That's basically just a SHA256 hashing on pen and paper, doesn't have much to do with how bitcoin works.

To be fair, performing sha256 hashing is kind of the only work that Bitcoin is doing, from a kilowatt hour’s perspective.

technically it said “the hard way” not “the hardest way”. also, computing a hash != mining. mining needs forming the block and computing the hash

Same guy, Ken Shirriff