EIP-7732 Breakout Room Call #22, August 29, 2025

[will-corcoran]

UTC Date & Time

August 29, 2025, 14:00 UTC

Agenda

1. Payload Post-State Availability in the EVM (EIP-4788 Implications Post-ePBS): Discuss EVM access to beacon state roots post-ePBS, which introduces separate consensus and execution state transitions. EIP-4788 exposes the parent beacon block root (containing a state_root, pre-payload), enabling proofs of pre-payload states (e.g., validator not slashed) but not post-payload states (e.g., consolidation requests processed in payload). Evaluate options:

   • a. Leave as-is, using state.state_roots for post-payload access (grandparent payload, sufficient for most cases).
   • b. New EIP exposing execution payload envelope root (like EIP-4788, for post-payload proofs).
   • c. Add pre_state_root to beacon block (similar functionality to a).

2. Handling Beacon Block Body Fields Moved to Execution

   • Description: Decide on fields shifted from CL to EL (e.g., blob_kzg_commitments, execution_requests) Options:
     • (a) Remove entirely (changes generalized indices; backward compatibility concerns, but no known breakage;
     • (b) Stub as empty, assert in STF (preserves indices, adds tech debt).
     • If removing, consider dropping unused deposits and eth1data (post-Pectra).

3. PR Reviews and Spec Updates

   • Description: Review open PRs:
     • PR-4525: Rename execution payload header to bid. link
     • PR-4527: Remove inclusion proof/signed header from Gloas data column. link
     • Rebase block access list on Gloas spec (add to ExecutionPayload).
     • Consider ePBS rebase on EIP-7688 for SSZ consistency.

4. Discuss Potential Impact on Builder API: https://hackmd.io/@bchain/BJYoUYjIll

5. Discuss Process and Timing for Advancing Spec: epbs-devnet-0 spec

Call Series

EIP-7732 Breakout Room

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60 minutes

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bi-weekly

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[potuz]

Adding one first issue to the agenda about payload post-state availability in the EVM. The issue is explained in https://discord.com/channels/595666850260713488/874767108809031740/1408101393310416986

[terencechain]

I think it’s worth discussing how to handle beacon block body fields that were moved from consensus to execution (e.g. blob_kzg_commitments, execution_requests). Here are the options I see:

1. Remove those fields. This changes the generalized index, and I’ve heard feedback against this approach. It’s not clear to me whether doing so would break anything in use today such as a hard no
2. Keep the fields but stub them out as empty, and assert them in STF. This preserves the generalized index but feels messy, leaving execution-related data in the CL state as forever tech debt.

Side notes:

• If we go with option 1, I’d like to also push for removing deposits and eth1data from the block body, since they’re no longer used after the Pectra fork.
• There’s also been mention of rebasing ePBS on top of EIP-7688, if time permits, to maintain more consistent SSZ structures.

[github-actions]

⚡ Protocol Call Resources:

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✅ Discourse: Discussion Topic

[bharath-123]

I would love to have a discussion on how the builder API would look like with ePBS: Wrote some thoughts at: https://hackmd.io/@bchain/BJYoUYjIll

[poojaranjan]

YT Stream: https://youtube.com/live/u7fjGmyldB8?feature=share