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Rework validator exiting, add min balance clause

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vbuterin 2018-10-11 14:14:48 -04:00 committed by GitHub
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specs/beacon-chain.md
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@ -43,6 +43,7 @@ The primary source of load on the beacon chain are "attestations". Attestations
| `BASE_REWARD_QUOTIENT` | 2**15 (= 32,768) | — |
| `MAX_VALIDATOR_CHURN_QUOTIENT` | 2**5 (= 32) | — |
| `LOGOUT_MESSAGE` | `"LOGOUT"` | — |
| `MIN_ONLINE_DEPOSIT_SIZE` | 2**4 (= 16) | ETH |
**Notes**
@ -560,6 +561,20 @@ def add_validator(validators: List[ValidatorRecord],
return index
```
## Routine for removing a validator
```python
def exit_validator(index, crystallized_state, penalize, current_slot):
v = crystallized_state.validators[index]
v.exit_slot = current_slot
if penalize:
v.status = PENALIZED
crystallized_state.deposits_penalized_in_period[current_slot // WITHDRAWAL_PERIOD] += v.balance
else:
v.status = PENDING_EXIT
add_validator_set_change_record(crystallized_state, index, v.pubkey, EXIT)
```
### Per-block processing
This procedure should be carried out every block.
@ -664,18 +679,14 @@ In addition, validators with `status == PENALIZED` lose `B // reward_quotient +
For each `SpecialRecord` `obj` in `active_state.pending_specials`:
* **[covers logouts]**: If `obj.kind == LOGOUT`, interpret `data[0]` as a validator index as an `int32` and `data[1]` as a signature. If `BLSVerify(pubkey=validators[data[0]].pubkey, msg=hash(LOGOUT_MESSAGE), sig=data[1])`, and `validators[i].status == ACTIVE`, set `validators[i].status = PENDING_EXIT` and `validators[i].exit_slot = current_slot`
* **[covers `NO_DBL_VOTE`, `NO_SURROUND`, `NO_DBL_PROPOSE` slashing conditions]:** If `obj.kind == CASPER_SLASHING`, interpret `data[0]` as a list of concatenated `int32` values where each value represents an index into `validators`, `data[1]` as the data being signed and `data[2]` as an aggregate signature. Interpret `data[3:6]` similarly. Verify that both signatures are valid, that the two signatures are signing distinct data, and that they are either signing the same slot number, or that one surrounds the other (ie. `source1 < source2 < target2 < target1`). Let `indices` be the list of indices in both signatures; verify that its length is at least 1. For each validator index `v` in `indices`, if its `status` does not equal `PENALIZED`, then:
1. Set its `exit_slot` to equal the current `slot`
2. Set its `status` to `PENALIZED`
3. Set `crystallized_state.deposits_penalized_in_period[slot // WITHDRAWAL_PERIOD] += validators[v].balance`, extending the array if needed
4. Run `add_validator_set_change_record(crystallized_state, v, validators[v].pubkey, EXIT)`
* **[covers logouts]**: If `obj.kind == LOGOUT`, interpret `data[0]` as a validator index as an `int32` and `data[1]` as a signature. If `BLSVerify(pubkey=validators[data[0]].pubkey, msg=hash(LOGOUT_MESSAGE), sig=data[1])`, and `validators[i].status == ACTIVE`, run `exit_validator(data[0], crystallized_state, penalize=False, current_slot=current_slot)`
* **[covers `NO_DBL_VOTE`, `NO_SURROUND`, `NO_DBL_PROPOSE` slashing conditions]:** If `obj.kind == CASPER_SLASHING`, interpret `data[0]` as a list of concatenated `int32` values where each value represents an index into `validators`, `data[1]` as the data being signed and `data[2]` as an aggregate signature. Interpret `data[3:6]` similarly. Verify that both signatures are valid, that the two signatures are signing distinct data, and that they are either signing the same slot number, or that one surrounds the other (ie. `source1 < source2 < target2 < target1`). Let `indices` be the list of indices in both signatures; verify that its length is at least 1. For each validator index `v` in `indices`, if its `status` does not equal `PENALIZED`, then run `exit_validator(v, crystallized_state, penalize=True, current_slot=current_slot)`
* **[covers RANDAO updates]**: If `obj.kind == RANDAO_REVEAL`, interpret `data[0]` as an integer and `data[1]` as a hash32. Set `validators[data[0]].randao_commitment = data[1]`.
#### Finally...
* If the balance of any validator with index `v` is less than `MIN_ONLINE_DEPOSIT_SIZE`, then run `exit_validator(v, crystallized_state, penalize=False, current_slot=current_slot)`
* Set `crystallized_state.last_state_recalculation_slot += CYCLE_LENGTH`
* Remove all attestation records older than slot `crystallized_state.last_state_recalculation_slot`
* Empty the `active_state.pending_specials` list