Extract and Verify

Extract Details¶

Extract the publicKey, signature, and nonce from the proof attribute of the Verifiable Credential (VC). In this step, the vc.proof attribute is extracted from the Verifiable Credential (VC). The publicKey, signature, and nonce are then obtained by decoding the base64-encoded values from the proof attribute.

const vcProof = vc.proof;
const publicKey = Buffer.from(vcProof?.verificationMethod, "base64");
const signature = Buffer.from(vcProof?.proofValue, "base64");
const nonce = Buffer.from(vcProof?.nonce, "base64");

Verify Proof¶

The blsVerifyProof method is employed to verify the proof by passing the signature, publicKey, messages (previously created vcmessages array), and nonce.

const isProofVerified = await blsVerifyProof({
  proof: signature,
  publicKey,
  messages: vcmessages,
  nonce: nonce,
});

Next Steps¶

Finally, the value generated above in isProofVerified indicates if the proof has been verified successfully or not.