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README.md

npubcash-rust

A Rust implementation of the npub.cash v2 protocol for the pinned cdk-npubcash client. Cashu operations are delegated to CDK and Nostr operations to the Rust Nostr crates.

The first-release implementation targets CDK v0.18.0-rc.0. The compatibility contract and implementation decisions are in docs/contract/v2.md and docs/adr/0001-upstream-pins-and-operating-policy.md.

Development

nix develop
just quick-check

PostgreSQL is the sole application database. Start a local server, create a database, and export DATABASE_URL before running integration tests.

The flake provides an explicit runnable app:

nix run .# -- --version

Running the service requires PostgreSQL, applied migrations, runtime secrets, a NUT-04/NUT-20-compatible mint, and at least one reachable Nostr relay. See docs/nixos-module.md for the recommended NixOS deployment, including automatic PostgreSQL provisioning and migrations.

See DEVELOPMENT.md for contributor workflows and OPERATIONS.md for configuration, secrets, backup, monitoring, upgrades, and rollback.