49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
# Ethereum 2.0 Phase 1 -- Beacon Chain Fork Choice
|
|
|
|
**Notice**: This document is a work-in-progress for researchers and implementers.
|
|
|
|
## Table of contents
|
|
<!-- TOC -->
|
|
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
|
|
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
|
|
|
|
|
|
- [Introduction](#introduction)
|
|
- [Helpers](#helpers)
|
|
- [Extended `LatestMessage`](#extended-latestmessage)
|
|
- [Updated `update_latest_messages`](#updated-update_latest_messages)
|
|
|
|
<!-- END doctoc generated TOC please keep comment here to allow auto update -->
|
|
<!-- /TOC -->
|
|
|
|
## Introduction
|
|
|
|
This document is the beacon chain fork choice spec for part of Ethereum 2.0 Phase 1.
|
|
|
|
### Helpers
|
|
|
|
#### Extended `LatestMessage`
|
|
|
|
```python
|
|
@dataclass(eq=True, frozen=True)
|
|
class LatestMessage(object):
|
|
epoch: Epoch
|
|
root: Root
|
|
shard: Shard
|
|
shard_root: Root
|
|
```
|
|
|
|
#### Updated `update_latest_messages`
|
|
|
|
```python
|
|
def update_latest_messages(store: Store, attesting_indices: Sequence[ValidatorIndex], attestation: Attestation) -> None:
|
|
target = attestation.data.target
|
|
beacon_block_root = attestation.data.beacon_block_root
|
|
shard = get_shard(store.block_states[beacon_block_root], attestation)
|
|
for i in attesting_indices:
|
|
if i not in store.latest_messages or target.epoch > store.latest_messages[i].epoch:
|
|
store.latest_messages[i] = LatestMessage(
|
|
epoch=target.epoch, root=beacon_block_root, shard=shard, shard_root=attestation.data.shard_head_root
|
|
)
|
|
```
|