1/ Today, Ethereum's PBS market is limited by structural gaps. The Blockspace Forum exists to address them. This post (links to follow) presents an initial design of Multi-Party Block Construction (MPBC), which builds on a year of workshops and conversations across Ethereum.
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2/ MPBC fundamentally shifts how transactions find blocks & blocks are constructed. We find: - Multiple parties contribute to a block - Better matching of blockspace supply & demand - Increase block utilization & value - Transactions have multiple paths to land in a block
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3/ MPBC starts to address structural gaps in Ethereum’s transaction pipeline identified at the Buenos Aires Blockspace Forum. These fall into the categories of economics, robustness, censorship resistance, performance, and services.
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4/ MPBC benefits Ethereum and its stakeholders in the transaction pipeline through additional and more predictable blockspace utilization.

May 27, 2026 · 12:00 PM UTC

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5/ The design is a first step towards MPBC. Open questions and gaps include value distribution, trust minimization, and technical improvements. We look forward to continuing to address these with the community, and the many teams that have already contributed.
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6/ The full document is on our website and Ethresearch. Special thanks to @jasnoodle, @gd_gattaca, @soispoke, @barnabemonnot, @drakefjustin, @QuasarBuilder, @0xKuDeTa, and @0xseiryu for their comments and review.
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Please see the following links to learn more and read the details. Website: blockspace.forum/research/to… Ethresearch: ethresear.ch/t/building-towa…

Towards Multi-Party Block Construction — Blockspace Forum

Moving from one monolithic builder per block to multi-party blocks assembled from the contributions of multiple builders, widening blockspace allocation to their shared view.

blockspace.forum
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