Hi Insiders. This is Tuma, open-source reporter from the Insider Edition.
This week update features a PR in ldk-node to add support for receiving Payjoin payments, a feature that would provide some interesting benefits to node operators.
We also cover the latest updates from the BIP repository, with BIP323 being published, and three new BIPs being assigned a number, specifically BIP138, BIP139, and BIP450. These three BIPs aims to improve in different ways how to backup wallets and their connected data.
Finally, we discuss some interesting news from the Bitcoin world, such as a new tool by Spiral to find vulnerabilities in open-source Bitcoin softwarre, and the latest mining company integrating support for StratumV2.
Highlights from the bitcoin developer ecosystem
I spent 10+ hours in open-source developer calls in the Bitcoin ecosystem last week. Here is what caught my eye:
PR746 in ldk-node is adding support for receiving Payjoin payments.
During the biweekly call, on Monday 11th, LDK contributors discussed PR746 by developer Rita Anene, which aims to add support for receiving Payjoin payments in ldk-node.
The PR implements the receiver side of the Payjoin protocol, including session persistence, PSBT handling, input contribution, mempool monitoring for Payjoin transactions, and node restart recovery.
What is cool about the tech: Integrating Payjoin inside ldk-node could allow operators to use only one transaction, instead of two, to open channels when depositing from an external wallet. Operators would pay less fees, gain faster establishment of Lightning channels, and improve privacy.
A BIPs Update
In the last days there was some movement in the BIP repository. Specifically, one new BIP has been published and three new BIPs have been assigned a number by BIP maintainer Murchandamus.
Published BIPs
A list of recently published BIPs
BIP323: 24 nVersion bits for general purpose use
Authors: Matt Corallo
Published On: May 13th, 2026BIP39
Layer: Applications
BIP323 is a proposal that aims to increase the number of bits reserved for nonce space in the nVersion field of the block header from 16 to 24. This avoids the nTime field to be used as extra nonce space by header-only miners.
Numbered BIPs
A list of BIPs that recently got assigned a number
BIP450: Formosa—Seed encoding by themed mnemonic stories
Authors: Yuri S. Villas Boas, André Fidencio Gonçalves
Assigned On: May 12th, 2026
Layer: Applications
PR2108 introduces BIP450, which describes Formosa, an expansion of BIP39. This proposal introduces the possibility to encode a seed using short themed sentences (e.g., subject, verb, adjective, object, place), which carry grammatical structure and semantic coherence with the aim to improve memorability for the human mind. This BIP is fully back-compatible with BIP39.
BIP139: Wallet metadata backup format
Authors: Pyth
Assigned On: May 11th, 2026
Layer: Applications
PR2130 introduces BIP139, which specifies a standard way to store various type of metadata, such as account descriptors, keys, labels, PSBTs, and more, allowing compatibility between different wallet implementations and a simpler wallet migration and recovery processes.
BIP138: Compact encryption scheme for non-seed wallet data
Authors: Pyth
Assigned On: May 11th, 2026
Layer: Applications
PR1951 introduces BIP138, which specifies a compact encryption scheme for output descriptors, wallet policies, labels, and wallet backup metadata to allow users to store sensible information on untrusted media. The encryption key derives from the public keys in the descriptor, allowing any keyholder to decrypt without additional secrets.
Other News from the Bitcoin World
Finding vulnerabilities in Bitcoin: Spiral presented their new project, Loupe, an AI-enabled vulnerabilities scanner for open-source Bitcoin projects. The aim of Loupe is to help project maintainers identifying issues in their codebases before attackers do, improving the security standards of Bitcoin-related open-source projects. Many important projects have already committed to being part of Spiral’s initial tests, including Bitcoin Core, BDK, LDK, rust-bitcoin, Cashu, Blockstre am Jade, bitcoinj, and SRI. Check the full article here.
NerdQ supports for SV2: StratumV2 announced that the NerdQ firmware had added support for the new mining protocol. NerdQ nis the third company landing support at the firmware level for StratumV2.
Looking for an opportunity to join up with some bitcoin devs in person? Join us in Vienna this May 27- 28 to talk about Austrian Economics!