Check the OP... The guy who posted it and the Twitter guy coin_artist.

Here's the old solution which is rediculous.
https://pt.scribd.com/document/359412332/Bitcoin-Puzzle

Anyone know if this game is still relevant to this puzzle or did someone get past it? https://bitcointalk.org/index.php?topic=1488665.msg15012261#msg15012261

Also something brought up precisely is that this address holds some Leat counterparty assets, not sure if relevant.
https://counterpartychain.io/asset/LEAT