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Update beacon-chain.md

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vbuterin 2018-10-19 16:01:15 -04:00 committed by GitHub
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@ -818,6 +818,23 @@ If `block.slot % SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD == 0`, then:
* Set `current_persistent_committees = next_persistent_committees`
* Set `next_persistent_committees = get_persistent_shuffling(validators, active_state.randao_mix)`
```
### Possible alternative (run every state recalculation):
active_validator_indices = get_active_validator_indices(validators)
for i in range(len(active_validator_indices) // SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD):
vid = active_validator_indices[hash(active_state.randao_mix + bytes8(i * 2)) % len(active_validator_indices)]
new_shard = hash(active_state.randao_mix + bytes8(i * 2 + 1)) % SHARD_COUNT
crystallized_state.persistent_shard_reassignments.append(ShardReassignmentRecord(validator_id=vid, shard=new_shard, slot=block.slot + SHARD_PERSISTENT_COMMITTEE_CHANGE_PERIOD))
while len(crystallized_state.persistent_shard_reassignments) > 0 and crystallized_state.persistent_shard_reassignments[0].slot <= block.slot:
rec = crystallized_state.persistent_shard_reassignments[0]
for c in crystallized_state.current_persistent_committees:
if rec.validator_id in c:
c.pop(c.index(rec.validator_id))
crystallized_state.current_persistent_committees[rec.shard].append(vid)
```
### TODO
Note: This spec is ~60% complete.