74 lines
3.1 KiB
Markdown
74 lines
3.1 KiB
Markdown
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# EIP-7251 -- Honest Validator
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## Table of contents
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<!-- TOC -->
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<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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- [Introduction](#introduction)
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- [Prerequisites](#prerequisites)
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- [Beacon chain responsibilities](#beacon-chain-responsibilities)
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- [Block and sidecar proposal](#block-and-sidecar-proposal)
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- [Constructing the `BeaconBlockBody`](#constructing-the-beaconblockbody)
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- [ExecutionPayload](#executionpayload)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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<!-- /TOC -->
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## Introduction
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This document represents the changes to be made in the code of an "honest validator".
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## Prerequisites
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This document is an extension of the [Deneb -- Honest Validator](../deneb/validator.md) guide.
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All behaviors and definitions defined in this document, and documents it extends, carry over unless explicitly noted or overridden.
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All terminology, constants, functions, and protocol mechanics defined in the updated [Beacon Chain doc of EIP-7251](./beacon-chain.md) are requisite for this document and used throughout.
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Please see related Beacon Chain doc before continuing and use them as a reference throughout.
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## Beacon chain responsibilities
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All validator responsibilities remain unchanged other than those noted below.
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### Block and sidecar proposal
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#### Constructing the `BeaconBlockBody`
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##### ExecutionPayload
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`prepare_execution_payload` is updated from the Deneb specs.
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*Note*: In this section, `state` is the state of the slot for the block proposal _without_ the block yet applied.
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That is, `state` is the `previous_state` processed through any empty slots up to the assigned slot using `process_slots(previous_state, slot)`.
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*Note*: The only change to `prepare_execution_payload` is the new definition of `get_expected_withdrawals`.
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```python
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def prepare_execution_payload(state: BeaconState,
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safe_block_hash: Hash32,
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finalized_block_hash: Hash32,
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suggested_fee_recipient: ExecutionAddress,
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execution_engine: ExecutionEngine) -> Optional[PayloadId]:
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# Verify consistency of the parent hash with respect to the previous execution payload header
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parent_hash = state.latest_execution_payload_header.block_hash
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# Set the forkchoice head and initiate the payload build process
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withdrawals, _ = get_expected_withdrawals(state) # [Modified in EIP-7251]
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payload_attributes = PayloadAttributes(
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timestamp=compute_timestamp_at_slot(state, state.slot),
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prev_randao=get_randao_mix(state, get_current_epoch(state)),
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suggested_fee_recipient=suggested_fee_recipient,
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withdrawals=withdrawals,
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parent_beacon_block_root=hash_tree_root(state.latest_block_header),
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)
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return execution_engine.notify_forkchoice_updated(
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head_block_hash=parent_hash,
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safe_block_hash=safe_block_hash,
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finalized_block_hash=finalized_block_hash,
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payload_attributes=payload_attributes,
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)
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```
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