The problem I have with puzzles like this is the ease with which this can be cheated. Let's take an example, someone creates a Puzzle like this and then they share the Private key with a friend (accomplice) and after a few hours or days the friend post the result and they claim the prize. The friend then gives the money back to the creator of the puzzle and they rinse and repeat the process.
What do they get out of this? Well, with a increase in the views and subscribers, the Youtube channel owner gets income and he could share that income with his friend.
How do we validate that the winner is not a friend or family member? Well, it's basically impossible and that is the main problem I have with these puzzles.

The only solution here is for you to get your ass crackin and let everyone know its real :-)
If I really wanted to "take the prize away" Im not sharing with a buddy ;-)
BUT the goal is to get more youtube subscribers ( thats why youtube exists IMO ) ... Like I said the bigger the channel, the bigger the prizes. I hope to educate myself and new users with the channel as well. Lots of people in my area still believe bitcoin is fake money. AND unfortunately there are a lot of bad actors in crypto. BUT they exist everywhere in life. They just choose to use real money now :-)
Good luck!