https://en.wikipedia.org/wiki/WebID

process of standardization for identity, identification and authentication on HTTP based networks. WebID-based protocols (WebID-OIDC, WebID-TLS, WebID-TLS+Delegation) offer a new way to log into internet services. Instead of using a password, for example, the member refers to another web address which can vouch for it.

WebID-OIDC is an authentication delegation protocol used by WebID-based decentralized systems such as Solid, and other LDP-based systems. It is based on decentralized OAuth2/OpenID Connect.