function start() {
    console.log("Starting...")
    var output = document.getElementById('output')

    subscription = web3.eth.subscribe('pendingTransactions', function (error, result) {
    })
        .on("data", function (transactionHash) {
            web3.eth.getTransaction(transactionHash)
                .then(function (transaction) {
                    createNode(transaction.from, transaction.to);
                });
        })
    
}