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title: EPF Cohort 4 - Week 9 Updates
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Hey there, I am Manav Darji and these are my updates for week 9 (11/09 - 17/09). The goal of this week was to explore and review the fork-choice section of ePBS in the CL spec.

Updates

- Fork choice
- One of the most crucial change in CL will be fork-choice as it's difficult to think of edge cases.
- Potuz and Terrence updated the spec with fork-choice modifications required for the PTC design.
- Had a quick explainer session for the same during weekly catchup.
- Went through some resources to understand current fork-choice and types of reorgs.
- Prepared a few questions to ask mentors for the next call.

- Geth PoC
- Completed the IL verification engine API implementation.

Next steps
- Continue implementing other engine API in geth.
- Reviewing and undersatanding fork-choice changes.

[Back](https://hackmd.io/@manav2401/epf-project-updates)