Build everything on Bitcoin
BOB is a hybrid L2 that combines the security of Bitcoin with the versatility of Ethereum
Uniting the best of Bitcoin and Ethereum
EVM smart contracts
BOB allows devs familiar with EVM to start building on Bitcoin now. Be the fastest to market, powered by the best-in-class EVM tooling, wallets, analytics, and key blockchain infrastructure, as well as a tailor-made Bitcoin developer suite.
Bitcoin alignment
BOB is a collective undertaking to scaling Bitcoin the right way: inheriting security from Bitcoin PoW, contributing to Bitcoin's economy and providing usable decentralization for builders today - without waiting for hard forks.
Dual liquidity
Connected to both Bitcoin and Ethereum, BOB sources liquidity from the two largest blockchain ecosystems and positions itself to be the market's top solution for DeFi mass adoption.
Total Value Locked
$
100000000
Explore the BOB ecosystem and harvest spice
Launch and Grow on BOB
BOB has the best-in-class EVM and Bitcoin infrastructure, paired with the fastest onramps for BTC, stablecoins and ERC20s.
For EVM Projects
BOB is the easiest way to get exposure to the massive Bitcoin ecosystem: the largest web3 user base, massive BTC liquidity and novel assets including Runes, Ordinals, BRC20s, etc.
For Bitcoin Apps
BOB is the best way to get access to Ethereum's DeFi powerhouse. Onboard DeFi power users, plug into the best on/off-ramps and tap into deep liquidity in stablecoin and other bluechip assets.
The Ultimate Dev Playground
Come build on the intersection of Bitcoin and EVM using the state-of-the-art developer tooling, analytics, wallets, and blockchain infrastructure. Go from idea to mainnet faster than ever, powered by BOB’s SDK - your Swiss army knife for all things Bitcoin and EVM smart contracts.
BOB is powered by Optimism OP Stack
Start Building
BOB Mainnet
The BOB mainnet is now live. Deploy your smart contracts now and participate in the BOB Fusion ecosystem growth program.
Developer Resources
Check out our comprehensive developers docs and access resources to develop protocols on Bitcoin.
Frequently Asked Questions
Understand why we are building BOB and how it works on a high level. Then, dive into the details of the stack and the technology.
Roadmap
Building the first hybrid L2, one block at a time.
Phase 1
Bootstrapping BOB: Optimistic ETH 
Roll-up
Phase 2
ETH Rollup with Bitcoin PoW Security
Phase 3
Optimistic Bitcoin Rollup via BitVM
Phase 4
ZK-Rollups if Bitcoin ever adds the necessary opcode
Backed by
