_keypairs {
+        let blinded_signature = blind_sign(
+            &params,
+            &keypair.secret_key(),
+            &elgamal_keypair.public_key(),
+            &blind_sign_request,
+            &public_attributes,
+        )?;
+        blinded_signatures.push(blinded_signature)
+    }
+
+    // Unblind
+
+    let unblinded_signatures: Vec<Signature> = blinded_signatures
+        .into_iter()
+        .zip(verification_keys.iter())
+        .map(|(signature, verification_key)| {
+            signature
+                .unblind(
+                    &params,
+                    &elgamal_keypair.private_key(),
+                    &verification_key,
+                    &private_attributes,
+                    &public_attributes,
+                    &blind_sign_request.get_commitment_hash(),
+                )
+                .unwrap()
+        })
+        .collect();
+
+    // Aggregate signatures
+
+    let signature_shares: Vec<SignatureShare> = unblinded_signatures
+        .iter()
+        .enumerate()
+        .map(|(idx, signature)| SignatureShare::new(*signature, (idx + 1) as u64))
+        .collect();
+
+    let mut attributes = Vec::with_capacity(private_attributes.len() + public_attributes.len());
+    attributes.extend_from_slice(&private_attributes);
+    attributes.extend_from_slice(&public_attributes);
+
+    // Randomize credentials and generate any cryptographic material to verify them
+    let signature =
+        aggregate_signature_shares(&params, &verification_key, &attributes, &signature_shares)?;
+
+    // Generate cryptographic material to verify them
+
+    let theta = prove_bandwidth_credential(
+        &params,
+        &verification_key,
+        &signature,
+        serial_number,
+        binding_number,
+    )?;
+
+    // Verify credentials
+
+    assert!(verify_credential(
+        &params,
+        &verification_key,
+        &theta,
+        &public_attributes,
+    ));
+
+    Ok(())
+}
@@ -0,0 +1 @@
+mod e2e;
@@ -0,0 +1,22 @@
+use crate::CoconutError;
+
+pub trait Bytable
+where
+    Self: Sized,
+{
+    fn to_byte_vec(&self) -> Vec<u8>;
+
+    fn try_from_byte_slice(slice: &[u8]) -> Result<Self, CoconutError>;
+}
+
+pub trait Base58
+where
+    Self: Bytable,
+{
+    fn try_from_bs58<S: AsRef<str>>(x: S) -> Result<Self, CoconutError> {
+        Self::try_from_byte_slice(&bs58::decode(x.as_ref()).into_vec().unwrap())
+    }
+    fn to_bs58(&self) -> String {
+        bs58::encode(self.to_byte_vec()).into_string()
+    }
+}
@@ -0,0 +1,386 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use core::iter::Sum;
+use core::ops::Mul;
+use std::convert::TryInto;
+
+use bls12_381::hash_to_curve::{ExpandMsgXmd, HashToCurve, HashToField};
+use bls12_381::{G1Affine, G1Projective, G2Affine, G2Projective, Scalar};
+use ff::Field;
+
+use crate::error::{CoconutError, Result};
+use crate::scheme::setup::Parameters;
+use crate::scheme::SignerIndex;
+
+pub struct Polynomial {
+    coefficients: Vec<Scalar>,
+}
+
+impl Polynomial {
+    // for polynomial of degree n, we generate n+1 values
+    // (for example for degree 1, like y = x + 2, we need [2,1])
+    pub fn new_random(params: &Parameters, degree: u64) -> Self {
+        Polynomial {
+            coefficients: params.n_random_scalars((degree + 1) as usize),
+        }
+    }
+
+    /// Evaluates the polynomial at point x.
+    pub fn evaluate(&self, x: &Scalar) -> Scalar {
+        if self.coefficients.is_empty() {
+            Scalar::zero()
+            // if x is zero then we can ignore most of the expensive computation and
+            // just return the last term of the polynomial
+        } else if x.is_zero() {
+            // we checked that coefficients are not empty so unwrap here is fine
+            *self.coefficients.first().unwrap()
+        } else {
+            self.coefficients
+                .iter()
+                .enumerate()
+                // coefficient[n] * x ^ n
+                .map(|(i, coefficient)| coefficient * x.pow(&[i as u64, 0, 0, 0]))
+                .sum()
+        }
+    }
+}
+
+#[inline]
+fn generate_lagrangian_coefficients_at_origin(points: &[u64]) -> Vec<Scalar> {
+    let x = Scalar::zero();
+
+    points
+        .iter()
+        .enumerate()
+        .map(|(i, point_i)| {
+            let mut numerator = Scalar::one();
+            let mut denominator = Scalar::one();
+            let xi = Scalar::from(*point_i);
+
+            for (j, point_j) in points.iter().enumerate() {
+                if j != i {
+                    let xj = Scalar::from(*point_j);
+
+                    // numerator = (x - xs[0]) * ... * (x - xs[j]), j != i
+                    numerator *= x - xj;
+
+                    // denominator = (xs[i] - x[0]) * ... * (xs[i] - x[j]), j != i
+                    denominator *= xi - xj;
+                }
+            }
+            // numerator / denominator
+            numerator * denominator.invert().unwrap()
+        })
+        .collect()
+}
+
+/// Performs a Lagrange interpolation at the origin for a polynomial defined by `points` and `values`.
+/// It can be used for Scalars, G1 and G2 points.
+pub(crate) fn perform_lagrangian_interpolation_at_origin<T>(
+    points: &[SignerIndex],
+    values: &[T],
+) -> Result<T>
+where
+    T: Sum,
+    for<'a> &'a T: Mul<Scalar, Output = T>,
+{
+    if points.is_empty() || values.is_empty() {
+        return Err(CoconutError::Interpolation(
+            "Tried to perform lagrangian interpolation for an empty set of coordinates".to_string(),
+        ));
+    }
+
+    if points.len() != values.len() {
+        return Err(CoconutError::Interpolation(
+            "Tried to perform lagrangian interpolation for an incomplete set of coordinates"
+                .to_string(),
+        ));
+    }
+
+    let coefficients = generate_lagrangian_coefficients_at_origin(points);
+
+    Ok(coefficients
+        .into_iter()
+        .zip(values.iter())
+        .map(|(coeff, val)| val * coeff)
+        .sum())
+}
+
+// A temporary way of hashing particular message into G1.
+// Implementation idea was taken from `threshold_crypto`:
+// https://github.com/poanetwork/threshold_crypto/blob/7709462f2df487ada3bb3243060504b5881f2628/src/lib.rs#L691
+// Eventually it should get replaced by, most likely, the osswu map
+// method once ideally it's implemented inside the pairing crate.
+
+// note: I have absolutely no idea what are the correct domains for those. I just used whatever
+// was given in the test vectors of `Hashing to Elliptic Curves draft-irtf-cfrg-hash-to-curve-11`
+
+// https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-11#appendix-J.9.1
+const G1_HASH_DOMAIN: &[u8] = b"QUUX-V01-CS02-with-BLS12381G1_XMD:SHA-256_SSWU_RO_";
+
+// https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-hash-to-curve-11#appendix-K.1
+const SCALAR_HASH_DOMAIN: &[u8] = b"QUUX-V01-CS02-with-expander";
+
+pub(crate) fn hash_g1<M: AsRef<[u8]>>(msg: M) -> G1Projective {
+    <G1Projective as HashToCurve<ExpandMsgXmd<sha2::Sha256>>>::hash_to_curve(msg, G1_HASH_DOMAIN)
+}
+
+pub fn hash_to_scalar<M: AsRef<[u8]>>(msg: M) -> Scalar {
+    let mut output = vec![Scalar::zero()];
+
+    Scalar::hash_to_field::<ExpandMsgXmd<sha2::Sha256>>(
+        msg.as_ref(),
+        SCALAR_HASH_DOMAIN,
+        &mut output,
+    );
+    output[0]
+}
+
+pub(crate) fn try_deserialize_scalar_vec(
+    expected_len: u64,
+    bytes: &[u8],
+    err: CoconutError,
+) -> Result<Vec<Scalar>> {
+    if bytes.len() != expected_len as usize * 32 {
+        return Err(err);
+    }
+
+    let mut out = Vec::with_capacity(expected_len as usize);
+    for i in 0..expected_len as usize {
+        let s_bytes = bytes[i * 32..(i + 1) * 32].try_into().unwrap();
+        let s = match Into::<Option<Scalar>>::into(Scalar::from_bytes(&s_bytes)) {
+            None => return Err(err),
+            Some(scalar) => scalar,
+        };
+        out.push(s)
+    }
+
+    Ok(out)
+}
+
+pub(crate) fn try_deserialize_scalar(bytes: &[u8; 32], err: CoconutError) -> Result<Scalar> {
+    Into::<Option<Scalar>>::into(Scalar::from_bytes(bytes)).ok_or(err)
+}
+
+pub(crate) fn try_deserialize_g1_projective(
+    bytes: &[u8; 48],
+    err: CoconutError,
+) -> Result<G1Projective> {
+    Into::<Option<G1Affine>>::into(G1Affine::from_compressed(bytes))
+        .ok_or(err)
+        .map(G1Projective::from)
+}
+
+pub(crate) fn try_deserialize_g2_projective(
+    bytes: &[u8; 96],
+    err: CoconutError,
+) -> Result<G2Projective> {
+    Into::<Option<G2Affine>>::into(G2Affine::from_compressed(bytes))
+        .ok_or(err)
+        .map(G2Projective::from)
+}
+
+// use core::fmt;
+// #[cfg(feature = "serde")]
+// use serde::de::Visitor;
+// #[cfg(feature = "serde")]
+// use serde::{self, Deserialize, Deserializer, Serialize, Serializer};
+//
+// // #[cfg(feature = "serde")]
+// #[serde(remote = "Scalar")]
+// pub(crate) struct ScalarDef(pub Scalar);
+//
+// // #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
+//
+// impl Serialize for ScalarDef {
+//     fn serialize<S>(&self, serializer: S) -> core::result::Result<S::Ok, S::Error>
+//     where
+//         S: Serializer,
+//     {
+//         use serde::ser::SerializeTuple;
+//         let mut tup = serializer.serialize_tuple(32)?;
+//         for byte in self.0.to_bytes().iter() {
+//             tup.serialize_element(byte)?;
+//         }
+//         tup.end()
+//     }
+// }
+//
+// impl<'de> Deserialize<'de> for ScalarDef {
+//     fn deserialize<D>(deserializer: D) -> core::result::Result<Self, D::Error>
+//     where
+//         D: Deserializer<'de>,
+//     {
+//         struct ScalarVisitor;
+//
+//         impl<'de> Visitor<'de> for ScalarVisitor {
+//             type Value = ScalarDef;
+//
+//             fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+//                 formatter.write_str("a 32-byte canonical bls12_381 scalar")
+//             }
+//
+//             fn visit_seq<A>(self, mut seq: A) -> core::result::Result<ScalarDef, A::Error>
+//             where
+//                 A: serde::de::SeqAccess<'de>,
+//             {
+//                 let mut bytes = [0u8; 32];
+//                 for i in 0..32 {
+//                     bytes[i] = seq
+//                         .next_element()?
+//                         .ok_or_else(|| serde::de::Error::invalid_length(i, &"expected 32 bytes"))?;
+//                 }
+//
+//                 let res = Scalar::from_bytes(&bytes);
+//                 if res.is_some().into() {
+//                     Ok(ScalarDef(res.unwrap()))
+//                 } else {
+//                     Err(serde::de::Error::custom(
+//                         &"scalar was not canonically encoded",
+//                     ))
+//                 }
+//             }
+//         }
+//
+//         deserializer.deserialize_tuple(32, ScalarVisitor)
+//     }
+// }
+//
+// #[cfg(feature = "serde")]
+// pub(crate) struct G1ProjectiveSerdeHelper(Scalar);
+//
+// #[cfg(feature = "serde")]
+// pub(crate) struct G2ProjectiveSerdeHelper(Scalar);
+
+#[cfg(test)]
+mod tests {
+    use rand::RngCore;
+
+    use super::*;
+
+    #[test]
+    fn polynomial_evaluation() {
+        // y = 42 (it should be 42 regardless of x)
+        let poly = Polynomial {
+            coefficients: vec![Scalar::from(42)],
+        };
+
+        assert_eq!(Scalar::from(42), poly.evaluate(&Scalar::from(1)));
+        assert_eq!(Scalar::from(42), poly.evaluate(&Scalar::from(0)));
+        assert_eq!(Scalar::from(42), poly.evaluate(&Scalar::from(10)));
+
+        // y = x + 10, at x = 2 (exp: 12)
+        let poly = Polynomial {
+            coefficients: vec![Scalar::from(10), Scalar::from(1)],
+        };
+
+        assert_eq!(Scalar::from(12), poly.evaluate(&Scalar::from(2)));
+
+        // y = x^4 - 5x^2 + 2x - 3, at x = 3 (exp: 39)
+        let poly = Polynomial {
+            coefficients: vec![
+                (-Scalar::from(3)),
+                Scalar::from(2),
+                (-Scalar::from(5)),
+                Scalar::zero(),
+                Scalar::from(1),
+            ],
+        };
+
+        assert_eq!(Scalar::from(39), poly.evaluate(&Scalar::from(3)));
+
+        // empty polynomial
+        let poly = Polynomial {
+            coefficients: vec![],
+        };
+
+        // should always be 0
+        assert_eq!(Scalar::from(0), poly.evaluate(&Scalar::from(1)));
+        assert_eq!(Scalar::from(0), poly.evaluate(&Scalar::from(0)));
+        assert_eq!(Scalar::from(0), poly.evaluate(&Scalar::from(10)));
+    }
+
+    #[test]
+    fn performing_lagrangian_scalar_interpolation_at_origin() {
+        // x^2 + 3
+        // x, f(x):
+        // 1, 4,
+        // 2, 7,
+        // 3, 12,
+        let points = vec![1, 2, 3];
+        let values = vec![Scalar::from(4), Scalar::from(7), Scalar::from(12)];
+
+        assert_eq!(
+            Scalar::from(3),
+            perform_lagrangian_interpolation_at_origin(&points, &values).unwrap()
+        );
+
+        // x^3 + 3x^2 - 5x + 11
+        // x, f(x):
+        // 1, 10
+        // 2, 21
+        // 3, 50
+        // 4, 103
+        let points = vec![1, 2, 3, 4];
+        let values = vec![
+            Scalar::from(10),
+            Scalar::from(21),
+            Scalar::from(50),
+            Scalar::from(103),
+        ];
+
+        assert_eq!(
+            Scalar::from(11),
+            perform_lagrangian_interpolation_at_origin(&points, &values).unwrap()
+        );
+
+        // more points than it is required
+        // x^2 + x + 10
+        // x, f(x)
+        // 1, 12
+        // 2, 16
+        // 3, 22
+        // 4, 30
+        // 5, 40
+        let points = vec![1, 2, 3, 4, 5];
+        let values = vec![
+            Scalar::from(12),
+            Scalar::from(16),
+            Scalar::from(22),
+            Scalar::from(30),
+            Scalar::from(40),
+        ];
+
+        assert_eq!(
+            Scalar::from(10),
+            perform_lagrangian_interpolation_at_origin(&points, &values).unwrap()
+        );
+    }
+
+    #[test]
+    fn hash_g1_sanity_check() {
+        let mut rng = rand::thread_rng();
+        let mut msg1 = [0u8; 1024];
+        rng.fill_bytes(&mut msg1);
+        let mut msg2 = [0u8; 1024];
+        rng.fill_bytes(&mut msg2);
+
+        assert_eq!(hash_g1(msg1), hash_g1(msg1));
+        assert_eq!(hash_g1(msg2), hash_g1(msg2));
+        assert_ne!(hash_g1(msg1), hash_g1(msg2));
+    }
+
+    #[test]
+    fn hash_scalar_sanity_check() {
+        let mut rng = rand::thread_rng();
+        let mut msg1 = [0u8; 1024];
+        rng.fill_bytes(&mut msg1);
+        let mut msg2 = [0u8; 1024];
+        rng.fill_bytes(&mut msg2);
+
+        assert_eq!(hash_to_scalar(msg1), hash_to_scalar(msg1));
+        assert_eq!(hash_to_scalar(msg2), hash_to_scalar(msg2));
+        assert_ne!(hash_to_scalar(msg1), hash_to_scalar(msg2));
+    }
+}
@@ -22,9 +22,9 @@ const CLIENT_IDENTITY_SIZE: usize = identity::PUBLIC_KEY_LENGTH;
 #[derive(Debug)]
 pub enum RecipientFormattingError {
    MalformedRecipientError,
-    MalformedIdentityError(identity::KeyRecoveryError),
+    MalformedIdentityError(identity::Ed25519RecoveryError),
    MalformedEncryptionKeyError(encryption::KeyRecoveryError),
-    MalformedGatewayError(identity::KeyRecoveryError),
+    MalformedGatewayError(identity::Ed25519RecoveryError),
 }

 impl fmt::Display for RecipientFormattingError {
@@ -13,7 +13,7 @@ use std::net::SocketAddr;

 #[derive(Debug)]
 pub enum GatewayConversionError {
-    InvalidIdentityKey(identity::KeyRecoveryError),
+    InvalidIdentityKey(identity::Ed25519RecoveryError),
    InvalidSphinxKey(encryption::KeyRecoveryError),
    InvalidAddress(String, io::Error),
    InvalidStake,
@@ -26,8 +26,8 @@ impl From<encryption::KeyRecoveryError> for GatewayConversionError {
    }
 }

-impl From<identity::KeyRecoveryError> for GatewayConversionError {
-    fn from(err: identity::KeyRecoveryError) -> Self {
+impl From<identity::Ed25519RecoveryError> for GatewayConversionError {
+    fn from(err: identity::Ed25519RecoveryError) -> Self {
        GatewayConversionError::InvalidIdentityKey(err)
    }
 }
@@ -125,7 +125,7 @@ impl<'a> TryFrom<&'a GatewayBond> for Node {

        Ok(Node {
            owner: bond.owner.as_str().to_owned(),
-            stake: bond.bond_amount.amount.into(),
+            stake: bond.pledge_amount.amount.into(),
            location: bond.gateway.location.clone(),
            host,
            mix_host,
@@ -13,7 +13,7 @@ use std::net::SocketAddr;

 #[derive(Debug)]
 pub enum MixnodeConversionError {
-    InvalidIdentityKey(identity::KeyRecoveryError),
+    InvalidIdentityKey(identity::Ed25519RecoveryError),
    InvalidSphinxKey(encryption::KeyRecoveryError),
    InvalidAddress(String, io::Error),
    InvalidStake,
@@ -26,8 +26,8 @@ impl From<encryption::KeyRecoveryError> for MixnodeConversionError {
    }
 }

-impl From<identity::KeyRecoveryError> for MixnodeConversionError {
-    fn from(err: identity::KeyRecoveryError) -> Self {
+impl From<identity::Ed25519RecoveryError> for MixnodeConversionError {
+    fn from(err: identity::Ed25519RecoveryError) -> Self {
        MixnodeConversionError::InvalidIdentityKey(err)
    }
 }
@@ -117,7 +117,7 @@ impl<'a> TryFrom<&'a MixNodeBond> for Node {

        Ok(Node {
            owner: bond.owner.as_str().to_owned(),
-            stake: bond.bond_amount.amount.into(),
+            stake: bond.pledge_amount.amount.into(),
            delegation: bond.total_delegation.amount.into(),
            host,
            mix_host,
@@ -0,0 +1,13 @@
+[workspace]
+members = ["erc20-bridge", "mixnet", "vesting"]
+
+[profile.release]
+opt-level = 3
+debug = false
+rpath = false
+lto = true
+debug-assertions = false
+codegen-units = 1
+panic = 'abort'
+incremental = false
+overflow-checks = true
@@ -89,8 +89,9 @@ dependencies = [

 [[package]]
 name = "cosmwasm-crypto"
-version = "0.14.1"
-source = "git+https://github.com/jstuczyn/cosmwasm?branch=0.14.1-updatedk256#308781cd5f33b0e996176c6b500793d3648c0f7b"
+version = "1.0.0-beta2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c16b255449b3f5cd7fa4b79acd5225b5185655261087a3d8aaac44f88a0e23e9"
 dependencies = [
 "digest 0.9.0",
 "ed25519-zebra",
@@ -101,16 +102,18 @@ dependencies = [

 [[package]]
 name = "cosmwasm-derive"
-version = "0.14.1"
-source = "git+https://github.com/jstuczyn/cosmwasm?branch=0.14.1-updatedk256#308781cd5f33b0e996176c6b500793d3648c0f7b"
+version = "1.0.0-beta2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "abad1a6ff427a2f66890a4dce6354b4563cd07cee91a942300e011c921c09ed2"
 dependencies = [
 "syn",
 ]

 [[package]]
 name = "cosmwasm-std"
-version = "0.14.1"
-source = "git+https://github.com/jstuczyn/cosmwasm?branch=0.14.1-updatedk256#308781cd5f33b0e996176c6b500793d3648c0f7b"
+version = "1.0.0-beta2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1660ee3d5734672e1eb4f0ceda403e2d83345e15143a48845f340f3252ce99a6"
 dependencies = [
 "base64",
 "cosmwasm-crypto",
@@ -124,8 +127,9 @@ dependencies = [

 [[package]]
 name = "cosmwasm-storage"
-version = "0.14.1"
-source = "git+https://github.com/jstuczyn/cosmwasm?branch=0.14.1-updatedk256#308781cd5f33b0e996176c6b500793d3648c0f7b"
+version = "1.0.0-beta2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf3b4efe3b4f86df668520a02e9a29c23eea99b64dfcacb0e59b98346418af7f"
 dependencies = [
 "cosmwasm-std",
 "serde",
@@ -5,22 +5,9 @@ edition = "2018"

 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

-[workspace] # adding a blank workspace to keep it out of the global workspace.
-
 [lib]
 crate-type = ["cdylib", "rlib"]

-[profile.release]
-opt-level = 3
-debug = false
-rpath = false
-lto = true
-debug-assertions = false
-codegen-units = 1
-panic = 'abort'
-incremental = false
-overflow-checks = true
-
 [features]
 # for more explicit tests, cargo test --features=backtraces
 backtraces = ["cosmwasm-std/backtraces"]
@@ -31,9 +18,8 @@ config = { path = "../../common/config"}
 [dependencies]
 erc20-bridge-contract = { path = "../../common/erc20-bridge-contract" }

-# this branch is identical to 0.14.1 with addition of updated k256 dependency required to help poor cargo choose correct version
-cosmwasm-std = { git = "https://github.com/jstuczyn/cosmwasm", branch="0.14.1-updatedk256", features = ["iterator"] }
-cosmwasm-storage = { git = "https://github.com/jstuczyn/cosmwasm", branch="0.14.1-updatedk256", features = ["iterator"] }
+cosmwasm-std = "1.0.0-beta2"
+cosmwasm-storage = "1.0.0-beta2"

 schemars = "0.8"
 serde = { version = "1.0.103", default-features = false, features = ["derive"] }
@@ -68,7 +68,7 @@ pub mod tests {

    #[test]
    fn initialize_contract() {
-        let mut deps = mock_dependencies(&[]);
+        let mut deps = mock_dependencies();
        let env = mock_env();
        let msg = InstantiateMsg {};
        let info = mock_info("creator", &[]);
@@ -11,7 +11,7 @@ pub mod helpers {
    use erc20_bridge_contract::payment::Payment;

    pub fn init_contract() -> OwnedDeps<MemoryStorage, MockApi, MockQuerier<Empty>> {
-        let mut deps = mock_dependencies(&[]);
+        let mut deps = mock_dependencies();
        let msg = InstantiateMsg {};
        let env = mock_env();
        let info = mock_info("creator", &[]);
@@ -12,22 +12,9 @@ exclude = [

 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

-[workspace] # adding a blank workspace to keep it out of the global workspace.
-
 [lib]
 crate-type = ["cdylib", "rlib"]

-[profile.release]
-opt-level = 3
-debug = false
-rpath = false
-lto = true
-debug-assertions = false
-codegen-units = 1
-panic = 'abort'
-incremental = false
-overflow-checks = true
-
 [features]
 # for more explicit tests, cargo test --features=backtraces
 backtraces = ["cosmwasm-std/backtraces"]
@@ -35,18 +22,23 @@ backtraces = ["cosmwasm-std/backtraces"]
 [dependencies]
 mixnet-contract = { path = "../../common/mixnet-contract" }
 config = { path = "../../common/config"}
+vesting-contract = { path = "../vesting" }

-# this branch is identical to 0.14.1 with addition of updated k256 dependency required to help poor cargo choose correct version
-cosmwasm-std = { git = "https://github.com/jstuczyn/cosmwasm", branch="0.14.1-updatedk256", features = ["iterator"] }
-cosmwasm-storage = { git = "https://github.com/jstuczyn/cosmwasm", branch="0.14.1-updatedk256", features = ["iterator"] }
-
-#cosmwasm-std = { version = "0.14.1", features = ["iterator"] }
-#cosmwasm-storage = { version = "0.14.1", features = ["iterator"] }
+cosmwasm-std = "1.0.0-beta2"
+cosmwasm-storage = "1.0.0-beta2"
+cw-storage-plus = "0.10.3"

+bs58 = "0.4.0"
 schemars = "0.8"
 serde = { version = "1.0.103", default-features = false, features = ["derive"] }
 thiserror = { version = "1.0.23" }

 [dev-dependencies]
-cosmwasm-schema = { version = "0.14.0" }
+cosmwasm-schema = "1.0.0-beta2"
 fixed = "1.1"
+rand_chacha = "0.2"
+rand = "0.7"
+crypto = { path = "../../common/crypto" }
+
+[build-dependencies]
+vergen = { version = "5", default-features = false, features = ["build", "git", "rustc"] }
@@ -0,0 +1,8 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use vergen::{vergen, Config};
+
+fn main() {
+    vergen(Config::default()).expect("failed to extract build metadata")
+}
@@ -5,7 +5,6 @@ extern crate mixnet_contract;

 use cosmwasm_schema::{export_schema, remove_schemas, schema_for};
 use mixnet_contract::{ExecuteMsg, InstantiateMsg, MixNodeBond, QueryMsg};
-use mixnet_contracts::state::State;
 use std::env::current_dir;
 use std::fs::create_dir_all;

@@ -18,6 +17,5 @@ fn main() {
    export_schema(&schema_for!(InstantiateMsg), &out_dir);
    export_schema(&schema_for!(ExecuteMsg), &out_dir);
    export_schema(&schema_for!(QueryMsg), &out_dir);
-    export_schema(&schema_for!(State), &out_dir);
    export_schema(&schema_for!(MixNodeBond), &out_dir);
 }
@@ -69,10 +69,10 @@
    {
      "type": "object",
      "required": [
-        "update_state_params"
+        "update_contract_settings"
      ],
      "properties": {
-        "update_state_params": {
+        "update_contract_settings": {
          "$ref": "#/definitions/StateParams"
        }
      },
@@ -346,4 +346,4 @@
      "type": "string"
    }
  }
-}
+}
@@ -101,10 +101,10 @@
    {
      "type": "object",
      "required": [
-        "state_params"
+        "contract_settings_params"
      ],
      "properties": {
-        "state_params": {
+        "contract_settings_params": {
          "type": "object"
        }
      },
@@ -321,4 +321,4 @@
      "type": "string"
    }
  }
-}
+}
@@ -1,30 +1,35 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use std::u128;
-
-use crate::helpers::calculate_epoch_reward_rate;
-use crate::state::State;
-use crate::storage::{config, layer_distribution};
-use crate::{error::ContractError, queries, transactions};
-use config::defaults::REWARDING_VALIDATOR_ADDRESS;
-use cosmwasm_std::{
-    entry_point, to_binary, Addr, Decimal, Deps, DepsMut, Env, MessageInfo, QueryResponse,
-    Response, Uint128,
+use crate::delegations::queries::query_all_network_delegations_paged;
+use crate::delegations::queries::query_delegator_delegations_paged;
+use crate::delegations::queries::query_mixnode_delegation;
+use crate::delegations::queries::query_mixnode_delegations_paged;
+use crate::error::ContractError;
+use crate::gateways::queries::query_gateways_paged;
+use crate::gateways::queries::query_owns_gateway;
+use crate::mixnet_contract_settings::models::ContractState;
+use crate::mixnet_contract_settings::queries::query_rewarding_interval;
+use crate::mixnet_contract_settings::queries::{
+    query_contract_settings_params, query_contract_version,
 };
-use mixnet_contract::{ExecuteMsg, InstantiateMsg, MigrateMsg, QueryMsg, StateParams};
-
-pub const INITIAL_DEFAULT_EPOCH_LENGTH: u32 = 2;
+use crate::mixnet_contract_settings::storage as mixnet_params_storage;
+use crate::mixnodes::bonding_queries as mixnode_queries;
+use crate::mixnodes::bonding_queries::query_mixnodes_paged;
+use crate::mixnodes::layer_queries::query_layer_distribution;
+use crate::rewards::queries::query_reward_pool;
+use crate::rewards::queries::{query_circulating_supply, query_rewarding_status};
+use crate::rewards::storage as rewards_storage;
+use cosmwasm_std::{
+    entry_point, to_binary, Addr, Deps, DepsMut, Env, MessageInfo, QueryResponse, Response, Uint128,
+};
+use mixnet_contract::{ContractStateParams, ExecuteMsg, InstantiateMsg, MigrateMsg, QueryMsg};

 /// Constant specifying minimum of coin required to bond a gateway
-pub const INITIAL_GATEWAY_BOND: Uint128 = Uint128(100_000000);
+pub const INITIAL_GATEWAY_PLEDGE: Uint128 = Uint128::new(100_000_000);

 /// Constant specifying minimum of coin required to bond a mixnode
-pub const INITIAL_MIXNODE_BOND: Uint128 = Uint128(100_000000);
-
-// percentage annual increase. Given starting value of x, we expect to have 1.1x at the end of the year
-pub const INITIAL_MIXNODE_BOND_REWARD_RATE: u64 = 110;
-pub const INITIAL_MIXNODE_DELEGATION_REWARD_RATE: u64 = 110;
+pub const INITIAL_MIXNODE_PLEDGE: Uint128 = Uint128::new(100_000_000);

 pub const INITIAL_MIXNODE_REWARDED_SET_SIZE: u32 = 200;
 pub const INITIAL_MIXNODE_ACTIVE_SET_SIZE: u32 = 100;
@@ -32,37 +37,26 @@ pub const INITIAL_MIXNODE_ACTIVE_SET_SIZE: u32 = 100;
 pub const INITIAL_REWARD_POOL: u128 = 250_000_000_000_000;
 pub const EPOCH_REWARD_PERCENT: u8 = 2; // Used to calculate epoch reward pool
 pub const DEFAULT_SYBIL_RESISTANCE_PERCENT: u8 = 30;
+pub const DEFAULT_ACTIVE_SET_WORK_FACTOR: u8 = 10;

-// We'll be assuming a few more things, profit margin and cost function. Since we don't have relialable package measurement, we'll be using uptime. We'll also set the value of 1 Nym to 1 $, to be able to translate epoch costs to Nyms. We'll also assume a cost of 40$ per epoch(month), converting that to Nym at our 1$ rate translates to 40_000_000 uNyms
-pub const DEFAULT_COST_PER_EPOCH: u32 = 40_000_000;
-
-fn default_initial_state(owner: Addr, env: Env) -> State {
-    let mixnode_bond_reward_rate = Decimal::percent(INITIAL_MIXNODE_BOND_REWARD_RATE);
-    let mixnode_delegation_reward_rate = Decimal::percent(INITIAL_MIXNODE_DELEGATION_REWARD_RATE);
-
-    State {
+fn default_initial_state(
+    owner: Addr,
+    rewarding_validator_address: Addr,
+    env: Env,
+) -> ContractState {
+    ContractState {
        owner,
-        rewarding_validator_address: Addr::unchecked(REWARDING_VALIDATOR_ADDRESS), // we trust our hardcoded value
-        params: StateParams {
-            epoch_length: INITIAL_DEFAULT_EPOCH_LENGTH,
-            minimum_mixnode_bond: INITIAL_MIXNODE_BOND,
-            minimum_gateway_bond: INITIAL_GATEWAY_BOND,
-            mixnode_bond_reward_rate,
-            mixnode_delegation_reward_rate,
+        rewarding_validator_address,
+        params: ContractStateParams {
+            minimum_mixnode_pledge: INITIAL_MIXNODE_PLEDGE,
+            minimum_gateway_pledge: INITIAL_GATEWAY_PLEDGE,
            mixnode_rewarded_set_size: INITIAL_MIXNODE_REWARDED_SET_SIZE,
            mixnode_active_set_size: INITIAL_MIXNODE_ACTIVE_SET_SIZE,
+            active_set_work_factor: DEFAULT_ACTIVE_SET_WORK_FACTOR,
        },
        rewarding_interval_starting_block: env.block.height,
        latest_rewarding_interval_nonce: 0,
        rewarding_in_progress: false,
-        mixnode_epoch_bond_reward: calculate_epoch_reward_rate(
-            INITIAL_DEFAULT_EPOCH_LENGTH,
-            mixnode_bond_reward_rate,
-        ),
-        mixnode_epoch_delegation_reward: calculate_epoch_reward_rate(
-            INITIAL_DEFAULT_EPOCH_LENGTH,
-            mixnode_delegation_reward_rate,
-        ),
    }
 }

@@ -76,12 +70,15 @@ pub fn instantiate(
    deps: DepsMut,
    env: Env,
    info: MessageInfo,
-    _msg: InstantiateMsg,
+    msg: InstantiateMsg,
 ) -> Result<Response, ContractError> {
-    let state = default_initial_state(info.sender, env);
+    let rewarding_validator_address = deps.api.addr_validate(&msg.rewarding_validator_address)?;
+    let state = default_initial_state(info.sender, rewarding_validator_address, env);
+
+    mixnet_params_storage::CONTRACT_STATE.save(deps.storage, &state)?;
+    mixnet_params_storage::LAYERS.save(deps.storage, &Default::default())?;
+    rewards_storage::REWARD_POOL.save(deps.storage, &Uint128::new(INITIAL_REWARD_POOL))?;

-    config(deps.storage).save(&state)?;
-    layer_distribution(deps.storage).save(&Default::default())?;
    Ok(Response::default())
 }

@@ -94,34 +91,42 @@ pub fn execute(
    msg: ExecuteMsg,
 ) -> Result<Response, ContractError> {
    match msg {
-        ExecuteMsg::BondMixnode { mix_node } => {
-            transactions::try_add_mixnode(deps, env, info, mix_node)
-        }
-        ExecuteMsg::UnbondMixnode {} => transactions::try_remove_mixnode(deps, info),
-        ExecuteMsg::BondGateway { gateway } => {
-            transactions::try_add_gateway(deps, env, info, gateway)
-        }
-        ExecuteMsg::UnbondGateway {} => transactions::try_remove_gateway(deps, info),
-        ExecuteMsg::UpdateStateParams(params) => {
-            transactions::try_update_state_params(deps, info, params)
-        }
-        ExecuteMsg::RewardMixnode {
-            identity,
-            uptime,
-            rewarding_interval_nonce,
-        } => transactions::try_reward_mixnode(
+        ExecuteMsg::BondMixnode {
+            mix_node,
+            owner_signature,
+        } => crate::mixnodes::transactions::try_add_mixnode(
            deps,
            env,
            info,
-            identity,
-            uptime,
-            rewarding_interval_nonce,
+            mix_node,
+            owner_signature,
        ),
-        ExecuteMsg::RewardMixnodeV2 {
+        ExecuteMsg::UnbondMixnode {} => {
+            crate::mixnodes::transactions::try_remove_mixnode(deps, info)
+        }
+        ExecuteMsg::BondGateway {
+            gateway,
+            owner_signature,
+        } => crate::gateways::transactions::try_add_gateway(
+            deps,
+            env,
+            info,
+            gateway,
+            owner_signature,
+        ),
+        ExecuteMsg::UnbondGateway {} => {
+            crate::gateways::transactions::try_remove_gateway(deps, info)
+        }
+        ExecuteMsg::UpdateContractStateParams(params) => {
+            crate::mixnet_contract_settings::transactions::try_update_contract_settings(
+                deps, info, params,
+            )
+        }
+        ExecuteMsg::RewardMixnode {
            identity,
            params,
            rewarding_interval_nonce,
-        } => transactions::try_reward_mixnode_v2(
+        } => crate::rewards::transactions::try_reward_mixnode(
            deps,
            env,
            info,
@@ -130,88 +135,161 @@ pub fn execute(
            rewarding_interval_nonce,
        ),
        ExecuteMsg::DelegateToMixnode { mix_identity } => {
-            transactions::try_delegate_to_mixnode(deps, env, info, mix_identity)
+            crate::delegations::transactions::try_delegate_to_mixnode(deps, env, info, mix_identity)
        }
        ExecuteMsg::UndelegateFromMixnode { mix_identity } => {
-            transactions::try_remove_delegation_from_mixnode(deps, info, mix_identity)
+            crate::delegations::transactions::try_remove_delegation_from_mixnode(
+                deps,
+                info,
+                mix_identity,
+            )
        }
        ExecuteMsg::BeginMixnodeRewarding {
            rewarding_interval_nonce,
-        } => transactions::try_begin_mixnode_rewarding(deps, env, info, rewarding_interval_nonce),
+        } => crate::rewards::transactions::try_begin_mixnode_rewarding(
+            deps,
+            env,
+            info,
+            rewarding_interval_nonce,
+        ),
        ExecuteMsg::FinishMixnodeRewarding {
            rewarding_interval_nonce,
-        } => transactions::try_finish_mixnode_rewarding(deps, info, rewarding_interval_nonce),
+        } => crate::rewards::transactions::try_finish_mixnode_rewarding(
+            deps,
+            info,
+            rewarding_interval_nonce,
+        ),
+        ExecuteMsg::RewardNextMixDelegators {
+            mix_identity,
+            rewarding_interval_nonce,
+        } => crate::rewards::transactions::try_reward_next_mixnode_delegators(
+            deps,
+            info,
+            mix_identity,
+            rewarding_interval_nonce,
+        ),
+        ExecuteMsg::DelegateToMixnodeOnBehalf {
+            mix_identity,
+            delegate,
+        } => crate::delegations::transactions::try_delegate_to_mixnode_on_behalf(
+            deps,
+            env,
+            info,
+            mix_identity,
+            delegate,
+        ),
+        ExecuteMsg::UndelegateFromMixnodeOnBehalf {
+            mix_identity,
+            delegate,
+        } => crate::delegations::transactions::try_remove_delegation_from_mixnode_on_behalf(
+            deps,
+            info,
+            mix_identity,
+            delegate,
+        ),
+        ExecuteMsg::BondMixnodeOnBehalf {
+            mix_node,
+            owner,
+            owner_signature,
+        } => crate::mixnodes::transactions::try_add_mixnode_on_behalf(
+            deps,
+            env,
+            info,
+            mix_node,
+            owner,
+            owner_signature,
+        ),
+        ExecuteMsg::UnbondMixnodeOnBehalf { owner } => {
+            crate::mixnodes::transactions::try_remove_mixnode_on_behalf(deps, info, owner)
+        }
+        ExecuteMsg::BondGatewayOnBehalf {
+            gateway,
+            owner,
+            owner_signature,
+        } => crate::gateways::transactions::try_add_gateway_on_behalf(
+            deps,
+            env,
+            info,
+            gateway,
+            owner,
+            owner_signature,
+        ),
+        ExecuteMsg::UnbondGatewayOnBehalf { owner } => {
+            crate::gateways::transactions::try_remove_gateway_on_behalf(deps, info, owner)
+        }
    }
 }

 #[entry_point]
 pub fn query(deps: Deps, _env: Env, msg: QueryMsg) -> Result<QueryResponse, ContractError> {
    let query_res = match msg {
+        QueryMsg::GetContractVersion {} => to_binary(&query_contract_version()),
        QueryMsg::GetMixNodes { start_after, limit } => {
-            to_binary(&queries::query_mixnodes_paged(deps, start_after, limit)?)
+            to_binary(&query_mixnodes_paged(deps, start_after, limit)?)
        }
        QueryMsg::GetGateways { limit, start_after } => {
-            to_binary(&queries::query_gateways_paged(deps, start_after, limit)?)
+            to_binary(&query_gateways_paged(deps, start_after, limit)?)
        }
        QueryMsg::OwnsMixnode { address } => {
-            to_binary(&queries::query_owns_mixnode(deps, address)?)
+            to_binary(&mixnode_queries::query_owns_mixnode(deps, address)?)
        }
-        QueryMsg::OwnsGateway { address } => {
-            to_binary(&queries::query_owns_gateway(deps, address)?)
-        }
-        QueryMsg::StateParams {} => to_binary(&queries::query_state_params(deps)),
-        QueryMsg::CurrentRewardingInterval {} => {
-            to_binary(&queries::query_rewarding_interval(deps))
-        }
-        QueryMsg::LayerDistribution {} => to_binary(&queries::query_layer_distribution(deps)),
-        QueryMsg::GetMixDelegations {
+        QueryMsg::OwnsGateway { address } => to_binary(&query_owns_gateway(deps, address)?),
+        QueryMsg::StateParams {} => to_binary(&query_contract_settings_params(deps)?),
+        QueryMsg::CurrentRewardingInterval {} => to_binary(&query_rewarding_interval(deps)?),
+        QueryMsg::LayerDistribution {} => to_binary(&query_layer_distribution(deps)?),
+        QueryMsg::GetMixnodeDelegations {
            mix_identity,
            start_after,
            limit,
-        } => to_binary(&queries::query_mixnode_delegations_paged(
+        } => to_binary(&query_mixnode_delegations_paged(
            deps,
            mix_identity,
            start_after,
            limit,
        )?),
-        QueryMsg::GetAllMixDelegations { start_after, limit } => to_binary(
-            &queries::query_all_mixnode_delegations_paged(deps, start_after, limit)?,
+        QueryMsg::GetAllNetworkDelegations { start_after, limit } => to_binary(
+            &query_all_network_delegations_paged(deps, start_after, limit)?,
        ),
-        QueryMsg::GetReverseMixDelegations {
-            delegation_owner,
+        QueryMsg::GetDelegatorDelegations {
+            delegator: delegation_owner,
            start_after,
            limit,
-        } => to_binary(&queries::query_reverse_mixnode_delegations_paged(
+        } => to_binary(&query_delegator_delegations_paged(
            deps,
            delegation_owner,
            start_after,
            limit,
        )?),
-        QueryMsg::GetMixDelegation {
+        QueryMsg::GetDelegationDetails {
            mix_identity,
-            address,
-        } => to_binary(&queries::query_mixnode_delegation(
-            deps,
-            mix_identity,
-            address,
-        )?),
-        QueryMsg::GetRewardPool {} => to_binary(&queries::query_reward_pool(deps)),
-        QueryMsg::GetCirculatingSupply {} => to_binary(&queries::query_circulating_supply(deps)),
+            delegator,
+        } => to_binary(&query_mixnode_delegation(deps, mix_identity, delegator)?),
+        QueryMsg::GetRewardPool {} => to_binary(&query_reward_pool(deps)?),
+        QueryMsg::GetCirculatingSupply {} => to_binary(&query_circulating_supply(deps)?),
        QueryMsg::GetEpochRewardPercent {} => to_binary(&EPOCH_REWARD_PERCENT),
        QueryMsg::GetSybilResistancePercent {} => to_binary(&DEFAULT_SYBIL_RESISTANCE_PERCENT),
+        QueryMsg::GetRewardingStatus {
+            mix_identity,
+            rewarding_interval_nonce,
+        } => to_binary(&query_rewarding_status(
+            deps,
+            mix_identity,
+            rewarding_interval_nonce,
+        )?),
    };

    Ok(query_res?)
 }
 #[entry_point]
 pub fn migrate(_deps: DepsMut, _env: Env, _msg: MigrateMsg) -> Result<Response, ContractError> {
-    Ok(Default::default())
+    todo!("ACTIVE_STATE_WORK_FACTOR to State");
+    // Ok(Default::default())
 }

 #[cfg(test)]
 pub mod tests {
    use super::*;
-    use crate::support::tests::helpers::*;
+    use crate::support::tests::test_helpers;
    use config::defaults::DENOM;
    use cosmwasm_std::testing::{mock_dependencies, mock_env, mock_info};
    use cosmwasm_std::{coins, from_binary};
@@ -219,9 +297,11 @@ pub mod tests {

    #[test]
    fn initialize_contract() {
-        let mut deps = mock_dependencies(&[]);
+        let mut deps = mock_dependencies();
        let env = mock_env();
-        let msg = InstantiateMsg {};
+        let msg = InstantiateMsg {
+            rewarding_validator_address: config::defaults::REWARDING_VALIDATOR_ADDRESS.to_string(),
+        };
        let info = mock_info("creator", &[]);

        let res = instantiate(deps.as_mut(), env.clone(), info, msg).unwrap();
@@ -243,7 +323,7 @@ pub mod tests {
        // Contract balance should match what we initialized it as
        assert_eq!(
            coins(0, DENOM),
-            query_contract_balance(env.contract.address, deps)
+            test_helpers::query_contract_balance(env.contract.address, deps)
        );
    }
 }
@@ -0,0 +1,6 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub(crate) mod queries;
+pub(crate) mod storage;
+pub(crate) mod transactions;
@@ -0,0 +1,649 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use super::storage;
+use crate::error::ContractError;
+use cosmwasm_std::Deps;
+use cosmwasm_std::Order;
+use cosmwasm_std::StdResult;
+use cw_storage_plus::{Bound, PrimaryKey};
+use mixnet_contract::PagedAllDelegationsResponse;
+use mixnet_contract::PagedDelegatorDelegationsResponse;
+use mixnet_contract::PagedMixDelegationsResponse;
+use mixnet_contract::{Delegation, IdentityKey};
+
+pub(crate) fn query_all_network_delegations_paged(
+    deps: Deps,
+    start_after: Option<(IdentityKey, String)>,
+    limit: Option<u32>,
+) -> StdResult<PagedAllDelegationsResponse> {
+    let limit = limit
+        .unwrap_or(storage::DELEGATION_PAGE_DEFAULT_LIMIT)
+        .min(storage::DELEGATION_PAGE_MAX_LIMIT) as usize;
+
+    let start = start_after
+        .map(|start| start.joined_key())
+        .map(Bound::exclusive);
+
+    let delegations = storage::delegations()
+        .range(deps.storage, start, None, Order::Ascending)
+        .take(limit)
+        .map(|record| record.map(|r| r.1))
+        .collect::<StdResult<Vec<_>>>()?;
+
+    let start_next_after = delegations
+        .last()
+        .map(|delegation| delegation.storage_key());
+
+    Ok(PagedAllDelegationsResponse::new(
+        delegations,
+        start_next_after,
+    ))
+}
+
+pub(crate) fn query_delegator_delegations_paged(
+    deps: Deps,
+    delegation_owner: String,
+    start_after: Option<IdentityKey>,
+    limit: Option<u32>,
+) -> StdResult<PagedDelegatorDelegationsResponse> {
+    let validated_owner = deps.api.addr_validate(&delegation_owner)?;
+
+    let limit = limit
+        .unwrap_or(storage::DELEGATION_PAGE_DEFAULT_LIMIT)
+        .min(storage::DELEGATION_PAGE_MAX_LIMIT) as usize;
+    let start = start_after
+        .map(|mix_identity| Bound::Exclusive((mix_identity, validated_owner.clone()).joined_key()));
+
+    let delegations = storage::delegations()
+        .idx
+        .owner
+        .prefix(validated_owner)
+        .range(deps.storage, start, None, Order::Ascending)
+        .take(limit)
+        .map(|record| record.map(|r| r.1))
+        .collect::<StdResult<Vec<_>>>()?;
+
+    let start_next_after = delegations
+        .last()
+        .map(|delegation| delegation.node_identity());
+
+    Ok(PagedDelegatorDelegationsResponse::new(
+        delegations,
+        start_next_after,
+    ))
+}
+
+// queries for delegation value of given address for particular node
+pub(crate) fn query_mixnode_delegation(
+    deps: Deps,
+    mix_identity: IdentityKey,
+    delegator: String,
+) -> Result<Delegation, ContractError> {
+    let validated_delegator = deps.api.addr_validate(&delegator)?;
+    let storage_key = (mix_identity.clone(), validated_delegator.clone()).joined_key();
+
+    storage::delegations()
+        .may_load(deps.storage, storage_key)?
+        .ok_or(ContractError::NoMixnodeDelegationFound {
+            identity: mix_identity,
+            address: validated_delegator,
+        })
+}
+
+pub(crate) fn query_mixnode_delegations_paged(
+    deps: Deps,
+    mix_identity: IdentityKey,
+    start_after: Option<String>,
+    limit: Option<u32>,
+) -> StdResult<PagedMixDelegationsResponse> {
+    let limit = limit
+        .unwrap_or(storage::DELEGATION_PAGE_DEFAULT_LIMIT)
+        .min(storage::DELEGATION_PAGE_MAX_LIMIT) as usize;
+
+    let start = start_after
+        .map(|addr| deps.api.addr_validate(&addr))
+        .transpose()?
+        .map(|addr| Bound::Exclusive((mix_identity.clone(), addr).joined_key()));
+
+    let delegations = storage::delegations()
+        .idx
+        .mixnode
+        .prefix(mix_identity)
+        .range(deps.storage, start, None, Order::Ascending)
+        .take(limit)
+        .map(|record| record.map(|r| r.1))
+        .collect::<StdResult<Vec<_>>>()?;
+
+    let start_next_after = delegations.last().map(|delegation| delegation.owner());
+
+    Ok(PagedMixDelegationsResponse::new(
+        delegations,
+        start_next_after,
+    ))
+}
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+    use crate::support::tests::test_helpers;
+    use config::defaults::DENOM;
+    use cosmwasm_std::{coin, Addr, Storage};
+
+    pub fn store_n_mix_delegations(n: u32, storage: &mut dyn Storage, node_identity: &str) {
+        for i in 0..n {
+            let address = format!("address{}", i);
+            test_helpers::save_dummy_delegation(storage, node_identity, address);
+        }
+    }
+
+    #[cfg(test)]
+    mod querying_for_mixnode_delegations_paged {
+        use super::*;
+        use mixnet_contract::IdentityKey;
+
+        #[test]
+        fn retrieval_obeys_limits() {
+            let mut deps = test_helpers::init_contract();
+            let limit = 2;
+            let node_identity: IdentityKey = "foo".into();
+            store_n_mix_delegations(100, &mut deps.storage, &node_identity);
+
+            let page1 = query_mixnode_delegations_paged(
+                deps.as_ref(),
+                node_identity,
+                None,
+                Option::from(limit),
+            )
+            .unwrap();
+            assert_eq!(limit, page1.delegations.len() as u32);
+        }
+
+        #[test]
+        fn retrieval_has_default_limit() {
+            let mut deps = test_helpers::init_contract();
+            let node_identity: IdentityKey = "foo".into();
+            store_n_mix_delegations(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+                &mut deps.storage,
+                &node_identity,
+            );
+
+            // query without explicitly setting a limit
+            let page1 =
+                query_mixnode_delegations_paged(deps.as_ref(), node_identity, None, None).unwrap();
+            assert_eq!(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT,
+                page1.delegations.len() as u32
+            );
+        }
+
+        #[test]
+        fn retrieval_has_max_limit() {
+            let mut deps = test_helpers::init_contract();
+            let node_identity: IdentityKey = "foo".into();
+            store_n_mix_delegations(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+                &mut deps.storage,
+                &node_identity,
+            );
+
+            // query with a crazily high limit in an attempt to use too many resources
+            let crazy_limit = 1000 * storage::DELEGATION_PAGE_DEFAULT_LIMIT;
+            let page1 = query_mixnode_delegations_paged(
+                deps.as_ref(),
+                node_identity,
+                None,
+                Option::from(crazy_limit),
+            )
+            .unwrap();
+
+            // we default to a decent sized upper bound instead
+            let expected_limit = storage::DELEGATION_PAGE_MAX_LIMIT;
+            assert_eq!(expected_limit, page1.delegations.len() as u32);
+        }
+
+        #[test]
+        fn pagination_works() {
+            let mut deps = test_helpers::init_contract();
+            let node_identity: IdentityKey = "foo".into();
+
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "100");
+
+            let per_page = 2;
+            let page1 = query_mixnode_delegations_paged(
+                deps.as_ref(),
+                node_identity.clone(),
+                None,
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            // page should have 1 result on it
+            assert_eq!(1, page1.delegations.len());
+
+            // save another
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "200");
+
+            // page1 should have 2 results on it
+            let page1 = query_mixnode_delegations_paged(
+                deps.as_ref(),
+                node_identity.clone(),
+                None,
+                Option::from(per_page),
+            )
+            .unwrap();
+            assert_eq!(2, page1.delegations.len());
+
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "300");
+
+            // page1 still has 2 results
+            let page1 = query_mixnode_delegations_paged(
+                deps.as_ref(),
+                node_identity.clone(),
+                None,
+                Option::from(per_page),
+            )
+            .unwrap();
+            assert_eq!(2, page1.delegations.len());
+            assert_eq!("200".to_string(), page1.start_next_after.unwrap());
+
+            // retrieving the next page should start after the last key on this page
+            let start_after = "200".to_string();
+            let page2 = query_mixnode_delegations_paged(
+                deps.as_ref(),
+                node_identity.clone(),
+                Option::from(start_after),
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            assert_eq!(1, page2.delegations.len());
+
+            // save another one
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "400");
+
+            let start_after = "200".to_string();
+            let page2 = query_mixnode_delegations_paged(
+                deps.as_ref(),
+                node_identity,
+                Option::from(start_after),
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            // now we have 2 pages, with 2 results on the second page
+            assert_eq!(2, page2.delegations.len());
+        }
+    }
+
+    #[cfg(test)]
+    mod querying_for_all_mixnode_delegations_paged {
+        use super::*;
+        use crate::support::tests::test_helpers;
+        use mixnet_contract::IdentityKey;
+
+        #[test]
+        fn retrieval_obeys_limits() {
+            let mut deps = test_helpers::init_contract();
+            let limit = 2;
+            let node_identity: IdentityKey = "foo".into();
+            store_n_mix_delegations(100, &mut deps.storage, &node_identity);
+
+            let page1 =
+                query_all_network_delegations_paged(deps.as_ref(), None, Option::from(limit))
+                    .unwrap();
+            assert_eq!(limit, page1.delegations.len() as u32);
+        }
+
+        #[test]
+        fn retrieval_has_default_limit() {
+            let mut deps = test_helpers::init_contract();
+            let node_identity: IdentityKey = "foo".into();
+            store_n_mix_delegations(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+                &mut deps.storage,
+                &node_identity,
+            );
+
+            // query without explicitly setting a limit
+            let page1 = query_all_network_delegations_paged(deps.as_ref(), None, None).unwrap();
+            assert_eq!(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT,
+                page1.delegations.len() as u32
+            );
+        }
+
+        #[test]
+        fn retrieval_has_max_limit() {
+            let mut deps = test_helpers::init_contract();
+            let node_identity: IdentityKey = "foo".into();
+            store_n_mix_delegations(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+                &mut deps.storage,
+                &node_identity,
+            );
+
+            // query with a crazily high limit in an attempt to use too many resources
+            let crazy_limit = 1000 * storage::DELEGATION_PAGE_DEFAULT_LIMIT;
+            let page1 =
+                query_all_network_delegations_paged(deps.as_ref(), None, Option::from(crazy_limit))
+                    .unwrap();
+
+            // we default to a decent sized upper bound instead
+            let expected_limit = storage::DELEGATION_PAGE_MAX_LIMIT;
+            assert_eq!(expected_limit, page1.delegations.len() as u32);
+        }
+
+        #[test]
+        fn pagination_works() {
+            let mut deps = test_helpers::init_contract();
+            let node_identity: IdentityKey = "foo".into();
+
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "100");
+
+            let per_page = 2;
+            let page1 =
+                query_all_network_delegations_paged(deps.as_ref(), None, Option::from(per_page))
+                    .unwrap();
+
+            // page should have 1 result on it
+            assert_eq!(1, page1.delegations.len());
+
+            // save another
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "200");
+
+            // page1 should have 2 results on it
+            let page1 =
+                query_all_network_delegations_paged(deps.as_ref(), None, Option::from(per_page))
+                    .unwrap();
+            assert_eq!(2, page1.delegations.len());
+
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "300");
+
+            // page1 still has 2 results
+            let page1 =
+                query_all_network_delegations_paged(deps.as_ref(), None, Option::from(per_page))
+                    .unwrap();
+            assert_eq!(2, page1.delegations.len());
+
+            // retrieving the next page should start after the last key on this page
+            let start_after = page1.start_next_after.unwrap();
+            let page2 = query_all_network_delegations_paged(
+                deps.as_ref(),
+                Option::from(start_after.clone()),
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            assert_eq!(1, page2.delegations.len());
+
+            // save another one
+            test_helpers::save_dummy_delegation(&mut deps.storage, &node_identity, "400");
+
+            let page2 = query_all_network_delegations_paged(
+                deps.as_ref(),
+                Option::from(start_after),
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            // now we have 2 pages, with 2 results on the second page
+            assert_eq!(2, page2.delegations.len());
+        }
+    }
+
+    #[test]
+    fn mix_deletion_query_returns_current_delegation_value() {
+        let mut deps = test_helpers::init_contract();
+        let node_identity: IdentityKey = "foo".into();
+        let delegation_owner = Addr::unchecked("bar");
+
+        let delegation = Delegation::new(
+            delegation_owner.clone(),
+            node_identity.clone(),
+            coin(1234, DENOM),
+            1234,
+            None,
+        );
+
+        storage::delegations()
+            .save(
+                deps.as_mut().storage,
+                delegation.storage_key().joined_key(),
+                &delegation,
+            )
+            .unwrap();
+
+        assert_eq!(
+            Ok(delegation),
+            query_mixnode_delegation(deps.as_ref(), node_identity, delegation_owner.to_string())
+        )
+    }
+
+    #[test]
+    fn mix_deletion_query_returns_error_if_delegation_doesnt_exist() {
+        let mut deps = test_helpers::init_contract();
+
+        let node_identity1: IdentityKey = "foo1".into();
+        let node_identity2: IdentityKey = "foo2".into();
+        let delegation_owner1 = Addr::unchecked("bar");
+        let delegation_owner2 = Addr::unchecked("bar2");
+
+        assert_eq!(
+            Err(ContractError::NoMixnodeDelegationFound {
+                identity: node_identity1.clone(),
+                address: delegation_owner1.clone(),
+            }),
+            query_mixnode_delegation(
+                deps.as_ref(),
+                node_identity1.clone(),
+                delegation_owner1.to_string()
+            )
+        );
+
+        // add delegation from a different address
+        let delegation = Delegation::new(
+            delegation_owner2.clone(),
+            node_identity1.clone(),
+            coin(1234, DENOM),
+            1234,
+            None,
+        );
+
+        storage::delegations()
+            .save(
+                deps.as_mut().storage,
+                delegation.storage_key().joined_key(),
+                &delegation,
+            )
+            .unwrap();
+
+        assert_eq!(
+            Err(ContractError::NoMixnodeDelegationFound {
+                identity: node_identity1.clone(),
+                address: delegation_owner1.clone(),
+            }),
+            query_mixnode_delegation(
+                deps.as_ref(),
+                node_identity1.clone(),
+                delegation_owner1.to_string()
+            )
+        );
+
+        // add delegation for a different node
+        let delegation = Delegation::new(
+            delegation_owner1.clone(),
+            node_identity2.clone(),
+            coin(1234, DENOM),
+            1234,
+            None,
+        );
+
+        storage::delegations()
+            .save(
+                deps.as_mut().storage,
+                delegation.storage_key().joined_key(),
+                &delegation,
+            )
+            .unwrap();
+
+        assert_eq!(
+            Err(ContractError::NoMixnodeDelegationFound {
+                identity: node_identity1.clone(),
+                address: Addr::unchecked(delegation_owner1.clone())
+            }),
+            query_mixnode_delegation(
+                deps.as_ref(),
+                node_identity1.clone(),
+                delegation_owner1.to_string()
+            )
+        )
+    }
+
+    #[cfg(test)]
+    mod querying_for_reverse_mixnode_delegations_paged {
+        use super::*;
+
+        fn store_n_reverse_delegations(n: u32, storage: &mut dyn Storage, delegation_owner: &str) {
+            for i in 0..n {
+                let node_identity = format!("node{}", i);
+                test_helpers::save_dummy_delegation(storage, node_identity, delegation_owner);
+            }
+        }
+
+        #[test]
+        fn retrieval_obeys_limits() {
+            let mut deps = test_helpers::init_contract();
+            let limit = 2;
+            let delegation_owner = "foo".to_string();
+            store_n_reverse_delegations(100, &mut deps.storage, &delegation_owner);
+
+            let page1 = query_delegator_delegations_paged(
+                deps.as_ref(),
+                delegation_owner,
+                None,
+                Option::from(limit),
+            )
+            .unwrap();
+            assert_eq!(limit, page1.delegations.len() as u32);
+        }
+
+        #[test]
+        fn retrieval_has_default_limit() {
+            let mut deps = test_helpers::init_contract();
+            let delegation_owner = "foo".to_string();
+            store_n_reverse_delegations(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+                &mut deps.storage,
+                &delegation_owner,
+            );
+
+            // query without explicitly setting a limit
+            let page1 =
+                query_delegator_delegations_paged(deps.as_ref(), delegation_owner, None, None)
+                    .unwrap();
+            assert_eq!(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT,
+                page1.delegations.len() as u32
+            );
+        }
+
+        #[test]
+        fn retrieval_has_max_limit() {
+            let mut deps = test_helpers::init_contract();
+            let delegation_owner = "foo".to_string();
+            store_n_reverse_delegations(
+                storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+                &mut deps.storage,
+                &delegation_owner,
+            );
+
+            // query with a crazy high limit in an attempt to use too many resources
+            let crazy_limit = 1000 * storage::DELEGATION_PAGE_DEFAULT_LIMIT;
+            let page1 = query_delegator_delegations_paged(
+                deps.as_ref(),
+                delegation_owner,
+                None,
+                Option::from(crazy_limit),
+            )
+            .unwrap();
+
+            // we default to a decent sized upper bound instead
+            let expected_limit = storage::DELEGATION_PAGE_MAX_LIMIT;
+            assert_eq!(expected_limit, page1.delegations.len() as u32);
+        }
+
+        #[test]
+        fn pagination_works() {
+            let mut deps = test_helpers::init_contract();
+            let delegation_owner = "bar".to_string();
+
+            test_helpers::save_dummy_delegation(&mut deps.storage, "100", &delegation_owner);
+
+            let per_page = 2;
+            let page1 = query_delegator_delegations_paged(
+                deps.as_ref(),
+                delegation_owner.clone(),
+                None,
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            // page should have 1 result on it
+            assert_eq!(1, page1.delegations.len());
+
+            // save another
+            test_helpers::save_dummy_delegation(&mut deps.storage, "200", &delegation_owner);
+
+            // page1 should have 2 results on it
+            let page1 = query_delegator_delegations_paged(
+                deps.as_ref(),
+                delegation_owner.clone(),
+                None,
+                Option::from(per_page),
+            )
+            .unwrap();
+            assert_eq!(2, page1.delegations.len());
+
+            test_helpers::save_dummy_delegation(&mut deps.storage, "300", &delegation_owner);
+
+            // page1 still has 2 results
+            let page1 = query_delegator_delegations_paged(
+                deps.as_ref(),
+                delegation_owner.clone(),
+                None,
+                Option::from(per_page),
+            )
+            .unwrap();
+            assert_eq!(2, page1.delegations.len());
+
+            // retrieving the next page should start after the last key on this page
+            let start_after: IdentityKey = page1.start_next_after.unwrap();
+            let page2 = query_delegator_delegations_paged(
+                deps.as_ref(),
+                delegation_owner.clone(),
+                Option::from(start_after),
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            assert_eq!(1, page2.delegations.len());
+
+            // save another one
+            test_helpers::save_dummy_delegation(&mut deps.storage, "400", &delegation_owner);
+
+            let start_after = String::from("2");
+            let page2 = query_delegator_delegations_paged(
+                deps.as_ref(),
+                delegation_owner,
+                Option::from(start_after),
+                Option::from(per_page),
+            )
+            .unwrap();
+
+            // now we have 2 pages, with 2 results on the second page
+            assert_eq!(2, page2.delegations.len());
+        }
+    }
+}
@@ -0,0 +1,180 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use cw_storage_plus::{Index, IndexList, IndexedMap, MultiIndex};
+use mixnet_contract::{Addr, Delegation, IdentityKey};
+
+// storage prefixes
+const DELEGATION_PK_NAMESPACE: &str = "dl";
+const DELEGATION_OWNER_IDX_NAMESPACE: &str = "dlo";
+const DELEGATION_MIXNODE_IDX_NAMESPACE: &str = "dlm";
+
+// paged retrieval limits for all queries and transactions
+pub(crate) const DELEGATION_PAGE_MAX_LIMIT: u32 = 500;
+pub(crate) const DELEGATION_PAGE_DEFAULT_LIMIT: u32 = 250;
+
+// It's a composite key on node's identity and delegator address
+type PrimaryKey = Vec<u8>;
+
+pub(crate) struct DelegationIndex<'a> {
+    pub(crate) owner: MultiIndex<'a, (Addr, PrimaryKey), Delegation>,
+
+    pub(crate) mixnode: MultiIndex<'a, (IdentityKey, PrimaryKey), Delegation>,
+}
+
+impl<'a> IndexList<Delegation> for DelegationIndex<'a> {
+    fn get_indexes(&'_ self) -> Box<dyn Iterator<Item = &'_ dyn Index<Delegation>> + '_> {
+        let v: Vec<&dyn Index<Delegation>> = vec![&self.owner, &self.mixnode];
+        Box::new(v.into_iter())
+    }
+}
+
+// I was really going back and forth about the data stored on the disk vs primary key duplication.
+// It was basically between convenience and bloat, but in the end I decided the convenience wins.
+//
+// Basically I had 2 approaches. a) store delegator address and mixnode identity only as primary key of delegation or
+// b) store it both as primary key AND inside delegation data.
+// For the longest time I was in favour of a), since that removed any data duplication. However...,
+// that also required that during index creation I recovered delegator address and mixnode identity
+// from the Vec<u8>. That doesn't sound that terrible. However, even though I'm 99.99% certain that
+// conversion would be impossible to fail, I'd still have to call an `unwrap` here due to required
+// type signature and I didn't feel super comfortable doing that in our smart contract...
+// So to get rid of this uncertainty I went with the b) approach. Even though each stored delegation
+// takes over ~250B (since the key has to be duplicated), in the grand blockchain scheme of things
+// it's not that terrible. Say we had 100_000_000 delegations -> that's still only 25GB of data
+// and as a nice by-product it cleans up code a little bit by only having a single Delegation type.
+pub(crate) fn delegations<'a>() -> IndexedMap<'a, PrimaryKey, Delegation, DelegationIndex<'a>> {
+    let indexes = DelegationIndex {
+        owner: MultiIndex::new(
+            |d, pk| (d.owner.clone(), pk),
+            DELEGATION_PK_NAMESPACE,
+            DELEGATION_OWNER_IDX_NAMESPACE,
+        ),
+        mixnode: MultiIndex::new(
+            |d, pk| (d.node_identity.clone(), pk),
+            DELEGATION_PK_NAMESPACE,
+            DELEGATION_MIXNODE_IDX_NAMESPACE,
+        ),
+    };
+
+    IndexedMap::new(DELEGATION_PK_NAMESPACE, indexes)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::delegations::storage;
+    use cosmwasm_std::Addr;
+    use mixnet_contract::IdentityKey;
+
+    #[cfg(test)]
+    mod reverse_mix_delegations {
+        use super::*;
+        use crate::support::tests::test_helpers;
+        use config::defaults::DENOM;
+        use cosmwasm_std::testing::mock_env;
+        use cosmwasm_std::{coin, Order};
+        use cw_storage_plus::PrimaryKey;
+        use mixnet_contract::Delegation;
+
+        #[test]
+        fn reverse_mix_delegation_exists() {
+            let mut deps = test_helpers::init_contract();
+            let node_identity: IdentityKey = "foo".into();
+            let delegation_owner = Addr::unchecked("bar");
+            let delegation = coin(12345, DENOM);
+
+            let dummy_data = Delegation::new(
+                delegation_owner.clone(),
+                node_identity.clone(),
+                delegation,
+                mock_env().block.height,
+                None,
+            );
+
+            storage::delegations()
+                .save(
+                    &mut deps.storage,
+                    (node_identity.clone(), delegation_owner.clone()).joined_key(),
+                    &dummy_data,
+                )
+                .unwrap();
+
+            let read = storage::delegations()
+                .idx
+                .owner
+                .prefix(delegation_owner)
+                .range(&deps.storage, None, None, Order::Ascending)
+                .map(|record| record.unwrap().1)
+                .collect::<Vec<_>>();
+
+            assert_eq!(1, read.len());
+            assert_eq!(dummy_data, read[0]);
+        }
+
+        #[test]
+        fn reverse_mix_delegation_returns_none_if_delegation_doesnt_exist() {
+            let mut deps = test_helpers::init_contract();
+
+            let node_identity1: IdentityKey = "foo1".into();
+            let node_identity2: IdentityKey = "foo2".into();
+            let delegation_owner1 = Addr::unchecked("bar");
+            let delegation_owner2 = Addr::unchecked("bar2");
+            let delegation = coin(12345, DENOM);
+
+            assert!(test_helpers::read_delegation(
+                deps.as_ref().storage,
+                &node_identity1,
+                &delegation_owner1
+            )
+            .is_none());
+
+            // add delegation for a different node
+            let dummy_data = Delegation::new(
+                delegation_owner1.clone(),
+                node_identity2.clone(),
+                delegation.clone(),
+                mock_env().block.height,
+                None,
+            );
+            storage::delegations()
+                .save(
+                    &mut deps.storage,
+                    (node_identity1.clone(), delegation_owner1.clone()).joined_key(),
+                    &dummy_data,
+                )
+                .unwrap();
+
+            storage::delegations()
+                .idx
+                .owner
+                .prefix(delegation_owner1.clone())
+                .range(&deps.storage, None, None, Order::Ascending)
+                .map(|record| record.unwrap().1)
+                .for_each(|delegation| assert_ne!(delegation.node_identity, node_identity1));
+
+            // add delegation from a different owner
+            let dummy_data = Delegation::new(
+                delegation_owner2.clone(),
+                node_identity1.clone(),
+                delegation.clone(),
+                mock_env().block.height,
+                None,
+            );
+            storage::delegations()
+                .save(
+                    &mut deps.storage,
+                    (node_identity1.clone(), delegation_owner2.clone()).joined_key(),
+                    &dummy_data,
+                )
+                .unwrap();
+
+            storage::delegations()
+                .idx
+                .owner
+                .prefix(delegation_owner1.clone())
+                .range(&deps.storage, None, None, Order::Ascending)
+                .map(|record| record.unwrap().1)
+                .for_each(|delegation| assert_ne!(delegation.node_identity, node_identity1));
+        }
+    }
+}
@@ -0,0 +1,862 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+use super::storage;
+use crate::error::ContractError;
+use crate::mixnodes::storage as mixnodes_storage;
+use crate::support::helpers::generate_storage_key;
+use config::defaults::DENOM;
+use cosmwasm_std::{coins, wasm_execute, Addr, BankMsg, Coin, DepsMut, Env, MessageInfo, Response};
+use cw_storage_plus::PrimaryKey;
+use mixnet_contract::Delegation;
+use mixnet_contract::IdentityKey;
+use vesting_contract::messages::ExecuteMsg as VestingContractExecuteMsg;
+
+fn validate_delegation_stake(mut delegation: Vec<Coin>) -> Result<Coin, ContractError> {
+    // check if anything was put as delegation
+    if delegation.is_empty() {
+        return Err(ContractError::EmptyDelegation);
+    }
+
+    if delegation.len() > 1 {
+        return Err(ContractError::MultipleDenoms);
+    }
+
+    // check that the denomination is correct
+    if delegation[0].denom != DENOM {
+        return Err(ContractError::WrongDenom {});
+    }
+
+    // check that we have provided a non-zero amount in the delegation
+    if delegation[0].amount.is_zero() {
+        return Err(ContractError::EmptyDelegation);
+    }
+
+    Ok(delegation.pop().unwrap())
+}
+
+pub(crate) fn try_delegate_to_mixnode(
+    deps: DepsMut,
+    env: Env,
+    info: MessageInfo,
+    mix_identity: IdentityKey,
+) -> Result<Response, ContractError> {
+    // check if the delegation contains any funds of the appropriate denomination
+    let amount = validate_delegation_stake(info.funds)?;
+
+    _try_delegate_to_mixnode(deps, env, mix_identity, info.sender.as_str(), amount, None)
+}
+
+pub(crate) fn try_delegate_to_mixnode_on_behalf(
+    deps: DepsMut,
+    env: Env,
+    info: MessageInfo,
+    mix_identity: IdentityKey,
+    delegate: String,
+) -> Result<Response, ContractError> {
+    // check if the delegation contains any funds of the appropriate denomination
+    let amount = validate_delegation_stake(info.funds)?;
+
+    _try_delegate_to_mixnode(
+        deps,
+        env,
+        mix_identity,
+        &delegate,
+        amount,
+        Some(info.sender),
+    )
+}
+
+pub(crate) fn _try_delegate_to_mixnode(
+    deps: DepsMut,
+    env: Env,
+    mix_identity: IdentityKey,
+    delegate: &str,
+    amount: Coin,
+    proxy: Option<Addr>,
+) -> Result<Response, ContractError> {
+    let delegate = deps.api.addr_validate(delegate)?;
+
+    // check if the target node actually exists
+    if mixnodes_storage::mixnodes()
+        .may_load(deps.storage, &mix_identity)?
+        .is_none()
+    {
+        return Err(ContractError::MixNodeBondNotFound {
+            identity: mix_identity,
+        });
+    }
+
+    let maybe_proxy_storage = generate_storage_key(&delegate, proxy.as_ref());
+    let storage_key = (mix_identity.clone(), maybe_proxy_storage).joined_key();
+
+    // update total_delegation of this node
+    mixnodes_storage::TOTAL_DELEGATION.update::<_, ContractError>(
+        deps.storage,
+        &mix_identity,
+        |total_delegation| {
+            // since we know that the target node exists and because the total_delegation bucket
+            // entry is created whenever the node itself is added, the unwrap here is fine
+            // as the entry MUST exist
+            Ok(total_delegation.unwrap() + amount.amount)
+        },
+    )?;
+
+    // update [or create new] delegation of this delegator
+    storage::delegations().update::<_, ContractError>(
+        deps.storage,
+        storage_key,
+        |existing_delegation| {
+            Ok(match existing_delegation {
+                Some(mut existing_delegation) => {
+                    existing_delegation.increment_amount(amount.amount, Some(env.block.height));
+                    existing_delegation
+                }
+                None => Delegation::new(
+                    delegate.to_owned(),
+                    mix_identity,
+                    amount,
+                    env.block.height,
+                    proxy,
+                ),
+            })
+        },
+    )?;
+
+    Ok(Response::default())
+}
+
+pub(crate) fn try_remove_delegation_from_mixnode(
+    deps: DepsMut,
+    info: MessageInfo,
+    mix_identity: IdentityKey,
+) -> Result<Response, ContractError> {
+    _try_remove_delegation_from_mixnode(deps, mix_identity, info.sender.as_str(), None)
+}
+
+pub(crate) fn try_remove_delegation_from_mixnode_on_behalf(
+    deps: DepsMut,
+    info: MessageInfo,
+    mix_identity: IdentityKey,
+    delegate: String,
+) -> Result<Response, ContractError> {
+    _try_remove_delegation_from_mixnode(deps, mix_identity, &delegate, Some(info.sender))
+}
+
+pub(crate) fn _try_remove_delegation_from_mixnode(
+    deps: DepsMut,
+    mix_identity: IdentityKey,
+    delegate: &str,
+    proxy: Option<Addr>,
+) -> Result<Response, ContractError> {
+    let delegate = deps.api.addr_validate(delegate)?;
+    let delegation_map = storage::delegations();
+    let maybe_proxy_storage = generate_storage_key(&delegate, proxy.as_ref());
+    let storage_key = (mix_identity.clone(), maybe_proxy_storage).joined_key();
+
+    match delegation_map.may_load(deps.storage, storage_key.clone())? {
+        None => Err(ContractError::NoMixnodeDelegationFound {
+            identity: mix_identity,
+            address: delegate,
+        }),
+        Some(old_delegation) => {
+            // remove all delegation associated with this delegator
+            if proxy != old_delegation.proxy {
+                return Err(ContractError::ProxyMismatch {
+                    existing: old_delegation
+                        .proxy
+                        .map_or_else(|| "None".to_string(), |a| a.to_string()),
+                    incoming: proxy.map_or_else(|| "None".to_string(), |a| a.to_string()),
+                });
+            }
+            // remove old delegation data from the store
+            // note for reviewers: I'm using `replace` as `remove` is just `may_load` followed by `replace`
+            // and we've already performed `may_load` and have access to pre-existing data
+            delegation_map.replace(deps.storage, storage_key, None, Some(&old_delegation))?;
+
+            // send delegated funds back to the delegation owner
+            let return_tokens = BankMsg::Send {
+                to_address: proxy.as_ref().unwrap_or(&delegate).to_string(),
+                amount: coins(
+                    old_delegation.amount.amount.u128(),
+                    old_delegation.amount.denom.clone(),
+                ),
+            };
+
+            // update total_delegation of this node
+            mixnodes_storage::TOTAL_DELEGATION.update::<_, ContractError>(
+                deps.storage,
+                &mix_identity,
+                |total_delegation| {
+                    // the first unwrap is fine because the delegation information MUST exist, otherwise we would
+                    // have never gotten here in the first place
+                    // the second unwrap is also fine because we should NEVER underflow here,
+                    // if we do, it means we have some serious error in our logic
+                    Ok(total_delegation
+                        .unwrap()
+                        .checked_sub(old_delegation.amount.amount)
+                        .unwrap())
+                },
+            )?;
+
+            let mut response = Response::new().add_message(return_tokens);
+
+            if let Some(proxy) = &proxy {
+                let msg = Some(VestingContractExecuteMsg::TrackUndelegation {
+                    owner: delegate.as_str().to_string(),
+                    mix_identity: mix_identity.clone(),
+                    amount: old_delegation.amount,
+                });
+
+                let track_undelegation_msg = wasm_execute(proxy, &msg, coins(0, DENOM))?;
+
+                response = response.add_message(track_undelegation_msg);
+            }
+            Ok(response)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use cosmwasm_std::coins;
+
+    use crate::support::tests::test_helpers;
+
+    use super::storage;
+    use super::*;
+
+    #[cfg(test)]
+    mod delegation_stake_validation {
+        use cosmwasm_std::coin;
+
+        use super::*;
+
+        #[test]
+        fn stake_cant_be_empty() {
+            assert_eq!(
+                Err(ContractError::EmptyDelegation),
+                validate_delegation_stake(vec![])
+            )
+        }
+
+        #[test]
+        fn stake_must_have_single_coin_type() {
+            assert_eq!(
+                Err(ContractError::MultipleDenoms),
+                validate_delegation_stake(vec![
+                    coin(123, DENOM),
+                    coin(123, "BTC"),
+                    coin(123, "DOGE")
+                ])
+            )
+        }
+
+        #[test]
+        fn stake_coin_must_be_of_correct_type() {
+            assert_eq!(
+                Err(ContractError::WrongDenom {}),
+                validate_delegation_stake(coins(123, "DOGE"))
+            )
+        }
+
+        #[test]
+        fn stake_coin_must_have_value_greater_than_zero() {
+            assert_eq!(
+                Err(ContractError::EmptyDelegation),
+                validate_delegation_stake(coins(0, DENOM))
+            )
+        }
+
+        #[test]
+        fn stake_can_have_any_positive_value() {
+            // this might change in the future, but right now an arbitrary (positive) value can be delegated
+            assert!(validate_delegation_stake(coins(1, DENOM)).is_ok());
+            assert!(validate_delegation_stake(coins(123, DENOM)).is_ok());
+            assert!(validate_delegation_stake(coins(10000000000, DENOM)).is_ok());
+        }
+    }
+
+    #[cfg(test)]
+    mod mix_stake_delegation {
+        use super::*;
+        use crate::mixnodes::transactions::try_remove_mixnode;
+        use crate::support::tests::test_helpers::good_mixnode_bond;
+        use cosmwasm_std::coin;
+        use cosmwasm_std::testing::mock_env;
+        use cosmwasm_std::testing::mock_info;
+        use cosmwasm_std::Addr;
+
+        #[test]
+        fn fails_if_node_doesnt_exist() {
+            let mut deps = test_helpers::init_contract();
+            assert_eq!(
+                Err(ContractError::MixNodeBondNotFound {
+                    identity: "non-existent-mix-identity".into()
+                }),
+                try_delegate_to_mixnode(
+                    deps.as_mut(),
+                    mock_env(),
+                    mock_info("sender", &coins(123, DENOM)),
+                    "non-existent-mix-identity".into(),
+                )
+            );
+        }
+
+        #[test]
+        fn succeeds_for_existing_node() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            let delegation = coin(123, DENOM);
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &[delegation.clone()]),
+                identity.clone(),
+            )
+            .is_ok());
+
+            let expected = Delegation::new(
+                delegation_owner.clone(),
+                identity.clone(),
+                delegation.clone(),
+                mock_env().block.height,
+                None,
+            );
+
+            assert_eq!(
+                expected,
+                test_helpers::read_delegation(&deps.storage, &identity, delegation_owner).unwrap()
+            );
+
+            // node's "total_delegation" is increased
+            assert_eq!(
+                delegation.amount,
+                mixnodes_storage::TOTAL_DELEGATION
+                    .load(&deps.storage, &identity)
+                    .unwrap()
+            )
+        }
+
+        #[test]
+        fn fails_if_node_unbonded() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            try_remove_mixnode(deps.as_mut(), mock_info(mixnode_owner, &[])).unwrap();
+            assert_eq!(
+                Err(ContractError::MixNodeBondNotFound {
+                    identity: identity.clone()
+                }),
+                try_delegate_to_mixnode(
+                    deps.as_mut(),
+                    mock_env(),
+                    mock_info(delegation_owner.as_str(), &coins(123, DENOM)),
+                    identity,
+                )
+            );
+        }
+
+        #[test]
+        fn succeeds_if_node_rebonded() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            try_remove_mixnode(deps.as_mut(), mock_info(mixnode_owner, &[])).unwrap();
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation = coin(123, DENOM);
+            let delegation_owner = Addr::unchecked("sender");
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &[delegation.clone()]),
+                identity.clone(),
+            )
+            .is_ok());
+
+            let expected = Delegation::new(
+                delegation_owner.clone(),
+                identity.clone(),
+                delegation.clone(),
+                mock_env().block.height,
+                None,
+            );
+
+            assert_eq!(
+                expected,
+                test_helpers::read_delegation(&deps.storage, &identity, delegation_owner).unwrap()
+            );
+
+            // node's "total_delegation" is increased
+            assert_eq!(
+                delegation.amount,
+                mixnodes_storage::TOTAL_DELEGATION
+                    .load(&deps.storage, &identity)
+                    .unwrap()
+            )
+        }
+
+        #[test]
+        fn is_possible_for_an_already_delegated_node() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            let delegation1 = coin(100, DENOM);
+            let delegation2 = coin(50, DENOM);
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &[delegation1.clone()]),
+                identity.clone(),
+            )
+            .unwrap();
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &[delegation2.clone()]),
+                identity.clone(),
+            )
+            .unwrap();
+
+            let expected = Delegation::new(
+                delegation_owner.clone(),
+                identity.clone(),
+                coin(delegation1.amount.u128() + delegation2.amount.u128(), DENOM),
+                mock_env().block.height,
+                None,
+            );
+
+            assert_eq!(
+                expected,
+                test_helpers::read_delegation(&deps.storage, &identity, delegation_owner).unwrap()
+            );
+
+            // node's "total_delegation" is sum of both
+            assert_eq!(
+                delegation1.amount + delegation2.amount,
+                mixnodes_storage::TOTAL_DELEGATION
+                    .load(&deps.storage, &identity)
+                    .unwrap()
+            )
+        }
+
+        #[test]
+        fn block_height_is_updated_on_new_delegation() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            let delegation = coin(100, DENOM);
+            let env1 = mock_env();
+            let mut env2 = mock_env();
+            let initial_height = env1.block.height;
+            let updated_height = initial_height + 42;
+            // second env has grown in block height
+            env2.block.height = updated_height;
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                env1,
+                mock_info(delegation_owner.as_str(), &[delegation.clone()]),
+                identity.clone(),
+            )
+            .unwrap();
+            assert_eq!(
+                initial_height,
+                test_helpers::read_delegation(&deps.storage, &identity, &delegation_owner)
+                    .unwrap()
+                    .block_height
+            );
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                env2,
+                mock_info(delegation_owner.as_str(), &[delegation.clone()]),
+                identity.clone(),
+            )
+            .unwrap();
+
+            let updated =
+                test_helpers::read_delegation(&deps.storage, &identity, &delegation_owner).unwrap();
+
+            assert_eq!(delegation.amount + delegation.amount, updated.amount.amount);
+            assert_eq!(updated_height, updated.block_height);
+        }
+
+        #[test]
+        fn block_height_is_not_updated_on_different_delegator() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner1 = Addr::unchecked("sender1");
+            let delegation_owner2 = Addr::unchecked("sender2");
+            let delegation1 = coin(100, DENOM);
+            let delegation2 = coin(120, DENOM);
+            let env1 = mock_env();
+            let mut env2 = mock_env();
+            let initial_height = env1.block.height;
+            let second_height = initial_height + 42;
+            // second env has grown in block height
+            env2.block.height = second_height;
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                env1,
+                mock_info(delegation_owner1.as_str(), &[delegation1.clone()]),
+                identity.clone(),
+            )
+            .unwrap();
+
+            assert_eq!(
+                initial_height,
+                test_helpers::read_delegation(&deps.storage, &identity, &delegation_owner1)
+                    .unwrap()
+                    .block_height
+            );
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                env2,
+                mock_info(delegation_owner2.as_str(), &[delegation2.clone()]),
+                identity.clone(),
+            )
+            .unwrap();
+
+            assert_eq!(
+                initial_height,
+                test_helpers::read_delegation(&deps.storage, &identity, &delegation_owner1)
+                    .unwrap()
+                    .block_height
+            );
+            assert_eq!(
+                second_height,
+                test_helpers::read_delegation(&deps.storage, identity, &delegation_owner2)
+                    .unwrap()
+                    .block_height
+            );
+        }
+
+        #[test]
+        fn is_disallowed_for_already_delegated_node_if_it_unbonded() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &coins(100, DENOM)),
+                identity.clone(),
+            )
+            .unwrap();
+            try_remove_mixnode(deps.as_mut(), mock_info(mixnode_owner, &[])).unwrap();
+            assert_eq!(
+                Err(ContractError::MixNodeBondNotFound {
+                    identity: identity.clone()
+                }),
+                try_delegate_to_mixnode(
+                    deps.as_mut(),
+                    mock_env(),
+                    mock_info(delegation_owner.as_str(), &coins(50, DENOM)),
+                    identity,
+                )
+            );
+        }
+
+        #[test]
+        fn is_allowed_for_multiple_nodes() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner1 = "bob";
+            let mixnode_owner2 = "fred";
+            let identity1 =
+                test_helpers::add_mixnode(mixnode_owner1, good_mixnode_bond(), deps.as_mut());
+            let identity2 =
+                test_helpers::add_mixnode(mixnode_owner2, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &coins(123, DENOM)),
+                identity1.clone(),
+            )
+            .is_ok());
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &coins(42, DENOM)),
+                identity2.clone(),
+            )
+            .is_ok());
+
+            let expected1 = Delegation::new(
+                delegation_owner.clone(),
+                identity1.clone(),
+                coin(123, DENOM),
+                mock_env().block.height,
+                None,
+            );
+
+            let expected2 = Delegation::new(
+                delegation_owner.clone(),
+                identity2.clone(),
+                coin(42, DENOM),
+                mock_env().block.height,
+                None,
+            );
+
+            assert_eq!(
+                expected1,
+                test_helpers::read_delegation(&deps.storage, identity1, &delegation_owner).unwrap()
+            );
+            assert_eq!(
+                expected2,
+                test_helpers::read_delegation(&deps.storage, identity2, &delegation_owner).unwrap()
+            );
+        }
+
+        #[test]
+        fn is_allowed_by_multiple_users() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation1 = coin(123, DENOM);
+            let delegation2 = coin(234, DENOM);
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info("sender1", &[delegation1.clone()]),
+                identity.clone(),
+            )
+            .is_ok());
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info("sender2", &[delegation2.clone()]),
+                identity.clone(),
+            )
+            .is_ok());
+            // node's "total_delegation" is sum of both
+            assert_eq!(
+                delegation1.amount + delegation2.amount,
+                mixnodes_storage::TOTAL_DELEGATION
+                    .load(&deps.storage, &identity)
+                    .unwrap()
+            )
+        }
+
+        #[test]
+        fn delegation_is_not_removed_if_node_unbonded() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            let delegation_amount = coin(100, DENOM);
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &vec![delegation_amount.clone()]),
+                identity.clone(),
+            )
+            .unwrap();
+            try_remove_mixnode(deps.as_mut(), mock_info(mixnode_owner, &[])).unwrap();
+
+            let expected = Delegation::new(
+                delegation_owner.clone(),
+                identity.clone(),
+                delegation_amount,
+                mock_env().block.height,
+                None,
+            );
+
+            assert_eq!(
+                expected,
+                test_helpers::read_delegation(&deps.storage, identity, delegation_owner).unwrap()
+            )
+        }
+    }
+
+    #[cfg(test)]
+    mod removing_mix_stake_delegation {
+        use cosmwasm_std::coin;
+        use cosmwasm_std::testing::mock_env;
+        use cosmwasm_std::testing::mock_info;
+        use cosmwasm_std::Addr;
+        use cosmwasm_std::Uint128;
+
+        use crate::mixnodes::transactions::try_remove_mixnode;
+        use crate::support::tests::test_helpers::good_mixnode_bond;
+
+        use super::storage;
+        use super::*;
+
+        #[test]
+        fn fails_if_delegation_never_existed() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            assert_eq!(
+                Err(ContractError::NoMixnodeDelegationFound {
+                    identity: identity.clone(),
+                    address: delegation_owner.clone(),
+                }),
+                try_remove_delegation_from_mixnode(
+                    deps.as_mut(),
+                    mock_info(delegation_owner.as_str(), &[]),
+                    identity,
+                )
+            );
+        }
+
+        #[test]
+        fn succeeds_if_delegation_existed() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &coins(100, DENOM)),
+                identity.clone(),
+            )
+            .unwrap();
+            assert_eq!(
+                Ok(Response::new().add_message(BankMsg::Send {
+                    to_address: delegation_owner.clone().into(),
+                    amount: coins(100, DENOM),
+                })),
+                try_remove_delegation_from_mixnode(
+                    deps.as_mut(),
+                    mock_info(delegation_owner.as_str(), &[]),
+                    identity.clone(),
+                )
+            );
+            assert!(storage::delegations()
+                .may_load(
+                    &deps.storage,
+                    (identity.clone(), delegation_owner).joined_key(),
+                )
+                .unwrap()
+                .is_none());
+
+            // and total delegation is cleared
+            assert_eq!(
+                Uint128::zero(),
+                mixnodes_storage::TOTAL_DELEGATION
+                    .load(&deps.storage, &identity)
+                    .unwrap()
+            )
+        }
+
+        #[test]
+        fn succeeds_if_delegation_existed_even_if_node_unbonded() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner = Addr::unchecked("sender");
+            try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner.as_str(), &coins(100, DENOM)),
+                identity.clone(),
+            )
+            .unwrap();
+            try_remove_mixnode(deps.as_mut(), mock_info(mixnode_owner, &[])).unwrap();
+            assert_eq!(
+                Ok(Response::new().add_message(BankMsg::Send {
+                    to_address: delegation_owner.clone().into(),
+                    amount: coins(100, DENOM),
+                })),
+                try_remove_delegation_from_mixnode(
+                    deps.as_mut(),
+                    mock_info(delegation_owner.as_str(), &[]),
+                    identity.clone(),
+                )
+            );
+
+            assert!(
+                test_helpers::read_delegation(&deps.storage, identity, delegation_owner).is_none()
+            );
+        }
+
+        #[test]
+        fn total_delegation_is_preserved_if_only_some_undelegate() {
+            let mut deps = test_helpers::init_contract();
+            let mixnode_owner = "bob";
+            let identity =
+                test_helpers::add_mixnode(mixnode_owner, good_mixnode_bond(), deps.as_mut());
+            let delegation_owner1 = Addr::unchecked("sender1");
+            let delegation_owner2 = Addr::unchecked("sender2");
+            let delegation1 = coin(123, DENOM);
+            let delegation2 = coin(234, DENOM);
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner1.as_str(), &[delegation1.clone()]),
+                identity.clone(),
+            )
+            .is_ok());
+            assert!(try_delegate_to_mixnode(
+                deps.as_mut(),
+                mock_env(),
+                mock_info(delegation_owner2.as_str(), &[delegation2.clone()]),
+                identity.clone(),
+            )
+            .is_ok());
+            // sender1 undelegates
+            try_remove_delegation_from_mixnode(
+                deps.as_mut(),
+                mock_info(delegation_owner1.as_str(), &[]),
+                identity.clone(),
+            )
+            .unwrap();
+            // but total delegation should still equal to what sender2 sent
+            // node's "total_delegation" is sum of both
+            assert_eq!(
+                delegation2.amount,
+                mixnodes_storage::TOTAL_DELEGATION
+                    .load(&deps.storage, &identity)
+                    .unwrap()
+            )
+        }
+    }
+
+    // #[cfg(test)]
+    // mod multi_delegations {
+    //     use super::*;
+    //     use crate::delegations::helpers;
+    //     use crate::delegations::queries::tests::store_n_mix_delegations;
+    //     use crate::support::tests::test_helpers;
+    //     use mixnet_contract::IdentityKey;
+    //     use mixnet_contract::RawDelegationData;
+    //
+    //     #[test]
+    //     fn multiple_page_delegations() {
+    //         let mut deps = test_helpers::init_contract();
+    //         let node_identity: IdentityKey = "foo".into();
+    //         store_n_mix_delegations(
+    //             storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+    //             &mut deps.storage,
+    //             &node_identity,
+    //         );
+    //         let mix_bucket = storage::all_mix_delegations_read::<RawDelegationData>(&deps.storage);
+    //         let mix_delegations = helpers::Delegations::new(mix_bucket);
+    //         assert_eq!(
+    //             storage::DELEGATION_PAGE_DEFAULT_LIMIT * 10,
+    //             mix_delegations.count() as u32
+    //         );
+    //     }
+    // }
+}
@@ -24,9 +24,6 @@ pub enum ContractError {
    #[error("Not enough funds sent for gateway bond. (received {received}, minimum {minimum})")]
    InsufficientGatewayBond { received: u128, minimum: u128 },

-    #[error("Gateway ({identity}) does not exist")]
-    GatewayBondNotFound { identity: IdentityKey },
-
    #[error("{owner} does not seem to own any mixnodes")]
    NoAssociatedMixNodeBond { owner: Addr },

@@ -45,17 +42,14 @@ pub enum ContractError {
    #[error("No coin was sent for the bonding, you must send {}", DENOM)]
    NoBondFound,

-    #[error("The bond reward rate for mixnode was set to be lower than 1")]
-    DecreasingMixnodeBondReward,
-
-    #[error("The delegation reward rate for mixnode was set to be lower than 1")]
-    DecreasingMixnodeDelegationReward,
-
    #[error("Provided active set size is bigger than the demanded set")]
    InvalidActiveSetSize,

-    #[error("The node had uptime larger than 100%")]
-    UnexpectedUptime,
+    #[error("Provided active set size is zero")]
+    ZeroActiveSet,
+
+    #[error("Provided rewarded set size is zero")]
+    ZeroRewardedSet,

    #[error("This address has already bonded a mixnode")]
    AlreadyOwnsMixnode,
@@ -72,23 +66,15 @@ pub enum ContractError {
    #[error("No funds were provided for the delegation")]
    EmptyDelegation,

-    #[error("Request did not come from the node owner ({owner})")]
-    InvalidSender { owner: Addr },
-
    #[error("Could not find any delegation information associated with mixnode {identity} for {address}")]
    NoMixnodeDelegationFound {
        identity: IdentityKey,
        address: Addr,
    },
-    #[error("Overflow error!")]
-    Overflow(#[from] cosmwasm_std::OverflowError),

    #[error("We tried to remove more funds then are available in the Reward pool. Wanted to remove {to_remove}, but have only {reward_pool}")]
    OutOfFunds { to_remove: u128, reward_pool: u128 },

-    #[error("Invalid ratio")]
-    Ratio(#[from] mixnet_contract::error::MixnetContractError),
-
    #[error("Received invalid rewarding interval nonce. Expected {expected}, received {received}")]
    InvalidRewardingIntervalNonce { received: u32, expected: u32 },

@@ -100,4 +86,25 @@ pub enum ContractError {

    #[error("Mixnode {identity} has already been rewarded during the current rewarding interval")]
    MixnodeAlreadyRewarded { identity: IdentityKey },
+
+    #[error("Some of mixnodes {identity} delegators are still pending reward")]
+    DelegatorsPendingReward { identity: IdentityKey },
+
+    #[error("Mixnode's {identity} operator has not been rewarded yet - cannot perform delegator rewarding until that happens")]
+    MixnodeOperatorNotRewarded { identity: IdentityKey },
+
+    #[error("Proxy address mismatch, expected {existing}, got {incoming}")]
+    ProxyMismatch { existing: String, incoming: String },
+
+    #[error("Failed to recover ed25519 public key from its base58 representation - {0}")]
+    MalformedEd25519IdentityKey(String),
+
+    #[error("Failed to recover ed25519 signature from its base58 representation - {0}")]
+    MalformedEd25519Signature(String),
+
+    #[error("Provided ed25519 signature did not verify correctly")]
+    InvalidEd25519Signature,
+
+    #[error("Profit margin percent needs to be an integer in range [0, 100], recieved {0}")]
+    InvalidProfitMarginPercent(u8),
 }
@@ -0,0 +1,6 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub mod queries;
+pub mod storage;
+pub mod transactions;
@@ -0,0 +1,212 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use super::storage;
+use crate::mixnodes::storage::{BOND_PAGE_DEFAULT_LIMIT, BOND_PAGE_MAX_LIMIT}; // Keeps gateway and mixnode retrieval in sync by re-using the constant. Could be split into its own constant.
+use cosmwasm_std::{Deps, Order, StdResult};
+use cw_storage_plus::Bound;
+use mixnet_contract::{GatewayBond, GatewayOwnershipResponse, IdentityKey, PagedGatewayResponse};
+
+pub(crate) fn query_gateways_paged(
+    deps: Deps,
+    start_after: Option<IdentityKey>,
+    limit: Option<u32>,
+) -> StdResult<PagedGatewayResponse> {
+    let limit = limit
+        .unwrap_or(BOND_PAGE_DEFAULT_LIMIT)
+        .min(BOND_PAGE_MAX_LIMIT) as usize;
+    let start = start_after.map(Bound::exclusive);
+
+    let nodes = storage::gateways()
+        .range(deps.storage, start, None, Order::Ascending)
+        .take(limit)
+        .map(|res| res.map(|item| item.1))
+        .collect::<StdResult<Vec<GatewayBond>>>()?;
+
+    let start_next_after = nodes.last().map(|node| node.identity().clone());
+
+    Ok(PagedGatewayResponse::new(nodes, limit, start_next_after))
+}
+
+pub(crate) fn query_owns_gateway(
+    deps: Deps,
+    address: String,
+) -> StdResult<GatewayOwnershipResponse> {
+    let validated_addr = deps.api.addr_validate(&address)?;
+
+    let gateway = storage::gateways()
+        .idx
+        .owner
+        .item(deps.storage, validated_addr.clone())?
+        .map(|record| record.1);
+
+    Ok(GatewayOwnershipResponse {
+        address: validated_addr,
+        gateway,
+    })
+}
+
+#[cfg(test)]
+pub(crate) mod tests {
+    use super::*;
+    use crate::contract::execute;
+    use crate::support::tests::test_helpers;
+    use cosmwasm_std::testing::{mock_env, mock_info};
+
+    #[test]
+    fn gateways_empty_on_init() {
+        let deps = test_helpers::init_contract();
+        let response = query_gateways_paged(deps.as_ref(), None, Option::from(2)).unwrap();
+        assert_eq!(0, response.nodes.len());
+    }
+
+    #[test]
+    fn gateways_paged_retrieval_obeys_limits() {
+        let mut deps = test_helpers::init_contract();
+        let limit = 2;
+        for n in 0..1000 {
+            let key = format!("bond{}", n);
+            test_helpers::add_gateway(&key, test_helpers::good_gateway_bond(), deps.as_mut());
+        }
+
+        let page1 = query_gateways_paged(deps.as_ref(), None, Option::from(limit)).unwrap();
+        assert_eq!(limit, page1.nodes.len() as u32);
+    }
+
+    #[test]
+    fn gateways_paged_retrieval_has_default_limit() {
+        let mut deps = test_helpers::init_contract();
+        for n in 0..1000 {
+            let key = format!("bond{}", n);
+            test_helpers::add_gateway(&key, test_helpers::good_gateway_bond(), deps.as_mut());
+        }
+
+        // query without explicitly setting a limit
+        let page1 = query_gateways_paged(deps.as_ref(), None, None).unwrap();
+
+        assert_eq!(BOND_PAGE_DEFAULT_LIMIT, page1.nodes.len() as u32);
+    }
+
+    #[test]
+    fn gateways_paged_retrieval_has_max_limit() {
+        let mut deps = test_helpers::init_contract();
+        for n in 0..1000 {
+            let key = format!("bond{}", n);
+            test_helpers::add_gateway(&key, test_helpers::good_gateway_bond(), deps.as_mut());
+        }
+
+        // query with a crazily high limit in an attempt to use too many resources
+        let crazy_limit = 1000 * BOND_PAGE_DEFAULT_LIMIT;
+        let page1 = query_gateways_paged(deps.as_ref(), None, Option::from(crazy_limit)).unwrap();
+
+        // we default to a decent sized upper bound instead
+        let expected_limit = BOND_PAGE_MAX_LIMIT;
+        assert_eq!(expected_limit, page1.nodes.len() as u32);
+    }
+
+    #[test]
+    fn gateway_pagination_works() {
+        // prepare 4 messages and identities that are sorted by the generated identities
+        // (because we query them in an ascended manner)
+        let mut exec_data = (0..4)
+            .map(|i| {
+                let sender = format!("nym-addr{}", i);
+                let (msg, identity) = test_helpers::valid_bond_gateway_msg(&sender);
+                (msg, (sender, identity))
+            })
+            .collect::<Vec<_>>();
+        exec_data.sort_by(|(_, (_, id1)), (_, (_, id2))| id1.cmp(id2));
+        let (messages, sender_identities): (Vec<_>, Vec<_>) = exec_data.into_iter().unzip();
+
+        let mut deps = test_helpers::init_contract();
+
+        let info = mock_info(
+            &sender_identities[0].0.clone(),
+            &test_helpers::good_gateway_bond(),
+        );
+        execute(deps.as_mut(), mock_env(), info, messages[0].clone()).unwrap();
+
+        let per_page = 2;
+        let page1 = query_gateways_paged(deps.as_ref(), None, Option::from(per_page)).unwrap();
+
+        // page should have 1 result on it
+        assert_eq!(1, page1.nodes.len());
+
+        // save another
+        let info = mock_info(
+            &sender_identities[1].0.clone(),
+            &test_helpers::good_gateway_bond(),
+        );
+        execute(deps.as_mut(), mock_env(), info, messages[1].clone()).unwrap();
+
+        // page1 should have 2 results on it
+        let page1 = query_gateways_paged(deps.as_ref(), None, Option::from(per_page)).unwrap();
+        assert_eq!(2, page1.nodes.len());
+
+        let info = mock_info(
+            &sender_identities[2].0.clone(),
+            &test_helpers::good_gateway_bond(),
+        );
+        execute(deps.as_mut(), mock_env(), info, messages[2].clone()).unwrap();
+
+        // page1 still has 2 results
+        let page1 = query_gateways_paged(deps.as_ref(), None, Option::from(per_page)).unwrap();
+        assert_eq!(2, page1.nodes.len());
+
+        // retrieving the next page should start after the last key on this page
+        let start_after = page1.start_next_after.unwrap();
+        let page2 = query_gateways_paged(
+            deps.as_ref(),
+            Option::from(start_after.clone()),
+            Option::from(per_page),
+        )
+        .unwrap();
+
+        assert_eq!(1, page2.nodes.len());
+
+        // save another one
+        let info = mock_info(
+            &sender_identities[3].0.clone(),
+            &test_helpers::good_gateway_bond(),
+        );
+        execute(deps.as_mut(), mock_env(), info, messages[3].clone()).unwrap();
+
+        let page2 = query_gateways_paged(
+            deps.as_ref(),
+            Option::from(start_after),
+            Option::from(per_page),
+        )
+        .unwrap();
+
+        // now we have 2 pages, with 2 results on the second page
+        assert_eq!(2, page2.nodes.len());
+    }
+
+    #[test]
+    fn query_for_gateway_owner_works() {
+        let mut deps = test_helpers::init_contract();
+
+        // "fred" does not own a mixnode if there are no mixnodes
+        let res = query_owns_gateway(deps.as_ref(), "fred".to_string()).unwrap();
+        assert!(res.gateway.is_none());
+
+        // mixnode was added to "bob", "fred" still does not own one
+        test_helpers::add_gateway("bob", test_helpers::good_gateway_bond(), deps.as_mut());
+
+        let res = query_owns_gateway(deps.as_ref(), "fred".to_string()).unwrap();
+        assert!(res.gateway.is_none());
+
+        // "fred" now owns a gateway!
+        test_helpers::add_gateway("fred", test_helpers::good_gateway_bond(), deps.as_mut());
+
+        let res = query_owns_gateway(deps.as_ref(), "fred".to_string()).unwrap();
+        assert!(res.gateway.is_some());
+
+        // but after unbonding it, he doesn't own one anymore
+        crate::gateways::transactions::try_remove_gateway(deps.as_mut(), mock_info("fred", &[]))
+            .unwrap();
+
+        let res = query_owns_gateway(deps.as_ref(), "fred".to_string()).unwrap();
+        assert!(res.gateway.is_none());
+    }
+}
@@ -0,0 +1,108 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use cosmwasm_std::Addr;
+use cw_storage_plus::{Index, IndexList, IndexedMap, UniqueIndex};
+use mixnet_contract::{GatewayBond, IdentityKeyRef};
+
+// storage prefixes
+const GATEWAYS_PK_NAMESPACE: &str = "gt";
+const GATEWAYS_OWNER_IDX_NAMESPACE: &str = "gto";
+
+pub(crate) struct GatewayBondIndex<'a> {
+    pub(crate) owner: UniqueIndex<'a, Addr, GatewayBond>,
+}
+
+// IndexList is just boilerplate code for fetching a struct's indexes
+// note that from my understanding this will be converted into a macro at some point in the future
+impl<'a> IndexList<GatewayBond> for GatewayBondIndex<'a> {
+    fn get_indexes(&'_ self) -> Box<dyn Iterator<Item = &'_ dyn Index<GatewayBond>> + '_> {
+        let v: Vec<&dyn Index<GatewayBond>> = vec![&self.owner];
+        Box::new(v.into_iter())
+    }
+}
+
+// gateways() is the storage access function.
+pub(crate) fn gateways<'a>() -> IndexedMap<'a, IdentityKeyRef<'a>, GatewayBond, GatewayBondIndex<'a>>
+{
+    let indexes = GatewayBondIndex {
+        owner: UniqueIndex::new(|d| d.owner.clone(), GATEWAYS_OWNER_IDX_NAMESPACE),
+    };
+    IndexedMap::new(GATEWAYS_PK_NAMESPACE, indexes)
+}
+
+// currently not used outside tests
+#[cfg(test)]
+mod tests {
+    use super::super::storage;
+    use crate::support::tests::test_helpers;
+    use config::defaults::DENOM;
+    use cosmwasm_std::testing::MockStorage;
+    use cosmwasm_std::StdResult;
+    use cosmwasm_std::Storage;
+    use cosmwasm_std::{coin, Addr, Uint128};
+    use mixnet_contract::GatewayBond;
+    use mixnet_contract::IdentityKey;
+    use mixnet_contract::{Gateway, IdentityKeyRef};
+
+    // currently this is only used in tests but may become useful later on
+    pub(crate) fn read_gateway_pledge_amount(
+        storage: &dyn Storage,
+        identity: IdentityKeyRef,
+    ) -> StdResult<cosmwasm_std::Uint128> {
+        let node = storage::gateways().load(storage, identity)?;
+        Ok(node.pledge_amount.amount)
+    }
+
+    #[test]
+    fn gateway_single_read_retrieval() {
+        let mut storage = MockStorage::new();
+        let bond1 = test_helpers::gateway_bond_fixture("owner1");
+        let bond2 = test_helpers::gateway_bond_fixture("owner2");
+        storage::gateways()
+            .save(&mut storage, "bond1", &bond1)
+            .unwrap();
+        storage::gateways()
+            .save(&mut storage, "bond2", &bond2)
+            .unwrap();
+
+        let res1 = storage::gateways().load(&storage, "bond1").unwrap();
+        let res2 = storage::gateways().load(&storage, "bond2").unwrap();
+        assert_eq!(bond1, res1);
+        assert_eq!(bond2, res2);
+    }
+
+    #[test]
+    fn reading_gateway_bond() {
+        let mut mock_storage = MockStorage::new();
+        let node_owner: Addr = Addr::unchecked("node-owner");
+        let node_identity: IdentityKey = "nodeidentity".into();
+
+        // produces an error if target gateway doesn't exist
+        let res = read_gateway_pledge_amount(&mock_storage, &node_identity);
+        assert!(res.is_err());
+
+        // returns appropriate value otherwise
+        let pledge_amount = 1000;
+
+        let gateway_bond = GatewayBond {
+            pledge_amount: coin(pledge_amount, DENOM),
+            owner: node_owner.clone(),
+            block_height: 12_345,
+            gateway: Gateway {
+                identity_key: node_identity.clone(),
+                ..test_helpers::gateway_fixture()
+            },
+            proxy: None,
+        };
+
+        storage::gateways()
+            .save(&mut mock_storage, &node_identity, &gateway_bond)
+            .unwrap();
+
+        assert_eq!(
+            Uint128::new(pledge_amount),
+            read_gateway_pledge_amount(&mock_storage, &node_identity).unwrap()
+        );
+    }
+}
@@ -0,0 +1,569 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use super::storage;
+use crate::error::ContractError;
+use crate::mixnet_contract_settings::storage as mixnet_params_storage;
+use crate::support::helpers::{ensure_no_existing_bond, validate_node_identity_signature};
+use config::defaults::DENOM;
+use cosmwasm_std::{
+    coins, wasm_execute, Addr, BankMsg, Coin, DepsMut, Env, MessageInfo, Response, Uint128,
+};
+use mixnet_contract::{Gateway, GatewayBond, Layer};
+use vesting_contract::messages::ExecuteMsg as VestingContractExecuteMsg;
+
+pub fn try_add_gateway(
+    deps: DepsMut,
+    env: Env,
+    info: MessageInfo,
+    gateway: Gateway,
+    owner_signature: String,
+) -> Result<Response, ContractError> {
+    // check if the pledge contains any funds of the appropriate denomination
+    let minimum_pledge = mixnet_params_storage::CONTRACT_STATE
+        .load(deps.storage)?
+        .params
+        .minimum_mixnode_pledge;
+    let pledge = validate_gateway_pledge(info.funds, minimum_pledge)?;
+
+    _try_add_gateway(
+        deps,
+        env,
+        gateway,
+        pledge,
+        info.sender.as_str(),
+        owner_signature,
+        None,
+    )
+}
+
+pub fn try_add_gateway_on_behalf(
+    deps: DepsMut,
+    env: Env,
+    info: MessageInfo,
+    gateway: Gateway,
+    owner: String,
+    owner_signature: String,
+) -> Result<Response, ContractError> {
+    // check if the pledge contains any funds of the appropriate denomination
+    let minimum_pledge = mixnet_params_storage::CONTRACT_STATE
+        .load(deps.storage)?
+        .params
+        .minimum_mixnode_pledge;
+    let pledge = validate_gateway_pledge(info.funds, minimum_pledge)?;
+
+    let proxy = info.sender;
+    _try_add_gateway(
+        deps,
+        env,
+        gateway,
+        pledge,
+        &owner,
+        owner_signature,
+        Some(proxy),
+    )
+}
+
+pub(crate) fn _try_add_gateway(
+    deps: DepsMut,
+    env: Env,
+    gateway: Gateway,
+    pledge: Coin,
+    owner: &str,
+    owner_signature: String,
+    proxy: Option<Addr>,
+) -> Result<Response, ContractError> {
+    let owner = deps.api.addr_validate(owner)?;
+
+    // if the client has an active bonded mixnode or gateway, don't allow bonding
+    ensure_no_existing_bond(deps.storage, &owner)?;
+
+    // check if somebody else has already bonded a gateway with this identity
+    if let Some(existing_bond) =
+        storage::gateways().may_load(deps.storage, &gateway.identity_key)?
+    {
+        if existing_bond.owner != owner {
+            return Err(ContractError::DuplicateGateway {
+                owner: existing_bond.owner,
+            });
+        }
+    }
+
+    // check if this sender actually owns the gateway by checking the signature
+    validate_node_identity_signature(
+        deps.as_ref(),
+        &owner,
+        owner_signature,
+        &gateway.identity_key,
+    )?;
+
+    let bond = GatewayBond::new(pledge, owner, env.block.height, gateway, proxy);
+
+    storage::gateways().save(deps.storage, bond.identity(), &bond)?;
+    mixnet_params_storage::increment_layer_count(deps.storage, Layer::Gateway)?;
+
+    Ok(Response::new())
+}
+
+pub fn try_remove_gateway_on_behalf(
+    deps: DepsMut,
+    info: MessageInfo,
+    owner: String,
+) -> Result<Response, ContractError> {
+    let proxy = info.sender;
+    _try_remove_gateway(deps, &owner, Some(proxy))
+}
+
+pub fn try_remove_gateway(deps: DepsMut, info: MessageInfo) -> Result<Response, ContractError> {
+    _try_remove_gateway(deps, info.sender.as_ref(), None)
+}
+
+pub(crate) fn _try_remove_gateway(
+    deps: DepsMut,
+    owner: &str,
+    proxy: Option<Addr>,
+) -> Result<Response, ContractError> {
+    let owner = deps.api.addr_validate(owner)?;
+    // try to find the node of the sender
+    let gateway_bond = match storage::gateways()
+        .idx
+        .owner
+        .item(deps.storage, owner.clone())?
+    {
+        Some(record) => record.1,
+        None => return Err(ContractError::NoAssociatedGatewayBond { owner }),
+    };
+
+    if proxy != gateway_bond.proxy {
+        return Err(ContractError::ProxyMismatch {
+            existing: gateway_bond
+                .proxy
+                .map_or_else(|| "None".to_string(), |a| a.as_str().to_string()),
+            incoming: proxy.map_or_else(|| "None".to_string(), |a| a.as_str().to_string()),
+        });
+    }
+
+    // send bonded funds back to the bond owner
+    let return_tokens = BankMsg::Send {
+        to_address: proxy.as_ref().unwrap_or(&owner).to_string(),
+        amount: vec![gateway_bond.pledge_amount()],
+    };
+
+    // remove the bond
+    storage::gateways().remove(deps.storage, gateway_bond.identity())?;
+
+    // decrement layer count
+    mixnet_params_storage::decrement_layer_count(deps.storage, Layer::Gateway)?;
+
+    let mut response = Response::new()
+        .add_message(return_tokens)
+        .add_attribute("action", "unbond")
+        .add_attribute("address", owner.clone())
+        .add_attribute("gateway_bond", gateway_bond.to_string());
+
+    if let Some(proxy) = &proxy {
+        let msg = VestingContractExecuteMsg::TrackUnbondGateway {
+            owner: owner.as_str().to_string(),
+            amount: gateway_bond.pledge_amount,
+        };
+
+        let track_unbond_message = wasm_execute(proxy, &msg, coins(0, DENOM))?;
+        response = response.add_message(track_unbond_message);
+    }
+
+    Ok(response)
+}
+
+fn validate_gateway_pledge(
+    mut pledge: Vec<Coin>,
+    minimum_pledge: Uint128,
+) -> Result<Coin, ContractError> {
+    // check if anything was put as bond
+    if pledge.is_empty() {
+        return Err(ContractError::NoBondFound);
+    }
+
+    if pledge.len() > 1 {
+        return Err(ContractError::MultipleDenoms);
+    }
+
+    // check that the denomination is correct
+    if pledge[0].denom != DENOM {
+        return Err(ContractError::WrongDenom {});
+    }
+
+    // check that we have at least 100 coins in our pledge
+    if pledge[0].amount < minimum_pledge {
+        return Err(ContractError::InsufficientGatewayBond {
+            received: pledge[0].amount.into(),
+            minimum: minimum_pledge.into(),
+        });
+    }
+
+    Ok(pledge.pop().unwrap())
+}
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+    use crate::contract::{execute, query, INITIAL_GATEWAY_PLEDGE};
+    use crate::error::ContractError;
+    use crate::gateways::transactions::validate_gateway_pledge;
+    use crate::support::tests::test_helpers;
+    use config::defaults::DENOM;
+    use cosmwasm_std::attr;
+    use cosmwasm_std::testing::{mock_env, mock_info};
+    use cosmwasm_std::{coins, BankMsg, Response};
+    use cosmwasm_std::{from_binary, Addr, Uint128};
+    use mixnet_contract::Gateway;
+    use mixnet_contract::{ExecuteMsg, PagedGatewayResponse, QueryMsg};
+
+    #[test]
+    fn gateway_add() {
+        let mut deps = test_helpers::init_contract();
+
+        // if we fail validation (by say not sending enough funds
+        let insufficient_bond = Into::<u128>::into(INITIAL_GATEWAY_PLEDGE) - 1;
+        let info = mock_info("anyone", &coins(insufficient_bond, DENOM));
+        let (msg, _) = test_helpers::valid_bond_gateway_msg("anyone");
+
+        // we are informed that we didn't send enough funds
+        let result = execute(deps.as_mut(), mock_env(), info, msg);
+        assert_eq!(
+            result,
+            Err(ContractError::InsufficientGatewayBond {
+                received: insufficient_bond,
+                minimum: INITIAL_GATEWAY_PLEDGE.into(),
+            })
+        );
+
+        // make sure no gateway was inserted into the topology
+        let res = query(
+            deps.as_ref(),
+            mock_env(),
+            QueryMsg::GetGateways {
+                start_after: None,
+                limit: Option::from(2),
+            },
+        )
+        .unwrap();
+        let page: PagedGatewayResponse = from_binary(&res).unwrap();
+        assert_eq!(0, page.nodes.len());
+
+        // if we send enough funds
+        let info = mock_info("anyone", &test_helpers::good_gateway_bond());
+        let (msg, identity) = test_helpers::valid_bond_gateway_msg("anyone");
+
+        // we get back a message telling us everything was OK
+        let execute_response = execute(deps.as_mut(), mock_env(), info, msg);
+        assert!(execute_response.is_ok());
+
+        // we can query topology and the new node is there
+        let query_response = query(
+            deps.as_ref(),
+            mock_env(),
+            QueryMsg::GetGateways {
+                start_after: None,
+                limit: Option::from(2),
+            },
+        )
+        .unwrap();
+        let page: PagedGatewayResponse = from_binary(&query_response).unwrap();
+        assert_eq!(1, page.nodes.len());
+        assert_eq!(
+            &Gateway {
+                identity_key: identity,
+                ..test_helpers::gateway_fixture()
+            },
+            page.nodes[0].gateway()
+        );
+
+        // if there was already a gateway bonded by particular user
+        let info = mock_info("foomper", &test_helpers::good_gateway_bond());
+        let (msg, _) = test_helpers::valid_bond_gateway_msg("foomper");
+        execute(deps.as_mut(), mock_env(), info, msg).unwrap();
+
+        let info = mock_info("foomper", &test_helpers::good_gateway_bond());
+        let (msg, _) = test_helpers::valid_bond_gateway_msg("foomper");
+
+        // it fails
+        let execute_response = execute(deps.as_mut(), mock_env(), info, msg);
+        assert_eq!(Err(ContractError::AlreadyOwnsGateway), execute_response);
+
+        // bonding fails if the user already owns a mixnode
+        test_helpers::add_mixnode(
+            "mixnode-owner",
+            test_helpers::good_mixnode_bond(),
+            deps.as_mut(),
+        );
+
+        let info = mock_info("mixnode-owner", &test_helpers::good_gateway_bond());
+        let (msg, _) = test_helpers::valid_bond_gateway_msg("mixnode-owner");
+
+        let execute_response = execute(deps.as_mut(), mock_env(), info, msg);
+        assert_eq!(execute_response, Err(ContractError::AlreadyOwnsMixnode));
+
+        // but after he unbonds it, it's all fine again
+        let info = mock_info("mixnode-owner", &[]);
+        let msg = ExecuteMsg::UnbondMixnode {};
+        execute(deps.as_mut(), mock_env(), info, msg).unwrap();
+
+        let info = mock_info("mixnode-owner", &test_helpers::good_gateway_bond());
+        let (msg, _) = test_helpers::valid_bond_gateway_msg("mixnode-owner");
+
+        let execute_response = execute(deps.as_mut(), mock_env(), info, msg);
+        assert!(execute_response.is_ok());
+
+        // adding another node from another account, but with the same IP, should fail (or we would have a weird state).
+        // Is that right? Think about this, not sure yet.
+    }
+
+    #[test]
+    fn adding_gateway_without_existing_owner() {
+        let mut deps = test_helpers::init_contract();
+
+        let info = mock_info("gateway-owner", &test_helpers::good_gateway_bond());
+
+        // before the execution the node had no associated owner
+        assert!(storage::gateways()
+            .idx
+            .owner
+            .item(deps.as_ref().storage, Addr::unchecked("gateway-owner"))
+            .unwrap()
+            .is_none());
+
+        let (msg, identity) = test_helpers::valid_bond_gateway_msg("gateway-owner");
+
+        // it's all fine, owner is saved
+        let execute_response = execute(deps.as_mut(), mock_env(), info, msg);
+        assert!(execute_response.is_ok());
+
+        assert_eq!(
+            &identity,
+            storage::gateways()
+                .idx
+                .owner
+                .item(deps.as_ref().storage, Addr::unchecked("gateway-owner"))
+                .unwrap()
+                .unwrap()
+                .1
+                .identity()
+        );
+    }
+
+    #[test]
+    fn adding_gateway_with_existing_owner() {
+        let mut deps = test_helpers::init_contract();
+
+        let identity = test_helpers::add_gateway(
+            "gateway-owner",
+            test_helpers::good_gateway_bond(),
+            deps.as_mut(),
+        );
+
+        // request fails giving the existing owner address in the message
+        let info = mock_info(
+            "gateway-owner-pretender",
+            &test_helpers::good_gateway_bond(),
+        );
+        let msg = ExecuteMsg::BondGateway {
+            gateway: Gateway {
+                identity_key: identity,
+                ..test_helpers::gateway_fixture()
+            },
+            owner_signature: "foomp".to_string(),
+        };
+
+        let execute_response = execute(deps.as_mut(), mock_env(), info, msg);
+        assert_eq!(
+            Err(ContractError::DuplicateGateway {
+                owner: Addr::unchecked("gateway-owner")
+            }),
+            execute_response
+        );
+    }
+
+    #[test]
+    fn adding_gateway_with_existing_unchanged_owner() {
+        let mut deps = test_helpers::init_contract();
+
+        test_helpers::add_gateway(
+            "gateway-owner",
+            test_helpers::good_gateway_bond(),
+            deps.as_mut(),
+        );
+
+        let info = mock_info("gateway-owner", &test_helpers::good_gateway_bond());
+        let (msg, _) = test_helpers::valid_bond_gateway_msg("gateway-owner");
+
+        let res = execute(deps.as_mut(), mock_env(), info, msg);
+        assert_eq!(Err(ContractError::AlreadyOwnsGateway), res);
+    }
+
+    #[test]
+    fn gateway_remove() {
+        let mut deps = test_helpers::init_contract();
+
+        // try unbond when no nodes exist yet
+        let info = mock_info("anyone", &[]);
+        let msg = ExecuteMsg::UnbondGateway {};
+        let result = execute(deps.as_mut(), mock_env(), info, msg);
+
+        // we're told that there is no node for our address
+        assert_eq!(
+            result,
+            Err(ContractError::NoAssociatedGatewayBond {
+                owner: Addr::unchecked("anyone")
+            })
+        );
+
+        // let's add a node owned by bob
+        test_helpers::add_gateway("bob", test_helpers::good_gateway_bond(), deps.as_mut());
+
+        // attempt to unbond fred's node, which doesn't exist
+        let info = mock_info("fred", &[]);
+        let msg = ExecuteMsg::UnbondGateway {};
+        let result = execute(deps.as_mut(), mock_env(), info, msg);
+        assert_eq!(
+            result,
+            Err(ContractError::NoAssociatedGatewayBond {
+                owner: Addr::unchecked("fred")
+            })
+        );
+
+        // bob's node is still there
+        let nodes = test_helpers::get_gateways(&mut deps);
+        assert_eq!(1, nodes.len());
+
+        let first_node = &nodes[0];
+        assert_eq!(&Addr::unchecked("bob"), first_node.owner());
+
+        // add a node owned by fred
+        let fred_identity =
+            test_helpers::add_gateway("fred", test_helpers::good_gateway_bond(), deps.as_mut());
+
+        // let's make sure we now have 2 nodes:
+        assert_eq!(2, test_helpers::get_gateways(&mut deps).len());
+
+        // unbond fred's node
+        let info = mock_info("fred", &[]);
+        let msg = ExecuteMsg::UnbondGateway {};
+        let remove_fred = execute(deps.as_mut(), mock_env(), info.clone(), msg).unwrap();
+
+        // we should see log messages come back showing an unbond message
+        let expected_attributes = vec![
+            attr("action", "unbond"),
+            attr("address", "fred"),
+            attr(
+                "gateway_bond",
+                format!(
+                    "amount: {} {}, owner: fred, identity: {}",
+                    INITIAL_GATEWAY_PLEDGE, DENOM, fred_identity
+                ),
+            ),
+        ];
+
+        // we should see a funds transfer from the contract back to fred
+        let expected_message = BankMsg::Send {
+            to_address: String::from(info.sender),
+            amount: test_helpers::good_gateway_bond(),
+        };
+
+        // run the executor and check that we got back the correct results
+        let expected = Response::new()
+            .add_attributes(expected_attributes)
+            .add_message(expected_message);
+
+        assert_eq!(remove_fred, expected);
+
+        // only 1 node now exists, owned by bob:
+        let gateway_bonds = test_helpers::get_gateways(&mut deps);
+        assert_eq!(1, gateway_bonds.len());
+        assert_eq!(&Addr::unchecked("bob"), gateway_bonds[0].owner());
+    }
+
+    #[test]
+    fn removing_gateway_clears_ownership() {
+        let mut deps = test_helpers::init_contract();
+
+        let info = mock_info("gateway-owner", &test_helpers::good_gateway_bond());
+        let (bond_msg, identity) = test_helpers::valid_bond_gateway_msg("gateway-owner");
+        execute(deps.as_mut(), mock_env(), info, bond_msg.clone()).unwrap();
+
+        assert_eq!(
+            &identity,
+            storage::gateways()
+                .idx
+                .owner
+                .item(deps.as_ref().storage, Addr::unchecked("gateway-owner"))
+                .unwrap()
+                .unwrap()
+                .1
+                .identity()
+        );
+
+        let info = mock_info("gateway-owner", &[]);
+        let msg = ExecuteMsg::UnbondGateway {};
+
+        assert!(execute(deps.as_mut(), mock_env(), info, msg).is_ok());
+
+        assert!(storage::gateways()
+            .idx
+            .owner
+            .item(deps.as_ref().storage, Addr::unchecked("gateway-owner"))
+            .unwrap()
+            .is_none());
+
+        // and since it's removed, it can be reclaimed
+        let info = mock_info("gateway-owner", &test_helpers::good_gateway_bond());
+
+        assert!(execute(deps.as_mut(), mock_env(), info, bond_msg).is_ok());
+        assert_eq!(
+            &identity,
+            storage::gateways()
+                .idx
+                .owner
+                .item(deps.as_ref().storage, Addr::unchecked("gateway-owner"))
+                .unwrap()
+                .unwrap()
+                .1
+                .identity()
+        );
+    }
+
+    #[test]
+    fn validating_gateway_bond() {
+        // you must send SOME funds
+        let result = validate_gateway_pledge(Vec::new(), INITIAL_GATEWAY_PLEDGE);
+        assert_eq!(result, Err(ContractError::NoBondFound));
+
+        // you must send at least 100 coins...
+        let mut bond = test_helpers::good_gateway_bond();
+        bond[0].amount = INITIAL_GATEWAY_PLEDGE.checked_sub(Uint128::new(1)).unwrap();
+        let result = validate_gateway_pledge(bond.clone(), INITIAL_GATEWAY_PLEDGE);
+        assert_eq!(
+            result,
+            Err(ContractError::InsufficientGatewayBond {
+                received: Into::<u128>::into(INITIAL_GATEWAY_PLEDGE) - 1,
+                minimum: INITIAL_GATEWAY_PLEDGE.into(),
+            })
+        );
+
+        // more than that is still fine
+        let mut bond = test_helpers::good_gateway_bond();
+        bond[0].amount = INITIAL_GATEWAY_PLEDGE + Uint128::new(1);
+        let result = validate_gateway_pledge(bond.clone(), INITIAL_GATEWAY_PLEDGE);
+        assert!(result.is_ok());
+
+        // it must be sent in the defined denom!
+        let mut bond = test_helpers::good_gateway_bond();
+        bond[0].denom = "baddenom".to_string();
+        let result = validate_gateway_pledge(bond.clone(), INITIAL_GATEWAY_PLEDGE);
+        assert_eq!(result, Err(ContractError::WrongDenom {}));
+
+        let mut bond = test_helpers::good_gateway_bond();
+        bond[0].denom = "foomp".to_string();
+        let result = validate_gateway_pledge(bond.clone(), INITIAL_GATEWAY_PLEDGE);
+        assert_eq!(result, Err(ContractError::WrongDenom {}));
+    }
+}
@@ -1,389 +0,0 @@
-// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
-// SPDX-License-Identifier: Apache-2.0
-
-use crate::error::ContractError;
-use crate::transactions::OLD_DELEGATIONS_CHUNK_SIZE;
-use cosmwasm_std::{Decimal, Order, StdError, StdResult, Uint128};
-use cosmwasm_storage::ReadonlyBucket;
-use mixnet_contract::{Addr, IdentityKey, PagedAllDelegationsResponse, UnpackedDelegation};
-use serde::de::DeserializeOwned;
-use serde::Serialize;
-use std::ops::Sub;
-
-// for time being completely ignore concept of a leap year and assume each year is exactly 365 days
-// i.e. 8760 hours
-const HOURS_IN_YEAR: u128 = 8760;
-
-const DECIMAL_FRACTIONAL: Uint128 = Uint128(1_000_000_000_000_000_000u128);
-
-// cosmwasm bucket internal value
-const NAMESPACE_LENGTH: usize = 2;
-
-pub fn decimal_to_uint128(value: Decimal) -> Uint128 {
-    value * DECIMAL_FRACTIONAL
-}
-
-pub fn uint128_to_decimal(value: Uint128) -> Decimal {
-    Decimal::from_ratio(value, DECIMAL_FRACTIONAL)
-}
-
-pub(crate) fn calculate_epoch_reward_rate(
-    epoch_length: u32,
-    annual_reward_rate: Decimal,
-) -> Decimal {
-    // this is more of a sanity check as the contract does not allow setting annual reward rates
-    // to be lower than 1.
-    debug_assert!(annual_reward_rate >= Decimal::one());
-
-    // converts reward rate, like 1.25 into the expected gain, like 0.25
-    let annual_reward = annual_reward_rate.sub(Decimal::one());
-    // do a simple cross-multiplication:
-    // `annual_reward`  -    `HOURS_IN_YEAR`
-    //          x       -    `epoch_length`
-    //
-    // x = `annual_reward` * `epoch_length` / `HOURS_IN_YEAR`
-
-    // converts reward, like 0.25 into 250000000000000000
-    let annual_reward_uint128 = decimal_to_uint128(annual_reward);
-
-    // calculates `annual_reward_uint128` * `epoch_length` / `HOURS_IN_YEAR`
-    let epoch_reward_uint128 = annual_reward_uint128.multiply_ratio(epoch_length, HOURS_IN_YEAR);
-
-    // note: this returns a % reward, like 0.05 rather than reward rate (like 1.05)
-    uint128_to_decimal(epoch_reward_uint128)
-}
-
-pub(crate) fn scale_reward_by_uptime(
-    reward: Decimal,
-    uptime: u32,
-) -> Result<Decimal, ContractError> {
-    if uptime > 100 {
-        return Err(ContractError::UnexpectedUptime);
-    }
-    let uptime_ratio = Decimal::from_ratio(uptime, 100u128);
-    // if we do not convert into a more precise representation, we might end up with, for example,
-    // reward 0.05 and uptime of 50% which would produce 0.50 * 0.05 = 0 (because of u128 representation)
-    // and also the above would be impossible to compute as Mul<Decimal> for Decimal is not implemented
-    //
-    // but with the intermediate conversion, we would have
-    // 0.50 * 50_000_000_000_000_000 = 25_000_000_000_000_000
-    // which converted back would give us the proper 0.025
-    let uptime_ratio_u128 = decimal_to_uint128(uptime_ratio);
-    let scaled = reward * uptime_ratio_u128;
-    Ok(uint128_to_decimal(scaled))
-}
-
-// Extracts the node identity and owner of a delegation from the bytes used as
-// key in the delegation buckets.
-fn extract_identity_and_owner(bytes: Vec<u8>) -> StdResult<(Addr, IdentityKey)> {
-    if bytes.len() < NAMESPACE_LENGTH {
-        return Err(StdError::parse_err(
-            "mixnet_contract::types::IdentityKey",
-            "Invalid type",
-        ));
-    }
-    let identity_size = u16::from_be_bytes([bytes[0], bytes[1]]) as usize;
-    let identity_bytes: Vec<u8> = bytes
-        .iter()
-        .skip(NAMESPACE_LENGTH)
-        .take(identity_size)
-        .copied()
-        .collect();
-    let identity = IdentityKey::from_utf8(identity_bytes)
-        .map_err(|_| StdError::parse_err("mixnet_contract::types::IdentityKey", "Invalid type"))?;
-    let owner_bytes: Vec<u8> = bytes
-        .iter()
-        .skip(NAMESPACE_LENGTH + identity_size)
-        .copied()
-        .collect();
-    let owner = Addr::unchecked(
-        String::from_utf8(owner_bytes)
-            .map_err(|_| StdError::parse_err("cosmwasm_std::addresses::Addr", "Invalid type"))?,
-    );
-
-    Ok((owner, identity))
-}
-
-// currently not used outside tests
-#[cfg(test)]
-// Converts the node identity and owner of a delegation into the bytes used as
-// key in the delegation buckets.
-pub(crate) fn identity_and_owner_to_bytes(identity: &IdentityKey, owner: &Addr) -> Vec<u8> {
-    let mut bytes = u16::to_be_bytes(identity.len() as u16).to_vec();
-    bytes.append(&mut identity.as_bytes().to_vec());
-    bytes.append(&mut owner.as_bytes().to_vec());
-
-    bytes
-}
-
-pub(crate) fn get_all_delegations_paged<T>(
-    bucket: &ReadonlyBucket<T>,
-    start_after: &Option<Vec<u8>>,
-    limit: usize,
-) -> StdResult<PagedAllDelegationsResponse<T>>
-where
-    T: Serialize + DeserializeOwned,
-{
-    let delegations = bucket
-        .range(start_after.as_deref(), None, Order::Ascending)
-        .filter(|res| res.is_ok())
-        .take(limit)
-        .map(|res| {
-            res.map(|entry| {
-                let (owner, identity) = extract_identity_and_owner(entry.0).expect("Invalid node identity or address used as key in bucket. The storage is corrupted!");
-                UnpackedDelegation::new(owner, identity, entry.1)
-            })
-        })
-        .collect::<StdResult<Vec<UnpackedDelegation<T>>>>()?;
-
-    let start_next_after = if let Some(Ok(last)) = bucket
-        .range(start_after.as_deref(), None, Order::Ascending)
-        .filter(|res| res.is_ok())
-        .take(limit)
-        .last()
-    {
-        Some(last.0)
-    } else {
-        None
-    };
-
-    Ok(PagedAllDelegationsResponse::new(
-        delegations,
-        start_next_after,
-    ))
-}
-
-pub struct Delegations<'a, T: Clone + Serialize + DeserializeOwned> {
-    delegations_bucket: ReadonlyBucket<'a, T>,
-    curr_delegations: Vec<UnpackedDelegation<T>>,
-    curr_index: usize,
-    start_after: Option<Vec<u8>>,
-    last_page: bool,
-}
-
-impl<'a, T: Clone + Serialize + DeserializeOwned> Delegations<'a, T> {
-    pub fn new(delegations_bucket: ReadonlyBucket<'a, T>) -> Self {
-        Delegations {
-            delegations_bucket,
-            curr_delegations: vec![],
-            curr_index: OLD_DELEGATIONS_CHUNK_SIZE,
-            start_after: None,
-            last_page: false,
-        }
-    }
-}
-
-impl<'a, T: Clone + Serialize + DeserializeOwned> Iterator for Delegations<'a, T> {
-    type Item = UnpackedDelegation<T>;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        if self.curr_index == OLD_DELEGATIONS_CHUNK_SIZE && !self.last_page {
-            self.start_after = self.start_after.clone().map(|mut v: Vec<u8>| {
-                v.push(0);
-                v
-            });
-            let delegations_paged = get_all_delegations_paged(
-                &self.delegations_bucket,
-                &self.start_after,
-                OLD_DELEGATIONS_CHUNK_SIZE,
-            )
-            .ok()?;
-            self.curr_delegations = delegations_paged.delegations;
-            self.curr_index = 0;
-            self.start_after = delegations_paged.start_next_after;
-            if self.start_after.is_none() {
-                self.last_page = true;
-            }
-        }
-        if self.curr_index < self.curr_delegations.len() {
-            let ret = self.curr_delegations[self.curr_index].clone();
-            self.curr_index += 1;
-            Some(ret)
-        } else {
-            None
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::queries::tests::store_n_mix_delegations;
-    use crate::storage::{all_mix_delegations_read, mix_delegations};
-    use crate::support::tests::helpers;
-    use cosmwasm_std::testing::mock_dependencies;
-    use mixnet_contract::RawDelegationData;
-    use std::str::FromStr;
-
-    #[test]
-    fn delegations_iterator() {
-        let mut deps = helpers::init_contract();
-        let node_identity: IdentityKey = "foo".into();
-
-        store_n_mix_delegations(
-            2 * OLD_DELEGATIONS_CHUNK_SIZE as u32,
-            &mut deps.storage,
-            &node_identity,
-        );
-        let mix_bucket = all_mix_delegations_read::<RawDelegationData>(&deps.storage);
-        let mut delegations = Delegations::new(mix_bucket);
-        assert!(delegations.curr_delegations.is_empty());
-        assert_eq!(delegations.curr_index, OLD_DELEGATIONS_CHUNK_SIZE);
-        delegations.next().unwrap();
-        assert_eq!(
-            delegations.curr_delegations.len(),
-            OLD_DELEGATIONS_CHUNK_SIZE
-        );
-        assert_eq!(delegations.curr_index, 1);
-        for _ in 0..OLD_DELEGATIONS_CHUNK_SIZE {
-            delegations.next().unwrap();
-        }
-        assert_eq!(
-            delegations.curr_delegations.len(),
-            OLD_DELEGATIONS_CHUNK_SIZE
-        );
-        assert_eq!(delegations.curr_index, 1);
-        for _ in 0..OLD_DELEGATIONS_CHUNK_SIZE - 1 {
-            delegations.next().unwrap();
-        }
-        assert!(delegations.next().is_none());
-    }
-
-    #[test]
-    fn calculating_epoch_reward_rate() {
-        // 1.10
-        let annual_reward_rate = Decimal::from_ratio(110u128, 100u128);
-
-        // if the epoch is (for some reason) exactly one year,
-        // the reward rate should be unchanged
-        let per_epoch_rate = calculate_epoch_reward_rate(HOURS_IN_YEAR as u32, annual_reward_rate);
-        // 0.10
-        let expected = annual_reward_rate.sub(Decimal::one());
-        assert_eq!(expected, per_epoch_rate);
-
-        // 24 hours
-        let per_epoch_rate = calculate_epoch_reward_rate(24, annual_reward_rate);
-        // 0.1 / 365
-        let expected = Decimal::from_ratio(1u128, 3650u128);
-        assert_eq!(expected, per_epoch_rate);
-
-        let expected_per_epoch_rate_excel = Decimal::from_str("0.000273972602739726").unwrap();
-        assert_eq!(expected_per_epoch_rate_excel, per_epoch_rate);
-
-        // 1 hour
-        let per_epoch_rate = calculate_epoch_reward_rate(1, annual_reward_rate);
-        // 0.1 / 8760
-        let expected = Decimal::from_ratio(1u128, 87600u128);
-        assert_eq!(expected, per_epoch_rate);
-    }
-
-    #[test]
-    fn scaling_reward_by_uptime() {
-        // 0.05
-        let epoch_reward = Decimal::from_ratio(5u128, 100u128);
-
-        // scaling by 100 does nothing
-        let scaled = scale_reward_by_uptime(epoch_reward, 100).unwrap();
-        assert_eq!(epoch_reward, scaled);
-
-        // scaling by 0 makes the reward 0
-        let scaled = scale_reward_by_uptime(epoch_reward, 0).unwrap();
-        assert_eq!(Decimal::zero(), scaled);
-
-        // 50 halves it
-        let scaled = scale_reward_by_uptime(epoch_reward, 50).unwrap();
-        let expected = Decimal::from_ratio(25u128, 1000u128);
-        assert_eq!(expected, scaled);
-
-        // 10 takes 1/10th
-        let scaled = scale_reward_by_uptime(epoch_reward, 10).unwrap();
-        let expected = Decimal::from_ratio(5u128, 1000u128);
-        assert_eq!(expected, scaled);
-
-        // anything larger than 100 returns an error
-        assert!(scale_reward_by_uptime(epoch_reward, 101).is_err())
-    }
-
-    #[test]
-    fn identity_and_owner_deserialization() {
-        assert!(extract_identity_and_owner(vec![]).is_err());
-        assert!(extract_identity_and_owner(vec![0]).is_err());
-        let (owner, identity) = extract_identity_and_owner(vec![
-            0, 7, 109, 105, 120, 110, 111, 100, 101, 97, 108, 105, 99, 101,
-        ])
-        .unwrap();
-        assert_eq!(owner, "alice");
-        assert_eq!(identity, "mixnode");
-    }
-
-    #[test]
-    fn identity_and_owner_serialization() {
-        let identity: IdentityKey = "gateway".into();
-        let owner = Addr::unchecked("bob");
-        assert_eq!(
-            vec![0, 7, 103, 97, 116, 101, 119, 97, 121, 98, 111, 98],
-            identity_and_owner_to_bytes(&identity, &owner)
-        );
-    }
-
-    #[test]
-    fn all_mix_delegations() {
-        let mut deps = mock_dependencies(&[]);
-        let node_identity1: IdentityKey = "foo1".into();
-        let delegation_owner1 = Addr::unchecked("bar1");
-        let node_identity2: IdentityKey = "foo2".into();
-        let delegation_owner2 = Addr::unchecked("bar2");
-        let raw_delegation = RawDelegationData::new(1000u128.into(), 42);
-        let mut start_after = None;
-
-        mix_delegations(&mut deps.storage, &node_identity1)
-            .save(delegation_owner1.as_bytes(), &raw_delegation)
-            .unwrap();
-
-        let bucket = all_mix_delegations_read::<RawDelegationData>(&deps.storage);
-        let response =
-            get_all_delegations_paged::<RawDelegationData>(&bucket, &start_after, 10).unwrap();
-        start_after = response.start_next_after;
-        let delegations = response.delegations;
-        assert_eq!(delegations.len(), 1);
-        assert_eq!(
-            delegations[0],
-            UnpackedDelegation::new(
-                delegation_owner1.clone(),
-                node_identity1.clone(),
-                raw_delegation.clone()
-            )
-        );
-
-        mix_delegations(&mut deps.storage, &node_identity2)
-            .save(delegation_owner2.as_bytes(), &raw_delegation)
-            .unwrap();
-
-        let bucket = all_mix_delegations_read::<RawDelegationData>(&deps.storage);
-        let response =
-            get_all_delegations_paged::<RawDelegationData>(&bucket, &start_after, 10).unwrap();
-        start_after = response.start_next_after;
-        let delegations = response.delegations;
-        assert_eq!(delegations.len(), 2);
-        assert_eq!(
-            delegations[1],
-            UnpackedDelegation::new(
-                delegation_owner2.clone(),
-                node_identity2.clone(),
-                raw_delegation.clone()
-            )
-        );
-
-        mix_delegations(&mut deps.storage, &node_identity1).remove(delegation_owner1.as_bytes());
-
-        let bucket = all_mix_delegations_read::<RawDelegationData>(&deps.storage);
-        let response =
-            get_all_delegations_paged::<RawDelegationData>(&bucket, &start_after, 10).unwrap();
-        let delegations = response.delegations;
-        assert_eq!(delegations.len(), 1);
-        assert_eq!(
-            delegations[0],
-            UnpackedDelegation::new(delegation_owner2, node_identity2, raw_delegation.clone()),
-        );
-    }
-}
@@ -2,10 +2,10 @@
 // SPDX-License-Identifier: Apache-2.0

 pub mod contract;
-pub mod error;
-pub(crate) mod helpers;
-pub mod queries;
-pub mod state;
-pub(crate) mod storage;
-pub mod support;
-pub mod transactions;
+mod delegations;
+mod error;
+mod gateways;
+mod mixnet_contract_settings;
+mod mixnodes;
+mod rewards;
+mod support;
@@ -0,0 +1,7 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub mod models;
+pub mod queries;
+pub mod storage;
+pub mod transactions;
--- a/Show More
+++ b/Show More