B^2 Network is a decentralized Data Availability (DA) and storage platform that addresses data compression and verification issues using an off-chain DA network. It aims to reduce dependence on the Bitcoin main network. The B^2 Hub functions as a DA layer and off-chain verification layer, similar to Celestia, to prevent data withholding and other malicious activities. In the future, B^2 Network plans to incorporate Bitcoin Layer2 to establish a universal DA layer and data storage layer within the Bitcoin ecosystem. The B^2 Hub node validates transaction batches, while storage nodes compete for block production rights to earn incentives. The workflow of B^2 Network involves the sequencer creating new blocks, the aggregator sending them to the Prover for ZK proof generation, and the B^2 Hub node verifying and transmitting the data hash to the Bitcoin chain. As a universal DA and verification layer, B^2 Hub has the potential to enhance other Bitcoin second-layer solutions.