mev-(miner-extractable-value)
MEV, or Miner Extractable Value, represents the profit a miner can make by manipulating the order of transactions in a block.
MEV arises from the ability of miners (or validators in Proof-of-Stake systems) to reorder, insert, or censor transactions within a block. This allows them to extract value from opportunities like arbitrage, front-running, and sandwich attacks. The value extracted is the difference between the price at which a miner buys an asset and the price at which they sell it, or the profit gained by exploiting information asymmetry. MEV is a significant concern in the blockchain space, as it can lead to network congestion, increased transaction fees, and unfair advantages for those with the resources to exploit it.
graph LR
Center["mev-(miner-extractable-value)"]:::main
Pre_cryptography["cryptography"]:::pre --> Center
click Pre_cryptography "/terms/cryptography"
Rel_front_running["front-running"]:::related -.-> Center
click Rel_front_running "/terms/front-running"
Rel_mev_extraction["mev-extraction"]:::related -.-> Center
click Rel_mev_extraction "/terms/mev-extraction"
Rel_mev["mev"]:::related -.-> Center
click Rel_mev "/terms/mev"
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🧒 Explain Like I'm 5
[MEV](/en/terms/mev) for miners was like a cashier who could decide the order of customers checking out, letting themselves go first if they saw someone about to pay with a rare collectible.
🤓 Expert Deep Dive
The concept of Miner Extractable Value emerged prominently with the growth of decentralized finance (DeFi) on platforms like Ethereum, where on-chain activities created significant economic opportunities exploitable through [transaction ordering](/en/terms/transaction-ordering). Miners, by controlling block composition, could capture value from arbitrage, liquidations, and other DeFi-native strategies. This power was often exercised through private channels or by observing the public mempool. The 'selfish mining' strategy is related, aiming to maximize block rewards by withholding discovered blocks, but MEV focuses on extracting value within a block. The transition to Proof-of-Stake (PoS) has shifted this power from miners to validators and block builders, leading to the broader term Maximal Extractable Value (MEV), but the fundamental principle of extracting value via block production control remains.