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Merge pull request #3628 from mehdi-aouadi/eip-7549-onchain-aggregation 

EIP-7549 Clarify network vs on chain aggregation
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Mikhail Kalinin 2024-03-22 16:11:21 +06:00 committed by GitHub
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specs/_features/eip7549/validator.md
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@ -26,7 +26,24 @@
##### Attestations
Attestations received from aggregators with disjoint `committee_bits` sets and equal `AttestationData` SHOULD be consolidated into a single `Attestation` object.
The network attestation aggregates contain only the assigned committee attestations.
Attestation aggregates received by the block proposer from the committee aggregators with disjoint `committee_bits` sets and equal `AttestationData` SHOULD be consolidated into a single `Attestation` object.
The proposer should run the following function to construct an on chain final aggregate form a list of network aggregates with equal `AttestationData`:
```python
def compute_on_chain_aggregate(network_aggregates: List[Attestation]) -> Attestation:
aggregates = sorted(network_aggregates, key=lambda a: get_committee_indices(a.committee_bits)[0])
data = aggregates[0].data
aggregation_bits = [a.aggregation_bits[0] for a in aggregates]
signature = bls.Aggregate([a.signature for a in aggregates])
committee_indices = [get_committee_indices(a.committee_bits)[0] for a in aggregates]
committee_flags = [(index in committee_indices) for index in range(0, MAX_COMMITTEES_PER_SLOT)]
committee_bits = Bitvector[MAX_COMMITTEES_PER_SLOT](committee_flags)
return Attestation(aggregation_bits, data, committee_bits, signature)
```
### Attesting