Obviously, the guy that invented BTC. I think I first learned about him after watching an unlisted documentary about BTC on youtube (can't remember where I found the link.
Some say he's no longer alive, some say he's changed his physical features to stay anonymous.
basically it's someone who already had deep knowledge of crypto systems, probably an academic or industry figure, because your average Joe is not going to come up with a groundbreaking crypto development. Signs also point to a British guy since the writing style matches and there were some British terms used, along with edit dates that generally match the London timezone