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## What is BOB?
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## Why BOB?
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BOB is a new type of Bitcoin-secured blockchain: a Hybrid L2. Hybrid L2s inherit security from Bitcoin, as the most secure and decentralized network.
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-**Today**: deposit BTC into centralized exchanges or wrap to a dozen of other chains via multisig bridges.
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-**The Hybrid future**: Everyone deposits assets into a BTC-secured platform that has access to native BTC liquidity… because everyone is OK to trust Bitcoin.
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### Bitcoin Security
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Security is key to unlock Bitcoin liquidity in DeFi. The BOB Hybrid L2 in its final form will inherit Bitcoin security and support trust-minimized BTC deposits and withdrawals. While native ZK verification on Bitcoin requires a fork, BitVM allows us to create optimistic rollups and bridges with the tools we have today. Unlike multisig bridges and federated sidechains (t-of-n = honest majority), BitVM remains secure even with just a single honest node (1-of-n). For more details, see the [BitVM2 paper](https://bitvm.org/bitvm_bridge.pdf) co-authored by researchers from ZeroSync, BOB, TU Vienna and others.
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Security is essential for Bitcoin liquidity in DeFi.
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BOB Hybrid L2 will inherit Bitcoin's security using Bitcoin finality through BTC staking and a native BTC bridge powered by BitVM.
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BitVM enables much more secure BTC bridges without requiring a Bitcoin fork.
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Learn more in the [BitVM2 paper](https://bitvm.org/bitvm_bridge.pdf).
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### Ethereum Liquidity
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Network effects, liquidity, and accessibility are key to a successful DeFi ecosystem. This Ethereum's super power.To harness the best of both worlds, BOB will run a trust-minimized Ethereum bridge, providing ETH users with a seamless DeFi experience.
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This "Hybrid" bridge functions like ETH L2 optimistic bridges but is uniquely powered by Bitcoin finality. An ETH L2 bridge waits for L2 finality on Ethereum. The Hybrid bridge instead checks for Bitcoin finality. In simple terms: ETH and ERC-20s deposited to BOB are secured by Bitcoin.
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BOB leverages Ethereum's network effects and liquidity while providing a trust-minimized bridge for ETH users.
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Our unique "Hybrid" bridge uses Bitcoin finality instead of Ethereum L2 finality, ensuring all assets on BOB are secured by Bitcoin's robust security model.
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Learn more in the [BOB: The Hybrid L2 whitepaper](https://docs.gobob.xyz/whitepaper.pdf).
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