Rollup Protocol Overview | Optimism Docs

The big idea that makes Optimism possible is the Optimistic Rollup. We'll go through a brief explainer of how Optimistic Rollups work at a high level. Then we'll explain why Optimism is built as an Optimistic Rollup and why we believe it's the best option for a system that addresses all of our design goals. Check out the protocol specs (opens in a new tab) , if you want to more detail about the rollup protocol. Optimism is an "Optimistic Rollup," which is basically just a fancy way of describing a blockchain that piggy-backs off of the security of another "parent" blockchain. Specifically, Optimistic Rollups leverage the consensus mechanism (like PoW or PoS) of their parent chain instead of providing their own. In OP Mainnet's case, this parent blockchain is Ethereum. In Bedrock, L2 blocks are saved to the Ethereum blockchain using a non-contract address (0xff00..0010 on Ethereum (opens in a new tab) ) to minimize the L1 gas expense. As these blocks are submitted as transactions using

The big idea that makes Optimism possible is the Optimistic Rollup. We'll go through a brief explainer of how Optimistic Rollups work at a high level. Then we'll explain why Optimism is built as an Optimistic Rollup and why we believe it's the best option for a system that addresses all of our design goals. Check out the protocol specs (opens in a new tab) , if you want to more detail about the rollup protocol. Optimism is an "Optimistic Rollup," which is basically just a fancy way of describing a blockchain that piggy-backs off of the security of another "parent" blockchain. Specifically, Opt