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Merge pull request #2370 from ralexstokes/simplify-sync-committee-aggregates

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Simplify sync committee aggregates
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Danny Ryan 2021-05-06 12:38:49 -06:00 committed by GitHub
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3 changed files with 12 additions and 10 deletions
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2
configs/mainnet/altair.yaml
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@ -14,8 +14,6 @@ PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR: 2
# ---------------------------------------------------------------
# 2**10 (= 1,024)
SYNC_COMMITTEE_SIZE: 1024
# 2**6 (= 64)
SYNC_PUBKEYS_PER_AGGREGATE: 64
# 2**2 (= 4)
INACTIVITY_SCORE_BIAS: 4

2
configs/minimal/altair.yaml
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@ -14,8 +14,6 @@ PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR: 2
# ---------------------------------------------------------------
# [customized]
SYNC_COMMITTEE_SIZE: 32
# [customized]
SYNC_PUBKEYS_PER_AGGREGATE: 16
# 2**2 (= 4)
INACTIVITY_SCORE_BIAS: 4

18
specs/altair/beacon-chain.md
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@ -119,7 +119,6 @@ This patch updates a few configuration values to move penalty parameters closer
| Name | Value |
| - | - |
| `SYNC_COMMITTEE_SIZE` | `uint64(2**10)` (= 1,024) |
| `SYNC_PUBKEYS_PER_AGGREGATE` | `uint64(2**6)` (= 64) |
| `INACTIVITY_SCORE_BIAS` | `uint64(4)` |
### Time parameters
@ -212,7 +211,7 @@ class SyncAggregate(Container):
```python
class SyncCommittee(Container):
pubkeys: Vector[BLSPubkey, SYNC_COMMITTEE_SIZE]
pubkey_aggregates: Vector[BLSPubkey, SYNC_COMMITTEE_SIZE // SYNC_PUBKEYS_PER_AGGREGATE]
aggregate_pubkey: BLSPubkey
```
## Helper functions
@ -303,12 +302,19 @@ def get_sync_committee_indices(state: BeaconState, epoch: Epoch) -> Sequence[Val
def get_sync_committee(state: BeaconState, epoch: Epoch) -> SyncCommittee:
"""
Return the sync committee for a given ``state`` and ``epoch``.
``SyncCommittee`` contains an aggregate pubkey that enables
resource-constrained clients to save some computation when verifying
the sync committee's signature.
``SyncCommittee`` can also contain duplicate pubkeys, when ``get_sync_committee_indices``
returns duplicate indices. Implementations must take care when handling
optimizations relating to aggregation and verification in the presence of duplicates.
"""
indices = get_sync_committee_indices(state, epoch)
pubkeys = [state.validators[index].pubkey for index in indices]
partition = [pubkeys[i:i + SYNC_PUBKEYS_PER_AGGREGATE] for i in range(0, len(pubkeys), SYNC_PUBKEYS_PER_AGGREGATE)]
pubkey_aggregates = [bls.AggregatePKs(preaggregate) for preaggregate in partition]
return SyncCommittee(pubkeys=pubkeys, pubkey_aggregates=pubkey_aggregates)
aggregate_pubkey = bls.AggregatePKs(pubkeys)
return SyncCommittee(pubkeys=pubkeys, aggregate_pubkey=aggregate_pubkey)
```
#### `get_base_reward_per_increment`
@ -409,7 +415,7 @@ def get_inactivity_penalty_deltas(state: BeaconState) -> Tuple[Sequence[Gwei], S
#### Modified `slash_validator`
*Note*: The function `slash_validator` is modified to use `MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR`
*Note*: The function `slash_validator` is modified to use `MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR`
and use `PROPOSER_WEIGHT` when calculating the proposer reward.
```python