Agenda
- Development updates
- Spec updates
- Testing updates
- and more
Meeting Time: Tuesday, September 29, 2026 at 13:00 UTC (60 minutes)
Meeting Summary:
The meeting focused on updates for the upcoming launch of fossil-dev-net-zero. Iván reported that his team had updated their branch with the latest spec tests and was working on passing the remaining three tests. NC shared that Lowestar had rebased their branch and passed the gos-sip validation spec tests. Mehdi updated that Teku had fixed issues and was preparing a new Docker image. Marc from Nethermine and Cristian from Lighthouse both stated their clients were close to being ready, with Lighthouse still working on some verification issues. Fabio from Bessel confirmed readiness for DevNet. The group discussed the Beacon API specs, noting that most clients had implemented them but needed to check for missing event streams. Iván mentioned that the FOCIL class frames specs were nearly complete. The conversation also touched on the potential inclusion of CFI features like EIP 8015 and 8365 in future DevNet cycles, with a consensus to wait until after DevNet Zero. The conversation ended with plans to discuss the interaction between fossil and frames in more detail at the next breakout.
Click to expand detailed summary
The team gathered for Fossil Breakout 43 to discuss updates related to the upcoming fossil-dev-net-zero launch. Participants, including Justin, Jihoon, Iván, Mehdi, and Cristian, joined the meeting, with Jihoon mentioning preparation for reviewing bug bounty submissions and EIP matters. No specific decisions or action items were outlined in the transcript, as the meeting appeared to be just beginning with introductions and informal updates.
The team provided updates on their respective projects. Iván reported that the branch updates and spec tests were completed, with three failing tests in Hive that he is working to resolve. Joseph confirmed that the POSO branch was rebased on beta.2 release and all gos-sip validation spec tests are passing. Mehdi fixed two issues raised by VandaOps and discovered another, with plans to publish a new Docker image for DevNet Zero after the call. Marc reported Nethermine is ready for DevNet with only small fixes needed, while Cristian indicated Lighthouse is close to having a DevNet Zero-ready branch, though still working on gos-sip verification and NewPayloadV6 request.
The team discussed the readiness of DevNet Zero for Lighthouse, with Fabio indicating that while some tests are failing, they should proceed. Cristian agreed to share when DevNet Zero is ready for Lighthouse. The group also reviewed updates on Breakout APIs, where NC reported that the hazy Beacon API spec should be postponed until Amsterdam’s Beacon APIs are fully merged, and noted an oversight in including list bits in the payload attributes event stream. Mehdi and Cristian confirmed that Teku and Lighthouse have implemented most Breakout APIs, though specific event stream implementations still need verification.
The team discussed progress on FOCIL class frames specs, which are nearly complete and will be presented at the upcoming FRAMES breakout next week. They also addressed the Beacon API PR with endpoints, noting the need for more feedback from client teams before merging. The group considered presenting changes to the CL side regarding the index-based mechanism in the next FOCIL breakout, and discussed the potential inclusion of simple CFI features in the Hazy specs for the devnet cycle, referencing EIP-8015 and EIP-8365.
The team discussed timing for including new features in DevNet, with agreement to wait for the outcome of DevNet Zero before making decisions. Justin advocated for including new features in DevNet 1 or 2 if possible, while Jihoon noted they could open PRs for CFI features like 8015 and 80365 based on DevNet Zero results. The group also briefly discussed Barnabas’s efforts to launch DevNet for shorter slots, though this was noted to not be CFI’d yet, and they agreed to focus on launching DevNet Zero first before discussing further changes.
Next Steps:
- Iván: Fix the three failing tests on Hive and ensure they pass within a couple of hours.
- Mehdi: Publish a new Docker image for DevNet Zero after the call.
- Cristian: Share the Lighthouse DevNet ZeroReady branch in the chat once it’s ready.
- Iván: Finalize the FOCIL class frames specs by tomorrow or later this week and present them in the FRAMES breakout next week.
- Jihoon or Iván: Prepare a presentation for the next Fossil Breakout on the changes to the CL side to support the interaction between Fossil and FRAMES.
- Jihoon: Open PRs adding CFI features (EIP 8015, 80365) based on the result of DevNet Zero, to decide inclusion in DevNet 1 or 2.
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YouTube recording available: https://youtu.be/0tocJVibSE8