Verify signature of example payload from beacon chain

signature_verify.mjs

import { ssz } from "@lodestar/types";
import { createBeaconConfig } from "@lodestar/config";
import { fromHexString, toHexString } from "@chainsafe/ssz";
import bls from "@chainsafe/bls";

// To run, first install dependencies:
// $ npm install @lodestar/types @lodestar/config @chainsafe/ssz @chainsafe/bls
//
// Then
// $ node signature_verify.mjs

const payload = {
  version: "capella",
  data: {
    message: {
      header: {
        parent_hash:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
        fee_recipient: "0xabcf8e0d4e9587369b2301d0790347320302cc09",
        state_root:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
        receipts_root:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
        logs_bloom:
          "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
        prev_randao:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
        block_number: "1",
        gas_limit: "1",
        gas_used: "1",
        timestamp: "1",
        extra_data:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
        base_fee_per_gas: "1",
        block_hash:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
        transactions_root:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
        withdrawals_root:
          "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
      },
      value: "1",
      pubkey:
        "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a",
    },
    signature:
      "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505",
  },
};

const headerRoot = ssz.capella.ExecutionPayloadHeader.hashTreeRoot(
  ssz.capella.ExecutionPayloadHeader.fromJson(payload.data.message.header)
);

// TODO: Set correct slot for domain's fork
const signingSlot = 0;
// TODO: Set to correct signing domain
const DOMAIN_EXECUTION_HEADER = new Uint8Array([0, 0, 0, 0]);
// TODO: Set to correct network's genesis validators root
const GENESIS_VALIDATORS_ROOT =
  "0x4b363db94e286120d76eb905340fdd4e54bfe9f06bf33ff6cf5ad27f511bfe95";

const config = createBeaconConfig({}, fromHexString(GENESIS_VALIDATORS_ROOT));

const domain = config.getDomain(signingSlot, DOMAIN_EXECUTION_HEADER);
const signingRoot = ssz.phase0.SigningData.hashTreeRoot({
  objectRoot: headerRoot,
  domain,
});

const isValid = bls.verify(
  fromHexString(payload.data.message.pubkey),
  signingRoot,
  fromHexString(payload.data.signature)
);

console.log({
  signingRoot: toHexString(signingRoot),
  isValid,
});