To get the most out of this book

A basic knowledge of JavaScript is recommended. You will also be required to install Node.js on your system.

The code and implementation of examples in this book were executed on macOS. However, if you want to implement all of these using a Windows PC, you will have to install the necessary requirements for it.

Download the example code files

You can download the example code files for this book from your account at www.packt.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Learn-Blockchain-Programming-with-JavaScript. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Conventions used

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: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."

A block of code is set as follows:

Blockchain.prototype.createNewBlock = function () { 

}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

Blockchain.prototype.createNewBlock = function (nonce, previousBlockHash, hash) { 

}

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

cd dev
touch blockchain.js  test.js

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: "Go to More Tools, and then select the Developer Tools option."

Warnings or important notes appear like this.

Tips and tricks appear like this.