I guess that the reason is to prove they know the private key. I guess that it was found by the large collider
thing, since, from what I know, they ask only for a % of the money after "cracking" the private key of a wallet.
As far as I know the "author" of this puzzle-transaction is unknown.
Whom are you asking?
I know.
I just tried to give some sort of reasoning behind what could mean that self-sending of those funds.
Anyone with a better idea is most welcome to share it
