123 lines
5.0 KiB
Markdown
123 lines
5.0 KiB
Markdown
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
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<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
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**Table of Contents** *generated with [DocToc](https://github.com/thlorenz/doctoc)*
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- [Ethereum 2.0 Phase 1 -- From Phase 0 to Phase 1](#ethereum-20-phase-1----from-phase-0-to-phase-1)
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- [Table of contents](#table-of-contents)
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- [Introduction](#introduction)
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- [Configuration](#configuration)
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- [Fork to Phase 1](#fork-to-phase-1)
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- [Fork trigger](#fork-trigger)
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- [Upgrading the state](#upgrading-the-state)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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# Ethereum 2.0 Phase 1 -- From Phase 0 to Phase 1
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**Notice**: This document is a work-in-progress for researchers and implementers.
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## Table of contents
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<!-- TOC -->
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TODO
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<!-- /TOC -->
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## Introduction
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This document describes the process of moving from Phase 0 to Phase 1 of Ethereum 2.0.
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## Configuration
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Warning: this configuration is not definitive.
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| Name | Value |
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| - | - |
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| `PHASE_1_FORK_VERSION` | `Version('0x01000000')` |
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| `PHASE_1_GENESIS_SLOT` | `2**5` **TBD** |
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| `INITIAL_ACTIVE_SHARDS` | `2**6` (= 64) |
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## Fork to Phase 1
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### Fork trigger
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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_GENESIS_SLOT`, where `PHASE_1_GENESIS_SLOT % SLOTS_PER_EPOCH == 0`.
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### Upgrading the state
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After `process_slots` of Phase 0 finishes, if `state.slot == PHASE_1_GENESIS_SLOT`, an irregular state change is made to upgrade to Phase 1.
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```python
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def upgrade_to_phase1(pre: phase0.BeaconState) -> BeaconState:
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epoch = get_current_epoch(pre)
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post = BeaconState(
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genesis_time=pre.genesis_time,
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slot=pre.slot,
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fork=Fork(
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previous_version=pre.fork.current_version,
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current_version=PHASE_1_FORK_VERSION,
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epoch=epoch,
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),
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# History
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latest_block_header=pre.latest_block_header,
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block_roots=pre.block_roots,
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state_roots=pre.state_roots,
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historical_roots=pre.historical_roots,
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# Eth1
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eth1_data=pre.eth1_data,
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eth1_data_votes=pre.eth1_data_votes,
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eth1_deposit_index=pre.eth1_deposit_index,
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# Registry
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validators=List[Validator, VALIDATOR_REGISTRY_LIMIT](
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Validator(
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pubkey=phase0_validator.pubkey,
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withdrawal_credentials=phase0_validator.withdrawal_credentials,
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effective_balance=phase0_validator.effective_balance,
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slashed=phase0_validator.slashed,
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activation_eligibility_epoch=phase0_validator.activation_eligibility_epoch,
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activation_epoch=phase0_validator.activation_eligibility_epoch,
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exit_epoch=phase0_validator.exit_epoch,
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withdrawable_epoch=phase0_validator.withdrawable_epoch,
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next_custody_secret_to_reveal=get_custody_period_for_validator(ValidatorIndex(i), epoch),
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all_custody_secrets_revealed_epoch=FAR_FUTURE_EPOCH,
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) for i, phase0_validator in enumerate(pre.validators)
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),
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balances=pre.balances,
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# Randomness
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randao_mixes=pre.randao_mixes,
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# Slashings
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slashings=pre.slashings,
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# Attestations
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# previous_epoch_attestations is cleared on upgrade.
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previous_epoch_attestations=List[PendingAttestation, MAX_ATTESTATIONS * SLOTS_PER_EPOCH](),
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# empty in pre state, since the upgrade is performed just after an epoch boundary.
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current_epoch_attestations=List[PendingAttestation, MAX_ATTESTATIONS * SLOTS_PER_EPOCH](),
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# Finality
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justification_bits=pre.justification_bits,
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previous_justified_checkpoint=pre.previous_justified_checkpoint,
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current_justified_checkpoint=pre.current_justified_checkpoint,
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finalized_checkpoint=pre.finalized_checkpoint,
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# Phase 1
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current_epoch_start_shard=Shard(0),
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shard_states=List[ShardState, MAX_SHARDS](
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ShardState(
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slot=pre.slot,
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gasprice=MIN_GASPRICE,
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transition_digest=Root(),
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latest_block_root=Root(),
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) for i in range(INITIAL_ACTIVE_SHARDS)
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),
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online_countdown=[ONLINE_PERIOD] * len(pre.validators), # all online
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current_light_committee=CompactCommittee(), # computed after state creation
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next_light_committee=CompactCommittee(),
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# Custody game
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exposed_derived_secrets=[] * EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS,
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# exposed_derived_secrets will fully default to zeroes
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)
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next_epoch = Epoch(epoch + 1)
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post.current_light_committee = committee_to_compact_committee(post, get_light_client_committee(post, epoch))
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post.next_light_committee = committee_to_compact_committee(post, get_light_client_committee(post, next_epoch))
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return post
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```
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