Ethereum Cookbook

How to do it...

We will now learn how we can send raw transactions:

1. You need to sign your transaction before broadcasting it to an Ethereum network. If you are using the existing version of web3.js (0.2x.x), this operation is not built in. Install ethereumjs-tx via npm to sign transactions easily:

$ npm install ethereumjs-tx --save

2. Once it is installed, import it into your project and create the transaction object to sign:

// For web3.js 0.2x.xvar Tx = require("ethereumjs-tx");var rawTx = {
  nonce: "0x00",
  gasPrice: "0x09184e72a000", 
  gasLimit: "0x2710",
  to: "0x0000000000000000000000000000000000000000", 
  value: "0x00", 
  data: "0x3f9263449875000000000000000000000000000000000000000000000000000000000009"
}var tx = new Tx(rawTx);

Use the following ...