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Merge pull request #1296 from ethereum/lookahead-fix 

Lookahead fix
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Diederik Loerakker 2019-07-15 01:18:36 +02:00 committed by GitHub
parent 9401383317 8970b71ca4
commit c3435222b9
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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))
```