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- You get the user ID back when checking registration (as userHandle), if you're using client-side discoverable credentials.
- You can identify with this ID the user who wants to login.
- A user handle is an opaque byte sequence with a maximum size of 64 bytes, and is not meant to be displayed to the user.
- The user handle MUST NOT contain personally identifying information about the user, such as a username or e-mail address.
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only for display, i.e., aiding the user in determining the difference between user accounts with similar display names.
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- A human-palatable name for the user account, intended only for display.
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