One possible theory :

If HufflePuff is Stunna, it is more easy to understand all the story ... isn't it ? He play with bitcoin and if he has lost (he will not lose anything, because the btc is "yours").
I don't think someone know the cold address of primedice, so we have not any possible and valid information. Ours are only possible theory, finally I want to ask if I may : why isn't it possible to invest on primedice?