See the authors list. One of them, Zhengli-Li Shi, moved to Wuhan (of all places) and continued the research there after it was banned by US government.
there is no marketing etc in this book. it is by far the best book on the topic. it covers only bitcoin, i.e. no etherium/smartcontracts etc, but it does that really well. and in fact all the other blockchains are more or less the same
until recently we had JS scripting support in the editor, i.e. you could write logic in JS and attach it to various UI elements etc. we disabled it about one month ago because of major JS API overhaul.
we will enable it back in about one month or so and you will be able to do that and many other things in a clip.