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Hypersign Verifiable Credential SDK

The Hypersign Verifiable Credential comply W3C Verifiable Credentials Data Model v1.1 specification whose status can be stored in Hypersign Credential Revocation Registry on Hypersign Identity Blockchain Network.
Read Hypersign Verifiable Credential (VC)for more details. 
HypersignVerifiableCredentail SDK
Is a javascript library for verifiable credentials operation (generate, issue etc). It also provides APIs to store/update/retrieve credential status to/from the Hypersign Credential Revocation Registry on the Hypersign Blockchain network easily.
NOTES
1.Let us assume that we have created a DID - acting as an issuer and subject both (for demonstration purpose) - and have also registered a schema on the Hypersign blockchain. See documentation for HypersignDID and HypersignSchema before proceeding.
​Sample Schema has only one property called name.
​Sample issuer/subject DID​
2.The subject DID may or may not be a private DID. Read concept of private and public DIDs here.
Table of Contents
​Install The Package​
​Import The Package​
​APIs​
​Initialize Instance of HypersignVerifiableCredential with offlineSigner​
​generate()​
​issue()​
​resolveCredentialStatus()​
​updateCredentialStatus()​
​Security Concerns​
Install The Package
npm i https://github.com/hypersign-protocol/hid-ssi-js-sdk  --save
Import The Package
import { HypersignVerifiableCredential } from 'hs-ssi-sdk';
APIs
Initialize instance of HypersignVerifiableCredential with offlineSigner
Create Instance of the class
const hypersignVC = new HypersignVerifiableCredential({
    offlineSigner,                    // OPTIONAL signer of type OfflineSigner
    nodeRestEndpoint: 'https://api.jagrat.hypersign.id', // OPTIONAL RPC endpoint of the Hypersign blockchain, Default 'TEST'
    nodeRpcEndpoint: 'https://rpc.jagrat.hypersign.id',   // OPTIONAL REST endpoint of the Hypersign blockchain
    namespace: 'testnet',   // OPTIONAL namespace of did, Default ''
  });
​
// OR Just initalize with offlineSigner
const hypersignVC = new HypersignVerifiableCredential({
    offlineSigner
})
OfflineSigner
You may follow this this code snippet for creating OfflineSigner
offlineSigner = await createWallet(mnemonic);
Call init() to initialize the offlineSigner
await hypersignVC.init();
generate()
Generates a new credential document of type IVerifiableCredential
API Definition
generate(params: {
    schemaId: string;
    subjectDid?: string;
    subjectDidDocSigned?: JSON;
    schemaContext?: Array<string>;
    type?: Array<string>;
    issuerDid: string;
    expirationDate: string;
    fields: object;
  }): Promise<IVerifiableCredential> 
Usage
const credentialBody = {
  schemaId: 'sch:hid:testnet:zBYQgcT4gUaFZ9CDb8W3hitfZTpZ1XkXuUyyFwAJne5HQ:1.0',
  subjectDid: 'did:hid:testnet:zHsDWbJFbg96KvTsiyPkQGAx2ANs6bFn1SPnwCmHTxrAi',
  issuerDid: 'did:hid:testnet:zHsDWbJFbg96KvTsiyPkQGAx2ANs6bFn1SPnwCmHTxrAi',
  fields: { name: 'varsha' },
  expirationDate: '2027-12-10T18:30:00.000Z'
}
const credential = await hypersignVC.generate(credentialBody)
Output
{
  "@context": [
    "https://www.w3.org/2018/credentials/v1",
    {
      "hs": "https://api.jagrat.hypersign.id/hypersign-protocol/hidnode/ssi/schema/sch:hid:testnet:zDKTDL2V3BYdmxzXZuE6oQhbGQG9Gp9QVFKtTWoSHhjt6:1.0:"
    },
    {
      "name": "hs:name"
    }
  ],
  "id": "vc:hid:testnet:zCgvWJQqiwbB3MPhhtaWpoyroYVgyVwSKaLPyYXXQmtmM",
  "type": [
    "VerifiableCredential",
    "testSchema"
  ],
  "expirationDate": "2027-12-10T18:30:00Z",
  "issuanceDate": "2023-01-10T06:20:18Z",
  "issuer": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG",
  "credentialSubject": {
    "name": "varsha",
    "id": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG"
  },
  "credentialSchema": {
    "id": "sch:hid:testnet:zDKTDL2V3BYdmxzXZuE6oQhbGQG9Gp9QVFKtTWoSHhjt6:1.0",
    "type": "JsonSchemaValidator2018"
  },
  "credentialStatus": {
    "id": "https://api.jagrat.hypersign.id/hypersign-protocol/hidnode/ssi/credential/vc:hid:testnet:zCgvWJQqiwbB3MPhhtaWpoyroYVgyVwSKaLPyYXXQmtmM",
    "type": "CredentialStatusList2017"
  }
}
issue()
Signs a credential document and registers credential status on the Hypersign blockchain.
API Definition
issue(params: {
    credential: IVerifiableCredential;
    issuerDid: string;
    privateKeyMultibase: string;
  }): Promise<{ 
    signedCredential: IVerifiableCredential, 
    credentialStatus: CredentialStatus, 
    credentialStatusProof: CredentialProof
    credentialStatusRegistrationResult?: DeliverTxResponse }>;
Usage
const tempIssueCredentialBody = {
  credential, // unsigned credential generated using `generated()` method
  issuerDid: "did:hid:testnet:zJ4aCsFKNtk2Ph4GzCiiqDDs2aAbDLbnRcRCrvjJWMq3X",
  verificationMethodId: "did:hid:testnet:zJ4aCsFKNtk2Ph4GzCiiqDDs2aAbDLbnRcRCrvjJWMq3X#key-1",
  privateKeyMultibase: "zrv4EUum4pk24tpCmWewukQeJXYKy47kiEt7Xqd9mofaXfYk6yF4XwEgynHxzNFhaMV4PVhm6g66ahpGrpT8eD8cVbP"
}
​
const issuedCredResult = await hypersignVC.issue(tempIssueCredentialBody);    const {signedCredential, credentialStatus, credentialStatusProof, credentialStatusRegistrationResult }  = issuedCredResult;
Output
{
   "signedCredential":{
      "@context": [
         "https://www.w3.org/2018/credentials/v1",
         {
            "hs": "https://api.jagrat.hypersign.id/hypersign-protocol/hidnode/ssi/schema/sch:hid:testnet:zDKTDL2V3BYdmxzXZuE6oQhbGQG9Gp9QVFKtTWoSHhjt6:1.0:"
         },
         {
            "name": "hs:name"
         },
         "https://w3id.org/security/suites/ed25519-2020/v1"
      ],
      "id": "vc:hid:testnet:zCgvWJQqiwbB3MPhhtaWpoyroYVgyVwSKaLPyYXXQmtmM",
      "type": [
         "VerifiableCredential",
         "testSchema"
      ],
      "expirationDate": "2027-12-10T18:30:00Z",
      "issuanceDate": "2023-01-10T06:20:18Z",
      "issuer": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG",
      "credentialSubject": {
         "name": "varsha",
         "id": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG"
      },
      "credentialSchema": {
         "id": "sch:hid:testnet:zDKTDL2V3BYdmxzXZuE6oQhbGQG9Gp9QVFKtTWoSHhjt6:1.0",
         "type": "JsonSchemaValidator2018"
      },
      "credentialStatus": {
         "id": "https://api.jagrat.hypersign.id/hypersign-protocol/hidnode/ssi/credential/vc:hid:testnet:zCgvWJQqiwbB3MPhhtaWpoyroYVgyVwSKaLPyYXXQmtmM",
         "type": "CredentialStatusList2017"
      },
      "proof": {
         "type": "Ed25519Signature2020",
         "created": "2023-01-10T06:22:02Z",
         "verificationMethod": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG#key-1",
         "proofPurpose": "assertionMethod",
         "proofValue": "z5xGFtmPHzdizcRrYAGJqZZ5Ut9EijBwyLLW14mY7dPAUYuNkBYEvXM5xdcz9gqtcW2sCCZQXGFNoqfoPCBQeDR1L"
      } 
   },
   "credentialStatus":{
      "claim":{
         "id":"vc:hid:testnet:z2g2Ty13EYau1tLUJgJtZ5xcvLLcywwzX3H2785ro5HJW",
         "currentStatus":"Live",
         "statusReason":"Credential is active"
      },
      "issuer":"did:hid:testnet:z5DErRspu8PTZf8W8WNy35mKBpL9bryp1i58hGz1kBtLL",
      "issuanceDate":"2023-01-09T11:17:15Z",
      "expirationDate":"2027-12-10T18:30:00Z",
      "credentialHash":"2f8722f72bd9dc5d2ebe51104bdc5983a80c4e1f5a20e6ba4758162b2d910cac"
   },
   "credentialStatusProof":{
      "type":"Ed25519Signature2020",
      "created":"2023-01-09T11:17:16Z",
      "updated":"2023-01-09T11:17:16Z",
      "verificationMethod":"did:hid:testnet:z5DErRspu8PTZf8W8WNy35mKBpL9bryp1i58hGz1kBtLL#key-1",
      "proofValue":"F+PETguuXqJyfbWSimVEPlQ4pon815ovGVU9++aA2JhD8Yz/A2C02WQDqe1uztFDiQTZMtWqm5mNHrxCHHrrBw==",
      "proofPurpose":"assertion"
   },
   "credentialStatusRegistrationResult":{
      "code":0,
      "height":1482453,
      "rawLog":"[{\"events\":[{\"type\":\"message\",\"attributes\":[{\"key\":\"action\",\"value\":\"/hypersignprotocol.hidnode.ssi.MsgRegisterCredentialStatus\"}]}]}]",
      "transactionHash":"59A3F0566C05853085EB3C4239857E77B6C658B0D929D11FA18AAA7B03AE6A50",
      "gasUsed":92561,
      "gasWanted":106334
   }
}
Note: When we issue credential, only cryptographic hash of the credential document get stored on the blockchain for privacy purpose and security purpose. The credentialHash in credentialStatus is a digest of the verifiable credential, generated using sha256 hashing algorithm which is of length 256 bits and is represented into 64 HEX characters.
verify()
Verfies signed/issued credential
API Definition
verify(params: {
    credential: IVerifiableCredential; // Signed/issued Hypersign credentail document
    issuerDid: string;
    verificationMethodId: string;
  }): Promise<object>
Usage
const params = {
      credential: signedCredential,
      issuerDid: didDocId,
      verificationMethodId,
    };
const verificationResult = await hypersignVC.verify(params);
Output
{
  "verified": true,
  "results": [
    {
      "proof": {
        "@context": [
          "https://www.w3.org/2018/credentials/v1",
          {
            "hs": "https://api.jagrat.hypersign.id/hypersign-protocol/hidnode/ssi/schema/sch:hid:testnet:zDKTDL2V3BYdmxzXZuE6oQhbGQG9Gp9QVFKtTWoSHhjt6:1.0:"
          },
          {
            "name": "hs:name"
          },
          "https://w3id.org/security/suites/ed25519-2020/v1"
        ],
        "type": "Ed25519Signature2020",
        "created": "2023-01-10T06:22:02Z",
        "verificationMethod": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG#key-1",
        "proofPurpose": "assertionMethod",
        "proofValue": "z5xGFtmPHzdizcRrYAGJqZZ5Ut9EijBwyLLW14mY7dPAUYuNkBYEvXM5xdcz9gqtcW2sCCZQXGFNoqfoPCBQeDR1L"
      },
      "verified": true,
      "verificationMethod": {
        "id": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG#key-1",
        "type": "Ed25519VerificationKey2020",
        "controller": "did:hid:testnet:zE1tjuapkmcpE32HDYH6dPDaMmVuRzLLQVuMBPHBZr7gG",
        "publicKeyMultibase": "z6MksU9nVq5C7AJh9X7vDr4UEK8Mb5BHQDamBvG7DZ9amLTe"
      },
      "purposeResult": {
        "valid": true
      }
    }
  ],
  "statusResult": {
    "verified": true
  }
}
resolveCredentialStatus()
Resolves credential status from Hypersign Blokchain and returns status of the credential of type CredentialStatus
API Definition
resolveCredentialStatus(params: { credentialId }): Promise<CredentialStatus>;
​
Usage
const verificationResult = await hypersignVC.verify({ credentialId });
Output
{
  "claim": {
    "id": "vc:hid:testnet:zAkr6Ct7WKv2gtnJnNSbfRGAURXPVtepQpC8L6zDYbswb",
    "currentStatus": "Live",
    "statusReason": "Credential is active"
  },
  "issuer": "did:hid:testnet:z6ghGJCnWz4VRK6DgPQYWkcMiaGeEDoxF2EQCjSvQbejG",
  "issuanceDate": "2023-01-10T16:28:01Z",
  "expirationDate": "2027-12-10T18:30:00Z",
  "credentialHash": "82b797d50e3593c167e46ef2081b36648706c23ddcfe534eb28c0a7120f2d692",
  "proof": {
    "type": "Ed25519Signature2020",
    "created": "2023-01-10T16:28:05Z",
    "updated": "2023-01-10T16:28:05Z",
    "verificationMethod": "did:hid:testnet:z6ghGJCnWz4VRK6DgPQYWkcMiaGeEDoxF2EQCjSvQbejG#key-1",
    "proofPurpose": "assertion",
    "proofValue": "XOxpztZxRSzWdyQVF8G3wEK3JKENkDPLV8Rsbv1IYvCfDmI7Icjq0yRAakcxBPGNKmjdCoR0uAKCc2f7eRxeAA=="
  }
}
updateCredentialStatus()
Updates credential status into Hypersign Blokchain
API Definition
updateCredentialStatus(params: {
    credentialStatus: CredentialStatus;
    issuerDid: string;
    verificationMethodId: string; // vermethod of issuer for assestion
    privateKeyMultibase: string;
    status: string;
    statusReason?: string;
  }): Promise<DeliverTxResponse>
Usage
​
const params = {
      credentialStatus,
      issuerDid: didDocId,
      verificationMethodId,
      privateKeyMultibase,
      status: 'SUSPENDED', 
      statusReason: 'Suspending this credential for some time',
};
const updatedCredResult = await hypersignVC.updateCredentialStatus(params);
Supported status: LIVE, SUSPENDED, REVOKED and EXPIRED. Please read the doc for more details about status.
Output
{
  code: 0,
  height: 1501029,
  rawLog: '[{"events":[{"type":"message","attributes":[{"key":"action","value":"/hypersignprotocol.hidnode.ssi.MsgRegisterCredentialStatus"}]}]}]',
  transactionHash: '462CAC8DBA88276975B67D1A7DC1AD9895290FB8D307E5371DAE1F02F8F75676',
  gasUsed: 96250,
  gasWanted: 111176
}
Security Concerns
// TODO
​
​
​
​
Hypersign Schema SDK
Hypersign Verifiable Presentation SDK
Last modified 5mo ago
Hypersign Verifiable Credential SDK

HypersignVerifiableCredentail SDK

NOTES

Table of Contents

Install The Package

Import The Package

APIs

Initialize instance of HypersignVerifiableCredential with offlineSigner

`generate()`

`issue()`

`verify()`

`resolveCredentialStatus()`

`updateCredentialStatus()`

Security Concerns
