May Payjoin Update
Payjoin for Batching, Liana Timelocks, and Splicing, oh my!
Hey Joiners,
Payjoin support and adoption has been growing this spring. May opened up a number of discussions from new contributors for ideas to use payjoin to solve problems other than privacy.
Practical Payjoin Adoption
At the Miami Bitcoin Conference, “A 60yo woman bought a Passport with Payjoin in person” from Foundation Devices. Real world adoption is the whole point, so I’m celebrating this one. Cheers to the Foundation team for their leadership in this direction.
BTCPayServer fixed a payjoin bug for the next release. I’m excited to try it out. Thank you Kukks and Pavlenex. The OG payjoin software continues to evolve.
The Payjoin Dev Kit library payjoin v0.8.0 has been released. Receiver error handling has been overhauled and tested with other independent payjoin compatible software. Wallets who enjoy persistent internet connectivity should reach out to evaluate an integration. It works.
New Advanced Payjoin Uses
You may have seen some of the new ways to use payjoin to reduce fees in in the last post about batching. Friends at Bitcoin Optech picked it up in Newsletter #251. Dave Harding revived Greg Maxwell’s transaction cut-through idea to describe down this kind of cooperative batching. The payjoin protocol handles the accounting authentication that Greg left as an open question in the 2013 bitcointalk post introducing the idea. Thanks to Optech host a twitter space where I was able to add more color on the idea next to @glozow, @actuallyCarlaKC, Severin Bühler, Mike Shmidt, and Murch. Have a listen.
Dusty Daemon, the champion of lightning splicing exclaimed “Payjoins and Splicing are a match made in heaven!” Dusty is funded by OkCoin to pursue splicing. I’m looking forward to exploring this match in more depth this summer.
I was able to meet with the Liana team in Miami. Liana is a wallet that lets you recover coins after time passes if you lose the keys. Project lead Édouard Paris introduced the genius idea to leverage payjoin’s interactivity to automatically refresh that timelock upon receipt of funds. The advanced use cases just keep rolling in.
Wrapping Up
As we look forward to June, it's clear that payjoin is more than a simple protocol—it's an exciting space for experimentation, collaboration and innovation. And it's a testament to the strength of our community, which is never shy about exploring new ideas and pushing boundaries.
Whether it's practical adoption, protocol improvements, or advanced use cases, every advancement brings us one step closer to a more resilient Bitcoin network. I would like to thank all contributors and supporters who make this possible.
So here's to another month of sharing, learning, and growing. If you have thoughts or ideas, don't hesitate to share. Your participation helps drive the payjoin community forward.
And remember, every time you use payjoin, you're not just enhancing your own privacy, you're also helping to strengthen the privacy of the entire Bitcoin ecosystem. So keep joining, and let's make June the biggest month yet for payjoin.
See you next month, joiners!
Best,
Dan