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Fair proposer sampling 

I think we want `first_committee[epoch % len(first_committee)]` as opposed to `first_committee[slot % len(first_committee)]`. The reason is that if the shuffling happens infrequently and `len(first_committee)` is a multiple of `SLOTS_PER_EPOCH` then the proposers will not be sampled fairly.

Taking this logic further, we may want to avoiding always picking the proposer from `first_committee`, e.g.:

```
    validators_at_slot = []
    for crosslink_committee, _ in get_crosslink_committees_at_slot(state, slot, registry_change):
        validators_at_slot.append(crosslink_committee)

    return validators_at_slot[epoch % len(validators_at_slot)]
```
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Justin 2019-03-07 23:56:03 +01:00 committed by GitHub
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specs/core/0_beacon-chain.md
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@ -1002,7 +1002,7 @@ def get_beacon_proposer_index(state: BeaconState,
assert previous_epoch <= epoch <= next_epoch
first_committee, _ = get_crosslink_committees_at_slot(state, slot, registry_change)[0]
return first_committee[slot % len(first_committee)]
return first_committee[epoch % len(first_committee)]
```
### `merkle_root`