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Can you provide an example? I don't gamble using btc, I prefer trx and doge because they are faster and cheaper. And everyone here agrees that for slot machines from pragmatic it is necessary to attach replays. That's enough proof, if you don't believe it then that's your problem and I don't want to prove anything to you here
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.