Sending bitcoin transaction with bitcore

bitcoreSample.js

var bitcore = require('bitcore-lib');
var Transaction = bitcore.Transaction;
var explorers = require('bitcore-explorers');
var bitcoinaddress = require('bitcoinaddress');
var c2p = require('callback-promise');

const insight = new explorers.Insight('testnet');

var privateKey = bitcore.PrivateKey.fromWIF('cW4r4rajDoKwpEgRPkyF7w7HLaZ7R9zBEDwHtVf2RR1EyBCggESB');
var address = privateKey.toAddress('testnet').toString();

var address2 = 'mz5HhsVBJsY7BFSvbtDefvdvaNzTvmsawp';
const senderWalletTest = {
    publicKey: address,
    privateKey: 'cW4r4rajDoKwpEgRPkyF7w7HLaZ7R9zBEDwHtVf2RR1EyBCggESB'
}

const sendBTC = async (senderWallet, to, amount) => {
    const unit = bitcore.Unit;
    const minerFee = unit.fromMilis(0.128).toSatoshis(); // cost of transaction in Satoshis
    const transactionAmount = unit.fromMilis(amount).toSatoshis(); // convert BTC to Satoshis

    // Casting callbacks to promises
    const getUnspentUtxos = c2p(insight, 'getUnspentUtxos', 1, 0);
    const broadcast = c2p(insight, 'broadcast', 1, 0);

    const utxos = await getUnspentUtxos(senderWallet.publicKey);
    const tx = Transaction()
        .from(utxos) // Feed information about what unspent outputs one can use
        .to(address2, transactionAmount) // Add an output with the given amount of satoshis
        .change(address) // Sets up a change address where the rest of the funds will go
        .fee(minerFee)
        .sign(privateKey)
        .serialize();

    return broadcast(tx);
}

const getAddressInfo = c2p(insight, 'address', 1, 0);
getAddressInfo(address).then((r) => {
    console.log(r.balance)
});

sendBTC(senderWalletTest, address2, 1)
    .then((result) => {
        console.log('Success ', result);
    })
    .catch((err) => {
        console.log('Error ', err);
    });