EPF Dev Update #8

--- tags: epf,ethereum --- # EPF Dev Update #8 My focus this week has been on Lighthouse interop testing in preparation for [EIP-4844 devnet v3](https://notes.ethereum.org/@timbeiko/4844-devnet-3), which was launched a couple of days ago with just one client pair (Prysm/Geth), and we're hoping to to add Lighthouse to the mix very soon (more details in below section). We've achieved a great milestone this week to have Lighthouse integrated into the [eip4844-interop](https://github.com/Inphi/eip4844-interop) repo and have passed both the blob transction tests and fee market tests! Big shoutout to **@Inphi**, [**@realbigsean**](https://github.com/realbigsean) and the Lighthouse team :clap: :fireworks: Areas I worked on this week: - Debug Lighthouse sync issues - Add Lighthouse to eip-4844-interop repo ([eip4844-interop#77](https://github.com/Inphi/eip4844-interop/pull/77)) - Add Beacon API endpoint to download blobs by block id ([lighthouse#3830](https://github.com/sigp/lighthouse/pull/3830)) For next week/year: - Set up a Lighthouse/Geth node on [EIP-4844 devnet-3](https://notes.ethereum.org/@timbeiko/4844-devnet-3) - Beacon API & Builder Spec updates for EIP-4844 - [beacon-APIs#271](https://github.com/ethereum/beacon-APIs/pull/271) - [builder-specs#58](https://github.com/ethereum/builder-specs/pull/58) - I've addressed all review comments by **@0xGabi** and **@ralexstokes**, PRs waiting for review - Implement builder updates in Lighthouse - draft PR from last week here, to be continued: [lighthouse#3808](https://github.com/sigp/lighthouse/pull/3808) ## Debugging Lighthouse Sync issues & interop testing https://github.com/Inphi/eip4844-interop/pull/77 (Merged) PR to add Lighthouse to interop repo was finally merged this morning after a few days of hard work with **@realbigsean** and **@Inphi** \o/ ### Lighthouse Sync issues Earlier in the week I spent quite a bit of time using the [Clion](https://www.jetbrains.com/clion/) Rust debugger to troubleshoot Lighthouse sync issues, and it was quite fun and rewarding! Although I wasn't able to find out what the root cause was, the Lighthouse team did, and fixed the sync issues in [this PR](https://github.com/sigp/lighthouse/pull/3827). I was able to run a [local network](https://github.com/sigp/lighthouse/tree/eip4844/scripts/local_testnet) of 4 Lighthouse/Geth nodes to verify the sync works - by starting 4 nodes, and immediately shutdown one node, then starting that node after 160 slots (to make sure epoch 3, a post merge 4844 epoch is finalized). ### Interop testing After confirming Lighthouse sync works locally, I moved back to the interop testing task I was working earlier, given that Lighthouse was ready for it. The interop repo contains a few important tests for EIP-4844, including a blob tx test, which sends a blob tx to the EL, and download it from mulitple Lighthouse beacon nodes. With @Inphi's help and a couple of fixes, we finally got Lighthouse passing both the blob transaction tests and fee market tests! :rocket: ## Add Beacon API endpoint to download blobs by block id I found it quite challenging to test blobs when I was doing interop testing, as there is no Beacon API available for this. I raised an [issue]( https://github.com/ethereum/beacon-APIs/issues/282) in the [Beacon API](https://github.com/ethereum/beacon-APIs) spec repo, but this hasn't been worked on yet. So I suggested adding an endpoint to the Beacon API under `/lighthouse`, which consists of only non standard endpoints for dev and other purposes. **@realbigsean** agreed that it would be helpful for debugging, so I went ahead and started implementation. I've created a draft PR here, and will start testing this soon: https://github.com/sigp/lighthouse/pull/3830 ## Running a Lighthouse/Geth node on EIP-4844 devnet-3 I haven't been able to a Lighthouse/Geth node working yet, as there are still some known issues that are currently being fixed, but I've dropped some notes on running Lighthouse/Geth combo here (credit goes to **@realbigsean**): https://github.com/jimmygchen/devnet-v3 Hopefully I'll get a node running in the next few days! :star-struck: ## Other small PRs - Various small fixes to 4844 branch ([lighthouse#3825](https://github.com/sigp/lighthouse/pull/3825)): log and comment improvements - Use bootnode binary variable in testnet scripts ([lighthouse#3823](https://github.com/sigp/lighthouse/pull/3823)): small fix to local testnet script ## Good resources - [Terence's notes on how 4844 impacts mev builders, relayers and mev-boost](https://arbitrum.notion.site/4844-with-builders-and-relayers-983d73528390468c89edb3f8be2ed482): nice explainer on the changes and reasons behind, especially on the builder/relayer side, would be very useful for [relay-specs](https://github.com/flashbots/relay-specs) update ## and That's it.. ..for this year! :) Thanks for reading and have a happy holiday everyone! :santa: :christmas_tree: See you in the next one :wave: