Abstract: With the rapid development of network technology, the authentication of digital identity has attracted more and more attention. Most of the existing methods to ensure the security of digital identities have the problem of centralized trust. We studied the shortcomings of the traditional digital identity authentication in detail. A distributed digital identity authentication scheme based on blockchain was proposed combining with the characteristics of distributed storage and difficult tampering of Blockchain technology. We designed the overall architecture and corresponding processes and realized the application and verification of BID independent identity, thereby further improved the security of digital identity authentication.