‘All The Gory Details’
I read this a couple of months ago and (unless I’ve missed something) never put a mention of it up here.
Anyway, if you want to go further down the bitcoin rabbit-hole than just the basics, this is the book to get. It has some code, but not too much, and it goes into quite some detail about wallet seeds and UTXOs (which should give you some idea of the level we’re dealing with here).
There are more detailed descriptions of everything available elsewhere, but this is all one nice package.