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-# Grim 
-Cross-platform GUI for [GRiN ツ](https://grin.mw) in [Rust](https://www.rust-lang.org/)
-for maximum compatibility with original [Mimblewimble](https://github.com/mimblewimble/grin) implementation.
-Initially supported platforms are Linux, Mac, Windows, limited Android and possible web support with help of [egui](https://github.com/emilk/egui) - immediate mode GUI library in pure Rust.
+
+ 
+
-Named by the character [Grim](http://harrypotter.wikia.com/wiki/Grim) - the shape of a large, black, menacing, spectral giant dog.
+# Goblin
-
+Goblin is a private, Cash App-style wallet for [GRIN ツ](https://grin.mw) — confidential digital cash on [Mimblewimble](https://github.com/mimblewimble/grin), with no amounts or addresses on the chain.
+Instead of passing slatepack files back and forth, you **pay a `@username` (or an `npub`)** and the payment is delivered for you as an **end-to-end encrypted message over [nostr](https://github.com/nostr-protocol/nips) and Tor**. Relays only ever see ciphertext — never the amount, the sender, or the recipient.
-## Build instructions
-### Install Rust
+Goblin is a fork of the **Grim** egui GRIN wallet: it keeps Grim's full GRIN node/wallet engine and layers a Nostr-native, mobile-first payments experience on top.
-Follow instructions on [Windows](https://forge.rust-lang.org/infra/other-installation-methods.html).
+## What it does
-`curl https://sh.rustup.rs -sSf | sh`
+- **Send to people** — pay a `@username` or `npub`; the GRIN slatepack travels as a NIP-17 gift-wrapped DM (kind 1059) over Tor and is applied automatically by the recipient's wallet. No files to swap, no need to both be online at once.
+- **In-app identity** — a nostr payment key that is deliberately *not* part of your seed, so you can rotate it any time to stay unlinkable without touching your funds. An optional human-readable `@name` (and hosted avatar) comes from the goblin.st identity service.
+- **Private by construction** — GRIN's address-less, confidential chain; every relay and HTTP request routed through an embedded [arti](https://gitlab.torproject.org/tpo/core/arti) Tor client (webtunnel bridge by default); keys, names and history stay on your device.
+- **Configurable amount pairing** — show balances against a world currency, Bitcoin, or sats (rates fetched over Tor), or turn the preview off.
+- **Cross-platform** — Linux, macOS, Windows, Android, built in pure Rust on [egui](https://github.com/emilk/egui).
-### Desktop
+## How a payment travels
-To build and run application go to project directory and run:
+```
+ you ──slatepack──▶ NIP-17 gift wrap (kind 1059, NIP-44 encrypted)
+ │
+ arti / Tor
+ │
+ ┌─────────────┴─────────────┐
+ your relays recipient's DM relays (kind 10050)
+ └─────────────┬─────────────┘
+ ▼
+ recipient ◀──unwrap, verify seal author, apply slatepack
+```
+
+Both parties only need one relay in common. The default set is the Goblin relay plus large public relays (`relay.damus.io`, `nos.lol`), and the set is editable in **Settings → Relays**.
+
+## Build
+
+### Desktop (Linux / macOS / Windows)
```
git submodule update --init --recursive
cargo build --release
-./target/release/grim
+./target/release/goblin
```
+Tor's webtunnel bridge is built from Go at compile time — install Go first (e.g. `pacman -S go`). Without it the bundled bridge is inert and Tor will not bootstrap on networks that block direct Tor connections.
+
### Android
-#### Set up the environment
-Install Android SDK / NDK / Platform Tools for your OS according to this [FAQ](https://github.com/codepath/android_guides/wiki/installing-android-sdk-tools).
+Install the Android SDK / NDK, then from the repo root:
-#### Build the project
-Run Android emulator or connect a real device. Command `adb devices` should show at least one device.
-In the root of the repo run `./scripts/android.sh build|release v7|v8|x86`, where is `v7`, `v8`, `x86` - device CPU architecture for `build` type, for `release` specify version number in format `major.minor.patch`.
+```
+./scripts/android.sh build|release v7|v8|x86
+```
+
+`v7`/`v8`/`x86` is the device CPU architecture for `build`; for `release` pass a version in `major.minor.patch` form.
+
+## Identity service (`goblin-nip05d`)
+
+The optional `@name` + avatar service lives in `goblin-nip05d/` (axum + SQLite) and is deployed at [goblin.st](https://goblin.st). It implements NIP-05 resolution, NIP-98-authenticated registration/transfer/release, and a hardened avatar pipeline (magic-byte sniffing, bounded decode, full re-encode to a clean 256×256 PNG). The wallet is fully usable — and fully anonymous — without it.
## License
@@ -40,6 +66,6 @@ Apache License v2.0.
## Credits
-**Goblin** — the Cash App-style, Nostr-native payments experience layered on top of this wallet (end-to-end encrypted NIP-17 payments over Tor, in-app identity, and the goblin.st identity service) — was designed and built with development assistance from **Claude** ([Anthropic](https://www.anthropic.com)).
+**Goblin** — the Cash App-style, Nostr-native payments experience layered on top of this wallet — was designed and built by the project owner with development assistance from **Claude** ([Anthropic](https://www.anthropic.com)).
-The underlying cross-platform grin wallet is the upstream **Grim** project.
+The underlying cross-platform GRIN wallet engine is the upstream **Grim** project.