~snip~
Signing a message is just to prove that someone has a full control of the address. You suggest something in general but you do it in a specific thread about slot game? Didn't you notice it? Hitting specific multiplier on slot game cant be proved by signing a message, I have no idea how can you talk about it here. You are talking too far away from the main idea of this topic, so just stop it and dont do it in other thread as I'm worrying that you may also talk about it in sports betting thread where some people share their winning bets then someone ask for proof and you suggest sign a message. That will be a big joke of the day.
Fair enough.
You can still write a message saying that you are the person that got that amazing score, or whatever it is.
The point that I'm trying to make is that a screenshot is worth nothing in these days. The only proof of authenticity is some kind of signature, and since this is a bitcoin message board, the best way to do it is by signing a message.
That at least gives you confidence that the person holding an address is saying something, not anyone around the world.