This is a very good video about crypto currencies and Bitcoin. How they work, why most of it isn’t new, the problems and why they are not a currency. Unfortunately this video is in German language. I’m posting it anyway because I know that some of you speak German and others may want to try auto translation or may want to brush up their language skills 
This is a very good video about crypto currencies and Bitcoin. How they work, why most of it isn’t new, the problems and why they are not a currency.
Here is another one, in English, from a somewhat different point-of-view. I cannot compare them as I have no German.
It is very long (slightly over an hour).
https://tube.solari.com/videos/computer-security-161-cryptoc…
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