Blockchain is a decentralized, open and transparent distributed database technology, which can ensure the reliability and security of data, so it is widely used in identity authentication.

The process of blockchain identity authentication is generally as follows:

User registration: users register accounts on the blockchain and submit personal information, including name and ID number.

Authentication: the nodes in the blockchain authenticate to ensure that the information submitted by users is true and effective.

Authentication: After authentication, the node will generate a unique identity identifier (ID) for the user, which is called "public key" for subsequent authentication.

Signature authentication: users use their private keys to digitally sign the information to be authenticated and upload the signature to the blockchain. Blockchain nodes use public keys to verify the validity of signatures and ensure that information is sent by users themselves.

Data storage: authentication information will be stored in the blockchain to ensure the security and reliability of data.

In short, blockchain identity authentication uses the characteristics of decentralization and distribution to ensure the safety and reliability of user identity information, while ensuring the privacy and confidentiality of identity information.