A Survey of Blockchain-Based Identity Anonymity Research

With the booming development of blockchain technology, blockchain-based data transactions have been applied in many fields such as finance, health-care and logistics. It can help users to realize data transactions and management more conveniently, securely, transparently and efficiently. However, there is a certain problem of identity privacy leakage when data transactions are conducted on blockchain. Therefore, the issue of user identity privacy protection has become the core issue of data transactions on the blockchain, which is crucial to the sustainable development and wide application of the blockchain. This paper discusses the privacy protection in the process of data transactions on blockchain in terms of user identity anonymity, introduces and analyzes in detail the current research status and implementation technologies for realizing identity anonymity on blockchain, explains the threats and challenges for realizing identity anonymity, analyzes the existing problems, and gives an outlook and summary of the future research directions for realizing identity anonymity on blockchain.