Data management method, apparatus and system based on blockchain

A blockchain-based data management method, which is applied to a usage node, the method comprising:

• acquiring M pieces of digest data from N pieces of digest data included in transaction data corresponding to a specific device and/or a time period, wherein the N pieces of digest data are respectively generated on the basis of N pieces of data associated with the transaction data, and N is an integer greater than 1, and M is an integer less than or equal to N and greater than or equal to 1;
• acquiring M pieces of storage data respectively corresponding to the M pieces of digest data;
• calculating respective digests of the M pieces of storage data, and
• determining complete data associated with the transaction data is not tampered with when the M pieces of digest data are identical to the respective digests of the M pieces of storage data, respectively.

A blockchain-based data management method which is applied to an intermediate device, the method comprising:

• acquiring complete data of at least one sensor device;
• dividing the complete data of the at least one sensor device into P pieces of data, and generating complete digest data on the basis of the complete data of the at least one sensor device and/or generating P pieces of digest data on the basis of the P pieces of data respectively, and P is an integer greater than 1;
• storing the P pieces of data and/or the complete data in a data server node;
• and
• including P pieces of digest data and/or N pieces of digest data of the complete digest data in transaction data and sending the transaction data to a verification node of the blockchain, and N is equal to P or P+1,
• wherein the verification node in the blockchain generates a block of the transaction data and writes the block into the blockchain when M pieces of digest data in the N pieces of digest data calculated by the intermediate device are identical to respective digests of M pieces of storage data corresponding to the M pieces of digest data calculated by the verification node, wherein M is an integer less than N and greater than or equal to 1.