Optimism (OP) is a layer 2 scaling solution for Ethereum. The platform aims to enable low-cost and near-instant Ethereum transactions. The special sauce to Optimism’s scaling methodology is in its name. It uses a technique called "optimistic rollups", whereby multiple transactions are ‘rolled up’ into one transaction, settled on another blockchain, with receipts fed back to the main Ethereum network. You can safely and reliably buy and sell “OP” at LiteBit.