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Add a constant for slash penalty multiplier

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Make the multipler on slashed penalties (if portion `p` of validators are slashed each one loses `k*p` an explicit constant).
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vbuterin 2020-09-02 12:26:27 +08:00 committed by GitHub
parent 3da7e32068
commit b35f8fff74
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1 changed files with 2 additions and 1 deletions
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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_DOWNWARD_MULTIPLIER` | `uint64(1)` |
| `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.)
@ -1557,7 +1558,7 @@ def process_slashings(state: BeaconState) -> None:
for index, validator in enumerate(state.validators):
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
penalty_numerator = validator.effective_balance // increment * min(sum(state.slashings) * 3, total_balance)
penalty_numerator = validator.effective_balance // increment * min(sum(state.slashings) * PROPORTIONAL_SLASHING_MULTIPLIER, total_balance)
penalty = penalty_numerator // total_balance * increment
decrease_balance(state, ValidatorIndex(index), penalty)
```