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Make block proposal direction more clear

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Hsiao-Wei Wang 2022-07-15 23:29:22 +08:00
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specs/eip4844/validator.md
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@ -21,6 +21,7 @@
- [`compute_aggregated_poly_and_commitment`](#compute_aggregated_poly_and_commitment)
- [`verify_blobs_sidecar`](#verify_blobs_sidecar)
- [`compute_proof_from_blobs`](#compute_proof_from_blobs)
- [`get_blobs_and_kzg_commitments`](#get_blobs_and_kzg_commitments)
- [Beacon chain responsibilities](#beacon-chain-responsibilities)
- [Block proposal](#block-proposal)
- [Constructing the `BeaconBlockBody`](#constructing-the-beaconblockbody)
@ -171,6 +172,18 @@ def compute_proof_from_blobs(blobs: Sequence[BLSFieldElement]) -> KZGProof:
return compute_kzg_proof(aggregated_poly, x)
```
### `get_blobs_and_kzg_commitments`
The interface to retrieve blobs and corresponding kzg commitments.
Note: This API is *unstable*. `get_blobs_and_kzg_commitments` and `get_payload` may be unified.
Implementers may also retrieve blobs individually per transaction.
```python
def get_blobs_and_kzg_commitments(payload_id: PayloadId) -> Tuple[Sequence[BLSFieldElement], Sequence[KZGCommitment]]:
...
```
## Beacon chain responsibilities
All validator responsibilities remain unchanged other than those noted below.
@ -182,33 +195,28 @@ Namely, the blob handling and the addition of `BlobsSidecar`.
##### Blob KZG commitments
After retrieving the execution payload from the execution engine as specified in Bellatrix,
the blobs are retrieved and processed:
1. After retrieving the execution payload from the execution engine as specified in Bellatrix,
use the `payload_id` to retrieve `blobs` and `blob_kzg_commitments` via `get_blobs_and_kzg_commitments(payload_id)`.
2. Verify `blobs` and `blob_kzg_commitments`:
```
# execution_payload = execution_engine.get_payload(payload_id)
# block.body.execution_payload = execution_payload
# ...
```python
def verify_blobs_and_kzg_commitments(execution_payload: ExecutionPayload,
blobs: Sequence[BLSFieldElement],
blob_kzg_commitments: Sequence[KZGCommitment]) -> bool:
# Optionally sanity-check that the KZG commitments match the versioned hashes in the transactions
assert verify_kzg_commitments_against_transactions(execution_payload.transactions, blob_kzg_commitments)
blobs, blob_kzg_commitments = get_blobs(payload_id)
# Optionally sanity-check that the KZG commitments match the versioned hashes in the transactions
assert verify_kzg_commitments_against_transactions(execution_payload.transactions, blob_kzg_commitments)
# Optionally sanity-check that the KZG commitments match the blobs (as produced by the execution engine)
assert len(blob_kzg_commitments) == len(blobs)
assert [blob_to_kzg_commitment(blob) == commitment for blob, commitment in zip(blobs, blob_kzg_commitments)]
# Update the block body
block.body.blob_kzg_commitments = blob_kzg_commitments
# Optionally sanity-check that the KZG commitments match the blobs (as produced by the execution engine)
assert len(blob_kzg_commitments) == len(blobs)
assert [blob_to_kzg_commitment(blob) == commitment for blob, commitment in zip(blobs, blob_kzg_commitments)]
return True
```
The `blobs` should be held with the block in preparation of publishing.
3. If valid, set `block.body.blob_kzg_commitments = blob_kzg_commitments`.
Note that the `blobs` should be held with the block in preparation of publishing.
Without the `blobs`, the published block will effectively be ignored by honest validators.
Note: This API is *unstable*. `get_blobs` and `get_payload` may be unified.
Implementers may also retrieve blobs individually per transaction.
### Beacon Block publishing time
Before publishing a prepared beacon block proposal, the corresponding blobs are packaged into a sidecar object for distribution to the network: