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upate validator guide to new crosslink format

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Danny Ryan 2019-04-13 18:02:12 +10:00
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specs/validator/0_beacon-chain-validator.md
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@ -38,13 +38,13 @@ __NOTICE__: This document is a work-in-progress for researchers and implementers
- [Attestations](#attestations-1) - [Attestations](#attestations-1)
- [Attestation data](#attestation-data) - [Attestation data](#attestation-data)
- [Slot](#slot-1) - [Slot](#slot-1)
- [Shard](#shard)
- [Beacon block root](#beacon-block-root) - [Beacon block root](#beacon-block-root)
- [Target root](#target-root)
- [Crosslink data root](#crosslink-data-root)
- [Latest crosslink](#latest-crosslink)
- [Source epoch](#source-epoch) - [Source epoch](#source-epoch)
- [Source root](#source-root) - [Source root](#source-root)
- [Target root](#target-root)
- [Shard](#shard)
- [Previous crosslink root](#previous-crosslink-root)
- [Crosslink data root](#crosslink-data-root)
- [Construct attestation](#construct-attestation) - [Construct attestation](#construct-attestation)
- [Data](#data) - [Data](#data)
- [Aggregation bitfield](#aggregation-bitfield) - [Aggregation bitfield](#aggregation-bitfield)
@ -250,14 +250,18 @@ First the validator should construct `attestation_data`, an [`AttestationData`](
Set `attestation_data.slot = head_state.slot`. Set `attestation_data.slot = head_state.slot`.
##### Shard
Set `attestation_data.shard = shard` where `shard` is the shard associated with the validator's committee defined by `get_crosslink_committees_at_slot`.
##### Beacon block root ##### Beacon block root
Set `attestation_data.beacon_block_root = signing_root(head_block)`. Set `attestation_data.beacon_block_root = signing_root(head_block)`.
##### Source epoch
Set `attestation_data.source_epoch = head_state.justified_epoch`.
##### Source root
Set `attestation_data.source_root = head_state.current_justified_root`.
##### Target root ##### Target root
Set `attestation_data.target_root = signing_root(epoch_boundary)` where `epoch_boundary` is the block at the most recent epoch boundary. Set `attestation_data.target_root = signing_root(epoch_boundary)` where `epoch_boundary` is the block at the most recent epoch boundary.
@ -266,24 +270,20 @@ _Note:_ This can be looked up in the state using:
* Let `epoch_start_slot = get_epoch_start_slot(get_current_epoch(head_state))`. * Let `epoch_start_slot = get_epoch_start_slot(get_current_epoch(head_state))`.
* Set `epoch_boundary = head if epoch_start_slot == head_state.slot else get_block_root(state, epoch_start_slot)`. * Set `epoch_boundary = head if epoch_start_slot == head_state.slot else get_block_root(state, epoch_start_slot)`.
##### Shard
Set `attestation_data.shard = shard` where `shard` is the shard associated with the validator's committee defined by `get_crosslink_committees_at_slot`.
##### Previous crosslink root
Set `attestation_data.previous_crosslink_root = hash_tree_root(head_state.current_crosslinks[shard])`.
##### Crosslink data root ##### Crosslink data root
Set `attestation_data.crosslink_data_root = ZERO_HASH`. Set `attestation_data.crosslink_data_root = ZERO_HASH`.
_Note:_ This is a stub for phase 0. _Note:_ This is a stub for phase 0.
##### Latest crosslink
Set `attestation_data.previous_crosslink = head_state.latest_crosslinks[shard]`.
##### Source epoch
Set `attestation_data.source_epoch = head_state.justified_epoch`.
##### Source root
Set `attestation_data.source_root = head_state.current_justified_root`.
#### Construct attestation #### Construct attestation
Next the validator creates `attestation`, an [`Attestation`](../core/0_beacon-chain.md#attestation) object. Next the validator creates `attestation`, an [`Attestation`](../core/0_beacon-chain.md#attestation) object.