Thanks to  nostr:npub179e9tp4yqtqx4myp35283fz64gxuzmr6n3yxnktux5pnd5t03eps0elz4s calling me out on the ease of use of npub.cash, I am working on a OTP type login. 

The user will enter their pubkey to login. The server generates an one-time-password and send it to this pubkey in an encrypted DM. The user can then enter the OTP in the browser window and obtain a session token.

This will dramatically increase the UX on mobile devices and offer a more sure way to login vs. raw nsec.

https://m.primal.net/IfRb.png