Revoke Identifier

When a user wants to change their identifier or their account address in the mapping, the identifier needs to be revoked first and then re-registered again with the new account or the new identifier.

The user might want to do this because they either changed their identifier (Eg: Phone Number) or they want their identifier to point to a new address.

Below is the code snippet to revoke an identifier under your issuer.

⚠️

The user can revoke the identifier themselves without the need of the issuer, it is recommended to monitor the FederatedAttestations.sol contract for AttestationRevoked event

Get obfuscated Id and Revoke Obfuscated Id on FederatedAttestations.sol

import { IdentifierPrefix } from "@celo/identity/lib/odis/identifier";
import { federatedAttestationsABI } from "@celo/abis";
import {
  createWalletClient
  getContract,
  http,
  Hex,
  http
} from "viem";
import { celo, celoAlfajores } from "viem/chains";
import { getObfuscatedId } from "./getObfuscatedId";
 
const chain =
  process.env.NEXT_PUBLIC_ENVIRONMENT === "TESTNET" ? celoAlfajores : celo;
 
const publicClient = createPublicClient({
  chain,
  transport: http(),
});
 
let wallet = createWalletClient({
  account,
  chain,
  transport: http(),
});
 
async function getAccountAddress() {
  return (await wallet.getAddresses())[0];
}
 
const FA_PROXY_ADDRESS =
  process.env.NEXT_PUBLIC_ENVIRONMENT === "TESTNET"
    ? "0x70F9314aF173c246669cFb0EEe79F9Cfd9C34ee3"
    : "0x0aD5b1d0C25ecF6266Dd951403723B2687d6aff2";
 
const NOW_TIMESTAMP = BigInt(Math.floor(new Date().getTime() / 1000)); // Current UNIX timestamp
 
const federatedAttestationsContract = getContract({
  address: FA_PROXY_ADDRESS,
  abi: federatedAttestationsABI,
  client: wallet,
});
 
async function revokeIdentifier(plaintextId, address) {
 
  const obfuscatedId = await getObfuscatedId(
    plaintextId,
    IdentifierPrefix.PHONE_NUMBER
  );
 
  const issuerAddress = await getAccountAddress();
 
  const hash =
    await federatedAttestationsContract.write.revokeAttestation(
    [obfuscatedId, issuerAddress, address]
  );
 
  const receipt = await publicClient.waitForTransactionReceipt({ hash });
 
  return receipt;
}