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add note about attestations on chain voting for justified

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Danny Ryan 2019-02-12 13:08:17 -08:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -1779,7 +1779,7 @@ The steps below happen when `(state.slot + 1) % EPOCH_LENGTH == 0`.
[Validators](#dfn-Validator) attesting during the current epoch:
* Let `current_total_balance = get_total_balance(state, get_active_validator_indices(state.validator_registry, current_epoch))`.
* Let `current_epoch_attestations = [a for a in state.latest_attestations if current_epoch == slot_to_epoch(a.data.slot)]`. (Note: this is the set of attestations of slots in the epoch `current_epoch`, _not_ attestations that got included in the chain during the epoch `current_epoch`.)
* Let `current_epoch_attestations = [a for a in state.latest_attestations if current_epoch == slot_to_epoch(a.data.slot)]`. (Note: Each of these attestations votes for the current justified epoch/block root because of the [attestation block validity rules](#attestations-1).)
* Validators justifying the epoch boundary block at the start of the current epoch:
* Let `current_epoch_boundary_attestations = [a for a in current_epoch_attestations if a.data.epoch_boundary_root == get_block_root(state, get_epoch_start_slot(current_epoch))]`.
* Let `current_epoch_boundary_attester_indices` be the union of the [validator](#dfn-validator) index sets given by `[get_attestation_participants(state, a.data, a.aggregation_bitfield) for a in current_epoch_boundary_attestations]`.
@ -1789,7 +1789,7 @@ The steps below happen when `(state.slot + 1) % EPOCH_LENGTH == 0`.
* Let `previous_total_balance = get_total_balance(state, get_active_validator_indices(state.validator_registry, previous_epoch))`.
* Validators that made an attestation during the previous epoch, targeting the previous justified slot:
* Let `previous_epoch_attestations = [a for a in state.latest_attestations if previous_epoch == slot_to_epoch(a.data.slot)]`.
* Let `previous_epoch_attestations = [a for a in state.latest_attestations if previous_epoch == slot_to_epoch(a.data.slot)]`. (Note: Each of these attestations votes for the previous justified epoch/block root because of the [attestation block validity rules](#attestations-1).)
* Let `previous_epoch_attester_indices` be the union of the validator index sets given by `[get_attestation_participants(state, a.data, a.aggregation_bitfield) for a in previous_epoch_attestations]`.
* Let `previous_epoch_attesting_balance = get_total_balance(state, previous_epoch_attester_indices)`.
* Validators justifying the epoch boundary block at the start of the previous epoch: