Who assembles Ethereum's blocks—do validators line up themselves?
MEV-Boost is open-source middleware launched by Flashbots. It came into use around Ethereum's “Merge,” allowing validators to obtain entire blocks of transactions from external builders.
Proposer-Builder Separation (PBS) means assigning “assembling transactions into a block” and “proposing and signing the block” to two different types of participants.
The most important thing to remember when managing positions: if you run a validator yourself, find out who operates the relays you connect to and what filtering rules they use—don't focus only on the bids.
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