# What are blockchain rollups?

**Published by:** [Wolverineneper](https://paragraph.com/@wolverineneper/)
**Published on:** 2023-07-20
**URL:** https://paragraph.com/@wolverineneper/what-are-blockchain-rollups

## Content

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.

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