Research and Implementation of Multichain Digital Wallet Based on Hash TimeLock. In terms of interoperability between different blockchains issue and achieving value exchange between different blockchains, a convertible multichain digital wallet solution is proposed. The wallet realizes the exchange of different digital currency assets by hash timelock technology. In traditional blockchain projects, each blockchain is a closed island. Users need to exchange different digital currencies through centralized Exchanges, this is contrary to the idea of decentralization and nontamperability of blockchains, safety and reliability depend entirely on Exchanges. By introducing hash timelock technology, multichain digital wallet can realize the exchange of digital assets in different blockchains without thirdparty intermediary, ensure its decentralization characteristics, safety and reliability.

A DualChain Digital Copyright Registration and Transaction System Based on Blockchain Technology. The increasing demand for digital copyright transactions in the big data era causes the emergence of piracy and infringement incidents. The traditional centralized digital copyright protection system based on centralized authority management of authoritative organizations has high registration cost. Blockchain, as a decentralized protocol, has the characteristics of decentralization, anonymity, auditability, security and persistency, which provide a solution to the current problems in the field of digital copyright. Combining with blockchain technology, this paper proposes a digital copyright registration and transaction system with double chain architecture. The blockchain based on digital copyright registration and management chain (RMC) and digital copyright transaction and subscription chain (TSC) can prevent information disclosure and improve the privacy protection by segregating account information and transaction information. Meanwhile, transforming the previous onechain architecture into multiple chains in parallel on the RMC and TSC can reduce the redundant amount of computation, the consensus efficiency and improve the throughput rate. Experimental analysis shows that the system has the advantages of short registration time, high throughput and good scalability.