Payjoin Dev Kit

Batch more transactions into fewer blocks to save you money and preserve privacy. Any Bitcoin settlement can become Payjoin with PDK.

[Payjoin Dev Kit @payjoindevkit]

Async Payjoin @BtcpayServer plugin making serious progress

[Bitcoin Dev Project @Bitcoin_Devs]

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.

🔗 https://t.co/IDU9cGg09j

[Payjoin Dev Kit @payjoindevkit]

Look, Payjoin Dev Kit in Javascript

[Bitcoin Dev Project @Bitcoin_Devs]

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.

🔗 https://t.co/rJhH64MlU7

[Bitcoin Optech @bitcoinoptech]

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)

[Payjoin Dev Kit @payjoindevkit]

@PavelTheCoder @Arminsdev https://t.co/ptqPNABuo7

[Armin @Arminsdev]

@Multicripto @payjoindevkit I'm not sure. I pulled it from https://t.co/xtU8riZed9\

[Payjoin Dev Kit @payjoindevkit]

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.

[SHEHU @M_Aliyu_Shehu]

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 🚀

[Armin @Arminsdev]

Wallet fingerprints are subtle and can undo the hard work you do to preserve your privacy. Broke this down in my latest post.

[Payjoin Dev Kit @payjoindevkit]

https://t.co/8xmvAudbYl

[Marty Bent @MartyBent]

This would be a massive boon for on-chain privacy. Making every lightning channel re-balance transaction a PayJoin transaction would begin to erode the efficacy of common input ownership heuristics used by chain surveillance companies.

[Dusty Daemon @dusty_daemon]

Excited that PayJoin is working towards integrating into lightning opens & splices. Would be awesome if we got that!

Wanted to clear up my earlier tweet about this (attached). It is something they're going to do. Lots of complex issues to solve to get there but lets go!

[Dusty Daemon @dusty_daemon]

Okay I spoke with Dan and this is something they're working towards. It appears they've written PayJoin into LDK for the onchain wallet, with the intention of eventually getting it integrated into channel opens & splices. That would be super exciting if they can get there 🚀

[Payjoin Dev Kit @payjoindevkit]

Run your own:
https://t.co/KQZxRa4Tx6
https://t.co/6YFDAZDIEL

[Payjoin Dev Kit @payjoindevkit]

👀

[lui§chwab @luisschwab_]

Running payjoin-mailroom

[Payjoin Dev Kit @payjoindevkit]

@evankaloudis @BenJustman @BullBitcoin_ @ZeusLN 👀

[Ben Justman🍷 @BenJustman]

Why isn't Payjoin the standard?

@BullBitcoin_ can't be the only ones

[Cyphertank @cypher_tank]

Since the verdict is out... we can confirm!
Pay Join rocked at @cypher_tank

[Payjoin Dev Kit @payjoindevkit]

@cypher_tank @Hendrik21M 🙇🏻‍♂️

[Cyphertank @cypher_tank]

⚡ Episode 4 is OUT ⚡

The NON-PROFIT category of @cypher_tank

Only 1 project takes $100K 🥇
But everyone wins & THE WINNERS ARE REVEALED at the end

👉 Watch Episode 4 now 👀

https://t.co/4BmtLp6qKg

[Armin @Arminsdev]

Payjoin Dev Kit continues to ship.

This week we released our C# bindings!

[Blockspace @blockspace]

Payjoin Foundation receives 501(c)(3) status to fund bitcoin privacy

The @payjoindevkit announced its designation as a 501(c)(3) non-profit status from the Internal Revenue Service, effective July 23, 2025. The designation allows the organization to accept tax-deductible charitable contributions to fund open-source privacy protocols.

The foundation maintains a dedicated budget to recruit talent directly for deep technical work. This strategy bypasses the delays of external grant processes the organization termed “Bitcoin Grant Purgatory.”

"Having an organized foundation with a dedicated budget enables us to recruit talent to solve specific problems rather than recommend an external org make a grant to each individual contributor," Payjoin lead maintainer @bitgould said in the foundation blog post.