Batch more transactions into fewer blocks to save you money and preserve privacy. Any Bitcoin settlement can become Payjoin with PDK.
Joined June 2023
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Payjoin Dev Kit retweeted
Introducing Payjoin trading : when a user of BULL wallet buys, sells or pays someone via the Bull Bitcoin exchange integration, both the wallet and exchange will now automatically collaborate to create a payjoin transaction wit by default 🕶️
bullbitcoin.com/blog/payjoin…
Payjoin Dev Kit retweeted
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…
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
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.
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
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)
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.
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.
Payjoin Dev Kit retweeted
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.
Payjoin Dev Kit retweeted
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!
Payjoin Dev Kit retweeted
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 retweeted
Why isn't Payjoin the standard?
@BullBitcoin_ can't be the only ones
Payjoin Dev Kit retweeted
Since the verdict is out... we can confirm!
Pay Join rocked at @cypher_tank
Payjoin Dev Kit retweeted
⚡ 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 👀
rumble.com/v760ypk-cypher-ta…
Payjoin Dev Kit retweeted
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.
Payjoin Dev Kit retweeted
It’s not every day that we post “good news” from the IRS.
But today, the Payjoin Foundation has been recognized as a 501c3 – which means you can now make tax deductible donations to fund Bitcoin privacy.
By @joakimbook👇
Payjoin Dev Kit retweeted
Payjoin Foundation is now a 501(c)(3)
In August, the Insider covered the news that the @payjoindevkit contributors had launched the Payjoin Foundation, a non-profit organization with the goal to support free and open-source development of the Payjoin protocol and of the broader Bitcoin privacy ecosystem.
This week, Payjoin Foundation has finally received 501(c)(3) status from the Internal Revenue Service, effective as of July 23rd, 2025.
The Payjoin Foundation aims to remove the friction for developers to contribute to the project. Its goal is to remove the need for each individual contributor to go through their own administrative process of applying for self-guided FOSS grants from disparate organizations. Instead, they can contribute to an existing team, letting them focus solely on writing code. The Foundation does not operate wallets, custody funds, or provide financial services.
Being a 501(c)(3) organization means, in simple terms, to be exempt from federal income tax and to be eligible to receive tax-deductible charitable contributions in the U.S.
The Foundation's mission is to advance practical privacy in peer-to-peer digital transactions. The new status will help fund projects like the Payjoin Dev Kit, future goals, and "development of infrastructure designed to endure."
Check out the full blog post from Payjoin Foundation 👇🏻
Payjoin Dev Kit retweeted
Payjoin Foundation Gains 501(c)(3) Status, Enabling Tax-Deductible Donations for Bitcoin Privacy Development
bitcoinmagazine.com/business… via @bitcoinmagazine @payjoindevkit
