# EPF Week 5 This week marked a return to hands-on development after last week's coordination-focused efforts. Significant progress was made on both the **FOCIL** and **Pureth** fronts, including implementation work, technical investigations. ## FOCIL Updates Continued **FOCIL (EIP-7805)** in the **Nimbus CL** codebase. ### Technical Work: * I set up the **IL committee logic** using the existing beacon state and spec primitives. * Defined the preliminary structure for **inclusion lists (ILs) Store **,and started implementing the parts affected by honest validator changes from the spec. ### Collaboration: * Continued close coordination with **ZKash**. He’s progressing on the **fork-choice modifications**, ## Pureth Updates ### Development Progress * Began working on the **SSZ Execution Block Test Vectors** In [Execution Spec tests](https://github.com/ethereum/execution-spec-tests), in accordance with [EIP-6404](https://eips.ethereum.org/EIPS/eip-6404),[EIP-6466](https://eips.ethereum.org/EIPS/eip-6466),[EIP-6465](https://eips.ethereum.org/EIPS/eip-6465) and [EIP-7807](https://eips.ethereum.org/EIPS/eip-7807). * Worked with **Vineet** to assess the time frame and efforts of 2D log index integration ([EIP-7745](https://eips.ethereum.org/EIPS/eip-7745)) within Nimbus’s EL structure. * Began initial scoping for the EIP-7807 Inside the Nimbus EL. * Maybe need to set up something for hive and kurtosis for this project as execution spec test inside kutosis how -? ### Coordination * Etan will also be working to get the python impl of the progressive list and progressive container in the python lin remerkleable so that It can be used in * Held initial discussions with **Advaita** (Nimbus EL) to scope out the EL integration timeline and clarify interface boundaries between EL and CL. ## Upcoming Goals **Next week (Week 6)** will focus on: * Completing the inclusion list store and honest validator implemenatation in FOCIL. * Finalizing testing the SSZ execution payload schema in a local fork of Nimbus-EL. * Writing initial test cases to validate log extraction and SSZ encoding compliance for new receipt structures.