Note this feature is optional and the auth is blinded in the same way as e-cash itself. It is a ZK proof, the mint doesn't know the authenticated user.
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Being optional is irrelevant as such mints would still be considered cashu mints.
Mint knows each authenticated user with a `linkingkey`and account model: 
GitHub
nuts/16.md at 9cb6272e9d1eb26fdfb117318bba825c068e888d · cashubtc/nuts
Cashu protocol specifications https://cashubtc.github.io/nuts/ - cashubtc/nuts