It would be interesting if to prove the authenticity of the winnings, ss + replay + sig message is required. It sounds pretty crazy at first, but actually I don't know the use of sig messge in gambling winnings, can anyone tell me?
WTF mate?
There's no need to prove something as unimportant as your slots winning... And the reason for replay isn't so much about proving authenticity, but more about having fun watching it together.
People can brag all they want about their fake winnings, but it won't make them cool or whatever.
Anyway, if you insist on proofing slots winning, other than replay, you can always post your bet ID.... signed message isn't useful for this purpose.