(The following note are copied from blog post ‣ )

Note for all partners

Partners who run sequencer and follower nodes (l2geth)

The new version of l2geth node is v5.3.0 (release note). This upgrade is a hard fork as it introduces the new blob data type and the SHA2-256 precompiled contract. Operators running an l2geth node are required to upgrade before the hard fork block.

Partners who run prover nodes

TBD

Partners who decode or index on-chain batch data

This upgrade changes the format that Scroll uses to publish data to Ethereum. Indexers that rely on this data should carefully review the new BatchHeader format:

Field Bytes Type Index Comments
version 1 uint8 0 The version of BatchHeader’s codex
batchIndex 8 uint64 1 The index of the batch
l1MessagePopped 8 uint64 9 Number of L1 messages popped in the batch
totalL1MessagePopped 8 uint64 17 Number of total L1 messages popped after the batch
dataHash 32 bytes32 25 The data hash of the batch
blobVersionedHash 32 bytes32 57 The versioned hash of the blob with this batch’s data
parentBatchHash 32 bytes32 89 The parent batch hash
skippedL1MessageBitmap dynamic uint256[] 121 A bitmap to indicate which L1 messages are skipped in the batch

Note the format is different from the existing data format. Indexers will need to check whether their decoders need to be adjusted. A summary of the new format:

Partners who run chunk nodes

see this doc how to run a prover