2ro
a7c2443f3b
Implements the Goblin-wallet half of the proof-on-request architecture (magick payment infra spec section 4/5): the buyer's wallet threads a native Grin payment proof per transaction, off by default and on only when the scanned pay URI asks for it, and auto-delivers the proof to the market and watcher on finalize. Person-to-person sends are unchanged. W1 pay-URI parser (payuri.rs): PayUri gains proof/order/notify, each fail-closed (a bad value drops to None and never blocks the payment). proof is a grin1/tgrin1 slatepack-address shape check, order is an opaque control-stripped routing key capped at 64 bytes, notify is an npub shape check. Unknown-param forward-compat and the magick interop tests still hold. 12 new parser tests. W2 proof threading: WalletTask::NostrSend carries proof/order/notify; the handler re-parses proof authoritatively into a SlatepackAddress and calls w.send(a, Some(addr)) instead of the hard-coded None, setting payment_proof_recipient_address. The order handle, watcher npub, and amount persist in TxNostrMeta (new serde-default fields) before dispatch, so a crash between send and finalize loses nothing. W3 review indicator: the send-review screen shows a small "proof included" row when proof mode is active. New t!() keys row_proof / row_proof_val in all six locales (drift test green). W4 proof delivery on finalize: when a finalized SEND was sent in proof mode, the wallet publishes the two contract events: a plain unencrypted kind-17 "payment sent" receipt to the app relays (payment-request tag = order handle; proof and kernel deliberately omitted to avoid leaking the buyer's sender address; flips the page to "detected", never "paid"), and a NIP-59 gift-wrapped kind-17 rumor to the notify npub carrying the full proof JSON plus a kernel-excess tag. Both are enrolled in the existing crash-safe reconcile pass and retried until a relay accepts them. wrapv3 gains wrap_kind() to gift-wrap an arbitrary rumor kind. Matching is by the payment-request (invoice number) tag alone; the wallet never learns magick's internal orderId. No merchant-side auto-receipt is built: the rewritten spec has the buyer publish on finalize instead.
Goblin
Goblin is a private, pay-by-username 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, routed through Tor. Relays only ever see ciphertext - never the amount, the sender, or the recipient. Tor hides your IP from the relay; the relay and encryption hide the rest - content, sender, timing.
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. - Manual slatepacks too - when you need to pay or get paid without a handle, Settings → Wallet → Slatepacks exposes the classic by-hand flow: create a slatepack to send, or paste one to receive, finalize, or pay.
- 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
namecomes from the goblin.st identity service. - Private by construction - GRIN's address-less, confidential chain; your payments and identity (nostr relays, NIP-05 lookups, price) are routed through Tor, so who-pays-whom never touches the clear net. The GRIN node connection - block sync and broadcasting your transaction - is direct: public chain data, the same for everyone, and not tied to your identity. 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.
- News on Home - the latest post from the official Goblin news key (a kind 30023 long-form article) appears on the Home screen; it stays hidden when there is nothing to show, and only ever shows the newest article.
- 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)
│
Tor
│
┌─────────────┴─────────────┐
your relays recipient's DM relays (kind 10050)
└─────────────┬─────────────┘
▼
recipient ◀──unwrap, verify seal author, apply slatepack
The wrap is NIP-44-encrypted, and delivery uses the recipient's DM relay list (kind 10050). Tor hides your IP from the relay; the relay and the encryption above hide the rest - content, sender, timing.
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)
Goblin links Tor in-process via arti - the wallet is a single self-contained binary, no sidecar, nothing separate to install:
git submodule update --init --recursive
cargo build --release
./target/release/goblin
Goblin's identity and payment traffic (nostr relays, NIP-05 lookups and price fetches) rides Tor: every relay, the money-path relay included, is reached over a Tor exit to its ordinary clearnet host. The GRIN node connection (block sync and transaction broadcast) is not routed through Tor: it connects directly, as it carries only public chain data that isn't linked to your wallet.
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 service lives in goblin-nip05d/ (axum + SQLite) and is deployed at goblin.st. It implements NIP-05 resolution, NIP-98-authenticated registration and release (names are never transferred - on a key rotation you release the old name and re-register, or import your existing identity). The wallet is fully usable - and fully anonymous - without it. Avatars aren't stored or served - clients render them from the pubkey (an npub gradient with the username's first letter, else the Grin mark).
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.