Funny how hard it is to find what this book actually entails. You go on the Website and it says:

This is the fourth edition of “Distributed Systems. We have stayed close to the setup of the third edition, including examples of (part of) existing distributed systems close to where general principles are discussed. […]

No word what it is actually about. So you go to Amazon:

This is the fourth edition of “Distributed Systems.” We have stayed close to the setup of the third edition, including examples of (part of) existing distributed systems close to where general principles are discussed. […]

Then you look on the books backcover and it says:

This is the fourth edition of “Distributed Systems.” We have stayed close to the setup of the third edition, including examples of (part of) existing distributed systems close to where general principles are discussed. […]

I give up.

I guess the take away is:

For example, we have included material on blockchain systems, and discuss their various components throughout the book.

Trust me bro.