The Bitcoin Bridge connects Layer 1 (L1) Bitcoin and Layer 2 (L2) smart contracts, enabling the transfer of native BTC or Bitcoin-issued assets to L2 for smart contract interactions. It's a bi-directional bridge that supports asset transfers between Bitcoin and its L2s, utilizing multisignatures for security and integrating with Bitcoin Oracle for consensus, relying on multisig-owned smart contracts and a network of validators for asset transfer verification.