关键词: 可修改联盟链, 变色龙哈希, 秘密共享, 可验证数据, 奖励金机制

Abstract: Blockchain had the characteristics of decentralization, tamper resistance, and traceability. The existing alliance chain system would leave traces throughout the entire process after data is uploaded, which could not be processed when sensitive information or malicious data appears, or the blockchain forks or interrupts after processing. Therefore, a federation chain data modification method based on chameleon hashing and verifiable secret sharing was proposed to address these issues. This method first assigned the trap gate of the chameleon hash to the identity node, isolating the initiator and actual modifier; Secondly, in order to ensure the correctness of redistribution values, the data corresponding to chameleon hashes in different time periods were set as verifiable data, the verification node uploads the commitment to verifiable data, and the proposal node verifies the secret shared value through the commitment; Finally, to prevent nodes from committing wrongdoing, a data correction method based on a reward mechanism was proposed, which increased the enthusiasm of nodes to correct wrongdoing and reduces the possibility of wrongdoing. Experiments had shown that the modified alliance chain method based on chameleon hashing and verifiable secret sharing improved the efficiency of processing malicious nodes by 44.1% compared to the traditional chameleon hash method for modifying alliance chain data, the calculation formula is (98% -68%)/68%=44.1%, and shortens the time for processing malicious data by nearly 53.7%, the calculation formula is (0.27 minute-0.125 minute)/0.27 minute=53.7%.

Key words: Modifiable consortium blockchain, clamenleon hash, secret sharing, verifiable data, reward mechanism