Decentralized identifiers (DIDs) are a type of globally unique identifier that enables an entity to be identified in a manner that is verifiable, persistent (as long as the DID controller desires), and does not require the use of a centralized registry - wikipedia 
Decentralized identifier. Verifiable digital identity technology
DIDs enable a new model of decentralized digital identity that is often referred to as self-sovereign identity or decentralized identity. They are an important component of decentralized web applications.
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# See also - DID documents - DID methods - Usage of DIDs - Standardization efforts - Self-sovereign identity