EIP-4844 Blob Expiry and Data Availability Gaps
Blob data prunes after ~18 days. For fraud provers running multi-round disputes, that window is tighter than it looks, and the archiver gap is real.
№ 002EthereumHow Optimistic Rollups Detect Fraud On-Chain
Optimistic rollups skip verifying every transaction. Here's the exact mechanism that catches cheaters anyway, with a worked example.