One Cardano transaction can spend several script outputs at once. If each validator only checks that it got paid, a single payment can satisfy all of them. That's multiple satisfaction, and our audit write-up walks through one.
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From Bugs to Breakthroughs: Auditing Cardano Smart Contracts
Why Cardano smart contracts need independent auditing, the risks that subtle on-chain interactions create, and how a rigorous audit finds them first.