On October 31, the Beijing Evening News published an article "Do you want to buy a rice in the supermarket? Do you think of the "blockchain"? 》. The article mentioned that in the current generation of data, the producers themselves upload various warehouse logistics information on the blockchain, and the information cannot be tampered with. For example, in the Wal-Mart supermarket food area, a two-dimensional code has been added to the bag of five bags of rice, and the message can be displayed by scanning with WeChat. The first is the basic product information, such as specifications, manufacturers, shelf life, etc.; then the traceability information, including the raw material receiving time, raw material product report, delivery time and other processes, as well as the origin and the entire logistics line information.