November 15, 2021, 11:21AM EST
• 11 min read

What’s the difference between Optimism and Arbitrum?

Quick Take

  • Optimistic rollups (ORUs) have been shown to greatly improve transaction throughput and reduce fees
  • The two leading ORUs, Arbitrum and Optimism, are very similar, with a few differences in their architecture design
  • The main differences include their architecture, fraud proofing and security risks
  • Being the largest two ORUs in the market, it is likely that other ORUs will eventually adopt their design as a benchmark

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