Async Payjoin, the HTTPS of Bitcoin Privacy

Async Payjoin is presented as a crucial step towards enhancing Bitcoin privacy, drawing parallels to HTTPS's role in securing web transactions. Developed by the Payjoin Foundation, it's designed for easy integration into existing Bitcoin wallets and the core Bitcoin implementation, utilizing familiar cryptographic primitives. Unlike privacy-focused wallets, Async Payjoin is a software library intended as an open standard for privacy, similar to HTTPS. It addresses a key limitation of the original Payjoin (V1) by enabling asynchronous transactions, meaning users don't need to be online simultaneously. A growing number of wallets already support Payjoin V1 and V2. The foundation, funded by OpenSats and Cake Wallet, emphasizes a nonprofit approach to ensure sustainable development and user control over privacy. Async Payjoin works by obscuring the typical input/output patterns of Bitcoin transactions, making on-chain analysis more difficult. The protocol utilizes blinded directory servers and Oblivious HTTP to protect user IP addresses and encrypt transaction payloads, offering a privacy-enhancing solution without compromising Bitcoin's scarcity.

(Source：Bitcoin Magazine)