Decentralized Identifiers (DIDs)


A DID is «a new type of identifier» that enables verifiable and decentralized digital identity. A DID identify any subject (e.g., a person, organization, thing, data model, abstract entity, etc.) that the controller of the DID decides it identifies. A DID is a URI that associates a DID subject with a DID document allowing trustable interactions associated with that subject, as it contains information about the authentication methods to prove ownership of that DID, endpoints, and other attributes.

Universal Resolver

Each DID is associated with a document in JSON format that contains all the public keys, verification methods and services. The way to retrieve each DID Document depends on the method itself, however, following the efforts to achieve greater interoperability, LACChain has developed a service that aims to resolve any document (although at the moment it only supports more than 7 methods); The service is available at the following URL:, and it is also possible to deploy the same tool within any infrastructure through the Universal Resolver Repository.

Method did:lac

LACChain has developed and maintains the LACChain DID method, which is a fully on-chain DID method based on the ERC-1056 standard. The “lac” DID method allows to maintain a fully on-chain management of DIDs, using smart contracts to store the DIDs and the information associated to them.

There is also implementation of LACChain DID Method in NodeJS. It provides the necessary methods and functions to interact with a DID and resolve a DID Document without the need to directly call the smart contracts.

LACChain ID Registry

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