Adding Fairness to Order: Preventing Front-Running Attacks in BFT Protocols using TEEs

This paper presents Fairy: a modular system that augments any Total Order Broadcast (TOB) protocol with fairness properties, namely input (request) causality and sender obfuscation. With these properties, Fairy helps to prevent front-running attacks where an adversary can interfere with the order of requests depending on request payload and sender identity, allowing for substantial application-lev...