const Web3 = require('web3');
//You must compile the smart contracts or use the official ABIs of the repository
const MoC = require('../../build/contracts/MoC.json');
const MoCBProxManager = require('../../build/contracts/MoCBProxManager.json');
const truffleConfig = require('../../truffle');
* Get a provider from truffle.js file
* @param {String} network
const getDefaultProvider = network =>
truffleConfig.networks[network].provider || truffleConfig.networks[network].endpoint;
* Get a gasPrice from truffle.js file
* @param {String} network
const getGasPrice = network => truffleConfig.networks[network].gasPrice || 60000000;
* Get a new web3 instance from truffle.js file
const getWeb3 = network => {
const provider = getDefaultProvider(network);
return new Web3(provider, null, {
transactionConfirmationBlocks: 1
const web3 = getWeb3('rskTestnet');
const gasPrice = getGasPrice('rskTestnet');
//Contract addresses on testnet
const mocContractAddress = '<contract-address>';
const mocBProxManagerAddress = '<contract-address>';
const execute = async () => {
web3.eth.defaultGas = 2000000;
* Loads an specified contract
* @param {ContractABI} abi
* @param {String} contractAddress
const getContract = async (abi, contractAddress) => new web3.eth.Contract(abi, contractAddress);
const strToBytes32 = bucket => web3.utils.asciiToHex(bucket, 32);
const moc = await getContract(MoC.abi, mocContractAddress);
throw Error('Can not find MoC contract.');
// Loading MoCBProxManager contract. It is necessary to compute user BTC2X balance
const mocBproxManager = await getContract(MoCBProxManager.abi, mocBProxManagerAddress);
throw Error('Can not find MoCBProxManager contract.');
const [from] = await web3.eth.getAccounts();
const redeemBtc2x = async (btc2xAmount, vendorAccount) => {
const weiAmount = web3.utils.toWei(btc2xAmount, 'ether');
console.log(`Calling redeem BTC2X with account: ${from}, amount: ${weiAmount}.`);
.redeemBProxVendors(strToBytes32(bucketX2), weiAmount, vendorAccount)
.send({ from, gasPrice }, function(error, transactionHash) {
if (error) console.log(error);
if (transactionHash) console.log('txHash: '.concat(transactionHash));
.on('transactionHash', function(hash) {
console.log('TxHash: '.concat(hash));
.on('receipt', function(receipt) {
.on('error', console.error);
const userBalance = await mocBproxManager.methods
.bproxBalanceOf(strToBytes32(bucketX2), from)
console.log('=== User BTC2X Balance: '.concat(userBalance.toString()));
const btc2xAmount = '0.00001';
const vendorAccount = '<vendor-address>';
await redeemBtc2x(btc2xAmount, vendorAccount);
.then(() => console.log('Completed'))
console.log('Error', err);