gistfile1.txt

const bitGoUTXO = require('bitgo-utxo-lib');
const wif = '******';

const inputAmount = 1000000;
const minerFee = 1000;
const inputTxId = '83ec80bdecd69def653209f86d45621d54885c3def2590a62eb8bc7218477e27';
const inputOutputN = 0;
const toAddress = 't1YjypJzDtHkPZVQ8nLu5xFGxbBPjydK2SS';
const inputScriptHex = '76a9140ec26089e8b143fc7bea13a7340ee3b0e6c123f688ac';
const inputScript = Buffer.from(inputScriptHex, 'hex');

const hashType = bitGoUTXO.Transaction.SIGHASH_ALL;

const zecNetwork = bitGoUTXO.networks.zcash;
const builder = new bitGoUTXO.TransactionBuilder(zecNetwork);
builder.setVersion(bitGoUTXO.Transaction.ZCASH_SAPLING_VERSION);
builder.setVersionGroupId(parseInt('0x892F2085', 16));
const keyPair = bitGoUTXO.ECPair.fromWIF(wif, zecNetwork);
builder.addInput(inputTxId, inputOutputN);
builder.addOutput(toAddress, inputAmount - minerFee);
builder.sign(0, keyPair, inputScript, hashType, inputAmount);
const signedTransaction = builder.build();

console.log(signedTransaction.toHex());