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require aggregation bits to have at least one participant in sync contributions

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Danny Ryan 2021-07-21 11:03:19 -06:00
parent 947ca9082c
commit 02a9fc460e
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2 changed files with 3 additions and 1 deletions
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2
specs/altair/p2p-interface.md
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@ -139,6 +139,8 @@ def get_sync_subcommittee_pubkeys(state: BeaconState, subcommittee_index: uint64
- _[IGNORE]_ The contribution's slot is for the current slot (with a `MAXIMUM_GOSSIP_CLOCK_DISPARITY` allowance), i.e. `contribution.slot == current_slot`.
- _[REJECT]_ The subcommittee index is in the allowed range, i.e. `contribution.subcommittee_index < SYNC_COMMITTEE_SUBNET_COUNT`.
- _[REJECT]_ The contribution has participants --
that is, `len(set(bit for bit in contribution.aggregation_bits if bit == True)) >= 1`.
- _[REJECT]_ `contribution_and_proof.selection_proof` selects the validator as an aggregator for the slot -- i.e. `is_sync_committee_aggregator(contribution_and_proof.selection_proof)` returns `True`.
- _[REJECT]_ The aggregator's validator index is in the declared subcommittee of the current sync committee --
i.e. `state.validators[contribution_and_proof.aggregator_index].pubkey in get_sync_subcommittee_pubkeys(state, contribution.subcommittee_index)`.

2
specs/altair/validator.md
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@ -354,7 +354,7 @@ def is_sync_committee_aggregator(signature: BLSSignature) -> bool:
If a validator is selected to aggregate the `SyncCommitteeMessage`s produced on a subnet during a given `slot`, they construct an aggregated `SyncCommitteeContribution`.
Given all of the (valid) collected `sync_committee_messages: Set[SyncCommitteeMessage]` from the `sync_committee_{subnet_id}` gossip during the selected `slot` with an equivalent `beacon_block_root` to that of the aggregator, the aggregator creates a `contribution: SyncCommitteeContribution` with the following fields:
Collect all of the (valid) `sync_committee_messages: Set[SyncCommitteeMessage]` from the `sync_committee_{subnet_id}` gossip during the selected `slot` with an equivalent `beacon_block_root` to that of the aggregator. If `len(sync_committee_messages) > 0`, the aggregator creates a `contribution: SyncCommitteeContribution` with the following fields:
###### Slot