LumiBit

LumiBit is a zero-knowledge rollup layer on Bitcoin that aims to offer a full EVM environment while keeping Bitcoin wallets and addresses. It compresses state changes with the Halo2 proof system and KZG commitments, inscribes proofs onto Bitcoin, and lets anyone running an open-source client verify the latest off-chain state independently, with data availability resting directly on the Bitcoin mainnet.

Execution follows a Type 2 zk-EVM design in which a universal circuit supports Turing-complete computation, so contracts deploy directly; sequencing nodes batch transactions and produce proofs, a validator network checks the aggregated roots and compressed state is written back to mainnet. Bridging offers two paths, a consensus bridge relying on multi-signature and consensus and a UTXO channel bridge carrying mapped assets in UTXOs. Later versions switched the proof backend to Succinct's SP1 to shorten generation time.