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Gloas -- Fork Logic

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

Introduction

This document describes the process of the Gloas upgrade.

Configuration

Warning: this configuration is not definitive.

Name Value
GLOAS_FORK_VERSION Version('0x07000000')
GLOAS_FORK_EPOCH Epoch(18446744073709551615) TBD

Helpers

New onboard_builders_from_pending_deposits

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def onboard_builders_from_pending_deposits(state: BeaconState) -> None:
    """
    Applies any pending deposit for builders, effectively
    onboarding builders at the fork.
    """
    validator_pubkeys = [v.pubkey for v in state.validators]

    pending_deposits = []
    for deposit in state.pending_deposits:
        # Deposits for existing validators stay in pending queue
        if deposit.pubkey in validator_pubkeys:
            pending_deposits.append(deposit)
            continue

        # If the pubkey is associated with a builder that was created in a
        # previous iteration or it is a builder deposit, try to apply the
        # deposit to the new/existing builder. Note that the function
        # apply_deposit_for_builder can mutate the state and may add a builder
        # to the registry. For this reason, the list of builder pubkeys must
        # be recomputed each iteration.
        builder_pubkeys = [b.pubkey for b in state.builders]
        is_existing_builder = deposit.pubkey in builder_pubkeys
        has_builder_credentials = is_builder_withdrawal_credential(deposit.withdrawal_credentials)
        if is_existing_builder or has_builder_credentials:
            apply_deposit_for_builder(
                state,
                deposit.pubkey,
                deposit.withdrawal_credentials,
                deposit.amount,
                deposit.signature,
            )
            continue

        # If there is a pending deposit for a new validator that has a valid
        # signature, track the pubkey so that subsequent builder deposits for
        # the same pubkey stay in pending (applied to the validator later)
        # rather than creating a builder. Deposits with invalid signatures are
        # dropped here since they would fail in apply_pending_deposits anyway.
        if is_valid_deposit_signature(
            deposit.pubkey, deposit.withdrawal_credentials, deposit.amount, deposit.signature
        ):
            validator_pubkeys.append(deposit.pubkey)
            pending_deposits.append(deposit)

    state.pending_deposits = pending_deposits

Fork to Gloas

Fork trigger

The fork is triggered at epoch GLOAS_FORK_EPOCH.

Upgrading the state

If state.slot % SLOTS_PER_EPOCH == 0 and compute_epoch_at_slot(state.slot) == GLOAS_FORK_EPOCH, an irregular state change is made to upgrade to Gloas.

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def upgrade_to_gloas(pre: fulu.BeaconState) -> BeaconState:
    epoch = fulu.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,
            # [Modified in Gloas:EIP7732]
            current_version=GLOAS_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,
        eth1_data=pre.eth1_data,
        eth1_data_votes=pre.eth1_data_votes,
        eth1_deposit_index=pre.eth1_deposit_index,
        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,
        # [Modified in Gloas:EIP7732]
        # Removed `latest_execution_payload_header`
        # [New in Gloas:EIP7732]
        latest_execution_payload_bid=ExecutionPayloadBid(
            block_hash=pre.latest_execution_payload_header.block_hash,
        ),
        next_withdrawal_index=pre.next_withdrawal_index,
        next_withdrawal_validator_index=pre.next_withdrawal_validator_index,
        historical_summaries=pre.historical_summaries,
        deposit_requests_start_index=pre.deposit_requests_start_index,
        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,
        # [New in Gloas:EIP7732]
        builders=[],
        # [New in Gloas:EIP7732]
        next_withdrawal_builder_index=BuilderIndex(0),
        # [New in Gloas:EIP7732]
        execution_payload_availability=[0b1 for _ in range(SLOTS_PER_HISTORICAL_ROOT)],
        # [New in Gloas:EIP7732]
        builder_pending_payments=[BuilderPendingPayment() for _ in range(2 * SLOTS_PER_EPOCH)],
        # [New in Gloas:EIP7732]
        builder_pending_withdrawals=[],
        # [New in Gloas:EIP7732]
        latest_block_hash=pre.latest_execution_payload_header.block_hash,
        # [New in Gloas:EIP7732]
        payload_expected_withdrawals=[],
    )

    # [New in Gloas:EIP7732]
    onboard_builders_from_pending_deposits(post)

    return post