What Is Proposer-Builder Separation (PBS) in Ethereum's PoS? ▴ Learn

What Is Proposer-Builder Separation (PBS) in Ethereum’s PoS?

Proposer-Builder Separation (PBS) is an architectural change in Ethereum's Proof-of-Stake that separates the roles of creating a block (the "builder") and proposing a block to the network (the "proposer," who is the validator). The builder is responsible for ordering and optimizing transactions for MEV, while the proposer selects the most profitable block header offered by a builder.

This separation aims to limit the validator's direct control over transaction ordering, thus decentralizing MEV extraction and mitigating validator-based front-running.

What Is a ‘Builder’ and a ‘Proposer’ in the Context of MEV and Transaction Ordering?

What Is the Role of a ‘Relayer’ in the MEV Supply Chain?

How Does the “Proposer-Builder Separation” (PBS) Model Enhance Security?

What Is the Difference between a Block Proposer and a Block Builder in Ethereum’s PoS?