tl;dr: Over the past couple of days, some L2s observed that their deployments on Sepolia did not work correctly anymore. This is because of EIP-7594 which adjustments the format for proofs. In anticipation of Fusaka, we urge all blob originators to replace their software program to create Cell Proofs as a substitute of blob proofs.
Background
One underdiscussed side of EIP-7549 (PeerDAS) is that it adjustments the format for proofs from blob proofs to cell proofs. This permits for downloading a particular a part of the blob as a substitute of the entire blob for knowledge availability sampling.
This transformation may break person purposes that ship blob transactions. Already signed transactions are nonetheless legitimate although, they only must recompute the cell proofs. Some shoppers (most notably go-ethereum) will do that through the RPC on eth_sendTransaction and eth_sendRawTransaction (1). This conversion from blob proofs to cell proofs takes about one second, so we encourage blob transaction originators to maneuver to cell proofs with the intention to cut back overhead on the RPC degree.
Transactions which might be within the txpool on the time of the fork will probably be dropped by some implementations, whereas different implementations will convert them to cell proofs. So it might be prudent to resend your transactions with cell proofs shortly after the fork, if they don’t seem to be being included by the chain. Some implementations enable for the distribution of blob proof transactions up to a couple minutes after the laborious fork on the networking layer for stability functions.
Actionable adjustments
In case you are a blob transaction originator (e.g. an L2), you must replace your transaction sending code to create cell proofs.
All main consumer libraries expose performance to create these proofs through ComputeCellsAndKZGProofs() which is offered in all main languages (2). Utilization examples will also be present in all main languages within the consumer libraries (3).
Outlook
We’ll attempt to talk these adjustments that affect customers extra clearly through the Ethereum weblog going ahead and attempt to do extra group outreach to forestall customers of Ethereum from feeling blindsided by adjustments within the protocol.
We additionally encourage L2s and different entities that closely rely on the Ethereum roadmap to comply with the ACD course of and to interact extra straight with the group. We’d additionally wish to encourage groups to deploy their contracts and check infrastructure on the devnets shortly earlier than we transfer to the primary testnets.
One other useful gizmo for preserving your adjustments updated is to make use of the Ethereum bundle supplied by Kurtosis which can be utilized to create native networks with the most recent specs (4).
Whereas it’s unlucky that blob originators discovered this late within the laborious fork course of, it additionally exhibits that the testnet course of works very properly and these points are caught lengthy earlier than they’d ever seem on mainnet.
(1): go-ethereum will solely do the conversion on eth_sendRawTransaction from present grasp and v1.16.5 onwards (2): see https://github.com/search?q=repopercent3Aethereumpercent2Fc-kzg-4844percent20ComputeCellsAndKZGProofs&sort=code (3) Instance for go-ethereum: https://github.com/ethereum/go-ethereum/blob/7c107c2691fa66a1da60e2b95f5946c3a3921b00/crypto/kzg4844/kzg4844_test.go#L194 (4) Ethereum bundle for kurtosis: https://github.com/ethpandaops/ethereum-package
