According to the Daily Planet, Bitcoin's second-layer network BSquared Network announced the launch of B² Hub, a Bitcoin data availability layer (DA layer) that integrates a state transition proof system. B² Hub will use its self-developed ZK proof verification commitment technology to help other Bitcoin ZK-Rollups achieve verification on the Bitcoin mainnet, thereby ensuring that the security level of ZK-Rollups connected to B² Hub is consistent with that of the Bitcoin mainnet, greatly improving security.