EthrRevocationRegistry Veramo Plugin

A CredentialStatusPlugin plugin for the Veramo agent enabling it to resolve the status of a Verifiable Credential using the EthrRevocationRegistry revocation method. It leverages @spherity/ethr-revocation-registry-controller to interact with an EIP-5539-compliant revocation regsitry on Ethereum.

Setup

1. Install this plugin

   npm install --save @spherity/ethr-revocation-registry-veramo-plugin @veramo/credential-status

2. Add the plugin to your agent

   import { CredentialStatusPlugin } from "@veramo/credential-status";
   import { EthrRevocationRegistry } from "@spherity/ethr-revocation-registry-veramo-plugin;
   ...
      
   export const veramoAgent = createAgent<VeramoAgent>({
     ...,
     plugins: [
       new CredentialStatusPlugin({
         ...new EthrRevocationRegistry({
           infuraProjectId: "abcde123"
         }).asStatusMethod,
         // OR
         ...new EthrRevocationRegistry({
           chainConnectionInstruction: [
             {
               chainId: 1337,
               address: "0x",
               provider: new ethers.providers.JsonRpcProvider('http://127.0.0.1:8545')
             },
             {
               chainId: 1,
               address: "0x",
               provider: new ethers.providers.JsonRpcProvider('http://example.mainnet.quiknode.pro/token/')
             },             
           ]
         }).asStatusMethod
       }),           
     ],
   });

Usage

The revocation check can happen in two ways:

• Implicitly: When using Veramo's agent.verifyCredential({...}) on LD-credentials, the verification will automatically do a revocation check in the background. In those cases, you have to wrap this call in a try-catch block as a failed verification will results in Veramo throwing an error (Error: Error verifying LD Verifiable Credential). Doing a verification on a credential with a JWT proof won't make this implicit check.
• Explicit: An LD or JWT-credentials revocation status can also be checked explicitly via veramoAgent.checkCredentialStatus({credential: vc} where the vc can either be a credential object or a JWT string. This will return a CredentialStatus object that has a revoked property.

Example

import { CredentialPayload, W3CVerifiableCredential } from '@veramo/core'
import { veramoAgent } from './setup';

async function main() {
  const did = "did:ethr:rinkeby:0x036dffee0bfd09d6a542f57e457cacbb4b0df91fc02bdb478f05d6db085a1da8e8"
  const credential: CredentialPayload = {
    "@context": [
      "https://www.w3.org/2018/credentials/v1",
      "https://www.w3.org/2018/credentials/examples/v1",
      "https://raw.githubusercontent.com/spherity/vc-ethr-revocation-registry/contexts/ethr-revocation-registry.jsonld"
    ],
    "id": "http://example.edu/credentials/58473",
    "type": ["VerifiableCredential", "UniversityDegreeCredential"],
    "issuer": {"id": did},
    "issuanceDate": "2010-01-01T00:00:00Z",
    "credentialSubject": {
      "id": did,
      "degree": {
        "type": "BachelorDegree",
      }
    },
    "credentialStatus": {
      "id": "...",
      "type": "EthrRevocationRegistry",
      "registry": "0x0000000000000000000000000000000000000000" // optional. defaults to defaultRegistryAddress
      "chainId": 5, // optional. defaults to 1 (mainnet)
      "namespace": "0x6B6B873eaB06D331fFA6c431aC874Ff954A2c317",
      "revocationList": "0x3458b9bfc7963978b7d40ef225177c45193c2889902357db3b043a4e319a9628",
      "revocationKey": "0x89343794d2fb7dd5d0fba9593a4bb13beaff93a61577029176d0117b0c53b8e6"
    }
  };

  const verifiableCredential = await veramoAgent.createVerifiableCredential({ credential, proofFormat: "lds", });
   
  // Implicit: Revocation status of LD-credentials are automatically checked during verification
  try {
    await veramoAgent.verifyCredential({credential: verifiableCredential});
    console.log("Valid VC");
  } catch (e) {
    console.log("Invalid VC");
  }
  
  // Explicit: Revocation status of LD-credentials can also be checked explicitly. Mandatory for JWT-credentials.
  const revoked = await veramoAgent.checkCredentialStatus({credential: verifiableCredential})
}

main().catch(console.log)