Bitcoin Cash P2SH input -> P2PKH output example w/ BITBOX

p2sh-input.js

const mnemonic = "";

// root seed buffer
const rootSeed = BITBOX.Mnemonic.toSeed(mnemonic);

// master HDNode
const masterHDNode = BITBOX.HDNode.fromSeed(rootSeed, "bitcoincash");

// HDNode of BIP44 account
const account = BITBOX.HDNode.derivePath(masterHDNode, "m/44'/145'/0'");

// derive HDNode
const node = BITBOX.HDNode.derivePath(account, "0/0");
const cashAddress = BITBOX.HDNode.toCashAddress(node);
const script = BITBOX.Script.encode([
  Buffer.from("BOX", "ascii"),
  BITBOX.Script.opcodes.OP_CAT,
  Buffer.from("BITBOX", "ascii"),
  BITBOX.Script.opcodes.OP_EQUAL
]);

// hash160 script buffer
const p2sh_hash160 = BITBOX.Crypto.hash160(script);

// encode hash160 as P2SH output
const scriptPubKey = BITBOX.Script.scriptHash.output.encode(p2sh_hash160);

// get p2sh address from output script
const p2shAddress = BITBOX.Address.fromOutputScript(scriptPubKey);

BITBOX.Address.utxo(p2shAddress).then(result => {
  if (!result[0]) return;

  const transactionBuilder = new BITBOX.TransactionBuilder();

  // original amount of satoshis in vin
  const originalAmount = result[0].satoshis;

  // index of vout
  const vout = result[0].vout;

  // txid of vout
  const txid = result[0].txid;
  // return false;

  // create instance of Transaction Builder class
  transactionBuilder.addInput(txid, vout);

  // set fee and send amount
  let fee = 550;
  let sendAmount = originalAmount - fee;

  // add output
  transactionBuilder.addOutput(cashAddress, sendAmount);

  // encode locking script
  let encodedScript = BITBOX.Script.encode(script);

  // HDNode to keypair
  let keyPair = BITBOX.HDNode.toKeyPair(node);

  // create unlocking script
  let script2 = [Buffer.from("BIT", "ascii")];

  // concat scripts together
  let children = script2.concat(script);

  // encode scripts
  let encodedScript2 = BITBOX.Script.encode(children);

  // set input script
  transactionBuilder.addInputScript(vout, encodedScript2);

  // to hex
  // let hex = tx.toHex();
  const hex = transactionBuilder.build().toHex();

  // POST to BCH network
  BITBOX.RawTransactions.sendRawTransaction(hex).then(
    result => {
      console.log(result);
    },
    err => {
      console.log(err);
    }
  );
});