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Paul Hauner 2021-12-20 18:32:47 +11:00
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@ -43,7 +43,7 @@ def latest_valid_ancestor(block: BeaconBlock) -> BeaconBlock:
```python ```python
def is_execution_block(block: BeaconBlock) -> BeaconBlock: def is_execution_block(block: BeaconBlock) -> BeaconBlock:
block.execution_payload != ExecutionPayload() block.body.execution_payload != ExecutionPayload()
``` ```
```python ```python
@ -110,7 +110,7 @@ When a block transitions from the `SYNCING` state it is removed from the set of
### Execution Engine Errors ### Execution Engine Errors
When an execution engine returns an error or fails to respond to a payload When an execution engine returns an error or fails to respond to a payload
validity request some block, a consensus engine: validity request for some block, a consensus engine:
- MUST NOT optimistically import the block. - MUST NOT optimistically import the block.
- MUST NOT apply the block to the fork choice store. - MUST NOT apply the block to the fork choice store.
@ -155,9 +155,10 @@ head (due to the invalid chain of payloads) and the node is unable to produce a
block that forks around the head (due to the justification of the malicious block that forks around the head (due to the justification of the malicious
chain). chain).
The fork choice poisoning attack is temporary for an individual node when that If honest chain exists which justifies a higher epoch than the malicious chain,
an honest chain exists which justifies a higher epoch than the malicious chain. that chain will take precedence and revive any poisoned store. Therefore, the
Such an honest chain will take precedence and revive any poisoned store. poisoning attack is temporary if >= 2/3rds of the network is honest and
non-faulty.
The `SAFE_SLOTS_TO_IMPORT_OPTIMISTICALLY` parameter assumes that the network The `SAFE_SLOTS_TO_IMPORT_OPTIMISTICALLY` parameter assumes that the network
will justify a honest chain within some number of slots. With this assumption, will justify a honest chain within some number of slots. With this assumption,