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Merge pull request #8 from ethereum/reward-fixes 

Minor rewards fixes
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Danny Ryan 2018-09-25 11:19:15 -05:00 committed by GitHub
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specs/casper_sharding_v2.1.md
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@ -378,7 +378,7 @@ Let `time_since_finality = block.slot_number - last_finalized_slot`, and let `B`
For each slot `S` in the range `last_state_recalc - CYCLE_LENGTH ... last_state_recalc - 1`:
* Let `total_participated_deposits` be the total balance of validators that voted for the correct hash in slot `S` (ie. the hash that actually is the hash of the block at that slot in the current chain); note that in the normal case, every validator will be in one of the `CYCLE_LENGTH` slots following the slot and so can vote for a hash in slot `S`. If `time_since_finality <= 2 * CYCLE_LENGTH`, then adjust participating and non-participating validators' balances as follows:
* Let `total_participated_deposits` be the total balance of validators that voted for the correct hash in slot `S` (ie. the hash that actually is the hash of the block at that slot in the current chain); note that in the normal case, every validator will be in one of the `CYCLE_LENGTH` slots following the slot and so can vote for a hash in slot `S`. If `time_since_finality <= 3 * CYCLE_LENGTH`, then adjust participating and non-participating validators' balances as follows:
* Participating validators gain `B // reward_quotient * (2 * total_participated_deposits - total_deposits) // total_deposits` (note: this may be negative)
* Nonparticipating validators lose `B // reward_quotient`
* Otherwise, adjust as follows:
@ -387,13 +387,13 @@ For each slot `S` in the range `last_state_recalc - CYCLE_LENGTH ... last_state_
#### Balance recalculations related to crosslink rewards
For each shard S for which a crosslink committee exists in this epoch, let V be the corresponding validator set. Let `B` be the balance of any given validator whose balance we are adjusting, not including any balance changes from this round of state recalculation. For each S, V do the following:
For each shard S for which a crosslink committee exists in the cycle prior to the most recent cycle (`last_state_recalc - CYCLE_LENGTH ... last_state_recalc - 1`), let V be the corresponding validator set. Let `B` be the balance of any given validator whose balance we are adjusting, not including any balance changes from this round of state recalculation. For each S, V do the following:
* Let `total_v_deposits` be the total balance of V, and `total_participated_v_deposits` be the total balance of the subset of V that participated (note: it's always true that `total_participated_v_deposits <= total_v_deposits`)
* Let `time_since_last_confirmation` be `block.slot_number - crosslink_records[S].slot`
* Adjust balances as follows:
* If `crosslink_records[S].dynasty == current_dynasty`, no reward adjustments
* Otherwise, participating validators' balances are increased by `B // reward_quotient * (2 * total_participated_v_deposits // total_v_deposits - 1)`, and non-participating validators' balances are decreased by `B // reward_quotient + B // reward_quotient // 2 + time_since_finality // quadratic_penalty_quotient`
* Otherwise, participating validators' balances are increased by `B // reward_quotient * (2 * total_participated_v_deposits // total_v_deposits - 1)`, and non-participating validators' balances are decreased by `B // reward_quotient + time_since_finality // quadratic_penalty_quotient`
Finally: