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Update beacon-chain.md

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vbuterin 2018-10-11 09:45:33 -04:00 committed by GitHub
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@ -237,7 +237,7 @@ A `CrosslinkRecord` has the following fields:
```python ```python
{ {
# Since last validator set change? # Since last validator set change?
'recently_changed': 'int8', 'recently_changed': 'bool',
# Slot number # Slot number
'slot': 'int64', 'slot': 'int64',
# Beacon chain block hash # Beacon chain block hash
@ -426,7 +426,7 @@ def on_startup(initial_validator_entries):
cs = CrystallizedState() cs = CrystallizedState()
x = get_new_shuffling(bytes([0] * 32), validators, 0) x = get_new_shuffling(bytes([0] * 32), validators, 0)
cs.shard_and_committee_for_slots = x + x cs.shard_and_committee_for_slots = x + x
cs.crosslinks = [CrosslinkRecord(recently_changed=0, slot=0, hash=bytes([0] * 32)) cs.crosslinks = [CrosslinkRecord(recently_changed=False, slot=0, hash=bytes([0] * 32))
for i in range(SHARD_COUNT)] for i in range(SHARD_COUNT)]
# Setup active state # Setup active state
as = ActiveState() as = ActiveState()
@ -525,7 +525,7 @@ For every `(shard, shard_block_hash)` tuple:
* Let `total_balance_attesting_to_h` be the total balance of validators that attested to the shard block with hash `shard_block_hash`. * Let `total_balance_attesting_to_h` be the total balance of validators that attested to the shard block with hash `shard_block_hash`.
* Let `total_committee_balance` be the total balance in the committee of validators that could have attested to the shard block with hash `shard_block_hash`. * Let `total_committee_balance` be the total balance in the committee of validators that could have attested to the shard block with hash `shard_block_hash`.
* If `3 * total_balance_attesting_to_h >= 2 * total_committee_balance` and `recently_changed == 0`, set `crosslinks[shard] = CrosslinkRecord(recently_changed=1, slot=block.last_state_recalculation_slot + CYCLE_LENGTH, hash=shard_block_hash)`. * If `3 * total_balance_attesting_to_h >= 2 * total_committee_balance` and `recently_changed is False`, set `crosslinks[shard] = CrosslinkRecord(recently_changed=True, slot=block.last_state_recalculation_slot + CYCLE_LENGTH, hash=shard_block_hash)`.
#### Balance recalculations related to FFG rewards #### Balance recalculations related to FFG rewards
@ -555,7 +555,7 @@ For every shard number `shard` for which a crosslink committee exists in the cyc
* Let `total_balance_of_v` be the total balance of `V`. * Let `total_balance_of_v` be the total balance of `V`.
* Let `total_balance_of_v_participating` be the total balance of the subset of `V` that participated. * Let `total_balance_of_v_participating` be the total balance of the subset of `V` that participated.
* Let `time_since_last_confirmation = block.slot - crosslinks[shard].slot`. * Let `time_since_last_confirmation = block.slot - crosslinks[shard].slot`.
* If `recently_changed == 0`, adjust balances as follows: * If `recently_changed is False`, adjust balances as follows:
* Participating validators gain `B // reward_quotient * (2 * total_balance_of_v_participating - total_balance_of_v) // total_balance_of_v`. * Participating validators gain `B // reward_quotient * (2 * total_balance_of_v_participating - total_balance_of_v) // total_balance_of_v`.
* Non-participating validators lose `B // reward_quotient + B * time_since_last_confirmation // quadratic_penalty_quotient`. * Non-participating validators lose `B // reward_quotient + B * time_since_last_confirmation // quadratic_penalty_quotient`.
@ -639,7 +639,7 @@ def change_validators(validators):
Finally: Finally:
* Set `crystallized_state.validator_set_change_slot = crystallized_state.last_state_recalculation_slot` * Set `crystallized_state.validator_set_change_slot = crystallized_state.last_state_recalculation_slot`
* For all `c` in `crystallized_state.crosslinks`, set `c.recently_changed = 0` * For all `c` in `crystallized_state.crosslinks`, set `c.recently_changed = False`
* Let `next_start_shard = (shard_and_committee_for_slots[-1][-1].shard + 1) % SHARD_COUNT` * Let `next_start_shard = (shard_and_committee_for_slots[-1][-1].shard + 1) % SHARD_COUNT`
* Set `shard_and_committee_for_slots[CYCLE_LENGTH:] = get_new_shuffling(active_state.randao_mix, validators, next_start_shard)` * Set `shard_and_committee_for_slots[CYCLE_LENGTH:] = get_new_shuffling(active_state.randao_mix, validators, next_start_shard)`