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Grim never lets a field default to constant focus. Its TextEdit defaults to focus = true, which means an unfocused field calls request_focus() EVERY frame. Grim's own usage always overrides this — every field is .focus(false) (focus only on tap), and at most one gets .focus(first_draw) to grab focus once when a screen opens (see grim wallets/modals/add.rs). Goblin's converted fields skipped this, so all ~16 fields requested focus each frame and fought each other on multi-field screens (wallet setup, import, rotate). Set every field to .focus(false) to match Grim exactly: fields now focus on tap and bring up the native keyboard, with no thrash. The native IME path itself is already identical to Grim (verified: edit.rs differs only by additive display builders; MainActivity onTextInput JNI plumbing is byte-for-byte Grim; android/winit/eframe/egui/jni deps match).
Goblin
Goblin is a private, Cash App-style wallet for GRIN ツ — confidential digital cash on Mimblewimble, 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 and Tor. Relays only ever see ciphertext — never the amount, the sender, or the recipient.
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.
What it does
- Send to people — pay a
@usernameornpub; 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 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.
How a payment travels
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/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
Install the Android SDK / NDK, then from the repo root:
./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. 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
Apache License v2.0.
Credits
🤖 Built with AI pair-programming assistance (Claude)
The underlying cross-platform GRIN wallet engine is the upstream Grim project.