On Chain Transaction Reordering

Action

On chain transaction reordering represents a deviation from the first-in-first-out (FIFO) principle typically assumed in blockchain transaction processing. This capability, enabled by protocols like MEV-Boost in Ethereum, allows validators or searchers to strategically rearrange transactions within a block to maximize their own rewards. Consequently, the order in which transactions are included can differ from the order they were initially submitted to the mempool, impacting execution costs and potential arbitrage opportunities. This introduces a layer of complexity for derivative strategies reliant on predictable execution timing.