I liked Mozilla's Persona (BrowserID) for the fact that it protected privacy from the 3rd party provider. You're asking for privacy protections from the site seeking identity authentication.
It's a fascinating idea to have some means of identity authentication where the party seeking to authenticate your identity doesn't have enough identity information to connect the dots, and the party providing authentication doesn't even know about the party seeking authentication.
It's a fascinating idea to have some means of identity authentication where the party seeking to authenticate your identity doesn't have enough identity information to connect the dots, and the party providing authentication doesn't even know about the party seeking authentication.