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Online identity registrar. Lets you obtain a single iName (aka XRI) which also works as an OpenID, which you can then use to log in with (and/or quickly sign up for) other web sites.1id.com is the most reliable, and one of the longest running XRI registrars on the internet. It also offers CryptoPhoto multi-factor mutual authentication, so it's also the easiest and fastest to log in with, and offers the strongest security available of any online SSO provider.