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Issuing a SD-JWT Credential

Learn about issuing SD-JWT credentials which includes hashing, creating disclosures and adding decoy hashes

SD-JWT Credential Issuance Process

Credential Creation: The issuer first creates the credential, as usual.
Conversion to SD-JWT Credential: The issuer then transforms the credential into an SD-JWT. This is done by hashing all or only a subset of claims, adding decoy hashes, and preparing disclosures. At the end, the SD-JWT credential can contain plain-text claims next to disclosable ones.
Claim Hashing: The claim is transformed into a disclosure, which is a plain-text representations of the claim, by concatenating the attribute name and value, then prefixing it with a salt. The salt prevents attackers from guessing plain-text values via dictionary attacks. This is then converted to a base64 string, which will represent the disclosure. For example, the disclosure may look like this (salt + attribute name + value): [ “dC12Y2xpYi9tYXN0ZXI”, “given_name”, “John” ]. The disclosure is then put into a hash function, and the result gets included in the SD-JWT.
Adding Decoy Hashes: At this point, decoy hashes are also added to the SD-JWT. These decoy hashes are essentially dummy values that help conceal the actual number of claims a credential holds. By using decoy hashes, the issuer can prevent potential observers from determining how many claims are contained within the credential based on the number of hashes.
SD-JWT Credential Transfer to Holder: The issuer sends the SD-JWT and all disclosures to the holder. Because the holder now has the SD-JWT credential as well as all the disclosures, he can read the entire content of the credential. This allows the holder to decide which disclosures to send alongside the SD-JWT in a transaction with a verifier.
Transfer Format: On transfer, the SD-JWT is shared with the concatenated disclosures using the ~ sign. An example of this format would be:

Issuance in Action

Using either the CLI, Kotlin or REST option, you can start issuing your SD-JWT credential.

, if you never used the SSi-Kit before. I will be using ssikit as an alias for ./ssikit.sh in this section.

DID creation

Creating a did:key for our SD-JWT credential. Please refer to for all options.

Demo Video

Issuing a SD-JWT Credential

Learn about issuing SD-JWT credentials which includes hashing, creating disclosures and adding decoy hashes

SD-JWT Credential Issuance Process

Credential Creation: The issuer first creates the credential, as usual.
Conversion to SD-JWT Credential: The issuer then transforms the credential into an SD-JWT. This is done by hashing all or only a subset of claims, adding decoy hashes, and preparing disclosures. At the end, the SD-JWT credential can contain plain-text claims next to disclosable ones.
Claim Hashing: The claim is transformed into a disclosure, which is a plain-text representations of the claim, by concatenating the attribute name and value, then prefixing it with a salt. The salt prevents attackers from guessing plain-text values via dictionary attacks. This is then converted to a base64 string, which will represent the disclosure. For example, the disclosure may look like this (salt + attribute name + value): [ “dC12Y2xpYi9tYXN0ZXI”, “given_name”, “John” ]. The disclosure is then put into a hash function, and the result gets included in the SD-JWT.
Adding Decoy Hashes: At this point, decoy hashes are also added to the SD-JWT. These decoy hashes are essentially dummy values that help conceal the actual number of claims a credential holds. By using decoy hashes, the issuer can prevent potential observers from determining how many claims are contained within the credential based on the number of hashes.
SD-JWT Credential Transfer to Holder: The issuer sends the SD-JWT and all disclosures to the holder. Because the holder now has the SD-JWT credential as well as all the disclosures, he can read the entire content of the credential. This allows the holder to decide which disclosures to send alongside the SD-JWT in a transaction with a verifier.
Transfer Format: On transfer, the SD-JWT is shared with the concatenated disclosures using the ~ sign. An example of this format would be:

Issuance in Action

Using either the CLI, Kotlin or REST option, you can start issuing your SD-JWT credential.

, if you never used the SSi-Kit before. I will be using ssikit as an alias for ./ssikit.sh in this section.

DID creation

Creating a did:key for our SD-JWT credential. Please refer to for all options.

Demo Video

-s, --subject-did: DID of the subject
-i, --issuer-did: DID of the issuer
-y, --proof-type: Either JWT, LD_PROOF or SD_JWT
-t, --template: VC template, e.g VerifiableId
--sd, --selective-disclosure: Path to selectively disclosable fields (if supported by chosen proof type), in a simplified JsonPath format, can be specified multiple times, e.g credentialSubject.dataOfBirth
--num-decoys: Number of SD-JWT decoy digests to add (fixed mode), or max num of decoy digests (random mode)
--interactive: Interactively prompt for VC data to fill in
vc.txt: Path to output the generated VC

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{
    "type":[
        "VerifiableCredential",
        "VerifiableAttestation",
        "VerifiableId"
    ],
    "@context":[
        "https://www.w3.org/2018/credentials/v1"
    ],
    "id":"urn:uuid:2d35aad0-cce2-4286-adf7-c4f9a2e57f96",
    "issuer":"did:key:z6MktopRgCooC5LbjRUs6b6Yh7R5mNFTEmyLmSYZQd5Lm14a",
    "issuanceDate":"2023-06-12T14:21:34Z",
    "issued":"2023-06-12T14:21:34Z",
    "validFrom":"2023-06-12T14:21:34Z",
    "credentialSchema":{
        "id":"https://raw.githubusercontent.com/walt-id/waltid-ssikit-vclib/master/src/test/resources/schemas/VerifiableId.json",
        "type":"FullJsonSchemaValidator2021"
    },
    "credentialSubject":{
        "id":"did:key:z6MktopRgCooC5LbjRUs6b6Yh7R5mNFTEmyLmSYZQd5Lm14a",
        "currentAddress":[
            "Vienna"
        ],
        "familyName":"Baumann",
        "firstName":"Tamino",
        "gender":"Male",
        "nameAndFamilyNameAtBirth":"Jane DOE",
        "personalIdentifier":"0904008084H",
        "placeOfBirth":"Munich",
        "dateOfBirth":"2023"
    },
    "evidence":[
        {
            "documentPresence":[
                "Physical"
            ],
            "evidenceDocument":[
                "Passport"
            ],
            "subjectPresence":"Physical",
            "type":[
                "DocumentVerification"
            ],
            "verifier":"did:ebsi:2A9BZ9SUe6BatacSpvs1V5CdjHvLpQ7bEsi2Jb6LdHKnQxaN"
        }
    ]
}

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{
    "type":[
        "VerifiableCredential",
        "VerifiableAttestation",
        "VerifiableId"
    ],
    "@context":[
        "https://www.w3.org/2018/credentials/v1"
    ],
    "id":"urn:uuid:2d35aad0-cce2-4286-adf7-c4f9a2e57f96",
    "issuer":"did:key:z6MktopRgCooC5LbjRUs6b6Yh7R5mNFTEmyLmSYZQd5Lm14a",
    "issuanceDate":"2023-06-12T14:21:34Z",
    "issued":"2023-06-12T14:21:34Z",
    "validFrom":"2023-06-12T14:21:34Z",
    "credentialSchema":{
        "id":"https://raw.githubusercontent.com/walt-id/waltid-ssikit-vclib/master/src/test/resources/schemas/VerifiableId.json",
        "type":"FullJsonSchemaValidator2021"
    },
    "credentialSubject":{
        "id":"did:key:z6MktopRgCooC5LbjRUs6b6Yh7R5mNFTEmyLmSYZQd5Lm14a",
        "currentAddress":[
            "Vienna"
        ],
        "familyName":"Baumann",
        "firstName":"Tamino",
        "gender":"Male",
        "nameAndFamilyNameAtBirth":"Jane DOE",
        "personalIdentifier":"0904008084H",
        "placeOfBirth":"Munich",
        "dateOfBirth":"2023"
    },
    "evidence":[
        {
            "documentPresence":[
                "Physical"
            ],
            "evidenceDocument":[
                "Passport"
            ],
            "subjectPresence":"Physical",
            "type":[
                "DocumentVerification"
            ],
            "verifier":"did:ebsi:2A9BZ9SUe6BatacSpvs1V5CdjHvLpQ7bEsi2Jb6LdHKnQxaN"
        }
    ]
}

Issuing a SD-JWT Credential

SD-JWT Credential Issuance Process

Issuance in Action

DID creation

Demo Video

Issuing a SD-JWT Credential

SD-JWT Credential Issuance Process

Issuance in Action

DID creation

Demo Video

Issue VC with SD-JWT format

Parsing the response

Issuing a SD-JWT Credential

hashtagSD-JWT Credential Issuance Process

hashtagIssuance in Action

hashtag DID creation

hashtagDemo Video

Issuing a SD-JWT Credential

hashtagSD-JWT Credential Issuance Process

hashtagIssuance in Action

hashtag DID creation

hashtagDemo Video

hashtag Issue VC with SD-JWT format

hashtagParsing the response

SD-JWT Credential Issuance Process

Issuance in Action

DID creation

Demo Video

SD-JWT Credential Issuance Process

Issuance in Action

DID creation

Demo Video

Issue VC with SD-JWT format

Parsing the response