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As Nitro is released, let’s look back at the Arbitrum architecture. Arbitrum is one of the pioneers of Optimistic Rollup. It has a huge influence on successor rollups. In this research piece, we will dive deep into the essential parts of rollups and hopefully find anything similar to new rollups by ourselves.
Arbitrum is an EVM-compatible optimistic rollup. Although it is EVM compatible, there are some differences in variables, like block.number. When getting block.number on Arbitrum, you will get the block number on the Arbitrum network, but not Ethereum.