I'm talking in general, not something specific.
When someone wants to show proof about something, the easiest way to do it is by signing a message.
By doing that, it is clear to everyone that they are in control of a BTC address and the writer of the exact message.
I'm not asking for any proof, just mentioning that if someone needs proof, that's the best way to do so.
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.