On October 24, 2025, OxDavinci published a BTCBwBTC bridge, the BTCtowBTC Bridge, marking a new step in blockchain interoperability. BOB is a finality-based hybrid layer 2 network based on the Bitcoin blockchain and is an EVM-compatible optimistic rollup. This design makes it possible to adopt Bitcoin’s security guarantees and apply developer tools to create Ethereum applications such as Solidity, Truffle, and Hardhat. This integration will allow you to deploy DeFi, AI, and privacy-oriented applications without moving BTC off-chain or leveraging wrapped tokens.
For many years, the power of Bitcoin was locked within its own walls, safe and proven, but isolated. @build_on_bob changes this by combining the security of Bitcoin with the flexibility of Ethereum.
It’s not about moving BTC off-chain or wrapping it somewhere else, it’s about expanding Bitcoin… pic.twitter.com/dRx3GU0WRA
— Da Vinci (@OxDavinci) October 24, 2025
Technical background and economic effects
In contrast to the wrapping model where BTC is decrypted on the native chain. BOB extends the economic layer of Bitcoin by directly tying consensus security to EVM execution. This two-tier system also allows for the aggregation of liquidity in the Bitcoin and Ethereum systems. Now, developers can develop protocols that involve native BTC in DeFi lending. It can also be used for yield farming and staking applications. This model also strengthens the use of Bitcoin as an active capital base. We make no compromises in the areas of decentralization and verifiability.
Cross-chain innovation and developer utility
BOB interoperability also opens the following applications: Privacy dApps: BOB allows for privacy-friendly contracts that are compatible with Bitcoin’s security ethos. This gateway provides frictionless access to EVM, allowing developers using Ethereum and other layer 2s to develop on Bitcoin without changing their development stack.
Since BOB is an optimistic rollup, there is a typical 7-day withdrawal period for security against fraud. Its model is double-layered and requires continuous auditing to avoid smart contract vulnerabilities. Nevertheless, BOB’s immutable anchoring to the Bitcoin ledger creates a risk of consensus-level attacks. This makes it significantly lighter than regular cross-chain bridges. It has historically been susceptible to abuse, resulting in cumulative losses of over $2 billion as of 2020.
Positioning in the blockchain world
Interoperability will also be one of the biggest bottlenecks in blockchain by October 2025. The fact that BOB is compatible with major networks and customizes Bitcoin PoW with Ethereum. The tool therefore represents an important milestone in the crypto stack. Analysts consider this to be a bridge protocol, but in keeping with the industry trend of minimizing cross-chain liquidity through trusts rather than wrapped asset systems.
