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Merge pull request #1023 from ethereum/ralexstokes-patch-1 

Add notes to compute fork choice at genesis
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Danny Ryan 2019-05-06 09:11:25 -06:00 committed by GitHub
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specs/core/0_fork-choice.md
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@ -13,6 +13,8 @@
- [Time parameters](#time-parameters)
- [Beacon chain processing](#beacon-chain-processing)
- [Beacon chain fork choice rule](#beacon-chain-fork-choice-rule)
- [Implementation notes](#implementation-notes)
- [Justification and finality at genesis](#justification-and-finality-at-genesis)
<!-- /TOC -->
@ -99,3 +101,9 @@ def lmd_ghost(store: Store, start_state: BeaconState, start_block: BeaconBlock)
# Ties broken by favoring block with lexicographically higher root
head = max(children, key=lambda x: (get_vote_count(x), hash_tree_root(x)))
```
## Implementation notes
### Justification and finality at genesis
During genesis, justification and finality root fields within the `BeaconState` reference `ZERO_HASH` rather than a known block. `ZERO_HASH` in `previous_justified_root`, `current_justified_root`, and `finalized_root` should be considered as an alias to the root of the genesis block.