I would like to congratulate the winner too!

(if there is a winner, that is)

Well, I am not sure if I should share this, but I have those doubts, it is eating me, and I and so many others invested so much our time in the puzzle, that it had better be cristal clear, and it seems not to be, so maybe I should drop it from my chest... and let others decide.

You see, the corresponding BCH address is not emptied: https://bitinfocharts.com/pl/bitcoin%20cash/address/1FLAMEN6rq2BqMnkUmsJBqCGWdwgVKcegd

But a winner technically savvy enough to solve THAT puzzle must of course realize that about 10% of the prize value is in BCH and about 1% in BTG. Protected by the same private key. The winner must have had a plan to get to all those addresses all at once, before the creators (who know the private key too) could withdraw the founds once they learn one of the addresses is emptied. I know, because it was my plan.

Only a person knowing that nobody else has the key could be reluctant and slow about removing the BCH funds.

So as I said: the situation seems not to be cristal clear. And with so much energy of everybody invested in this puzzle I thought I should share my doubts.