What is Optimistic Rollup?

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Optimistic Rollups (ORUs) are a Layer 2 (L2) scaling solution for Ethereum that increases transaction throughput and reduces gas fees by processing transactions off-chain and posting batched data back to the mainnet, operating on the assumption that all transactions are valid unless proven otherwise via a fraud-proof mechanism. This "optimistic" approach allows for significantly higher transaction speeds, potentially reaching thousands of transactions per second (TPS), while inheriting the security of the Layer 1 (L1) blockchain.

Optimistic Rollup

What is Optimistic Rollup?

How do Optimistic Rollups achieve significant scaling and cost reduction on Layer 2 networks?

What is the fraud-proof mechanism, and how does it ensure the security of Optimistic Rollups?

What are the key differences between Optimistic Rollups and ZK-Rollups in terms of security and finality?

Which are the leading Optimistic Rollup projects, and how has the Ethereum ecosystem supported their growth?

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