OpenID is an open community specification for Internet identity and Web authentication based on URLs/XRIs    (3GKP)

It is a decentralized digital identity system, in which any user's online identity is given by URL (such as for a blog or a home page) or an XRI (eXtensible Resource Identifier), and can be verified by any server running the protocol (XRI v2.0 or later).    (3D1Y)

see:    (3D1Z)