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Merge pull request #1297 from ethereum/zero-hash-check 

make zero hash representation clear, fixes #1282
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Danny Ryan 2019-07-14 18:11:03 -06:00 committed by GitHub
parent 77f007cab5 ef659144b4
commit 723e956a3e
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1 changed files with 4 additions and 3 deletions
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7
specs/core/0_beacon-chain.md
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@ -1216,7 +1216,7 @@ def process_slot(state: BeaconState) -> None:
previous_state_root = hash_tree_root(state) previous_state_root = hash_tree_root(state)
state.state_roots[state.slot % SLOTS_PER_HISTORICAL_ROOT] = previous_state_root state.state_roots[state.slot % SLOTS_PER_HISTORICAL_ROOT] = previous_state_root
# Cache latest block header state root # Cache latest block header state root
if state.latest_block_header.state_root == Hash(): if state.latest_block_header.state_root == Bytes32():
state.latest_block_header.state_root = previous_state_root state.latest_block_header.state_root = previous_state_root
# Cache block root # Cache block root
previous_block_root = signing_root(state.latest_block_header) previous_block_root = signing_root(state.latest_block_header)
@ -1548,8 +1548,9 @@ def process_block_header(state: BeaconState, block: BeaconBlock) -> None:
state.latest_block_header = BeaconBlockHeader( state.latest_block_header = BeaconBlockHeader(
slot=block.slot, slot=block.slot,
parent_root=block.parent_root, parent_root=block.parent_root,
state_root=Hash(), # Overwritten in the next `process_slot` call # state_root: zeroed, overwritten in the next `process_slot` call
body_root=hash_tree_root(block.body), body_root=hash_tree_root(block.body),
# signature is always zeroed
) )
# Verify proposer is not slashed # Verify proposer is not slashed
proposer = state.validators[get_beacon_proposer_index(state)] proposer = state.validators[get_beacon_proposer_index(state)]
@ -1672,7 +1673,7 @@ def process_attestation(state: BeaconState, attestation: Attestation) -> None:
assert data.crosslink.parent_root == hash_tree_root(parent_crosslink) assert data.crosslink.parent_root == hash_tree_root(parent_crosslink)
assert data.crosslink.start_epoch == parent_crosslink.end_epoch 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.end_epoch == min(data.target.epoch, parent_crosslink.end_epoch + MAX_EPOCHS_PER_CROSSLINK)
assert data.crosslink.data_root == Hash() # [to be removed in phase 1] assert data.crosslink.data_root == Bytes32() # [to be removed in phase 1]
# Check signature # Check signature
assert is_valid_indexed_attestation(state, get_indexed_attestation(state, attestation)) assert is_valid_indexed_attestation(state, get_indexed_attestation(state, attestation))