A system comprising: a data storage layer comprising linked data blocks containing data elements; a data repository separate from the data storage layer; system circuitry in communication with the data storage layer and the data repository, the system circuitry configured to: capture biographic (802, 1102) and/or biometric (804, 1104) information of a user; store (806, 1106) the captured biographic and/or biometric information of the user in the data repository; obtain (815, 1116) a public key for the user; create (818, 1112) a digital unique identification sequence for the user; generate (820, 1118) a token for the user based on the digital unique identification sequence; generate an identity index for the user based on the digital unique identification sequence and comprising the public key for the user and the token for the user; digitally sign the identity index using a private key of the system and insert (824, 1122) the signed identity index into the linked data blocks of the data storage layer; obtain (822, 1120) a data element identifier for the inserted identity index in the linked data blocks of the data storage layer; generate (832, 1128) a digital identity attestation of the identity index for the user; digitally sign (834, 1130) the digital identity attestation using the private key of the system; generate a mapping (828, 1126) between the digital unique identification sequence, the token for the user, the data element identifier for the inserted identity index for the user, and the biographic and/or biometric information of the user stored in the data repository; and store the mapping in the data repository. a data storage layer comprising linked data blocks containing data elements; a data repository separate from the data storage layer; system circuitry in communication with the data storage layer and the data repository, the system circuitry configured to: capture biographic (802, 1102) and/or biometric (804, 1104) information of a user; store (806, 1106) the captured biographic and/or biometric information of the user in the data repository; obtain (815, 1116) a public key for the user; create (818, 1112) a digital unique identification sequence for the user; generate (820, 1118) a token for the user based on the digital unique identification sequence; generate an identity index for the user based on the digital unique identification sequence and comprising the public key for the user and the token for the user; digitally sign the identity index using a private key of the system and insert (824, 1122) the signed identity index into the linked data blocks of the data storage layer; obtain (822, 1120) a data element identifier for the inserted identity index in the linked data blocks of the data storage layer; generate (832, 1128) a digital identity attestation of the identity index for the user; digitally sign (834, 1130) the digital identity attestation using the private key of the system; generate a mapping (828, 1126) between the digital unique identification sequence, the token for the user, the data element identifier for the inserted identity index for the user, and the biographic and/or biometric information of the user stored in the data repository; and store the mapping in the data repository. capture biographic (802, 1102) and/or biometric (804, 1104) information of a user; store (806, 1106) the captured biographic and/or biometric information of the user in the data repository; obtain (815, 1116) a public key for the user; create (818, 1112) a digital unique identification sequence for the user; generate (820, 1118) a token for the user based on the digital unique identification sequence; generate an identity index for the user based on the digital unique identification sequence and comprising the public key for the user and the token for the user; digitally sign the identity index using a private key of the system and insert (824, 1122) the signed identity index into the linked data blocks of the data storage layer; obtain (822, 1120) a data element identifier for the inserted identity index in the linked data blocks of the data storage layer; generate (832, 1128) a digital identity attestation of the identity index for the user; digitally sign (834, 1130) the digital identity attestation using the private key of the system; generate a mapping (828, 1126) between the digital unique identification sequence, the token for the user, the data element identifier for the inserted identity index for the user, and the biographic and/or biometric information of the user stored in the data repository; and store the mapping in the data repository.