1517 lines
62 KiB
Markdown
1517 lines
62 KiB
Markdown
# Electra -- The Beacon Chain
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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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<!-- 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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- [Preset](#preset)
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- [Gwei values](#gwei-values)
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- [Rewards and penalties](#rewards-and-penalties)
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- [State list lengths](#state-list-lengths)
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- [Max operations per block](#max-operations-per-block)
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- [Execution](#execution)
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- [Withdrawals processing](#withdrawals-processing)
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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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- [`DepositRequest`](#depositrequest)
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- [`PendingBalanceDeposit`](#pendingbalancedeposit)
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- [`PendingPartialWithdrawal`](#pendingpartialwithdrawal)
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- [`WithdrawalRequest`](#withdrawalrequest)
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- [`ConsolidationRequest`](#consolidationrequest)
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- [`PendingConsolidation`](#pendingconsolidation)
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- [Modified Containers](#modified-containers)
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- [`AttesterSlashing`](#attesterslashing)
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- [Extended Containers](#extended-containers)
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- [`Attestation`](#attestation)
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- [`IndexedAttestation`](#indexedattestation)
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- [`BeaconBlockBody`](#beaconblockbody)
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- [`ExecutionPayload`](#executionpayload)
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- [`ExecutionPayloadHeader`](#executionpayloadheader)
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- [`BeaconState`](#beaconstate)
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- [Helper functions](#helper-functions)
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- [Predicates](#predicates)
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- [Modified `compute_proposer_index`](#modified-compute_proposer_index)
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- [Modified `is_eligible_for_activation_queue`](#modified-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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- [Modified `is_fully_withdrawable_validator`](#modified-is_fully_withdrawable_validator)
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- [Modified `is_partially_withdrawable_validator`](#modified-is_partially_withdrawable_validator)
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- [Misc](#misc-1)
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- [New `get_committee_indices`](#new-get_committee_indices)
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- [New `get_validator_max_effective_balance`](#new-get_validator_max_effective_balance)
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- [Beacon state accessors](#beacon-state-accessors)
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- [New `get_balance_churn_limit`](#new-get_balance_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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- [Modified `get_attesting_indices`](#modified-get_attesting_indices)
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- [Modified `get_next_sync_committee_indices`](#modified-get_next_sync_committee_indices)
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- [Beacon state mutators](#beacon-state-mutators)
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- [Modified `initiate_validator_exit`](#modified-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 `queue_entire_balance_and_reset_validator`](#new-queue_entire_balance_and_reset_validator)
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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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- [Modified `slash_validator`](#modified-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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- [Modified `process_epoch`](#modified-process_epoch)
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- [Modified `process_registry_updates`](#modified-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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- [Modified `process_effective_balance_updates`](#modified-process_effective_balance_updates)
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- [Block processing](#block-processing)
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- [Withdrawals](#withdrawals)
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- [Modified `get_expected_withdrawals`](#modified-get_expected_withdrawals)
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- [Modified `process_withdrawals`](#modified-process_withdrawals)
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- [Execution payload](#execution-payload)
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- [Modified `process_execution_payload`](#modified-process_execution_payload)
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- [Operations](#operations)
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- [Modified `process_operations`](#modified-process_operations)
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- [Attestations](#attestations)
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- [Modified `process_attestation`](#modified-process_attestation)
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- [Deposits](#deposits)
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- [Modified `apply_deposit`](#modified-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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- [Modified `get_validator_from_deposit`](#modified-get_validator_from_deposit)
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- [Voluntary exits](#voluntary-exits)
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- [Modified `process_voluntary_exit`](#modified-process_voluntary_exit)
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- [Execution layer withdrawal requests](#execution-layer-withdrawal-requests)
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- [New `process_withdrawal_request`](#new-process_withdrawal_request)
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- [Deposit requests](#deposit-requests)
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- [New `process_deposit_request`](#new-process_deposit_request)
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- [Execution layer consolidation requests](#execution-layer-consolidation-requests)
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- [New `process_consolidation_request`](#new-process_consolidation_request)
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- [Testing](#testing)
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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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Electra is a consensus-layer upgrade containing a number of features. Including:
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* [EIP-6110](https://eips.ethereum.org/EIPS/eip-6110): Supply validator deposits on chain
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* [EIP-7002](https://eips.ethereum.org/EIPS/eip-7002): Execution layer triggerable exits
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* [EIP-7251](https://eips.ethereum.org/EIPS/eip-7251): Increase the MAX_EFFECTIVE_BALANCE
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* [EIP-7549](https://eips.ethereum.org/EIPS/eip-7549): Move committee index outside Attestation
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*Note:* This specification is built upon [Deneb](../deneb/beacon_chain.md) and is under active development.
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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 | Description |
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| `UNSET_DEPOSIT_REQUESTS_START_INDEX` | `uint64(2**64 - 1)` | *[New in Electra:EIP6110]* |
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| `FULL_EXIT_REQUEST_AMOUNT` | `uint64(0)` | *[New in Electra:EIP7002]* |
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### Withdrawal prefixes
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| Name | Value |
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| - | - |
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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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## Preset
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### Gwei values
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| Name | Value |
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| `MIN_ACTIVATION_BALANCE` | `Gwei(2**5 * 10**9)` (= 32,000,000,000) |
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| `MAX_EFFECTIVE_BALANCE_ELECTRA` | `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_ELECTRA` | `uint64(2**12)` (= 4,096) |
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| `WHISTLEBLOWER_REWARD_QUOTIENT_ELECTRA` | `uint64(2**12)` (= 4,096) |
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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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### Max operations per block
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| Name | Value |
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| - | - |
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| `MAX_ATTESTER_SLASHINGS_ELECTRA` | `2**0` (= 1) | *[New in Electra:EIP7549]* |
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| `MAX_ATTESTATIONS_ELECTRA` | `2**3` (= 8) | *[New in Electra:EIP7549]* |
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### Execution
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| Name | Value | Description |
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| - | - | - |
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| `MAX_DEPOSIT_REQUESTS_PER_PAYLOAD` | `uint64(2**13)` (= 8,192) | *[New in Electra:EIP6110]* Maximum number of deposit receipts allowed in each payload |
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| `MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD` | `uint64(2**4)` (= 16)| *[New in Electra:EIP7002]* Maximum number of execution layer withdrawal requests in each payload |
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| `MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD` | `uint64(1)` (= 1) | *[New in Electra:EIP7002]* Maximum number of execution layer consolidation requests in each payload |
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### Withdrawals processing
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| Name | Value | Description |
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| - | - | - |
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| `MAX_PENDING_PARTIALS_PER_WITHDRAWALS_SWEEP` | `uint64(2**3)` (= 8)| *[New in Electra:EIP7002]* Maximum number of pending partial withdrawals to process per payload |
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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_ELECTRA` | `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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#### `DepositRequest`
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*Note*: The container is new in EIP6110.
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```python
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class DepositRequest(Container):
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pubkey: BLSPubkey
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withdrawal_credentials: Bytes32
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amount: Gwei
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signature: BLSSignature
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index: uint64
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```
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#### `PendingBalanceDeposit`
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*Note*: The container is new in EIP7251.
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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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#### `PendingPartialWithdrawal`
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*Note*: The container is new in EIP7251.
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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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#### `WithdrawalRequest`
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*Note*: The container is new in EIP7251:EIP7002.
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```python
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class WithdrawalRequest(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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#### `ConsolidationRequest`
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*Note*: The container is new in EIP7251.
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```python
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class ConsolidationRequest(Container):
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source_address: ExecutionAddress
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source_pubkey: BLSPubkey
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target_pubkey: BLSPubkey
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```
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#### `PendingConsolidation`
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*Note*: The container is new in EIP7251.
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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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### Modified Containers
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#### `AttesterSlashing`
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```python
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class AttesterSlashing(Container):
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attestation_1: IndexedAttestation # [Modified in Electra:EIP7549]
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attestation_2: IndexedAttestation # [Modified in Electra:EIP7549]
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```
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### Extended Containers
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#### `Attestation`
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```python
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class Attestation(Container):
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aggregation_bits: Bitlist[MAX_VALIDATORS_PER_COMMITTEE * MAX_COMMITTEES_PER_SLOT] # [Modified in Electra:EIP7549]
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data: AttestationData
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signature: BLSSignature
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committee_bits: Bitvector[MAX_COMMITTEES_PER_SLOT] # [New in Electra:EIP7549]
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```
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#### `IndexedAttestation`
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```python
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class IndexedAttestation(Container):
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# [Modified in Electra:EIP7549]
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attesting_indices: List[ValidatorIndex, MAX_VALIDATORS_PER_COMMITTEE * MAX_COMMITTEES_PER_SLOT]
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data: AttestationData
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signature: BLSSignature
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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_ELECTRA] # [Modified in Electra:EIP7549]
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attestations: List[Attestation, MAX_ATTESTATIONS_ELECTRA] # [Modified in Electra:EIP7549]
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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 # [Modified in Electra:EIP6110:EIP7002]
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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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```
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#### `ExecutionPayload`
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```python
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class ExecutionPayload(Container):
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# Execution block header fields
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parent_hash: Hash32
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fee_recipient: ExecutionAddress
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state_root: Bytes32
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receipts_root: Bytes32
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logs_bloom: ByteVector[BYTES_PER_LOGS_BLOOM]
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prev_randao: Bytes32
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block_number: uint64
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gas_limit: uint64
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gas_used: uint64
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timestamp: uint64
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extra_data: ByteList[MAX_EXTRA_DATA_BYTES]
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base_fee_per_gas: uint256
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# Extra payload fields
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block_hash: Hash32
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transactions: List[Transaction, MAX_TRANSACTIONS_PER_PAYLOAD]
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withdrawals: List[Withdrawal, MAX_WITHDRAWALS_PER_PAYLOAD]
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blob_gas_used: uint64
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excess_blob_gas: uint64
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deposit_requests: List[DepositRequest, MAX_DEPOSIT_REQUESTS_PER_PAYLOAD] # [New in Electra:EIP6110]
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# [New in Electra:EIP7002:EIP7251]
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withdrawal_requests: List[WithdrawalRequest, MAX_WITHDRAWAL_REQUESTS_PER_PAYLOAD]
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# [New in Electra:EIP7251]
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consolidation_requests: List[ConsolidationRequest, MAX_CONSOLIDATION_REQUESTS_PER_PAYLOAD]
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```
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#### `ExecutionPayloadHeader`
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```python
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class ExecutionPayloadHeader(Container):
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# Execution block header fields
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parent_hash: Hash32
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fee_recipient: ExecutionAddress
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state_root: Bytes32
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receipts_root: Bytes32
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logs_bloom: ByteVector[BYTES_PER_LOGS_BLOOM]
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prev_randao: Bytes32
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block_number: uint64
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gas_limit: uint64
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gas_used: uint64
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timestamp: uint64
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extra_data: ByteList[MAX_EXTRA_DATA_BYTES]
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base_fee_per_gas: uint256
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# Extra payload fields
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block_hash: Hash32
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transactions_root: Root
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withdrawals_root: Root
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blob_gas_used: uint64
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excess_blob_gas: uint64
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deposit_requests_root: Root # [New in Electra:EIP6110]
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withdrawal_requests_root: Root # [New in Electra:EIP7002:EIP7251]
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consolidation_requests_root: Root # [New in Electra:EIP7251]
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```
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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 # [Modified in Electra:EIP6110:EIP7002]
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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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deposit_requests_start_index: uint64 # [New in Electra:EIP6110]
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deposit_balance_to_consume: Gwei # [New in Electra:EIP7251]
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exit_balance_to_consume: Gwei # [New in Electra:EIP7251]
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earliest_exit_epoch: Epoch # [New in Electra:EIP7251]
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consolidation_balance_to_consume: Gwei # [New in Electra:EIP7251]
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earliest_consolidation_epoch: Epoch # [New in Electra:EIP7251]
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pending_balance_deposits: List[PendingBalanceDeposit, PENDING_BALANCE_DEPOSITS_LIMIT] # [New in Electra:EIP7251]
|
|
# [New in Electra:EIP7251]
|
|
pending_partial_withdrawals: List[PendingPartialWithdrawal, PENDING_PARTIAL_WITHDRAWALS_LIMIT]
|
|
pending_consolidations: List[PendingConsolidation, PENDING_CONSOLIDATIONS_LIMIT] # [New in Electra:EIP7251]
|
|
```
|
|
|
|
## Helper functions
|
|
|
|
### Predicates
|
|
|
|
#### Modified `compute_proposer_index`
|
|
|
|
*Note*: The function `compute_proposer_index` is modified to use `MAX_EFFECTIVE_BALANCE_ELECTRA`.
|
|
|
|
```python
|
|
def compute_proposer_index(state: BeaconState, indices: Sequence[ValidatorIndex], seed: Bytes32) -> ValidatorIndex:
|
|
"""
|
|
Return from ``indices`` a random index sampled by effective balance.
|
|
"""
|
|
assert len(indices) > 0
|
|
MAX_RANDOM_BYTE = 2**8 - 1
|
|
i = uint64(0)
|
|
total = uint64(len(indices))
|
|
while True:
|
|
candidate_index = indices[compute_shuffled_index(i % total, total, seed)]
|
|
random_byte = hash(seed + uint_to_bytes(uint64(i // 32)))[i % 32]
|
|
effective_balance = state.validators[candidate_index].effective_balance
|
|
# [Modified in Electra:EIP7251]
|
|
if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE_ELECTRA * random_byte:
|
|
return candidate_index
|
|
i += 1
|
|
```
|
|
|
|
#### Modified `is_eligible_for_activation_queue`
|
|
|
|
*Note*: The function `is_eligible_for_activation_queue` is modified to use `MIN_ACTIVATION_BALANCE` instead of `MAX_EFFECTIVE_BALANCE`.
|
|
|
|
```python
|
|
def is_eligible_for_activation_queue(validator: Validator) -> bool:
|
|
"""
|
|
Check if ``validator`` is eligible to be placed into the activation queue.
|
|
"""
|
|
return (
|
|
validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH
|
|
and validator.effective_balance >= MIN_ACTIVATION_BALANCE # [Modified in Electra:EIP7251]
|
|
)
|
|
```
|
|
|
|
#### New `is_compounding_withdrawal_credential`
|
|
|
|
```python
|
|
def is_compounding_withdrawal_credential(withdrawal_credentials: Bytes32) -> bool:
|
|
return withdrawal_credentials[:1] == COMPOUNDING_WITHDRAWAL_PREFIX
|
|
```
|
|
|
|
#### New `has_compounding_withdrawal_credential`
|
|
|
|
```python
|
|
def has_compounding_withdrawal_credential(validator: Validator) -> bool:
|
|
"""
|
|
Check if ``validator`` has an 0x02 prefixed "compounding" withdrawal credential.
|
|
"""
|
|
return is_compounding_withdrawal_credential(validator.withdrawal_credentials)
|
|
```
|
|
|
|
#### New `has_execution_withdrawal_credential`
|
|
|
|
```python
|
|
def has_execution_withdrawal_credential(validator: Validator) -> bool:
|
|
"""
|
|
Check if ``validator`` has a 0x01 or 0x02 prefixed withdrawal credential.
|
|
"""
|
|
return has_compounding_withdrawal_credential(validator) or has_eth1_withdrawal_credential(validator)
|
|
```
|
|
|
|
#### Modified `is_fully_withdrawable_validator`
|
|
|
|
*Note*: The function `is_fully_withdrawable_validator` is modified to use `has_execution_withdrawal_credential` instead of `has_eth1_withdrawal_credential`.
|
|
|
|
```python
|
|
def is_fully_withdrawable_validator(validator: Validator, balance: Gwei, epoch: Epoch) -> bool:
|
|
"""
|
|
Check if ``validator`` is fully withdrawable.
|
|
"""
|
|
return (
|
|
has_execution_withdrawal_credential(validator) # [Modified in Electra:EIP7251]
|
|
and validator.withdrawable_epoch <= epoch
|
|
and balance > 0
|
|
)
|
|
```
|
|
|
|
#### Modified `is_partially_withdrawable_validator`
|
|
|
|
*Note*: The function `is_partially_withdrawable_validator` is modified to use `get_validator_max_effective_balance` instead of `MAX_EFFECTIVE_BALANCE` and `has_execution_withdrawal_credential` instead of `has_eth1_withdrawal_credential`.
|
|
|
|
```python
|
|
def is_partially_withdrawable_validator(validator: Validator, balance: Gwei) -> bool:
|
|
"""
|
|
Check if ``validator`` is partially withdrawable.
|
|
"""
|
|
max_effective_balance = get_validator_max_effective_balance(validator)
|
|
has_max_effective_balance = validator.effective_balance == max_effective_balance # [Modified in Electra:EIP7251]
|
|
has_excess_balance = balance > max_effective_balance # [Modified in Electra:EIP7251]
|
|
return (
|
|
has_execution_withdrawal_credential(validator) # [Modified in Electra:EIP7251]
|
|
and has_max_effective_balance
|
|
and has_excess_balance
|
|
)
|
|
```
|
|
|
|
### Misc
|
|
|
|
#### New `get_committee_indices`
|
|
|
|
```python
|
|
def get_committee_indices(committee_bits: Bitvector) -> Sequence[CommitteeIndex]:
|
|
return [CommitteeIndex(index) for index, bit in enumerate(committee_bits) if bit]
|
|
```
|
|
|
|
#### New `get_validator_max_effective_balance`
|
|
|
|
```python
|
|
def get_validator_max_effective_balance(validator: Validator) -> Gwei:
|
|
"""
|
|
Get max effective balance for ``validator``.
|
|
"""
|
|
if has_compounding_withdrawal_credential(validator):
|
|
return MAX_EFFECTIVE_BALANCE_ELECTRA
|
|
else:
|
|
return MIN_ACTIVATION_BALANCE
|
|
```
|
|
|
|
### Beacon state accessors
|
|
|
|
#### New `get_balance_churn_limit`
|
|
|
|
```python
|
|
def get_balance_churn_limit(state: BeaconState) -> Gwei:
|
|
"""
|
|
Return the churn limit for the current epoch.
|
|
"""
|
|
churn = max(
|
|
MIN_PER_EPOCH_CHURN_LIMIT_ELECTRA,
|
|
get_total_active_balance(state) // CHURN_LIMIT_QUOTIENT
|
|
)
|
|
return churn - churn % EFFECTIVE_BALANCE_INCREMENT
|
|
```
|
|
|
|
#### New `get_activation_exit_churn_limit`
|
|
|
|
```python
|
|
def get_activation_exit_churn_limit(state: BeaconState) -> Gwei:
|
|
"""
|
|
Return the churn limit for the current epoch dedicated to activations and exits.
|
|
"""
|
|
return min(MAX_PER_EPOCH_ACTIVATION_EXIT_CHURN_LIMIT, get_balance_churn_limit(state))
|
|
```
|
|
|
|
#### New `get_consolidation_churn_limit`
|
|
|
|
```python
|
|
def get_consolidation_churn_limit(state: BeaconState) -> Gwei:
|
|
return get_balance_churn_limit(state) - get_activation_exit_churn_limit(state)
|
|
```
|
|
|
|
#### New `get_active_balance`
|
|
|
|
```python
|
|
def get_active_balance(state: BeaconState, validator_index: ValidatorIndex) -> Gwei:
|
|
max_effective_balance = get_validator_max_effective_balance(state.validators[validator_index])
|
|
return min(state.balances[validator_index], max_effective_balance)
|
|
```
|
|
|
|
#### New `get_pending_balance_to_withdraw`
|
|
|
|
```python
|
|
def get_pending_balance_to_withdraw(state: BeaconState, validator_index: ValidatorIndex) -> Gwei:
|
|
return sum(
|
|
withdrawal.amount for withdrawal in state.pending_partial_withdrawals if withdrawal.index == validator_index
|
|
)
|
|
```
|
|
|
|
#### Modified `get_attesting_indices`
|
|
|
|
*Note*: The function `get_attesting_indices` is modified to support EIP7549.
|
|
|
|
```python
|
|
def get_attesting_indices(state: BeaconState, attestation: Attestation) -> Set[ValidatorIndex]:
|
|
"""
|
|
Return the set of attesting indices corresponding to ``aggregation_bits`` and ``committee_bits``.
|
|
"""
|
|
output: Set[ValidatorIndex] = set()
|
|
committee_indices = get_committee_indices(attestation.committee_bits)
|
|
committee_offset = 0
|
|
for index in committee_indices:
|
|
committee = get_beacon_committee(state, attestation.data.slot, index)
|
|
committee_attesters = set(
|
|
index for i, index in enumerate(committee) if attestation.aggregation_bits[committee_offset + i])
|
|
output = output.union(committee_attesters)
|
|
|
|
committee_offset += len(committee)
|
|
|
|
return output
|
|
```
|
|
|
|
#### Modified `get_next_sync_committee_indices`
|
|
|
|
*Note*: The function `get_next_sync_committee_indices` is modified to use `MAX_EFFECTIVE_BALANCE_ELECTRA`.
|
|
|
|
```python
|
|
def get_next_sync_committee_indices(state: BeaconState) -> Sequence[ValidatorIndex]:
|
|
"""
|
|
Return the sync committee indices, with possible duplicates, for the next sync committee.
|
|
"""
|
|
epoch = Epoch(get_current_epoch(state) + 1)
|
|
|
|
MAX_RANDOM_BYTE = 2**8 - 1
|
|
active_validator_indices = get_active_validator_indices(state, epoch)
|
|
active_validator_count = uint64(len(active_validator_indices))
|
|
seed = get_seed(state, epoch, DOMAIN_SYNC_COMMITTEE)
|
|
i = 0
|
|
sync_committee_indices: List[ValidatorIndex] = []
|
|
while len(sync_committee_indices) < SYNC_COMMITTEE_SIZE:
|
|
shuffled_index = compute_shuffled_index(uint64(i % active_validator_count), active_validator_count, seed)
|
|
candidate_index = active_validator_indices[shuffled_index]
|
|
random_byte = hash(seed + uint_to_bytes(uint64(i // 32)))[i % 32]
|
|
effective_balance = state.validators[candidate_index].effective_balance
|
|
# [Modified in Electra:EIP7251]
|
|
if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE_ELECTRA * random_byte:
|
|
sync_committee_indices.append(candidate_index)
|
|
i += 1
|
|
return sync_committee_indices
|
|
```
|
|
|
|
### Beacon state mutators
|
|
|
|
#### Modified `initiate_validator_exit`
|
|
|
|
*Note*: The function `initiate_validator_exit` is modified to use the new `compute_exit_epoch_and_update_churn` function.
|
|
|
|
```python
|
|
def initiate_validator_exit(state: BeaconState, index: ValidatorIndex) -> None:
|
|
"""
|
|
Initiate the exit of the validator with index ``index``.
|
|
"""
|
|
# Return if validator already initiated exit
|
|
validator = state.validators[index]
|
|
if validator.exit_epoch != FAR_FUTURE_EPOCH:
|
|
return
|
|
|
|
# Compute exit queue epoch [Modified in Electra:EIP7251]
|
|
exit_queue_epoch = compute_exit_epoch_and_update_churn(state, validator.effective_balance)
|
|
|
|
# Set validator exit epoch and withdrawable epoch
|
|
validator.exit_epoch = exit_queue_epoch
|
|
validator.withdrawable_epoch = Epoch(validator.exit_epoch + MIN_VALIDATOR_WITHDRAWABILITY_DELAY)
|
|
```
|
|
|
|
#### 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 = COMPOUNDING_WITHDRAWAL_PREFIX + validator.withdrawal_credentials[1:]
|
|
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 `queue_entire_balance_and_reset_validator`
|
|
|
|
```python
|
|
def queue_entire_balance_and_reset_validator(state: BeaconState, index: ValidatorIndex) -> None:
|
|
balance = state.balances[index]
|
|
state.balances[index] = 0
|
|
validator = state.validators[index]
|
|
validator.effective_balance = 0
|
|
validator.activation_eligibility_epoch = FAR_FUTURE_EPOCH
|
|
state.pending_balance_deposits.append(
|
|
PendingBalanceDeposit(index=index, amount=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 = max(state.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:
|
|
exit_balance_to_consume = per_epoch_churn
|
|
else:
|
|
exit_balance_to_consume = state.exit_balance_to_consume
|
|
|
|
# Exit doesn't fit in the current earliest epoch.
|
|
if exit_balance > exit_balance_to_consume:
|
|
balance_to_process = exit_balance - exit_balance_to_consume
|
|
additional_epochs = (balance_to_process - 1) // per_epoch_churn + 1
|
|
earliest_exit_epoch += additional_epochs
|
|
exit_balance_to_consume += additional_epochs * per_epoch_churn
|
|
|
|
# Consume the balance and update state variables.
|
|
state.exit_balance_to_consume = exit_balance_to_consume - exit_balance
|
|
state.earliest_exit_epoch = earliest_exit_epoch
|
|
|
|
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 = max(
|
|
state.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:
|
|
consolidation_balance_to_consume = per_epoch_consolidation_churn
|
|
else:
|
|
consolidation_balance_to_consume = state.consolidation_balance_to_consume
|
|
|
|
# Consolidation doesn't fit in the current earliest epoch.
|
|
if consolidation_balance > consolidation_balance_to_consume:
|
|
balance_to_process = consolidation_balance - consolidation_balance_to_consume
|
|
additional_epochs = (balance_to_process - 1) // per_epoch_consolidation_churn + 1
|
|
earliest_consolidation_epoch += additional_epochs
|
|
consolidation_balance_to_consume += additional_epochs * per_epoch_consolidation_churn
|
|
|
|
# Consume the balance and update state variables.
|
|
state.consolidation_balance_to_consume = consolidation_balance_to_consume - consolidation_balance
|
|
state.earliest_consolidation_epoch = earliest_consolidation_epoch
|
|
|
|
return state.earliest_consolidation_epoch
|
|
```
|
|
|
|
#### Modified `slash_validator`
|
|
|
|
*Note*: The function `slash_validator` is modified to change how the slashing penalty and proposer/whistleblower rewards are calculated in accordance with EIP7251.
|
|
|
|
```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
|
|
# [Modified in Electra:EIP7251]
|
|
slashing_penalty = validator.effective_balance // MIN_SLASHING_PENALTY_QUOTIENT_ELECTRA
|
|
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_ELECTRA) # [Modified in Electra: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
|
|
|
|
#### Modified `process_epoch`
|
|
|
|
*Note*: The function `process_epoch` is modified to call updated functions and to process pending balance deposits and pending consolidations which are new in Electra.
|
|
|
|
```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 Electra:EIP7251]
|
|
process_slashings(state)
|
|
process_eth1_data_reset(state)
|
|
process_pending_balance_deposits(state) # [New in Electra:EIP7251]
|
|
process_pending_consolidations(state) # [New in Electra:EIP7251]
|
|
process_effective_balance_updates(state) # [Modified in Electra:EIP7251]
|
|
process_slashings_reset(state)
|
|
process_randao_mixes_reset(state)
|
|
process_historical_summaries_update(state)
|
|
process_participation_flag_updates(state)
|
|
process_sync_committee_updates(state)
|
|
```
|
|
|
|
#### Modified `process_registry_updates`
|
|
|
|
*Note*: The function `process_registry_updates` is modified to use the updated definition of `initiate_validator_exit`
|
|
and changes how the activation epochs are computed for eligible validators.
|
|
|
|
```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:
|
|
next_epoch = Epoch(get_current_epoch(state) + 1)
|
|
available_for_processing = state.deposit_balance_to_consume + get_activation_exit_churn_limit(state)
|
|
processed_amount = 0
|
|
next_deposit_index = 0
|
|
deposits_to_postpone = []
|
|
|
|
for deposit in state.pending_balance_deposits:
|
|
validator = state.validators[deposit.index]
|
|
# Validator is exiting, postpone the deposit until after withdrawable epoch
|
|
if validator.exit_epoch < FAR_FUTURE_EPOCH:
|
|
if next_epoch <= validator.withdrawable_epoch:
|
|
deposits_to_postpone.append(deposit)
|
|
# Deposited balance will never become active. Increase balance but do not consume churn
|
|
else:
|
|
increase_balance(state, deposit.index, deposit.amount)
|
|
# Validator is not exiting, attempt to process deposit
|
|
else:
|
|
# Deposit does not fit in the churn, no more deposit processing in this epoch.
|
|
if processed_amount + deposit.amount > available_for_processing:
|
|
break
|
|
# Deposit fits in the churn, process it. Increase balance and consume churn.
|
|
else:
|
|
increase_balance(state, deposit.index, deposit.amount)
|
|
processed_amount += deposit.amount
|
|
# Regardless of how the deposit was handled, we move on in the queue.
|
|
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 = Gwei(0)
|
|
else:
|
|
state.deposit_balance_to_consume = available_for_processing - processed_amount
|
|
|
|
state.pending_balance_deposits += deposits_to_postpone
|
|
```
|
|
|
|
#### New `process_pending_consolidations`
|
|
|
|
```python
|
|
def process_pending_consolidations(state: BeaconState) -> None:
|
|
next_epoch = Epoch(get_current_epoch(state) + 1)
|
|
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 > next_epoch:
|
|
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:]
|
|
```
|
|
|
|
#### Modified `process_effective_balance_updates`
|
|
|
|
*Note*: The function `process_effective_balance_updates` is modified to use the new limit for the maximum effective balance.
|
|
|
|
```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
|
|
# [Modified in Electra:EIP7251]
|
|
EFFECTIVE_BALANCE_LIMIT = (
|
|
MAX_EFFECTIVE_BALANCE_ELECTRA 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 Electra:EIP7251]
|
|
process_execution_payload(state, block.body, EXECUTION_ENGINE) # [Modified in Electra:EIP6110]
|
|
process_randao(state, block.body)
|
|
process_eth1_data(state, block.body)
|
|
process_operations(state, block.body) # [Modified in Electra:EIP6110:EIP7002:EIP7549:EIP7251]
|
|
process_sync_aggregate(state, block.body.sync_aggregate)
|
|
```
|
|
|
|
#### Withdrawals
|
|
|
|
##### Modified `get_expected_withdrawals`
|
|
|
|
*Note*: The function `get_expected_withdrawals` is modified to support EIP7251.
|
|
|
|
```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 Electra:EIP7251] Consume pending partial withdrawals
|
|
for withdrawal in state.pending_partial_withdrawals:
|
|
if withdrawal.withdrawable_epoch > epoch or len(withdrawals) == MAX_PENDING_PARTIALS_PER_WITHDRAWALS_SWEEP:
|
|
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)
|
|
|
|
# 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 Electra: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
|
|
```
|
|
|
|
##### Modified `process_withdrawals`
|
|
|
|
*Note*: The function `process_withdrawals` is modified to support EIP7251.
|
|
|
|
```python
|
|
def process_withdrawals(state: BeaconState, payload: ExecutionPayload) -> None:
|
|
expected_withdrawals, partial_withdrawals_count = get_expected_withdrawals(state) # [Modified in Electra: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)
|
|
|
|
# Update pending partial withdrawals [New in Electra:EIP7251]
|
|
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
|
|
```
|
|
|
|
#### Execution payload
|
|
|
|
##### Modified `process_execution_payload`
|
|
|
|
*Note*: The function `process_execution_payload` is modified to use the new `ExecutionPayloadHeader` type.
|
|
|
|
```python
|
|
def process_execution_payload(state: BeaconState, body: BeaconBlockBody, execution_engine: ExecutionEngine) -> None:
|
|
payload = body.execution_payload
|
|
|
|
# Verify consistency of the parent hash with respect to the previous execution payload header
|
|
assert payload.parent_hash == state.latest_execution_payload_header.block_hash
|
|
# Verify prev_randao
|
|
assert payload.prev_randao == get_randao_mix(state, get_current_epoch(state))
|
|
# Verify timestamp
|
|
assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
|
|
# Verify commitments are under limit
|
|
assert len(body.blob_kzg_commitments) <= MAX_BLOBS_PER_BLOCK
|
|
# Verify the execution payload is valid
|
|
versioned_hashes = [kzg_commitment_to_versioned_hash(commitment) for commitment in body.blob_kzg_commitments]
|
|
assert execution_engine.verify_and_notify_new_payload(
|
|
NewPayloadRequest(
|
|
execution_payload=payload,
|
|
versioned_hashes=versioned_hashes,
|
|
parent_beacon_block_root=state.latest_block_header.parent_root,
|
|
)
|
|
)
|
|
# Cache execution payload header
|
|
state.latest_execution_payload_header = ExecutionPayloadHeader(
|
|
parent_hash=payload.parent_hash,
|
|
fee_recipient=payload.fee_recipient,
|
|
state_root=payload.state_root,
|
|
receipts_root=payload.receipts_root,
|
|
logs_bloom=payload.logs_bloom,
|
|
prev_randao=payload.prev_randao,
|
|
block_number=payload.block_number,
|
|
gas_limit=payload.gas_limit,
|
|
gas_used=payload.gas_used,
|
|
timestamp=payload.timestamp,
|
|
extra_data=payload.extra_data,
|
|
base_fee_per_gas=payload.base_fee_per_gas,
|
|
block_hash=payload.block_hash,
|
|
transactions_root=hash_tree_root(payload.transactions),
|
|
withdrawals_root=hash_tree_root(payload.withdrawals),
|
|
blob_gas_used=payload.blob_gas_used,
|
|
excess_blob_gas=payload.excess_blob_gas,
|
|
deposit_requests_root=hash_tree_root(payload.deposit_requests), # [New in Electra:EIP6110]
|
|
withdrawal_requests_root=hash_tree_root(payload.withdrawal_requests), # [New in Electra:EIP7002:EIP7251]
|
|
consolidation_requests_root=hash_tree_root(payload.consolidation_requests), # [New in Electra:EIP7251]
|
|
)
|
|
```
|
|
|
|
#### Operations
|
|
|
|
##### Modified `process_operations`
|
|
|
|
*Note*: The function `process_operations` is modified to support all of the new functionality in Electra.
|
|
|
|
```python
|
|
def process_operations(state: BeaconState, body: BeaconBlockBody) -> None:
|
|
# [Modified in Electra:EIP6110]
|
|
# Disable former deposit mechanism once all prior deposits are processed
|
|
eth1_deposit_index_limit = min(state.eth1_data.deposit_count, state.deposit_requests_start_index)
|
|
if state.eth1_deposit_index < eth1_deposit_index_limit:
|
|
assert len(body.deposits) == min(MAX_DEPOSITS, eth1_deposit_index_limit - state.eth1_deposit_index)
|
|
else:
|
|
assert len(body.deposits) == 0
|
|
|
|
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) # [Modified in Electra:EIP7549]
|
|
for_ops(body.deposits, process_deposit) # [Modified in Electra:EIP7251]
|
|
for_ops(body.voluntary_exits, process_voluntary_exit) # [Modified in Electra:EIP7251]
|
|
for_ops(body.bls_to_execution_changes, process_bls_to_execution_change)
|
|
for_ops(body.execution_payload.deposit_requests, process_deposit_request) # [New in Electra:EIP6110]
|
|
# [New in Electra:EIP7002:EIP7251]
|
|
for_ops(body.execution_payload.withdrawal_requests, process_withdrawal_request)
|
|
# [New in Electra:EIP7251]
|
|
for_ops(body.execution_payload.consolidation_requests, process_consolidation_request)
|
|
```
|
|
|
|
##### Attestations
|
|
|
|
###### Modified `process_attestation`
|
|
|
|
```python
|
|
def process_attestation(state: BeaconState, attestation: Attestation) -> None:
|
|
data = attestation.data
|
|
assert data.target.epoch in (get_previous_epoch(state), get_current_epoch(state))
|
|
assert data.target.epoch == compute_epoch_at_slot(data.slot)
|
|
assert data.slot + MIN_ATTESTATION_INCLUSION_DELAY <= state.slot
|
|
|
|
# [Modified in Electra:EIP7549]
|
|
assert data.index == 0
|
|
committee_indices = get_committee_indices(attestation.committee_bits)
|
|
participants_count = 0
|
|
for index in committee_indices:
|
|
assert index < get_committee_count_per_slot(state, data.target.epoch)
|
|
committee = get_beacon_committee(state, data.slot, index)
|
|
participants_count += len(committee)
|
|
|
|
assert len(attestation.aggregation_bits) == participants_count
|
|
|
|
# Participation flag indices
|
|
participation_flag_indices = get_attestation_participation_flag_indices(state, data, state.slot - data.slot)
|
|
|
|
# Verify signature
|
|
assert is_valid_indexed_attestation(state, get_indexed_attestation(state, attestation))
|
|
|
|
# Update epoch participation flags
|
|
if data.target.epoch == get_current_epoch(state):
|
|
epoch_participation = state.current_epoch_participation
|
|
else:
|
|
epoch_participation = state.previous_epoch_participation
|
|
|
|
proposer_reward_numerator = 0
|
|
for index in get_attesting_indices(state, attestation):
|
|
for flag_index, weight in enumerate(PARTICIPATION_FLAG_WEIGHTS):
|
|
if flag_index in participation_flag_indices and not has_flag(epoch_participation[index], flag_index):
|
|
epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
|
|
proposer_reward_numerator += get_base_reward(state, index) * weight
|
|
|
|
# Reward proposer
|
|
proposer_reward_denominator = (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT) * WEIGHT_DENOMINATOR // PROPOSER_WEIGHT
|
|
proposer_reward = Gwei(proposer_reward_numerator // proposer_reward_denominator)
|
|
increase_balance(state, get_beacon_proposer_index(state), proposer_reward)
|
|
```
|
|
|
|
##### Deposits
|
|
|
|
###### Modified `apply_deposit`
|
|
|
|
*Note*: The function `process_deposit` is modified to support EIP7251.
|
|
|
|
```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 Electra:EIP7251]
|
|
# 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) -> bool:
|
|
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`
|
|
|
|
*Note*: The function `add_validator_to_registry` is modified to initialize the validator with a balance of zero and add a pending balance deposit to the queue.
|
|
|
|
```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 Electra: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 Electra:EIP7251]
|
|
```
|
|
|
|
###### Modified `get_validator_from_deposit`
|
|
|
|
*Note*: The function `get_validator_from_deposit` is modified to initialize the validator with an effective balance of zero.
|
|
|
|
```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 Electra:EIP7251]
|
|
)
|
|
```
|
|
|
|
##### Voluntary exits
|
|
|
|
###### Modified `process_voluntary_exit`
|
|
|
|
*Note*: The function `process_voluntary_exit` is modified to ensure the validator has no pending withdrawals in the queue.
|
|
|
|
```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
|
|
# 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 Electra:EIP7251]
|
|
# Verify signature
|
|
domain = compute_domain(DOMAIN_VOLUNTARY_EXIT, CAPELLA_FORK_VERSION, state.genesis_validators_root)
|
|
signing_root = compute_signing_root(voluntary_exit, domain)
|
|
assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
|
|
# Initiate exit
|
|
initiate_validator_exit(state, voluntary_exit.validator_index)
|
|
```
|
|
|
|
##### Execution layer withdrawal requests
|
|
|
|
###### New `process_withdrawal_request`
|
|
|
|
```python
|
|
def process_withdrawal_request(
|
|
state: BeaconState,
|
|
withdrawal_request: WithdrawalRequest
|
|
) -> None:
|
|
amount = withdrawal_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]
|
|
# Verify pubkey exists
|
|
request_pubkey = withdrawal_request.validator_pubkey
|
|
if request_pubkey not in validator_pubkeys:
|
|
return
|
|
index = ValidatorIndex(validator_pubkeys.index(request_pubkey))
|
|
validator = state.validators[index]
|
|
|
|
# Verify withdrawal credentials
|
|
has_correct_credential = has_execution_withdrawal_credential(validator)
|
|
is_correct_source_address = (
|
|
validator.withdrawal_credentials[12:] == withdrawal_request.source_address
|
|
)
|
|
if not (has_correct_credential and is_correct_source_address):
|
|
return
|
|
# Verify the validator is active
|
|
if not is_active_validator(validator, get_current_epoch(state)):
|
|
return
|
|
# Verify exit has not been initiated
|
|
if validator.exit_epoch != FAR_FUTURE_EPOCH:
|
|
return
|
|
# Verify the validator has been active long enough
|
|
if 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,
|
|
))
|
|
```
|
|
|
|
##### Deposit requests
|
|
|
|
###### New `process_deposit_request`
|
|
|
|
```python
|
|
def process_deposit_request(state: BeaconState, deposit_request: DepositRequest) -> None:
|
|
# Set deposit request start index
|
|
if state.deposit_requests_start_index == UNSET_DEPOSIT_REQUESTS_START_INDEX:
|
|
state.deposit_requests_start_index = deposit_request.index
|
|
|
|
apply_deposit(
|
|
state=state,
|
|
pubkey=deposit_request.pubkey,
|
|
withdrawal_credentials=deposit_request.withdrawal_credentials,
|
|
amount=deposit_request.amount,
|
|
signature=deposit_request.signature,
|
|
)
|
|
```
|
|
|
|
##### Execution layer consolidation requests
|
|
|
|
###### New `process_consolidation_request`
|
|
|
|
```python
|
|
def process_consolidation_request(
|
|
state: BeaconState,
|
|
consolidation_request: ConsolidationRequest
|
|
) -> None:
|
|
# If the pending consolidations queue is full, consolidation requests are ignored
|
|
if len(state.pending_consolidations) == PENDING_CONSOLIDATIONS_LIMIT:
|
|
return
|
|
# If there is too little available consolidation churn limit, consolidation requests are ignored
|
|
if get_consolidation_churn_limit(state) <= MIN_ACTIVATION_BALANCE:
|
|
return
|
|
|
|
validator_pubkeys = [v.pubkey for v in state.validators]
|
|
# Verify pubkeys exists
|
|
request_source_pubkey = consolidation_request.source_pubkey
|
|
request_target_pubkey = consolidation_request.target_pubkey
|
|
if request_source_pubkey not in validator_pubkeys:
|
|
return
|
|
if request_target_pubkey not in validator_pubkeys:
|
|
return
|
|
source_index = ValidatorIndex(validator_pubkeys.index(request_source_pubkey))
|
|
target_index = ValidatorIndex(validator_pubkeys.index(request_target_pubkey))
|
|
source_validator = state.validators[source_index]
|
|
target_validator = state.validators[target_index]
|
|
|
|
# Verify that source != target, so a consolidation cannot be used as an exit.
|
|
if source_index == target_index:
|
|
return
|
|
|
|
# Verify source withdrawal credentials
|
|
has_correct_credential = has_execution_withdrawal_credential(source_validator)
|
|
is_correct_source_address = (
|
|
source_validator.withdrawal_credentials[12:] == consolidation_request.source_address
|
|
)
|
|
if not (has_correct_credential and is_correct_source_address):
|
|
return
|
|
|
|
# Verify that target has execution withdrawal credentials
|
|
if not has_execution_withdrawal_credential(target_validator):
|
|
return
|
|
|
|
# Verify the source and the target are active
|
|
current_epoch = get_current_epoch(state)
|
|
if not is_active_validator(source_validator, current_epoch):
|
|
return
|
|
if not is_active_validator(target_validator, current_epoch):
|
|
return
|
|
# Verify exits for source and target have not been initiated
|
|
if source_validator.exit_epoch != FAR_FUTURE_EPOCH:
|
|
return
|
|
if target_validator.exit_epoch != FAR_FUTURE_EPOCH:
|
|
return
|
|
|
|
# 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=source_index,
|
|
target_index=target_index
|
|
))
|
|
```
|
|
|
|
## Testing
|
|
|
|
*Note*: The function `initialize_beacon_state_from_eth1` is modified for pure Electra testing only.
|
|
Modifications include:
|
|
1. Use `ELECTRA_FORK_VERSION` as the previous and current fork version.
|
|
2. Utilize the Electra `BeaconBlockBody` when constructing the initial `latest_block_header`.
|
|
3. *[New in Electra:EIP6110]* Add `deposit_requests_start_index` variable to the genesis state initialization.
|
|
4. *[New in Electra:EIP7251]* Initialize new fields to support increasing the maximum effective balance.
|
|
|
|
```python
|
|
def initialize_beacon_state_from_eth1(eth1_block_hash: Hash32,
|
|
eth1_timestamp: uint64,
|
|
deposits: Sequence[Deposit],
|
|
execution_payload_header: ExecutionPayloadHeader=ExecutionPayloadHeader()
|
|
) -> BeaconState:
|
|
fork = Fork(
|
|
previous_version=ELECTRA_FORK_VERSION, # [Modified in Electra:EIP6110] for testing only
|
|
current_version=ELECTRA_FORK_VERSION, # [Modified in Electra:EIP6110]
|
|
epoch=GENESIS_EPOCH,
|
|
)
|
|
state = BeaconState(
|
|
genesis_time=eth1_timestamp + GENESIS_DELAY,
|
|
fork=fork,
|
|
eth1_data=Eth1Data(block_hash=eth1_block_hash, deposit_count=uint64(len(deposits))),
|
|
latest_block_header=BeaconBlockHeader(body_root=hash_tree_root(BeaconBlockBody())),
|
|
randao_mixes=[eth1_block_hash] * EPOCHS_PER_HISTORICAL_VECTOR, # Seed RANDAO with Eth1 entropy
|
|
deposit_requests_start_index=UNSET_DEPOSIT_REQUESTS_START_INDEX, # [New in Electra:EIP6110]
|
|
)
|
|
|
|
# Process deposits
|
|
leaves = list(map(lambda deposit: deposit.data, deposits))
|
|
for index, deposit in enumerate(deposits):
|
|
deposit_data_list = List[DepositData, 2**DEPOSIT_CONTRACT_TREE_DEPTH](*leaves[:index + 1])
|
|
state.eth1_data.deposit_root = hash_tree_root(deposit_data_list)
|
|
process_deposit(state, deposit)
|
|
|
|
# Process deposit balance updates
|
|
for deposit in state.pending_balance_deposits:
|
|
increase_balance(state, deposit.index, deposit.amount)
|
|
state.pending_balance_deposits = []
|
|
|
|
# Process activations
|
|
for index, validator in enumerate(state.validators):
|
|
balance = state.balances[index]
|
|
# [Modified in Electra:EIP7251]
|
|
validator.effective_balance = min(
|
|
balance - balance % EFFECTIVE_BALANCE_INCREMENT, get_validator_max_effective_balance(validator))
|
|
if validator.effective_balance >= MIN_ACTIVATION_BALANCE:
|
|
validator.activation_eligibility_epoch = GENESIS_EPOCH
|
|
validator.activation_epoch = GENESIS_EPOCH
|
|
|
|
# Set genesis validators root for domain separation and chain versioning
|
|
state.genesis_validators_root = hash_tree_root(state.validators)
|
|
|
|
# Fill in sync committees
|
|
# Note: A duplicate committee is assigned for the current and next committee at genesis
|
|
state.current_sync_committee = get_next_sync_committee(state)
|
|
state.next_sync_committee = get_next_sync_committee(state)
|
|
|
|
# Initialize the execution payload header
|
|
state.latest_execution_payload_header = execution_payload_header
|
|
|
|
return state
|
|
```
|