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Make 'Any active validator' statements stricter. #703

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Mar 1, 2019
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Make 'Any active validator' statements stricter. #703

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15 changes: 7 additions & 8 deletions specs/core/0_beacon-chain.md
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Expand Up @@ -1862,29 +1862,28 @@ Note: When applying penalties in the following balance recalculations implemente

##### Justification and finalization

Note: Rewards and penalties are for participation in the previous epoch, so the "active validator" set is drawn from `get_active_validator_indices(state.validator_registry, previous_epoch)`.

* Let `previous_active_validator_indices = get_active_validator_indices(state.validator_registry, previous_epoch)`
* Let `epochs_since_finality = next_epoch - state.finalized_epoch`.

Case 1: `epochs_since_finality <= 4`:

* Expected FFG source:
* Any [validator](#dfn-validator) `index` in `previous_epoch_attester_indices` gains `base_reward(state, index) * previous_epoch_attesting_balance // previous_total_balance`.
* Any [active validator](#dfn-active-validator) `index` not in `previous_epoch_attester_indices` loses `base_reward(state, index)`.
* Any [active validator](#dfn-active-validator) `index` from `previous_active_validator_indices` not in `previous_epoch_attester_indices` loses `base_reward(state, index)`.
* Expected FFG target:
* Any [validator](#dfn-validator) `index` in `previous_epoch_boundary_attester_indices` gains `base_reward(state, index) * previous_epoch_boundary_attesting_balance // previous_total_balance`.
* Any [active validator](#dfn-active-validator) `index` not in `previous_epoch_boundary_attester_indices` loses `base_reward(state, index)`.
* Any [active validator](#dfn-active-validator) `index` from `previous_active_validator_indices` not in `previous_epoch_boundary_attester_indices` loses `base_reward(state, index)`.
* Expected beacon chain head:
* Any [validator](#dfn-validator) `index` in `previous_epoch_head_attester_indices` gains `base_reward(state, index) * previous_epoch_head_attesting_balance // previous_total_balance)`.
* Any [active validator](#dfn-active-validator) `index` not in `previous_epoch_head_attester_indices` loses `base_reward(state, index)`.
* Any [active validator](#dfn-active-validator) `index` from `previous_active_validator_indices` not in `previous_epoch_head_attester_indices` loses `base_reward(state, index)`.
* Inclusion distance:
* Any [validator](#dfn-validator) `index` in `previous_epoch_attester_indices` gains `base_reward(state, index) * MIN_ATTESTATION_INCLUSION_DELAY // inclusion_distance(state, index)`

Case 2: `epochs_since_finality > 4`:

* Any [active validator](#dfn-active-validator) `index` not in `previous_epoch_attester_indices`, loses `inactivity_penalty(state, index, epochs_since_finality)`.
* Any [active validator](#dfn-active-validator) `index` not in `previous_epoch_boundary_attester_indices`, loses `inactivity_penalty(state, index, epochs_since_finality)`.
* Any [active validator](#dfn-active-validator) `index` not in `previous_epoch_head_attester_indices`, loses `base_reward(state, index)`.
* Any [active validator](#dfn-active-validator) `index` from `previous_active_validator_indices` not in `previous_epoch_attester_indices`, loses `inactivity_penalty(state, index, epochs_since_finality)`.
* Any [active validator](#dfn-active-validator) `index` from `previous_active_validator_indices` not in `previous_epoch_boundary_attester_indices`, loses `inactivity_penalty(state, index, epochs_since_finality)`.
* Any [active validator](#dfn-active-validator) `index` from `previous_active_validator_indices` not in `previous_epoch_head_attester_indices`, loses `base_reward(state, index)`.
* Any [active validator](#dfn-active-validator) `index` with `validator.slashed is True`, loses `2 * inactivity_penalty(state, index, epochs_since_finality) + base_reward(state, index)`.
* Any [validator](#dfn-validator) `index` in `previous_epoch_attester_indices` loses `base_reward(state, index) - base_reward(state, index) * MIN_ATTESTATION_INCLUSION_DELAY // inclusion_distance(state, index)`

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