Citrea The first zero-knowledge rollup on Bitcoin. Mainnet activated 27 January 2026 . zkEVM execution + BitVM2-based bridge. Repo: . Architecture - Off-chain execution : Citrea sequencer runs an EVM (Solidity- compatible) and processes transactions off-chain. - State commitments : validity proofs (ZK-SNARKs) posted to Bitcoin. - Data availability : tx data also committed to Bitcoin (full rollup, not validium). - Bridge : BitVM2-based, trust-minimized (does not require federation trust for peg-in/out). ZK proof system zkEVM type-2 (compatible with Ethereum bytecode at gas cost of running on C…