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Merge pull request #2299 from ralexstokes/update-altair-p2p 

Fix language with sync committee selection proofs
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Alex Stokes 2021-04-05 11:03:36 -07:00 committed by GitHub
parent 06c75ef55e 9aaf548c37
commit bf7c61ff30
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2 changed files with 5 additions and 5 deletions
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2
specs/altair/p2p-interface.md
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@ -92,7 +92,7 @@ The following validations MUST pass before forwarding the `signed_contribution_a
- _[REJECT]_ `contribution_and_proof.selection_proof` selects the validator as an aggregator for the slot -- i.e. `is_sync_committee_aggregator(state, contribution.slot, contribution_and_proof.selection_proof)` returns `True`. - _[REJECT]_ `contribution_and_proof.selection_proof` selects the validator as an aggregator for the slot -- i.e. `is_sync_committee_aggregator(state, contribution.slot, contribution_and_proof.selection_proof)` returns `True`.
- _[REJECT]_ The aggregator's validator index is within the current sync committee -- - _[REJECT]_ The aggregator's validator index is within the current sync committee --
i.e. `state.validators[contribution_and_proof.aggregator_index].pubkey in state.current_sync_committee.pubkeys`. i.e. `state.validators[contribution_and_proof.aggregator_index].pubkey in state.current_sync_committee.pubkeys`.
- _[REJECT]_ The `contribution_and_proof.selection_proof` is a valid signature of the `contribution.slot` by the validator with index `contribution_and_proof.aggregator_index`. - _[REJECT]_ The `contribution_and_proof.selection_proof` is a valid signature of the `SyncCommitteeSigningData` derived from the `contribution` by the validator with index `contribution_and_proof.aggregator_index`.
- _[REJECT]_ The aggregator signature, `signed_contribution_and_proof.signature`, is valid. - _[REJECT]_ The aggregator signature, `signed_contribution_and_proof.signature`, is valid.
- _[REJECT]_ The aggregate signature is valid for the message `beacon_block_root` and aggregate pubkey derived from the participation info in `aggregation_bits` for the subcommittee specified by the `subcommittee_index`. - _[REJECT]_ The aggregate signature is valid for the message `beacon_block_root` and aggregate pubkey derived from the participation info in `aggregation_bits` for the subcommittee specified by the `subcommittee_index`.

6
specs/altair/validator.md
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@ -310,11 +310,11 @@ Each slot some sync committee members in each subcommittee are selected to aggre
##### Aggregation selection ##### Aggregation selection
A validator is selected to aggregate based on the computation in `is_sync_committee_aggregator` where `state` is a `BeaconState` as supplied to `get_sync_committee_slot_signature` and `signature` is the BLS signature returned by `get_sync_committee_slot_signature`. A validator is selected to aggregate based on the computation in `is_sync_committee_aggregator` where `state` is a `BeaconState` as supplied to `get_sync_committee_selection_proof` and `signature` is the BLS signature returned by `get_sync_committee_selection_proof`.
The signature function takes a `BeaconState` with the relevant sync committees for the queried `slot` (i.e. `state.slot` is within the span covered by the current or next sync committee period), the `subcommittee_index` equal to the `subnet_id`, and the `privkey` is the BLS private key associated with the validator. The signature function takes a `BeaconState` with the relevant sync committees for the queried `slot` (i.e. `state.slot` is within the span covered by the current or next sync committee period), the `subcommittee_index` equal to the `subnet_id`, and the `privkey` is the BLS private key associated with the validator.
```python ```python
def get_sync_committee_slot_signature(state: BeaconState, slot: Slot, def get_sync_committee_selection_proof(state: BeaconState, slot: Slot,
subcommittee_index: uint64, privkey: int) -> BLSSignature: subcommittee_index: uint64, privkey: int) -> BLSSignature:
domain = get_domain(state, DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF, compute_epoch_at_slot(slot)) domain = get_domain(state, DOMAIN_SYNC_COMMITTEE_SELECTION_PROOF, compute_epoch_at_slot(slot))
signing_data = SyncCommitteeSigningData( signing_data = SyncCommitteeSigningData(
@ -378,7 +378,7 @@ def get_contribution_and_proof(state: BeaconState,
aggregator_index: ValidatorIndex, aggregator_index: ValidatorIndex,
contribution: SyncCommitteeContribution, contribution: SyncCommitteeContribution,
privkey: int) -> ContributionAndProof: privkey: int) -> ContributionAndProof:
selection_proof = get_sync_committee_slot_signature( selection_proof = get_sync_committee_selection_proof(
state, state,
contribution.slot, contribution.slot,
contribution.subcommittee_index, contribution.subcommittee_index,