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# EIP7251 - Spec
## Table of contents
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- [Introduction ](#introduction )
- [Constants ](#constants )
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- [Misc ](#misc )
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- [Withdrawal prefixes ](#withdrawal-prefixes )
- [Domains ](#domains )
- [Presets ](#presets )
- [Gwei values ](#gwei-values )
- [Rewards and penalties ](#rewards-and-penalties )
- [Max operations per block ](#max-operations-per-block )
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- [Execution ](#execution )
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- [State list lengths ](#state-list-lengths )
- [Configuration ](#configuration )
- [Validator cycle ](#validator-cycle )
- [Containers ](#containers )
- [New containers ](#new-containers )
- [New `PendingBalanceDeposit` ](#new-pendingbalancedeposit )
- [New `PartialWithdrawal` ](#new-partialwithdrawal )
- [New `ExecutionLayerWithdrawRequest` ](#new-executionlayerwithdrawrequest )
- [New `Consolidation` ](#new-consolidation )
- [New `SignedConsolidation` ](#new-signedconsolidation )
- [New `PendingConsolidation` ](#new-pendingconsolidation )
- [Extended Containers ](#extended-containers )
- [`BeaconState` ](#beaconstate )
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- [`BeaconBlockBody` ](#beaconblockbody )
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- [Helpers ](#helpers )
- [Predicates ](#predicates )
- [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 )
- [New `has_execution_withdrawal_credential` ](#new-has_execution_withdrawal_credential )
- [Updated `is_fully_withdrawable_validator` ](#updated-is_fully_withdrawable_validator )
- [Updated `is_partially_withdrawable_validator` ](#updated-is_partially_withdrawable_validator )
- [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 )
- [New `get_activation_exit_churn_limit` ](#new-get_activation_exit_churn_limit )
- [New `get_consolidation_churn_limit` ](#new-get_consolidation_churn_limit )
- [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 )
- [Updated `initiate_validator_exit` ](#updated--initiate_validator_exit )
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- [New `switch_to_compounding_validator` ](#new-switch_to_compounding_validator )
- [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 )
- [New `compute_consolidation_epoch_and_update_churn` ](#new-compute_consolidation_epoch_and_update_churn )
- [Updated `slash_validator` ](#updated-slash_validator )
- [Beacon chain state transition function ](#beacon-chain-state-transition-function )
- [Epoch processing ](#epoch-processing )
- [Updated `process_epoch` ](#updated-process_epoch )
- [Updated `process_registry_updates` ](#updated--process_registry_updates )
- [New `process_pending_balance_deposits` ](#new-process_pending_balance_deposits )
- [New `process_pending_consolidations` ](#new-process_pending_consolidations )
- [Updated `process_effective_balance_updates` ](#updated-process_effective_balance_updates )
- [Block processing ](#block-processing )
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- [Updated `get_expected_withdrawals` ](#updated-get_expected_withdrawals )
- [Updated `process_withdrawals` ](#updated-process_withdrawals )
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- [Operations ](#operations )
- [Updated `process_operations` ](#updated-process_operations )
- [Deposits ](#deposits )
- [Updated `apply_deposit` ](#updated--apply_deposit )
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- [New `is_valid_deposit_signature` ](#new-is_valid_deposit_signature )
- [Modified `add_validator_to_registry` ](#modified-add_validator_to_registry )
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- [Updated `get_validator_from_deposit` ](#updated-get_validator_from_deposit )
- [Withdrawals ](#withdrawals )
- [New `process_execution_layer_withdraw_request` ](#new-process_execution_layer_withdraw_request )
- [Consolidations ](#consolidations )
- [New `process_consolidation` ](#new-process_consolidation )
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- [Voluntary exits ](#voluntary-exits )
- [Updated `process_voluntary_exit` ](#updated-process_voluntary_exit )
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## Introduction
See [a modest proposal ](https://notes.ethereum.org/@mikeneuder/increase-maxeb ), the [diff view ](https://github.com/michaelneuder/consensus-specs/pull/3/files ) and
[security considerations ](https://notes.ethereum.org/@fradamt/meb-increase-security ).
*Note:* This specification is built upon [Deneb ](../../deneb/beacon-chain.md ).
## Constants
The following values are (non-configurable) constants used throughout the specification.
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### Misc
| Name | Value |
| - | - |
| `FULL_EXIT_REQUEST_AMOUNT` | `uint64(2**64 - 1)` |
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### Withdrawal prefixes
| Name | Value |
| - | - |
| `BLS_WITHDRAWAL_PREFIX` | `Bytes1('0x00')` |
| `ETH1_ADDRESS_WITHDRAWAL_PREFIX` | `Bytes1('0x01')` |
| `COMPOUNDING_WITHDRAWAL_PREFIX` | `Bytes1('0x02')` |
### Domains
| Name | Value |
| - | - |
| `DOMAIN_CONSOLIDATION` | `DomainType('0x0B000000')` |
## Presets
### Gwei values
| Name | Value |
| - | - |
| `MIN_ACTIVATION_BALANCE` | `Gwei(2**5 * 10**9)` (= 32,000,000,000) |
| `MAX_EFFECTIVE_BALANCE_EIP7251` | `Gwei(2**11 * 10**9)` (= 2048,000,000,000) |
### Rewards and penalties
| Name | Value |
| - | - |
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| `MIN_SLASHING_PENALTY_QUOTIENT_EIP7251` | `uint64(2**12)` (= 4,096) |
| `WHISTLEBLOWER_REWARD_QUOTIENT_EIP7251` | `uint64(2**12)` (= 4,096) |
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### Max operations per block
| Name | Value |
| - | - |
| `MAX_CONSOLIDATIONS` | `uint64(1)` |
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### Execution
| Name | Value | Description |
| - | - | - |
| `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 |
| - | - | :-: |
| `PENDING_BALANCE_DEPOSITS_LIMIT` | `uint64(2**27)` (= 134,217,728) | pending balance deposits |
| `PENDING_PARTIAL_WITHDRAWALS_LIMIT` | `uint64(2**27)` (= 134,217,728) | pending partial withdrawals |
| `PENDING_CONSOLIDATIONS_LIMIT` | `uint64(2**18)` (= 262,144) | pending consolidations |
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## Configuration
### Validator cycle
| Name | Value |
| - | - |
| `MIN_PER_EPOCH_CHURN_LIMIT_EIP7251` | `Gwei(2**7 * 10**9)` (= 128,000,000,000) | # Equivalent to 4 32 ETH validators
| `MAX_PER_EPOCH_ACTIVATION_EXIT_CHURN_LIMIT` | `Gwei(2**8 * 10**9)` (256,000,000,000) |
## Containers
### New containers
#### New `PendingBalanceDeposit`
```python
class PendingBalanceDeposit(Container):
index: ValidatorIndex
amount: Gwei
```
#### New `PartialWithdrawal`
```python
class PartialWithdrawal(Container):
index: ValidatorIndex
amount: Gwei
withdrawable_epoch: Epoch
```
#### New `ExecutionLayerWithdrawRequest`
```python
class ExecutionLayerWithdrawRequest(Container):
source_address: ExecutionAddress
validator_pubkey: BLSPubkey
amount: Gwei
```
#### New `Consolidation`
```python
class Consolidation(Container):
source_index: ValidatorIndex
target_index: ValidatorIndex
epoch: Epoch
```
#### New `SignedConsolidation`
```python
class SignedConsolidation(Container):
message: Consolidation
signature: BLSSignature
```
#### New `PendingConsolidation`
```python
class PendingConsolidation(Container):
source_index: ValidatorIndex
target_index: ValidatorIndex
```
### Extended Containers
#### `BeaconState`
```python
class BeaconState(Container):
# Versioning
genesis_time: uint64
genesis_validators_root: Root
slot: Slot
fork: Fork
# History
latest_block_header: BeaconBlockHeader
block_roots: Vector[Root, SLOTS_PER_HISTORICAL_ROOT]
state_roots: Vector[Root, SLOTS_PER_HISTORICAL_ROOT]
historical_roots: List[Root, HISTORICAL_ROOTS_LIMIT]
# Eth1
eth1_data: Eth1Data
eth1_data_votes: List[Eth1Data, EPOCHS_PER_ETH1_VOTING_PERIOD * SLOTS_PER_EPOCH]
eth1_deposit_index: uint64
# Registry
validators: List[Validator, VALIDATOR_REGISTRY_LIMIT]
balances: List[Gwei, VALIDATOR_REGISTRY_LIMIT]
# Randomness
randao_mixes: Vector[Bytes32, EPOCHS_PER_HISTORICAL_VECTOR]
# Slashings
slashings: Vector[Gwei, EPOCHS_PER_SLASHINGS_VECTOR] # Per-epoch sums of slashed effective balances
# Participation
previous_epoch_participation: List[ParticipationFlags, VALIDATOR_REGISTRY_LIMIT]
current_epoch_participation: List[ParticipationFlags, VALIDATOR_REGISTRY_LIMIT]
# Finality
justification_bits: Bitvector[JUSTIFICATION_BITS_LENGTH] # Bit set for every recent justified epoch
previous_justified_checkpoint: Checkpoint
current_justified_checkpoint: Checkpoint
finalized_checkpoint: Checkpoint
# Inactivity
inactivity_scores: List[uint64, VALIDATOR_REGISTRY_LIMIT]
# Sync
current_sync_committee: SyncCommittee
next_sync_committee: SyncCommittee
# Execution
latest_execution_payload_header: ExecutionPayloadHeader
# Withdrawals
next_withdrawal_index: WithdrawalIndex
next_withdrawal_validator_index: ValidatorIndex
# Deep history valid from Capella onwards
historical_summaries: List[HistoricalSummary, HISTORICAL_ROOTS_LIMIT]
# EIP-7251
deposit_balance_to_consume: Gwei # [New in EIP-7251]
exit_balance_to_consume: Gwei # [New in EIP-7251]
earliest_exit_epoch: Epoch # [New in EIP-7251]
consolidation_balance_to_consume: Gwei # [New in EIP-7251]
earliest_consolidation_epoch: Epoch # [New in EIP-7251]
pending_balance_deposits: List[PendingBalanceDeposit, PENDING_BALANCE_DEPOSITS_LIMIT] # [New in EIP-7251]
pending_partial_withdrawals: List[PartialWithdrawal, PENDING_PARTIAL_WITHDRAWALS_LIMIT] # [New in EIP-7251]
pending_consolidations: List[PendingConsolidation, PENDING_CONSOLIDATIONS_LIMIT] # [New in EIP-7251]
```
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#### `BeaconBlockBody`
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```python
class BeaconBlockBody(Container):
randao_reveal: BLSSignature
eth1_data: Eth1Data # Eth1 data vote
graffiti: Bytes32 # Arbitrary data
# Operations
proposer_slashings: List[ProposerSlashing, MAX_PROPOSER_SLASHINGS]
attester_slashings: List[AttesterSlashing, MAX_ATTESTER_SLASHINGS]
attestations: List[Attestation, MAX_ATTESTATIONS]
deposits: List[Deposit, MAX_DEPOSITS]
voluntary_exits: List[SignedVoluntaryExit, MAX_VOLUNTARY_EXITS]
sync_aggregate: SyncAggregate
# Execution
execution_payload: ExecutionPayload
bls_to_execution_changes: List[SignedBLSToExecutionChange, MAX_BLS_TO_EXECUTION_CHANGES]
blob_kzg_commitments: List[KZGCommitment, MAX_BLOB_COMMITMENTS_PER_BLOCK]
consolidations: List[SignedConsolidation, MAX_CONSOLIDATIONS] # [New in EIP-7251]
```
## Helpers
### Predicates
#### Updated `is_eligible_for_activation_queue`
```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 EIP7251]
)
```
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#### New `is_compounding_withdrawal_credential`
```python
def is_compounding_withdrawal_credential(withdrawal_credentials: Bytes32) -> bool:
return withdrawal_credentials[:1] == COMPOUNDING_WITHDRAWAL_PREFIX
```
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#### New `has_compounding_withdrawal_credential`
```python
def has_compounding_withdrawal_credential(validator: Validator) -> bool:
"""
Check if ``validator`` has an 0x02 prefixed "compounding" withdrawal credential.
"""
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return is_compounding_withdrawal_credential(validator.withdrawal_credentials)
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```
#### 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)
```
#### Updated `is_fully_withdrawable_validator`
```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 EIP7251]
and validator.withdrawable_epoch < = epoch
and balance > 0
)
```
#### Updated `is_partially_withdrawable_validator`
```python
def is_partially_withdrawable_validator(validator: Validator, balance: Gwei) -> bool:
"""
Check if ``validator`` is partially withdrawable.
"""
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max_effective_balance = get_validator_max_effective_balance(validator)
has_max_effective_balance = validator.effective_balance == max_effective_balance # [Modified in EIP7251]
has_excess_balance = balance > max_effective_balance # [Modified in EIP7251]
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return (
has_execution_withdrawal_credential(validator) # [Modified in EIP7251]
and has_max_effective_balance
and has_excess_balance
)
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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):
return MAX_EFFECTIVE_BALANCE_EIP7251
else:
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return MIN_ACTIVATION_BALANCE
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```
#### New `get_churn_limit`
```python
def get_churn_limit(state: BeaconState) -> Gwei:
"""
Return the churn limit for the current epoch.
"""
churn = max(
MIN_PER_EPOCH_CHURN_LIMIT_EIP7251,
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_churn_limit(state))
```
#### New `get_consolidation_churn_limit`
```python
def get_consolidation_churn_limit(state: BeaconState) -> Gwei:
return get_churn_limit(state) - get_activation_exit_churn_limit(state)
```
#### New `get_active_balance`
```python
def get_active_balance(state: BeaconState, validator_index: ValidatorIndex) -> Gwei:
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active_balance_ceil = (
MIN_ACTIVATION_BALANCE
if has_eth1_withdrawal_credential(state.validators[validator_index])
else MAX_EFFECTIVE_BALANCE_EIP7251
)
return min(state.balances[validator_index], active_balance_ceil)
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```
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#### 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)
```
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### Beacon state mutators
#### Updated `initiate_validator_exit`
```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 EIP 7251]
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)
```
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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 > MAX_EFFECTIVE_BALANCE:
excess_balance = balance - MAX_EFFECTIVE_BALANCE
state.balances[index] = balance - excess_balance
state.pending_balance_deposits.append(
PendingBalanceDeposit(index=index, amount=excess_balance)
)
```
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#### 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)
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# Apply proposer and whistleblower rewards
proposer_index = get_beacon_proposer_index(state)
if whistleblower_index is None:
whistleblower_index = proposer_index
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whistleblower_reward = Gwei(
validator.effective_balance // WHISTLEBLOWER_REWARD_QUOTIENT_EIP7251) # [Modified in EIP7251]
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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))
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```
## 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)
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process_registry_updates(state) # [Modified in EIP7251]
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process_slashings(state)
process_eth1_data_reset(state)
process_pending_balance_deposits(state) # New in EIP7251
process_pending_consolidations(state) # New in EIP7251
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process_effective_balance_updates(state) # [Modified in EIP7251]
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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:
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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:
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break
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increase_balance(state, deposit.index, deposit.amount)
processed_amount += deposit.amount
next_deposit_index += 1
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state.pending_balance_deposits = state.pending_balance_deposits[next_deposit_index:]
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if len(state.pending_balance_deposits) == 0:
state.deposit_balance_to_consume = 0
else:
state.deposit_balance_to_consume = available_for_processing - processed_amount
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```
#### 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
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# Churn any target excess active balance of target and raise its max
switch_to_compounding_validator(state, pending_consolidation.target_index)
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# Move active balance to target. Excess balance is withdrawable.
active_balance = get_active_balance(state, pending_consolidation.source_index)
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decrease_balance(state, pending_consolidation.source_index, active_balance)
increase_balance(state, pending_consolidation.target_index, active_balance)
next_pending_consolidation += 1
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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
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EFFECTIVE_BALANCE_LIMIT = (
MAX_EFFECTIVE_BALANCE_EIP7251 if has_compounding_withdrawal_credential(validator)
else MIN_ACTIVATION_BALANCE
)
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if (
balance + DOWNWARD_THRESHOLD < validator.effective_balance
or validator.effective_balance + UPWARD_THRESHOLD < balance
):
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validator.effective_balance = min(balance - balance % EFFECTIVE_BALANCE_INCREMENT, EFFECTIVE_BALANCE_LIMIT)
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```
### Block processing
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```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:
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if withdrawal.withdrawable_epoch > epoch or len(withdrawals) == MAX_PARTIAL_WITHDRAWALS_PER_PAYLOAD:
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break
validator = state.validators[withdrawal.index]
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has_sufficient_effective_balance = validator.effective_balance == MIN_ACTIVATION_BALANCE
has_excess_balance = state.balances[withdrawal.index] > MIN_ACTIVATION_BALANCE
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if validator.exit_epoch == FAR_FUTURE_EPOCH and has_sufficient_effective_balance and has_excess_balance:
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withdrawable_balance = min(state.balances[withdrawal.index] - MIN_ACTIVATION_BALANCE, withdrawal.amount)
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withdrawals.append(Withdrawal(
index=withdrawal_index,
validator_index=withdrawal.index,
address=ExecutionAddress(validator.withdrawal_credentials[12:]),
amount=withdrawable_balance,
))
withdrawal_index += WithdrawalIndex(1)
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partial_withdrawals_count = len(withdrawals)
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# 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:]),
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amount=balance - get_validator_max_effective_balance(validator), # [Modified in EIP7251]
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))
withdrawal_index += WithdrawalIndex(1)
if len(withdrawals) == MAX_WITHDRAWALS_PER_PAYLOAD:
break
validator_index = ValidatorIndex((validator_index + 1) % len(state.validators))
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return withdrawals, partial_withdrawals_count
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```
##### Updated `process_withdrawals`
```python
def process_withdrawals(state: BeaconState, payload: ExecutionPayload) -> None:
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expected_withdrawals, partial_withdrawals_count = get_expected_withdrawals(state) # [Modified in EIP7251]
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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
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state.pending_partial_withdrawals = state.pending_partial_withdrawals[partial_withdrawals_count:]
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# 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
```
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#### 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)
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for_ops(body.deposits, process_deposit) # [Modified in EIP7251]
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for_ops(body.voluntary_exits, process_voluntary_exit) # [Modified in EIP7251]
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for_ops(body.bls_to_execution_changes, process_bls_to_execution_change)
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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:
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validator_pubkeys = [v.pubkey for v in state.validators]
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if pubkey not in validator_pubkeys:
# Verify the deposit signature (proof of possession) which is not checked by the deposit contract
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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))
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state.pending_balance_deposits.append(
PendingBalanceDeposit(index=index, amount=amount)) # [Modified in EIP-7251]
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# 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:
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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)
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```
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###### Modified `add_validator_to_registry`
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```python
def add_validator_to_registry(state: BeaconState,
pubkey: BLSPubkey,
withdrawal_credentials: Bytes32,
amount: uint64) -> None:
index = get_index_for_new_validator(state)
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validator = get_validator_from_deposit(pubkey, withdrawal_credentials)
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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))
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state.pending_balance_deposits.append(PendingBalanceDeposit(index=index, amount=amount)) # [New in EIP7251]
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```
###### 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
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is_full_exit_request = amount == FULL_EXIT_REQUEST_AMOUNT
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# If partial withdrawal queue is full, only full exits are processed
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if len(state.pending_partial_withdrawals) >= PENDING_PARTIAL_WITHDRAWALS_LIMIT and not is_full_exit_request:
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return
validator_pubkeys = [v.pubkey for v in state.validators]
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index = ValidatorIndex(validator_pubkeys.index(execution_layer_withdraw_request.validator_pubkey))
validator = state.validators[index]
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# Same conditions as in EIP-7002
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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
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and validator.exit_epoch == FAR_FUTURE_EPOCH
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# Verify the validator has been active long enough
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and get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
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):
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return
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pending_balance_to_withdraw = get_pending_balance_to_withdraw(state, index)
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if is_full_exit_request:
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# Only exit validator if it has no pending withdrawals in the queue
if pending_balance_to_withdraw == 0:
initiate_validator_exit(state, index)
return
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has_sufficient_effective_balance = validator.effective_balance >= MIN_ACTIVATION_BALANCE
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has_excess_balance = state.balances[index] > MIN_ACTIVATION_BALANCE + pending_balance_to_withdraw
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# Only allow partial withdrawals with compounding withdrawal credentials
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if has_compounding_withdrawal_credential(validator) and has_sufficient_effective_balance and has_excess_balance:
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to_withdraw = min(
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state.balances[index] - MIN_ACTIVATION_BALANCE - pending_balance_to_withdraw,
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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(PartialWithdrawal(
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index=index,
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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
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assert get_consolidation_churn_limit(state) > MIN_ACTIVATION_BALANCE
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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
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assert source_validator.withdrawal_credentials[12:] == target_validator.withdrawal_credentials[12:]
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# 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
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source_validator.exit_epoch = compute_consolidation_epoch_and_update_churn(
state, source_validator.effective_balance)
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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
))
```
2024-03-27 11:57:54 +00:00
##### 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)
```