Optimism is a layer-2 blockchain that is built on top of Ethereum. Aiding in scalability, Optimism benefits from Ethereum’s security, resulting in transactions being recorded on Optimism but secured on Ethereum. Optimism aims to have the minimum number of moving parts while building a layer-two solution for Ethereum. In practice, this means using proven Ethereum code and infrastructure when possible. Optimism thus aims to keep its code as simple as possible and work directly with existing codebases. The Optimism roadmap aims to have L1-governed fault proofs ready by 2024.
It’s powered by Optimistic Rollups, which bundle large amounts of transaction data into digestible batches. Optimism is cheaper to use than Ethereum, and it’s increasingly becoming popular along with other layer 2s, such as Arbitrum, another layer 2 which utilizes optimistic rollup.
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