Bazinga442 - There have been several people from different territories contacting us via different channels to claim ownership of the account, with varying degrees of evidence provided. That's about as detailed as I can be without disclosing private information about the account in question unfortunately.
I'll post an update ASAP.
Thanks,
Ronnie @ Cloudbet
Can you provide an evidence that when exactly were you being contacted by users claiming that specific account to be theirs? Is our system so obsolete and easy to be beaten up when users still have got 2fa as well as an email set in their account? Why did you cancel OP's bet he made on SuperBowl? What was the specific reason to do that and how can anyone else other than OP knew about that bet and the win when it was done in private? So there doesn't stand a chance of anyone else contacting you to claim ownership of that account at first place.
@OP,
As others said, there's nothing to hide here and signing message doesn't really need anyone's (especially cloudbet's) concerns but it should be your priority to give it immediately as it'll help you a lot in your case here and cloudbet will be proven (somehow) guilty trying to steal away your wins.