Main question: How was the exploit performed?
The casino used provably fair dice game. They were about to release new version for their site, before release they had separate beta website for small group of players to test and look for bugs before the final version would be released. I was one of those players who got access to the beta testing site. Finally the testing period was over and new version of the site was released to the public. The beta site was still online. The mistake that the casino made was that beta site account and main public site were sharing identical server seed. Meaning that i could reveal the server seed on the beta website while still having it active unrevealed on the main site. The way probably fair works is that with revealed server seed i could calculate all the future dice rolls before they would happen. And thats what i did. I did it for over 2 months i believe. I abused it in a way where it really looked like at the end i was just getting lucky and that the EV would catch up in the end. Over 2 month + period i was withdrawing big amounts in btc totalling thousands of bitcoins overall.
1. I still have majority of thay money.
2. I never felt guilt or wanted to return the money. Casino is a very shady business and the owners of these platforms dont care about their players or their losses and will do anything to milk their customers out of their last dollar. So i feel no sympathy. I outplayed them at their own game.
3. I did diversify my btc investment
4. Yes i am
5. I could sign wallet containing good chunk of those coins but I wouldnt say that would be the smartest thing to do
As long you aren't doing a long scam here, i don't even care if you are lying or not. As this this actually plausible explanation and a cool story. And definitely something that might have happened. Back then btc was cheap and tech was new, there were scams left and right, so different exploits that happened under the radar were definitely a thing. And no one seemed to track the missing money from real scams, so changes that anyone even noticed anything funny are probably small.
i can't see any good reason why you should sign the wallet. Because of what reason? To impress some random people in the internet? I definitely wouldn't. Although i am so paranoid that i would even make this tread, even though 10 years might have passed, and this crime might be expired in most countries.