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Payjoin transactions require both sender and receiver to contribute inputs, breaking the common input ownership heuristic. Achieving ten percent adoption of Payjoin would effectively break standard chain analysis heuristics for the entire Bitcoin network.
Development plans for Wasabi Wallet include direct hardware wallet coin joins, PayJoin V2, and silent payments. To maintain a strong security posture, the developers write and review all Nostr libraries internally without relying on external NPM packages.
Seth warns that privacy for non-Coldcard users could be damaged if they participated in coinjoins or payjoins with vulnerable Coldcard users, as transaction histories are now traceable.
Keon notes Crew proposed a privacy system called "The Black Hole," which aims to combine four coinjoin protocols - WabiSabi, ZeroLink, PayJoin, and JoinMarket - into a coherent system. The goal is to enhance participant privacy and create common denomination outputs, funded by high time-preference whales.
Matt Odell advocates for major brokers and exchanges to adopt Payjoin devkit in 2026, foreseeing substantial fee reductions for both users and services, alongside a crucial normalization of the transaction type.