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Changed name to crosslink data commitment

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vbuterin 2019-02-22 00:21:56 -06:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -363,7 +363,7 @@ The following data structures are defined as [SimpleSerialize (SSZ)](https://git
# Root of the ancestor at the epoch boundary
'epoch_boundary_root': 'bytes32',
# Data from the shard since the last attestation
'shard_data_commitment': 'bytes32',
'crosslink_data_root': 'bytes32',
# Last crosslink
'latest_crosslink': Crosslink,
# Last justified epoch in the beacon state
@ -584,8 +584,8 @@ The following data structures are defined as [SimpleSerialize (SSZ)](https://git
{
# Epoch number
'epoch': 'uint64',
# Shard block root
'shard_data_commitment': 'bytes32',
# Shard data since the previous crosslink
'crosslink_data_root': 'bytes32',
}
```
@ -1475,7 +1475,7 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
finalized_epoch=GENESIS_EPOCH,
# Recent state
latest_crosslinks=[Crosslink(epoch=GENESIS_EPOCH, shard_data_commitment=ZERO_HASH) for _ in range(SHARD_COUNT)],
latest_crosslinks=[Crosslink(epoch=GENESIS_EPOCH, crosslink_data_root=ZERO_HASH) for _ in range(SHARD_COUNT)],
latest_block_roots=[ZERO_HASH for _ in range(LATEST_BLOCK_ROOTS_LENGTH)],
latest_active_index_roots=[ZERO_HASH for _ in range(LATEST_ACTIVE_INDEX_ROOTS_LENGTH)],
latest_slashed_balances=[0 for _ in range(LATEST_SLASHED_EXIT_LENGTH)],
@ -1674,7 +1674,7 @@ For each `attestation` in `block.body.attestations`:
* Verify that `attestation.data.slot <= state.slot - MIN_ATTESTATION_INCLUSION_DELAY < attestation.data.slot + SLOTS_PER_EPOCH`.
* Verify that `attestation.data.justified_epoch` is equal to `state.justified_epoch if slot_to_epoch(attestation.data.slot + 1) >= get_current_epoch(state) else state.previous_justified_epoch`.
* Verify that `attestation.data.justified_block_root` is equal to `get_block_root(state, get_epoch_start_slot(attestation.data.justified_epoch))`.
* Verify that either (i) `state.latest_crosslinks[attestation.data.shard] == attestation.data.latest_crosslink` or (ii) `state.latest_crosslinks[attestation.data.shard] == Crosslink(shard_data_commitment=attestation.data.shard_data_commitment, epoch=slot_to_epoch(attestation.data.slot))`.
* Verify that either (i) `state.latest_crosslinks[attestation.data.shard] == attestation.data.latest_crosslink` or (ii) `state.latest_crosslinks[attestation.data.shard] == Crosslink(crosslink_data_root=attestation.data.crosslink_data_root, epoch=slot_to_epoch(attestation.data.slot))`.
* Verify bitfields and aggregate signature:
```python
@ -1707,7 +1707,7 @@ For each `attestation` in `block.body.attestations`:
)
```
* [TO BE REMOVED IN PHASE 1] Verify that `attestation.data.shard_data_commitment == ZERO_HASH`.
* [TO BE REMOVED IN PHASE 1] Verify that `attestation.data.crosslink_data_root == ZERO_HASH`.
* Append `PendingAttestation(data=attestation.data, aggregation_bitfield=attestation.aggregation_bitfield, custody_bitfield=attestation.custody_bitfield, inclusion_slot=state.slot)` to `state.latest_attestations`.
##### Deposits
@ -1815,10 +1815,10 @@ The steps below happen when `(state.slot + 1) % SLOTS_PER_EPOCH == 0`.
For every `slot in range(get_epoch_start_slot(previous_epoch), get_epoch_start_slot(next_epoch))`, let `crosslink_committees_at_slot = get_crosslink_committees_at_slot(state, slot)`. For every `(crosslink_committee, shard)` in `crosslink_committees_at_slot`, compute:
* Let `shard_data_commitment` be `state.latest_crosslinks[shard].shard_data_commitment`
* Let `attesting_validator_indices(crosslink_committee, shard_data_commitment)` 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_attestations + previous_epoch_attestations if a.data.shard == shard and a.data.shard_data_commitment == shard_data_commitment]`.
* Let `winning_data_commitment(crosslink_committee)` be equal to the value of `shard_data_commitment` such that `get_total_balance(state, attesting_validator_indices(crosslink_committee, shard_data_commitment))` is maximized (ties broken by favoring lower `shard_data_commitment` values).
* Let `attesting_validators(crosslink_committee)` be equal to `attesting_validator_indices(crosslink_committee, winning_data_commitment(crosslink_committee))` for convenience.
* Let `crosslink_data_root` be `state.latest_crosslinks[shard].crosslink_data_root`
* Let `attesting_validator_indices(crosslink_committee, crosslink_data_root)` 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_attestations + previous_epoch_attestations if a.data.shard == shard and a.data.crosslink_data_root == crosslink_data_root]`.
* Let `winning_root(crosslink_committee)` be equal to the value of `crosslink_data_root` such that `get_total_balance(state, attesting_validator_indices(crosslink_committee, crosslink_data_root))` is maximized (ties broken by favoring lower `crosslink_data_root` values).
* Let `attesting_validators(crosslink_committee)` be equal to `attesting_validator_indices(crosslink_committee, winning_root(crosslink_committee))` for convenience.
* Let `total_attesting_balance(crosslink_committee) = get_total_balance(state, attesting_validators(crosslink_committee))`.
Define the following helpers to process attestation inclusion rewards and inclusion distance reward/penalty. For every attestation `a` in `previous_epoch_attestations`:
@ -1858,7 +1858,7 @@ Finally, update the following:
For every `slot in range(get_epoch_start_slot(previous_epoch), get_epoch_start_slot(next_epoch))`, let `crosslink_committees_at_slot = get_crosslink_committees_at_slot(state, slot)`. For every `(crosslink_committee, shard)` in `crosslink_committees_at_slot`, compute:
* Set `state.latest_crosslinks[shard] = Crosslink(epoch=slot_to_epoch(slot), shard_data_commitment=winning_data_commitment(crosslink_committee))` if `3 * total_attesting_balance(crosslink_committee) >= 2 * get_total_balance(crosslink_committee)`.
* Set `state.latest_crosslinks[shard] = Crosslink(epoch=slot_to_epoch(slot), crosslink_data_root=winning_root(crosslink_committee))` if `3 * total_attesting_balance(crosslink_committee) >= 2 * get_total_balance(crosslink_committee)`.
#### Rewards and penalties