fraud proof

Challengers can submit a fraud proof within the 7-day window to dispute invalid transactions.挑战者可以在 7 天的窗口期内提交欺诈证明，以对无效交易提出异议。

The security of optimistic rollups depends on at least one honest party being willing to submit fraud proofs.乐观 Rollup 的安全性取决于至少有一方诚实的参与者愿意提交欺诈证明。