get_public_keys_and_signatures.mjs

import bitcore from 'bitcore-lib-cash';

const {
  crypto: { BN, Signature },
  PublicKey,
  Script,
  Transaction,
} = bitcore;

function main(txHex, satoshisStr) {
  const tx = new Transaction(txHex);
  const scriptSig = tx.inputs[0].script;
  const signatureChunks = scriptSig.chunks.slice(1, -1);
  const signatures = signatureChunks.map(chunk => Signature.fromTxFormat(chunk.buf));
  const redeemScript = Script.fromBuffer(scriptSig.chunks.slice(-1)[0].buf);
  const publicKeyChunks = redeemScript.chunks.slice(1, -2);
  const publicKeys = publicKeyChunks.map(chunk => PublicKey.fromBuffer(chunk.buf));
  const satoshisBN = BN.fromString(satoshisStr);
  const result = {};

  publicKeys.forEach((publicKey) => {
    result[publicKey.toString()] = [];
    signatures.forEach((signature) => {
      if (tx.verifySignature(signature, publicKey, 0, redeemScript, satoshisBN)) {
        result[publicKey.toString()].push(signature.toString());
      }
    });
  });

  console.log(result);
}

const txHex = process.argv[2];
const satoshisStr = process.argv[3];

main(txHex, satoshisStr);