Nostr login replaces the idea that every app must start with an empty email-password database. A public key can identify the user, and signatures can prove control of that identity.
Why login is interesting
A new app usually has no social graph. A large login provider reduces friction but introduces dependency. Nostr offers a third path: permissionless identity with portable social context.
The core flow
A user has a key pair. The public key identifies the account. A signer or remote signer authorizes events or login proofs. Apps can use NIP-07 in browsers, NIP-46 for remote signing and NIP-98 for HTTP request authentication.
Product requirements
A good Nostr login flow should feel familiar without hiding key consequences. It needs clear consent, readable accounts, session management, revocation thinking and recovery education.
Crays login design
Crays can use Nostr identity so one user can move from Crays.net to content access, venue entry, fan status, award voting, payments and governance participation without starting over in each product.