Pharmaceutical anti-counterfeiting traceability system based on block chain double chain

In order to solve the problems of centralization, tampering, incomplete storage and privacy of patient information, a medical anti-counterfeiting traceability system based on block chain “double chain” is proposed. The system solves the problem of poor expansibility and low throughput in single chain applications, stores traceability information and consumer information separately, and realizes access control in untrusted environment by using the decentralization characteristic of block chain and the on-chain code of intelligent contract, which effectively protects consumer privacy data. The system is developed on the Fabric block chain platform of super account book (Hyperledger). The system environment is equipped with four organizations: pharmaceutical manufacturer, dealer, hospital and consumer. The chain code is developed by Java language, the client program is written by using Node.js, and the query request is initiated with the drug traceability function in the chain code. Ultimately, the certificate-certified user account can achieve drug information in the web page query. The data of block chain is difficult to tamper with, time stamp and transaction traceability can be well applied to the pharmaceutical anti-counterfeiting traceability system, which makes the traceability function of the system more perfect, and consumers can get all traceability information including drug production information, logistics information and use information.