Hasu and Jon bring on Mike Neuder (Ethereum Foundation) and Chris Hager (Flashbots) to discuss the design philosophy of proposer-builder separation (PBS). They first dive into the past and present implementations of PBS, including MEV-Geth and MEV-Boost on Ethereum. Then they discuss the future of PBS - whether PBS should be enshrined, protocol-enforced proposer commitments (PEPC), PBS on L2s, how to prevent censorship, and more. 
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Timestamps:
(00:00) Intro 
(01:12) What is PBS?
(05:37) The History of PBS
(08:43) MEV-Boost
(10:18) Block Production in Proof-of-Work 
(11:31) Benefits of PBS
(14:17) PBS Makes Based Rollups Viable
(16:21) PEPC & Proposer Complexity
(17:46) Other Builder Services
(19:49) PBS & Regulation
(22:48) Regulation & Encrypted Mempools
(24:38) Division of Labor is Inevitable
(26:15) Risks of PBS
(29:03) Development of COre Protocol Software
(33:31) PEPC, POB, & Alternatives to PBS
(41:53) Decentralization vs. Usefulness Tradeoff
(46:30) State of PBS in MEV-Boost
(50:51) Optimistic Relays
(52:09) Enshrined PBS (ePBS) 
(55:55) PBS on L2
(58:47) PEPC
(01:05:25) Proposer Commitments & User Intents 
(01:09:03) Concluding Remarks
(01:11:05) Recap
(01:12:06) PEPC, PEPC-Boost, & MEV-Boost+
(01:18:44) PBS From First Principles
(01:21:41) PBS is a Philosophy, Not an Implementation
(01:25:44) To Enshrine, Or Not to Enshrine?
(01:35:12) In-protocol vs. Out-of-protocol Development & Funding
(01:50:16) Censorship & Proposer Agency
(01:58:15) Outro & Disclaimer
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Hasu - https://twitter.com/hasufl
Jon Charbonneau - https://twitter.com/jon_charb
Uncommon Core 2.0 - https://twitter.com/UCC2_xyz
Mike Neuder - https://twitter.com/mikeneuder
Chris Hager - https://twitter.com/metachris
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Relays in a post-ePBS world - https://ethresear.ch/t/relays-in-a-post-epbs-world/16278
No free lunch – a new inclusion list design - https://ethresear.ch/t/no-free-lunch-a-new-inclusion-list-design/16389
Payload-timeliness committee (PTC) – an ePBS design - https://ethresear.ch/t/payload-timeliness-committee-ptc-an-epbs-design/16054
Notes on Proposer-Builder Separation (PBS) - https://barnabe.substack.com/p/pbs
PEPC FAQ - https://efdn.notion.site/PEPC-FAQ-0787ba2f77e14efba771ff2d903d67e4#41230925420345af84f31b50d806b8ed
PEPC Open Problems - https://docs.google.com/presentation/d/12kpwAXbZqUA0fu2HnZKSesVwO31ICbgIiacHd0EQ_fk/edit#slide=id.g2401d3821ec_1_0
PBS Guild Proposal [v3 WIP] - https://collective.flashbots.net/t/pbs-guild-proposal-v3-wip/2223
MEV-Boost+/++ - https://www.blog.eigenlayer.xyz/censorship-resistance-with-restaking/
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