Certainly _buying_ domain names to be your identity is new, but OpenID[1] was doing basically that 15 years ago.
Add a few meta tags to your website homepage, use that homepage as your "identity" to log in to websites, and they'd up your configured identity provider to do the login & request name/email/whatever else. You weren't locked in to a particular provider, since you logged in as _your_ webpage and could change the meta tags to point to a different provider.
Add a few meta tags to your website homepage, use that homepage as your "identity" to log in to websites, and they'd up your configured identity provider to do the login & request name/email/whatever else. You weren't locked in to a particular provider, since you logged in as _your_ webpage and could change the meta tags to point to a different provider.
1: https://openid.net/