status-im
/
eth2.0-specs
mirror of https://github.com/status-im/eth2.0-specs.git
2
0
Fork 0
Code Issues Projects Releases Wiki Activity

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

Add notes to compute fork choice at genesis
This commit is contained in:
Danny Ryan 2019-05-06 09:11:25 -06:00 committed by GitHub
parent ef90e23dda 7d0a6191ed
commit 148f18c5fd
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
specs/core/0_fork-choice.md
View File

@ -13,6 +13,8 @@
- [Time parameters](#time-parameters) - [Time parameters](#time-parameters)
- [Beacon chain processing](#beacon-chain-processing) - [Beacon chain processing](#beacon-chain-processing)
- [Beacon chain fork choice rule](#beacon-chain-fork-choice-rule) - [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 --> <!-- /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 # Ties broken by favoring block with lexicographically higher root
head = max(children, key=lambda x: (get_vote_count(x), hash_tree_root(x))) 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.