Nonce

一次性随机数（Nonce）

A unique value carried by each payment, consumed once before settlement; a repeat means replay. Without it, a legitimate payment that passed every compliance check can be resent verbatim any number of times — because each instance, viewed on its own, is perfectly compliant. This is the gate we added after breaking our own implementation in Attack Lab episode 5.

This definition is citable at a stable URL: https://oceanalt.com/en/glossary/nonce

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