Rook (formerly known as KeeperDAO) is a cryptocurrency project that operates on the Ethereum blockchain, aiming to optimise the execution of transactions and trades by capturing on-chain arbitrage opportunities. Originating in 2020, Rook is designed to mitigate the inefficiencies caused by transaction ordering, commonly referred to as Miner Extractable Value (MEV). By creating a cooperative ecosystem between liquidity providers, traders, and solvers, Rook seeks to maximise profits for all participants while preventing losses due to front-running and other predatory activities. The Rook token serves as the governance token, empowering the community to vote on proposals and updates to the protocol, thereby fostering a decentralised decision-making process.