Justin 33a05109ea 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)]
```

2019-03-07 23:56:03 +01:00

..

0_beacon-chain.md

Fair proposer sampling

2019-03-07 23:56:03 +01:00

1_shard-data-chains.md

Proof of custody game, take 2 (#682)

2019-03-02 20:36:04 -06:00