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EIP-8205 -- Honest Validator

Note: This document is a work-in-progress for researchers and implementers.

Introduction

This document represents the changes to be made in the code of an "honest validator" to implement EIP-8205.

Beacon chain responsibilities

All validator responsibilities remain unchanged other than those noted below.

Block and sidecar proposal

Constructing the BeaconBlockBody

Execution requests

Note: The function get_execution_requests is modified to parse the validator preregistration requests.

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def get_execution_requests(execution_requests_list: Sequence[bytes]) -> ExecutionRequests:
    deposits = DepositRequests()
    withdrawals = WithdrawalRequests()
    consolidations = ConsolidationRequests()
    builder_deposits = BuilderDepositRequests()
    builder_exits = BuilderExitRequests()
    # [New in EIP8205]
    preregistrations = PreregistrationRequests()

    request_types = [
        DEPOSIT_REQUEST_TYPE,
        WITHDRAWAL_REQUEST_TYPE,
        CONSOLIDATION_REQUEST_TYPE,
        BUILDER_DEPOSIT_REQUEST_TYPE,
        BUILDER_EXIT_REQUEST_TYPE,
        # [New in EIP8205]
        PREREGISTRATION_REQUEST_TYPE,
    ]

    prev_request_type = None
    for request in execution_requests_list:
        request_type, request_data = request[0:1], request[1:]

        # Check that the request type is valid
        assert request_type in request_types
        # Check that the request data is not empty
        assert len(request_data) != 0
        # Check that requests are in strictly ascending order
        # Each successive type must be greater than the last with no duplicates
        assert prev_request_type is None or prev_request_type < request_type
        prev_request_type = request_type

        if request_type == DEPOSIT_REQUEST_TYPE:
            deposits = ssz_deserialize(DepositRequests, request_data)
        elif request_type == WITHDRAWAL_REQUEST_TYPE:
            withdrawals = ssz_deserialize(WithdrawalRequests, request_data)
        elif request_type == CONSOLIDATION_REQUEST_TYPE:
            consolidations = ssz_deserialize(ConsolidationRequests, request_data)
        elif request_type == BUILDER_DEPOSIT_REQUEST_TYPE:
            builder_deposits = ssz_deserialize(BuilderDepositRequests, request_data)
        elif request_type == BUILDER_EXIT_REQUEST_TYPE:
            builder_exits = ssz_deserialize(BuilderExitRequests, request_data)
        # [New in EIP8205]
        elif request_type == PREREGISTRATION_REQUEST_TYPE:
            preregistrations = ssz_deserialize(PreregistrationRequests, request_data)

    return ExecutionRequests(
        deposits=deposits,
        withdrawals=withdrawals,
        consolidations=consolidations,
        builder_deposits=builder_deposits,
        builder_exits=builder_exits,
        # [New in EIP8205]
        preregistrations=preregistrations,
    )