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Optimistic Rollups

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Optimism

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Optimism is a Public Benefit Corporation (PBC) that built Optimistic Ethereum (OE) which is an optimistic rollup L2 on Ethereum.

Similarities between Optimism and Arbitrum:

are rollups and store all txs on L1
are optimistic since they use fraud proofs
use sequencers for instant 'finality'
have generic cross-chain messaging allowing the creation of advanced token bridges
support EVM-related tooling, but need specialized extensions

Differences:

different fraud proof verification mechanism
Optimism OVM 2.0 is EVM equivalent vs. Arbitrum One (post-Nitro) EVM-compatible
Optimism uses single round fraud proofs vs. Arbitrum multi-round FPs
Optimism is still gated (private whitelist mainnet for previous applicants) vs. Arbitrum public mainnet (permissionless)

Lets dig deeper through contract.

Comments from Enzo

51% attack in Optimistic Rollups can result in theft of funds, whereas in ZK-Rollup it could only allow for the reverting of transactions.

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