Fecha de publicación: 28/03/2024 Fuente: Wipo "digitalization" Disclosed in the present invention include methods and systems for issuing a certificate-type credential and electronically signing a document. Both applications require to verify if a digital credential of a prover or a signer is authenticated. Authentication of the digital credential requires a two-fold verification that the digital credential is verified to be valid and one of at least one issuer linked to the digital credential according to a parent-child relationship is verified to be trusted. To verify that the digital credential is valid, validity of a proof, expiration date, and revocation information associated with the digital credential should all be verified to be valid. The two-fold verification secures more for digital credential verification. Non-certificate type digital credentials and certificate-type digital credential can be organized in a digital identity hierarchy allowing ownership of multiple digital credentials to one entity implemented with distributed ledger technology effectively avoiding single point of failure.