Blockchain privacy protection scheme based on ring signature

In recent years, blockchain has received extensive attention due to its characteristics of decentralization and non-tampering. However, in the traditional blockchain transaction process, transaction information is recorded in the ledger. Because the ledger is open and transparent, attackers can obtain privacy information such as user account address and transaction amount through the ledger information. Therefore, in order to make the blockchain widely used, it is necessary to solve the security problems brought by the disclosure of its ledger. This paper mainly improves the ring signature technology to ensure the privacy and anonymity of transactions, and realizes the privacy protection of blockchain data. At the same time, an audit node is introduced to determine whether the user is the user who signed the illegal transaction according to the commitment calculated by the user, so as to realize the traceability of illegal users. The simulation results show that the scheme is feasible.