75 lines
3.2 KiB
Markdown
75 lines
3.2 KiB
Markdown
# Deneb -- Honest Validator
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## Table of contents
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<!-- TOC -->
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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- [Modifications in EIP-7549](#modifications-in-eip-7549)
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- [Block proposal](#block-proposal)
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- [Constructing the `BeaconBlockBody`](#constructing-the-beaconblockbody)
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- [Attester slashings](#attester-slashings)
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- [Attestations](#attestations)
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- [Attesting](#attesting)
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- [Construct attestation](#construct-attestation)
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- [Attestation aggregation](#attestation-aggregation)
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- [Construct aggregate](#construct-aggregate)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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<!-- /TOC -->
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## Modifications in EIP-7549
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### Block proposal
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#### Constructing the `BeaconBlockBody`
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##### Attester slashings
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Changed the max attestations size to `MAX_ATTESTER_SLASHINGS_EIP7549`.
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##### Attestations
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The network attestation aggregates contain only the assigned committee attestations.
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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.
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The proposer should run the following function to construct an on chain final aggregate form a list of network aggregates with equal `AttestationData`:
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```python
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def compute_on_chain_aggregate(network_aggregates: Sequence[Attestation]) -> Attestation:
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aggregates = sorted(network_aggregates, key=lambda a: get_committee_indices(a.committee_bits)[0])
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data = aggregates[0].data
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aggregation_bits = Bitlist[MAX_VALIDATORS_PER_COMMITTEE * MAX_COMMITTEES_PER_SLOT]()
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for a in aggregates:
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for b in a.aggregation_bits:
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aggregation_bits.append(b)
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signature = bls.Aggregate([a.signature for a in aggregates])
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committee_indices = [get_committee_indices(a.committee_bits)[0] for a in aggregates]
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committee_flags = [(index in committee_indices) for index in range(0, MAX_COMMITTEES_PER_SLOT)]
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committee_bits = Bitvector[MAX_COMMITTEES_PER_SLOT](committee_flags)
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return Attestation(aggregation_bits, data, committee_bits, signature)
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```
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### Attesting
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#### Construct attestation
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- Set `attestation_data.index = 0`.
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- Let `attestation.aggregation_bits` be a `Bitlist[MAX_VALIDATORS_PER_COMMITTEE * MAX_COMMITTEES_PER_SLOT]` of length `len(committee)`, where the bit of the index of the validator in the `committee` is set to `0b1`.
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- Let `attestation.committee_bits` be a `Bitvector[MAX_COMMITTEES_PER_SLOT]`, where the bit at the index associated with the validator's committee is set to `0b1`.
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*Note*: Calling `get_attesting_indices(state, attestation)` should return a list of length equal to 1, containing `validator_index`.
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### Attestation aggregation
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#### Construct aggregate
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- Set `attestation_data.index = 0`.
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- Let `aggregation_bits` be a `Bitlist[MAX_VALIDATORS_PER_COMMITTEE * MAX_COMMITTEES_PER_SLOT]` of length `len(committee)`, where each bit set from each individual attestation is set to `0b1`.
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- Set `attestation.committee_bits = committee_bits`, where `committee_bits` has the same value as in each individual attestation.
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