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Update 0_beacon-chain.md

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Justin 2019-04-18 11:09:30 +10:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -1575,16 +1575,15 @@ At every `slot > GENESIS_SLOT` run the following function:
```python ```python
def cache_state(state: BeaconState) -> None: def cache_state(state: BeaconState) -> None:
previous_slot_state_root = hash_tree_root(state) # Cache latest known state root (for previous slot)
latest_state_root = hash_tree_root(state)
state.latest_state_roots[state.slot % SLOTS_PER_HISTORICAL_ROOT] = latest_state_root
# store the previous slot's post state transition root # Store latest known state root (for previous slot) in latest_block_header if it is empty
state.latest_state_roots[state.slot % SLOTS_PER_HISTORICAL_ROOT] = previous_slot_state_root
# cache state root in stored latest_block_header if empty
if state.latest_block_header.state_root == ZERO_HASH: if state.latest_block_header.state_root == ZERO_HASH:
state.latest_block_header.state_root = previous_slot_state_root state.latest_block_header.state_root = latest_state_root
# store latest known block for previous slot # Cache latest known block root (for previous slot)
latest_block_root = signing_root(state.latest_block_header) latest_block_root = signing_root(state.latest_block_header)
state.latest_block_roots[state.slot % SLOTS_PER_HISTORICAL_ROOT] = latest_block_root state.latest_block_roots[state.slot % SLOTS_PER_HISTORICAL_ROOT] = latest_block_root
``` ```