First, what are rollups? Rollups improve blockchain scalability by executing transactions on separate blockchains.

Arbitrum & Optimism were the first traditional rollups to come to market. They're both known as "optimistic rollups."

What are Optimistic Rollups?

Optimistic rollups are a Layer 2 (L2) construction that improves throughput and latency on Ethereum’s base layer by moving computation and data storage off-chain.

Optimism uses single-round fraud proofs executed on-chain, whereas Arbitrum uses multi-round fraud proofs executed off-chain. What are Optimistic Rollups?

Optimistic rollups are a Layer 2 (L2) construction that improves throughput and latency on Ethereum’s base layer by moving computation and data storage off-chain.

Optimism uses single-round fraud proofs executed on-chain, whereas Arbitrum uses multi-round fraud proofs executed off-chain.

A Beginner's Guide to Optimism

Optimism is a fast, stable, and scalable L2 blockchain built by Ethereum developers, for Ethereum developers. With its focus on public goods, Optimism is an ideal place to start if you're interested in governance.