Short Paper: Unpredictable Transaction Arrangement for MEV Mitigation in Ethereum

We present a simple approach to mitigate transaction-ordering dependent Maximum-Extractable-Value (MEV) opportunities in Ethereum. The approach is built on top of Proposer-Builder-Separation, restricts the freedom to order transactions within a block arbitrarily, and relies primarily on a non-malleable signature scheme and separation of responsibilities. In addition, we generalize the proposed approach to show that the property of unpredictable transaction arrangement can be transferred also to other blockchain systems. We discuss the gain in MEV mitigation, important limitations, and open issues.