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The bug description: 1.Server seed (secret seed) is revealed after a player changes his server seed to a new one.
2. Windice has a function to change the client seed only , without changing the server seed.
3. After the client seed was changed , due to the bug , some of the players were able to see the server seed in their past bets since it was identical to the one from the previous session.
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This situation is almost identical to what happened to PrimeDice several years ago:
https://medium.com/@Stunna/breaking-the-house-63f1021a3e6dYou guys are lucky that you discovered the exploit so fast and lost only 3 BTC. PrimeDice lost 2,400+ BTC because of the infamous hack.
I wish you best of luck with your investigation! Don't give a penny more to those disgusting buggers.