This Second Edition introduces the technical features that make up blockchain technology today, including the numerous changes that have occurred since the publication of the prior edition. The author begins with an updated explanation of all technological concepts necessary to understand any discussions related to distributed ledgers and a short history of earlier implementations. The book covers the Ethereum network, cryptocurrencies running on top of the network, and smart contracts, and the various private and public platforms. The author also presents an up-to-date overview of the blockchain networks that readers can use to build solutions of their own and the tools that can help them in the process. This new edition expands upon the first edition by incorporating discussion of recent developments in the blockchain landscape, including major events and new algorithms.