BL2 is built on the VM universal protocol and BTC security layer, BL2 aims to establish a dynamic BTC Layer 2 ecosystem by creating a dApp and smart contract platform. VM, Layer2 BL2's core is a Layer 2 platform based on the VM universal protocol. It establishes independent verification and consensus frameworks for Bitcoin block header information by transmitting Layer 2 block header summary information back to the BTC Layer 1 network for validation.