api/middleware.rs: Bearer access-token extraction; client_ip() trusts XFF only behind config.trusted_proxies (fail-closed against spoofing). api/auth.rs: extension_register (PoW-gated; derivation-rotation requires a signature from the on-file key, no fingerprint hijack), check_restore (per-IP + per-fingerprint rate limits, enumeration/timing-resistant), pow_challenge, refresh_token (re-checks active session + revoke-then-issue rotation, race-safe), logout, get_me, nostr_login (login-grade NIP-98, never creates a user, bound to config public_api_url), nostr_link (JWT + state-change verify_signed_action, fail-closed nonce stub) + DTOs + routes(). Wired into api/mod.rs + nested at /api/v1 in main.rs; all 8 paths registered in ApiDoc so openapi.json covers the auth surface (was vacuous). Drafted+hardened via draft->adversarial-review->revise workflow; independently re-reviewed (no critical/high). 58 tests, all gates green. Known LOW (tracked): concurrent first-registration of the same new pubkey_hash can 500 instead of idempotent re-read; client-retryable.
smirk-backend-core
Open, self-hostable backend for the Smirk non-custodial, multi-chain wallet. It provides the chain-access and identity surface a Smirk wallet needs — authentication, per-chain wallet access (Bitcoin, Litecoin, Monero, Wownero, Grin), the Grin slatepack relay, and Nostr-based identity — so anyone can run their own backend and a Smirk wallet can connect to it.
Status: early, under active development. Interfaces and the database schema may change before the first tagged release. Not yet recommended for production self-hosting.
What it is
- Non-custodial. The server never holds spend keys or seeds. It brokers access to blockchain data and relays wallet-to-wallet messages.
- Open core, feature-flagged. Every feature ships in this codebase and is
toggled per deployment; the wallet reads
GET /api/v1/capabilitiesand adapts to what a given backend offers. - Identity via "Sign in with Smirk". Authentication uses a seed-derived Nostr key (NIP-98); the server stores only public keys.
- Privacy first. No PII is required to use it; operator and user privacy are explicit design goals.
Architecture
Rust + Axum, PostgreSQL via sqlx. The public HTTP contract is generated from the handlers with utoipa (OpenAPI), which in turn drives the wallet's generated TypeScript client — one source of truth, checked for drift in CI.
Quickstart
cp .env.example .env # then fill in DATABASE_URL, JWT_SECRET, node URLs
cargo run # starts the API server
A full self-hosting guide (node requirements, reverse proxy, Tor admin onion,
backups) will live in docs/ as it stabilises.
Security
Please report vulnerabilities privately — see SECURITY.md. Do not open public issues for security reports.
License
To be finalized (MIT vs AGPL-3.0-or-later). Until a LICENSE file is added,
all rights are reserved.