bitcoin-l2-bob
BOB (Build on Bitcoin): hybrid Bitcoin/Ethereum L2 using OP Stack + Bitcoin security. Bridges to Bitcoin via threshold signatures + zk-proofs. USE WHEN: building cross-chain Bitcoin/Ethereum apps, evaluating BOB hybrid model.
What this skill does
# BOB (Build on Bitcoin) Hybrid L2 combining Bitcoin and Ethereum. Built on **Optimism's OP Stack** but with Bitcoin-anchored security mechanisms. ## Architecture - **OP Stack** for execution (Optimistic rollup style). - **Anchored to Ethereum** for data availability + initial security. - **Bitcoin anchoring**: state hashes also committed to Bitcoin via inscriptions / Taproot commitments. - **Bridges**: native to Ethereum, with Bitcoin via federation + zk proofs. ## Hybrid security The "hybrid" model means BOB inherits both: - **Ethereum's** data availability + fraud proofs. - **Bitcoin's** PoW for state finality (via anchoring). Trade-off: complex architecture, but potentially stronger long-term guarantees. ## Use cases - **Cross-chain DeFi** spanning BTC + ETH ecosystems. - **Apps that benefit from EVM tooling + Bitcoin anchoring**. - **NFT bridges** between Ordinals / Ethereum NFTs. ## Comparison | Aspect | BOB | Citrea | RSK | |--------|-----|--------|-----| | Execution | EVM (OP Stack) | zkEVM | EVM | | Settlement | Ethereum + Bitcoin | Bitcoin only | Bitcoin merge mining | | Bridge | Multi-asset | BitVM2 | Federation | ## Limitations - **Complex security model** — harder to audit. - **Dual-chain dependence** — outages on either Ethereum or Bitcoin affect. - **Smaller community** than EVM-only L2s. ## See also - [hemi/SKILL.md](../hemi/SKILL.md) - [bsquared/SKILL.md](../bsquared/SKILL.md) - [merlin/SKILL.md](../merlin/SKILL.md) - [botanix/SKILL.md](../botanix/SKILL.md)
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