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eth2.0-specs/specs/_features/eip6914/fork-choice.md

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Update the equivocating indices in the store Since we sometimes reuse the slashed validator index, we need to remove it from the list of equivocating indices in the fork-choice store.
2023-07-11 08:47:17 +00:00
# EIP-6914 -- Fork Choice
## Table of contents
<!-- TOC -->
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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- [Introduction](#introduction)
- [Fork choice](#fork-choice)
- [Handlers](#handlers)
- [`on_reused_index`](#on_reused_index)
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## Introduction
This is the modification of the fork choice according to EIP-6914.
## Fork choice
A new handler is added with this upgrade:
Explain more on on_reused_index
2023-07-18 12:55:18 +00:00
- `on_reused_index(store, index)` whenever a validator index `index: ValidatorIndex` is reused. That is, [`get_index_for_new_validator()`](./beacon-chain.md#get_index_for_new_validator) provides an index due to a return value of `True` from [`is_reusable_validator()`](./beacon-chain.md#is_reusable_validator).
Update the equivocating indices in the store Since we sometimes reuse the slashed validator index, we need to remove it from the list of equivocating indices in the fork-choice store.
2023-07-11 08:47:17 +00:00
This new handler is used to update the list of equivocating indices to be synchronized with the canonical chain.
### Handlers
#### `on_reused_index`
```python
def on_reused_index(store: Store, index: ValidatorIndex) -> None:
store.equivocating_indices.discard(index)
```