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Bring more clarity to notify_forkchoice_updated calls

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Mikhail Kalinin 2021-11-24 20:32:27 +06:00
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specs/merge/fork-choice.md
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@ -66,6 +66,10 @@ def notify_forkchoice_updated(self: ExecutionEngine,
*Note*: The call of the `notify_forkchoice_updated` function maps on the `POS_FORKCHOICE_UPDATED` event defined in the [EIP-3675](https://eips.ethereum.org/EIPS/eip-3675#definitions).
As per EIP-3675, before a post-transition block is finalized, `notify_forkchoice_updated` must be called with `finalized_block_hash = Hash32()`.
*Note*: Client software must not call this function as long as the paylod of the head of the chain is empty, i.e. `get_head(store).body.payload == ExecutionPayload()`.
*Note*: Client software must call this function to initiate payload build process to produce the merge transition block, in this case the `head_block_hash` parameter must be set to the hash of a terminal PoW block.
## Helpers
### `PayloadAttributes`