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Merge pull request #1253 from ethereum/v_guide_checkpoint 

Update v-guide wrt recent spec updates
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Danny Ryan 2019-06-30 22:17:10 -05:00 committed by GitHub
parent 2855e43551 200da4de93
commit 70ce7a1009
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1 changed files with 4 additions and 6 deletions
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specs/validator/0_beacon-chain-validator.md
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@ -293,10 +293,8 @@ Set `attestation_data.beacon_block_root = signing_root(head_block)`.
##### FFG vote ##### FFG vote
- Set `attestation_data.source_epoch = head_state.current_justified_epoch`. - Set `attestation_data.source = head_state.current_justified_checkpoint`.
- Set `attestation_data.source_root = head_state.current_justified_root`. - Set `attestation_data.target = Checkpoint(epoch=get_current_epoch(head_state), root=epoch_boundary_block_root)` where `epoch_boundary_block_root` is the root of block at the most recent epoch boundary.
- Set `attestation_data.target_epoch = get_current_epoch(head_state)`
- Set `attestation_data.target_root = epoch_boundary_block_root` where `epoch_boundary_block_root` is the root of block at the most recent epoch boundary.
*Note*: `epoch_boundary_block_root` can be looked up in the state using: *Note*: `epoch_boundary_block_root` can be looked up in the state using:
@ -310,7 +308,7 @@ Construct `attestation_data.crosslink` via the following.
- Set `attestation_data.crosslink.shard = shard` where `shard` is the shard associated with the validator's committee. - Set `attestation_data.crosslink.shard = shard` where `shard` is the shard associated with the validator's committee.
- Let `parent_crosslink = head_state.current_crosslinks[shard]`. - Let `parent_crosslink = head_state.current_crosslinks[shard]`.
- Set `attestation_data.crosslink.start_epoch = parent_crosslink.end_epoch`. - Set `attestation_data.crosslink.start_epoch = parent_crosslink.end_epoch`.
- Set `attestation_data.crosslink.end_epoch = min(attestation_data.target_epoch, parent_crosslink.end_epoch + MAX_EPOCHS_PER_CROSSLINK)`. - Set `attestation_data.crosslink.end_epoch = min(attestation_data.target.epoch, parent_crosslink.end_epoch + MAX_EPOCHS_PER_CROSSLINK)`.
- Set `attestation_data.crosslink.parent_root = hash_tree_root(head_state.current_crosslinks[shard])`. - Set `attestation_data.crosslink.parent_root = hash_tree_root(head_state.current_crosslinks[shard])`.
- Set `attestation_data.crosslink.data_root = ZERO_HASH`. *Note*: This is a stub for Phase 0. - Set `attestation_data.crosslink.data_root = ZERO_HASH`. *Note*: This is a stub for Phase 0.
@ -374,7 +372,7 @@ To avoid "attester slashings", a validator must not sign two conflicting [`Attes
Specifically, when signing an `Attestation`, a validator should perform the following steps in the following order: Specifically, when signing an `Attestation`, a validator should perform the following steps in the following order:
1. Save a record to hard disk that an attestation has been signed for source (i.e. `attestation_data.source_epoch`) and target (i.e. `compute_epoch_of_slot(attestation_data.slot)`). 1. Save a record to hard disk that an attestation has been signed for source (i.e. `attestation_data.source.epoch`) and target (i.e. `attestation_data.target.epoch`).
2. Generate and broadcast attestation. 2. Generate and broadcast attestation.
If the software crashes at some point within this routine, then when the validator comes back online, the hard disk has the record of the *potentially* signed/broadcast attestation and can effectively avoid slashing. If the software crashes at some point within this routine, then when the validator comes back online, the hard disk has the record of the *potentially* signed/broadcast attestation and can effectively avoid slashing.