Grain and oil food credible tracing method and equipment based on block chain

The invention discloses a grain and oil food credible tracing method and equipment based on a block chain, belongs to the technical field of block chains, and is used for solving the technical problems that an existing grain and oil food data storage method cannot ensure the authenticity and transparency of grain and oil food data and cannot trace full supply chain data of grain and oil food. The method comprises the steps of performing format verification on grain and oil food data of each supply link in a block chain node through an intelligent contract; acquiring data summary information of the grain and oil food data in each supply link; encrypting the data summary information through a digital signature technology to obtain corresponding signature data; according to the signature data, verifying the grain and oil food data of each supply link uploaded by the user, and storing the data into a cloud database after the verification is passed; determining a data index code according to the grain and oil food