Testing CI

Merge pull request #915 from nymtech/fix-mob-datagrids
Fix Mobile View for MUI data-grid (CARD 108)
2021-11-24 18:01:32 +00:00 · 2021-11-24 13:28:36 +00:00 · 2021-11-24 10:45:54 +00:00 · 2021-11-23 16:36:48 +00:00 · 2021-11-23 16:03:39 +00:00 · 2021-11-23 15:49:05 +00:00
332 changed files with 15301 additions and 4501 deletions
@@ -36,5 +36,5 @@ Cargo.* @durch @futurechimp @jstuczyn @neacsu

 # Explorer and wallet should probably get looked by the product team
 /explorer/ @nymtech/product 
-/tauri-wallet/ @nymtech/product 
+/nym-wallet/ @nymtech/product 
 /wallet-web/ @nymtech/product
@@ -9,14 +9,24 @@ on:
      - 'explorer/**'

 jobs:
+  matrix_prep:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    steps:
+      # creates the matrix strategy from build_matrix_includes.json
+      - uses: actions/checkout@v2
+      - id: set-matrix
+        uses: JoshuaTheMiller/conditional-build-matrix@main
+        with:
+          inputFile: '.github/workflows/build_matrix_includes.json'
+          filter: '[?runOnEvent==`${{ github.event_name }}` || runOnEvent==`always`]'
  build:
+    needs: matrix_prep
+    strategy:
+      matrix: ${{fromJson(needs.matrix_prep.outputs.matrix)}}
    runs-on: ${{ matrix.os }}
    continue-on-error: ${{ matrix.rust == 'nightly' || matrix.rust == 'beta' || matrix.os == 'windows-latest' }}
-    strategy:
-      matrix:
-        rust: [stable, beta, nightly]
-        os: [ubuntu-latest, macos-latest, windows-latest]
-
    steps:
      - name: Install Dependencies (Linux)
        run: sudo apt-get update && sudo apt-get install libwebkit2gtk-4.0-dev build-essential curl wget libssl-dev libgtk-3-dev squashfs-tools
@@ -51,6 +61,13 @@ jobs:
          command: fmt
          args: --all -- --check

+      - uses: actions-rs/clippy-check@v1
+        name: Clippy checks
+#        if: matrix.os == 'ubuntu-latest' && matrix.rust == 'stable'
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features
+
      - name: Run clippy
        uses: actions-rs/cargo@v1
        if: ${{ matrix.rust != 'nightly' }}
@@ -65,78 +82,21 @@ jobs:
        with:
          command: clean

-      # BUILD
-      - name: Build gateway with coconut feature
+      - name: Build all binaries with coconut enabled
        uses: actions-rs/cargo@v1
        with:
          command: build
-          args: --bin nym-gateway --features=coconut
+          args: --all --features=coconut

-      - name: Build native client with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --bin nym-client --features=coconut
-
-      - name: Build socks5 client with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --bin nym-socks5-client --features=coconut
-
-      - name: Build validator-api with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --bin nym-validator-api --features=coconut
-
-# TEST
-      - name: Test gateway with coconut feature
+      - name: Run all tests with coconut enabled
        uses: actions-rs/cargo@v1
        with:
          command: test
-          args: --bin nym-gateway --features=coconut
+          args: --all --features=coconut

-      - name: Test native client with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --bin nym-client --features=coconut
-
-      - name: Test socks5 client with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --bin nym-socks5-client --features=coconut
-
-      - name: Test validator-api with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: test
-          args: --bin nym-validator-api --features=coconut
-
-# CLIPPY
-
-      - name: Run clippy on gateway with coconut feature
+      - name: Run clippy with coconut enabled
        uses: actions-rs/cargo@v1
+        if: ${{ matrix.rust != 'nightly' }}
        with:
          command: clippy
-          args: --bin nym-gateway --features=coconut -- -D warnings
-
-      - name: Run clippy on native client with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --bin nym-client --features=coconut -- -D warnings
-
-      - name: Run clippy on socks5 client with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --bin nym-socks5-client --features=coconut -- -D warnings
-
-      - name: Run clippy on validator-api with coconut feature
-        uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: --bin nym-validator-api --features=coconut -- -D warnings
+          args: --features=coconut -- -D warnings
@@ -0,0 +1,50 @@
+[
+  {
+    "os":"ubuntu-latest",
+    "rust":"stable",
+    "runOnEvent":"always"
+  },
+
+  {
+    "os":"windows-latest",
+    "rust":"stable",
+    "runOnEvent":"pull_request"
+  },
+  {
+    "os":"macos-latest",
+    "rust":"stable",
+    "runOnEvent":"pull_request"
+  },
+
+  {
+    "os":"ubuntu-latest",
+    "rust":"beta",
+    "runOnEvent":"pull_request"
+  },
+  {
+    "os":"windows-latest",
+    "rust":"beta",
+    "runOnEvent":"pull_request"
+  },
+  {
+    "os":"macos-latest",
+    "rust":"beta",
+    "runOnEvent":"pull_request"
+  },
+
+  {
+    "os":"ubuntu-latest",
+    "rust":"nightly",
+    "runOnEvent":"pull_request"
+  },
+  {
+    "os":"windows-latest",
+    "rust":"nightly",
+    "runOnEvent":"pull_request"
+  },
+  {
+    "os":"macos-latest",
+    "rust":"nightly",
+    "runOnEvent":"pull_request"
+  }
+]
@@ -1,17 +0,0 @@
-name: Clippy check
-
-on:
-  push:
-    paths-ignore:
-      - 'explorer/**'
-
-jobs:
-  clippy_check:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v1
-      - run: rustup component add clippy
-      - uses: actions-rs/clippy-check@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features 
@@ -0,0 +1,14 @@
+[
+  {
+    "rust":"stable",
+    "runOnEvent":"always"
+  },
+  {
+    "rust":"beta",
+    "runOnEvent":"pull_request"
+  },
+  {
+    "rust":"nightly",
+    "runOnEvent":"pull_request"
+  }
+]
@@ -0,0 +1,58 @@
+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
@@ -9,14 +9,26 @@ on:
      - 'explorer/**'

 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`]'
  mixnet-contract:
    # 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' }}
+    needs: matrix_prep
    strategy:
-      matrix:
-        rust: [ stable, beta, nightly ]
+      matrix: ${{fromJson(needs.matrix_prep.outputs.matrix)}}
    steps:
      - uses: actions/checkout@v2

@@ -29,6 +41,8 @@ jobs:
          components: rustfmt, clippy

      - uses: actions-rs/cargo@v1
+        env:
+          RUSTFLAGS: '-C link-arg=-s'
        with:
          command: build
          args: --manifest-path contracts/mixnet/Cargo.toml --target wasm32-unknown-unknown
@@ -11,7 +11,7 @@ defaults:

 jobs:
  build:
-    runs-on: ubuntu-latest
+    runs-on: custom-runner-linux
    steps:
      - uses: actions/checkout@v2
      - uses: actions/setup-node@v2
@@ -11,7 +11,7 @@ defaults:

 jobs:
  build:
-    runs-on: ubuntu-latest
+    runs-on: custom-runner-linux
    steps:
    - uses: actions/checkout@v2
    - name: Install rsync
@@ -1,18 +1,18 @@
 name: Webdriverio tests for nym wallet

-on: 
- push:
+on:
+  push:
    paths:
-      - 'tauri-wallet/**'
-      
+      - "nym-wallet/**"
+
 defaults:
  run:
-    working-directory: tauri-wallet
+    working-directory: nym-wallet

 jobs:
  test:
    name: wallet tests
-    runs-on: ubuntu-latest 
+    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

@@ -30,8 +30,8 @@ jobs:
      - name: Install minimal stable
        uses: actions-rs/toolchain@v1
        with:
-         profile: minimal
-         toolchain: stable
+          profile: minimal
+          toolchain: stable

      - name: Node v16
        uses: actions/setup-node@v1
@@ -39,32 +39,32 @@ jobs:
          node-version: 16.x

      - name: Install yarn for building application
-        run: yarn install    
+        run: yarn install

      - name: Build application
        run: yarn run webpack:build & yarn run tauri:build
-        
+
      - name: Check binary exists
        run: |
-             cd target/release/
-             (test -f nym-wallet && echo nym binary exists) || echo wallet does not exist
+          cd target/release/
+          (test -f nym-wallet && echo nym binary exists) || echo wallet does not exist

      - name: Install dependencies
        run: yarn install
-        working-directory: tauri-wallet/webdriver
+        working-directory: nym-wallet/webdriver

      - name: Remove existing user datafile
        uses: JesseTG/rm@v1.0.2
        with:
-          path: tauri-wallet/webdriver/common/data/user-data.json
+          path: nym-wallet/webdriver/common/data/user-data.json

      - name: Create user data json file
        id: create-json
        uses: jsdaniell/create-json@1.1.2
        with:
-           name: "user-data.json"
-           json: ${{ secrets.WALLET_USERDATA }}
-           dir: 'tauri-wallet/webdriver/common/data/'
+          name: "user-data.json"
+          json: ${{ secrets.WALLET_USERDATA }}
+          dir: "nym-wallet/webdriver/common/data/"

      - name: Install tauri-driver
        uses: actions-rs/cargo@v1
@@ -74,4 +74,4 @@ jobs:

      - name: Launch tests
        run: xvfb-run yarn test:runall
-        working-directory: tauri-wallet/webdriver
+        working-directory: nym-wallet/webdriver
@@ -2,7 +2,7 @@ name: Publish Tauri Wallet
 on:
  push:
    tags:
-      - tauri-wallet-*
+      - nym-wallet-*

 jobs:
  build:
@@ -3,15 +3,15 @@ name: Generate TS types
 on:
  push:
    paths-ignore:
-      - 'explorer/**'
+      - "explorer/**"
  pull_request:
    paths-ignore:
-      - 'explorer/**'
+      - "explorer/**"

 jobs:
-  tauri-wallet-types:
+  nym-wallet-types:
    runs-on: ubuntu-latest
-    if: github.event_name != 'pull_request'
+    if: ${{ github.event_name != 'pull_request' }}
    steps:
      - name: Prepare
        run: sudo apt-get update && sudo apt-get install -y libpango1.0-dev libatk1.0-dev libgdk-pixbuf2.0-dev libsoup2.4-dev librust-gdk-dev libwebkit2gtk-4.0-dev
@@ -20,10 +20,10 @@ jobs:
        with:
          toolchain: stable
      - name: Generate TS
-        run: cd tauri-wallet/src-tauri && cargo test
+        run: cd nym-wallet/src-tauri && cargo test
      - uses: EndBug/add-and-commit@v7.2.1 # https://github.com/marketplace/actions/add-commit
        with:
-          add: '["tauri-wallet"]'
-          message: '[ci skip] Generate TS types'
+          add: '["nym-wallet"]'
+          message: "[ci skip] Generate TS types"
        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -1,9 +1,6 @@
 name: Wasm Client

 on:
-  push:
-    paths-ignore:
-      - 'explorer/**'
  pull_request:
    paths-ignore:
      - 'explorer/**'
@@ -22,10 +19,11 @@ jobs:
          override: true
          components: rustfmt, clippy

-      - uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --manifest-path clients/webassembly/Cargo.toml --target wasm32-unknown-unknown
+# token credentials (non-coconut) don't work for wasm right now
+#      - uses: actions-rs/cargo@v1
+#        with:
+#          command: build
+#          args: --manifest-path clients/webassembly/Cargo.toml --target wasm32-unknown-unknown

      - uses: actions-rs/cargo@v1
        with:
@@ -47,4 +45,4 @@ jobs:
 #      - uses: actions-rs/cargo@v1
 #        with:
 #          command: clippy
-#          args: --manifest-path clients/webassembly/Cargo.toml --target wasm32-unknown-unknown -- -D warnings
+#          args: --manifest-path clients/webassembly/Cargo.toml --target wasm32-unknown-unknown -- -D warnings
@@ -24,8 +24,14 @@ 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
 **/node_modules
 validator-api/keypair
+contracts/mixnet/code_id
+contracts/mixnet/Justfile
+contracts/mixnet/Makefile
+validator-config
+*.patch
@@ -93,6 +93,12 @@ version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4c527152e37cf757a3f78aae5a06fbeefdb07ccc535c980a3208ee3060dd544"

+[[package]]
+name = "arrayvec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+
 [[package]]
 name = "arrayvec"
 version = "0.7.1"
@@ -228,6 +234,12 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"

+[[package]]
+name = "az"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d6dff4a1892b54d70af377bf7a17064192e822865791d812957f21e3108c325"
+
 [[package]]
 name = "base-x"
 version = "0.2.8"
@@ -296,6 +308,18 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"

+[[package]]
+name = "bitvec"
+version = "0.20.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7774144344a4faa177370406a7ff5f1da24303817368584c6206c8303eb07848"
+dependencies = [
+ "funty",
+ "radium",
+ "tap",
+ "wyz",
+]
+
 [[package]]
 name = "blake2"
 version = "0.8.1"
@@ -315,7 +339,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dcd555c66291d5f836dbb6883b48660ece810fe25a31f3bdfb911945dff2691f"
 dependencies = [
 "arrayref",
- "arrayvec",
+ "arrayvec 0.7.1",
 "cc",
 "cfg-if 1.0.0",
 "constant_time_eq",
@@ -396,7 +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]]
@@ -405,12 +432,24 @@ version = "3.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9df67f7bf9ef8498769f994239c45613ef0c5899415fb58e9add412d2c1a538"

+[[package]]
+name = "byte-slice-cast"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca0796d76a983651b4a0ddda16203032759f2fd9103d9181f7c65c06ee8872e6"
+
 [[package]]
 name = "byte-tools"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"

+[[package]]
+name = "bytemuck"
+version = "1.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72957246c41db82b8ef88a5486143830adeb8227ef9837740bdec67724cf2c5b"
+
 [[package]]
 name = "byteorder"
 version = "1.4.3"
@@ -468,6 +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"
@@ -631,30 +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"
@@ -943,11 +972,49 @@ name = "credentials"
 version = "0.1.0"
 dependencies = [
 "coconut-interface",
+ "crypto",
+ "network-defaults",
 "thiserror",
 "url",
 "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"
@@ -1087,6 +1154,28 @@ 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"
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+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "ct-logs"
 version = "0.8.0"
@@ -1538,6 +1627,14 @@ dependencies = [
 "termcolor",
 ]

+[[package]]
+name = "erc20-bridge-contract"
+version = "0.1.0"
+dependencies = [
+ "schemars",
+ "serde",
+]
+
 [[package]]
 name = "error-chain"
 version = "0.12.4"
@@ -1547,6 +1644,49 @@ dependencies = [
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 ]

+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "anyhow",
+ "ethereum-types",
+ "hex",
+ "serde",
+ "serde_json",
+ "sha3",
+ "thiserror",
+ "uint",
+]
+
+[[package]]
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+checksum = "bfb684ac8fa8f6c5759f788862bb22ec6fe3cb392f6bfd08e3c64b603661e3f8"
+dependencies = [
+ "crunchy",
+ "fixed-hash",
+ "impl-rlp",
+ "impl-serde",
+ "tiny-keccak",
+]
+
+[[package]]
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+checksum = "f64b5df66a228d85e4b17e5d6c6aa43b0310898ffe8a85988c4c032357aaabfd"
+dependencies = [
+ "ethbloom",
+ "fixed-hash",
+ "impl-rlp",
+ "impl-serde",
+ "primitive-types",
+ "uint",
+]
+
 [[package]]
 name = "explorer-api"
 version = "0.1.0"
@@ -1642,6 +1782,31 @@ dependencies = [
 "winapi",
 ]

+[[package]]
+name = "fixed"
+version = "1.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d333a26ec13a023c6dff4b7584de4d323cfee2e508f5dd2bbee6669e4f7efdf"
+dependencies = [
+ "az",
+ "bytemuck",
+ "half",
+ "serde",
+ "typenum",
+]
+
+[[package]]
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+checksum = "cfcf0ed7fe52a17a03854ec54a9f76d6d84508d1c0e66bc1793301c73fc8493c"
+dependencies = [
+ "byteorder",
+ "rand 0.8.4",
+ "rustc-hex",
+ "static_assertions",
+]
+
 [[package]]
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 version = "1.0.22"
@@ -1738,6 +1903,12 @@ version = "0.1.1"
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 checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"

+[[package]]
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+checksum = "fed34cd105917e91daa4da6b3728c47b068749d6a62c59811f06ed2ac71d9da7"
+
 [[package]]
 name = "futf"
 version = "0.1.4"
@@ -1847,6 +2018,12 @@ version = "0.3.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d3d00f4eddb73e498a54394f228cd55853bdf059259e8e7bc6e69d408892e99"

+[[package]]
+name = "futures-timer"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e64b03909df88034c26dc1547e8970b91f98bdb65165d6a4e9110d94263dbb2c"
+
 [[package]]
 name = "futures-util"
 version = "0.3.17"
@@ -1882,20 +2059,27 @@ name = "gateway-client"
 version = "0.1.0"
 dependencies = [
 "coconut-interface",
+ "credentials",
 "crypto",
 "fluvio-wasm-timer",
 "futures",
 "gateway-requests",
 "getrandom 0.2.3",
+ "json",
 "log",
+ "network-defaults",
 "nymsphinx",
 "rand 0.7.3",
+ "secp256k1",
+ "thiserror",
 "tokio",
 "tokio-tungstenite",
 "tungstenite",
+ "url",
 "wasm-bindgen",
 "wasm-bindgen-futures",
 "wasm-utils",
+ "web3",
 ]

 [[package]]
@@ -2271,6 +2455,12 @@ dependencies = [
 "tracing",
 ]

+[[package]]
+name = "half"
+version = "1.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
+
 [[package]]
 name = "handlebars"
 version = "3.5.5"
@@ -2352,6 +2542,12 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"

+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21e4590e13640f19f249fe3e4eca5113bc4289f2497710378190e7f4bd96f45b"
+
 [[package]]
 name = "hkd32"
 version = "0.6.0"
@@ -2583,6 +2779,44 @@ dependencies = [
 "winapi-util",
 ]

+[[package]]
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+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "161ebdfec3c8e3b52bf61c4f3550a1eea4f9579d10dc1b936f3171ebdcd6c443"
+dependencies = [
+ "parity-scale-codec",
+]
+
+[[package]]
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+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f28220f89297a075ddc7245cd538076ee98b01f2a9c23a53a4f1105d5a322808"
+dependencies = [
+ "rlp",
+]
+
+[[package]]
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+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b47ca4d2b6931707a55fce5cf66aff80e2178c8b63bbb4ecb5695cbc870ddf6f"
+dependencies = [
+ "serde",
+]
+
+[[package]]
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+checksum = "d5dacb10c5b3bb92d46ba347505a9041e676bb20ad220101326bffb0c93031ee"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "indenter"
 version = "0.3.3"
@@ -2741,6 +2975,27 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
+name = "json"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "078e285eafdfb6c4b434e0d31e8cfcb5115b651496faca5749b88fafd4f23bfd"
+
+[[package]]
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+checksum = "14f7f76aef2d054868398427f6c54943cf3d1caa9a7ec7d0c38d69df97a965eb"
+dependencies = [
+ "futures",
+ "futures-executor",
+ "futures-util",
+ "log",
+ "serde",
+ "serde_derive",
+ "serde_json",
+]
+
 [[package]]
 name = "k256"
 version = "0.9.6"
@@ -2986,10 +3241,15 @@ dependencies = [
 name = "mixnet-contract"
 version = "0.1.0"
 dependencies = [
+ "az",
 "cosmwasm-std",
+ "fixed",
+ "log",
+ "network-defaults",
 "schemars",
 "serde",
 "serde_repr",
+ "thiserror",
 "ts-rs",
 ]

@@ -3107,6 +3367,7 @@ checksum = "c44922cb3dbb1c70b5e5f443d63b64363a898564d739ba5198e3a9138442868d"
 name = "network-defaults"
 version = "0.1.0"
 dependencies = [
+ "hex-literal",
 "serde",
 "time 0.3.3",
 "url",
@@ -3255,6 +3516,7 @@ dependencies = [
 "gateway-client",
 "gateway-requests",
 "log",
+ "network-defaults",
 "nymsphinx",
 "pemstore",
 "pretty_env_logger",
@@ -3299,6 +3561,7 @@ dependencies = [
 name = "nym-gateway"
 version = "0.11.0"
 dependencies = [
+ "bip39",
 "clap",
 "coconut-interface",
 "config",
@@ -3307,12 +3570,15 @@ dependencies = [
 "dashmap",
 "dirs",
 "dotenv",
+ "erc20-bridge-contract",
 "futures",
+ "gateway-client",
 "gateway-requests",
 "humantime-serde",
 "log",
 "mixnet-client",
 "mixnode-common",
+ "network-defaults",
 "nymsphinx",
 "pemstore",
 "pretty_env_logger",
@@ -3327,6 +3593,7 @@ dependencies = [
 "url",
 "validator-client",
 "version-checker",
+ "web3",
 ]

 [[package]]
@@ -3399,6 +3666,7 @@ dependencies = [
 "gateway-client",
 "gateway-requests",
 "log",
+ "network-defaults",
 "nymsphinx",
 "ordered-buffer",
 "pemstore",
@@ -3438,6 +3706,8 @@ dependencies = [
 "pin-project",
 "pretty_env_logger",
 "rand 0.7.3",
+ "rand 0.8.4",
+ "rand_chacha 0.3.1",
 "reqwest",
 "rocket",
 "rocket_cors",
@@ -3454,6 +3724,27 @@ 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"
@@ -3618,6 +3909,12 @@ version = "1.8.0"
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 checksum = "692fcb63b64b1758029e0a96ee63e049ce8c5948587f2f7208df04625e5f6b56"

+[[package]]
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+checksum = "0ab1bc2a289d34bd04a330323ac98a1b4bc82c9d9fcb1e66b63caa84da26b575"
+
 [[package]]
 name = "opaque-debug"
 version = "0.2.3"
@@ -3713,6 +4010,32 @@ dependencies = [
 "system-deps 3.2.0",
 ]

+[[package]]
+name = "parity-scale-codec"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "373b1a4c1338d9cd3d1fa53b3a11bdab5ab6bd80a20f7f7becd76953ae2be909"
+dependencies = [
+ "arrayvec 0.7.1",
+ "bitvec",
+ "byte-slice-cast",
+ "impl-trait-for-tuples",
+ "parity-scale-codec-derive",
+ "serde",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1557010476e0595c9b568d16dcfb81b93cdeb157612726f5170d31aa707bed27"
+dependencies = [
+ "proc-macro-crate 1.1.0",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "parking"
 version = "2.0.0"
@@ -4022,6 +4345,34 @@ version = "0.3.20"
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 checksum = "7c9b1041b4387893b91ee6746cddfc28516aff326a3519fb2adf820932c5e6cb"

+[[package]]
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+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]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d88417318da0eaf0fdcdb51a0ee6c3bed624333bff8f946733049380be67ac1c"
+
+[[package]]
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+checksum = "521fa9638fa597e1dc53e9412a4f9cefb01187ee1f7413076f9e6749e2885ba9"
+dependencies = [
+ "plotters-backend",
+]
+
 [[package]]
 name = "pmutil"
 version = "0.5.3"
@@ -4079,6 +4430,19 @@ dependencies = [
 "log",
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+[[package]]
+name = "primitive-types"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06345ee39fbccfb06ab45f3a1a5798d9dafa04cb8921a76d227040003a234b0e"
+dependencies = [
+ "fixed-hash",
+ "impl-codec",
+ "impl-rlp",
+ "impl-serde",
+ "uint",
+]
+
 [[package]]
 name = "proc-macro-crate"
 version = "0.1.5"
@@ -4249,6 +4613,12 @@ dependencies = [
 "scheduled-thread-pool",
 ]

+[[package]]
+name = "radium"
+version = "0.6.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "643f8f41a8ebc4c5dc4515c82bb8abd397b527fc20fd681b7c011c2aee5d44fb"
+
 [[package]]
 name = "rand"
 version = "0.6.5"
@@ -4549,6 +4919,12 @@ dependencies = [
 "regex-syntax",
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+[[package]]
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+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+
 [[package]]
 name = "regex-syntax"
 version = "0.6.25"
@@ -4648,6 +5024,16 @@ dependencies = [
 "opaque-debug 0.3.0",
 ]

+[[package]]
+name = "rlp"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "999508abb0ae792aabed2460c45b89106d97fe4adac593bdaef433c2605847b5"
+dependencies = [
+ "bytes",
+ "rustc-hex",
+]
+
 [[package]]
 name = "rocket"
 version = "0.5.0-rc.1"
@@ -4796,6 +5182,12 @@ dependencies = [
 "quote",
 ]

+[[package]]
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+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3e75f6a532d0fd9f7f13144f392b6ad56a32696bfcd9c78f797f16bbb6f072d6"
+
 [[package]]
 name = "rustc_version"
 version = "0.2.3"
@@ -4814,6 +5206,15 @@ 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"
@@ -4926,6 +5327,24 @@ dependencies = [
 "untrusted",
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+[[package]]
+name = "secp256k1"
+version = "0.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97d03ceae636d0fed5bae6a7f4f664354c5f4fcedf6eef053fef17e49f837d0a"
+dependencies = [
+ "secp256k1-sys",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "827cb7cce42533829c792fc51b82fbf18b125b45a702ef2c8be77fce65463a7b"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "security-framework"
 version = "2.4.2"
@@ -5035,6 +5454,16 @@ dependencies = [
 "serde",
 ]

+[[package]]
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+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"
@@ -5292,6 +5721,21 @@ dependencies = [
 "ordered-buffer",
 ]

+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4919971d141dbadaa0e82b5d369e2d7666c98e4625046140615ca363e50d4daa"
+dependencies = [
+ "base64",
+ "bytes",
+ "futures",
+ "httparse",
+ "log",
+ "rand 0.8.4",
+ "sha-1 0.9.8",
+]
+
 [[package]]
 name = "soup-sys"
 version = "0.10.0"
@@ -5891,6 +6335,12 @@ dependencies = [
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 ]

+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
+
 [[package]]
 name = "tar"
 version = "0.4.37"
@@ -6283,6 +6733,25 @@ dependencies = [
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+[[package]]
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+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c9d3793400a45f954c52e73d068316d76b6f4e36977e3fcebb13a2721e80237"
+dependencies = [
+ "crunchy",
+]
+
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+dependencies = [
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "tokio"
 version = "1.12.0"
@@ -6380,6 +6849,7 @@ checksum = "08d3725d3efa29485e87311c5b699de63cde14b00ed4d256b8318aa30ca452cd"
 dependencies = [
 "bytes",
 "futures-core",
+ "futures-io",
 "futures-sink",
 "log",
 "pin-project-lite",
@@ -6444,9 +6914,9 @@ checksum = "59547bce71d9c38b83d9c0e92b6066c4253371f15005def0c30d9657f50c7642"

 [[package]]
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-checksum = "369e48de67506679b3a576b0faf666fa9f9acf2fd00b4c61e28bdb6c8e08ec06"
+checksum = "f34750e8cbb4d87d09f6d7441921cc6d9435dcc58df53bbaec01f5f9945d4801"
 dependencies = [
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@@ -6454,9 +6924,9 @@ dependencies = [

 [[package]]
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-version = "3.1.0"
+version = "5.1.0"
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-checksum = "f269e8fd28e26b4cdbd01f81f345aaf666131511e54a735a76a614b5062d0a5a"
+checksum = "4c78e4905e64bb23c814098885e08778dfed7fd796ea503df29aa3ba5fead009"
 dependencies = [
 "Inflector",
 "proc-macro2",
@@ -6851,6 +7321,52 @@ dependencies = [
 "wasm-bindgen",
 ]

+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cd24abe6f2b68e0677f843059faea87bcbd4892e39f02886f366d8222c3c540d"
+dependencies = [
+ "arrayvec 0.5.2",
+ "base64",
+ "bytes",
+ "derive_more",
+ "ethabi",
+ "ethereum-types",
+ "futures",
+ "futures-timer",
+ "headers",
+ "hex",
+ "jsonrpc-core",
+ "log",
+ "parking_lot",
+ "pin-project",
+ "reqwest",
+ "rlp",
+ "secp256k1",
+ "serde",
+ "serde_json",
+ "soketto",
+ "tiny-keccak",
+ "tokio",
+ "tokio-stream",
+ "tokio-util",
+ "url",
+ "web3-async-native-tls",
+]
+
+[[package]]
+name = "web3-async-native-tls"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f6d8d1636b2627fe63518d5a9b38a569405d9c9bc665c43c9c341de57227ebb"
+dependencies = [
+ "native-tls",
+ "thiserror",
+ "tokio",
+ "url",
+]
+
 [[package]]
 name = "webkit2gtk"
 version = "0.14.0"
@@ -7061,6 +7577,12 @@ dependencies = [
 "winapi",
 ]

+[[package]]
+name = "wyz"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
+
 [[package]]
 name = "x11-dl"
 version = "2.19.1"
@@ -25,10 +25,12 @@ members = [
    "common/config",
    "common/credentials",
    "common/crypto",
+    "common/erc20-bridge-contract",
    "common/mixnet-contract",
    "common/mixnode-common",
    "common/network-defaults",
    "common/nonexhaustive-delayqueue",
+    "common/nymcoconut",
    "common/nymsphinx",
    "common/nymsphinx/acknowledgements",
    "common/nymsphinx/addressing",
@@ -62,4 +64,4 @@ default-members = [
    "validator-api",
 ]

-exclude = ["explorer", "contracts"]
+exclude = ["explorer", "contracts", "tokenomics-py"]
@@ -5,8 +5,6 @@ SPDX-License-Identifier: Apache-2.0

 ## The Nym Privacy Platform

-This repository contains the Nym mixnet.
-
 The platform is composed of multiple Rust crates. Top-level executable binary crates include:

 * nym-mixnode - shuffles [Sphinx](https://github.com/nymtech/sphinx) packets together to provide privacy against network-level attackers.
@@ -33,6 +31,45 @@ There's a `.env.sample-dev` file provided which you can rename to `.env` if you

 You can chat to us in [Keybase](https://keybase.io). Download their chat app, then click **Teams -> Join a team**. Type **nymtech.friends** into the team name and hit **continue**. For general chat, hang out in the **#general** channel. Our development takes places in the **#dev** channel. Node operators should be in the **#node-operators** channel.

+### Rewards
+
+Node, node operator and delegator rewards are determined according to the principles laid out in the section 6 of [Nym Whitepaper](https://nymtech.net/nym-whitepaper.pdf). Below is a TLDR of the variables and formulas involved in calculating the epoch rewards. Initial reward pool is set to 250 million Nym, making the circulating supply 750 million Nym.
+
+|Symbol|Definition|
+|---|---|
+|<img src="https://render.githubusercontent.com/render/math?math=R">|global share of rewards available, starts at 2% of the reward pool. 
+|<img src="https://render.githubusercontent.com/render/math?math=R_{i}">|node reward for mixnode `i`.
+|<img src="https://render.githubusercontent.com/render/math?math=\sigma_{i}">|ratio of total node stake (node bond + all delegations) to the token circulating supply.
+|<img src="https://render.githubusercontent.com/render/math?math=\lambda_{i}">|ratio of stake operator has plaged to their node to the token circulating supply.
+|<img src="https://render.githubusercontent.com/render/math?math=\omega_{i}">|fraction of total effort undertaken by node `i`, set to `1/k` in testnet Milhon.
+|<img src="https://render.githubusercontent.com/render/math?math=k">|number of nodes stakeholders are incentivised to create, set by the validators, a matter of governance. Currently determined by the `active set` size, and set to 5000 in testnet Milhon.
+|<img src="https://render.githubusercontent.com/render/math?math=\alpha">|Sybil attack resistance parameter - the higher this parameter is set the stronger the reduction in competitivness gets for a Sybil attacker.
+|<img src="https://render.githubusercontent.com/render/math?math=PM_{i}">|declared profit margin of operator `i`, defaults to 10% in testnet Milhon.
+|<img src="https://render.githubusercontent.com/render/math?math=PF_{i}">|uptime of node `i`, scaled to 0 - 1, for the rewarding epoch
+|<img src="https://render.githubusercontent.com/render/math?math=PP_{i}">|cost of operating node `i` for the duration of the rewarding eopoch, set to 40 Nym for testnet Milhon.
+
+Node reward for node `i` is determined as:
+
+<img src="https://render.githubusercontent.com/render/math?math=R_{i}=PF_{i} \cdot R \cdot (\sigma^'_{i} \cdot \omega_{i} \cdot k %2b \alpha \cdot \lambda^'_{i} \cdot \sigma^'_{i} \cdot k)/(1 %2b \alpha)">
+
+where:
+
+<img src="https://render.githubusercontent.com/render/math?math=\sigma^'_{i} = min\{\sigma_{i}, 1/k\}">
+
+and
+
+<img src="https://render.githubusercontent.com/render/math?math=\lambda^'_{i} = min\{\lambda_{i}, 1/k\}">
+
+Operator of node `i` is credited with the following amount:
+
+<img src="https://render.githubusercontent.com/render/math?math=min\{PP_{i},R_{i})\} %2b max\{0, (PM_{i} %2b (1 - PM_{i}) \cdot \lambda_{i}/\delta_{i}) \cdot (R_{i} - PP_{i})\}">
+
+Delegate with stake `s` recieves:
+
+<img src="https://render.githubusercontent.com/render/math?math=max\{0, (1-PM_{i}) \cdot (s^'/\sigma_{i}) \cdot (R_{i} - PP_{i})\}">
+
+where `s'` is stake `s` scaled over total token circulating supply.
+
 ### Licensing and copyright information

 This program is available as open source under the terms of the Apache 2.0 license. However, some elements are being licensed under CC0-1.0 and MIT. For accurate information, please check individual files.
@@ -30,3 +30,6 @@ validator-client = { path = "../../common/client-libs/validator-client" }

 [dev-dependencies]
 tempfile = "3.1.0"
+
+[features]
+coconut = []
@@ -22,7 +22,10 @@ const DEFAULT_MESSAGE_STREAM_AVERAGE_DELAY: Duration = Duration::from_millis(20)
 const DEFAULT_AVERAGE_PACKET_DELAY: Duration = Duration::from_millis(50);
 const DEFAULT_TOPOLOGY_REFRESH_RATE: Duration = Duration::from_secs(5 * 60); // every 5min
 const DEFAULT_TOPOLOGY_RESOLUTION_TIMEOUT: Duration = Duration::from_millis(5_000);
-const DEFAULT_GATEWAY_RESPONSE_TIMEOUT: Duration = Duration::from_millis(1_500);
+// Set this to a high value for now, so that we don't risk sporadic timeouts that might cause
+// bought bandwidth tokens to not have time to be spent; Once we remove the gateway from the
+// bandwidth bridging protocol, we can come back to a smaller timeout value
+const DEFAULT_GATEWAY_RESPONSE_TIMEOUT: Duration = Duration::from_secs(5 * 60);

 pub fn missing_string_value() -> String {
    MISSING_VALUE.to_string()
@@ -100,6 +103,17 @@ impl<T: NymConfig> Config<T> {
                self::Client::<T>::default_reply_encryption_key_store_path(&id);
        }

+        #[cfg(not(feature = "coconut"))]
+        if self
+            .client
+            .backup_bandwidth_token_keys_dir
+            .as_os_str()
+            .is_empty()
+        {
+            self.client.backup_bandwidth_token_keys_dir =
+                self::Client::<T>::default_backup_bandwidth_token_keys_dir(&id);
+        }
+
        self.client.id = id;
    }

@@ -111,6 +125,16 @@ impl<T: NymConfig> Config<T> {
        self.client.gateway_listener = gateway_listener.into();
    }

+    #[cfg(not(feature = "coconut"))]
+    pub fn with_eth_private_key<S: Into<String>>(&mut self, eth_private_key: S) {
+        self.client.eth_private_key = eth_private_key.into();
+    }
+
+    #[cfg(not(feature = "coconut"))]
+    pub fn with_eth_endpoint<S: Into<String>>(&mut self, eth_endpoint: S) {
+        self.client.eth_endpoint = eth_endpoint.into();
+    }
+
    pub fn set_custom_validator_apis(&mut self, validator_api_urls: Vec<Url>) {
        self.client.validator_api_urls = validator_api_urls;
    }
@@ -173,6 +197,21 @@ impl<T: NymConfig> Config<T> {
        self.client.gateway_listener.clone()
    }

+    #[cfg(not(feature = "coconut"))]
+    pub fn get_backup_bandwidth_token_keys_dir(&self) -> PathBuf {
+        self.client.backup_bandwidth_token_keys_dir.clone()
+    }
+
+    #[cfg(not(feature = "coconut"))]
+    pub fn get_eth_endpoint(&self) -> String {
+        self.client.eth_endpoint.clone()
+    }
+
+    #[cfg(not(feature = "coconut"))]
+    pub fn get_eth_private_key(&self) -> String {
+        self.client.eth_private_key.clone()
+    }
+
    // Debug getters
    pub fn get_average_packet_delay(&self) -> Duration {
        self.debug.average_packet_delay
@@ -268,6 +307,20 @@ pub struct Client<T> {
    /// Address of the gateway listener to which all client requests should be sent.
    gateway_listener: String,

+    /// Path to directory containing public/private keys used for bandwidth token purchase.
+    /// Those are saved in case of emergency, to be able to reclaim bandwidth tokens.
+    /// The public key is the name of the file, while the private key is the content.
+    #[cfg(not(feature = "coconut"))]
+    backup_bandwidth_token_keys_dir: PathBuf,
+
+    /// Ethereum private key.
+    #[cfg(not(feature = "coconut"))]
+    eth_private_key: String,
+
+    /// Address to an Ethereum full node.
+    #[cfg(not(feature = "coconut"))]
+    eth_endpoint: String,
+
    /// nym_home_directory specifies absolute path to the home nym Clients directory.
    /// It is expected to use default value and hence .toml file should not redefine this field.
    nym_root_directory: PathBuf,
@@ -292,6 +345,12 @@ impl<T: NymConfig> Default for Client<T> {
            reply_encryption_key_store_path: Default::default(),
            gateway_id: "".to_string(),
            gateway_listener: "".to_string(),
+            #[cfg(not(feature = "coconut"))]
+            backup_bandwidth_token_keys_dir: Default::default(),
+            #[cfg(not(feature = "coconut"))]
+            eth_private_key: "".to_string(),
+            #[cfg(not(feature = "coconut"))]
+            eth_endpoint: "".to_string(),
            nym_root_directory: T::default_root_directory(),
            super_struct: Default::default(),
        }
@@ -326,6 +385,11 @@ impl<T: NymConfig> Client<T> {
    fn default_reply_encryption_key_store_path(id: &str) -> PathBuf {
        T::default_data_directory(Some(id)).join("reply_key_store")
    }
+
+    #[cfg(not(feature = "coconut"))]
+    fn default_backup_bandwidth_token_keys_dir(id: &str) -> PathBuf {
+        T::default_data_directory(Some(id)).join("backup_bandwidth_token_keys")
+    }
 }

 #[derive(Debug, Default, Deserialize, PartialEq, Serialize)]
@@ -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"]
@@ -42,6 +42,17 @@ public_encryption_key_file = '{{ client.public_encryption_key_file }}'
 # sent but not received back.
 reply_encryption_key_store_path = '{{ client.reply_encryption_key_store_path }}'

+# Path to directory containing public/private keys used for bandwidth token purchase.
+# Those are saved in case of emergency, to be able to reclaim bandwidth tokens.
+# The public key is the name of the file, while the private key is the content.
+backup_bandwidth_token_keys_dir = '{{ client.backup_bandwidth_token_keys_dir }}'
+
+# Ethereum private key.
+eth_private_key = '{{ client.eth_private_key }}'
+
+# Addess to an Ethereum full node.
+eth_endpoint = '{{ client.eth_endpoint }}'
+
 ##### additional client config options #####

 # ID of the gateway from which the client should be fetching messages.
@@ -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,
@@ -35,10 +34,8 @@ use nymsphinx::anonymous_replies::ReplySurb;
 use nymsphinx::receiver::ReconstructedMessage;
 use tokio::runtime::Runtime;

-#[cfg(feature = "coconut")]
-use coconut_interface::Credential;
-#[cfg(feature = "coconut")]
-use credentials::{bandwidth::prepare_for_spending, obtain_aggregate_verification_key};
+use crate::client::config::{Config, SocketType};
+use crate::websocket;

 pub(crate) mod config;

@@ -168,31 +165,6 @@ impl NymClient {
        .start(self.runtime.handle())
    }

-    #[cfg(feature = "coconut")]
-    async fn prepare_coconut_credential(&self) -> Credential {
-        let verification_key = obtain_aggregate_verification_key(
-            &self.config.get_base().get_validator_api_endpoints(),
-        )
-        .await
-        .expect("could not obtain aggregate verification key of validators");
-
-        let bandwidth_credential = credentials::bandwidth::obtain_signature(
-            &self.key_manager.identity_keypair().public_key().to_bytes(),
-            &self.config.get_base().get_validator_api_endpoints(),
-        )
-        .await
-        .expect("could not obtain bandwidth credential");
-        // 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)
-        prepare_for_spending(
-            &self.key_manager.identity_keypair().public_key().to_bytes(),
-            &bandwidth_credential,
-            &verification_key,
-        )
-        .expect("could not prepare out bandwidth credential for spending")
-    }
-
    fn start_gateway_client(
        &mut self,
        mixnet_message_sender: MixnetMessageSender,
@@ -212,7 +184,17 @@ impl NymClient {

        self.runtime.block_on(async {
            #[cfg(feature = "coconut")]
-            let coconut_credential = self.prepare_coconut_credential().await;
+            let bandwidth_controller = BandwidthController::new(
+                self.config.get_base().get_validator_api_endpoints(),
+                *self.key_manager.identity_keypair().public_key(),
+            );
+            #[cfg(not(feature = "coconut"))]
+            let bandwidth_controller = BandwidthController::new(
+                self.config.get_base().get_eth_endpoint(),
+                self.config.get_base().get_eth_private_key(),
+                self.config.get_base().get_backup_bandwidth_token_keys_dir(),
+            )
+            .expect("Could not create bandwidth controller");

            let mut gateway_client = GatewayClient::new(
                gateway_address,
@@ -222,13 +204,11 @@ impl NymClient {
                mixnet_message_sender,
                ack_sender,
                self.config.get_base().get_gateway_response_timeout(),
+                Some(bandwidth_controller),
            );

            gateway_client
-                .authenticate_and_start(
-                    #[cfg(feature = "coconut")]
-                    Some(coconut_credential),
-                )
+                .authenticate_and_start()
                .await
                .expect("could not authenticate and start up the gateway connection");

@@ -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;
@@ -21,8 +29,11 @@ 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> {
-    App::new("init")
+    let app = App::new("init")
        .about("Initialise a Nym client. Do this first!")
        .arg(Arg::with_name("id")
            .long("id")
@@ -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")
@@ -54,7 +65,51 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
            .long("fastmode")
            .hidden(true) // this will prevent this flag from being displayed in `--help`
            .help("Mostly debug-related option to increase default traffic rate so that you would not need to modify config post init")
-        )
+        );
+    #[cfg(not(feature = "coconut"))]
+        let app = app
+        .arg(Arg::with_name("eth_endpoint")
+            .long("eth_endpoint")
+            .help("URL of an Ethereum full node that we want to use for getting bandwidth tokens from ERC20 tokens")
+            .takes_value(true)
+            .required(true))
+        .arg(Arg::with_name("eth_private_key")
+            .long("eth_private_key")
+            .help("Ethereum private key used for obtaining bandwidth tokens from ERC20 tokens")
+            .takes_value(true)
+            .required(true));
+
+    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(
@@ -43,5 +43,14 @@ pub(crate) fn override_config(mut config: Config, matches: &ArgMatches) -> Confi
        config = config.with_port(port.unwrap());
    }

+    #[cfg(not(feature = "coconut"))]
+    if let Some(eth_endpoint) = matches.value_of("eth_endpoint") {
+        config.get_base_mut().with_eth_endpoint(eth_endpoint);
+    }
+    #[cfg(not(feature = "coconut"))]
+    if let Some(eth_private_key) = matches.value_of("eth_private_key") {
+        config.get_base_mut().with_eth_private_key(eth_private_key);
+    }
+
    config
 }
@@ -10,7 +10,7 @@ use log::*;
 use version_checker::is_minor_version_compatible;

 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
-    App::new("run")
+    let app = App::new("run")
        .about("Run the Nym client with provided configuration client optionally overriding set parameters")
        .arg(Arg::with_name("id")
            .long("id")
@@ -38,7 +38,19 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
            .long("port")
            .help("Port for the socket (if applicable) to listen on")
            .takes_value(true)
-        )
+        );
+    #[cfg(not(feature = "coconut"))]
+        let app = app
+        .arg(Arg::with_name("eth_endpoint")
+            .long("eth_endpoint")
+            .help("URL of an Ethereum full node that we want to use for getting bandwidth tokens from ERC20 tokens")
+            .takes_value(true))
+        .arg(Arg::with_name("eth_private_key")
+            .long("eth_private_key")
+            .help("Ethereum private key used for obtaining bandwidth tokens from ERC20 tokens")
+            .takes_value(true));
+
+    app
 }

 // this only checks compatibility between config the binary. It does not take into consideration
@@ -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"]
@@ -42,6 +42,17 @@ public_encryption_key_file = '{{ client.public_encryption_key_file }}'
 # sent but not received back.
 reply_encryption_key_store_path = '{{ client.reply_encryption_key_store_path }}'

+# Path to directory containing public/private keys used for bandwidth token purchase.
+# Those are saved in case of emergency, to be able to reclaim bandwidth tokens.
+# The public key is the name of the file, while the private key is the content.
+backup_bandwidth_token_keys_dir = '{{ client.backup_bandwidth_token_keys_dir }}'
+
+# Ethereum private key.
+eth_private_key = '{{ client.eth_private_key }}'
+
+# Addess to an Ethereum full node.
+eth_endpoint = '{{ client.eth_endpoint }}'
+
 ##### additional client config options #####

 # ID of the gateway from which the client should be fetching messages.
@@ -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,
@@ -34,10 +30,11 @@ use nymsphinx::addressing::clients::Recipient;
 use nymsphinx::addressing::nodes::NodeIdentity;
 use tokio::runtime::Runtime;

-#[cfg(feature = "coconut")]
-use coconut_interface::Credential;
-#[cfg(feature = "coconut")]
-use credentials::{bandwidth::prepare_for_spending, obtain_aggregate_verification_key};
+use crate::client::config::Config;
+use crate::socks::{
+    authentication::{AuthenticationMethods, Authenticator, User},
+    server::SphinxSocksServer,
+};

 pub(crate) mod config;

@@ -156,31 +153,6 @@ impl NymClient {
        .start(self.runtime.handle())
    }

-    #[cfg(feature = "coconut")]
-    async fn prepare_coconut_credential(&self) -> Credential {
-        let verification_key = obtain_aggregate_verification_key(
-            &self.config.get_base().get_validator_api_endpoints(),
-        )
-        .await
-        .expect("could not obtain aggregate verification key of validators");
-
-        let bandwidth_credential = credentials::bandwidth::obtain_signature(
-            &self.key_manager.identity_keypair().public_key().to_bytes(),
-            &self.config.get_base().get_validator_api_endpoints(),
-        )
-        .await
-        .expect("could not obtain bandwidth credential");
-        // 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)
-        prepare_for_spending(
-            &self.key_manager.identity_keypair().public_key().to_bytes(),
-            &bandwidth_credential,
-            &verification_key,
-        )
-        .expect("could not prepare out bandwidth credential for spending")
-    }
-
    fn start_gateway_client(
        &mut self,
        mixnet_message_sender: MixnetMessageSender,
@@ -200,7 +172,17 @@ impl NymClient {

        self.runtime.block_on(async {
            #[cfg(feature = "coconut")]
-            let coconut_credential = self.prepare_coconut_credential().await;
+            let bandwidth_controller = BandwidthController::new(
+                self.config.get_base().get_validator_api_endpoints(),
+                *self.key_manager.identity_keypair().public_key(),
+            );
+            #[cfg(not(feature = "coconut"))]
+            let bandwidth_controller = BandwidthController::new(
+                self.config.get_base().get_eth_endpoint(),
+                self.config.get_base().get_eth_private_key(),
+                self.config.get_base().get_backup_bandwidth_token_keys_dir(),
+            )
+            .expect("Could not create bandwidth controller");

            let mut gateway_client = GatewayClient::new(
                gateway_address,
@@ -210,13 +192,11 @@ impl NymClient {
                mixnet_message_sender,
                ack_sender,
                self.config.get_base().get_gateway_response_timeout(),
+                Some(bandwidth_controller),
            );

            gateway_client
-                .authenticate_and_start(
-                    #[cfg(feature = "coconut")]
-                    Some(coconut_credential),
-                )
+                .authenticate_and_start()
                .await
                .expect("could not authenticate and start up the gateway connection");

@@ -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};
@@ -19,8 +27,11 @@ 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> {
-    App::new("init")
+    let app = App::new("init")
        .about("Initialise a Nym client. Do this first!")
        .arg(Arg::with_name("id")
            .long("id")
@@ -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")
@@ -54,7 +65,51 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
            .long("fastmode")
            .hidden(true) // this will prevent this flag from being displayed in `--help`
            .help("Mostly debug-related option to increase default traffic rate so that you would not need to modify config post init")
-        )
+        );
+    #[cfg(not(feature = "coconut"))]
+        let app = app
+        .arg(Arg::with_name("eth_endpoint")
+            .long("eth_endpoint")
+            .help("URL of an Ethereum full node that we want to use for getting bandwidth tokens from ERC20 tokens")
+            .takes_value(true)
+            .required(true))
+        .arg(Arg::with_name("eth_private_key")
+            .long("eth_private_key")
+            .help("Ethereum private key used for obtaining bandwidth tokens from ERC20 tokens")
+            .takes_value(true)
+            .required(true));
+
+    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(
@@ -39,5 +39,14 @@ pub(crate) fn override_config(mut config: Config, matches: &ArgMatches) -> Confi
        config = config.with_port(port.unwrap());
    }

+    #[cfg(not(feature = "coconut"))]
+    if let Some(eth_endpoint) = matches.value_of("eth_endpoint") {
+        config.get_base_mut().with_eth_endpoint(eth_endpoint);
+    }
+    #[cfg(not(feature = "coconut"))]
+    if let Some(eth_private_key) = matches.value_of("eth_private_key") {
+        config.get_base_mut().with_eth_private_key(eth_private_key);
+    }
+
    config
 }
@@ -10,7 +10,7 @@ use log::*;
 use version_checker::is_minor_version_compatible;

 pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
-    App::new("run")
+    let app = App::new("run")
        .about("Run the Nym client with provided configuration client optionally overriding set parameters")
        .arg(Arg::with_name("id")
            .long("id")
@@ -44,7 +44,19 @@ pub fn command_args<'a, 'b>() -> clap::App<'a, 'b> {
            .long("port")
            .help("Port for the socket to listen on")
            .takes_value(true)
-        )
+        );
+    #[cfg(not(feature = "coconut"))]
+    let app = app
+        .arg(Arg::with_name("eth_endpoint")
+            .long("eth_endpoint")
+            .help("URL of an Ethereum full node that we want to use for getting bandwidth tokens from ERC20 tokens")
+            .takes_value(true))
+        .arg(Arg::with_name("eth_private_key")
+            .long("eth_private_key")
+            .help("Ethereum private key used for obtaining bandwidth tokens from ERC20 tokens")
+            .takes_value(true));
+
+    app
 }

 // this only checks compatibility between config the binary. It does not take into consideration
@@ -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
@@ -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;
@@ -17,11 +18,6 @@ use wasm_bindgen::prelude::*;
 use wasm_bindgen_futures::spawn_local;
 use wasm_utils::{console_log, console_warn};

-#[cfg(feature = "coconut")]
-use coconut_interface::Credential;
-#[cfg(feature = "coconut")]
-use credentials::{bandwidth::prepare_for_spending, obtain_aggregate_verification_key};
-
 pub(crate) mod received_processor;

 const DEFAULT_AVERAGE_PACKET_DELAY: Duration = Duration::from_millis(200);
@@ -103,35 +99,15 @@ impl NymClient {
        self.self_recipient().to_string()
    }

-    #[cfg(feature = "coconut")]
-    async fn prepare_coconut_credential(validators: &[Url], identity_bytes: &[u8]) -> Credential {
-        let verification_key = obtain_aggregate_verification_key(validators)
-            .await
-            .expect("could not obtain aggregate verification key of validators");
-
-        let bandwidth_credential =
-            credentials::bandwidth::obtain_signature(identity_bytes, validators)
-                .await
-                .expect("could not obtain bandwidth credential");
-        // 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)
-        prepare_for_spending(identity_bytes, &bandwidth_credential, &verification_key)
-            .expect("could not prepare out bandwidth credential for spending")
-    }
-
    // Right now it's impossible to have async exported functions to take `&self` rather than self
    pub async fn initial_setup(self) -> Self {
        #[cfg(feature = "coconut")]
-        let coconut_credential = {
-            let validator_server = self.validator_server.clone();
-            let identity_public_key = self.identity.public_key().clone();
-            Self::prepare_coconut_credential(
-                &vec![validator_server],
-                &identity_public_key.to_bytes(),
-            )
-            .await
-        };
+        let bandwidth_controller = Some(BandwidthController::new(
+            vec![self.validator_server.clone()],
+            *self.identity.public_key(),
+        ));
+        #[cfg(not(feature = "coconut"))]
+        let bandwidth_controller = None;

        let mut client = self.get_and_update_topology().await;
        let gateway = client.choose_gateway();
@@ -147,13 +123,11 @@ impl NymClient {
            mixnet_messages_sender,
            ack_sender,
            DEFAULT_GATEWAY_RESPONSE_TIMEOUT,
+            bandwidth_controller,
        );

        gateway_client
-            .authenticate_and_start(
-                #[cfg(feature = "coconut")]
-                Some(coconut_credential),
-            )
+            .authenticate_and_start()
            .await
            .expect("could not authenticate and start up the gateway connection");

@@ -275,7 +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,
        };

@@ -10,14 +10,19 @@ edition = "2018"
 # TODO: (for this and other crates), similarly to 'tokio', import only required "futures" modules rather than
 # the entire crate
 futures = "0.3"
+json = "0.12.4"
 log = "0.4"
+thiserror = "1.0"
+url = "2.2"
 rand = { version = "0.7.3", features = ["wasm-bindgen"] }

 # internal
+credentials = { path = "../../credentials" }
 crypto = { path = "../../crypto" }
 gateway-requests = { path = "../../../gateway/gateway-requests" }
 nymsphinx = { path = "../../nymsphinx" }
 coconut-interface = { path = "../../coconut-interface", optional = true }
+network-defaults = { path = "../../network-defaults" }

 [dependencies.tungstenite]
 version = "0.13"
@@ -31,6 +36,12 @@ features = ["macros", "rt", "net", "sync", "time"]
 [target."cfg(not(target_arch = \"wasm32\"))".dependencies.tokio-tungstenite]
 version = "0.14"

+[target."cfg(not(target_arch = \"wasm32\"))".dependencies.secp256k1]
+version = "0.20.3"
+
+[target."cfg(not(target_arch = \"wasm32\"))".dependencies.web3]
+version = "0.17.0"
+
 # wasm-only dependencies
 [target."cfg(target_arch = \"wasm32\")".dependencies.wasm-bindgen]
 version = "0.2"
@@ -0,0 +1,247 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+#[cfg(feature = "coconut")]
+use credentials::coconut::{
+    bandwidth::{
+        obtain_signature, prepare_for_spending, BandwidthVoucherAttributes, TOTAL_ATTRIBUTES,
+    },
+    utils::obtain_aggregate_verification_key,
+};
+#[cfg(not(feature = "coconut"))]
+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, ETH_BURN_FUNCTION_NAME, ETH_CONTRACT_ADDRESS, ETH_MIN_BLOCK_DEPTH,
+    TOKENS_TO_BURN,
+};
+#[cfg(not(feature = "coconut"))]
+use rand::rngs::OsRng;
+#[cfg(not(feature = "coconut"))]
+use secp256k1::SecretKey;
+#[cfg(not(feature = "coconut"))]
+use std::io::Write;
+#[cfg(not(feature = "coconut"))]
+use std::str::FromStr;
+#[cfg(not(feature = "coconut"))]
+use web3::{
+    contract::{Contract, Options},
+    transports::Http,
+    types::{Address, Bytes, U256, U64},
+    Web3,
+};
+
+use crate::error::GatewayClientError;
+
+#[cfg(not(feature = "coconut"))]
+pub fn eth_contract(web3: Web3<Http>) -> Contract<Http> {
+    Contract::from_json(
+        web3.eth(),
+        Address::from(ETH_CONTRACT_ADDRESS),
+        json::parse(ETH_JSON_ABI)
+            .expect("Invalid json abi")
+            .dump()
+            .as_bytes(),
+    )
+    .expect("Invalid json abi")
+}
+
+#[derive(Clone)]
+pub struct BandwidthController {
+    #[cfg(feature = "coconut")]
+    validator_endpoints: Vec<url::Url>,
+    #[cfg(feature = "coconut")]
+    identity: PublicKey,
+    #[cfg(not(feature = "coconut"))]
+    contract: Contract<Http>,
+    #[cfg(not(feature = "coconut"))]
+    eth_private_key: SecretKey,
+    #[cfg(not(feature = "coconut"))]
+    backup_bandwidth_token_keys_dir: std::path::PathBuf,
+}
+
+impl BandwidthController {
+    #[cfg(feature = "coconut")]
+    pub fn new(validator_endpoints: Vec<url::Url>, identity: PublicKey) -> Self {
+        BandwidthController {
+            validator_endpoints,
+            identity,
+        }
+    }
+
+    #[cfg(not(feature = "coconut"))]
+    pub fn new(
+        eth_endpoint: String,
+        eth_private_key: String,
+        backup_bandwidth_token_keys_dir: std::path::PathBuf,
+    ) -> Result<Self, GatewayClientError> {
+        // Fail early, on invalid url
+        let transport =
+            Http::new(&eth_endpoint).map_err(|_| GatewayClientError::InvalidURL(eth_endpoint))?;
+        let web3 = web3::Web3::new(transport);
+        // Fail early, on invalid abi
+        let contract = eth_contract(web3);
+        let eth_private_key = secp256k1::SecretKey::from_str(&eth_private_key)
+            .map_err(|_| GatewayClientError::InvalidEthereumPrivateKey)?;
+
+        Ok(BandwidthController {
+            contract,
+            eth_private_key,
+            backup_bandwidth_token_keys_dir,
+        })
+    }
+
+    #[cfg(not(feature = "coconut"))]
+    fn backup_keypair(&self, keypair: &identity::KeyPair) -> Result<(), GatewayClientError> {
+        std::fs::create_dir_all(&self.backup_bandwidth_token_keys_dir)?;
+        let file_path = self
+            .backup_bandwidth_token_keys_dir
+            .join(keypair.public_key().to_base58_string());
+        let mut file = std::fs::File::create(file_path)?;
+        file.write_all(&keypair.private_key().to_bytes())?;
+
+        Ok(())
+    }
+
+    #[cfg(feature = "coconut")]
+    pub async fn prepare_coconut_credential(
+        &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();
+
+        // 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,
+        )?)
+    }
+
+    #[cfg(not(feature = "coconut"))]
+    pub async fn prepare_token_credential(
+        &self,
+        gateway_identity: PublicKey,
+    ) -> Result<TokenCredential, GatewayClientError> {
+        let mut rng = OsRng;
+
+        let kp = identity::KeyPair::new(&mut rng);
+        self.backup_keypair(&kp)?;
+
+        let verification_key = *kp.public_key();
+        let signed_verification_key = kp.private_key().sign(&verification_key.to_bytes());
+        self.buy_token_credential(verification_key, signed_verification_key)
+            .await?;
+
+        let message: Vec<u8> = verification_key
+            .to_bytes()
+            .iter()
+            .chain(gateway_identity.to_bytes().iter())
+            .copied()
+            .collect();
+        let signature = kp.private_key().sign(&message);
+
+        Ok(TokenCredential::new(
+            verification_key,
+            gateway_identity,
+            BANDWIDTH_VALUE,
+            signature,
+        ))
+    }
+
+    #[cfg(not(feature = "coconut"))]
+    pub async fn buy_token_credential(
+        &self,
+        verification_key: PublicKey,
+        signed_verification_key: identity::Signature,
+    ) -> Result<(), GatewayClientError> {
+        // 0 means a transaction failure, 1 means success
+        let confirmations = if cfg!(debug_assertions) {
+            1
+        } else {
+            ETH_MIN_BLOCK_DEPTH
+        };
+        // 15 seconds per confirmation block + 10 seconds of network overhead
+        log::info!(
+            "Waiting for Ethereum transaction. This should take about {} seconds",
+            confirmations * 15 + 10
+        );
+        let recipt = self
+            .contract
+            .signed_call_with_confirmations(
+                ETH_BURN_FUNCTION_NAME,
+                (
+                    U256::from(TOKENS_TO_BURN),
+                    U256::from(&verification_key.to_bytes()),
+                    Bytes(signed_verification_key.to_bytes().to_vec()),
+                ),
+                Options::default(),
+                confirmations,
+                &self.eth_private_key,
+            )
+            .await?;
+        if Some(U64::from(0)) == recipt.status {
+            Err(GatewayClientError::BurnTokenError(
+                web3::Error::InvalidResponse(format!(
+                    "Transaction status is 0 (failure): {:?}",
+                    recipt.logs,
+                )),
+            ))
+        } else {
+            log::info!(
+                "Bought bandwidth on Ethereum: {} MB",
+                BANDWIDTH_VALUE / 1024 / 1024
+            );
+            Ok(())
+        }
+    }
+}
+
+#[cfg(not(feature = "coconut"))]
+#[cfg(test)]
+mod tests {
+    use network_defaults::ETH_EVENT_NAME;
+
+    use super::*;
+
+    #[test]
+    fn parse_contract() {
+        let transport =
+            Http::new("https://rinkeby.infura.io/v3/00000000000000000000000000000000").unwrap();
+        let web3 = web3::Web3::new(transport);
+        // test no panic occurs
+        eth_contract(web3);
+    }
+
+    #[test]
+    fn check_event_name_constant_against_abi() {
+        let transport =
+            Http::new("https://rinkeby.infura.io/v3/00000000000000000000000000000000").unwrap();
+        let web3 = web3::Web3::new(transport);
+        let contract = eth_contract(web3);
+        assert!(contract.abi().event(ETH_EVENT_NAME).is_ok());
+    }
+}
@@ -1,6 +1,7 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

+use crate::bandwidth::BandwidthController;
 use crate::cleanup_socket_message;
 use crate::error::GatewayClientError;
 use crate::packet_router::PacketRouter;
@@ -8,6 +9,10 @@ pub use crate::packet_router::{
    AcknowledgementReceiver, AcknowledgementSender, MixnetMessageReceiver, MixnetMessageSender,
 };
 use crate::socket_state::{PartiallyDelegated, SocketState};
+#[cfg(feature = "coconut")]
+use coconut_interface::Credential;
+#[cfg(not(feature = "coconut"))]
+use credentials::token::bandwidth::TokenCredential;
 use crypto::asymmetric::identity;
 use futures::{FutureExt, SinkExt, StreamExt};
 use gateway_requests::authentication::encrypted_address::EncryptedAddressBytes;
@@ -30,15 +35,11 @@ use fluvio_wasm_timer as wasm_timer;
 #[cfg(target_arch = "wasm32")]
 use wasm_utils::websocket::JSWebsocket;

-#[cfg(feature = "coconut")]
-use coconut_interface::Credential;
-
 const DEFAULT_RECONNECTION_ATTEMPTS: usize = 10;
 const DEFAULT_RECONNECTION_BACKOFF: Duration = Duration::from_secs(5);

 pub struct GatewayClient {
    authenticated: bool,
-    #[cfg(feature = "coconut")]
    bandwidth_remaining: i64,
    gateway_address: String,
    gateway_identity: identity::PublicKey,
@@ -47,6 +48,7 @@ pub struct GatewayClient {
    connection: SocketState,
    packet_router: PacketRouter,
    response_timeout_duration: Duration,
+    bandwidth_controller: Option<BandwidthController>,

    // reconnection related variables
    /// Specifies whether client should try to reconnect to gateway on connection failure.
@@ -69,20 +71,19 @@ impl GatewayClient {
        mixnet_message_sender: MixnetMessageSender,
        ack_sender: AcknowledgementSender,
        response_timeout_duration: Duration,
+        bandwidth_controller: Option<BandwidthController>,
    ) -> Self {
        GatewayClient {
            authenticated: false,
-
-            #[cfg(feature = "coconut")]
            bandwidth_remaining: 0,
            gateway_address,
-
            gateway_identity,
            local_identity,
            shared_key,
            connection: SocketState::NotConnected,
            packet_router: PacketRouter::new(ack_sender, mixnet_message_sender),
            response_timeout_duration,
+            bandwidth_controller,
            should_reconnect_on_failure: true,
            reconnection_attempts: DEFAULT_RECONNECTION_ATTEMPTS,
            reconnection_backoff: DEFAULT_RECONNECTION_BACKOFF,
@@ -118,10 +119,7 @@ impl GatewayClient {

        GatewayClient {
            authenticated: false,
-
-            #[cfg(feature = "coconut")]
            bandwidth_remaining: 0,
-
            gateway_address,
            gateway_identity,
            local_identity,
@@ -129,6 +127,7 @@ impl GatewayClient {
            connection: SocketState::NotConnected,
            packet_router,
            response_timeout_duration,
+            bandwidth_controller: None,
            should_reconnect_on_failure: false,
            reconnection_attempts: DEFAULT_RECONNECTION_ATTEMPTS,
            reconnection_backoff: DEFAULT_RECONNECTION_BACKOFF,
@@ -139,7 +138,6 @@ impl GatewayClient {
        self.gateway_identity
    }

-    #[cfg(feature = "coconut")]
    pub fn remaining_bandwidth(&self) -> i64 {
        self.bandwidth_remaining
    }
@@ -208,14 +206,7 @@ impl GatewayClient {

        for i in 1..self.reconnection_attempts {
            info!("attempt {}...", i);
-            if self
-                .authenticate_and_start(
-                    #[cfg(feature = "coconut")]
-                    None,
-                )
-                .await
-                .is_ok()
-            {
+            if self.authenticate_and_start().await.is_ok() {
                info!("managed to reconnect!");
                return Ok(());
            }
@@ -234,13 +225,7 @@ impl GatewayClient {

        // final attempt (done separately to be able to return a proper error)
        info!("attempt {}", self.reconnection_attempts);
-        match self
-            .authenticate_and_start(
-                #[cfg(feature = "coconut")]
-                None,
-            )
-            .await
-        {
+        match self.authenticate_and_start().await {
            Ok(_) => {
                info!("managed to reconnect!");
                Ok(())
@@ -451,8 +436,12 @@ impl GatewayClient {
            ClientControlRequest::new_authenticate(self_address, encrypted_address, iv).into();

        match self.send_websocket_message(msg).await? {
-            ServerResponse::Authenticate { status } => {
+            ServerResponse::Authenticate {
+                status,
+                bandwidth_remaining,
+            } => {
                self.authenticated = status;
+                self.bandwidth_remaining = bandwidth_remaining;
                Ok(())
            }
            ServerResponse::Error { message } => Err(GatewayClientError::GatewayError(message)),
@@ -478,22 +467,15 @@ impl GatewayClient {
    }

    #[cfg(feature = "coconut")]
-    pub async fn claim_coconut_bandwidth(
+    async fn claim_coconut_bandwidth(
        &mut self,
-        coconut_credential: Credential,
+        credential: Credential,
    ) -> Result<(), GatewayClientError> {
-        if !self.authenticated {
-            return Err(GatewayClientError::NotAuthenticated);
-        }
-        if self.shared_key.is_none() {
-            return Err(GatewayClientError::NoSharedKeyAvailable);
-        }
-
        let mut rng = OsRng;
        let iv = IV::new_random(&mut rng);

        let msg = ClientControlRequest::new_enc_coconut_bandwidth_credential(
-            &coconut_credential,
+            &credential,
            self.shared_key.as_ref().unwrap(),
            iv,
        )
@@ -507,7 +489,64 @@ impl GatewayClient {
        Ok(())
    }

-    #[cfg(feature = "coconut")]
+    #[cfg(not(feature = "coconut"))]
+    async fn claim_token_bandwidth(
+        &mut self,
+        credential: TokenCredential,
+    ) -> Result<(), GatewayClientError> {
+        let mut rng = OsRng;
+
+        let iv = IV::new_random(&mut rng);
+
+        let msg = ClientControlRequest::new_enc_token_bandwidth_credential(
+            &credential,
+            self.shared_key.as_ref().unwrap(),
+            iv,
+        )
+        .into();
+        self.bandwidth_remaining = match self.send_websocket_message(msg).await? {
+            ServerResponse::Bandwidth { available_total } => Ok(available_total),
+            ServerResponse::Error { message } => Err(GatewayClientError::GatewayError(message)),
+            _ => Err(GatewayClientError::UnexpectedResponse),
+        }?;
+
+        Ok(())
+    }
+
+    pub async fn claim_bandwidth(&mut self) -> Result<(), GatewayClientError> {
+        if !self.authenticated {
+            return Err(GatewayClientError::NotAuthenticated);
+        }
+        if self.shared_key.is_none() {
+            return Err(GatewayClientError::NoSharedKeyAvailable);
+        }
+        if self.bandwidth_controller.is_none() {
+            return Err(GatewayClientError::NoBandwidthControllerAvailable);
+        }
+
+        warn!("Not enough bandwidth. Trying to get more bandwidth, this might take a while");
+
+        #[cfg(feature = "coconut")]
+        let credential = self
+            .bandwidth_controller
+            .as_ref()
+            .unwrap()
+            .prepare_coconut_credential()
+            .await?;
+        #[cfg(not(feature = "coconut"))]
+        let credential = self
+            .bandwidth_controller
+            .as_ref()
+            .unwrap()
+            .prepare_token_credential(self.gateway_identity)
+            .await?;
+
+        #[cfg(feature = "coconut")]
+        return self.claim_coconut_bandwidth(credential).await;
+        #[cfg(not(feature = "coconut"))]
+        return self.claim_token_bandwidth(credential).await;
+    }
+
    fn estimate_required_bandwidth(&self, packets: &[MixPacket]) -> i64 {
        packets
            .iter()
@@ -522,9 +561,16 @@ impl GatewayClient {
        if !self.authenticated {
            return Err(GatewayClientError::NotAuthenticated);
        }
-        #[cfg(feature = "coconut")]
-        if self.estimate_required_bandwidth(&packets) < self.bandwidth_remaining {
-            return Err(GatewayClientError::NotEnoughBandwidth);
+        if self.estimate_required_bandwidth(&packets) > self.bandwidth_remaining {
+            // Try to claim more bandwidth first, and return an error only if that is still not
+            // enough (the current granularity for bandwidth should be sufficient)
+            self.claim_bandwidth().await?;
+            if self.estimate_required_bandwidth(&packets) > self.bandwidth_remaining {
+                return Err(GatewayClientError::NotEnoughBandwidth(
+                    self.estimate_required_bandwidth(&packets),
+                    self.bandwidth_remaining,
+                ));
+            }
        }
        if !self.connection.is_established() {
            return Err(GatewayClientError::ConnectionNotEstablished);
@@ -590,9 +636,16 @@ impl GatewayClient {
        if !self.authenticated {
            return Err(GatewayClientError::NotAuthenticated);
        }
-        #[cfg(feature = "coconut")]
        if (mix_packet.sphinx_packet().len() as i64) > self.bandwidth_remaining {
-            return Err(GatewayClientError::NotEnoughBandwidth);
+            // Try to claim more bandwidth first, and return an error only if that is still not
+            // enough
+            self.claim_bandwidth().await?;
+            if (mix_packet.sphinx_packet().len() as i64) > self.bandwidth_remaining {
+                return Err(GatewayClientError::NotEnoughBandwidth(
+                    mix_packet.sphinx_packet().len() as i64,
+                    self.bandwidth_remaining,
+                ));
+            }
        }
        if !self.connection.is_established() {
            return Err(GatewayClientError::ConnectionNotEstablished);
@@ -629,10 +682,6 @@ impl GatewayClient {
        if !self.authenticated {
            return Err(GatewayClientError::NotAuthenticated);
        }
-        #[cfg(feature = "coconut")]
-        if self.bandwidth_remaining <= 0 {
-            return Err(GatewayClientError::NotEnoughBandwidth);
-        }
        if self.connection.is_partially_delegated() {
            return Ok(());
        }
@@ -660,22 +709,12 @@ impl GatewayClient {
        Ok(())
    }

-    pub async fn authenticate_and_start(
-        &mut self,
-        #[cfg(feature = "coconut")] coconut_credential: Option<Credential>,
-    ) -> Result<Arc<SharedKeys>, GatewayClientError> {
+    pub async fn authenticate_and_start(&mut self) -> Result<Arc<SharedKeys>, GatewayClientError> {
        if !self.connection.is_established() {
            self.establish_connection().await?;
        }
        let shared_key = self.perform_initial_authentication().await?;

-        #[cfg(feature = "coconut")]
-        {
-            if let Some(coconut_credential) = coconut_credential {
-                self.claim_coconut_bandwidth(coconut_credential).await?;
-            }
-        }
-
        // this call is NON-blocking
        self.start_listening_for_mixnet_messages()?;

@@ -2,39 +2,83 @@
 // SPDX-License-Identifier: Apache-2.0

 use gateway_requests::registration::handshake::error::HandshakeError;
-use std::fmt::{self, Error, Formatter};
 use std::io;
+use thiserror::Error;
 use tungstenite::Error as WsError;
 #[cfg(target_arch = "wasm32")]
 use wasm_bindgen::JsValue;
+#[cfg(not(feature = "coconut"))]
+use web3::Error as Web3Error;

-#[derive(Debug)]
+#[derive(Debug, Error)]
 pub enum GatewayClientError {
+    #[error("Connection to the gateway is not established")]
    ConnectionNotEstablished,
+
+    #[error("Gateway returned an error response - {0}")]
    GatewayError(String),
-    NetworkError(WsError),
+
+    #[error("There was a network error - {0}")]
+    NetworkError(#[from] WsError),

    // TODO: see if `JsValue` is a reasonable type for this
    #[cfg(target_arch = "wasm32")]
+    #[error("There was a network error")]
    NetworkErrorWasm(JsValue),

-    NoSharedKeyAvailable,
-    ConnectionAbruptlyClosed,
-    MalformedResponse,
-    SerializeCredential,
-    NotAuthenticated,
-    NotEnoughBandwidth,
-    UnexpectedResponse,
-    ConnectionInInvalidState,
-    RegistrationFailure(HandshakeError),
-    AuthenticationFailure,
-    Timeout,
-}
+    #[cfg(not(feature = "coconut"))]
+    #[error("Could not backup keypair - {0}")]
+    IOError(#[from] std::io::Error),

-impl From<WsError> for GatewayClientError {
-    fn from(err: WsError) -> Self {
-        GatewayClientError::NetworkError(err)
-    }
+    #[cfg(not(feature = "coconut"))]
+    #[error("Could not burn ERC20 token in Ethereum smart contract - {0}")]
+    BurnTokenError(#[from] Web3Error),
+
+    #[cfg(not(feature = "coconut"))]
+    #[error("Invalid Ethereum private key")]
+    InvalidEthereumPrivateKey,
+
+    #[error("Invalid URL - {0}")]
+    InvalidURL(String),
+
+    #[error("No shared key was provided or obtained")]
+    NoSharedKeyAvailable,
+
+    #[error("No bandwidth controller provided")]
+    NoBandwidthControllerAvailable,
+
+    #[error("Credential error - {0}")]
+    CredentialError(#[from] credentials::error::Error),
+
+    #[error("Connection was abruptly closed")]
+    ConnectionAbruptlyClosed,
+
+    #[error("Received response was malformed")]
+    MalformedResponse,
+
+    #[error("Credential could not be serialized")]
+    SerializeCredential,
+
+    #[error("Client is not authenticated")]
+    NotAuthenticated,
+
+    #[error("Client does not have enough bandwidth: estimated {0}, remaining: {1}")]
+    NotEnoughBandwidth(i64, i64),
+
+    #[error("Received an unexpected response")]
+    UnexpectedResponse,
+
+    #[error("Connection is in an invalid state - please send a bug report")]
+    ConnectionInInvalidState,
+
+    #[error("Failed to finish registration handshake - {0}")]
+    RegistrationFailure(HandshakeError),
+
+    #[error("Authentication failure")]
+    AuthenticationFailure,
+
+    #[error("Timed out")]
+    Timeout,
 }

 impl GatewayClientError {
@@ -54,60 +98,3 @@ impl GatewayClientError {
        }
    }
 }
-
-#[cfg(target_arch = "wasm32")]
-impl From<JsValue> for GatewayClientError {
-    fn from(err: JsValue) -> Self {
-        GatewayClientError::NetworkErrorWasm(err)
-    }
-}
-
-// better human readable representation of the error, mostly so that GatewayClientError
-// would implement std::error::Error
-impl fmt::Display for GatewayClientError {
-    fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
-        match self {
-            GatewayClientError::ConnectionNotEstablished => {
-                write!(f, "connection to the gateway is not established")
-            }
-            GatewayClientError::NoSharedKeyAvailable => {
-                write!(f, "no shared key was provided or obtained")
-            }
-            GatewayClientError::NotAuthenticated => write!(f, "client is not authenticated"),
-
-            GatewayClientError::NetworkError(err) => {
-                write!(f, "there was a network error - {}", err)
-            }
-            #[cfg(target_arch = "wasm32")]
-            GatewayClientError::NetworkErrorWasm(err) => {
-                write!(f, "there was a network error - {:?}", err)
-            }
-
-            GatewayClientError::ConnectionAbruptlyClosed => {
-                write!(f, "connection was abruptly closed")
-            }
-            GatewayClientError::Timeout => write!(f, "timed out"),
-            GatewayClientError::MalformedResponse => write!(f, "received response was malformed"),
-            GatewayClientError::ConnectionInInvalidState => write!(
-                f,
-                "connection is in an invalid state - please send a bug report"
-            ),
-            GatewayClientError::RegistrationFailure(handshake_err) => write!(
-                f,
-                "failed to finish registration handshake - {}",
-                handshake_err
-            ),
-            GatewayClientError::AuthenticationFailure => write!(f, "authentication failure"),
-            GatewayClientError::GatewayError(err) => {
-                write!(f, "gateway returned an error response - {}", err)
-            }
-            GatewayClientError::UnexpectedResponse => write!(f, "received an unexpected response"),
-            GatewayClientError::NotEnoughBandwidth => {
-                write!(f, "client does not have enough bandwidth")
-            }
-            GatewayClientError::SerializeCredential => {
-                write!(f, "credential could not be serialized")
-            }
-        }
-    }
-}
@@ -8,6 +8,7 @@ pub use packet_router::{
 };
 use tungstenite::{protocol::Message, Error as WsError};

+pub mod bandwidth;
 pub mod client;
 pub mod error;
 pub mod packet_router;
@@ -119,7 +119,7 @@ impl PartiallyDelegated {
            }
            .is_err()
            {
-                panic!("failed to send back `mixnet_receiver_future` result on the oneshot channel")
+                warn!("failed to send back `mixnet_receiver_future` result on the oneshot channel")
            }
        };

@@ -32,7 +32,7 @@ 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 }
-ts-rs = "3.0"
+ts-rs = {version = "5.1", optional = true}

 [features]
 nymd-client = ["async-trait", "bip39", "config", "cosmrs", "prost", "flate2", "sha2", "itertools", "cosmwasm-std"]
@@ -10,9 +10,9 @@ use mixnet_contract::StateParams;

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

 #[cfg(feature = "nymd-client")]
@@ -172,6 +172,57 @@ impl<C> Client<C> {
        Ok(self.nymd.get_state_params().await?)
    }

+    pub async fn get_current_rewarding_interval(
+        &self,
+    ) -> Result<RewardingIntervalResponse, ValidatorClientError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        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,
+    {
+        Ok(self.nymd.get_reward_pool().await?.u128())
+    }
+
+    pub async fn get_circulating_supply(&self) -> Result<u128, ValidatorClientError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        Ok(self.nymd.get_circulating_supply().await?.u128())
+    }
+
+    pub async fn get_sybil_resistance_percent(&self) -> Result<u8, ValidatorClientError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        Ok(self.nymd.get_sybil_resistance_percent().await?)
+    }
+
+    pub async fn get_epoch_reward_percent(&self) -> Result<u8, ValidatorClientError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        Ok(self.nymd.get_epoch_reward_percent().await?)
+    }
+
    // basically handles paging for us
    pub async fn get_all_nymd_mixnodes(&self) -> Result<Vec<MixNodeBond>, ValidatorClientError>
    where
@@ -6,9 +6,9 @@ use cosmrs::tx::{Fee, Gas};
 use cosmrs::Coin;
 use serde::{Deserialize, Serialize};
 use std::fmt;
-use ts_rs::TS;

-#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Serialize, Deserialize, TS)]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+#[derive(Debug, Copy, Clone, Ord, PartialOrd, Eq, PartialEq, Hash, Serialize, Deserialize)]
 pub enum Operation {
    Upload,
    Init,
@@ -23,10 +23,11 @@ pub enum Operation {

    BondGateway,
    UnbondGateway,
-    DelegateToGateway,
-    UndelegateFromGateway,

    UpdateStateParams,
+
+    BeginMixnodeRewarding,
+    FinishMixnodeRewarding,
 }

 pub(crate) fn calculate_fee(gas_price: &GasPrice, gas_limit: Gas) -> Coin {
@@ -43,13 +44,13 @@ impl fmt::Display for Operation {
            Operation::Send => f.write_str("Send"),
            Operation::BondMixnode => f.write_str("BondMixnode"),
            Operation::UnbondMixnode => f.write_str("UnbondMixnode"),
-            Operation::DelegateToMixnode => f.write_str("DelegateToMixnode"),
-            Operation::UndelegateFromMixnode => f.write_str("UndelegateFromMixnode"),
            Operation::BondGateway => f.write_str("BondGateway"),
            Operation::UnbondGateway => f.write_str("UnbondGateway"),
-            Operation::DelegateToGateway => f.write_str("DelegateToGateway"),
-            Operation::UndelegateFromGateway => f.write_str("UndelegateFromGateway"),
+            Operation::DelegateToMixnode => f.write_str("DelegateToMixnode"),
+            Operation::UndelegateFromMixnode => f.write_str("UndelegateFromMixnode"),
            Operation::UpdateStateParams => f.write_str("UpdateStateParams"),
+            Operation::BeginMixnodeRewarding => f.write_str("BeginMixnodeRewarding"),
+            Operation::FinishMixnodeRewarding => f.write_str("FinishMixnodeRewarding"),
        }
    }
 }
@@ -71,10 +72,10 @@ impl Operation {

            Operation::BondGateway => 175_000u64.into(),
            Operation::UnbondGateway => 175_000u64.into(),
-            Operation::DelegateToGateway => 175_000u64.into(),
-            Operation::UndelegateFromGateway => 175_000u64.into(),

            Operation::UpdateStateParams => 175_000u64.into(),
+            Operation::BeginMixnodeRewarding => 175_000u64.into(),
+            Operation::FinishMixnodeRewarding => 175_000u64.into(),
        }
    }

@@ -11,12 +11,13 @@ use crate::nymd::fee_helpers::Operation;
 use crate::nymd::wallet::DirectSecp256k1HdWallet;
 use cosmrs::rpc::endpoint::broadcast;
 use cosmrs::rpc::{Error as TendermintRpcError, HttpClientUrl};
-use cosmwasm_std::Coin;
+use cosmwasm_std::{Coin, Uint128};
 use mixnet_contract::{
    Addr, Delegation, ExecuteMsg, Gateway, GatewayOwnershipResponse, IdentityKey,
-    LayerDistribution, MixNode, MixOwnershipResponse, PagedAllDelegationsResponse,
-    PagedGatewayResponse, PagedMixDelegationsResponse, PagedMixnodeResponse,
-    PagedReverseMixDelegationsResponse, QueryMsg, RawDelegationData, StateParams,
+    LayerDistribution, MixNode, MixOwnershipResponse, MixnodeRewardingStatusResponse,
+    PagedAllDelegationsResponse, PagedGatewayResponse, PagedMixDelegationsResponse,
+    PagedMixnodeResponse, PagedReverseMixDelegationsResponse, QueryMsg, RawDelegationData,
+    RewardingIntervalResponse, StateParams,
 };
 use serde::Serialize;
 use std::collections::HashMap;
@@ -27,10 +28,11 @@ pub use crate::nymd::cosmwasm_client::signing_client::SigningCosmWasmClient;
 pub use crate::nymd::gas_price::GasPrice;
 pub use cosmrs::rpc::HttpClient as QueryNymdClient;
 pub use cosmrs::tendermint::block::Height;
+pub use cosmrs::tendermint::hash;
 pub use cosmrs::tendermint::Time as TendermintTime;
 pub use cosmrs::tx::{Fee, Gas};
 pub use cosmrs::Coin as CosmosCoin;
-pub use cosmrs::{AccountId, Denom};
+pub use cosmrs::{AccountId, Decimal, Denom};
 pub use signing_client::Client as SigningNymdClient;

 pub mod cosmwasm_client;
@@ -184,6 +186,21 @@ impl<C> NymdClient<C> {
        self.client.get_height().await
    }

+    /// Obtains the hash of a block specified by the provided height.
+    ///
+    /// # Arguments
+    ///
+    /// * `height`: height of the block for which we want to obtain the hash.
+    pub async fn get_block_hash(&self, height: u32) -> Result<hash::Hash, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        self.client
+            .get_block(Some(height))
+            .await
+            .map(|block| block.block_id.hash)
+    }
+
    pub async fn get_balance(&self, address: &AccountId) -> Result<Option<CosmosCoin>, NymdError>
    where
        C: CosmWasmClient + Sync,
@@ -201,6 +218,35 @@ impl<C> NymdClient<C> {
            .await
    }

+    pub async fn get_current_rewarding_interval(
+        &self,
+    ) -> Result<RewardingIntervalResponse, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        let request = QueryMsg::CurrentRewardingInterval {};
+        self.client
+            .query_contract_smart(self.contract_address()?, &request)
+            .await
+    }
+
+    pub async fn get_rewarding_status(
+        &self,
+        mix_identity: mixnet_contract::IdentityKey,
+        rewarding_interval_nonce: u32,
+    ) -> Result<MixnodeRewardingStatusResponse, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        let request = QueryMsg::GetRewardingStatus {
+            mix_identity,
+            rewarding_interval_nonce,
+        };
+        self.client
+            .query_contract_smart(self.contract_address()?, &request)
+            .await
+    }
+
    pub async fn get_layer_distribution(&self) -> Result<LayerDistribution, NymdError>
    where
        C: CosmWasmClient + Sync,
@@ -211,6 +257,46 @@ impl<C> NymdClient<C> {
            .await
    }

+    pub async fn get_reward_pool(&self) -> Result<Uint128, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        let request = QueryMsg::GetRewardPool {};
+        self.client
+            .query_contract_smart(self.contract_address()?, &request)
+            .await
+    }
+
+    pub async fn get_circulating_supply(&self) -> Result<Uint128, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        let request = QueryMsg::GetCirculatingSupply {};
+        self.client
+            .query_contract_smart(self.contract_address()?, &request)
+            .await
+    }
+
+    pub async fn get_sybil_resistance_percent(&self) -> Result<u8, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        let request = QueryMsg::GetSybilResistancePercent {};
+        self.client
+            .query_contract_smart(self.contract_address()?, &request)
+            .await
+    }
+
+    pub async fn get_epoch_reward_percent(&self) -> Result<u8, NymdError>
+    where
+        C: CosmWasmClient + Sync,
+    {
+        let request = QueryMsg::GetEpochRewardPercent {};
+        self.client
+            .query_contract_smart(self.contract_address()?, &request)
+            .await
+    }
+
    /// Checks whether there is a bonded mixnode associated with the provided client's address
    pub async fn owns_mixnode(&self, address: &AccountId) -> Result<bool, NymdError>
    where
@@ -642,6 +728,54 @@ impl<C> NymdClient<C> {
            )
            .await
    }
+
+    pub async fn begin_mixnode_rewarding(
+        &self,
+        rewarding_interval_nonce: u32,
+    ) -> Result<ExecuteResult, NymdError>
+    where
+        C: SigningCosmWasmClient + Sync,
+    {
+        let fee = self.get_fee(Operation::BeginMixnodeRewarding);
+
+        let req = ExecuteMsg::BeginMixnodeRewarding {
+            rewarding_interval_nonce,
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.contract_address()?,
+                &req,
+                fee,
+                "Beginning mixnode rewarding procedure",
+                Vec::new(),
+            )
+            .await
+    }
+
+    pub async fn finish_mixnode_rewarding(
+        &self,
+        rewarding_interval_nonce: u32,
+    ) -> Result<ExecuteResult, NymdError>
+    where
+        C: SigningCosmWasmClient + Sync,
+    {
+        let fee = self.get_fee(Operation::FinishMixnodeRewarding);
+
+        let req = ExecuteMsg::FinishMixnodeRewarding {
+            rewarding_interval_nonce,
+        };
+        self.client
+            .execute(
+                self.address(),
+                self.contract_address()?,
+                &req,
+                fee,
+                "Finishing mixnode rewarding procedure",
+                Vec::new(),
+            )
+            .await
+    }
 }

 fn cosmwasm_coin_to_cosmos_coin(coin: Coin) -> CosmosCoin {
@@ -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()
@@ -11,4 +11,6 @@ url = "2.2"

 # I guess temporarily until we get serde support in coconut up and running
 coconut-interface = { path = "../coconut-interface" }
+crypto = { path = "../crypto" }
+network-defaults = { path = "../network-defaults" }
 validator-client = { path = "../client-libs/validator-client" }
@@ -1,48 +0,0 @@
-// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
-// SPDX-License-Identifier: Apache-2.0
-
-// for time being assume the bandwidth credential consists of public identity of the requester
-// and private (though known... just go along with it) infinite bandwidth value
-// right now this has no double-spending protection, spender binding, etc
-// it's the simplest possible case
-
-use url::Url;
-
-use crate::error::Error;
-use crate::utils::{obtain_aggregate_signature, prepare_credential_for_spending};
-use coconut_interface::{hash_to_scalar, Credential, Parameters, Signature, VerificationKey};
-
-const BANDWIDTH_VALUE: u64 = 10 * 1024 * 1024 * 1024; // 10 GB
-
-pub const PUBLIC_ATTRIBUTES: u32 = 1;
-pub const PRIVATE_ATTRIBUTES: u32 = 1;
-pub const TOTAL_ATTRIBUTES: u32 = PUBLIC_ATTRIBUTES + PRIVATE_ATTRIBUTES;
-
-// 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)];
-
-    let params = Parameters::new(TOTAL_ATTRIBUTES)?;
-
-    obtain_aggregate_signature(&params, &public_attributes, &private_attributes, validators).await
-}
-
-pub fn prepare_for_spending(
-    raw_identity: &[u8],
-    signature: &Signature,
-    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 params = Parameters::new(TOTAL_ATTRIBUTES)?;
-
-    prepare_credential_for_spending(
-        &params,
-        public_attributes,
-        private_attributes,
-        signature,
-        verification_key,
-    )
-}
@@ -0,0 +1,77 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+// for time being assume the bandwidth credential consists of public identity of the requester
+// and private (though known... just go along with it) infinite bandwidth value
+// 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 crate::error::Error;
+
+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(
+    params: &Parameters,
+    attributes: &BandwidthVoucherAttributes,
+    validators: &[Url],
+) -> Result<Signature, Error> {
+    let public_attributes = attributes.get_public_attributes();
+    let private_attributes = attributes.get_private_attributes();
+
+    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![
+        raw_identity.to_vec(),
+        BANDWIDTH_VALUE.to_be_bytes().to_vec(),
+    ];
+
+    let params = Parameters::new(TOTAL_ATTRIBUTES)?;
+
+    prepare_credential_for_spending(
+        &params,
+        public_attributes,
+        attributes.serial_number,
+        attributes.binding_number,
+        signature,
+        verification_key,
+    )
+}
@@ -0,0 +1,5 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub mod bandwidth;
+pub mod utils;
@@ -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,
@@ -1,8 +1,8 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-pub mod bandwidth;
+pub mod coconut;
 pub mod error;
-mod utils;
+pub mod token;

-pub use utils::{obtain_aggregate_signature, obtain_aggregate_verification_key};
+pub use coconut::utils::{obtain_aggregate_signature, obtain_aggregate_verification_key};
@@ -0,0 +1,140 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use crypto::asymmetric::identity::{PublicKey, Signature, PUBLIC_KEY_LENGTH, SIGNATURE_LENGTH};
+
+use crate::error::Error;
+use std::convert::TryInto;
+
+#[cfg(not(feature = "coconut"))]
+pub struct TokenCredential {
+    verification_key: PublicKey,
+    gateway_identity: PublicKey,
+    bandwidth: u64,
+    signature: Signature,
+}
+
+#[cfg(not(feature = "coconut"))]
+impl TokenCredential {
+    pub fn new(
+        verification_key: PublicKey,
+        gateway_identity: PublicKey,
+        bandwidth: u64,
+        signature: Signature,
+    ) -> Self {
+        TokenCredential {
+            verification_key,
+            gateway_identity,
+            bandwidth,
+            signature,
+        }
+    }
+
+    pub fn verification_key(&self) -> PublicKey {
+        self.verification_key
+    }
+
+    pub fn gateway_identity(&self) -> PublicKey {
+        self.gateway_identity
+    }
+
+    pub fn bandwidth(&self) -> u64 {
+        self.bandwidth
+    }
+
+    pub fn signature_bytes(&self) -> [u8; 64] {
+        self.signature.to_bytes()
+    }
+
+    pub fn verify_signature(&self) -> bool {
+        let message: Vec<u8> = self
+            .verification_key
+            .to_bytes()
+            .iter()
+            .chain(self.gateway_identity.to_bytes().iter())
+            .copied()
+            .collect();
+        self.verification_key
+            .verify(&message, &self.signature)
+            .is_ok()
+    }
+
+    pub fn to_bytes(&self) -> Vec<u8> {
+        self.verification_key
+            .to_bytes()
+            .iter()
+            .chain(self.gateway_identity.to_bytes().iter())
+            .chain(self.bandwidth.to_be_bytes().iter())
+            .chain(self.signature.to_bytes().iter())
+            .copied()
+            .collect()
+    }
+
+    pub fn from_bytes(b: &[u8]) -> Result<Self, Error> {
+        if b.len() != 2 * PUBLIC_KEY_LENGTH + 8 + SIGNATURE_LENGTH {
+            return Err(Error::BandwidthCredentialError);
+        }
+        let verification_key = PublicKey::from_bytes(&b[..PUBLIC_KEY_LENGTH])
+            .map_err(|_| Error::BandwidthCredentialError)?;
+        let gateway_identity = PublicKey::from_bytes(&b[PUBLIC_KEY_LENGTH..2 * PUBLIC_KEY_LENGTH])
+            .map_err(|_| Error::BandwidthCredentialError)?;
+        let bandwidth = u64::from_be_bytes(
+            b[2 * PUBLIC_KEY_LENGTH..2 * PUBLIC_KEY_LENGTH + 8]
+                .try_into()
+                // unwrapping is safe because we know we have 8 bytes
+                .unwrap(),
+        );
+        let signature = Signature::from_bytes(&b[2 * PUBLIC_KEY_LENGTH + 8..])
+            .map_err(|_| Error::BandwidthCredentialError)?;
+        Ok(TokenCredential {
+            verification_key,
+            gateway_identity,
+            bandwidth,
+            signature,
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[cfg(not(feature = "coconut"))]
+    #[test]
+    fn token_serde() {
+        // pre-generated, valid values
+        let verification_key = PublicKey::from_bytes(&[
+            103, 105, 71, 177, 149, 245, 26, 32, 73, 121, 76, 50, 94, 88, 119, 231, 91, 229, 167,
+            56, 39, 62, 185, 39, 83, 246, 153, 27, 17, 155, 109, 73,
+        ])
+        .unwrap();
+        let gateway_identity = PublicKey::from_bytes(&[
+            37, 113, 137, 189, 157, 82, 35, 2, 187, 136, 61, 119, 98, 5, 245, 82, 46, 124, 67, 45,
+            165, 255, 53, 222, 185, 252, 6, 148, 128, 15, 206, 19,
+        ])
+        .unwrap();
+        let signature = Signature::from_bytes(&[
+            117, 251, 162, 217, 57, 2, 50, 210, 206, 81, 236, 90, 74, 201, 69, 237, 240, 247, 214,
+            158, 220, 89, 235, 222, 85, 134, 73, 73, 8, 60, 25, 39, 183, 28, 83, 193, 31, 174, 25,
+            24, 38, 215, 205, 228, 159, 135, 35, 4, 171, 59, 100, 157, 12, 249, 77, 52, 143, 4, 32,
+            28, 147, 70, 182, 14,
+        ])
+        .unwrap();
+        let credential = TokenCredential::new(verification_key, gateway_identity, 1024, signature);
+        let serialized_credential = credential.to_bytes();
+        let deserialized_credential = TokenCredential::from_bytes(&serialized_credential).unwrap();
+        assert_eq!(
+            credential.verification_key,
+            deserialized_credential.verification_key
+        );
+        assert_eq!(
+            credential.gateway_identity,
+            deserialized_credential.gateway_identity
+        );
+        assert_eq!(credential.bandwidth, deserialized_credential.bandwidth);
+        assert_eq!(
+            credential.signature.to_bytes(),
+            deserialized_credential.signature.to_bytes()
+        );
+    }
+}
@@ -0,0 +1,4 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+pub mod bandwidth;
@@ -0,0 +1,10 @@
+[package]
+name = "erc20-bridge-contract"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+schemars = "0.8"
+serde = { version = "1.0.103", default-features = false, features = ["derive"] }
@@ -0,0 +1,45 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+
+// Serializable structures for what we find in common/crypto
+#[derive(Serialize, Deserialize, Copy, Clone, Debug, PartialEq, JsonSchema)]
+pub struct PublicKey([u8; 32]);
+
+impl PublicKey {
+    pub fn new(bytes: [u8; 32]) -> Self {
+        PublicKey(bytes)
+    }
+    pub fn to_bytes(&self) -> [u8; 32] {
+        self.0
+    }
+}
+
+impl AsRef<[u8]> for PublicKey {
+    #[inline]
+    fn as_ref(&self) -> &[u8] {
+        &self.0
+    }
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
+pub struct Signature([u8; 32], [u8; 32]);
+
+impl Signature {
+    pub fn new(bytes: [u8; 64]) -> Self {
+        let mut sig1 = [0u8; 32];
+        let mut sig2 = [0u8; 32];
+        sig1.copy_from_slice(&bytes[..32]);
+        sig2.copy_from_slice(&bytes[32..]);
+
+        Signature(sig1, sig2)
+    }
+    pub fn to_bytes(&self) -> [u8; 64] {
+        let mut res = [0u8; 64];
+        res[..32].copy_from_slice(&self.0);
+        res[32..].copy_from_slice(&self.1);
+        res
+    }
+}
@@ -0,0 +1,3 @@
+pub mod keys;
+pub mod msg;
+pub mod payment;
@@ -0,0 +1,30 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+
+use crate::keys::PublicKey;
+use crate::payment::LinkPaymentData;
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
+pub struct InstantiateMsg {}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum ExecuteMsg {
+    LinkPayment { data: LinkPaymentData },
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum QueryMsg {
+    GetPayments {
+        limit: Option<u32>,
+        start_after: Option<PublicKey>,
+    },
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub struct MigrateMsg {}
@@ -0,0 +1,73 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+
+use crate::keys::{PublicKey, Signature};
+
+#[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
+pub struct Payment {
+    verification_key: PublicKey,
+    gateway_identity: PublicKey,
+    bandwidth: u64,
+}
+
+impl Payment {
+    pub fn new(verification_key: PublicKey, gateway_identity: PublicKey, bandwidth: u64) -> Self {
+        Payment {
+            verification_key,
+            gateway_identity,
+            bandwidth,
+        }
+    }
+
+    pub fn verification_key(&self) -> PublicKey {
+        self.verification_key
+    }
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
+pub struct LinkPaymentData {
+    pub verification_key: PublicKey,
+    pub gateway_identity: PublicKey,
+    pub bandwidth: u64,
+    pub signature: Signature,
+}
+
+impl LinkPaymentData {
+    pub fn new(
+        verification_key: [u8; 32],
+        gateway_identity: [u8; 32],
+        bandwidth: u64,
+        signature: [u8; 64],
+    ) -> Self {
+        LinkPaymentData {
+            verification_key: PublicKey::new(verification_key),
+            gateway_identity: PublicKey::new(gateway_identity),
+            bandwidth,
+            signature: Signature::new(signature),
+        }
+    }
+}
+
+#[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
+pub struct PagedPaymentResponse {
+    pub payments: Vec<Payment>,
+    pub per_page: usize,
+    pub start_next_after: Option<PublicKey>,
+}
+
+impl PagedPaymentResponse {
+    pub fn new(
+        payments: Vec<Payment>,
+        per_page: usize,
+        start_next_after: Option<PublicKey>,
+    ) -> Self {
+        PagedPaymentResponse {
+            payments,
+            per_page,
+            start_next_after,
+        }
+    }
+}
@@ -8,10 +8,18 @@ edition = "2018"

 [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 = { git = "https://github.com/jstuczyn/cosmwasm", branch = "0.14.1-updatedk256" }
 #cosmwasm-std = { version = "0.14.1" }

 serde = { version = "1.0", features = ["derive"] }
 serde_repr = "0.1"
 schemars = "0.8"
-ts-rs = "3.0"
+ts-rs = { version = "5.1", optional = true }
+thiserror = "1.0"
+network-defaults = { path = "../network-defaults" }
+fixed = { version = "1.1", features = ["serde"] }
+az = "1.1"
+log = "0.4.14"
+
+[features]
+default = []
@@ -0,0 +1,9 @@
+use thiserror::Error;
+
+#[derive(Error, Debug, PartialEq)]
+pub enum MixnetContractError {
+    #[error("Overflow Error")]
+    OverflowError(#[from] cosmwasm_std::OverflowError),
+    #[error("reward_blockstamp field not set, set_reward_blockstamp must be called before attempting to issue rewards")]
+    BlockstampNotSet,
+}
@@ -7,9 +7,9 @@ use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use std::cmp::Ordering;
 use std::fmt::Display;
-use ts_rs::TS;

-#[derive(Clone, Debug, Deserialize, PartialEq, PartialOrd, Serialize, JsonSchema, TS)]
+#[cfg_attr(feature = "ts-rs", derive(ts_rs::TS))]
+#[derive(Clone, Debug, Deserialize, PartialEq, PartialOrd, Serialize, JsonSchema)]
 pub struct Gateway {
    pub host: String,
    pub mix_port: u16,
@@ -2,11 +2,14 @@
 // SPDX-License-Identifier: Apache-2.0

 mod delegation;
+pub mod error;
 mod gateway;
-mod mixnode;
+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,
@@ -15,4 +18,4 @@ pub use delegation::{
 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, SphinxKey, StateParams};
+pub use types::*;
@@ -2,15 +2,24 @@
 #![allow(clippy::field_reassign_with_default)]

 use crate::{IdentityKey, SphinxKey};
-use cosmwasm_std::{coin, Addr, Coin};
+use az::CheckedCast;
+use cosmwasm_std::{coin, Addr, Coin, Uint128};
+use log::error;
+use network_defaults::{DEFAULT_OPERATOR_EPOCH_COST, DEFAULT_PROFIT_MARGIN};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use serde_repr::{Deserialize_repr, Serialize_repr};
 use std::cmp::Ordering;
 use std::fmt::Display;
-use ts_rs::TS;

-#[derive(Clone, Debug, Deserialize, PartialEq, PartialOrd, Serialize, JsonSchema, TS)]
+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 {
    pub host: String,
    pub mix_port: u16,
@@ -43,6 +52,181 @@ pub enum Layer {
    Three = 3,
 }

+#[derive(Debug, Clone, JsonSchema, PartialEq, Serialize, Deserialize, Copy)]
+pub struct NodeRewardParams {
+    period_reward_pool: Uint128,
+    k: Uint128,
+    reward_blockstamp: u64,
+    circulating_supply: Uint128,
+    uptime: Uint128,
+    sybil_resistance_percent: u8,
+}
+
+impl NodeRewardParams {
+    pub fn new(
+        period_reward_pool: u128,
+        k: u128,
+        reward_blockstamp: u64,
+        circulating_supply: u128,
+        uptime: u128,
+        sybil_resistance_percent: u8,
+    ) -> NodeRewardParams {
+        NodeRewardParams {
+            period_reward_pool: Uint128(period_reward_pool),
+            k: Uint128(k),
+            reward_blockstamp,
+            circulating_supply: Uint128(circulating_supply),
+            uptime: Uint128(uptime),
+            sybil_resistance_percent,
+        }
+    }
+
+    pub fn performance(&self) -> U128 {
+        U128::from_num(self.uptime.u128()) / U128::from_num(100)
+    }
+
+    pub fn operator_cost(&self) -> U128 {
+        U128::from_num(self.uptime.u128() / 100u128 * DEFAULT_OPERATOR_EPOCH_COST as u128)
+    }
+
+    pub fn set_reward_blockstamp(&mut self, blockstamp: u64) {
+        self.reward_blockstamp = blockstamp;
+    }
+
+    pub fn period_reward_pool(&self) -> u128 {
+        self.period_reward_pool.u128()
+    }
+
+    pub fn k(&self) -> u128 {
+        self.k.u128()
+    }
+
+    pub fn circulating_supply(&self) -> u128 {
+        self.circulating_supply.u128()
+    }
+
+    pub fn reward_blockstamp(&self) -> u64 {
+        self.reward_blockstamp
+    }
+
+    pub fn uptime(&self) -> u128 {
+        self.uptime.u128()
+    }
+
+    pub fn one_over_k(&self) -> U128 {
+        ONE / U128::from_num(self.k.u128())
+    }
+
+    pub fn alpha(&self) -> U128 {
+        U128::from_num(self.sybil_resistance_percent) / U128::from_num(100)
+    }
+}
+
+// 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,
+    lambda: U128,
+    sigma: U128,
+}
+
+impl NodeRewardResult {
+    pub fn reward(&self) -> U128 {
+        self.reward
+    }
+
+    pub fn lambda(&self) -> U128 {
+        self.lambda
+    }
+
+    pub fn sigma(&self) -> U128 {
+        self.sigma
+    }
+}
+
 #[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
 pub struct MixNodeBond {
    pub bond_amount: Coin,
@@ -51,6 +235,7 @@ pub struct MixNodeBond {
    pub layer: Layer,
    pub block_height: u64,
    pub mix_node: MixNode,
+    pub profit_margin_percent: Option<u8>,
 }

 impl MixNodeBond {
@@ -60,6 +245,7 @@ impl MixNodeBond {
        layer: Layer,
        block_height: u64,
        mix_node: MixNode,
+        profit_margin_percent: Option<u8>,
    ) -> Self {
        MixNodeBond {
            total_delegation: coin(0, &bond_amount.denom),
@@ -68,9 +254,15 @@ impl MixNodeBond {
            layer,
            block_height,
            mix_node,
+            profit_margin_percent,
        }
    }

+    pub fn profit_margin(&self) -> U128 {
+        U128::from_num(self.profit_margin_percent.unwrap_or(DEFAULT_PROFIT_MARGIN))
+            / U128::from_num(100)
+    }
+
    pub fn identity(&self) -> &String {
        &self.mix_node.identity_key
    }
@@ -86,6 +278,107 @@ impl MixNodeBond {
    pub fn mix_node(&self) -> &MixNode {
        &self.mix_node
    }
+
+    pub fn total_stake(&self) -> Option<u128> {
+        if self.bond_amount.denom != self.total_delegation.denom {
+            None
+        } else {
+            Some(self.bond_amount.amount.u128() + self.total_delegation.amount.u128())
+        }
+    }
+
+    pub fn total_delegation(&self) -> Coin {
+        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 total_stake_to_circulating_supply(&self, circulating_supply: u128) -> U128 {
+        U128::from_num(self.bond_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())
+    }
+
+    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())
+    }
+
+    pub fn reward(&self, params: &NodeRewardParams) -> NodeRewardResult {
+        // Assuming uniform work distribution across the network this is one_over_k * k
+        let omega_k = ONE;
+        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())
+            / (ONE + params.alpha());
+
+        NodeRewardResult {
+            reward,
+            lambda,
+            sigma,
+        }
+    }
+
+    pub fn node_profit(&self, params: &NodeRewardParams) -> U128 {
+        if self.reward(params).reward() < params.operator_cost() {
+            U128::from_num(0)
+        } else {
+            self.reward(params).reward() - params.operator_cost()
+        }
+    }
+
+    pub fn operator_reward(&self, params: &NodeRewardParams) -> u128 {
+        let reward = self.reward(params);
+        let profit = if reward.reward < params.operator_cost() {
+            U128::from_num(0)
+        } else {
+            reward.reward - params.operator_cost()
+        };
+        let operator_base_reward = reward.reward.min(params.operator_cost());
+        let operator_reward = (self.profit_margin()
+            + (ONE - self.profit_margin()) * reward.lambda / reward.sigma)
+            * profit;
+
+        let reward = (operator_reward + operator_base_reward).max(U128::from_num(0));
+
+        if let Some(int_reward) = reward.checked_cast() {
+            int_reward
+        } else {
+            error!(
+                "Could not cast reward ({}) to u128, returning 0 - mixnode {}",
+                reward,
+                self.identity()
+            );
+            0u128
+        }
+    }
+
+    pub fn sigma_ratio(&self, params: &NodeRewardParams) -> U128 {
+        if self.total_stake_to_circulating_supply(params.circulating_supply()) < params.one_over_k()
+        {
+            self.total_stake_to_circulating_supply(params.circulating_supply())
+        } else {
+            params.one_over_k()
+        }
+    }
+
+    pub fn reward_delegation(&self, delegation_amount: Uint128, params: &NodeRewardParams) -> u128 {
+        let reward_params = DelegatorRewardParams::new(self, *params);
+        reward_params.determine_delegation_reward(delegation_amount)
+    }
 }

 impl PartialOrd for MixNodeBond {
@@ -217,6 +510,7 @@ mod tests {
            layer: Layer::One,
            block_height: 100,
            mix_node: mixnode_fixture(),
+            profit_margin_percent: Some(10),
        };

        let mix2 = MixNodeBond {
@@ -226,6 +520,7 @@ mod tests {
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
+            profit_margin_percent: Some(10),
        };

        let mix3 = MixNodeBond {
@@ -235,6 +530,7 @@ mod tests {
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
+            profit_margin_percent: Some(10),
        };

        let mix4 = MixNodeBond {
@@ -244,6 +540,7 @@ mod tests {
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
+            profit_margin_percent: Some(10),
        };

        let mix5 = MixNodeBond {
@@ -253,6 +550,7 @@ mod tests {
            layer: Layer::One,
            block_height: 120,
            mix_node: mixnode_fixture(),
+            profit_margin_percent: Some(10),
        };

        // summary:
@@ -1,6 +1,7 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

+use crate::mixnode::NodeRewardParams;
 use crate::StateParams;
 use crate::{Gateway, IdentityKey, MixNode};
 use cosmwasm_std::Addr;
@@ -31,10 +32,29 @@ pub enum ExecuteMsg {
        mix_identity: IdentityKey,
    },

-    RewardMixnode {
+    BeginMixnodeRewarding {
+        // nonce of the current rewarding interval
+        rewarding_interval_nonce: u32,
+    },
+
+    FinishMixnodeRewarding {
+        // nonce of the current rewarding interval
+        rewarding_interval_nonce: u32,
+    },
+
+    RewardMixnodeV2 {
        identity: IdentityKey,
        // percentage value in range 0-100
-        uptime: u32,
+        params: NodeRewardParams,
+
+        // nonce of the current rewarding interval
+        rewarding_interval_nonce: u32,
+    },
+
+    RewardNextMixDelegators {
+        mix_identity: IdentityKey,
+        // nonce of the current rewarding interval
+        rewarding_interval_nonce: u32,
    },
 }

@@ -56,6 +76,7 @@ pub enum QueryMsg {
        address: Addr,
    },
    StateParams {},
+    CurrentRewardingInterval {},
    GetMixDelegations {
        mix_identity: IdentityKey,
        start_after: Option<Addr>,
@@ -75,6 +96,14 @@ pub enum QueryMsg {
        address: Addr,
    },
    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::Uint128;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use std::fmt::{self, Display, Formatter};
@@ -26,33 +27,40 @@ impl LayerDistribution {
    }
 }

+#[derive(Debug, Default, Serialize, Deserialize, Copy, Clone, Eq, PartialEq)]
+pub struct RewardingIntervalResponse {
+    pub current_rewarding_interval_starting_block: u64,
+    pub current_rewarding_interval_nonce: u32,
+    pub rewarding_in_progress: bool,
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, JsonSchema)]
 pub struct StateParams {
-    pub epoch_length: u32, // length of an epoch, expressed in hours
-
+    // 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_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
+    // number of mixnode that are going to get rewarded during current rewarding interval (k_m)
+    // based on overall demand for private bandwidth-
+    pub mixnode_rewarded_set_size: u32,
+
+    // 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,
 }

 impl Display for StateParams {
    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
-        )?;
-        write!(
-            f,
-            "mixnode delegation reward rate: {}; ",
-            self.mixnode_delegation_reward_rate
+            "mixnode rewarded set size: {}",
+            self.mixnode_rewarded_set_size
        )?;
        write!(
            f,
@@ -62,6 +70,33 @@ impl Display for StateParams {
    }
 }

+#[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: String,
+
+    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>,
+}
+
 // type aliases for better reasoning about available data
 pub type IdentityKey = String;
 pub type IdentityKeyRef<'a> = &'a str;
@@ -7,6 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

 [dependencies]
+hex-literal = "0.3.3"
 serde = {version = "1.0", features = ["derive"]}
 url = "2.2"
 time = { version = "0.3", features = ["macros"] }
@@ -0,0 +1,132 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+// This should be modified whenever an updated Ethereum contract is uploaded
+pub const ETH_JSON_ABI: &str = r#"
+[
+  {
+    "inputs": [
+      {
+        "internalType": "contract ERC20Burnable",
+        "name": "_erc20",
+        "type": "address"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "Bandwidth",
+        "type": "uint256"
+      },
+      {
+        "indexed": true,
+        "internalType": "uint256",
+        "name": "VerificationKey",
+        "type": "uint256"
+      },
+      {
+        "indexed": false,
+        "internalType": "bytes",
+        "name": "SignedVerificationKey",
+        "type": "bytes"
+      }
+    ],
+    "name": "Burned",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "previousOwner",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "newOwner",
+        "type": "address"
+      }
+    ],
+    "name": "OwnershipTransferred",
+    "type": "event"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      },
+      {
+        "internalType": "uint256",
+        "name": "verificationKey",
+        "type": "uint256"
+      },
+      {
+        "internalType": "bytes",
+        "name": "signedVerificationKey",
+        "type": "bytes"
+      }
+    ],
+    "name": "burnTokenForAccessCode",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "erc20",
+    "outputs": [
+      {
+        "internalType": "contract ERC20Burnable",
+        "name": "",
+        "type": "address"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "owner",
+    "outputs": [
+      {
+        "internalType": "address",
+        "name": "",
+        "type": "address"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "renounceOwnership",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "newOwner",
+        "type": "address"
+      }
+    ],
+    "name": "transferOwnership",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  }
+]
+        "#;
@@ -5,6 +5,8 @@ use std::time::Duration;
 use time::OffsetDateTime;
 use url::Url;

+pub mod eth_contract;
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct ValidatorDetails {
    // it is assumed those values are always valid since they're being provided in our defaults file
@@ -61,7 +63,24 @@ pub fn default_api_endpoints() -> Vec<Url> {
 }

 pub const DEFAULT_MIXNET_CONTRACT_ADDRESS: &str = "punk10pyejy66429refv3g35g2t7am0was7yalwrzen";
-pub const NETWORK_MONITOR_ADDRESS: &str = "punk1v9qauwdq5terag6uvfsdytcs2d0sdmfdy7hgk3";
+pub const REWARDING_VALIDATOR_ADDRESS: &str = "punk1v9qauwdq5terag6uvfsdytcs2d0sdmfdy7hgk3";
+
+/// How much bandwidth (in bytes) one token can buy
+const BYTES_PER_TOKEN: u64 = 1024 * 1024 * 1024;
+/// How many ERC20 tokens should be burned to buy bandwidth
+pub const TOKENS_TO_BURN: u64 = 10;
+/// Default bandwidth (in bytes) that we try to buy
+pub const BANDWIDTH_VALUE: u64 = TOKENS_TO_BURN * BYTES_PER_TOKEN;
+
+// Ethereum constants used for token bridge
+pub const ETH_CONTRACT_ADDRESS: [u8; 20] =
+    hex_literal::hex!("9fEE3e28c17dbB87310A51F13C4fbf4331A6f102");
+pub const ETH_MIN_BLOCK_DEPTH: usize = 7;
+pub const COSMOS_CONTRACT_ADDRESS: &str = "punk1jld76tqw4wnpfenmay2xkv86nr3j0w426eka82";
+// Name of the event triggered by the eth contract. If the event name is changed,
+// this would also need to be changed; It is currently tested against the json abi
+pub const ETH_EVENT_NAME: &str = "Burned";
+pub const ETH_BURN_FUNCTION_NAME: &str = "burnTokenForAccessCode";

 /// Defaults Cosmos Hub/ATOM path
 pub const COSMOS_DERIVATION_PATH: &str = "m/44'/118'/0'/0/0";
@@ -93,4 +112,11 @@ pub const VALIDATOR_API_VERSION: &str = "v1";

 // REWARDING
 pub const DEFAULT_FIRST_EPOCH_START: OffsetDateTime = time::macros::datetime!(2021-08-23 12:00 UTC);
-pub const DEFAULT_EPOCH_LENGTH: Duration = Duration::from_secs(24 * 60 * 60); // 24h
+pub const DEFAULT_EPOCH_LENGTH: Duration = Duration::from_secs(24 * 60 * 60 * 30); // 30 days
+/// 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_OPERATOR_EPOCH_COST: u64 = 40_000_000; // 40$/(30 days) at 1 Nym == 1$
+
+// TODO: is there a way to get this from the chain
+pub const TOTAL_SUPPLY: u128 = 1_000_000_000_000_000;
+
+pub const DEFAULT_PROFIT_MARGIN: u8 = 10;
@@ -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));
+    }
+}
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+
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@@ -0,0 +1,40 @@
+[package]
+name = "cosmos_contract"
+version = "0.1.0"
+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"]
+
+[dev-dependencies]
+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"] }
+
+schemars = "0.8"
+serde = { version = "1.0.103", default-features = false, features = ["derive"] }
+thiserror = "1.0.23"
@@ -0,0 +1,27 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use cosmwasm_std::{StdError, VerificationError};
+use thiserror::Error;
+
+/// Custom errors for contract failure conditions.
+///
+/// Add any other custom errors you like here.
+/// Look at https://docs.rs/thiserror/1.0.21/thiserror/ for details.
+#[derive(Error, Debug, PartialEq)]
+pub enum ContractError {
+    #[error("{0}")]
+    Std(#[from] StdError),
+
+    #[error("Invalid size for signature items")]
+    InvalidSignatureSize,
+
+    #[error("This payment has already been claimed by someone")]
+    PaymentAlreadyClaimed,
+
+    #[error("Error while verifying ed25519 signature - {0}")]
+    VerificationError(#[from] VerificationError),
+
+    #[error("The payment is not properly signed")]
+    BadSignature,
+}
@@ -0,0 +1,102 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+mod error;
+mod queries;
+mod storage;
+mod support;
+mod transactions;
+
+use cosmwasm_std::{
+    entry_point, to_binary, Deps, DepsMut, Env, MessageInfo, QueryResponse, Response,
+};
+
+use crate::error::ContractError;
+use erc20_bridge_contract::msg::{ExecuteMsg, InstantiateMsg, MigrateMsg, QueryMsg};
+
+/// Instantiate the contract.
+///
+/// `deps` contains Storage, API and Querier
+/// `env` contains block, message and contract info
+/// `msg` is the contract initialization message, sort of like a constructor call.
+#[entry_point]
+pub fn instantiate(
+    _deps: DepsMut,
+    _env: Env,
+    _info: MessageInfo,
+    _msg: InstantiateMsg,
+) -> Result<Response, ContractError> {
+    Ok(Response::default())
+}
+
+/// Handle an incoming message
+#[entry_point]
+pub fn execute(
+    deps: DepsMut,
+    env: Env,
+    info: MessageInfo,
+    msg: ExecuteMsg,
+) -> Result<Response, ContractError> {
+    match msg {
+        ExecuteMsg::LinkPayment { data } => transactions::link_payment(deps, env, info, data),
+    }
+}
+
+#[entry_point]
+pub fn query(deps: Deps, _env: Env, msg: QueryMsg) -> Result<QueryResponse, ContractError> {
+    let query_res = match msg {
+        QueryMsg::GetPayments { start_after, limit } => {
+            to_binary(&queries::query_payments_paged(deps, start_after, limit)?)
+        }
+    };
+
+    Ok(query_res?)
+}
+
+#[entry_point]
+pub fn migrate(_deps: DepsMut, _env: Env, _msg: MigrateMsg) -> Result<Response, ContractError> {
+    Ok(Default::default())
+}
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+    use config::defaults::DENOM;
+    use cosmwasm_std::testing::{mock_dependencies, mock_env, mock_info};
+    use cosmwasm_std::{coins, from_binary};
+    use erc20_bridge_contract::payment::PagedPaymentResponse;
+
+    #[test]
+    fn initialize_contract() {
+        let mut deps = mock_dependencies(&[]);
+        let env = mock_env();
+        let msg = InstantiateMsg {};
+        let info = mock_info("creator", &[]);
+
+        let res = instantiate(deps.as_mut(), env.clone(), info, msg).unwrap();
+        assert_eq!(0, res.messages.len());
+
+        // payments should be empty after initialization
+        let res = query(
+            deps.as_ref(),
+            env.clone(),
+            QueryMsg::GetPayments {
+                start_after: None,
+                limit: Option::from(2),
+            },
+        )
+        .unwrap();
+        let page: PagedPaymentResponse = from_binary(&res).unwrap();
+        assert_eq!(0, page.payments.len()); // there are no payments in the list when it's just been initialized
+
+        // Contract balance should match what we initialized it as
+        assert_eq!(
+            coins(0, DENOM),
+            vec![deps
+                .as_ref()
+                .querier
+                .query_balance(env.contract.address, DENOM)
+                .unwrap()]
+        );
+    }
+}
@@ -0,0 +1,191 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use cosmwasm_std::{Deps, Order, StdResult};
+
+use crate::storage::payments_read;
+use erc20_bridge_contract::keys::PublicKey;
+use erc20_bridge_contract::payment::{PagedPaymentResponse, Payment};
+
+const PAYMENT_PAGE_MAX_LIMIT: u32 = 100;
+const PAYMENT_PAGE_DEFAULT_LIMIT: u32 = 50;
+
+/// Adds a 0 byte to terminate the `start_after` value given. This allows CosmWasm
+/// to get the succeeding key as the start of the next page.
+fn calculate_start_value<B: AsRef<[u8]>>(start_after: Option<B>) -> Option<Vec<u8>> {
+    start_after.as_ref().map(|identity| {
+        identity
+            .as_ref()
+            .iter()
+            .cloned()
+            .chain(std::iter::once(0))
+            .collect()
+    })
+}
+
+pub fn query_payments_paged(
+    deps: Deps,
+    start_after: Option<PublicKey>,
+    limit: Option<u32>,
+) -> StdResult<PagedPaymentResponse> {
+    let limit = limit
+        .unwrap_or(PAYMENT_PAGE_DEFAULT_LIMIT)
+        .min(PAYMENT_PAGE_MAX_LIMIT) as usize;
+    let start = calculate_start_value(start_after);
+
+    let payments = payments_read(deps.storage)
+        .range(start.as_deref(), None, Order::Ascending)
+        .take(limit)
+        .map(|res| res.map(|item| item.1))
+        .collect::<StdResult<Vec<Payment>>>()?;
+
+    let start_next_after = payments.last().map(|payment| payment.verification_key());
+
+    Ok(PagedPaymentResponse::new(payments, limit, start_next_after))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::storage::payments;
+    use crate::support::tests::helpers;
+    use std::convert::TryInto;
+
+    #[test]
+    fn payments_empty_on_init() {
+        let deps = helpers::init_contract();
+        let response = query_payments_paged(deps.as_ref(), None, Option::from(2)).unwrap();
+        assert_eq!(0, response.payments.len());
+    }
+
+    #[test]
+    fn payments_paged_retrieval_obeys_limits() {
+        let mut deps = helpers::init_contract();
+        let storage = deps.as_mut().storage;
+        let limit = 2;
+        for n in 0u32..10000 {
+            let bytes: Vec<u8> = std::iter::repeat(n.to_be_bytes())
+                .take(8)
+                .flatten()
+                .collect();
+            let verification_key = PublicKey::new(bytes.try_into().unwrap());
+            let payment = helpers::payment_fixture();
+            payments(storage)
+                .save(&verification_key.to_bytes(), &payment)
+                .unwrap();
+        }
+
+        let page1 = query_payments_paged(deps.as_ref(), None, Option::from(limit)).unwrap();
+        assert_eq!(limit, page1.payments.len() as u32);
+    }
+
+    #[test]
+    fn payments_paged_retrieval_has_default_limit() {
+        let mut deps = helpers::init_contract();
+        let storage = deps.as_mut().storage;
+        for n in 0u32..100 {
+            let bytes: Vec<u8> = std::iter::repeat(n.to_be_bytes())
+                .take(8)
+                .flatten()
+                .collect();
+            let verification_key = PublicKey::new(bytes.try_into().unwrap());
+            let payment = helpers::payment_fixture();
+            payments(storage)
+                .save(&verification_key.to_bytes(), &payment)
+                .unwrap();
+        }
+
+        // query without explicitly setting a limit
+        let page1 = query_payments_paged(deps.as_ref(), None, None).unwrap();
+
+        assert_eq!(PAYMENT_PAGE_DEFAULT_LIMIT, page1.payments.len() as u32);
+    }
+
+    #[test]
+    fn payments_paged_retrieval_has_max_limit() {
+        let mut deps = helpers::init_contract();
+        let storage = deps.as_mut().storage;
+        for n in 0u32..10000 {
+            let bytes: Vec<u8> = std::iter::repeat(n.to_be_bytes())
+                .take(8)
+                .flatten()
+                .collect();
+            let verification_key = PublicKey::new(bytes.try_into().unwrap());
+            let payment = helpers::payment_fixture();
+            payments(storage)
+                .save(&verification_key.to_bytes(), &payment)
+                .unwrap();
+        }
+
+        // query with a crazily high limit in an attempt to use too many resources
+        let crazy_limit = 1000;
+        let page1 = query_payments_paged(deps.as_ref(), None, Option::from(crazy_limit)).unwrap();
+
+        // we default to a decent sized upper bound instead
+        assert_eq!(PAYMENT_PAGE_MAX_LIMIT, page1.payments.len() as u32);
+    }
+
+    #[test]
+    fn payments_pagination_works() {
+        let key1 = PublicKey::new([1; 32]);
+        let key2 = PublicKey::new([2; 32]);
+        let key3 = PublicKey::new([3; 32]);
+        let key4 = PublicKey::new([4; 32]);
+
+        let mut deps = helpers::init_contract();
+        let payment = helpers::payment_fixture();
+        payments(&mut deps.storage)
+            .save(&key1.to_bytes(), &payment)
+            .unwrap();
+
+        let per_page = 2;
+        let page1 = query_payments_paged(deps.as_ref(), None, Option::from(per_page)).unwrap();
+
+        // page should have 1 result on it
+        assert_eq!(1, page1.payments.len());
+
+        // save another
+        payments(&mut deps.storage)
+            .save(&key2.to_bytes(), &payment)
+            .unwrap();
+
+        // page1 should have 2 results on it
+        let page1 = query_payments_paged(deps.as_ref(), None, Option::from(per_page)).unwrap();
+        assert_eq!(2, page1.payments.len());
+
+        payments(&mut deps.storage)
+            .save(&key3.to_bytes(), &payment)
+            .unwrap();
+
+        // page1 still has 2 results
+        let page1 = query_payments_paged(deps.as_ref(), None, Option::from(per_page)).unwrap();
+        assert_eq!(2, page1.payments.len());
+
+        // retrieving the next page should start after the last key on this page
+        let start_after = key2;
+        let page2 = query_payments_paged(
+            deps.as_ref(),
+            Option::from(start_after),
+            Option::from(per_page),
+        )
+        .unwrap();
+
+        assert_eq!(1, page2.payments.len());
+
+        // save another one
+        payments(&mut deps.storage)
+            .save(&key4.to_bytes(), &payment)
+            .unwrap();
+
+        let start_after = key2;
+        let page2 = query_payments_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.payments.len());
+    }
+}
@@ -0,0 +1,79 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use cosmwasm_std::Storage;
+use cosmwasm_storage::{bucket, bucket_read, Bucket, ReadonlyBucket};
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+
+use erc20_bridge_contract::payment::Payment;
+
+// buckets
+const PREFIX_PAYMENTS: &[u8] = b"payments";
+const PREFIX_STATUS: &[u8] = b"status";
+
+#[derive(Clone, Debug, Deserialize, PartialEq, Serialize, JsonSchema)]
+pub enum Status {
+    Unchecked,
+    Checked,
+    Spent,
+}
+
+pub fn payments(storage: &mut dyn Storage) -> Bucket<Payment> {
+    bucket(storage, PREFIX_PAYMENTS)
+}
+
+pub fn payments_read(storage: &dyn Storage) -> ReadonlyBucket<Payment> {
+    bucket_read(storage, PREFIX_PAYMENTS)
+}
+
+pub fn status(storage: &mut dyn Storage) -> Bucket<Status> {
+    bucket(storage, PREFIX_STATUS)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::support::tests::helpers;
+    use cosmwasm_std::testing::MockStorage;
+    use erc20_bridge_contract::keys::PublicKey;
+
+    #[test]
+    fn payments_single_read_retrieval() {
+        let mut storage = MockStorage::new();
+        let key1 = PublicKey::new([1; 32]);
+        let key2 = PublicKey::new([2; 32]);
+        let payment1 = helpers::payment_fixture();
+        let payment2 = helpers::payment_fixture();
+        payments(&mut storage)
+            .save(key1.as_ref(), &payment1)
+            .unwrap();
+        payments(&mut storage)
+            .save(key2.as_ref(), &payment2)
+            .unwrap();
+
+        let res1 = payments_read(&storage).load(key1.as_ref()).unwrap();
+        let res2 = payments_read(&storage).load(key2.as_ref()).unwrap();
+        assert_eq!(payment1, res1);
+        assert_eq!(payment2, res2);
+    }
+
+    #[test]
+    fn status_single_read_retrieval() {
+        let mut storage = MockStorage::new();
+        let key1 = PublicKey::new([1; 32]);
+        let key2 = PublicKey::new([2; 32]);
+        let status_value = Status::Unchecked;
+        status(&mut storage)
+            .save(key1.as_ref(), &status_value)
+            .unwrap();
+        status(&mut storage)
+            .save(key2.as_ref(), &status_value)
+            .unwrap();
+
+        let res1 = status(&mut storage).load(key1.as_ref()).unwrap();
+        assert_eq!(status_value, res1);
+        let res2 = status(&mut storage).load(key2.as_ref()).unwrap();
+        assert_eq!(status_value, res2);
+    }
+}
@@ -0,0 +1,3 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+pub mod tests;
@@ -0,0 +1,28 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+#[cfg(test)]
+pub mod helpers {
+    use crate::instantiate;
+    use cosmwasm_std::testing::{mock_dependencies, mock_env, mock_info, MockApi, MockQuerier};
+    use cosmwasm_std::{Empty, MemoryStorage, OwnedDeps};
+    use erc20_bridge_contract::keys::PublicKey;
+    use erc20_bridge_contract::msg::InstantiateMsg;
+    use erc20_bridge_contract::payment::Payment;
+
+    pub fn init_contract() -> OwnedDeps<MemoryStorage, MockApi, MockQuerier<Empty>> {
+        let mut deps = mock_dependencies(&[]);
+        let msg = InstantiateMsg {};
+        let env = mock_env();
+        let info = mock_info("creator", &[]);
+        instantiate(deps.as_mut(), env.clone(), info, msg).unwrap();
+        return deps;
+    }
+
+    pub fn payment_fixture() -> Payment {
+        let public_key = PublicKey::new([1; 32]);
+        let gateway_identity = PublicKey::new([2; 32]);
+        let bandwidth = 42;
+        Payment::new(public_key, gateway_identity, bandwidth)
+    }
+}
@@ -0,0 +1,146 @@
+// Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
+// SPDX-License-Identifier: Apache-2.0
+
+use cosmwasm_std::{DepsMut, Env, MessageInfo, Response};
+
+use crate::error::ContractError;
+use crate::storage::{payments, status, Status};
+use erc20_bridge_contract::payment::{LinkPaymentData, Payment};
+
+pub(crate) fn link_payment(
+    deps: DepsMut,
+    _env: Env,
+    _info: MessageInfo,
+    data: LinkPaymentData,
+) -> Result<Response, ContractError> {
+    let mut status_bucket = status(deps.storage);
+
+    let verification_key = data.verification_key.to_bytes();
+    let gateway_identity = data.gateway_identity.to_bytes();
+    let message: Vec<u8> = verification_key
+        .iter()
+        .chain(gateway_identity.iter())
+        .copied()
+        .collect();
+    let signature = data.signature.to_bytes();
+
+    if let Ok(Some(_)) = status_bucket.may_load(&verification_key) {
+        return Err(ContractError::PaymentAlreadyClaimed);
+    }
+
+    if !deps
+        .api
+        .ed25519_verify(&message, &signature, &verification_key)?
+    {
+        return Err(ContractError::BadSignature);
+    }
+
+    status_bucket.save(&verification_key, &Status::Unchecked)?;
+    payments(deps.storage).save(
+        &verification_key,
+        &Payment::new(data.verification_key, data.gateway_identity, data.bandwidth),
+    )?;
+
+    Ok(Response::default())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::storage::payments_read;
+    use crate::support::tests::helpers;
+    use cosmwasm_std::testing::{mock_env, mock_info};
+    use erc20_bridge_contract::keys::PublicKey;
+
+    #[test]
+    fn bad_signature_payment() {
+        let mut deps = helpers::init_contract();
+        let env = mock_env();
+        let info = mock_info("owner", &[]);
+
+        let payment_data = LinkPaymentData::new([1; 32], [2; 32], 42, [3; 64]);
+
+        assert_eq!(
+            link_payment(deps.as_mut(), env, info, payment_data),
+            Err(ContractError::BadSignature)
+        );
+    }
+
+    #[test]
+    fn good_payment() {
+        let mut deps = helpers::init_contract();
+        let env = mock_env();
+        let info = mock_info("owner", &[]);
+
+        let verification_key = [
+            78, 142, 213, 13, 39, 169, 76, 205, 242, 206, 129, 208, 190, 51, 139, 206, 245, 199,
+            120, 151, 181, 250, 192, 153, 123, 104, 129, 139, 60, 254, 243, 98,
+        ];
+        let gateway_identity = [
+            106, 76, 76, 238, 214, 177, 233, 112, 56, 33, 21, 201, 89, 42, 69, 196, 175, 56, 6,
+            110, 184, 167, 203, 63, 1, 167, 134, 102, 165, 215, 3, 212,
+        ];
+        let bandwidth = 42;
+        let signature = [
+            200, 134, 156, 198, 113, 180, 129, 90, 70, 28, 176, 201, 35, 208, 145, 28, 15, 16, 9,
+            110, 148, 188, 193, 75, 157, 201, 206, 211, 128, 215, 66, 207, 175, 155, 48, 24, 171,
+            254, 9, 37, 108, 205, 143, 37, 77, 189, 162, 52, 44, 130, 173, 60, 220, 22, 193, 3,
+            111, 90, 123, 147, 206, 8, 137, 1,
+        ];
+
+        let payment_data =
+            LinkPaymentData::new(verification_key, gateway_identity, bandwidth, signature);
+
+        assert!(link_payment(deps.as_mut(), env, info, payment_data).is_ok());
+
+        assert_eq!(
+            payments_read(&deps.storage)
+                .load(&verification_key)
+                .unwrap(),
+            Payment::new(
+                PublicKey::new(verification_key),
+                PublicKey::new(gateway_identity),
+                bandwidth
+            )
+        );
+        assert_eq!(
+            status(&mut deps.storage).load(&verification_key).unwrap(),
+            Status::Unchecked
+        )
+    }
+
+    #[test]
+    fn double_spend_protection() {
+        let mut deps = helpers::init_contract();
+        let env = mock_env();
+        let info = mock_info("owner", &[]);
+
+        let verification_key = [
+            78, 142, 213, 13, 39, 169, 76, 205, 242, 206, 129, 208, 190, 51, 139, 206, 245, 199,
+            120, 151, 181, 250, 192, 153, 123, 104, 129, 139, 60, 254, 243, 98,
+        ];
+        let gateway_identity = [
+            106, 76, 76, 238, 214, 177, 233, 112, 56, 33, 21, 201, 89, 42, 69, 196, 175, 56, 6,
+            110, 184, 167, 203, 63, 1, 167, 134, 102, 165, 215, 3, 212,
+        ];
+        let bandwidth = 42;
+        let signature = [
+            200, 134, 156, 198, 113, 180, 129, 90, 70, 28, 176, 201, 35, 208, 145, 28, 15, 16, 9,
+            110, 148, 188, 193, 75, 157, 201, 206, 211, 128, 215, 66, 207, 175, 155, 48, 24, 171,
+            254, 9, 37, 108, 205, 143, 37, 77, 189, 162, 52, 44, 130, 173, 60, 220, 22, 193, 3,
+            111, 90, 123, 147, 206, 8, 137, 1,
+        ];
+
+        let payment_data =
+            LinkPaymentData::new(verification_key, gateway_identity, bandwidth, signature);
+
+        link_payment(deps.as_mut(), env.clone(), info.clone(), payment_data).unwrap();
+
+        // Only the verification key is used for double spending protection, the other data is irrelevant
+        let second_payment_data = LinkPaymentData::new(verification_key, [1; 32], 10, [2; 64]);
+        assert_eq!(
+            link_payment(deps.as_mut(), env, info, second_payment_data),
+            Err(ContractError::PaymentAlreadyClaimed)
+        )
+    }
+}
@@ -0,0 +1 @@
+.envrc
@@ -49,3 +49,4 @@ thiserror = { version = "1.0.23" }

 [dev-dependencies]
 cosmwasm-schema = { version = "0.14.0" }
+fixed = "1.1"
@@ -1,54 +1,46 @@
 // Copyright 2021 - Nym Technologies SA <contact@nymtech.net>
 // SPDX-License-Identifier: Apache-2.0

-use crate::helpers::calculate_epoch_reward_rate;
+use std::u128;
+
 use crate::state::State;
 use crate::storage::{config, layer_distribution};
 use crate::{error::ContractError, queries, transactions};
-use config::defaults::NETWORK_MONITOR_ADDRESS;
+use config::defaults::REWARDING_VALIDATOR_ADDRESS;
 use cosmwasm_std::{
-    entry_point, to_binary, Addr, Decimal, Deps, DepsMut, Env, MessageInfo, QueryResponse,
-    Response, Uint128,
+    entry_point, to_binary, Addr, Deps, DepsMut, Env, MessageInfo, QueryResponse, Response, Uint128,
 };
 use mixnet_contract::{ExecuteMsg, InstantiateMsg, MigrateMsg, QueryMsg, StateParams};

-pub const INITIAL_DEFAULT_EPOCH_LENGTH: u32 = 2;
-
 /// Constant specifying minimum of coin required to bond a gateway
 pub const INITIAL_GATEWAY_BOND: Uint128 = Uint128(100_000000);

 /// 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_REWARDED_SET_SIZE: u32 = 200;
 pub const INITIAL_MIXNODE_ACTIVE_SET_SIZE: u32 = 100;

-fn default_initial_state(owner: Addr) -> 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);
+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;

+// We'll be assuming a few more things, profit margin and cost function. Since we don't have reliable 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 {
    State {
        owner,
-        network_monitor_address: Addr::unchecked(NETWORK_MONITOR_ADDRESS), // we trust our hardcoded value
+        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,
+            mixnode_rewarded_set_size: INITIAL_MIXNODE_REWARDED_SET_SIZE,
            mixnode_active_set_size: INITIAL_MIXNODE_ACTIVE_SET_SIZE,
        },
-        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,
-        ),
+        rewarding_interval_starting_block: env.block.height,
+        latest_rewarding_interval_nonce: 0,
+        rewarding_in_progress: false,
    }
 }

@@ -60,11 +52,11 @@ fn default_initial_state(owner: Addr) -> State {
 #[entry_point]
 pub fn instantiate(
    deps: DepsMut,
-    _env: Env,
+    env: Env,
    info: MessageInfo,
    _msg: InstantiateMsg,
 ) -> Result<Response, ContractError> {
-    let state = default_initial_state(info.sender);
+    let state = default_initial_state(info.sender, env);

    config(deps.storage).save(&state)?;
    layer_distribution(deps.storage).save(&Default::default())?;
@@ -91,15 +83,39 @@ pub fn execute(
        ExecuteMsg::UpdateStateParams(params) => {
            transactions::try_update_state_params(deps, info, params)
        }
-        ExecuteMsg::RewardMixnode { identity, uptime } => {
-            transactions::try_reward_mixnode(deps, env, info, identity, uptime)
-        }
+        ExecuteMsg::RewardMixnodeV2 {
+            identity,
+            params,
+            rewarding_interval_nonce,
+        } => transactions::try_reward_mixnode_v2(
+            deps,
+            env,
+            info,
+            identity,
+            params,
+            rewarding_interval_nonce,
+        ),
        ExecuteMsg::DelegateToMixnode { mix_identity } => {
            transactions::try_delegate_to_mixnode(deps, env, info, mix_identity)
        }
        ExecuteMsg::UndelegateFromMixnode { mix_identity } => {
            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),
+        ExecuteMsg::FinishMixnodeRewarding {
+            rewarding_interval_nonce,
+        } => transactions::try_finish_mixnode_rewarding(deps, info, rewarding_interval_nonce),
+        ExecuteMsg::RewardNextMixDelegators {
+            mix_identity,
+            rewarding_interval_nonce,
+        } => transactions::try_reward_next_mixnode_delegators_v2(
+            deps,
+            info,
+            mix_identity,
+            rewarding_interval_nonce,
+        ),
    }
 }

@@ -119,6 +135,9 @@ pub fn query(deps: Deps, _env: Env, msg: QueryMsg) -> Result<QueryResponse, Cont
            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 {
            mix_identity,
@@ -151,11 +170,22 @@ pub fn query(deps: Deps, _env: Env, msg: QueryMsg) -> Result<QueryResponse, Cont
            mix_identity,
            address,
        )?),
+        QueryMsg::GetRewardPool {} => to_binary(&queries::query_reward_pool(deps)),
+        QueryMsg::GetCirculatingSupply {} => to_binary(&queries::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(&queries::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())
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Mark Sinclair	4ca8cdcf5a	Testing CI	2021-11-24 18:01:32 +00:00
Aid19801	c8f2548090	Merge pull request #915 from nymtech/fix-mob-datagrids Fix Mobile View for MUI data-grid (CARD 108)	2021-11-24 13:28:36 +00:00
Aid Thompson	62f20a905e	Alignment on Overview page	2021-11-24 10:45:54 +00:00
Jędrzej Stuczyński	a3dd94507a	Feature/total delegation bucket (#913 ) * Preliminary attempt at creating StoredMixnodeBond * Fixed tests * Removed dead code * Moved StoredMixnodeBond to storage.rs * Removed redundant clone	2021-11-23 16:36:48 +00:00
Aid Thompson	dd36b329d5	renamed back to universal-datagrid	2021-11-23 16:03:39 +00:00
Aid Thompson	581af4a295	gateways page performant	2021-11-23 15:49:05 +00:00
Jędrzej Stuczyński	085761a9fb	Feature/batch delegator rewarding (#898 ) * Unnrolled the loop into separate function * Ugly way of saving rewarding status * Initial way of rewarding next page of delegators * Attribute passing * Promoted transactions to directory * Moved rewarding-related functionalities into separate file * [ci skip] Generate TS types * Better errors on double rewarding attempt * Removed old rewarding call * Test fixes * Some cleanup * Paged mixnode rewarding test + serde fixes * Tests for delegator rewarding * ExecuteMsg for MixDelegatorRewarding * Made validator-api code compliable with bunch of todo!() macros * Removed Option wrapper from params in MixnodeToReward * Calculating uptime for entire epoch * Created shared MIXNODE_DELEGATORS_PAGE_LIMIT constant * Using new rewarding messages in validator API * cargo fmt * Updated wallet state types * Additional test for correct rewarding information * Query for rewarding status * Additional test regarding delegator rewarding * Client methods for obtaining rewarding status * Validator API checking for full rewarding * Removed unused field from validator api config template * Waiting for MINIMUM number of test routes * Waiting initialisation_backoff in the early return case * Fixes crash condition in validator API when calculating last day uptime * Fixed typo * Dealing with the case of rewarding mixnode with 0 uptime * Removed temporary unwrap * Guarding against 0-size rewarded/active sets Co-authored-by: jstuczyn <jstuczyn@users.noreply.github.com>	2021-11-23 15:36:20 +00:00
Aid Thompson	58537224df	mixnode datagrid performant	2021-11-23 15:20:23 +00:00
Jędrzej Stuczyński	78a5dbbf05	Fixes crash condition in validator API when calculating last day uptime (#909 )	2021-11-23 14:47:49 +00:00
AniaPiotrowska	ab7f24dc1f	Merge pull request #837 from nymtech/feature/vouchers Feature/vouchers	2021-11-22 19:34:58 +00:00
Jędrzej Stuczyński	289605f36b	Bugfix/monitor initial values wait (#907 ) * Waiting for MINIMUM number of test routes * Waiting initialisation_backoff in the early return case	2021-11-18 17:16:15 +00:00
Tommy Verrall	4f6bf3423b	Merge pull request #905 from nymtech/update/readme Update README.md	2021-11-18 09:59:55 +00:00
Tommy Verrall	04a32156d4	Merge pull request #891 from nymtech/update/remove-gateway-delegations remove delegation and undelegation from gateways	2021-11-18 09:42:34 +00:00
Tommy Verrall	427880d23f	Merge pull request #896 from nymtech/bug-fix/macos-keyboard-shortcuts Bug fix/macos keyboard shortcuts	2021-11-18 09:22:33 +00:00
Tommy Verrall	a5e47dead8	Update readme . If `Webview2` is not installed on Windows, that app will not launch correctly. There's two ways to update if you're running on an older version of windows. - Update the Edge browser in your current OS - Update via the installer now provided in the README documentation.	2021-11-18 09:18:04 +00:00
Tommy Verrall	297b7b2355	Merge pull request #904 from nymtech/bug-bond-denom BUG: Bond cell denom	2021-11-17 12:30:45 +00:00
Tommy Verrall	d7f3abfe7d	Merge pull request #903 from nymtech/test/fix-detail-tables Explorer UI tests missing data-testid	2021-11-17 12:29:34 +00:00
Aid Thompson	234952a6bb	removed typo	2021-11-17 11:50:03 +00:00
Tommy Verrall	930561faf5	Explorer UI tests . This `data-testid` was missing and is needed after changes to DataGrid into MUI-Table	2021-11-17 11:20:43 +00:00
Tommy Verrall	17507bc8c5	Merge pull request #899 from nymtech/test/wallet-readme-fix Fix up Nym-Wallet README.md	2021-11-16 14:17:15 +00:00
Tommy Verrall	12f8e453ea	Fix typo.	2021-11-16 10:20:50 +00:00
Tommy Verrall	97ef024b8a	Fix up Nym-Wallet README.md . Provide a descriptive overview . Remove old references	2021-11-16 10:17:30 +00:00
Aid19801	3dc94223ae	Bug mapp nodemap (#897 ) * desktop onMouseEnter and leave handlers added * clicking nav option closes drawer * All AC met * removed dead bool * added hamburger to AppBar for mobile users small refactor * nuts and bolts working needs a lot of tidying though * Functionally complete. * change hardcode colors to theming * UI theme and border changes * bug fix removed collapse nav flicker * dead code * resetting drawer to closed onload * removal of hardcoded color * made null functions into optional props * Nested sx styling not global * paperprops now working * fixed breaking changes for DataGrid * linting fix * linting fix * optional chaining for nodemap search * leaner filter func Co-authored-by: Aid Thompson <adrian@nymtech.net>	2021-11-12 18:22:03 +00:00
Aid19801	50cd18a926	Add a Mobile Nav to the Network Explorer (#895 ) * desktop onMouseEnter and leave handlers added * clicking nav option closes drawer * All AC met * removed dead bool * added hamburger to AppBar for mobile users small refactor * nuts and bolts working needs a lot of tidying though * Functionally complete. * change hardcode colors to theming * UI theme and border changes * bug fix removed collapse nav flicker * dead code * resetting drawer to closed onload * removal of hardcoded color * made null functions into optional props * Nested sx styling not global * paperprops now working * fixed breaking changes for DataGrid * linting fix * linting fix Co-authored-by: Aid Thompson <adrian@nymtech.net>	2021-11-12 16:14:37 +00:00
Tommy	e5051f98c5	Adding a few more menu options	2021-11-12 11:23:36 +00:00
fmtabbara	2f69958e21	macos keyboard shortcut fix	2021-11-12 10:29:49 +00:00
fmtabbara	d427591a66	dont commite dist folder contents	2021-11-12 10:29:33 +00:00
fmtabbara	0257c42ee9	update tauri bundle identifier	2021-11-12 10:29:04 +00:00
fmtabbara	8ebfc72da8	remove contents of dist folder	2021-11-12 10:28:39 +00:00
Aid19801	897d51cba0	Change MixnodeDetail page's datagrid into a reuseable table component (#887 ) * basic table working * broken out into sep component * table is more dynamic now * linting fixes * Added types for Columns * hangover from eslint work moving to diff PR * Changed To DetailTable * Killed unused flex val in Columns * merge conflicts resolved Co-authored-by: Aid Thompson <adrian@nymtech.net>	2021-11-12 10:28:12 +00:00
Tommy Verrall	1f1d91bd1e	Adding data-test-ids for the explorer (#885 ) * Adding all the data-test-ids Test ID's for doing automation on explorer * Applied lint-fix Linting * More data ids	2021-11-11 15:31:30 +00:00
Mark Sinclair	9d63a30b07	Merge pull request #890 from nymtech/feature/nym-wallet-rename Feature/nym wallet rename	2021-11-11 15:00:55 +00:00
Tommy	5b22b1c298	getting branch up to date with tauri changes and webriver changes	2021-11-11 11:02:39 +00:00
Dave Hrycyszyn	0302d9ae5d	Merge branch 'feature/nym-wallet-rename' of github.com:nymtech/nym into feature/nym-wallet-rename	2021-11-11 10:50:12 +00:00
Bogdan-Ștefan Neacşu	eb6949528a	Fix network monitor template (#892 )	2021-11-11 10:36:43 +00:00
Mark Sinclair	41b77c3ad5	Merge pull request #894 from nymtech/feature-gate-ts-rs Only use ts-rs in tests	2021-11-11 10:34:04 +00:00
Mark Sinclair	2f78f5eb26	Merge pull request #884 from nymtech/test/fix-gh-action Fix path for github action running tauri-wallet-tests	2021-11-11 10:33:02 +00:00
Dave Hrycyszyn	cdbd731f10	Changed all workflow references to nym-wallet	2021-11-11 10:25:51 +01:00
Dave Hrycyszyn	5cb4949d46	Renaming tauri-wallet to nym-wallet Hopefully this will make it a bit clearer as to what people should compile if they want the wallet.	2021-11-11 10:25:51 +01:00
Mark Sinclair	9ec0b30812	GitHub Actions: move explorer actions to k8s hosted runners	2021-11-10 16:08:15 +00:00
Jędrzej Stuczyński	7e1cf2f105	Feature/rewarding interval updates (#880 ) * Introduced rewarding_interval_nonce to contract state * Queries for ibid. * Mixnode demanded set size * Routes for obtaining demanded/active mixnode sets * Testing only demanded nodes * Typo * Initial state * Feature-locking unused imports * Generating pseudorandom (with deterministic seed) demanded mixnodes set * cargo fmt * Fixed tauri state * Renamed network monitor address to the rewarding validator * [ci skip] Generate TS types * Notice for the future * Transactions to begin/finish mixnode rewarding + double rewarding protection * Validator API using new contract calls * Removed dead code from an old experiment * [ci skip] Generate TS types * Removed unused import * Renamed 'demanded' set to 'rewarded' set * Some renaming action * [ci skip] Generate TS types * Fixed post-merge dependency issue in tests * Post merge test fix Co-authored-by: jstuczyn <jstuczyn@users.noreply.github.com>	2021-11-10 15:28:16 +00:00
Mark Sinclair	04636a569a	GitHub Actions: fix up reference to action	2021-11-10 15:24:47 +00:00
Mark Sinclair	52f5b980a4	GitHub Actions: use dynamic matrix for os types and rust versions	2021-11-10 15:15:31 +00:00
Mark Sinclair	0e4f833715	GitHub Actions: fix up	2021-11-10 14:44:52 +00:00
Mark Sinclair	d22914c4dc	GitHub Actions: fix up	2021-11-10 14:43:32 +00:00
Mark Sinclair	7d506e6e2a	Slim down GitHub Actions	2021-11-10 14:34:02 +00:00
Drazen Urch	c7007de1ea	Only use ts-rs in tests	2021-11-10 15:02:59 +01:00
Bogdan-Ștefan Neacşu	10bf70b22b	Feature/bandwidth token (#832 ) * Remove check for bandwidth for incoming packets We should only accunt for packets that the client inputs to the mixnet * Introduce BandwidthController for both types of bandwidth creds * Add some non-coconut token bandwidth handling * Use thiserror for gateway-client lib * Add error handling * Unable to build for wasm for now * Fix wasm strange error * Disable non-coconut credentials for wasm client * Check for status and throw the error up * Send encrypted token cred from client * Gateway receive message and signature validation * Put the correct amount of tokens that were burned * [ci skip] Generate TS types * Eth endpoint and secret key as config parameters * Add eth_endpoint config argument for gateway * Update test as well * Separate panicable code from the safe one * Move some bandwidth controller panics up the call stack * Save contract corresponding to the eth endpoint * Fix template * Pass the web3 interface as well * Made event reads possible in gateway * Add checks for event data * Cosmos contract for double spending prevention * Add workflow for the new contract * Add validator rest URL to config * Rename eth_events to erc20_bridge * Pass cosmos mnemonic as well, and put the nymd client in ERC20Bridge * Call cosmos contract for final verification * Ask for config parameters in cli * Fix various stuff * Increase timeout to allow gateway to check the two chains * Put some logs for the new flow * Set consumed bandwidth invariantly of coconut feature * Fix clippy error * Add non-coconut checks * Use 2018 rust instead of 2021 * More verbose nymd error * Explicitly specify TOKENS_TO_BURN constant * Put eth burn function in a constant * Replace to_vec & append with iter & chain * Test for (de)serialization of TokenCredential * Minor rename * Separate credential creation from bandwidth claiming * Switch from panics to errors when claiming coconut bandwidth * Another append changed to chain * Update QA cosmos contract address * Simplify build/test/clippy separation on coconut feature * Fix bad features arg positioning * Use the start_after in cosmos contract query * Set a limit in line with a range on cosmos queries * Added unit tests for new cosmos contract * Fix bandwidth_remaining comparation * Get remaining bandwidth from gateway * Add contract build flag * Add a useful info log * Use a more robust eth depth for release builds * Include recipt logs in error message * Fix clippy for tests * Use Arc instead of clone * Rename as_bytes to to_bytes * Make signature verification in contract more verbose * Missed rename of paging constant * Fix gateway start with coconut enabled * Rename function to claim_token * Simplify nymd client setup * Check with block buffer on gateway as well * Update comment of double spending protection * Correct contract address * Backup the keypairs used for buying tokens, in case of error cases * Don't take any chances with the gateway timeout * [ci skip] Generate TS types * Updated cosmos contract to latest QA address * Add cli options for eth * Update network monitor timeout value as well Co-authored-by: neacsu <neacsu@users.noreply.github.com>	2021-11-10 14:53:56 +02:00
Jędrzej Stuczyński	d952f3233a	Active sets => Rewarded + Active/Idle sets (#864 ) * Introduced rewarding_interval_nonce to contract state * Queries for ibid. * Mixnode demanded set size * Routes for obtaining demanded/active mixnode sets * Testing only demanded nodes * Typo * Initial state * Feature-locking unused imports * Generating pseudorandom (with deterministic seed) demanded mixnodes set * cargo fmt * Fixed tauri state * [ci skip] Generate TS types * Renamed 'demanded' set to 'rewarded' set * Some renaming action * [ci skip] Generate TS types * Fixed post-merge dependency issue in tests Co-authored-by: jstuczyn <jstuczyn@users.noreply.github.com>	2021-11-10 12:52:13 +00:00
fmtabbara	b1178b7ad5	remove delegation and undelegation from gateways	2021-11-10 10:42:45 +00:00
Jędrzej Stuczyński	af4ac1b7c9	Reverted gateway registration handshake to its 0.11.0 version (#882 )	2021-11-10 11:16:39 +01:00
Drazen Urch	eae4276381	Tokenomics rewards (#802 ) * Initial analysis * Implement core rewards distribution * Tests and refactoring for better testability * Feature gate ts-rs in mixnet-contract * No more floats * Fix performance calculation * Add migration * Bandwidth fix, reduce inflation pool size * Update tokenomics * Refactor rewarding and replace num crate * Address review comments * Cleanup, better test values * Simplify formula * Cleanup, add rewarding formulas to README * Address review comments * Cleanup rebase * [ci skip] Generate TS types * fmt Co-authored-by: Drazen Urch <durch@users.noreply.guthub.com>	2021-11-10 11:14:06 +01:00
Dave Hrycyszyn	d8fab74df6	Changed all workflow references to nym-wallet	2021-11-09 17:04:07 +00:00
Dave Hrycyszyn	b8c184cc60	Renaming tauri-wallet to nym-wallet Hopefully this will make it a bit clearer as to what people should compile if they want the wallet.	2021-11-09 16:55:49 +00:00
Tommy	4ed9d3a297	Updated rust version for installation	2021-11-08 14:55:49 +00:00
Tommy	97dee2e1a0	Fix path for github action running tauri-wallet-tests . Applied prettier to the code base . Removed delegation to gateway tests	2021-11-08 14:54:01 +00:00