I've seen 80000 Bitcoin transfers recently, and no one knows who it is. Let's imagine. He has been holding BTC since 2011 and cannot have forgotten it, because he must be a tech geek with a clear understanding of BTC and is already a wealthy person. Otherwise, he wouldn't have stopped selling much midway. So why sell now? I guess what's going on, and I've already spent all the other money, but I still need a billion dollars to settle the matter?