The text discusses the challenges of transaction ordering in decentralized finance (DeFi) on the Ethereum blockchain, highlighting the issues of increased gas fees and frontrunning, where some entities exploit their ability to prioritize transactions for profit. It introduces the concept of Miner Extractable Value (MEV), which refers to the potential profit miners can gain by manipulating transaction sequences, and emphasizes that this is an issue not only for miners but for any users capable of exploiting the system. The text proposes a solution called the Fair Sequencing Service (FSS) by Chainlink Labs, which aims to ensure fair transaction ordering using a decentralized oracle network. FSS is designed to separate the ability to extract MEV from mining power, thus reducing centralization and promoting fairness without altering the underlying blockchain. The text highlights that although current solutions like rollups offer scalability and privacy, they do not solve the MEV problem, and FSS seeks to address this by implementing a fair sequencing mechanism that could significantly improve the transparency and fairness of DeFi systems.