CoinJoin in Wasabi Wallet is a privacy-enhancing transaction method designed to improve anonymity for Bitcoin users. CoinJoin works by combining multiple users’ Bitcoin transactions into a single large transaction. Instead of sending coins individually, several participants collaborate to create one transaction with many inputs and outputs. This process makes it much harder for blockchain analysts to determine which sender paid which recipient.

In Wasabi Wallet, CoinJoin is coordinated in a structured and automated way. Users who choose to participate enter a mixing round where their coins are merged with those of others of similar amounts. After the process is complete, each participant receives their Bitcoin back in standardised denominations. Because many inputs and outputs look identical, tracking the origin of specific coins becomes significantly more difficult.

Wasabi enhances privacy further by routing connections through Tor, hiding users’ IP addresses during the CoinJoin process. Importantly, users always maintain control of their private keys, meaning the wallet remains non-custodial. The coordinator who organises CoinJoin rounds cannot access or steal funds.

The main goal of CoinJoin is to improve Bitcoin fungibility, ensuring that one coin is not easily distinguishable from another. While CoinJoin increases privacy, it does not make transactions completely anonymous. Users must still follow good security practices to maximise their privacy benefits.