Optimistic rollups provide scalable smart-contract execution but remain unsuitable for regulated financial applications due to three structural gaps: semantic legitimacy, cross-layer state consistency, and ordering fairness. We introduce RegGuard, a unified framework that enhances optimistic rollups with comprehensive legitimacy guarantees. RegGuard integrates three coordinated mechanisms: a decidable semantic validator powered by the RegSpec rule language for encoding regulatory constraints; a cross-layer state pre-synchronization validator that detects inconsistent L1-L2 dependencies with probabilistic reliability bounds; and a cryptographically verifiable fair-ordering service that ensures transaction sequencing fairness with negligible violation probability. We implement a 15,000-line prototype integrated into an Optimism-based rollup and evaluate it under adversarial conditions. RegGuard reduces settlement failures by over 90%, prevents detectable ordering manipulation, and maintains 85% of baseline throughput.

翻译：乐观汇总提供了可扩展的智能合约执行能力，但因三大结构性缺陷而仍不适用于受监管的金融应用：语义合法性、跨层状态一致性以及排序公平性。我们提出RegGuard——一个统一框架，通过全面的合法性保障增强乐观汇总。RegGuard集成三种协同机制：由RegSpec规则语言驱动的可判定语义验证器（用于编码监管约束）、具备概率可靠性边界的跨层状态预同步验证器（用于检测不一致的L1-L2依赖关系），以及一个密码学可验证的公平排序服务（确保交易排序公平性且违规概率可忽略不计）。我们实现了一个集成到基于Optimism的汇总中的15000行原型系统，并在对抗性条件下进行评测。RegGuard将结算失败率降低90%以上，可防止可检测的排序操纵，并维持基线吞吐量的85%。