a question about the credential management API

[shaomaicheng]

There is a question about the credential management API, and the document will explain that the public key information returned by registration/login should be saved on the server. So, what exactly is the public key information stored on the server used for? I don't think there is any operation to save the public key to the server in the demo. It only relies on simulating the request JSON returned by the server to use the credential management API for login?