Order Reordering

Mechanism

Order reordering refers to the practice where an intermediary, such as a validator or sequencer in a blockchain, changes the sequence of transactions from the order they were initially submitted. This mechanism can be legitimate for network optimization or malicious for maximal extractable value (MEV) extraction. It directly influences transaction finality and execution price. The ability to reorder creates a significant informational advantage. This practice is prevalent in some decentralized environments.