Manuel is a member of Argot Collective, an Ethereum Foundation spin-out working on compilers and developer tooling, where he builds source-code verification infrastructure for the Sourcify project. Most recently his focus has been Onay, a local signing companion that verifies transactions on your own device, and the Ethereum Foundation’s Clear Signing Initiative, where he co-maintains the open descriptor registry and develops an ERC-7730 decoding library. He has worked in the Ethereum ecosystem since 2018, on open-source projects such as Raiden Network and Beamer Bridge.