Antitampering Scheme of Evidence Transfer Information in Judicial System Based on Blockchain

In the process of handling criminal cases, it is crucial to avoid evidence tampering and ensure the integrity, consistency, and nonrepudiation of evidence transfer records, which is highly related to the fairness and credibility of the judiciary. To address this problem, we propose a consortium blockchain network to record evidence transfer events among different departments of China's judicial system. We design the format of a transaction and a block. In addition, the smart contracts for three types of transactions are also proposed. The Raft consensus algorithm is adopted to accomplish the consensus process. A security analysis shows that the proposed scheme can achieve the design goal (the integrity, consistency, and nonrepudiation of evidence transfer records stored in blockchain). Furthermore, a set of experiments were conducted to analyse the performance of the proposed scheme. The experiments results show that the throughput of the system is proportional to the send rate within a certain threshold. The latency decreases with increasing send rate if the send rate is within a certain threshold. Peer nodes in the system consume the most storage and communication cost. The values of block size and block generation interval time have a slight influence on the performance of the system.