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EIP-8205 -- Fork Logic

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

Introduction

This document describes the process of the EIP-8205 upgrade.

Configs

Warning: this configuration is not definitive.

Name Value
EIP8205_FORK_VERSION Version("0xe8205000")
EIP8205_FORK_EPOCH Epoch(18446744073709551615) TBD

Fork to EIP-8205

If state.slot % SLOTS_PER_EPOCH == 0 and compute_epoch_at_slot(state.slot) == EIP8205_FORK_EPOCH, an irregular state change is made to upgrade to EIP-8205.

The upgrade occurs after the completion of the inner loop of process_slots that sets state.slot equal to EIP8205_FORK_EPOCH * SLOTS_PER_EPOCH.

The empty list is correct for a standalone activation: no historical execution layer request can pre-populate the new field.

Note: latest_execution_payload_bid is copied unchanged. Its execution_requests_root may commit to the pre-fork ExecutionRequests type, whose root differs from the extended type even for identical content; the upgrade cannot recompute it because the state stores only the commitment. The coordinated upgrade that activates this feature must define how the first post-fork block validates a full pre-fork parent.

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def upgrade_to_eip8205(pre: heze.BeaconState) -> BeaconState:
    epoch = heze.get_current_epoch(pre)
    post = BeaconState(
        genesis_time=pre.genesis_time,
        genesis_validators_root=pre.genesis_validators_root,
        slot=pre.slot,
        fork=Fork(
            previous_version=pre.fork.current_version,
            # [New in EIP8205]
            current_version=EIP8205_FORK_VERSION,
            epoch=epoch,
        ),
        latest_block_header=pre.latest_block_header,
        block_roots=pre.block_roots,
        state_roots=pre.state_roots,
        historical_roots=pre.historical_roots,
        validators=pre.validators,
        balances=pre.balances,
        randao_mixes=pre.randao_mixes,
        slashings=pre.slashings,
        previous_epoch_participation=pre.previous_epoch_participation,
        current_epoch_participation=pre.current_epoch_participation,
        justification_bits=pre.justification_bits,
        previous_justified_checkpoint=pre.previous_justified_checkpoint,
        current_justified_checkpoint=pre.current_justified_checkpoint,
        finalized_checkpoint=pre.finalized_checkpoint,
        inactivity_scores=pre.inactivity_scores,
        current_sync_committee=pre.current_sync_committee,
        next_sync_committee=pre.next_sync_committee,
        latest_block_hash=pre.latest_block_hash,
        next_withdrawal_index=pre.next_withdrawal_index,
        next_withdrawal_validator_index=pre.next_withdrawal_validator_index,
        historical_summaries=pre.historical_summaries,
        deposit_balance_to_consume=pre.deposit_balance_to_consume,
        exit_balance_to_consume=pre.exit_balance_to_consume,
        earliest_exit_epoch=pre.earliest_exit_epoch,
        consolidation_balance_to_consume=pre.consolidation_balance_to_consume,
        earliest_consolidation_epoch=pre.earliest_consolidation_epoch,
        pending_deposits=pre.pending_deposits,
        pending_partial_withdrawals=pre.pending_partial_withdrawals,
        pending_consolidations=pre.pending_consolidations,
        proposer_lookahead=pre.proposer_lookahead,
        builders=pre.builders,
        next_withdrawal_builder_index=pre.next_withdrawal_builder_index,
        execution_payload_availability=pre.execution_payload_availability,
        builder_pending_payments=pre.builder_pending_payments,
        builder_pending_withdrawals=pre.builder_pending_withdrawals,
        latest_execution_payload_bid=pre.latest_execution_payload_bid,
        payload_expected_withdrawals=pre.payload_expected_withdrawals,
        ptc_window=pre.ptc_window,
        # [New in EIP8205]
        validator_preregistrations=ValidatorPreregistrations(),
    )

    return post