The sign-in form on this site asks for a website rather than an email address. That URL is the identity; IndieAuth handles the proof that the person signing in controls it.
What the site receives
After a successful exchange, jdnlsn.com stores the verified profile URL in a signed, secure session cookie. It does not receive a password and does not create a conventional local account.
Why include it now
Web Sign-In makes room for future features—private posts, reactions, or attributed replies—without making the public reading experience depend on authentication.