@mattrglobal/jsonld-signatures-bbs v1.2.0
jsonld-signatures-bbs
The following repository contains the specification and a reference implementation for generating linked data signatures using the BBS+ Signature Algorithm using BLS12-381 key pairs.
Due to the properties of a BBS+ Signatures a zero knowledge proof can be derived from the signature, whereby the party generating the proof can elect to selectively disclose statements from the originally signed payload.
Getting Started
To install
yarn install --frozen-lockfile
To run the tests
yarn test
Sample Credential
The following is an example of a signed JSON-LD document featuring a BBS+ linked data signature.
{
"@context": [
"https://www.w3.org/2018/credentials/v1",
"https://w3id.org/citizenship/v1"
],
"type": ["VerifiableCredential", "PermanentResidentCard"],
"issuer": "did:example:28394728934792387",
"issuanceDate": "2019-12-03T12:19:52Z",
"expirationDate": "2029-12-03T12:19:52Z",
"credentialSubject": {
"type": ["PermanentResident", "Person"],
"givenName": "JOHN",
"familyName": "SMITH",
"gender": "Male",
"image": "data:image/png;base64,iVBORw0KGgo...kJggg==",
"residentSince": "2015-01-01",
"lprCategory": "C09",
"lprNumber": "999-999-999",
"commuterClassification": "C1",
"birthCountry": "Bahamas",
"birthDate": "1958-07-17"
},
"proof": {
"type": "BBSSignature2020",
"signature": "eyJhbGciOiJFZERTQSIsI...wRG2fNmAx60Vi4Ag",
"requiredRevealStatements": [ 1, 2, 3, 4, 10],
"proofPurpose": "assertionMethod",
"verificationMethod": "did:example:28394728934792387#keys-7f83he7s8",
"subjectVerificationMethod": "did:example13920596349402396#keys-5920692"
}
}
Whereby the subject is able to generate a zero knowledge proof, from the signed JSON-LD document of the form.
{
"@context": [
"https://www.w3.org/2018/credentials/v1",
"https://w3id.org/citizenship/v1"
],
"type": ["VerifiableCredential", "PermanentResidentCard"],
"issuer": "did:example:28394728934792387",
"issuanceDate": "2019-12-03T12:19:52Z",
"expirationDate": "2029-12-03T12:19:52Z",
"credentialSubject": {
"type": ["PermanentResident", "Person"],
"givenName": "JOHN",
"familyName": "SMITH",
"commuterClassification": "C1",
"birthCountry": "Bahamas",
"birthDate": "1958-07-17"
},
"proof": {
"type": "BBSSignatureProof2020",
"proof": "eyJhbGciOiJFZERTQSIsI...wRG2fNmAx60Vi4Ag",
"domain": "did:example:relying-party",
"subjectDomainProof": "eigqeivIenvIEiHtiW...6ChjkeIchjs"
"requiredRevealStatements": [ 1, 2, 3, 4, 10],
"revealedAttributes": [ 1, 2, 3, 4, 5 ],
"totalAttributes": 10,
"proofPurpose": "assertionMethod",
"verificationMethod": "did:example:28394728934792387#keys-7f83he7s8"
}
}
References
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