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introduce ForkedBlobSidecar
for EIP-7688 Electra period before PeerDAS
#6451
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On `ELECTRA_FORK_EPOCH`, PeerDAS is not yet activated, hence the current mechanism based on `BlobSidecar` is still in use. With EIP-7688, the generalized indices of `BeaconBlockBody` get reindexed, changing the length of the inclusion proof within the `BlobSidecar`. Because network Req/Resp operations allow responses across fork boundaries, this creates the need for a `ForkedBlobSidecar` in that layer, same as already done for `ForkedSignedBeaconBock` for similar reasons. Note: This PR is only needed if PeerDAS is adopted _after_ EIP-7688. If PeerDAS is adopted _before_ EIP-7688, a similar PR may be needed for forked columns. Coincidental `Forked` jank can only be fully avoided if both features activate at the same epoch, actual changes to blobs aside. Delaying EIP-7688 for sole purpose of epoch alignemnt is not worth it.
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On
ELECTRA_FORK_EPOCH
, PeerDAS is not yet activated, hence the current mechanism based onBlobSidecar
is still in use. With EIP-7688, the generalized indices ofBeaconBlockBody
get reindexed, changing the length of the inclusion proof within theBlobSidecar
. Because network Req/Resp operations allow responses across fork boundaries, this creates the need for aForkedBlobSidecar
in that layer, same as already done forForkedSignedBeaconBock
for similar reasons.Note: This PR is only needed if PeerDAS is adopted after EIP-7688. If PeerDAS is adopted before EIP-7688, a similar PR may be needed for forked columns. Coincidental
Forked
jank can only be fully avoided if both features activate at the same epoch, actual changes to blobs aside. Delaying EIP-7688 for sole purpose of epoch alignemnt is not worth it.