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# System prepended metadata

title: Development updates week 4

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## Development updates week 4 

- Started working towards my project by adding support for holesky testnet.
Here's the PR link: https://github.com/ralexstokes/mev-rs/pull/120
This required adding support for holesky testnet in https://github.com/ralexstokes/ethereum-consensus.
PR for Holesky support in ethereum-consensus: https://github.com/ralexstokes/ethereum-consensus/pull/218


- Discovered the reth block builder by Jacob Kaufmann from the RustXEthereum talk hosted by Paradigm.
 Repo link: https://github.com/jacobkaufmann/evangelion
    Created my first PR on adding 32 bytes limit to extra_data field: https://github.com/jacobkaufmann/evangelion/pull/51