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Examples

Verifiable Credentials with Linked Data Proofs:

Example Verifiable Credential

{
  "@context" : [ "https://www.w3.org/2018/credentials/v1", "https://www.w3.org/2018/credentials/examples/v1" ],
  "type" : [ "VerifiableCredential", "UniversityDegreeCredential" ],
  "id" : "http://example.edu/credentials/3732",
  "issuer" : "did:example:76e12ec712ebc6f1c221ebfeb1f",
  "issuanceDate" : "2019-06-16T18:56:59Z",
  "expirationDate" : "2019-06-17T18:56:59Z",
  "credentialSubject" : {
    "id" : "did:example:ebfeb1f712ebc6f1c276e12ec21",
    "college" : "Test University",
    "degree" : {
      "name" : "Bachelor of Science and Arts",
      "type" : "BachelorDegree"
    }
  },
  "proof" : {
    "type" : "Ed25519Signature2018",
    "created" : "2021-11-17T22:20:27Z",
    "proofPurpose" : "assertionMethod",
    "verificationMethod" : "did:example:76e12ec712ebc6f1c221ebfeb1f#keys-1",
    "jws" : "eyJiNjQiOmZhbHNlLCJjcml0IjpbImI2NCJdLCJhbGciOiJFZERTQSJ9..JNerzfrK46Mq4XxYZEnY9xOK80xsEaWCLAHuZsFie1-NTJD17wWWENn_DAlA_OwxGF5dhxUJ05P6Dm8lcmF5Cg"
  }
}

Process finished with exit code 0

Example code (signing)

Map<String, Object> claims = new LinkedHashMap<>();
Map<String, Object> degree = new LinkedHashMap<>();
degree.put("name", "Bachelor of Science and Arts");
degree.put("type", "BachelorDegree");
claims.put("college", "Test University");
claims.put("degree", degree);

CredentialSubject credentialSubject = CredentialSubject.builder()
        .id(URI.create("did:example:ebfeb1f712ebc6f1c276e12ec21"))
        .claims(claims)
        .build();

VerifiableCredential verifiableCredential = VerifiableCredential.builder()
        .context(VerifiableCredentialContexts.JSONLD_CONTEXT_W3C_2018_CREDENTIALS_EXAMPLES_V1)
        .type("UniversityDegreeCredential")
        .id(URI.create("http://example.edu/credentials/3732"))
        .issuer(URI.create("did:example:76e12ec712ebc6f1c221ebfeb1f"))
        .issuanceDate(JsonLDUtils.stringToDate("2019-06-16T18:56:59Z"))
        .expirationDate(JsonLDUtils.stringToDate("2019-06-17T18:56:59Z"))
        .credentialSubject(credentialSubject)
        .build();

byte[] testEd25519PrivateKey = Hex.decodeHex("984b589e121040156838303f107e13150be4a80fc5088ccba0b0bdc9b1d89090de8777a28f8da1a74e7a13090ed974d879bf692d001cddee16e4cc9f84b60580".toCharArray());

Ed25519Signature2018LdSigner signer = new Ed25519Signature2018LdSigner(testEd25519PrivateKey);
signer.setCreated(new Date());
signer.setProofPurpose(LDSecurityKeywords.JSONLD_TERM_ASSERTIONMETHOD);
signer.setVerificationMethod(URI.create("did:example:76e12ec712ebc6f1c221ebfeb1f#keys-1"));
LdProof ldProof = signer.sign(verifiableCredential);

System.out.println(verifiableCredential.toJson(true));

Example code (verifying)

byte[] testEd25519PublicKey = Hex.decodeHex("de8777a28f8da1a74e7a13090ed974d879bf692d001cddee16e4cc9f84b60580".toCharArray());

VerifiableCredential verifiableCredential = VerifiableCredential.fromJson(new FileReader("input.jsonld"));
Ed25519Signature2018LdVerifier verifier = new Ed25519Signature2018LdVerifier(testEd25519PublicKey);
System.out.println(verifier.verify(verifiableCredential));