This is an interesting story but would you be able to provide some proofs to us? Some people might have think that this is not good conversation but I think there's no harm on it if it happened 10 years ago, I'm pretty sure gambling sites already solved that exploit and managed to improve their security. I was curious what kind of exploit you've found and how would you be able to withdraw that money if you've made millions? I assume you also deposit a big amount and what kind of casino is that?
I think it came from third party casino games as those are the ones that are vulnerable from exploit.
I doubt that the OP will provide of about this story since he already mention before that will not gonna do that for obvious reason(privacy) since he might be legally charge for stealing to the casino.
Judging on the year and the amount involved. This is probably Primedice since there are only few casino back then that have a bankroll like that. Besides there’s news before that PD got hack with the exact amount and during that year.
Here’s the reply of OP that will answer your question.
I have access to some old wallets, however i will not sign or mention the casino where the exploit took place for obvious reasons. I have plenty of information and proof that this was a real incident back in 2014. Of course this bug doesn't work anymore and the casino has increased its security since then by a lot.