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Decentralized Identifier

A Decentralized Identifier (DID) is a URL-based identifier used to uniquely identify an entity on the web. What sets DIDs apart is their decentralized nature; rather than being held by centralized authorities or third-party entities, users exercise complete control over them. These identifiers are most commonly used in Verifiable Credentials (VCs) and are associated with subjects. They play a crucial role in porting VCs between repositories without the need for reissuance.

Characteristics of DID

  • Decentralization: DIDs are not controlled by a centralized authority or organization. Users have complete ownership and control over their DIDs.

  • Uniqueness: DIDs are designed to ensure the uniqueness of identification for entities on the web, preventing conflicts or duplication.

  • Interoperability: DIDs are designed to work across different systems and platforms, promoting interoperability in the digital ecosystem.

Example of a DID

An example of a DID, as per standard specification, follows the format: did:example:123456abcdef. This format highlights the structure of a DID, with “did” indicating its nature, “example” serving as a namespace, and “123456abcdef” representing a unique identifier.

DIDs serve as a foundational element in the world of digital identity, enabling secure and user-controlled identification while facilitating the transfer of Verifiable Credentials across various repositories.