Maximal Extractable Value (MEV) — formerly Miner Extractable Value — refers to the profit that block producers (miners in PoW, validators in PoS) can extract from users by controlling the ordering of transactions within a block. MEV represents a hidden tax on blockchain users and has become one of the most analysed and debated aspects of DeFi economics.
HOW MEV ARISES
Every pending blockchain transaction sits in the public mempool awaiting inclusion in a block. Whoever produces the next block (miner or validator) can: include transactions in any order, exclude specific transactions entirely, and insert their own transactions anywhere in the sequence. This ordering power creates opportunities to profit at users' expense.
COMMON MEV EXTRACTION STRATEGIES
Sandwich Attacks: The most common form targeting DEX swaps. MEV bot detects a large DEX swap in the mempool. Bot front-runs the victim: submits a buy order with higher gas to execute just before the victim's swap — pushing the price up. Victim's swap executes at the artificially elevated price. Bot back-runs: sells immediately after the victim's swap — profiting from the price movement it created. The victim receives fewer tokens than expected.
Arbitrage: MEV bots detect price differences between DEXs and execute profitable arbitrage. This is generally considered beneficial MEV — it improves market efficiency and doesn't harm users.
Liquidation Racing: When a DeFi loan becomes undercollateralised, a liquidation becomes profitable. MEV bots race to be the first to execute the liquidation and claim the bonus.
THE FLASHBOTS RESPONSE
Flashbots is a research organisation that built MEV-Boost — infrastructure allowing validators to receive MEV-optimised blocks from specialised "block builders." MEV-Boost has captured most Ethereum block production, creating a transparent marketplace for MEV rather than chaotic mempool warfare. Flashbots Protect RPC allows users to submit transactions privately — hidden from public MEV bots. Over 90% of Ethereum validators use MEV-Boost.
Terms in addition to the MEV (Maximal Extractable Value)
A blockchain is a subset of a distributed database. The Bitcoin inventors originally prototyped the system in 2008. This modern database is made up of separate blocks that are connected together in a chronological chain. Blockchains may be used to store a wide range of data types. It has mostly been utilized as a public ledger for bitcoin transactions to date. A peer-to-peer network comprised of independent nodes uses a consensus process to ensure the blockchain's security and legitimacy. Each node in the network keeps a public and immutable copy of the data.
2 Factor Authentication is a security measure with two layers. It is used by the majority of cryptocurrency exchanges. To log in, you must provide not only a password, but also a code obtained, for example, from the Google authenticator.
An airdrop is a method of distributing coins. End users can typically obtain coins for free or in exchange for doing a small task, such as subscribing to a newsletter, sending a tweet, or inviting others via a personal affiliate link. Cryptocurrency airdrops — the act of depositing cryptocurrency into public crypto wallets — are utilized as a marketing, liquidity creation, and network bootstrapping technique for many different types of blockchain initiatives.
Altcoin - "alternative coin" - is any kind of digital currency other than Bitcoin. Since the launch of Bitcoin, the world's first digital currency, many altcoins (as well as supporting blockchains) have been created. Altcoin digital currencies share many similarities to Bitcoin, but consistently and have significant differences. There are about 20,000 altcoins, and this number is expected to grow significantly in the coming years. Altcoins often develop Bitcoin features. Ethereum, currently the most widely used blockchain, supports digital contracts and separate applications where Bitcoin does not. Altcoins are also often created to cater to the needs of different users. The Litecoin blockchain, for example, can process payments quarterly for the duration of Bitcoin.
Cold storage is the way to store cryptocurrency offline. The word refers to the use of offline wallets that are not connected to the internet. Cold storage is the most secure way to keep cryptocurrencies since an offline currency becomes less likely to be hacked and stolen. Paper wallets, printed renditions of private keys, and offline hardware and software wallets are all examples of cold storage.
