System design interview question
"Design a real-money multiplayer card game — poker or rummy. Players sit at tables, stake money on each hand, and the platform takes a commission. The cards must be provably fair, collusion between players is a real threat, and money moves on every hand."
an adversarial real-money game, where the distinguishing problems are trust rather than scale. Three specific hard parts: the shuffle must be verifiably random and unknowable to anyone including the operator, money movement per hand must be atomic and auditable, and players can collude in ways no protocol prevents.
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