About

I work on Bitcoin at Chaincode Labs. My work has recently been focused around enhancing the robustness of the protocol and the security of its implementations. I previously co-founded Wizardsardine, of which I am still a shareholder. There i researched Bitcoin vaults and implemented Revault, a Bitcoin vault for multi-party custody. I also maintained Liana, a Bitcoin wallet aimed at reducing risks of loss. Before that i co-founded Bitcoin-Lyon, a local Bitcoin broker in Lyon, France. I also used to contribute to Lightning.

I’m interested in information security, economics and politics.

Publications

• Great consensus cleanup revival - revisiting the Consensus Cleanup 2019 soft fork proposal 5 years later.
• CVE-2024-38365 - chain split vulnerability in btcd which can be exploited at virtually no cost.
• Ledger Security Bulletin 019 - some spending conditions of a Bitcoin Script were not correctly implemented by the Ledger firmware and could have led to a loss of funds.
• CVE-2022-32984 - under some configuration the credentials to the Lightning node of a BTCPay Server point of sale were leaked, exposing all its funds to an attacker.
• Swambo, J., Poinsot, A. (2021). Risk Framework for Bitcoin Custody Operation with the Revault Protocol. - In: Bernhard, M., et al. Financial Cryptography and Data Security. FC 2021 International Workshops.