I'm not saying you need Nostr or relays to communicate the data but you can use the same private & public key logic for sign up & login.

It can all still been hosted privately on someone's server. What they aren't hosting is your phone number or email address.

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Ah I see. Interesting application of nostr.

I wonder if we'll see more private uses of the tech at some point.

I'll mention nostr to his tech guy if I get in touch with him