Wanchain addresses issues associated with transferring digital assets between blockchains. The asset transfer is achieved through a decentralized cross-chain mechanism and a universal cross-chain protocol. Based on the distributed blockchain concept without using a trusted third-party, Wanchain was designed using cutting-edge cryptographic theories that underlie its technology. In cross-chain trading, Wanchain's account locking mechanism and threshold key sharing technology support complete decentralization. This decentralization offers asset account management capability while eliminating the need for the involvement of a third party.