1001 lines
40 KiB
Markdown
1001 lines
40 KiB
Markdown
# EIP7251 - Spec
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## Table of contents
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<!-- TOC -->
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<!-- 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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- [Introduction](#introduction)
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- [Constants](#constants)
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- [Misc](#misc)
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- [Withdrawal prefixes](#withdrawal-prefixes)
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- [Domains](#domains)
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- [Presets](#presets)
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- [Gwei values](#gwei-values)
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- [Rewards and penalties](#rewards-and-penalties)
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- [Max operations per block](#max-operations-per-block)
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- [Execution](#execution)
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- [State list lengths](#state-list-lengths)
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- [Configuration](#configuration)
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- [Validator cycle](#validator-cycle)
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- [Containers](#containers)
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- [New containers](#new-containers)
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- [New `PendingBalanceDeposit`](#new-pendingbalancedeposit)
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- [New `PendingPartialWithdrawal`](#new-pendingpartialwithdrawal)
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- [New `ExecutionLayerWithdrawRequest`](#new-executionlayerwithdrawrequest)
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- [New `Consolidation`](#new-consolidation)
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- [New `SignedConsolidation`](#new-signedconsolidation)
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- [New `PendingConsolidation`](#new-pendingconsolidation)
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- [Extended Containers](#extended-containers)
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- [`BeaconState`](#beaconstate)
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- [`BeaconBlockBody`](#beaconblockbody)
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- [Helpers](#helpers)
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- [Predicates](#predicates)
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- [Updated `is_eligible_for_activation_queue`](#updated-is_eligible_for_activation_queue)
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- [New `is_compounding_withdrawal_credential`](#new-is_compounding_withdrawal_credential)
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- [New `has_compounding_withdrawal_credential`](#new-has_compounding_withdrawal_credential)
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- [New `has_execution_withdrawal_credential`](#new-has_execution_withdrawal_credential)
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- [Updated `is_fully_withdrawable_validator`](#updated-is_fully_withdrawable_validator)
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- [Updated `is_partially_withdrawable_validator`](#updated-is_partially_withdrawable_validator)
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- [Beacon state accessors](#beacon-state-accessors)
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- [New `get_validator_max_effective_balance`](#new-get_validator_max_effective_balance)
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- [New `get_churn_limit`](#new-get_churn_limit)
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- [New `get_activation_exit_churn_limit`](#new-get_activation_exit_churn_limit)
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- [New `get_consolidation_churn_limit`](#new-get_consolidation_churn_limit)
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- [New `get_active_balance`](#new-get_active_balance)
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- [New `get_pending_balance_to_withdraw`](#new-get_pending_balance_to_withdraw)
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- [Beacon state mutators](#beacon-state-mutators)
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- [Updated `initiate_validator_exit`](#updated--initiate_validator_exit)
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- [New `switch_to_compounding_validator`](#new-switch_to_compounding_validator)
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- [New `queue_excess_active_balance`](#new-queue_excess_active_balance)
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- [New `compute_exit_epoch_and_update_churn`](#new-compute_exit_epoch_and_update_churn)
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- [New `compute_consolidation_epoch_and_update_churn`](#new-compute_consolidation_epoch_and_update_churn)
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- [Updated `slash_validator`](#updated-slash_validator)
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- [Beacon chain state transition function](#beacon-chain-state-transition-function)
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- [Epoch processing](#epoch-processing)
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- [Updated `process_epoch`](#updated-process_epoch)
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- [Updated `process_registry_updates`](#updated--process_registry_updates)
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- [New `process_pending_balance_deposits`](#new-process_pending_balance_deposits)
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- [New `process_pending_consolidations`](#new-process_pending_consolidations)
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- [Updated `process_effective_balance_updates`](#updated-process_effective_balance_updates)
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- [Block processing](#block-processing)
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- [Updated `get_expected_withdrawals`](#updated-get_expected_withdrawals)
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- [Updated `process_withdrawals`](#updated-process_withdrawals)
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- [Operations](#operations)
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- [Updated `process_operations`](#updated-process_operations)
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- [Deposits](#deposits)
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- [Updated `apply_deposit`](#updated--apply_deposit)
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- [New `is_valid_deposit_signature`](#new-is_valid_deposit_signature)
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- [Modified `add_validator_to_registry`](#modified-add_validator_to_registry)
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- [Updated `get_validator_from_deposit`](#updated-get_validator_from_deposit)
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- [Withdrawals](#withdrawals)
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- [New `process_execution_layer_withdraw_request`](#new-process_execution_layer_withdraw_request)
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- [Consolidations](#consolidations)
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- [New `process_consolidation`](#new-process_consolidation)
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- [Voluntary exits](#voluntary-exits)
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- [Updated `process_voluntary_exit`](#updated-process_voluntary_exit)
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<!-- END doctoc generated TOC please keep comment here to allow auto update -->
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<!-- /TOC -->
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## Introduction
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See [a modest proposal](https://notes.ethereum.org/@mikeneuder/increase-maxeb), the [diff view](https://github.com/michaelneuder/consensus-specs/pull/3/files) and
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[security considerations](https://notes.ethereum.org/@fradamt/meb-increase-security).
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*Note:* This specification is built upon [Deneb](../../deneb/beacon-chain.md).
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## Constants
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The following values are (non-configurable) constants used throughout the specification.
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### Misc
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| Name | Value |
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| - | - |
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| `FULL_EXIT_REQUEST_AMOUNT` | `uint64(0)` |
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### Withdrawal prefixes
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| Name | Value |
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| - | - |
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| `BLS_WITHDRAWAL_PREFIX` | `Bytes1('0x00')` |
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| `ETH1_ADDRESS_WITHDRAWAL_PREFIX` | `Bytes1('0x01')` |
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| `COMPOUNDING_WITHDRAWAL_PREFIX` | `Bytes1('0x02')` |
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### Domains
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| Name | Value |
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| - | - |
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| `DOMAIN_CONSOLIDATION` | `DomainType('0x0B000000')` |
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## Presets
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### Gwei values
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| Name | Value |
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| - | - |
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| `MIN_ACTIVATION_BALANCE` | `Gwei(2**5 * 10**9)` (= 32,000,000,000) |
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| `MAX_EFFECTIVE_BALANCE_EIP7251` | `Gwei(2**11 * 10**9)` (= 2048,000,000,000) |
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### Rewards and penalties
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| Name | Value |
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| - | - |
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| `MIN_SLASHING_PENALTY_QUOTIENT_EIP7251` | `uint64(2**12)` (= 4,096) |
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| `WHISTLEBLOWER_REWARD_QUOTIENT_EIP7251` | `uint64(2**12)` (= 4,096) |
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### Max operations per block
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| Name | Value |
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| - | - |
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| `MAX_CONSOLIDATIONS` | `uint64(1)` |
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### Execution
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| Name | Value | Description |
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| - | - | - |
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| `MAX_PARTIAL_WITHDRAWALS_PER_PAYLOAD` | `uint64(2**3)` (= 8) | Maximum amount of partial withdrawals allowed in each payload |
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### State list lengths
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| Name | Value | Unit |
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| - | - | :-: |
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| `PENDING_BALANCE_DEPOSITS_LIMIT` | `uint64(2**27)` (= 134,217,728) | pending balance deposits |
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| `PENDING_PARTIAL_WITHDRAWALS_LIMIT` | `uint64(2**27)` (= 134,217,728) | pending partial withdrawals |
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| `PENDING_CONSOLIDATIONS_LIMIT` | `uint64(2**18)` (= 262,144) | pending consolidations |
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## Configuration
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### Validator cycle
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| Name | Value |
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| - | - |
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| `MIN_PER_EPOCH_CHURN_LIMIT_EIP7251` | `Gwei(2**7 * 10**9)` (= 128,000,000,000) | # Equivalent to 4 32 ETH validators
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| `MAX_PER_EPOCH_ACTIVATION_EXIT_CHURN_LIMIT` | `Gwei(2**8 * 10**9)` (256,000,000,000) |
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## Containers
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### New containers
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#### New `PendingBalanceDeposit`
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```python
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class PendingBalanceDeposit(Container):
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index: ValidatorIndex
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amount: Gwei
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```
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#### New `PendingPartialWithdrawal`
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```python
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class PendingPartialWithdrawal(Container):
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index: ValidatorIndex
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amount: Gwei
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withdrawable_epoch: Epoch
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```
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#### New `ExecutionLayerWithdrawRequest`
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```python
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class ExecutionLayerWithdrawRequest(Container):
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source_address: ExecutionAddress
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validator_pubkey: BLSPubkey
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amount: Gwei
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```
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#### New `Consolidation`
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```python
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class Consolidation(Container):
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source_index: ValidatorIndex
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target_index: ValidatorIndex
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epoch: Epoch
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```
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#### New `SignedConsolidation`
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```python
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class SignedConsolidation(Container):
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message: Consolidation
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signature: BLSSignature
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```
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#### New `PendingConsolidation`
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```python
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class PendingConsolidation(Container):
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source_index: ValidatorIndex
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target_index: ValidatorIndex
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```
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### Extended Containers
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#### `BeaconState`
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```python
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class BeaconState(Container):
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# Versioning
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genesis_time: uint64
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genesis_validators_root: Root
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slot: Slot
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fork: Fork
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# History
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latest_block_header: BeaconBlockHeader
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block_roots: Vector[Root, SLOTS_PER_HISTORICAL_ROOT]
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state_roots: Vector[Root, SLOTS_PER_HISTORICAL_ROOT]
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historical_roots: List[Root, HISTORICAL_ROOTS_LIMIT]
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# Eth1
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eth1_data: Eth1Data
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eth1_data_votes: List[Eth1Data, EPOCHS_PER_ETH1_VOTING_PERIOD * SLOTS_PER_EPOCH]
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eth1_deposit_index: uint64
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# Registry
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validators: List[Validator, VALIDATOR_REGISTRY_LIMIT]
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balances: List[Gwei, VALIDATOR_REGISTRY_LIMIT]
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# Randomness
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randao_mixes: Vector[Bytes32, EPOCHS_PER_HISTORICAL_VECTOR]
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# Slashings
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slashings: Vector[Gwei, EPOCHS_PER_SLASHINGS_VECTOR] # Per-epoch sums of slashed effective balances
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# Participation
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previous_epoch_participation: List[ParticipationFlags, VALIDATOR_REGISTRY_LIMIT]
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current_epoch_participation: List[ParticipationFlags, VALIDATOR_REGISTRY_LIMIT]
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# Finality
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justification_bits: Bitvector[JUSTIFICATION_BITS_LENGTH] # Bit set for every recent justified epoch
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previous_justified_checkpoint: Checkpoint
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current_justified_checkpoint: Checkpoint
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finalized_checkpoint: Checkpoint
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# Inactivity
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inactivity_scores: List[uint64, VALIDATOR_REGISTRY_LIMIT]
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# Sync
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current_sync_committee: SyncCommittee
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next_sync_committee: SyncCommittee
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# Execution
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latest_execution_payload_header: ExecutionPayloadHeader
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# Withdrawals
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next_withdrawal_index: WithdrawalIndex
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next_withdrawal_validator_index: ValidatorIndex
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# Deep history valid from Capella onwards
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historical_summaries: List[HistoricalSummary, HISTORICAL_ROOTS_LIMIT]
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# EIP-7251
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deposit_balance_to_consume: Gwei # [New in EIP-7251]
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exit_balance_to_consume: Gwei # [New in EIP-7251]
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earliest_exit_epoch: Epoch # [New in EIP-7251]
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consolidation_balance_to_consume: Gwei # [New in EIP-7251]
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earliest_consolidation_epoch: Epoch # [New in EIP-7251]
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pending_balance_deposits: List[PendingBalanceDeposit, PENDING_BALANCE_DEPOSITS_LIMIT] # [New in EIP-7251]
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pending_partial_withdrawals: List[PendingPartialWithdrawal, PENDING_PARTIAL_WITHDRAWALS_LIMIT] # [New in EIP-7251]
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pending_consolidations: List[PendingConsolidation, PENDING_CONSOLIDATIONS_LIMIT] # [New in EIP-7251]
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```
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#### `BeaconBlockBody`
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```python
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class BeaconBlockBody(Container):
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randao_reveal: BLSSignature
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eth1_data: Eth1Data # Eth1 data vote
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graffiti: Bytes32 # Arbitrary data
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# Operations
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proposer_slashings: List[ProposerSlashing, MAX_PROPOSER_SLASHINGS]
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attester_slashings: List[AttesterSlashing, MAX_ATTESTER_SLASHINGS]
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attestations: List[Attestation, MAX_ATTESTATIONS]
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deposits: List[Deposit, MAX_DEPOSITS]
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voluntary_exits: List[SignedVoluntaryExit, MAX_VOLUNTARY_EXITS]
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sync_aggregate: SyncAggregate
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# Execution
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execution_payload: ExecutionPayload
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bls_to_execution_changes: List[SignedBLSToExecutionChange, MAX_BLS_TO_EXECUTION_CHANGES]
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blob_kzg_commitments: List[KZGCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK]
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consolidations: List[SignedConsolidation, MAX_CONSOLIDATIONS] # [New in EIP-7251]
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```
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## Helpers
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### Predicates
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#### Updated `is_eligible_for_activation_queue`
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```python
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def is_eligible_for_activation_queue(validator: Validator) -> bool:
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"""
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Check if ``validator`` is eligible to be placed into the activation queue.
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"""
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return (
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validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH
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and validator.effective_balance >= MIN_ACTIVATION_BALANCE # [Modified in EIP7251]
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)
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```
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#### New `is_compounding_withdrawal_credential`
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```python
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def is_compounding_withdrawal_credential(withdrawal_credentials: Bytes32) -> bool:
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return withdrawal_credentials[:1] == COMPOUNDING_WITHDRAWAL_PREFIX
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```
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#### New `has_compounding_withdrawal_credential`
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```python
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def has_compounding_withdrawal_credential(validator: Validator) -> bool:
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"""
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Check if ``validator`` has an 0x02 prefixed "compounding" withdrawal credential.
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"""
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return is_compounding_withdrawal_credential(validator.withdrawal_credentials)
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```
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#### New `has_execution_withdrawal_credential`
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```python
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def has_execution_withdrawal_credential(validator: Validator) -> bool:
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"""
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Check if ``validator`` has a 0x01 or 0x02 prefixed withdrawal credential.
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"""
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return has_compounding_withdrawal_credential(validator) or has_eth1_withdrawal_credential(validator)
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```
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#### Updated `is_fully_withdrawable_validator`
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```python
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def is_fully_withdrawable_validator(validator: Validator, balance: Gwei, epoch: Epoch) -> bool:
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"""
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Check if ``validator`` is fully withdrawable.
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"""
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return (
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has_execution_withdrawal_credential(validator) # [Modified in EIP7251]
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and validator.withdrawable_epoch <= epoch
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and balance > 0
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)
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```
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#### Updated `is_partially_withdrawable_validator`
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```python
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def is_partially_withdrawable_validator(validator: Validator, balance: Gwei) -> bool:
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"""
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Check if ``validator`` is partially withdrawable.
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"""
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max_effective_balance = get_validator_max_effective_balance(validator)
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has_max_effective_balance = validator.effective_balance == max_effective_balance # [Modified in EIP7251]
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has_excess_balance = balance > max_effective_balance # [Modified in EIP7251]
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return (
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has_execution_withdrawal_credential(validator) # [Modified in EIP7251]
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and has_max_effective_balance
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and has_excess_balance
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)
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```
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### Beacon state accessors
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#### New `get_validator_max_effective_balance`
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```python
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def get_validator_max_effective_balance(validator: Validator) -> Gwei:
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"""
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Get max effective balance for ``validator``.
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"""
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if has_compounding_withdrawal_credential(validator):
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return MAX_EFFECTIVE_BALANCE_EIP7251
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else:
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return MIN_ACTIVATION_BALANCE
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```
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#### New `get_churn_limit`
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```python
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def get_churn_limit(state: BeaconState) -> Gwei:
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"""
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Return the churn limit for the current epoch.
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"""
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churn = max(
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MIN_PER_EPOCH_CHURN_LIMIT_EIP7251,
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get_total_active_balance(state) // CHURN_LIMIT_QUOTIENT
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)
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return churn - churn % EFFECTIVE_BALANCE_INCREMENT
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```
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#### New `get_activation_exit_churn_limit`
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```python
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def get_activation_exit_churn_limit(state: BeaconState) -> Gwei:
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"""
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Return the churn limit for the current epoch dedicated to activations and exits.
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"""
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return min(MAX_PER_EPOCH_ACTIVATION_EXIT_CHURN_LIMIT, get_churn_limit(state))
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```
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#### New `get_consolidation_churn_limit`
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```python
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def get_consolidation_churn_limit(state: BeaconState) -> Gwei:
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return get_churn_limit(state) - get_activation_exit_churn_limit(state)
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```
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#### New `get_active_balance`
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```python
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def get_active_balance(state: BeaconState, validator_index: ValidatorIndex) -> Gwei:
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max_effective_balance = get_validator_max_effective_balance(state.validators[validator_index])
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return min(state.balances[validator_index], max_effective_balance)
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```
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#### New `get_pending_balance_to_withdraw`
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```python
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def get_pending_balance_to_withdraw(state: BeaconState, validator_index: ValidatorIndex) -> Gwei:
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return sum(
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withdrawal.amount for withdrawal in state.pending_partial_withdrawals if withdrawal.index == validator_index)
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```
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### Beacon state mutators
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#### Updated `initiate_validator_exit`
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```python
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def initiate_validator_exit(state: BeaconState, index: ValidatorIndex) -> None:
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"""
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Initiate the exit of the validator with index ``index``.
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"""
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# Return if validator already initiated exit
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validator = state.validators[index]
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if validator.exit_epoch != FAR_FUTURE_EPOCH:
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return
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# Compute exit queue epoch [Modified in EIP 7251]
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exit_queue_epoch = compute_exit_epoch_and_update_churn(state, validator.effective_balance)
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# Set validator exit epoch and withdrawable epoch
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validator.exit_epoch = exit_queue_epoch
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validator.withdrawable_epoch = Epoch(validator.exit_epoch + MIN_VALIDATOR_WITHDRAWABILITY_DELAY)
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```
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#### New `switch_to_compounding_validator`
|
|
|
|
```python
|
|
def switch_to_compounding_validator(state: BeaconState, index: ValidatorIndex) -> None:
|
|
validator = state.validators[index]
|
|
if has_eth1_withdrawal_credential(validator):
|
|
validator.withdrawal_credentials[:1] = COMPOUNDING_WITHDRAWAL_PREFIX
|
|
queue_excess_active_balance(state, index)
|
|
```
|
|
|
|
#### New `queue_excess_active_balance`
|
|
|
|
```python
|
|
def queue_excess_active_balance(state: BeaconState, index: ValidatorIndex) -> None:
|
|
balance = state.balances[index]
|
|
if balance > MIN_ACTIVATION_BALANCE:
|
|
excess_balance = balance - MIN_ACTIVATION_BALANCE
|
|
state.balances[index] = MIN_ACTIVATION_BALANCE
|
|
state.pending_balance_deposits.append(
|
|
PendingBalanceDeposit(index=index, amount=excess_balance)
|
|
)
|
|
```
|
|
|
|
#### New `compute_exit_epoch_and_update_churn`
|
|
|
|
|
|
```python
|
|
def compute_exit_epoch_and_update_churn(state: BeaconState, exit_balance: Gwei) -> Epoch:
|
|
earliest_exit_epoch = compute_activation_exit_epoch(get_current_epoch(state))
|
|
per_epoch_churn = get_activation_exit_churn_limit(state)
|
|
# New epoch for exits.
|
|
if state.earliest_exit_epoch < earliest_exit_epoch:
|
|
state.earliest_exit_epoch = earliest_exit_epoch
|
|
state.exit_balance_to_consume = per_epoch_churn
|
|
|
|
if exit_balance <= state.exit_balance_to_consume:
|
|
# Exit fits in the current earliest epoch.
|
|
state.exit_balance_to_consume -= exit_balance
|
|
else:
|
|
# Exit doesn't fit in the current earliest epoch.
|
|
balance_to_process = exit_balance - state.exit_balance_to_consume
|
|
additional_epochs, remainder = divmod(balance_to_process, per_epoch_churn)
|
|
state.earliest_exit_epoch += additional_epochs + 1
|
|
state.exit_balance_to_consume = per_epoch_churn - remainder
|
|
|
|
return state.earliest_exit_epoch
|
|
```
|
|
|
|
#### New `compute_consolidation_epoch_and_update_churn`
|
|
|
|
```python
|
|
def compute_consolidation_epoch_and_update_churn(state: BeaconState, consolidation_balance: Gwei) -> Epoch:
|
|
earliest_consolidation_epoch = compute_activation_exit_epoch(get_current_epoch(state))
|
|
per_epoch_consolidation_churn = get_consolidation_churn_limit(state)
|
|
# New epoch for consolidations.
|
|
if state.earliest_consolidation_epoch < earliest_consolidation_epoch:
|
|
state.earliest_consolidation_epoch = earliest_consolidation_epoch
|
|
state.consolidation_balance_to_consume = per_epoch_consolidation_churn
|
|
|
|
if consolidation_balance <= state.consolidation_balance_to_consume:
|
|
# Consolidation fits in the current earliest consolidation epoch.
|
|
state.consolidation_balance_to_consume -= consolidation_balance
|
|
else:
|
|
# Consolidation doesn't fit in the current earliest epoch.
|
|
balance_to_process = consolidation_balance - state.consolidation_balance_to_consume
|
|
additional_epochs, remainder = divmod(balance_to_process, per_epoch_consolidation_churn)
|
|
state.earliest_consolidation_epoch += additional_epochs + 1
|
|
state.consolidation_balance_to_consume = per_epoch_consolidation_churn - remainder
|
|
|
|
return state.earliest_consolidation_epoch
|
|
```
|
|
|
|
#### Updated `slash_validator`
|
|
|
|
```python
|
|
def slash_validator(state: BeaconState,
|
|
slashed_index: ValidatorIndex,
|
|
whistleblower_index: ValidatorIndex=None) -> None:
|
|
"""
|
|
Slash the validator with index ``slashed_index``.
|
|
"""
|
|
epoch = get_current_epoch(state)
|
|
initiate_validator_exit(state, slashed_index)
|
|
validator = state.validators[slashed_index]
|
|
validator.slashed = True
|
|
validator.withdrawable_epoch = max(validator.withdrawable_epoch, Epoch(epoch + EPOCHS_PER_SLASHINGS_VECTOR))
|
|
state.slashings[epoch % EPOCHS_PER_SLASHINGS_VECTOR] += validator.effective_balance
|
|
slashing_penalty = validator.effective_balance // MIN_SLASHING_PENALTY_QUOTIENT_EIP7251 # [Modified in EIP7251]
|
|
decrease_balance(state, slashed_index, slashing_penalty)
|
|
|
|
# Apply proposer and whistleblower rewards
|
|
proposer_index = get_beacon_proposer_index(state)
|
|
if whistleblower_index is None:
|
|
whistleblower_index = proposer_index
|
|
whistleblower_reward = Gwei(
|
|
validator.effective_balance // WHISTLEBLOWER_REWARD_QUOTIENT_EIP7251) # [Modified in EIP7251]
|
|
proposer_reward = Gwei(whistleblower_reward * PROPOSER_WEIGHT // WEIGHT_DENOMINATOR)
|
|
increase_balance(state, proposer_index, proposer_reward)
|
|
increase_balance(state, whistleblower_index, Gwei(whistleblower_reward - proposer_reward))
|
|
```
|
|
|
|
## Beacon chain state transition function
|
|
|
|
### Epoch processing
|
|
|
|
#### Updated `process_epoch`
|
|
```python
|
|
def process_epoch(state: BeaconState) -> None:
|
|
process_justification_and_finalization(state)
|
|
process_inactivity_updates(state)
|
|
process_rewards_and_penalties(state)
|
|
process_registry_updates(state) # [Modified in EIP7251]
|
|
process_slashings(state)
|
|
process_eth1_data_reset(state)
|
|
process_pending_balance_deposits(state) # New in EIP7251
|
|
process_pending_consolidations(state) # New in EIP7251
|
|
process_effective_balance_updates(state) # [Modified in EIP7251]
|
|
process_slashings_reset(state)
|
|
process_randao_mixes_reset(state)
|
|
```
|
|
|
|
#### Updated `process_registry_updates`
|
|
|
|
```python
|
|
def process_registry_updates(state: BeaconState) -> None:
|
|
# Process activation eligibility and ejections
|
|
for index, validator in enumerate(state.validators):
|
|
if is_eligible_for_activation_queue(validator):
|
|
validator.activation_eligibility_epoch = get_current_epoch(state) + 1
|
|
if (
|
|
is_active_validator(validator, get_current_epoch(state))
|
|
and validator.effective_balance <= EJECTION_BALANCE
|
|
):
|
|
initiate_validator_exit(state, ValidatorIndex(index))
|
|
|
|
# Activate all eligible validators
|
|
activation_epoch = compute_activation_exit_epoch(get_current_epoch(state))
|
|
for validator in state.validators:
|
|
if is_eligible_for_activation(state, validator):
|
|
validator.activation_epoch = activation_epoch
|
|
```
|
|
|
|
#### New `process_pending_balance_deposits`
|
|
|
|
```python
|
|
def process_pending_balance_deposits(state: BeaconState) -> None:
|
|
available_for_processing = state.deposit_balance_to_consume + get_activation_exit_churn_limit(state)
|
|
processed_amount = 0
|
|
next_deposit_index = 0
|
|
|
|
for deposit in state.pending_balance_deposits:
|
|
if processed_amount + deposit.amount > available_for_processing:
|
|
break
|
|
increase_balance(state, deposit.index, deposit.amount)
|
|
processed_amount += deposit.amount
|
|
next_deposit_index += 1
|
|
|
|
state.pending_balance_deposits = state.pending_balance_deposits[next_deposit_index:]
|
|
|
|
if len(state.pending_balance_deposits) == 0:
|
|
state.deposit_balance_to_consume = 0
|
|
else:
|
|
state.deposit_balance_to_consume = available_for_processing - processed_amount
|
|
```
|
|
|
|
#### New `process_pending_consolidations`
|
|
|
|
```python
|
|
def process_pending_consolidations(state: BeaconState) -> None:
|
|
next_pending_consolidation = 0
|
|
for pending_consolidation in state.pending_consolidations:
|
|
source_validator = state.validators[pending_consolidation.source_index]
|
|
if source_validator.slashed:
|
|
next_pending_consolidation += 1
|
|
continue
|
|
if source_validator.withdrawable_epoch > get_current_epoch(state):
|
|
break
|
|
|
|
# Churn any target excess active balance of target and raise its max
|
|
switch_to_compounding_validator(state, pending_consolidation.target_index)
|
|
# Move active balance to target. Excess balance is withdrawable.
|
|
active_balance = get_active_balance(state, pending_consolidation.source_index)
|
|
decrease_balance(state, pending_consolidation.source_index, active_balance)
|
|
increase_balance(state, pending_consolidation.target_index, active_balance)
|
|
next_pending_consolidation += 1
|
|
|
|
state.pending_consolidations = state.pending_consolidations[next_pending_consolidation:]
|
|
```
|
|
|
|
#### Updated `process_effective_balance_updates`
|
|
|
|
```python
|
|
def process_effective_balance_updates(state: BeaconState) -> None:
|
|
# Update effective balances with hysteresis
|
|
for index, validator in enumerate(state.validators):
|
|
balance = state.balances[index]
|
|
HYSTERESIS_INCREMENT = uint64(EFFECTIVE_BALANCE_INCREMENT // HYSTERESIS_QUOTIENT)
|
|
DOWNWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_DOWNWARD_MULTIPLIER
|
|
UPWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_UPWARD_MULTIPLIER
|
|
EFFECTIVE_BALANCE_LIMIT = (
|
|
MAX_EFFECTIVE_BALANCE_EIP7251 if has_compounding_withdrawal_credential(validator)
|
|
else MIN_ACTIVATION_BALANCE
|
|
)
|
|
|
|
if (
|
|
balance + DOWNWARD_THRESHOLD < validator.effective_balance
|
|
or validator.effective_balance + UPWARD_THRESHOLD < balance
|
|
):
|
|
validator.effective_balance = min(balance - balance % EFFECTIVE_BALANCE_INCREMENT, EFFECTIVE_BALANCE_LIMIT)
|
|
```
|
|
|
|
### Block processing
|
|
|
|
```python
|
|
def process_block(state: BeaconState, block: BeaconBlock) -> None:
|
|
process_block_header(state, block)
|
|
process_withdrawals(state, block.body.execution_payload) # [Modified in EIP7251]
|
|
process_execution_payload(state, block.body, EXECUTION_ENGINE)
|
|
process_randao(state, block.body)
|
|
process_eth1_data(state, block.body)
|
|
process_operations(state, block.body) # [Modified in EIP7251]
|
|
process_sync_aggregate(state, block.body.sync_aggregate)
|
|
```
|
|
|
|
##### Updated `get_expected_withdrawals`
|
|
|
|
```python
|
|
def get_expected_withdrawals(state: BeaconState) -> Tuple[Sequence[Withdrawal], uint64]:
|
|
epoch = get_current_epoch(state)
|
|
withdrawal_index = state.next_withdrawal_index
|
|
validator_index = state.next_withdrawal_validator_index
|
|
withdrawals: List[Withdrawal] = []
|
|
|
|
# [New in EIP7251] Consume pending partial withdrawals
|
|
for withdrawal in state.pending_partial_withdrawals:
|
|
if withdrawal.withdrawable_epoch > epoch or len(withdrawals) == MAX_PARTIAL_WITHDRAWALS_PER_PAYLOAD:
|
|
break
|
|
|
|
validator = state.validators[withdrawal.index]
|
|
has_sufficient_effective_balance = validator.effective_balance == MIN_ACTIVATION_BALANCE
|
|
has_excess_balance = state.balances[withdrawal.index] > MIN_ACTIVATION_BALANCE
|
|
if validator.exit_epoch == FAR_FUTURE_EPOCH and has_sufficient_effective_balance and has_excess_balance:
|
|
withdrawable_balance = min(state.balances[withdrawal.index] - MIN_ACTIVATION_BALANCE, withdrawal.amount)
|
|
withdrawals.append(Withdrawal(
|
|
index=withdrawal_index,
|
|
validator_index=withdrawal.index,
|
|
address=ExecutionAddress(validator.withdrawal_credentials[12:]),
|
|
amount=withdrawable_balance,
|
|
))
|
|
withdrawal_index += WithdrawalIndex(1)
|
|
|
|
partial_withdrawals_count = len(withdrawals)
|
|
# END: Consume pending partial withdrawals
|
|
|
|
# Sweep for remaining.
|
|
bound = min(len(state.validators), MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP)
|
|
for _ in range(bound):
|
|
validator = state.validators[validator_index]
|
|
balance = state.balances[validator_index]
|
|
if is_fully_withdrawable_validator(validator, balance, epoch):
|
|
withdrawals.append(Withdrawal(
|
|
index=withdrawal_index,
|
|
validator_index=validator_index,
|
|
address=ExecutionAddress(validator.withdrawal_credentials[12:]),
|
|
amount=balance,
|
|
))
|
|
withdrawal_index += WithdrawalIndex(1)
|
|
elif is_partially_withdrawable_validator(validator, balance):
|
|
withdrawals.append(Withdrawal(
|
|
index=withdrawal_index,
|
|
validator_index=validator_index,
|
|
address=ExecutionAddress(validator.withdrawal_credentials[12:]),
|
|
amount=balance - get_validator_max_effective_balance(validator), # [Modified in EIP7251]
|
|
))
|
|
withdrawal_index += WithdrawalIndex(1)
|
|
if len(withdrawals) == MAX_WITHDRAWALS_PER_PAYLOAD:
|
|
break
|
|
validator_index = ValidatorIndex((validator_index + 1) % len(state.validators))
|
|
return withdrawals, partial_withdrawals_count
|
|
```
|
|
|
|
##### Updated `process_withdrawals`
|
|
|
|
```python
|
|
def process_withdrawals(state: BeaconState, payload: ExecutionPayload) -> None:
|
|
expected_withdrawals, partial_withdrawals_count = get_expected_withdrawals(state) # [Modified in EIP7251]
|
|
|
|
assert len(payload.withdrawals) == len(expected_withdrawals)
|
|
|
|
for expected_withdrawal, withdrawal in zip(expected_withdrawals, payload.withdrawals):
|
|
assert withdrawal == expected_withdrawal
|
|
decrease_balance(state, withdrawal.validator_index, withdrawal.amount)
|
|
|
|
# [New in EIP7251] update pending partial withdrawals
|
|
state.pending_partial_withdrawals = state.pending_partial_withdrawals[partial_withdrawals_count:]
|
|
|
|
# Update the next withdrawal index if this block contained withdrawals
|
|
if len(expected_withdrawals) != 0:
|
|
latest_withdrawal = expected_withdrawals[-1]
|
|
state.next_withdrawal_index = WithdrawalIndex(latest_withdrawal.index + 1)
|
|
|
|
# Update the next validator index to start the next withdrawal sweep
|
|
if len(expected_withdrawals) == MAX_WITHDRAWALS_PER_PAYLOAD:
|
|
# Next sweep starts after the latest withdrawal's validator index
|
|
next_validator_index = ValidatorIndex((expected_withdrawals[-1].validator_index + 1) % len(state.validators))
|
|
state.next_withdrawal_validator_index = next_validator_index
|
|
else:
|
|
# Advance sweep by the max length of the sweep if there was not a full set of withdrawals
|
|
next_index = state.next_withdrawal_validator_index + MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP
|
|
next_validator_index = ValidatorIndex(next_index % len(state.validators))
|
|
state.next_withdrawal_validator_index = next_validator_index
|
|
```
|
|
|
|
#### Operations
|
|
|
|
##### Updated `process_operations`
|
|
|
|
```python
|
|
def process_operations(state: BeaconState, body: BeaconBlockBody) -> None:
|
|
# Verify that outstanding deposits are processed up to the maximum number of deposits
|
|
assert len(body.deposits) == min(MAX_DEPOSITS, state.eth1_data.deposit_count - state.eth1_deposit_index)
|
|
|
|
def for_ops(operations: Sequence[Any], fn: Callable[[BeaconState, Any], None]) -> None:
|
|
for operation in operations:
|
|
fn(state, operation)
|
|
|
|
for_ops(body.proposer_slashings, process_proposer_slashing)
|
|
for_ops(body.attester_slashings, process_attester_slashing)
|
|
for_ops(body.attestations, process_attestation)
|
|
for_ops(body.deposits, process_deposit) # [Modified in EIP7251]
|
|
for_ops(body.voluntary_exits, process_voluntary_exit) # [Modified in EIP7251]
|
|
for_ops(body.bls_to_execution_changes, process_bls_to_execution_change)
|
|
for_ops(body.execution_payload.withdraw_requests, process_execution_layer_withdraw_request) # New in EIP7251
|
|
for_ops(body.consolidations, process_consolidation) # New in EIP7251
|
|
```
|
|
|
|
##### Deposits
|
|
|
|
###### Updated `apply_deposit`
|
|
|
|
```python
|
|
def apply_deposit(state: BeaconState,
|
|
pubkey: BLSPubkey,
|
|
withdrawal_credentials: Bytes32,
|
|
amount: uint64,
|
|
signature: BLSSignature) -> None:
|
|
validator_pubkeys = [v.pubkey for v in state.validators]
|
|
if pubkey not in validator_pubkeys:
|
|
# Verify the deposit signature (proof of possession) which is not checked by the deposit contract
|
|
if is_valid_deposit_signature(pubkey, withdrawal_credentials, amount, signature):
|
|
add_validator_to_registry(state, pubkey, withdrawal_credentials, amount)
|
|
else:
|
|
# Increase balance by deposit amount
|
|
index = ValidatorIndex(validator_pubkeys.index(pubkey))
|
|
state.pending_balance_deposits.append(
|
|
PendingBalanceDeposit(index=index, amount=amount)) # [Modified in EIP-7251]
|
|
# Check if valid deposit switch to compounding credentials
|
|
if (
|
|
is_compounding_withdrawal_credential(withdrawal_credentials)
|
|
and has_eth1_withdrawal_credential(state.validators[index])
|
|
and is_valid_deposit_signature(pubkey, withdrawal_credentials, amount, signature)
|
|
):
|
|
switch_to_compounding_validator(state, index)
|
|
|
|
```
|
|
|
|
###### New `is_valid_deposit_signature`
|
|
|
|
```python
|
|
def is_valid_deposit_signature(pubkey: BLSPubkey,
|
|
withdrawal_credentials: Bytes32,
|
|
amount: uint64,
|
|
signature: BLSSignature) -> None:
|
|
deposit_message = DepositMessage(
|
|
pubkey=pubkey,
|
|
withdrawal_credentials=withdrawal_credentials,
|
|
amount=amount,
|
|
)
|
|
domain = compute_domain(DOMAIN_DEPOSIT) # Fork-agnostic domain since deposits are valid across forks
|
|
signing_root = compute_signing_root(deposit_message, domain)
|
|
return bls.Verify(pubkey, signing_root, signature)
|
|
```
|
|
|
|
###### Modified `add_validator_to_registry`
|
|
|
|
```python
|
|
def add_validator_to_registry(state: BeaconState,
|
|
pubkey: BLSPubkey,
|
|
withdrawal_credentials: Bytes32,
|
|
amount: uint64) -> None:
|
|
index = get_index_for_new_validator(state)
|
|
validator = get_validator_from_deposit(pubkey, withdrawal_credentials)
|
|
set_or_append_list(state.validators, index, validator)
|
|
set_or_append_list(state.balances, index, 0) # [Modified in EIP7251]
|
|
set_or_append_list(state.previous_epoch_participation, index, ParticipationFlags(0b0000_0000))
|
|
set_or_append_list(state.current_epoch_participation, index, ParticipationFlags(0b0000_0000))
|
|
set_or_append_list(state.inactivity_scores, index, uint64(0))
|
|
state.pending_balance_deposits.append(PendingBalanceDeposit(index=index, amount=amount)) # [New in EIP7251]
|
|
```
|
|
|
|
###### Updated `get_validator_from_deposit`
|
|
|
|
```python
|
|
def get_validator_from_deposit(pubkey: BLSPubkey, withdrawal_credentials: Bytes32) -> Validator:
|
|
return Validator(
|
|
pubkey=pubkey,
|
|
withdrawal_credentials=withdrawal_credentials,
|
|
activation_eligibility_epoch=FAR_FUTURE_EPOCH,
|
|
activation_epoch=FAR_FUTURE_EPOCH,
|
|
exit_epoch=FAR_FUTURE_EPOCH,
|
|
withdrawable_epoch=FAR_FUTURE_EPOCH,
|
|
effective_balance=0, # [Modified in EIP7251]
|
|
)
|
|
```
|
|
|
|
##### Withdrawals
|
|
|
|
###### New `process_execution_layer_withdraw_request`
|
|
|
|
```python
|
|
def process_execution_layer_withdraw_request(
|
|
state: BeaconState,
|
|
execution_layer_withdraw_request: ExecutionLayerWithdrawRequest
|
|
) -> None:
|
|
amount = execution_layer_withdraw_request.amount
|
|
is_full_exit_request = amount == FULL_EXIT_REQUEST_AMOUNT
|
|
|
|
# If partial withdrawal queue is full, only full exits are processed
|
|
if len(state.pending_partial_withdrawals) >= PENDING_PARTIAL_WITHDRAWALS_LIMIT and not is_full_exit_request:
|
|
return
|
|
|
|
validator_pubkeys = [v.pubkey for v in state.validators]
|
|
index = ValidatorIndex(validator_pubkeys.index(execution_layer_withdraw_request.validator_pubkey))
|
|
validator = state.validators[index]
|
|
|
|
# Same conditions as in EIP-7002
|
|
if not (
|
|
has_execution_withdrawal_credential(validator)
|
|
# Verify withdrawal credentials
|
|
and validator.withdrawal_credentials[12:] == execution_layer_withdraw_request.source_address
|
|
# Verify the validator is active
|
|
and is_active_validator(validator, get_current_epoch(state))
|
|
# Verify exit has not been initiated, and slashed
|
|
and validator.exit_epoch == FAR_FUTURE_EPOCH
|
|
# Verify the validator has been active long enough
|
|
and get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
|
|
):
|
|
return
|
|
|
|
pending_balance_to_withdraw = get_pending_balance_to_withdraw(state, index)
|
|
|
|
if is_full_exit_request:
|
|
# Only exit validator if it has no pending withdrawals in the queue
|
|
if pending_balance_to_withdraw == 0:
|
|
initiate_validator_exit(state, index)
|
|
|
|
return
|
|
|
|
has_sufficient_effective_balance = validator.effective_balance >= MIN_ACTIVATION_BALANCE
|
|
has_excess_balance = state.balances[index] > MIN_ACTIVATION_BALANCE + pending_balance_to_withdraw
|
|
|
|
# Only allow partial withdrawals with compounding withdrawal credentials
|
|
if has_compounding_withdrawal_credential(validator) and has_sufficient_effective_balance and has_excess_balance:
|
|
to_withdraw = min(
|
|
state.balances[index] - MIN_ACTIVATION_BALANCE - pending_balance_to_withdraw,
|
|
amount
|
|
)
|
|
exit_queue_epoch = compute_exit_epoch_and_update_churn(state, to_withdraw)
|
|
withdrawable_epoch = Epoch(exit_queue_epoch + MIN_VALIDATOR_WITHDRAWABILITY_DELAY)
|
|
state.pending_partial_withdrawals.append(PendingPartialWithdrawal(
|
|
index=index,
|
|
amount=to_withdraw,
|
|
withdrawable_epoch=withdrawable_epoch,
|
|
))
|
|
```
|
|
|
|
##### Consolidations
|
|
|
|
###### New `process_consolidation`
|
|
|
|
```python
|
|
def process_consolidation(state: BeaconState, signed_consolidation: SignedConsolidation) -> None:
|
|
# If the pending consolidations queue is full, no consolidations are allowed in the block
|
|
assert len(state.pending_consolidations) < PENDING_CONSOLIDATIONS_LIMIT
|
|
# If there is too little available consolidation churn limit, no consolidations are allowed in the block
|
|
assert get_consolidation_churn_limit(state) > MIN_ACTIVATION_BALANCE
|
|
consolidation = signed_consolidation.message
|
|
# Verify that source != target, so a consolidation cannot be used as an exit.
|
|
assert consolidation.source_index != consolidation.target_index
|
|
|
|
source_validator = state.validators[consolidation.source_index]
|
|
target_validator = state.validators[consolidation.target_index]
|
|
# Verify the source and the target are active
|
|
current_epoch = get_current_epoch(state)
|
|
assert is_active_validator(source_validator, current_epoch)
|
|
assert is_active_validator(target_validator, current_epoch)
|
|
# Verify exits for source and target have not been initiated
|
|
assert source_validator.exit_epoch == FAR_FUTURE_EPOCH
|
|
assert target_validator.exit_epoch == FAR_FUTURE_EPOCH
|
|
# Consolidations must specify an epoch when they become valid; they are not valid before then
|
|
assert current_epoch >= consolidation.epoch
|
|
|
|
# Verify the source and the target have Execution layer withdrawal credentials
|
|
assert has_execution_withdrawal_credential(source_validator)
|
|
assert has_execution_withdrawal_credential(target_validator)
|
|
# Verify the same withdrawal address
|
|
assert source_validator.withdrawal_credentials[12:] == target_validator.withdrawal_credentials[12:]
|
|
|
|
# Verify consolidation is signed by the source and the target
|
|
domain = compute_domain(DOMAIN_CONSOLIDATION, genesis_validators_root=state.genesis_validators_root)
|
|
signing_root = compute_signing_root(consolidation, domain)
|
|
pubkeys = [source_validator.pubkey, target_validator.pubkey]
|
|
assert bls.FastAggregateVerify(pubkeys, signing_root, signed_consolidation.signature)
|
|
|
|
# Initiate source validator exit and append pending consolidation
|
|
source_validator.exit_epoch = compute_consolidation_epoch_and_update_churn(
|
|
state, source_validator.effective_balance)
|
|
source_validator.withdrawable_epoch = Epoch(
|
|
source_validator.exit_epoch + MIN_VALIDATOR_WITHDRAWABILITY_DELAY
|
|
)
|
|
state.pending_consolidations.append(PendingConsolidation(
|
|
source_index=consolidation.source_index,
|
|
target_index=consolidation.target_index
|
|
))
|
|
```
|
|
|
|
##### Voluntary exits
|
|
|
|
###### Updated `process_voluntary_exit`
|
|
|
|
```python
|
|
def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
|
|
voluntary_exit = signed_voluntary_exit.message
|
|
validator = state.validators[voluntary_exit.validator_index]
|
|
# Verify the validator is active
|
|
assert is_active_validator(validator, get_current_epoch(state))
|
|
# Verify exit has not been initiated
|
|
assert validator.exit_epoch == FAR_FUTURE_EPOCH
|
|
# Exits must specify an epoch when they become valid; they are not valid before then
|
|
assert get_current_epoch(state) >= voluntary_exit.epoch
|
|
# Verify the validator has been active long enough
|
|
assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
|
|
# Verify signature
|
|
domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
|
|
signing_root = compute_signing_root(voluntary_exit, domain)
|
|
assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
|
|
# Only exit validator if it has no pending withdrawals in the queue
|
|
assert get_pending_balance_to_withdraw(state, voluntary_exit.validator_index) == 0 # [New in EIP7251]
|
|
# Initiate exit
|
|
initiate_validator_exit(state, voluntary_exit.validator_index)
|
|
```
|