4.8 KiB
4.8 KiB
ePBS -- Fork Logic
Notice: This document is a work-in-progress for researchers and implementers.
Table of contents
Introduction
This document describes the process of the EIP-7732 upgrade.
Configuration
Warning: this configuration is not definitive.
| Name | Value |
|---|---|
EIP7732_FORK_VERSION |
Version('0x09000000') |
EIP7732_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 >= EIP7732_FORK_EPOCH:
return EIP7732_FORK_VERSION
if epoch >= ELECTRA_FORK_EPOCH:
return ELECTRA_FORK_VERSION
if epoch >= DENEB_FORK_EPOCH:
return DENEB_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-7732
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 EIP7732_FORK_EPOCH.
Upgrading the state
If state.slot % SLOTS_PER_EPOCH == 0 and compute_epoch_at_slot(state.slot) == EIP7732_FORK_EPOCH,
an irregular state change is made to upgrade to ePBS.
def upgrade_to_eip7732(pre: electra.BeaconState) -> BeaconState:
epoch = electra.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=EIP7732_FORK_VERSION, # [Modified in EIP-7732]
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=ExecutionPayloadHeader(), # [Modified in EIP-7732]
# Withdrawals
next_withdrawal_index=pre.next_withdrawal_index,
next_withdrawal_validator_index=pre.next_withdrawal_validator_index,
# Deep history valid from Capella onwards
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_balance_deposits=pre.pending_balance_deposits,
pending_partial_withdrawals=pre.pending_partial_withdrawals,
pending_consolidations=pre.pending_consolidations,
# ePBS
latest_block_hash=pre.latest_execution_payload_header.block_hash, # [New in EIP-7732]
latest_full_slot=pre.slot, # [New in EIP-7732]
latest_withdrawals_root=Root(), # [New in EIP-7732]
)
return post