#Mono Claim Credentials

Mono claim credentials are digital credentials that only describe a single attribute about their Holder, for example, the fact that someone is older than 18 years old.

Mono claim credentials enable selective disclosure without the use of more complex technologies like SD-JWTs or zero-knowledge proofs. As a result, instead of issuing a single digital credential that includes multiple attributes ( e.g. name, date of birth, address), Issuers can issue multiple credentials, each describing different attributes (e.g. date of birth, older than 18 years, resident in Vienna or Austria, …).

#Example

Here is an example of a mono claim credential that contains a “proof of age” and is implemented as a Verifiable Credential (W3C).

{
    "@context": ["https://www.w3.org/2018/credentials/v1"],
    "type": ["VerifiableCredential", "VerifiableAttestation", "ProofOfAge"],
    "credentialSubject": {
        "id": "did:key:z6MkrHKzgsahxBLyNAbLQyB1pcWNYC9GmywiWPgkrvntAZcj",
        "over18": "true",
    },
    "issuer": {
        "id": "did:key:z6MkrHKzgsahxBLyNAbLQyB1pcWNYC9GmywiWPgkrvntAZcj",
        "name": "Government of Anytown"
    },
    "issuanceDate": "2021-08-31T00:00:00Z",
    "validFrom": "2021-09-01T00:00:00Z",
    "expirationDate": "2031-08-31T00:00:00Z"
}