Batch more transactions into fewer blocks to save you money and preserve privacy. Any Bitcoin settlement can become Payjoin with PDK.
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payjoin-1.0 shipped this week 3 years after it was named @payjoindevkit. 29 people wrote the code that went into it from 0.24, a majority of them being volunteers.
Here's what they shipped.
Full list in the release notes: github.com/payjoin/rust-payj…
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1.0 commits to the core state machine API and the persisted session format. Sessions you store today will replay in future versions.
Clients send and receive payjoin with no server to run, survive restarts and going offline, and fall back gracefully if a counterparty leaves.
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This API was hard earned through pilot integrations with @BULLBITCOIN_ Mobile and @cakewallet . More integrations are in flight and under review. Stability lets us focus on delivering them.
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Thanks to dozens of individual contributors and to @spiral_xyz , @OpenSats, @HRF, @MaelstromFund, @btrustteam, and @cakewallet for making the work possible.
Start here:
crates.io/crates/payjoin
github.com/payjoin/rust-payj…
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Payjoin Dev Kit 1.0 is here.
The Rust implementation of BIP 77 and BIP 78 payjoin is stable on crates.io, with foreign language bindings for wallets that aren't written in Rust available in Dart, C#, JavaScript, Python & more
payjoin.org/blog/2026/08/12/…
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Satsie and Justin completed one year of service as the inaugural Board of Directors. Thank you for your service and we look forward to hearing your thoughts as the organization you helped ship matures.
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@BenAllenG and @spacebear21 are joining the Board for the next year. See payjoin.org/foundation/ for the current structure.
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Payjoin Dev Kit retweeted
`shepherd` is the bark client with experimental features on signet.
I named it shepherd (dog theme) because of its unique property to "gather" the various inputs for the payjoin boards.
It adds unique features for @payjoindevkit, @CashuBTC, @AlpenLabs, BIP448 demos, and more
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Payjoin Dev Kit retweeted
We’ve spent years trying to get Bitcoin privacy right: TumbleBit, early mixing, all of it. Why haven't these tools seen any real adoption?
Dan Gould and I debate what went wrong and how the new Payjoin protocol finally makes privacy approachable. Check out our discussion down below.
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Payjoin Dev Kit retweeted
Dan Gould: Payjoin DevKit Breaks Common Input Ownership | SLP753
@bitgould of @payjoindevkit joins me to talk about how payjoin delivers transaction batching driven by real economic activity rather than waiting for pool participants, while also cutting fees through direct net settlement between counterparties.
The conversation covers current live deployments in Bull Bitcoin and Cake Wallet, remaining fingerprints / heuristics beyond common input ownership, the multi-party roadmap, and how developers can integrate the library.
00:00 — Payjoin DevKit
01:46 — Live Payjoins in Wallets Today
04:25 — No Waiting for Batch Pools
06:14 — Payjoin Works on Mobile Phones
08:29 — Oblivious HTTP Hides Your IP
10:05 — Fingerprinting Still an Issue?
14:02 — Net Settlement Saves Big Fees
15:36 — Multi-Party Payjoin Roadmap
17:10 — Build Payjoin in a Weekend
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Thanks for spreading the support @MaelstromFund
Today we’re publishing Maelstrom's Bitcoin Grant Program Annual Report, for the period ending June 2026. The report covers the technical work of the four Maelstrom funded open source developers, working to improve Bitcoin, with respect to scalability, robustness and privacy.
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This is the first grassroots, novel Payjoin cut-through implementation using PDK that we've seen. Huge.
Bark-powered Cashu Mints
Board directly from onchain to your @CashuBTC balance using any @payjoindevkit enabled wallet such as @BULLBITCOIN_
Private. Anonymous. Proof of Reserves.
(Mainnet demo. Proof of concept only. Second is NOT operating any mints)
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Async Payjoin @BtcpayServer plugin making serious progress
Contributions to Payjoin Plugin for BTCPay Server by @V_Polyachenko
A BTCPay Server plugin that adds Async @payjoindevkit (BIP-77) support to the checkout flow. The plugin uses C# bindings to the Rust Payjoin Dev Kit generated via UniFFI.
🔗 github.com/ValeraFinebits/bt…
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Look, Payjoin Dev Kit in Javascript
Node Payjoin Demo by @xstoicunicornx
A Node @payjoindevkit demo in Typescript that replicates the functionality of payjoin-cli, the reference implementation for the payjoin protocol.
🔗 github.com/xstoicunicornx/no…
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Payjoin Dev Kit retweeted
Armin Sabouri, Pyth (@pythcoiner), Conduition (@conduition_io) , and Jonas Nick (@n1ckler) joined Optech to discuss Newsletter #399:
News
● Wallet fingerprinting risks for payjoin privacy (44:15)
● Draft BIP for a wallet backup metadata format (1:04:26)
Changing consensus
● Compact Isogeny PQC can replace HD wallets, key-tweaking, silent payments (24:23)
● Varops budget and tapscript leaf 0xc2 (aka Script Restoration) are BIPs 440 and 441 (1:13:24)
● SHRIMPS: 2.5 KB post-quantum signatures across multiple stateful devices (02:02)
Releases and release candidates
● Bitcoin Core 31.0rc2 (1:22:07)
● Core Lightning 26.04rc2 (1:23:32)
● BTCPay Server 2.3.7 (1:24:04)
Notable code and documentation changes
● Bitcoin Core #32297 (1:26:29)
● Bitcoin Core #34379 (1:28:54)
● Eclair #3269 (1:30:37)
● LDK #4486 (1:32:59)
● LDK #4428 (1:35:00)
● LND #9982 (1:37:13)
● LND #10063 (1:39:00)
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Payjoin Dev Kit retweeted
Big thanks to @btrustteam for the support to work on Payjoin
Really appreciate @payjoindevkit team for their support and guidance .
Shoutout to @btrust_builders @BitDevsKaduna @FreeRoutingAf your programs and community played a huge role in getting me here
Keep building 🚀
@M_Aliyu_Shehu works on improving privacy and reliability in Bitcoin transactions through the @payjoindevkit.
His contributions include strengthening persistence, improving maintainability, and addressing protocol-level security issues such as session replay vulnerabilities.
He has also improved time-handling accuracy to align with BIP‑77. Going forward, he will focus on expanding Payjoin adoption by integrating PDK into @bitcoindevkit CLI, implementing ASMAP-based relay and directory selection for better network privacy, and improving system reliability through enhanced fallback mechanisms and testing infrastructure.
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Payjoin Dev Kit retweeted
Wallet fingerprints are subtle and can undo the hard work you do to preserve your privacy. Broke this down in my latest post.
How can wallet fingerprints be used to damage Payjoin privacy? @Arminsdev spent a week in a darkly lit room to study this class of attacks against real-world Payjoins.
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How can wallet fingerprints be used to damage Payjoin privacy? @Arminsdev spent a week in a darkly lit room to study this class of attacks against real-world Payjoins.
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