Ben Allen has been named the third recipient of the Maelstrom Bitcoin Developer Grant, the family office of Arthur Hayes announced in a recent press release sent to Bitcoin Magazine. Over the next year, Allen will focus on enhancing the Payjoin Dev Kit project, a privacy-focused Bitcoin transaction tool designed to improve user anonymity and network scalability.
Payjoin, first introduced in 2019 by Nicolas Dorier in BIP 78, allows both the sender and receiver to contribute inputs to a single Bitcoin transaction. This disrupts common assumptions used by financial surveillance firms, namely the idea that multiple transaction inputs must come from a single entity. By breaking this assumption, even limited adoption of Payjoin can bolster privacy across the Bitcoin network.
“Maelstrom would like to congratulate Ben Allen on this grant,” said Arthur Hayes, Chief Investment Officer of Maelstrom. “The great thing about Payjoin, is that if only a small amount of adoption is achieved, it breaks a key assumption used by financial surveillance companies. The assumption they have is that if a Bitcoin transaction has multiple inputs, all the inputs must all belong to the same entity. Therefore, Payjoin adoption improves the privacy of even the people who don’t use it. We are excited to support Ben Allen’s work on open-source tools and software to increase Payjoin adoption.”
Allen, who will be working alongside Dan Gould, aims to expand the implementation of Payjoin so it can be integrated into more Bitcoin wallets. He acknowledged the technical complexities of the project—including the requirement for receivers to be online—but expressed optimism about overcoming these challenges.
“I’m deeply grateful to Arthur Hayes and Maelstrom for generously providing me with this grant to support my work on the Payjoin Dev Kit project,” said Allen. “With this funding, I can dedicate myself full-time to enhancing the Payjoin implementation, improving testing, and ensuring that the dev kit remains robust, well-documented, and maintainable for the future.”
Allen also emphasized the broader mission of his work: “Improving privacy for bitcoin is an area where continued improvement allows for a better experience by empowering users to control their financial data and foster greater peace of mind when using bitcoin day to day. This is an exciting opportunity to contribute to Bitcoin’s privacy and scalability, and I’m looking forward to continuing to collaborate with the community to make Payjoin more widely adopted.”
Maelstrom, which is focused on supporting digital asset infrastructure, is led by Arthur Hayes, co-founder of BitMEX. Through grants like this one, the firm is investing in the foundational tools that promote a more private, scalable, and decentralized Bitcoin ecosystem.
