BlockchainAdvanced#Ethereum#MEV
Proposer-Builder Separation (PBS)
P
Definition
A block-production design that separates building an execution payload from proposing a consensus block. Implementations can use external relays or protocol rules, with different trust and censorship properties.
Source reviewed
- ethereum.org: MEV and PBS opens in a new tab
Supports: ethereum.org describes PBS roles, temporary external builder APIs, relays, and the higher trust assumptions of current working implementations.
- ethereum.org: PBS presentation opens in a new tab
Supports: Ethereum Foundation material explains how MEV-Boost relays mediate builder-proposer exchange and the ongoing effort to reduce trust dependencies and improve censorship resistance.
Concept Diagram
Key Takeaways
1
PBS separates execution-payload construction from consensus proposal duties
2
Current external PBS paths can involve relays and off-protocol trust assumptions
3
PBS may mitigate some MEV pressure but does not guarantee censorship resistance or decentralization
4
Check the deployed client, relay, inclusion, validation, and availability policy
Practical Example
A validator operator documents whether it builds locally or uses MEV-Boost, which relays it trusts, how payloads are validated, and its censorship and fallback policy. A higher bid is treated as one input, not proof that the payload path is safer, more decentralized, or appropriate for every validator.
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Related Terms
Blockchain
MEV (Maximal Extractable Value)Value that block-production participants or other transaction-ordering actors can obtain beyond standard rewards and fees by including, excluding, or ordering transactions. Its effects depend on the chain, market design, and exact strategy; it is not a single user fee or a guaranteed bot profit.
Blockchain
SequencerA node in a Rollup (L2) responsible for ordering transactions before they are batched and sent to the L1 (Ethereum).
Blockchain
FinalityA protocol-defined state in which reversing a block requires violating that network's consensus assumptions and incurring its specified cost. It differs from a wallet confirmation, sequencer response, or settlement on another chain.
Blockchain
Base Layer (Layer 1)A blockchain's own consensus and settlement layer. The label describes where that protocol processes and orders transactions; security, finality, data availability, and scaling guarantees differ by chain and design.
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