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Crosslinks store start and end epoch 

Solves #1034
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vbuterin 2019-05-19 09:33:01 -04:00 committed by GitHub
parent a6a61bbecb
commit 85c1654456
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1 changed files with 5 additions and 3 deletions
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8
specs/core/0_beacon-chain.md
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@ -281,8 +281,9 @@ The types are defined topologically to aid in facilitating an executable version
{
# Shard number
'shard': 'uint64',
# Epoch number
'epoch': 'uint64',
# Crosslinking data from epochs [start....end-1]
'start_epoch': 'uint64',
'end_epoch': 'uint64',
# Root of the previous crosslink
'parent_root': 'bytes32',
# Root of the crosslinked shard data since the previous crosslink
@ -1728,7 +1729,8 @@ def process_attestation(state: BeaconState, attestation: Attestation) -> None:
# Check FFG data, crosslink data, and signature
assert ffg_data == (data.source_epoch, data.source_root, data.target_epoch)
assert data.crosslink.epoch == min(data.target_epoch, parent_crosslink.epoch + MAX_EPOCHS_PER_CROSSLINK)
assert data.crosslink.start_epoch == parent_crosslink.end_epoch
assert data.crosslink.end_epoch == min(data.target_epoch, parent_crosslink.end_epoch + MAX_EPOCHS_PER_CROSSLINK)
assert data.crosslink.parent_root == hash_tree_root(parent_crosslink)
assert data.crosslink.data_root == ZERO_HASH # [to be removed in phase 1]
validate_indexed_attestation(state, convert_to_indexed(state, attestation))