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EIP4844: Clarify ratelimit behavior for sidecar with zero blobs #3174

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Jan 12, 2023
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4 changes: 4 additions & 0 deletions specs/eip4844/p2p-interface.md
Original file line number Diff line number Diff line change
Expand Up @@ -226,6 +226,8 @@ The request MUST be encoded as an SSZ-container.
The response MUST consist of zero or more `response_chunk`.
Each _successful_ `response_chunk` MUST contain a single `BlobsSidecar` payload.

In cases where a slot contains a `BlobSidecar` that does not contain any blobs, but contain non-zero `beacon_block_root` and `beacon_block_slot`, no `blobs_sidecar` is returned.
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Clients MUST keep a record of signed blobs sidecars seen on the epoch range
`[max(current_epoch - MIN_EPOCHS_FOR_BLOBS_SIDECARS_REQUESTS, EIP4844_FORK_EPOCH), current_epoch]`
where `current_epoch` is defined by the current wall-clock time,
Expand All @@ -247,6 +249,8 @@ disconnect and/or temporarily ban such an un-synced or semi-synced client.
Clients MUST respond with at least the first blobs sidecar that exists in the range, if they have it,
and no more than `MAX_REQUEST_BLOBS_SIDECARS` sidecars.

Clients MUST not respond with empty blobs sidecars.
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To clarify what an "empty" blob sidecar is. It's a BlobSidecar that does not contain any blobs, but it may contain a non-zero beacon_block_root and beacon_block_slot per get_blobs_sidecar.

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Suggested change
Clients MUST not respond with empty blobs sidecars.
Clients MAY skip empty blobs sidecars.


The following blobs sidecars, where they exist, MUST be sent in consecutive order.

Clients MAY limit the number of blobs sidecars in the response.
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