You are free to read from these books, which are both freely distributed and available online. Some readings may be pulled from these books during the course.
Bitcoin and Cryptocurrency Technologies Opens in new window by Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, and Steven Goldfeder
Mastering Bitcoin Opens in new window by Andreas Antonopoulos
Also, a good unofficial resource is the Blockchain at Berkeley Public Slack, where we discuss various topics related to blockchain. You can request access to our Slack workspace at the bottom of the Blockchain at Berkeley website Opens in new window, under “Join Blockchain at Berkeley on Slack.”
Note: the views expressed on the public slack do not reflect the views of the instructors for this course. Official course discussion should still occur on the edX discussion board.