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ensure min_seed_lookahead functions properly

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Danny Ryan 2019-07-14 16:05:51 -06:00
parent 9401383317
commit 8970b71ca4
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specs/core/0_beacon-chain.md
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@ -865,7 +865,7 @@ def get_seed(state: BeaconState, epoch: Epoch) -> Hash:
"""
Return the seed at ``epoch``.
"""
mix = get_randao_mix(state, Epoch(epoch + EPOCHS_PER_HISTORICAL_VECTOR - MIN_SEED_LOOKAHEAD)) # Avoid underflow
mix = get_randao_mix(state, Epoch(epoch + EPOCHS_PER_HISTORICAL_VECTOR - MIN_SEED_LOOKAHEAD - 1)) # Avoid underflow
active_index_root = state.active_index_roots[epoch % EPOCHS_PER_HISTORICAL_VECTOR]
return hash(mix + active_index_root + int_to_bytes(epoch, length=32))
```