Short for “Miner Extracted Value” or “Maximal Extracted Value”, MEV is value above and beyond block rewards and transaction fees which can be collected by miners and validators of both proof-of work and proof-of-stake blockchains. For example, someone may pay a miner directly to include their transaction in a Bitcoin block, or an arbitrage bot might pay to front-run a transaction just before a DEX swap on Ethereum.
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