[dabent]

The "Bitcoin and Cryptocurrency Technologies" on Coursera helped me gain an understanding cryptocurrencies. Until I took that course I knew very little about the subject.

It's possibly a little dated now, but it's a good primer.

https://www.coursera.org/learn/cryptocurrency/

I'd love to hear what other cryptocurrency courses others recommend.

As many others mentioned, Andrew Ng's course on Machine Learning on Coursera was also very good.

https://www.coursera.org/learn/machine-learning

[chabes]

You might appreciate the Digital Currency MOOC from University of Nicosia, with Andreas Antonopoulos and Antonis Polemitis.

https://digitalcurrency.unic.ac.cy/free-introductory-mooc/

Latest live stream (with Andreas Antonopoulos) goes into Ethereum and alternative uses of the blockchain:

https://www.youtube.com/watch?v=PxyPNS5QmAI

Edit - Actually, the latest live stream is this one:

https://www.youtube.com/watch?v=h2aeToagyaA

Figured I'd leave both, since they cover similar topics

[miltosgm]

very interesting

[suddensleep]

Not a cryptocurrency course per se, but Dan Boneh's course on Cryptography[1] is an excellent introduction to most of the building blocks of cryptosystems, including the technology underlying most cryptocurrencies.

In terms of level, it is more than a little technical (programming exercises in both cryptography and cryptanalysis await you!), while still remaining far from rigorous (compared to, say, a graduate-level cryptography text).

[1]https://www.coursera.org/learn/crypto

[ctchocula]

Second this. Doing the homework assignments (especially the first one) helped me understand how transactions work and are validated.