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+---
+id: Optimism-doc
+title: Optimism
+sidebar_label: Optimism
+---
+
+### Description
+Optimistic Rollups (ORs) are one type of layer 2 constructions that do not run on Ethereum's base layer but on top of it. 
+This enables running smart contracts at scale while still being secured by Ethereum. These constructions resemble Plasma,
+but trade the almost infinite scalability of Plasma to run an EVM compatible Virtual Machine called OVM (Optimistic Virtual Machine)
+which enables ORs to run anything Ethereum can.
+
+### Finality Time
+
+Optimism block production is primarily managed by a single party, called the "sequencer," which helps the network by providing the following services:
+
+1. Providing instant transaction confirmations and state updates.
+2. Constructing and executing L2 blocks.
+3. Submitting user transactions to L1.
+
+The sequencer has no mempool and transactions are immediately accepted or rejected in the order they were received. 
+When a user sends their transaction to the sequencer, the sequencer checks that the transaction is valid (i.e. pays a sufficient fee) and then applies the transaction to its local state as a pending block. 
+These pending blocks are periodically submitted in large batches to Ethereum for finalization. This batching process significantly reduces overall transaction fees by spreading fixed costs over all of the 
+transactions within a given batch. The sequencer also applies some basic compression techniques to minimize the amount of data published to Ethereum.
+
+
+### Theoretical Max Transactions Per Second
+2000 tps
+
+### Measured Max Transactions Per Second
+200 tps
+
+
+### Consensus Mechanism
+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 take advantage of the consensus mechanism (like PoW or PoS) of their parent chain instead of providing their own.
+In Optimism's case this parent blockchain is Ethereum.
+
+
+### Transactional Token
+- What token is used to pay for gas on the chain?
+Ether for the initial Optmism mainnet chains, although in principle a chain could be created with any ERC20 asset as the native token.
+
+
+### Links
+[Ethhub](https://docs.ethhub.io/ethereum-roadmap/layer-2-scaling/optimistic_rollups/) <br />
+[Optimism](https://community.optimism.io/docs/how-optimism-works/#rollup-protocol)