Thread by @optimismPBC

Today on Ethereum #AllCoreDevs, our very own @protolambda presented EIP-4844: Shard Blob Transactions.



With the potential to decrease fees by 100x for all rollups, and a practical path to implementation, we strongly support this EIP.

But how, you ask?🧶

In short: introduce a new transaction format for posting “data blobs” to L1, which contain arbitrary data for use in rollups. This idea was introduced by @dankrad and @VitalikButerin...
notes.ethereum.org/@vbuterin/blob…

....and then continued by @protolambda @LightClient @asn_d6 during ETHDenver:

https://twitter.com/protolambda/status/1495538289201188866

And now, all this work has been combined into EIP-4844:
eips.ethereum.org/EIPS/eip-4844

The property of blob data is that it:
- Does not need to be stored by L1 nodes as long as normal block data
- Is not directly accessible in the EVM

This is different from L1 calldata today. It’s sufficient to build a rollup, but has lower requirements per byte of data, since the EVM is not involved and the data can be pruned. This means that Ethereum can process much more rollup data without sacrificing decentralization.

The result would be that rollups can get up to 100x cheaper fees, without having to wait on the full version of #danksharding. It is designed to be forward-compatible with #danksharding however, meaning the advantages compound...

With data-availability-sampling, nodes will be able to determine the availability of these blobs without downloading it all themselves—AKA data-sharding! This would get us yet another 10x—all without further changes to the execution-layer.

This is extremely compelling, and a concerted effort to build out the prototype presented on ACD today began at ETHDenver.

https://twitter.com/protolambda/status/1495538286332624898

Optimism is in strong support of this EIP. We’re already contributing time and effort to make it happen, and we hope that our peers in the rollup space will follow suit. This benefits us all equally. Positive sum for the win—we will be better together! ❤️🌈