Blockchain vs. Bullshit--Antonopoulos THIS IS A MUST WATCH!!!
Andreas Antonopoulos has many excellent lectures, but this one takes the cake.
He's one of the few people who both understands the technology on its most detailed level and is capable of presenting it in a way that the layman can understand.
If you're ever in doubt about your cryptocurrency investments due yourself a favor and watch this video.
He is becoming more vocal lately. But hearing blockchain where is meant database can get under your skin at some point.