3.1 KiB

Raw Blame History

EIP-7251 -- Honest Validator

Introduction
Prerequisites
Beacon chain responsibilities
- Block and sidecar proposal
  - Constructing the BeaconBlockBody
    - ExecutionPayload

Introduction

This document represents the changes to be made in the code of an "honest validator".

Prerequisites

This document is an extension of the Deneb -- Honest Validator guide. All behaviors and definitions defined in this document, and documents it extends, carry over unless explicitly noted or overridden.

All terminology, constants, functions, and protocol mechanics defined in the updated Beacon Chain doc of EIP-7251 are requisite for this document and used throughout. Please see related Beacon Chain doc before continuing and use them as a reference throughout.

Beacon chain responsibilities

All validator responsibilities remain unchanged other than those noted below.

Block and sidecar proposal

Constructing the `BeaconBlockBody`

ExecutionPayload

prepare_execution_payload is updated from the Deneb specs.

Note: In this section, state is the state of the slot for the block proposal without the block yet applied. That is, state is the previous_state processed through any empty slots up to the assigned slot using process_slots(previous_state, slot).

Note: The only change to prepare_execution_payload is the new definition of get_expected_withdrawals.

def prepare_execution_payload(state: BeaconState,
                              safe_block_hash: Hash32,
                              finalized_block_hash: Hash32,
                              suggested_fee_recipient: ExecutionAddress,
                              execution_engine: ExecutionEngine) -> Optional[PayloadId]:
    # Verify consistency of the parent hash with respect to the previous execution payload header
    parent_hash = state.latest_execution_payload_header.block_hash

    # Set the forkchoice head and initiate the payload build process
    withdrawals, _ = get_expected_withdrawals(state)  # [Modified in EIP-7251]

    payload_attributes = PayloadAttributes(
        timestamp=compute_timestamp_at_slot(state, state.slot),
        prev_randao=get_randao_mix(state, get_current_epoch(state)),
        suggested_fee_recipient=suggested_fee_recipient,
        withdrawals=withdrawals,
        parent_beacon_block_root=hash_tree_root(state.latest_block_header),
    )
    return execution_engine.notify_forkchoice_updated(
        head_block_hash=parent_hash,
        safe_block_hash=safe_block_hash,
        finalized_block_hash=finalized_block_hash,
        payload_attributes=payload_attributes,
    )

3.1 KiB Raw Blame History