From b35f8fff7410d42b9af911d181569f3dfd66118f Mon Sep 17 00:00:00 2001 From: vbuterin Date: Wed, 2 Sep 2020 12:26:27 +0800 Subject: [PATCH] Add a constant for slash penalty multiplier Make the multipler on slashed penalties (if portion `p` of validators are slashed each one loses `k*p` an explicit constant). --- specs/phase0/beacon-chain.md | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/specs/phase0/beacon-chain.md b/specs/phase0/beacon-chain.md index ca7b0b858..c302e46c5 100644 --- a/specs/phase0/beacon-chain.md +++ b/specs/phase0/beacon-chain.md @@ -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) ```