The evolution of Payjoin: from a two-party agreement to a multi-party framework

Author: Conor Okus

Source: https://payjoindevkit.org/2025/03/18/the-evolution-of-payjoin/

"Payjoin" is a revolutionary protocol that allows wallets to communicate with each other and create collaborative, smarter, and more efficient Bitcoin transactions. It provides a batching payment technique where exchanges and payment processors can save on fees, protect their and users' financial privacy, and simultaneously enhance Bitcoin's scalability.

BTCPayServer software has already supported Payjoin technology, and in 2024, the project brought significant progress alongside the implementation of "Async Payjoin" in the Bull Bitcoin mobile wallet and ongoing development work in Cake Wallet.

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By implementing such a collaborative framework, Payjoin V3 brings a long-standing idea in the Bitcoin ecosystem to to reality, with significant implications for transaction efficiency and privacy.

Implementation Roadmap

The development team of Proposed paKit proposed a four-stage approach for implementing Payjoin V3:

experimental release.

Stage Multiple Senders, Multiple Receivers Payjoin<=".dy.org/2025/04/15/the-evolution-of-payjoin/#2-%E9%98%B6%E6%AE%B5%EF%BC%9A%E9%9A%90%E7%A B7%E%A7%91%E6%80%A7%E4%BC%98%E5%8C96" title="Stage : Privacy Optimization" rel="nofollow">2>Stage: Privacy

The development will establish privacy metrics: create a formalized framework for analyzing transaction privacy, develop analysis tools to evaluate different scenarios, optimize transaction patterns for maximum privacy, and>

The the final stage is dedicated to developing formation protocol (coalition formation protocol) formation protocol) unknown Bitcoin transactions to in batch transaction. This system will include a a decentralized issuance protocol matching compatible transaction partners while maintaining privacy),), a sustainable economic incentive structure, cryptographic mechanisms with minimalized trust requirements, and scalable strategies to support large-scale transaction collaboration.

Looking Forward

Payjoin is evolving from a simple two-party protocol to a to multi framework promising to revolutBitcoinins transaction construction and processing.. processing.. This roadmap starts from an experimental 5-party transaction, moving towards a fully mature,entraldec-transaction pool (where where transactions await coalition opportunities), aaiming to create a more private, efficient, scalable Bitcoin network.

future blog posts, development team will provide Provide use cases of Payjoin in multiple scenarios, such as an e-cash mint integrated with the Lightning Network:

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• We will demonstrate additional benefits of Payjoin, including saving fees through opportunistic UTXO collection, reducing chain through transaction cut-through, and improving Lightning Network efficiency through specialized channel management. These innovations are not minor tweaks, changesations of Bitcoin usage patterns, do without requiring significant protocol changes while maintaining user privacy.:请将下面文的字为英语，如果遇守到>，保留且且不要要�>的内容，其他部分一定要全部翻译成英语。 <>这个个关于的 Payjoin V3 的技术博客，主们要�为V3 发展路线和未来展望。