This looks like a great presentation for children of a complex topic. I wish there was more of this but for different, more important, topics, like PGP for example.<p>The graphics are nice, are they AI? Isn't there a copyright issue using such graphics?<p>Digital currencies are a terrible concept and I was always against it, it's basically the opposite of decentralization due to the exchanges & the complexity of the subject rendering most users at the mercy of a few in the know. On top of that, in practice, digital currencies are used for the worst things humanity has to offer! But one can hope that young people will learn useful concepts from pursuing the subject.<p>edit: I'm also wondering, why don't they offer a true javascript shell instead of a fake one? When asked to run the `echo $sig | xxd -r -p` command. The benefit would be that the user can experiment some more with the command line.