In recent days, BOB's BitVM bridge has been tested online. Although there hasn't been much discussion in the community, I personally believe that this is a crucial step for the Bitcoin ecosystem, and may even determine whether BTC DeFi can truly land. In the broader context, BOB is a BTC+ETH hybrid chain that inherits both the security of Bitcoin and the composability of the entire infrastructure of the Ethereum ecosystem. Simply put, the core purpose of BOB is to truly involve native BTC in the on chain financial logic, without packaging assets, requiring custody, or relying on multiple signatures. Compared to the previous BTC DeFi solution, it requires some detours, such as locking BTC and issuing an anchor coin to play with. The biggest problem with this structure is trust. And BOB uses BitVM to make the entire execution process a fraud proof, as long as it is verified, there is no need to trust it. To put it more bluntly, using BTC on BOB is like using ETH on Arbitrarum - both are real assets. My main focus is on the three optimizations in architecture: one ️⃣ Divide Operators into two categories, one responsible for calculations and the other responsible for withdrawals. This division of labor mechanism is actually very similar to the PoS model, adapting to the way institutions work. two ️⃣ Introducing ETH bubbles to store data without taking up the block space of Bitcoin greatly reduces execution costs and improves anti censorship capabilities. three ️⃣ Supporting the reuse of BTC collateral means that BTC staked by one node can run multiple BitVM instances, which greatly helps with scalability. What we can do now is to understand the operational logic of BitVM, monitor the progress of the testing network, and look forward to the launch of the Q4 mainnet. If it runs smoothly, the liquidity of BTC will undergo a qualitative change.