4.8 KiB
4.8 KiB
EIP7251 -- 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 EIP7251 upgrade.
Configuration
Warning: this configuration is not definitive.
| Name | Value |
|---|---|
EIP7251_FORK_VERSION |
Version('0x06000000') |
EIP7251_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 >= EIP7251_FORK_EPOCH:
return EIP7251_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 EIP7251
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 EIP7251_FORK_EPOCH.
Note that for the pure EIP7251 networks, we don't apply upgrade_to_eip7251 since it starts with EIP7251 version logic.
Upgrading the state
If state.slot % SLOTS_PER_EPOCH == 0 and compute_epoch_at_slot(state.slot) == EIP7251_FORK_EPOCH,
an irregular state change is made to upgrade to EIP7251.
def upgrade_to_eip7251(pre: deneb.BeaconState) -> BeaconState:
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=EIP7251_FORK_VERSION,
epoch=deneb.get_current_epoch(pre),
),
# 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
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,
# [New in EIP7251]
deposit_balance_to_consume=0,
exit_balance_to_consume=get_activation_exit_churn_limit(pre),
earliest_exit_epoch=max([v.exit_epoch for v in pre.validators if v.exit_epoch != FAR_FUTURE_EPOCH]) + 1,
consolidation_balance_to_consume=get_consolidation_churn_limit(pre),
earliest_consolidation_epoch=compute_activation_exit_epoch(get_current_epoch(pre)),
pending_balance_deposits=[],
pending_partial_withdrawals=[],
pending_consolidations=[],
)
# Ensure early adopters of compounding credentials go through the activation churn
for index, validator in enumerate(post.validators):
if has_compounding_withdrawal_credential(validator):
queue_excess_active_balance(post, index)
return post