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Intro
Maximal Extractable Value (MEV) is a concept that has evolved significantly with Ethereum's shift from a proof-of-work (PoW) to a proof-of-stake (PoS) system, reflecting the changing dynamics of transaction handling and block validation. Originally termed as "miner extractable value" in the PoW context, MEV represented the potential profit miners could gain by manipulating the inclusion, exclusion, and order of transactions. However, with the advent of Ethereum's transition to PoS known as "The Merge," this responsibility shifted to validators, prompting a broader application of the term MEV.
MEV emerges from the unique structure and function of blockchain. Unlike a simple first-come, first-served system, blockchains operate more like competitive marketplaces. Those responsible for adding new transactions to the blockchain, such as miners or validators, prioritize transactions that offer them the highest fees. This auction-like system is the playground of MEV, where block producers strategically choose transactions to maximize their returns.
Source: BlockNative
This phenomenon is influenced by several factors: the limitation of block space, the transparency of transactions, the existence of transaction fees, and the authority of block producers over transaction sequencing. These elements create opportunities for block producers to significantly influence the order and inclusion of transactions, thereby extracting maximum value.
In practice, MEV accrues primarily to validators as they control transaction ordering, but a notable portion is also captured by "searchers." These independent actors deploy algorithms to identify profitable transaction sequences and submit these to the network. Their success hinges on paying substantial gas fees to validators to prioritize their transactions, particularly for competitive opportunities like decentralized exchange (DEX) arbitrage, often resulting in a significant portion of their MEV revenue being expended.
MEV is a double-edged sword with both beneficial and detrimental effects. Positively, it encourages actors to correct market inefficiencies, thus supporting the stability and accuracy of DeFi protocols. However, it has negative ramifications at both the application and network levels, from worsening user experience through practices like sandwich attacks to causing network congestion and even potential blockchain reorganizations if the MEV outweighs standard block rewards.
Source: Xangle
The Ethereum community has taken note of the escalating MEV issues, particularly as they contribute to validator centralization risks and disrupt the decentralized ethos of the network. In response, innovations such as Proposer-Builder Separation (PBS) and the Builder API have been proposed. PBS aims to mitigate the adverse effects of MEV by decoupling the roles of block producers and proposers, creating an auction market for block space, and reducing the incentive for validators to engage in manipulative practices like chain reorganizations.
Proposer-Builder Separation (PBS)
Maximal Extractable Value (MEV) presents a formidable challenge in the Ethereum network, contributing significantly to the centralization of block building and transaction censorship. The core issue stems from Ethereum's permissionless structure, allowing anyone globally with internet access and necessary software to send transactions. This openness, while a cornerstone of blockchain's ethos, paves the way for malicious entities to inundate the network with spam transactions, leading to potential slowdowns and vulnerabilities.
In response to the escalating concerns surrounding MEV, Ethereum's core developers, in collaboration with Flashbots, introduced MEV-Boost. This innovation allows validators to connect to an array of third-party MEV marketplaces—known as relays—to receive pre-constructed blocks imbued with MEV, crafted by specialized entities referred to as "builders."
To review, a block proposer, in the context of Ethereum's current architecture, is a node that gathers transactions into a new block. A builder is the entity that actually gathers transactions and builds the block. This block is then propagated across the network for validation and eventual inclusion in the blockchain. Proposers play a critical role in determining transaction order and inclusion, often prioritizing those that offer higher priority fees from the Ethereum mempool. This practice remains consistent in the design of post-merge Ethereum.
However, with the introduction of the Ethereum Merge and the shift to a Proof-of-Stake (PoS) model, the dynamics of block proposing have evolved. Validators are now randomly selected to act as block proposers in each slot. These validators are responsible for creating and broadcasting new blocks while a randomly selected committee of validators confirms the blocks' validity.
While MEV-Boost represents a stride towards decentralization, it doesn't fully resolve the centralization and censorship issues attributed to the builders and relays themselves. The solution's evolution and the broader Ethereum's Proposer-Builder Separation (PBS) are under active exploration, highlighting the vast potential of this domain.
