Claude
95403516d5
Replace the inherited Grim README with one that reflects what Goblin actually is: a private, Cash App-style GRIN wallet that pays @usernames via NIP-17 gift-wrapped DMs over Tor, with in-app nostr identity and the goblin.st identity service. Adds the Goblin banner, a payment-flow diagram, correct build instructions (binary is `goblin`), and keeps the Claude credit.
72 lines
3.9 KiB
Markdown
72 lines
3.9 KiB
Markdown
<p align="center">
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<img src="Goblin-Banner.png" alt="Goblin" width="680"/>
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</p>
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# Goblin
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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.
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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.
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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.
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## What it does
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- **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.
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- **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.
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- **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.
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- **Configurable amount pairing** — show balances against a world currency, Bitcoin, or sats (rates fetched over Tor), or turn the preview off.
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- **Cross-platform** — Linux, macOS, Windows, Android, built in pure Rust on [egui](https://github.com/emilk/egui).
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## How a payment travels
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```
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you ──slatepack──▶ NIP-17 gift wrap (kind 1059, NIP-44 encrypted)
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│
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arti / Tor
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│
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┌─────────────┴─────────────┐
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your relays recipient's DM relays (kind 10050)
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└─────────────┬─────────────┘
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▼
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recipient ◀──unwrap, verify seal author, apply slatepack
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```
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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**.
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## Build
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### Desktop (Linux / macOS / Windows)
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```
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git submodule update --init --recursive
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cargo build --release
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./target/release/goblin
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```
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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.
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### Android
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Install the Android SDK / NDK, then from the repo root:
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```
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./scripts/android.sh build|release v7|v8|x86
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```
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`v7`/`v8`/`x86` is the device CPU architecture for `build`; for `release` pass a version in `major.minor.patch` form.
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## Identity service (`goblin-nip05d`)
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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.
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## License
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Apache License v2.0.
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## Credits
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**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)).
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The underlying cross-platform GRIN wallet engine is the upstream **Grim** project.
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