Alchemy NFT API JS Version - Script to Get NFT Contract Creator Address

getCreatorFromContract.js

import { Network, Alchemy } from "alchemy-sdk";

const settings = {
  apiKey: process.env.ALCHEMY_API_KEY, // Replace with your Alchemy API Key.
  network: Network.ETH_MAINNET, // Replace with your network.
};

const alchemy = new Alchemy(settings);

export async function getCreatorFromContract(contractAddress) {
  // making sure there is contractAddress
  if (!contractAddress) return;

  // searching for the block
  async function binarySearch(low = 0, high = 0, contract_address) {
    // Check base case
    if (high >= low) {
      const mid = parseInt((high + low) / 2);
      const midHex = "0x" + mid.toString(16);

      if (high === low) return low;
      if ((await alchemy.core.getCode(contract_address, midHex)) !== "0x") {
        return await binarySearch(low, mid, contract_address);
      } else if (
        (await alchemy.core.getCode(contract_address, midHex)) === "0x"
      ) {
        return binarySearch(mid + 1, high, contract_address);
      }
    } else return -1;
  }

  try {
    const currNum = await alchemy.core.getBlockNumber();
    const arr = Array.from({ length: currNum }, (v, i) => i);
    const resultBlockNum = await binarySearch(
      0,
      arr.length - 1,
      contractAddress
    );
    // return number

    // convert result to hex number
    const resultBlockNumHex = "0x" + resultBlockNum.toString(16);

    // get all transaction from that block
    const transactionReceipts = await alchemy.core.getTransactionReceipts({
      blockNumber: resultBlockNumHex,
    });
    // transactionReceipts will return an object

    const receipts = transactionReceipts.receipts;
    // receipts will return an array of transactions

    const ownerAddress = receipts.filter(
      (receipt) => receipt.contractAddress === contractAddress
    )[0].from;

    return ownerAddress;
  } catch (err) {
    console.log(err);
  }
}

// To get the creator from NFT Contract (using goldeneggclub collection as example) - https://opensea.io/collection/goldeneggclub
getCreatorFromContract("0x2a870463492deec8b8f01489c4c476053d017eda").then(console.log);
// result: 0xb43eebac012cb2f12e1ec258a6ece20a7aa4712f