There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "You can, at any level, use console.log() to print the received values in the console."

A block of code is set as follows:

var bitcoin = require('bitcoinjs-lib');
var rp = require('request-promise');

Any command-line input or output is written as follows:

sudo add-apt-repository ppa:bitcoin/bitcoin 
sudo apt-get update

Bold: Indicates a new term, an important word, or words that you see on screen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "The customer can check the transaction details before proceeding with the payment by pressing the Transaction details button."