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Merge pull request #2034 from ethereum/vbuterin-patch-5 

Add a constant for slash penalty multiplier
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Danny Ryan 2020-09-06 21:00:40 -04:00 committed by GitHub
parent 3da7e32068 c995da420e
commit 88cdc5bc80
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3 changed files with 7 additions and 2 deletions
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2
configs/mainnet/phase0.yaml
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@ -27,6 +27,8 @@ HYSTERESIS_QUOTIENT: 4
HYSTERESIS_DOWNWARD_MULTIPLIER: 1 HYSTERESIS_DOWNWARD_MULTIPLIER: 1
# 5 (plus 1.25) # 5 (plus 1.25)
HYSTERESIS_UPWARD_MULTIPLIER: 5 HYSTERESIS_UPWARD_MULTIPLIER: 5
# 3
PROPORTIONAL_SLASHING_MULTIPLIER: 3
# Fork Choice # Fork Choice

3
configs/minimal/phase0.yaml
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@ -26,7 +26,8 @@ HYSTERESIS_QUOTIENT: 4
HYSTERESIS_DOWNWARD_MULTIPLIER: 1 HYSTERESIS_DOWNWARD_MULTIPLIER: 1
# 5 (plus 1.25) # 5 (plus 1.25)
HYSTERESIS_UPWARD_MULTIPLIER: 5 HYSTERESIS_UPWARD_MULTIPLIER: 5
# 3
PROPORTIONAL_SLASHING_MULTIPLIER: 3
# Fork Choice # Fork Choice

4
specs/phase0/beacon-chain.md
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@ -195,6 +195,7 @@ The following values are (non-configurable) constants used throughout the specif
| `HYSTERESIS_QUOTIENT` | `uint64(4)` | | `HYSTERESIS_QUOTIENT` | `uint64(4)` |
| `HYSTERESIS_DOWNWARD_MULTIPLIER` | `uint64(1)` | | `HYSTERESIS_DOWNWARD_MULTIPLIER` | `uint64(1)` |
| `HYSTERESIS_UPWARD_MULTIPLIER` | `uint64(5)` | | `HYSTERESIS_UPWARD_MULTIPLIER` | `uint64(5)` |
| `PROPORTIONAL_SLASHING_MULTIPLIER` | `uint64(3)` |
- For the safety of committees, `TARGET_COMMITTEE_SIZE` exceeds [the recommended minimum committee size of 111](http://web.archive.org/web/20190504131341/https://vitalik.ca/files/Ithaca201807_Sharding.pdf); with sufficient active validators (at least `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures committee sizes of at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness with a Verifiable Delay Function (VDF) will improve committee robustness and lower the safe minimum committee size.) - For the safety of committees, `TARGET_COMMITTEE_SIZE` exceeds [the recommended minimum committee size of 111](http://web.archive.org/web/20190504131341/https://vitalik.ca/files/Ithaca201807_Sharding.pdf); with sufficient active validators (at least `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures committee sizes of at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness with a Verifiable Delay Function (VDF) will improve committee robustness and lower the safe minimum committee size.)
@ -1554,10 +1555,11 @@ def process_registry_updates(state: BeaconState) -> None:
def process_slashings(state: BeaconState) -> None: def process_slashings(state: BeaconState) -> None:
epoch = get_current_epoch(state) epoch = get_current_epoch(state)
total_balance = get_total_active_balance(state) total_balance = get_total_active_balance(state)
adjusted_total_slashing_balance = min(sum(state.slashings) * PROPORTIONAL_SLASHING_MULTIPLIER, total_balance)
for index, validator in enumerate(state.validators): for index, validator in enumerate(state.validators):
if validator.slashed and epoch + EPOCHS_PER_SLASHINGS_VECTOR // 2 == validator.withdrawable_epoch: if validator.slashed and epoch + EPOCHS_PER_SLASHINGS_VECTOR // 2 == validator.withdrawable_epoch:
increment = EFFECTIVE_BALANCE_INCREMENT # Factored out from penalty numerator to avoid uint64 overflow increment = EFFECTIVE_BALANCE_INCREMENT # Factored out from penalty numerator to avoid uint64 overflow
penalty_numerator = validator.effective_balance // increment * min(sum(state.slashings) * 3, total_balance) penalty_numerator = validator.effective_balance // increment * adjusted_total_slashing_balance
penalty = penalty_numerator // total_balance * increment penalty = penalty_numerator // total_balance * increment
decrease_balance(state, ValidatorIndex(index), penalty) decrease_balance(state, ValidatorIndex(index), penalty)
``` ```