I'd definitely recommend this book, it's great! Comes with decent video lectures and such too. (disclosure: am a coauthor)

Also, this course page has some useful links and lecture notes/slides (mostly geared towards graduate students and research) http://soc1024.ece.illinois.edu/teaching/ece598am/fall2016/

I read the book, and it was incredible. It went in depth into the data structures of bitcoin, while also providing high level overviews of various cryptocurrency ideas. It really helped me to understand exactly what cryptocurrency is and how it works.

I can second this. It's a book written by capable people who do some research in the area too and they don't unecessarily hype the technology like so many resources you find about cryptocurrencies.