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Fix #1173 

The bug is that it's possible to include a participating validator which has custody bit one *without* specifying that validator in `attestation.aggregation_bitfield`. In other words, we want to check that every bit in `custody_bitfield` is zero whenever the corresponding bit in `aggregation_bitfield` is zero. Well spotted @protolambda
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Justin 2019-06-13 21:01:10 +01:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -991,6 +991,7 @@ def convert_to_indexed(state: BeaconState, attestation: Attestation) -> IndexedA
"""
attesting_indices = get_attesting_indices(state, attestation.data, attestation.aggregation_bitfield)
custody_bit_1_indices = get_attesting_indices(state, attestation.data, attestation.custody_bitfield)
assert set(custody_bit_1_indices).issubset(attesting_indices)
custody_bit_0_indices = [index for index in attesting_indices if index not in custody_bit_1_indices]
return IndexedAttestation(