FOCIL Breakout #31, March 24, 2026

[jihoonsong]

UTC Date & Time

March 24, 2026, 14:00 UTC

Agenda

• Development updates
• Spec updates
• Testing updates
• and more

Call Series

FOCIL Breakout

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Duration

60 minutes

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bi-weekly

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[jihoonsong]

FOCIL stays the course toward Hegotá.

Development Updates

• Besu has a FOCIL PR under review, covering engine APIs implementation and block building. The team is currently prioritizing Glamsterdam optimizations.

• Lodestar has no major updates as CL teams are currently busy with ePBS devnet-0.

Spec Updates

• Jihoon is rebasing all FOCIL specs on top of Hegotá. The EL spec and engine APIs spec have rebased on top of Amsterdam.

• The CL spec is already on top of Heze but there will be more changes regarding deadlines. Firstly, the 8-second deadline will be removed as it is an implementation-dependent example, which Nico pointed out nearly a year ago. Then, a new 12-second deadline will be introduced for attester's view freeze. When an IL committee member equivocates, all attesters should share the same view of that equivocation. If some attesters observe the equivocation before their attestation while others only see it afterward, there will be a split view. This issue was found by Mikhail about 9 months ago.

• The deadline changes are still work in progress and will be revisited after EthCC, followed by an EIP update.

Testing Updates

• On the CL side, testing will initially focus on reference tests and expand to fuzzing, devnets and compliance tests over time.

• On the EL side, with STEEL team, the testing infrastructure in EEST will be updated to support inclusion lists and start from there.

Links

• Besu's FOCIL PR
• EL spec PR (on Amsterdam)
• Engine APIs spec PR (on Amsterdam)
• EL Testing Issue Tracker

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