detectAuthentic.ts

import { ImmutableX, Config, ListTransfersResponse } from '@imtbl/core-sdk';
import { ethers } from 'ethers';

const client = new ImmutableX(Config.PRODUCTION);

// fetch all of the transactions where an address has received a specific token
const listTransfersOfAssetPerUser = async (user: string, tokenId: string) => {
  let results: any[] = [],
    transactionResult: ListTransfersResponse | undefined;
  do {
    transactionResult = await client.listTransfers({
      receiver: user,
      tokenType: 'ERC20',
      assetId: tokenId,
      cursor: transactionResult?.cursor
    });
    
    results = results.concat(transactionResult?.result || []);
    console.log(`length: ${results.length}`);
  } while (transactionResult?.cursor);
  return results;
}

const detectAuthenticTokens = async (verifiedMinter: string, user: string, tokenId: string) => {
  const res = await listTransfersOfAssetPerUser(user, tokenId);
  let authentic = ethers.BigNumber.from('0'),
      inauthentic = ethers.BigNumber.from('0');
  for (const transfer of res) {
    if (transfer.user === verifiedMinter) {
      authentic = authentic.add(transfer.token.data.quantity);
    } else {
      inauthentic = inauthentic.add(transfer.token.data.quantity);
    }
  }
  return [authentic, inauthentic]
}

const main = async () => {
  const testData = {
    user: '0xc1dbe29a513ce9a1f7509318d94bd1b18fd3e9d1',
    verifiedMinter: '0xc2586d68fc53ef74fb9072ec3d16f844ea0ab37d',
    tokenId: '0xccc8cb5229b0ac8069c51fd58367fd1e622afd97'
  }
  const [authentic, inauthentic] = await detectAuthenticTokens(testData.verifiedMinter, testData.user, testData.tokenId);
  console.log("Authentic:   ", authentic.toString());
  console.log("Inauthentic: ", inauthentic.toString());
}

main()