JoinMarket NG vs Reference Implementation

JoinMarket NG is an alternative implementation of the JoinMarket protocol.

It keeps wire-level compatibility with the reference implementation while using a modern codebase and tooling.

What Is Different

• no long-lived JoinMarket daemon model for normal maker/taker CLI usage
• modern Python stack (Python 3.11+, AsyncIO, Pydantic v2, strict typing)
• built-in Neutrino backend support
• active compatibility testing against the reference ecosystem

Compatibility Model

JoinMarket NG uses protocol version 5 and negotiates optional capabilities via handshake features.

Example feature keys include:

• peerlist_features
• ping
• neutrino_compat

This allows gradual rollout without a network-wide protocol version bump.

Neutrino Interop Notes

• Neutrino takers require makers that advertise neutrino_compat
• Full-node takers can interact with both legacy and feature-advertising makers

See Protocol for details on feature negotiation and message format differences.