For the most up-to-date information, please see: <a href="https://eco.com/support/en/articles/10080375-what-is-a-rollup-optimistic-vs-zk-rollups"><b>What Is a Rollup? Optimistic vs ZK Rollups</b></a>

What is an optimistic rollup? A 2026 guide to Ethereum L2 scaling, fraud proofs, challenge windows, Arbitrum vs Optimism, and how optimistic rollups compare to ZK rollups.

What Is an Optimistic Rollup? A 2026 Layer 2 Guide

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What Is an Optimistic Rollup? A 2026 Layer 2 Guide

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