No particular software or operating system is required to follow the book's content, apart from an up-to-date version of a web browser and an internet connection to download source code examples and the tools suggested in the book. A good understanding of the plaforms such as Hyperledger, Fabric, and Ethereum can be an added advantage. Previous knowledge of blockchain technology would be beneficial, but is not strictly necessary. To get the most out of the book, you are expected to be fluent in networking security core concepts and to have some exposure to a general-purpose programming language.

If you are using the digital version of this book, we advise you to type the code yourself or access the code via the GitHub repository (link available in the next section). Doing so will help you avoid any potential errors related to the copying and pasting of code.

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.packtpub.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.
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/-Securing-Blockchain-Networks-like-Ethereum-and-Hyperledger-Fabric. 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!

Code in Action videos for this book can be viewed at https://bit.ly/2xZyAoE.

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://static.packt-cdn.com/downloads/9781838646486_ColorImages.pdf.

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: "An example of a Bitcoin address follows: mwog86wxZsWf6KGufzwA69xbvzE9TGZ5vA."

A block of code is set as follows:

>>> import math
>>> print math.gcd (5, 72)
>>> 1

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

bitcoin-cli getnewaddress