The Journal of China Universities of Posts and Telecommunications ›› 2021, Vol. 28 ›› Issue (5): 1-17.doi: 10.19682/j.cnki.1005-8885.2021.0029

Special Issue: Special issue on Blockchain Technology and Applications

• Signal Processing •     Next Articles

Research on cross-chain and interoperability for blockchain system


  • Received:2021-06-21 Revised:2021-10-20 Online:2021-10-31 Published:2021-10-29
  • Contact: Ming Li


At present, there is an urgent need for blockchain interoperability technology to realize interconnection between various blockchains, data communication and value transfer between blockchains, so as to break the ‘ value silo’ phenomenon of each blockchain. Firstly, it lists what people understand about the concept of interoperability. Secondly, it gives the key technical issues of cross-chain, including cross-chain mechanism, interoperability, eventual consistency, and universality. Then, the implementation of each cross-chain key technology is analyzed, including Hash-locking, two-way peg, notary schemes, relay chain scheme, cross-chain protocol, and global identity system. Immediately after that, five typical cross-chain systems are introduced and comparative analysis is made. In addition, two examples of cross-chain programmability and their analysis are given. Finally, the current state of cross-chain technology is summarized from two aspects: key technology implementation and cross-chain application enforcement. The cross-chain technology as a whole has formed a centralized fixed mechanism, as well as a trend of modular design, and some of the solutions to mature applications were established in the relevant standards organizations, and the cross-chain technology architecture tends to be unified, which is expected to accelerate the evolution of the open cross-chain network that supports the real needs of the interconnection of all chains.

Key words:

blockchain, distributed ledger technology, cross-chain, interoperability, Hash-locking, notary, relay, multi-chain