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July 24, 2025, 6:00pm
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#161 summaryACDC #161 Action Items
fusaka-devnet-3 is live! Continue monitoring (and debugging issues as they arise) to progress towards mainnet.The following EIPs have been CFI’d for Glamsterdam to signal potential CL headliners
EIP-7732 (ePBS)
EIP-7782 (Six second slots)
EIP-7805 (FOCIL)
Outcome of next ACDE and the prior list will be used to make a final call on the CL headliner on the next ACDC on 7 August.
Community input: please add here Soliciting stakeholder feedback on Glamsterdam headliners if you’d like to signal support for or against one of the above headliner candidates.
ACDC #161 Summary
fusaka-devnet-2
Running various test scenarios, some syncing issues in clients
fusaka-devnet-3
Launched ~24 hours ago, will fork to Fusaka soon
Looks good from initial assessement
Working on MEV workflow implementation
Implementing rate limiters on full nodes:
100 Mbps down / 50 Mbps up on 70% of full nodes
30% super nodes with potentially 1 Gbps limit (from 10 Gbps)
Previous devnets had no rate limiting
Proposal for timelines
August for hardening work
Release candidates by end of August
Target mainnet launch before DevConnect
Process requires 30 days between testnet fork and mainnet date
Timeline considered ambitious but not impossible
Glamsterdam
Series of updates to inform headliner conversation:
Shorter Slot Times Research Update
Maria presented preliminary results on slot timings:
Metrics measured:
Block propagation (excluding timing games)
Attestation arrival time (including block propagation, execution, validation)
Pure attestation propagation for missed slots
Data shows:
Block propagation 95th percentile under 1 second for well-connected nodes
Full attestation processing 95th percentile of 95th percentile below 4.5 seconds
Identified shift in distribution around 1.5s mark where last 10% take longer
Next research steps:
Collect more data from other relays
Analyze blobs and aggregates
Investigate locally built blocks and small blocks
Research late arrivals to understand contributing factors
Update on ePBS Free Option Problem
Christoph and Bruno from Flashbots presented:
Problem: Winning builders can invalidate blocks if unhappy with market changes
8-second window gives builders option to fail to send blobs
Option value increases with:
Market volatility
On-chain liquidity
Time window length
Potential solutions:
Shorten free option window
Implement slashing penalties
“Block-listing” (not preferred as reduces permissionlessness)
Separate blobs from transactions with independent fee market
Needs further analysis around mitigations and impact
Another ePBS update
Community input
Highlighted community input from Christine Kim
Headliner selection
Given that, we discussed how to proceed.
Decided to CFI three EIPs with the understanding that we would select one as a headliner:
EIP-7732 (ePBS)
EIP-7782 (Six second slots)
EIP-7805 (FOCIL)
This helps narrow scope for next ACDE so a headliner decison can be made there
Given this and results of next ACDE, a decision will be made for the CL headliner on the next ACDC
One important point of the discussion was how to best capture community input to help guide headliner selection. If you’d like to make a case for one of the above as headliner, please add it here: Soliciting stakeholder feedback on Glamsterdam headliners
Spec Question: SSZ Types for Pureth
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