BOB is a Hybrid Layer-2 that inherits its security directly from Bitcoin while enabling smart-contract functionality and cross-chain interoperability. It uses optimistic verification powered by BitVM2 so state transitions and withdrawals can be challenged on Bitcoin, and it implements trust-minimized bridges to Bitcoin and Ethereum that rely on a 1-of-n “existential honesty” model rather than trusted multisig operators.

By anchoring security to Bitcoin, BOB aims to unlock DeFi for BTC without changing Bitcoin’s base protocol: users can deposit BTC (and assets from other chains) into BOB to trade, lend, and build applications against native BTC liquidity. This approach reduces the need to wrap BTC on many separate chains, concentrates liquidity around Bitcoin, and routes fees back to support Bitcoin’s long-term security budget.

BOB’s rollout is staged: it begins as an Ethereum L2 to leverage existing tooling and network effects, adds Bitcoin “soft” finality to accelerate withdrawals, and ultimately transitions to full Bitcoin security through BitVM optimistic rollups when economically feasible. The long-term vision is for BOB to make Bitcoin the interoperable, trust-minimized hub of multi-chain DeFi, offering secure bridges to most smart-contract chains and an alternative to centralized exchanges.