On-chain repairing for multi-party data migration

Blockchain can be used to solve the problem of mutual trust between different institutions. However, when migrating data from a traditional system to a blockchain system, the order of data transactions is difficult to determine and the data transactions on the chain can not be modified. Therefore, it is necessary to build an on-chain repairing mechanism for multi-party data migration. In this paper, an on-chain repairing system for multi-party data migration is designed to realize the multi-party data migration, the block data repairing, and the data auditing. The multi-party data migration is utilized to determine the order of data transactions, and the order determining during data transaction is solved by setting up transaction pools and sorting transactions of the same institution or different institutions. The controlled data repairing strategy is utilized to repair the error data in the blockchain based on the chameleon-hash algorithm. The data repairing audit strategy is used to ensure the controllable data repairing. Compared with the Hyperledge Fabric, the additional cost for multi-party data migration of our method is not more than 10%.