Optimistic rollup operators bundle multiple off-chain transactions together in large batches before submitting to Ethereum. Optimistic rollups execute transactions outside of Ethereum, but post transaction data to Mainnet as calldata. What is an optimistic rollup?Īn optimistic rollup is an approach to scaling Ethereum that involves moving computation and state storage off-chain. You should have read and understood our pages on Ethereum scaling and layer 2.
Optimistic rollups also write transactions to Ethereum as calldata, reducing gas costs for users.
Unlike other scaling solutions, such as sidechains, optimistic rollups derive security from Mainnet by publishing transaction results on-chain, or plasma chains, which also verify transactions on Ethereum with fraud proofs, but store transaction data elsewhere.Īs computation is the slow, expensive part of using Ethereum, optimistic rollups can offer up to 10-100x improvements in scalability. They reduce computation on the main Ethereum chain by processing transactions off-chain, offering significant improvements in processing speeds. Optimistic rollups are layer 2 (L2) protocols designed to extend the throughput of Ethereum's base layer.
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