I've always had an uneasy feeling about all things blockchain and cryptocurrency, but after reading The Handwavy Technobabble Nothingburger by Stephen Diehl I'm even more convinced.
Not only are they a colossal waste of energy and physical resources, but they also show all the signs of being another instance of the insanity that lead to the Dot-Com Boom and Bust of the turn of the century.