EIP-4844: consensus-layer specs of Shard Blob Transactions #2850
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protolambda
added
general:enhancement
This was referenced Mar 10, 2022
Thank you ❤️ 😄 |
Co-Authored-By: terenc3t <[email protected]> Co-Authored-By: djrtwo <[email protected]>
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Implemented changes based on review, thank you @terencechain and @djrtwo. And opened #2852 to track the remaining items like pyspec changes and move of download requirement from validator-doc to fork-choice-doc. |
djrtwo
approved these changes
Mar 15, 2022
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thank you @protolambda!
we'll merge this and move to the tracking issue for subsequent convo and development.
I really like that this is in a "feature" dir so it makes the notion of merging soon much easier :)
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This PR outlines the consensus-layer changes for EIP-4844.
Changes (split across multiple docs like other hardforks, in a "feature directory" named
eip4844):BeaconBlockBodyto track the KZG commitments of the blobsBlobsSidecarto sync blobs.Also note the(edit: not adding theshardfield for forward compatibility - I think we can afford the mere 8 zero bytes in the blobs type to be compatible with a likely path forward with full sharding.shardfield anymore)SignedBlobsSidecarto gossip blobs: initially the signature is available. Long-term we cannot rely on the sidecar signature being available however, blobs are synced without signture (but still verified with KZG against the beacon block). The signature functions as a spam protection in gossip.fork.mdto define how to proceed with EIP-4844 testnet upgrade.BlobsSidecarsByRangeto sync blobs: no by-root equivalent since the expectation is to sync blobs after having a reference beacon chain that misses them. Additionally the serving span is reduced to a month (data availability period caps it naturally) compared to that of 5 months of beacon blocks. And nostephere, based on previous complaints dev-feedback about the beacon blocks variant.Possible TODO (or maybe for a later PR): the honest-validator spec covers the blob download obligation currently, but we should maybe emphasize it as a forkchoice-dependency. I am not aware of a dependency system in the existing fork-choice docs though, so it may require some refactoring (help/feedback appreciated there).
Once the EIP has gone through more testing and review, and once there is rough-consensus on inclusion in a hardfork, then we can merge the
eip4844feature-directory with other consensus features of that hardfork. The next consensus fork after the Merge, dubbedCapellacurrently, being the primary target.In a follow-up PR I can work on enabling pyspec generation from this feature set, and corresponding testing. Need a stable base + format first before we refactor code-gen to support features instead of just phases.