index.js

/* 
  inspired by https://www.youtube.com/watch?v=msT3tpwnyv8&list=PLS5SEs8ZftgXlCGXNfzKdq7nGBcIaVOdN
*/

var Tx = require('ethereumjs-tx');
require('dotenv').config();
const Web3 = require('web3');
const web3 = new Web3('https://ropsten.infura.io/v3/' + process.env.INFURA_KEY);

const account = process.env.ACCOUNT;
const privateKey = Buffer.from(process.env.PRIVATE_KEY, 'hex'); //convert to binary data

const contractData = '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// get the transaction count for account 1
web3.eth.getTransactionCount(account)
    .then(count => {
        //build the transaction with hex params
        const txParams = {
            nonce: web3.utils.toHex(count),
            data: contractData,
            gasPrice: web3.utils.toHex(web3.utils.toWei('10', 'gwei')),
            gasLimit: web3.utils.toHex(4700000)
        };

        const tx = new Tx(txParams);

        //sign the transaction with the private key (binary data)
        tx.sign(privateKey);

        // serialize the transaction
        const serializedTx = tx.serialize();

        // make a raw version
        const raw = '0x' + serializedTx.toString('hex');

        //broadcast the transaction
        web3.eth.sendSignedTransaction(raw)
            .then(result => {
                console.log("Tx hash: ", result);
            }).catch(error => console.log("Broadcasting error : ", error));
        }
    ).catch(error => console.log("Error outer: ", error));;

// use code below to verify the contract:
// const contract = new web3.eth.Contract(abi, contractAddress);
// contract.methods