Blockchain is a term in the field of information technology. In essence, it is a shared database. The data or information stored in it has the characteristics of "unforgeable", "full trace", "traceable", "open and transparent", and "collective maintenance". Based on these characteristics, blockchain technology has laid a solid foundation of "trust", created a reliable "cooperation" mechanism, and has broad application prospects.

      What is blockchain? From a technological perspective, blockchain involves many scientific and technological issues such as mathematics, cryptography, the Internet, and computer programming. From an application perspective, in simple terms, the blockchain is a distributed shared ledger and database, which has the characteristics of decentralization, non-tampering, traces throughout the process, traceability, collective maintenance, and openness and transparency. These characteristics ensure the "honesty" and "transparency" of the blockchain and lay the foundation for the creation of trust in the blockchain. The rich application scenarios of the blockchain are basically based on the ability of the blockchain to solve the problem of information asymmetry and realize the cooperative trust and concerted action between multiple subjects.