# Week 1 Dev Update

## More FOCIL

I started the week by waking up early to join the FOCIL Breakout meeting. The meeting was pretty uneventful, mostly a recap of the Berlin interop and some general discussion. The spec is getting finalized, so moving forward, implementation should be a little more straightforward. There was some discussion about switching from a byte limit on the IL to a gas limit.

I also did a research spike on the relevant Engine API methods that will need to be added or updated for FOCIL. On top of that, I reviewed both the Geth and Reth implementations to more concretely cement the ideas and concepts in my head.

Overall, the week was pretty uneventful, with most of my time spent reviewing docs and catching up. That said, it was still a productive week, and I feel I now have a solid understanding of the EIP and the steps needed to move forward with implementation.

## Next Week

In the coming week, I will finalize my project and talk to others who have similar goals to see if there’s potential for collaboration. If not, I’ll need to find another project. In that case, my fallback would likely be something Lighthouse cache–related, or, though I still need to look into it. Possibly some Ephemery EIP implementations.

## Resources

- [FOCIL Breakout Summary](https://github.com/ethereum/pm/issues/1576)
- [Engine API](https://ethereum.github.io/execution-apis/docs/reference/engine_newpayloadv4/)
- [Reth impl](https://github.com/jacobkaufmann/reth)
- [ZK FOCIL](https://drive.google.com/file/d/1b_r1Xanh4CzlFBsIM9d7Girmf8e0qeb0/view)