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5.0 KiB
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Ethereum 2.0 Phase 1 -- From Phase 0 to Phase 1
Notice: This document is a work-in-progress for researchers and implementers.
Table of contents
TODO
Introduction
This document describes the process of moving from Phase 0 to Phase 1 of Ethereum 2.0.
Configuration
Warning: this configuration is not definitive.
| Name | Value |
|---|---|
PHASE_1_FORK_VERSION |
Version('0x01000000') |
PHASE_1_FORK_SLOT |
Slot(0) TBD |
INITIAL_ACTIVE_SHARDS |
2**6 (= 64) |
Fork to Phase 1
Fork trigger
TBD. Social consensus, along with state conditions such as epoch boundary, finality, deposits, active validator count, etc. may be part of the decision process to trigger the fork. For now we assume the condition will be triggered at slot PHASE_1_FORK_SLOT, where PHASE_1_FORK_SLOT % SLOTS_PER_EPOCH == 0.
Upgrading the state
After process_slots of Phase 0 finishes, if state.slot == PHASE_1_FORK_SLOT, an irregular state change is made to upgrade to Phase 1.
def upgrade_to_phase1(pre: phase0.BeaconState) -> BeaconState:
epoch = get_current_epoch(pre)
post = BeaconState(
genesis_time=pre.genesis_time,
slot=pre.slot,
fork=Fork(
previous_version=pre.fork.current_version,
current_version=PHASE_1_FORK_VERSION,
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=List[Validator, VALIDATOR_REGISTRY_LIMIT](
Validator(
pubkey=phase0_validator.pubkey,
withdrawal_credentials=phase0_validator.withdrawal_credentials,
effective_balance=phase0_validator.effective_balance,
slashed=phase0_validator.slashed,
activation_eligibility_epoch=phase0_validator.activation_eligibility_epoch,
activation_epoch=phase0_validator.activation_eligibility_epoch,
exit_epoch=phase0_validator.exit_epoch,
withdrawable_epoch=phase0_validator.withdrawable_epoch,
next_custody_secret_to_reveal=get_custody_period_for_validator(ValidatorIndex(i), epoch),
all_custody_secrets_revealed_epoch=FAR_FUTURE_EPOCH,
) for i, phase0_validator in enumerate(pre.validators)
),
balances=pre.balances,
# Randomness
randao_mixes=pre.randao_mixes,
# Slashings
slashings=pre.slashings,
# Attestations
# previous_epoch_attestations is cleared on upgrade.
previous_epoch_attestations=List[PendingAttestation, MAX_ATTESTATIONS * SLOTS_PER_EPOCH](),
# empty in pre state, since the upgrade is performed just after an epoch boundary.
current_epoch_attestations=List[PendingAttestation, MAX_ATTESTATIONS * SLOTS_PER_EPOCH](),
# 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,
# Phase 1
current_epoch_start_shard=Shard(0),
shard_states=List[ShardState, MAX_SHARDS](
ShardState(
slot=compute_previous_slot(pre.slot),
gasprice=MIN_GASPRICE,
latest_block_root=Root(),
) for i in range(INITIAL_ACTIVE_SHARDS)
),
online_countdown=[ONLINE_PERIOD] * len(pre.validators), # all online
current_light_committee=CompactCommittee(), # computed after state creation
next_light_committee=CompactCommittee(),
# Custody game
exposed_derived_secrets=[()] * EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS,
# exposed_derived_secrets will fully default to zeroes
)
next_epoch = Epoch(epoch + 1)
post.current_light_committee = committee_to_compact_committee(post, get_light_client_committee(post, epoch))
post.next_light_committee = committee_to_compact_committee(post, get_light_client_committee(post, next_epoch))
return post