“…In terms of technology, the aspects of parallelization, consensus, crosschain, and channel technologies are very important for the future. There has already been some good progress, including cryptographic security (such as zero-knowledge proofs [49] and ring signatures [50]), consensus mechanisms (such as verifiable random functions [51]), the infrastructure of blockchain (such as multichain, channel technology, and directed acyclic graphs), distributed file systems [such as InterPlanetary File System (IPFS) [52]], and identity management [such as decentralized identifiers (DIDs) [53] and self-sovereign identity (SSI) [54]], among others. For example, IPFS is a peer-to-peer distributed file system that seeks to connect all computing devices with the same system of files, which makes storing and sharing large files more efficient.…”