JoinMarket is software designed to facilitate CoinJoin transactions on the Bitcoin network. It addresses the economic challenges of coordinating participants to securely mix funds for enhanced privacy. Specifically, it creates a market where market makers and takers interact, incentivized by fees paid by takers. The core implementation utilizes a smart contract-like system to protect private keys.
JoinMarket distinguishes itself through its focus on a market-driven approach to CoinJoin, offering fine-grained control over transaction parameters, and incorporating features like fidelity bonds for protection against Sybil attacks. It provides flexibility with Segwit address support, multiple mix depths, and automated coinjoin sequences. The inclusion of PayJoin functionality further enhances privacy for various use cases.
- Segwit & PayJoin: Supports Segwit addresses and PayJoin for increased privacy.
- Automated Coinjoins: Enables automated coinjoin sequences for streamlined operation.
- Fidelity Bonds: Incorporates fidelity bonds to mitigate Sybil attack risks.
- Fine-grained Control: Offers control over transaction fees, coin amounts, and participants.
- GUI (Joinmarket-Qt): Provides a user-friendly graphical interface for Taker role.
The project has been archived and is no longer actively maintained, though releases remain available for historical use. Development activity has slowed significantly in recent years. Documentation and the core codebase are relatively complete, but community support is limited. While the base functionality is mature, the project is not recommended for new deployments.
JoinMarket benefits those seeking enhanced Bitcoin privacy and fungibility through controlled coinjoins. It addresses scenarios where users desire increased anonymity in their financial transactions. It provides a viable alternative to less sophisticated coinjoin implementations or manual mixing methods, but its archived status means it should not be used for new, critical applications.