Andrew has been part of the Bitcoin community since 2011, and has contributed to the development of signature tech such as MuSig, Taproot, and Miniscript. He was also a maintainer of libsecp256k1, the high-assurance high-performance library underlying Bitcoin Core, for several years. Lately he has been focused on self-custody in the form of "codex32", a project to create and verify strong checksums on seed data without any use of electronic computers.