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EIP-4844 -- Fork Logic

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

Introduction
Configuration
Helper functions
- Misc
  - Modified compute_fork_version
Fork to EIP-4844
- Fork trigger
- Upgrading the state

Introduction

This document describes the process of EIP-4844 upgrade.

Configuration

Warning: this configuration is not definitive.

Name	Value
`EIP4844_FORK_VERSION`	`Version('0x04000000')`
`EIP4844_FORK_EPOCH`	`Epoch(18446744073709551615)` TBD

Helper functions

Misc

Modified `compute_fork_version`

def compute_fork_version(epoch: Epoch) -> Version:
    """
    Return the fork version at the given ``epoch``.
    """
    if epoch >= EIP4844_FORK_EPOCH:
        return EIP4844_FORK_VERSION
    if epoch >= CAPELLA_FORK_EPOCH:
        return CAPELLA_FORK_VERSION
    if epoch >= BELLATRIX_FORK_EPOCH:
        return BELLATRIX_FORK_VERSION
    if epoch >= ALTAIR_FORK_EPOCH:
        return ALTAIR_FORK_VERSION
    return GENESIS_FORK_VERSION

Fork to EIP-4844

Fork trigger

TBD. This fork is defined for testing purposes, the EIP may be combined with other consensus-layer upgrade. For now we assume the condition will be triggered at epoch EIP4844_FORK_EPOCH.

Note that for the pure EIP-4844 networks, we don't apply upgrade_to_eip4844 since it starts with EIP-4844 version logic.

Upgrading the state

Since the eip4844.BeaconState format is equal to the capella.BeaconState format, we only have to update BeaconState.fork.

def upgrade_to_eip4844(pre: capella.BeaconState) -> BeaconState:
    epoch = capella.get_current_epoch(pre)
    post = BeaconState(
        # Versioning
        genesis_time=pre.genesis_time,
        genesis_validators_root=pre.genesis_validators_root,
        slot=pre.slot,
        fork=Fork(
            previous_version=pre.fork.current_version,
            current_version=EIP4844_FORK_VERSION,  # [Modified in EIP4844]
            epoch=epoch,
        ),
        # History
        latest_block_header=pre.latest_block_header,
        block_roots=pre.block_roots,
        state_roots=pre.state_roots,
        historical_roots=pre.historical_roots,
        # Eth1
        eth1_data=pre.eth1_data,
        eth1_data_votes=pre.eth1_data_votes,
        eth1_deposit_index=pre.eth1_deposit_index,
        # Registry
        validators=pre.validators,
        balances=pre.balances,
        # Randomness
        randao_mixes=pre.randao_mixes,
        # Slashings
        slashings=pre.slashings,
        # Participation
        previous_epoch_participation=pre.previous_epoch_participation,
        current_epoch_participation=pre.current_epoch_participation,
        # Finality
        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
        inactivity_scores=pre.inactivity_scores,
        # Sync
        current_sync_committee=pre.current_sync_committee,
        next_sync_committee=pre.next_sync_committee,
        # Execution-layer
        latest_execution_payload_header=pre.latest_execution_payload_header,
        # Withdrawals
        withdrawal_queue=pre.withdrawal_queue,
        next_withdrawal_index=pre.next_withdrawal_index,
        next_partial_withdrawal_validator_index=pre.next_partial_withdrawal_validator_index,
    )

    return post

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