Bustapay :: a practical coinjoin protocol.

Proposed Bustapay, a way for payer and receiver to sign one payment together to defeat common tracking methods.

The payer first hands over a complete, signed payment; if the joint version never arrives, the receiver can broadcast that one instead. The receiver adds their own coins, hiding who owns what and how much was really sent. BIP 78, Payjoin, is listed as its replacement.