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PROOF.md

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Generating a Proof with Polygon ID SDK

Generating a proof is a critical process in a credential-based system. After you have successfully fetched and saved credentials using the Polygon ID SDK, you can generate a proof for authentication with a verifier.

To authenticate yourself with a verifier provider, you will need to have previously completed all the preparatory steps and have credentials in your wallet. Once these prerequisites are met, you can connect to a verifier, like the test one at https://verifier-testing.polygonid.me/, and use the authenticate method.

This time, however, the Iden3MessageEntity will have a different format:

{
  "id":"385f246d-080a-4e32-941f-ad76595332b1",
  "typ":"application/iden3comm-plain-json",
  "type":"https://iden3-communication.io/authorization/1.0/request",
  "thid":"385f246d-080a-4e32-941f-ad76595332b1",
  "body":{
    "callbackUrl":"https://self-hosted-testing-testnet-backend-platform.polygonid.me/api/callback?sessionId=229765",
    "reason":"test flow",
    "scope":[
      {
        "id":1,
        "circuitId":"credentialAtomicQuerySigV2",
        "query":{
          "allowedIssuers":["*"],
          "context":"https://raw.githubusercontent.com/iden3/claim-schema-vocab/main/schemas/json-ld/kyc-v3.json-ld",
          "credentialSubject":{
            "birthday":{
              "$lt":20000101
            }
          },
          "type":"KYCAgeCredential"
        }
      }
    ]
  },
  "from":"did:polygonid:polygon:mumbai:2qFXmNqGWPrLqDowKz37Gq2FETk4yQwVUVUqeBLmf9"
}

The authenticate method will be used the same way as when you authenticated your identity with the test issuer:

Future<void> authenticate({
    required Iden3MessageEntity message,
    required String genesisDid,
    BigInt? profileNonce,
    required String privateKey,
    String? pushToken,
});

Remember to replace the message, genesisDid, profileNonce (if needed), and privateKey parameters with the correct values. The pushToken parameter is optional.

The Iden3MessageEntity can be obtained by passing the scanned String to this sdk methods:

Iden3MessageEntity message = await PolygonIdSdk.I.iden3comm.getIden3Message(
  message: "YOUR_SCANNED_STRING"
);

After you send the request and the operation is successful, the verifier will use the callback URL specified in the message to return the result of the verification process.