#[0] With the increasing number of clients on Nostr, the security of the private key will be a problem. Can we provide a dual authentication function for the user to choose, that is, login of the private key requires another verification code? Is this possible.

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Don’t think this is possible

When you add a second login factor then you need a mail phone number etc. to log in.

But this doesn’t protect your private key in general

Yes, we can give users a choice