Brink is proud to announce Martin Zumsande, a long-time Bitcoin Core contributor and an expert on Bitcoin’s peer-to-peer network, will be joining us. Martin received one of Brink’s early grants in 2021 and rejoins us after several years at Chaincode Labs. He has authored over 125 merged pull requests and reviewed 500 others, with notable work on address relay, initial block download, handling of invalid blocks, and index consistency.
Martin plans to pursue several projects: researching how effectively addresses propagate across the network through simulation and real-world measurement, reducing unnecessary delays and disconnections during block download, closing a long-standing privacy leak in wallet transaction rebroadcast, and expanding the scenarios covered by validation fuzz testing. Alongside these projects, he will continue to dedicate a substantial share of his time to code review.
About Martin
Martin writes of his experience and goals:
I am very happy to have received a grant from Brink that allows me to continue my work on Bitcoin Core. I started contributing to Bitcoin Core in 2019, initially in my free time, and later worked for 3.5 years at Chaincode Labs.
Originally trained as a physicist in the field of complex systems, I am drawn most to Bitcoin’s peer-to-peer network. I find it fascinating how local rules that individual nodes follow give rise to a robust network with emergent phenomena when thousands of honest nodes (and some adversaries) interact.
With p2p being my main area of interest, I have also made contributions to many other areas of Bitcoin Core, such as validation, indexes and tests.
I want to dedicate a good part of my work to review, especially of larger, more complex proposals. As AI tools take over much of the mechanical work, I think the scarce and human-critical skill is understanding how proposed changes fit into the whole system and weighing their tradeoffs.
My initial focus for the next months will be on improving address relay - after that I plan to work on block download and block validation.
About Brink
Brink is a Bitcoin research and development centre, founded in 2020 to support independent open source protocol developers and mentor new contributors. If you or your organization is interested in supporting open source Bitcoin development, feel free to email us, donate@brink.dev.
Developers interested in the grant program can apply now.
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