Gean

Gean is an open-source, post-quantum consensus client for Lean Ethereum, written in Go. It replaces BLS signatures with hash-based XMSS signatures and zero-knowledge signature aggregation so Ethereum's validator set can stay secure against quantum attacks, and it implements Lean Ethereum's faster finality and simpler protocol. Gean runs on the multi-client post-quantum devnets alongside the other independent Lean Ethereum clients, strengthening client diversity as Ethereum prepares for its post-quantum transition.