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Fair proposer selection probability #772

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merged 5 commits into from Mar 26, 2019
Merged

Fair proposer selection probability #772

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4442dff
Fair proposer selection probability
vbuterin Mar 14, 2019
23d15f5
Update 0_beacon-chain.md
JustinDrake Mar 14, 2019
bbc5139
Update 0_beacon-chain.md
JustinDrake Mar 14, 2019
fcc1c64
Merge branch 'dev' into vbuterin-patch-13
djrtwo Mar 26, 2019
0121ade
fix beacon proposer function and mod v-guide to not have lookahead fo…
djrtwo Mar 26, 2019
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8 changes: 7 additions & 1 deletion specs/core/0_beacon-chain.md
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Expand Up @@ -1015,7 +1015,13 @@ 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[epoch % len(first_committee)]
i = 0
while True:
rand_byte = hash(generate_seed(get_current_epoch(state)) + int_to_bytes8(i // 32))[i % 32]
candidate = first_committee[(epoch + i) % len(first_committee)]
if get_effective_balance(state, candidate) * 256 > MAX_DEPOSIT_AMOUNT * rand_byte:
return candidate
i += 1
```

### `verify_merkle_branch`
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