With the attention MITs blockchain course is getting, I would like to remind everyone that Berkeley has 4 freely accessible courses listed, 2 with certificates available
Berkeley offers 4 courses on the subject, all free to access, 2 with certificates. Berkeley has been involved with blockchain a bit longer than MIT, and having taken the MIT Sloan course and Berkeley edX courses myself I can say that Berkeley is quite a bit more informative on the cryptocurrency and the technical side of things.
2 are courses are offered through edX that have optional paid certificates available.
2 are courses they offer through University that have publicly accessible course materials on their decal page.