What Is the Difference between a Block Proposer and a Block Builder in Ethereum’s PoS?
In Ethereum's Proposer-Builder Separation (PBS) model, the "block proposer" is the validator randomly selected to propose the next block, earning the priority fee. The "block builder" is a specialized entity that receives transaction bundles from searchers, constructs the optimal, most profitable block payload, and submits it to the proposer.
The proposer then signs the block header from the builder, separating the block construction logic from the proposer's role.
Glossar
Proposer-Builder Separation (PBS)
Mechanism ⎊ Proposer-Builder Separation (PBS) represents a critical architectural refinement within blockchain systems, specifically designed to decouple the roles of proposing new blocks from the execution of those blocks, enhancing scalability and mitigating risks associated with Maximal Extractable Value (MEV).
Block Proposer
Selection ⎊ Block Proposer functionality within a Proof-of-Stake consensus mechanism represents a critical node responsible for curating the next block of transactions, directly influencing network throughput and security.
Block Construction Logic
Structure ⎊ The precise set of rules and algorithms governing how transactions are selected, ordered, and bundled into a valid block structure by a validator or miner.
Proposer
Role ⎊ A proposer in a Proof-of-Stake blockchain is a validator node selected to create and broadcast the next block to the network.
Transaction Bundles
Transaction ⎊ Within cryptocurrency, options trading, and financial derivatives, a transaction bundle represents a pre-defined, aggregated set of related financial instruments executed as a single, atomic operation.
Block Builder
Architecture ⎊ Block Builder, within cryptocurrency and financial derivatives, represents a foundational layer for constructing complex trading strategies and decentralized applications.