Knowledge signature-based block chain transaction identity privacy protection and traceable method and system

The invention discloses a block chain transaction identity privacy protection and traceable method and system based on knowledge signature. The method comprises the steps of system setting, identity registration, transaction construction, transaction verification and transaction tracking. According to the method, the knowledge signature is applied to the block chain system, so that strong anonymity and traceability of the user identity are realized; and the transactions can be supervised by supervising the encrypted ciphertext and the tracking tag. Besides, a secret key sharing technology is introduced on the basis of supervision, so that multi-party supervision is realized, and the problem of power abuse caused by a single supervision mechanism is avoided. According to the method, conditional identity anonymity is provided for the block chain application user, and the problem of contradiction between privacy protection and traceability of the block chain user identity is solved. 本发明公开一种基于知识签名的区块链交易身份隐私保护且可追踪