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CoinJoin is a special kind of bitcoin transaction which aims to improve privacy. A coinjoin transaction is one where multiple people have agreed to form a single transaction where some of the the outputs have the same value. A casual observer of the blockchain cannot tell which output belongs to whom. Unlike many other privacy solutions, coinjoin transactions do not require a modification to the bitcoin protocol.

This type of transaction was first described in a post[1] by gmaxwell.

An example 2-party coinjoin transaction. The outputs to addresses 1MUzngtNnrQRXRqqRTeDmpULW8X1aaGWeR and 1Fufjpf9RM2aQsGedhSpbSCGRHrmLMJ7yY are coinjoined.

See Also