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nimbus-eth2/beacon_chain/spec/beaconstate.nim

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# beacon_chain
# Copyright (c) 2018-2024 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [].}
import
stew/assign2,
json_serialization/std/sets,
chronicles,
./datatypes/[phase0, altair, bellatrix],
"."/[eth2_merkleization, forks, signatures, validator]
from std/algorithm import fill, sort
from std/sequtils import anyIt, mapIt, toSeq
from ./datatypes/capella import BeaconState, ExecutionPayloadHeader, Withdrawal
export extras, forks, validator, chronicles
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#increase_balance
func increase_balance*(balance: var Gwei, delta: Gwei) =
balance += delta
func increase_balance*(
state: var ForkyBeaconState, index: ValidatorIndex, delta: Gwei) =
## Increase the validator balance at index ``index`` by ``delta``.
if delta != 0.Gwei: # avoid dirtying the balance cache if not needed
increase_balance(state.balances.mitem(index), delta)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#decrease_balance
func decrease_balance*(balance: var Gwei, delta: Gwei) =
balance =
if delta > balance:
0.Gwei
else:
balance - delta
func decrease_balance*(
state: var ForkyBeaconState, index: ValidatorIndex, delta: Gwei) =
## Decrease the validator balance at index ``index`` by ``delta``, with
## underflow protection.
if delta != 0.Gwei: # avoid dirtying the balance cache if not needed
decrease_balance(state.balances.mitem(index), delta)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#deposits
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#modified-apply_deposit
func get_validator_from_deposit*(
state: phase0.BeaconState | altair.BeaconState | bellatrix.BeaconState |
capella.BeaconState | deneb.BeaconState,
deposit: DepositData): Validator =
let
amount = deposit.amount
effective_balance = min(
amount - amount mod EFFECTIVE_BALANCE_INCREMENT.Gwei,
MAX_EFFECTIVE_BALANCE.Gwei)
Validator(
pubkeyData: HashedValidatorPubKey.init(deposit.pubkey),
withdrawal_credentials: deposit.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: effective_balance
)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#updated-get_validator_from_deposit
func get_validator_from_deposit*(
state: electra.BeaconState, deposit: DepositData): Validator =
Validator(
pubkeyData: HashedValidatorPubKey.init(deposit.pubkey),
withdrawal_credentials: deposit.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.Gwei # [Modified in Electra:EIP7251]
)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.7/specs/phase0/beacon-chain.md#compute_activation_exit_epoch
func compute_activation_exit_epoch*(epoch: Epoch): Epoch =
## Return the epoch during which validator activations and exits initiated in
## ``epoch`` take effect.
epoch + 1 + MAX_SEED_LOOKAHEAD
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#get_validator_churn_limit
func get_validator_churn_limit*(
cfg: RuntimeConfig, state: ForkyBeaconState, cache: var StateCache):
uint64 =
## Return the validator churn limit for the current epoch.
max(
cfg.MIN_PER_EPOCH_CHURN_LIMIT,
count_active_validators(
state, state.get_current_epoch(), cache) div cfg.CHURN_LIMIT_QUOTIENT)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/deneb/beacon-chain.md#new-get_validator_activation_churn_limit
func get_validator_activation_churn_limit*(
cfg: RuntimeConfig, state: deneb.BeaconState | electra.BeaconState,
cache: var StateCache): uint64 =
## Return the validator activation churn limit for the current epoch.
min(
cfg.MAX_PER_EPOCH_ACTIVATION_CHURN_LIMIT,
get_validator_churn_limit(cfg, state, cache))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#initiate_validator_exit
func get_state_exit_queue_info*(
state: phase0.BeaconState | altair.BeaconState | bellatrix.BeaconState |
capella.BeaconState | deneb.BeaconState): ExitQueueInfo =
var
exit_queue_epoch = compute_activation_exit_epoch(get_current_epoch(state))
exit_queue_churn: uint64
# Compute max exit epoch
for idx in 0..<state.validators.len:
let exit_epoch = state.validators.item(idx).exit_epoch
if exit_epoch != FAR_FUTURE_EPOCH and exit_epoch > exit_queue_epoch:
exit_queue_epoch = exit_epoch
# Reset exit queue churn counter as the expected exit_queue_epoch updates
# via this essentially max()-but-not-FAR_FUTURE_EPOCH loop to restart the
# counting the second for loop in spec version does. Only the last count,
# the one corresponding to the ultimately correct exit_queue_epoch, won't
# be reset.
exit_queue_churn = 0
# Second spec loop body, which there is responsible for taking the already
# known exit_queue_epoch, scanning for all validators with that exit epoch
# and checking if they'll reach validator_churn_limit(state). Do that here
# incrementally to fuse the two loops and save an all-validator iteration.
if exit_epoch == exit_queue_epoch:
inc exit_queue_churn
ExitQueueInfo(
exit_queue_epoch: exit_queue_epoch, exit_queue_churn: exit_queue_churn)
func get_state_exit_queue_info*(state: electra.BeaconState): ExitQueueInfo =
# Electra initiate_validator_exit doesn't have same quadratic aspect given
# StateCache balance caching
default(ExitQueueInfo)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#initiate_validator_exit
func initiate_validator_exit*(
cfg: RuntimeConfig,
state: var (phase0.BeaconState | altair.BeaconState |
bellatrix.BeaconState | capella.BeaconState |
deneb.BeaconState),
index: ValidatorIndex, exit_queue_info: ExitQueueInfo,
cache: var StateCache): Result[ExitQueueInfo, cstring] =
## Initiate the exit of the validator with index ``index``.
if state.validators.item(index).exit_epoch != FAR_FUTURE_EPOCH:
return ok(exit_queue_info) # Before touching cache
# Return if validator already initiated exit
let validator = addr state.validators.mitem(index)
var
exit_queue_epoch = exit_queue_info.exit_queue_epoch
exit_queue_churn = exit_queue_info.exit_queue_churn
if exit_queue_churn >= get_validator_churn_limit(cfg, state, cache):
inc exit_queue_epoch
# Bookkeeping for inter-operation caching; include this exit for next time
exit_queue_churn = 1
else:
inc exit_queue_churn
# Set validator exit epoch and withdrawable epoch
validator.exit_epoch = exit_queue_epoch
if validator.exit_epoch + cfg.MIN_VALIDATOR_WITHDRAWABILITY_DELAY <
validator.exit_epoch:
return err("initiate_validator_exit: exit_epoch overflowed")
validator.withdrawable_epoch =
validator.exit_epoch + cfg.MIN_VALIDATOR_WITHDRAWABILITY_DELAY
ok(ExitQueueInfo(
exit_queue_epoch: exit_queue_epoch, exit_queue_churn: exit_queue_churn))
func get_total_active_balance*(state: ForkyBeaconState, cache: var StateCache): Gwei
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-get_balance_churn_limit
func get_balance_churn_limit(
cfg: RuntimeConfig, state: electra.BeaconState,
cache: var StateCache): Gwei =
## Return the churn limit for the current epoch.
let churn = max(
cfg.MIN_PER_EPOCH_CHURN_LIMIT_ELECTRA.Gwei,
get_total_active_balance(state, cache) div cfg.CHURN_LIMIT_QUOTIENT
)
churn - churn mod EFFECTIVE_BALANCE_INCREMENT.Gwei
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-get_activation_exit_churn_limit
func get_activation_exit_churn_limit*(
cfg: RuntimeConfig, state: electra.BeaconState, cache: var StateCache):
Gwei =
## Return the churn limit for the current epoch dedicated to activations and
## exits.
min(
cfg.MAX_PER_EPOCH_ACTIVATION_EXIT_CHURN_LIMIT.Gwei,
get_balance_churn_limit(cfg, state, cache))
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-get_consolidation_churn_limit
func get_consolidation_churn_limit*(
cfg: RuntimeConfig, state: electra.BeaconState, cache: var StateCache):
Gwei =
get_balance_churn_limit(cfg, state, cache) -
get_activation_exit_churn_limit(cfg, state, cache)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-compute_exit_epoch_and_update_churn
func compute_exit_epoch_and_update_churn*(
cfg: RuntimeConfig, state: var electra.BeaconState, exit_balance: Gwei,
cache: var StateCache): Epoch =
var earliest_exit_epoch = max(state.earliest_exit_epoch,
compute_activation_exit_epoch(get_current_epoch(state)))
let per_epoch_churn = get_activation_exit_churn_limit(cfg, state, cache)
# New epoch for exits.
var exit_balance_to_consume =
if state.earliest_exit_epoch < earliest_exit_epoch:
per_epoch_churn
else:
state.exit_balance_to_consume
# Exit doesn't fit in the current earliest epoch.
if exit_balance > exit_balance_to_consume:
let
balance_to_process = exit_balance - exit_balance_to_consume
additional_epochs = (balance_to_process - 1.Gwei) div 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
state.earliest_exit_epoch
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-compute_consolidation_epoch_and_update_churn
func compute_consolidation_epoch_and_update_churn*(
cfg: RuntimeConfig, state: var electra.BeaconState,
consolidation_balance: Gwei, cache: var StateCache): Epoch =
var earliest_consolidation_epoch = max(state.earliest_consolidation_epoch,
compute_activation_exit_epoch(get_current_epoch(state)))
let per_epoch_consolidation_churn =
get_consolidation_churn_limit(cfg, state, cache)
# New epoch for consolidations.
var consolidation_balance_to_consume =
if state.earliest_consolidation_epoch < earliest_consolidation_epoch:
per_epoch_consolidation_churn
else:
state.consolidation_balance_to_consume
# Consolidation doesn't fit in the current earliest epoch.
if consolidation_balance > consolidation_balance_to_consume:
let
balance_to_process = consolidation_balance - consolidation_balance_to_consume
additional_epochs = (balance_to_process - 1.Gwei) div 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
state.earliest_consolidation_epoch
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#updated--initiate_validator_exit
func initiate_validator_exit*(
cfg: RuntimeConfig, state: var electra.BeaconState,
index: ValidatorIndex, exit_queue_info: ExitQueueInfo,
cache: var StateCache): Result[ExitQueueInfo, cstring] =
## Initiate the exit of the validator with index ``index``.
# Return if validator already initiated exit
var validator = state.validators.item(index)
if validator.exit_epoch != FAR_FUTURE_EPOCH:
return ok(static(default(ExitQueueInfo)))
# Compute exit queue epoch [Modified in Electra:EIP7251]
let exit_queue_epoch = compute_exit_epoch_and_update_churn(
cfg, state, validator.effective_balance, cache)
# Set validator exit epoch and withdrawable epoch
validator.exit_epoch = exit_queue_epoch
validator.withdrawable_epoch =
Epoch(validator.exit_epoch + cfg.MIN_VALIDATOR_WITHDRAWABILITY_DELAY)
if validator.withdrawable_epoch < validator.exit_epoch:
return err("Invalid large withdrawable epoch")
state.validators.mitem(index) = validator
# The Electra initiate_validator_exit() isn't accidentally quadratic; ignore
ok(static(default(ExitQueueInfo)))
from ./datatypes/deneb import BeaconState
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#modified-slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/bellatrix/beacon-chain.md#modified-slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#updated-slash_validator
func get_slashing_penalty*(
state: ForkyBeaconState, validator_effective_balance: Gwei): Gwei =
when state is phase0.BeaconState:
validator_effective_balance div MIN_SLASHING_PENALTY_QUOTIENT
elif state is altair.BeaconState:
validator_effective_balance div MIN_SLASHING_PENALTY_QUOTIENT_ALTAIR
elif state is bellatrix.BeaconState or state is capella.BeaconState or
state is deneb.BeaconState:
validator_effective_balance div MIN_SLASHING_PENALTY_QUOTIENT_BELLATRIX
elif state is electra.BeaconState:
validator_effective_balance div MIN_SLASHING_PENALTY_QUOTIENT_ELECTRA
else:
{.fatal: "invalid BeaconState type".}
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.7/specs/phase0/beacon-chain.md#slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#modified-slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/bellatrix/beacon-chain.md#modified-slash_validator
func get_whistleblower_reward*(
state: phase0.BeaconState | altair.BeaconState | bellatrix.BeaconState |
capella.BeaconState | deneb.BeaconState,
validator_effective_balance: Gwei): Gwei =
validator_effective_balance div WHISTLEBLOWER_REWARD_QUOTIENT
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#updated-slash_validator
func get_whistleblower_reward*(
state: electra.BeaconState, validator_effective_balance: Gwei): Gwei =
validator_effective_balance div WHISTLEBLOWER_REWARD_QUOTIENT_ELECTRA
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#modified-slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/bellatrix/beacon-chain.md#modified-slash_validator
func get_proposer_reward(state: ForkyBeaconState, whistleblower_reward: Gwei): Gwei =
when state is phase0.BeaconState:
whistleblower_reward div PROPOSER_REWARD_QUOTIENT
elif state is altair.BeaconState or state is bellatrix.BeaconState or
state is capella.BeaconState or state is deneb.BeaconState or
state is electra.BeaconState:
whistleblower_reward * PROPOSER_WEIGHT div WEIGHT_DENOMINATOR
else:
{.fatal: "invalid BeaconState type".}
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.7/specs/phase0/beacon-chain.md#slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#modified-slash_validator
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/bellatrix/beacon-chain.md#modified-slash_validator
proc slash_validator*(
cfg: RuntimeConfig, state: var ForkyBeaconState,
slashed_index: ValidatorIndex, pre_exit_queue_info: ExitQueueInfo,
cache: var StateCache): Result[(Gwei, ExitQueueInfo), cstring] =
## Slash the validator with index ``index``.
let
epoch = get_current_epoch(state)
post_exit_queue_info = ? initiate_validator_exit(
cfg, state, slashed_index, pre_exit_queue_info, cache)
let validator = addr state.validators.mitem(slashed_index)
validator.slashed = true
validator.withdrawable_epoch =
max(validator.withdrawable_epoch, epoch + EPOCHS_PER_SLASHINGS_VECTOR)
state.slashings.mitem(int(epoch mod EPOCHS_PER_SLASHINGS_VECTOR)) +=
validator.effective_balance
decrease_balance(state, slashed_index,
get_slashing_penalty(state, validator.effective_balance))
# The rest doesn't make sense without there being any proposer index, so skip
let proposer_index = get_beacon_proposer_index(state, cache).valueOr:
debug "No beacon proposer index and probably no active validators"
return ok((0.Gwei, post_exit_queue_info))
# Apply proposer and whistleblower rewards
let
# Spec has whistleblower_index as optional param, but it's never used.
whistleblower_index = proposer_index
whistleblower_reward =
get_whistleblower_reward(state, validator.effective_balance)
proposer_reward = get_proposer_reward(state, whistleblower_reward)
increase_balance(state, proposer_index, proposer_reward)
# TODO: evaluate if spec bug / underflow can be triggered
doAssert(
whistleblower_reward >= proposer_reward,
"Spec bug: underflow in slash_validator")
increase_balance(
state, whistleblower_index, whistleblower_reward - proposer_reward)
ok((proposer_reward, post_exit_queue_info))
func genesis_time_from_eth1_timestamp(
cfg: RuntimeConfig, eth1_timestamp: uint64): uint64 =
eth1_timestamp + cfg.GENESIS_DELAY
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#genesis-block
func get_initial_beacon_block*(state: phase0.HashedBeaconState):
phase0.TrustedSignedBeaconBlock =
# The genesis block is implicitly trusted
let message = phase0.TrustedBeaconBlock(
slot: state.data.slot,
state_root: state.root)
# parent_root, randao_reveal, eth1_data, signature, and body automatically
# initialized to default values.
phase0.TrustedSignedBeaconBlock(
message: message, root: hash_tree_root(message))
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/altair/beacon-chain.md#initialize-state-for-pure-altair-testnets-and-test-vectors
func get_initial_beacon_block*(state: altair.HashedBeaconState):
altair.TrustedSignedBeaconBlock =
# The genesis block is implicitly trusted
let message = altair.TrustedBeaconBlock(
slot: state.data.slot,
state_root: state.root)
# parent_root, randao_reveal, eth1_data, signature, and body automatically
# initialized to default values.
altair.TrustedSignedBeaconBlock(
message: message, root: hash_tree_root(message))
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/bellatrix/beacon-chain.md#testing
func get_initial_beacon_block*(state: bellatrix.HashedBeaconState):
bellatrix.TrustedSignedBeaconBlock =
# The genesis block is implicitly trusted
let message = bellatrix.TrustedBeaconBlock(
slot: state.data.slot,
state_root: state.root)
# parent_root, randao_reveal, eth1_data, signature, and body automatically
# initialized to default values.
bellatrix.TrustedSignedBeaconBlock(
message: message, root: hash_tree_root(message))
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/capella/beacon-chain.md#testing
func get_initial_beacon_block*(state: capella.HashedBeaconState):
capella.TrustedSignedBeaconBlock =
# The genesis block is implicitly trusted
let message = capella.TrustedBeaconBlock(
slot: state.data.slot,
state_root: state.root)
# parent_root, randao_reveal, eth1_data, signature, and body automatically
# initialized to default values.
capella.TrustedSignedBeaconBlock(
message: message, root: hash_tree_root(message))
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#testing
func get_initial_beacon_block*(state: deneb.HashedBeaconState):
deneb.TrustedSignedBeaconBlock =
# The genesis block is implicitly trusted
let message = deneb.TrustedBeaconBlock(
slot: state.data.slot,
state_root: state.root)
# parent_root, randao_reveal, eth1_data, signature, and body automatically
# initialized to default values.
deneb.TrustedSignedBeaconBlock(
message: message, root: hash_tree_root(message))
from ./datatypes/electra import
HashedBeaconState, PendingBalanceDeposit, TrustedSignedBeaconBlock
# TODO spec link here when it exists
func get_initial_beacon_block*(state: electra.HashedBeaconState):
electra.TrustedSignedBeaconBlock =
# The genesis block is implicitly trusted
let message = electra.TrustedBeaconBlock(
slot: state.data.slot,
state_root: state.root)
# parent_root, randao_reveal, eth1_data, signature, and body automatically
# initialized to default values.
electra.TrustedSignedBeaconBlock(
message: message, root: hash_tree_root(message))
func get_initial_beacon_block*(state: ForkedHashedBeaconState):
ForkedTrustedSignedBeaconBlock =
withState(state):
ForkedTrustedSignedBeaconBlock.init(get_initial_beacon_block(forkyState))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#get_block_root_at_slot
func get_block_root_at_slot*(state: ForkyBeaconState, slot: Slot): Eth2Digest =
## Return the block root at a recent ``slot``.
# Potential overflow/wrap shouldn't occur, as get_block_root_at_slot() called
# from internally controlled sources, but flag this explicitly, in case.
doAssert slot + SLOTS_PER_HISTORICAL_ROOT > slot
doAssert state.slot <= slot + SLOTS_PER_HISTORICAL_ROOT
doAssert slot < state.slot
state.block_roots[slot mod SLOTS_PER_HISTORICAL_ROOT]
func get_block_root_at_slot*(
state: ForkedHashedBeaconState, slot: Slot): Eth2Digest =
## Return the block root at a recent ``slot``.
withState(state):
get_block_root_at_slot(forkyState.data, slot)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#get_block_root
func get_block_root*(state: ForkyBeaconState, epoch: Epoch): Eth2Digest =
## Return the block root at the start of a recent ``epoch``.
get_block_root_at_slot(state, epoch.start_slot())
func get_block_root(state: ForkedHashedBeaconState, epoch: Epoch): Eth2Digest =
## Return the block root at the start of a recent ``epoch``.
withState(state):
get_block_root(forkyState.data, epoch)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#get_total_balance
template get_total_balance(
state: ForkyBeaconState, validator_indices: untyped): Gwei =
## Return the combined effective balance of the ``indices``.
## ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
## Math safe up to ~10B ETH, after which this overflows uint64.
var res = 0.Gwei
for validator_index in validator_indices:
res += state.validators[validator_index].effective_balance
max(EFFECTIVE_BALANCE_INCREMENT.Gwei, res)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#is_eligible_for_activation_queue
func is_eligible_for_activation_queue*(validator: Validator): bool =
## Check if ``validator`` is eligible to be placed into the activation queue.
validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH and
validator.effective_balance == MAX_EFFECTIVE_BALANCE.Gwei
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#is_eligible_for_activation
func is_eligible_for_activation*(
state: ForkyBeaconState, validator: Validator): bool =
## Check if ``validator`` is eligible for activation.
# Placement in queue is finalized
validator.activation_eligibility_epoch <= state.finalized_checkpoint.epoch and
# Has not yet been activated
validator.activation_epoch == FAR_FUTURE_EPOCH
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#is_valid_indexed_attestation
proc is_valid_indexed_attestation*(
state: ForkyBeaconState,
indexed_attestation: SomeIndexedAttestation | electra.IndexedAttestation |
electra.TrustedIndexedAttestation,
flags: UpdateFlags): Result[void, cstring] =
## Check if ``indexed_attestation`` is not empty, has sorted and unique
## indices and has a valid aggregate signature.
template is_sorted_and_unique(s: untyped): bool =
var res = true
for i in 1 ..< s.len:
if s[i - 1].uint64 >= s[i].uint64:
res = false
break
res
if len(indexed_attestation.attesting_indices) == 0:
return err("indexed_attestation: no attesting indices")
# Not from spec, but this function gets used in front-line roles, not just
# behind firewall.
let num_validators = state.validators.lenu64
if anyIt(indexed_attestation.attesting_indices, it >= num_validators):
return err("indexed attestation: not all indices valid validators")
if not is_sorted_and_unique(indexed_attestation.attesting_indices):
return err("indexed attestation: indices not sorted and unique")
# Verify aggregate signature
if not (skipBlsValidation in flags or indexed_attestation.signature is TrustedSig):
let pubkeys = mapIt(
indexed_attestation.attesting_indices, state.validators[it].pubkey)
if not verify_attestation_signature(
state.fork, state.genesis_validators_root, indexed_attestation.data,
pubkeys, indexed_attestation.signature):
return err("indexed attestation: signature verification failure")
ok()
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#get_attesting_indices
iterator get_attesting_indices_iter*(state: ForkyBeaconState,
data: AttestationData,
bits: CommitteeValidatorsBits,
cache: var StateCache): ValidatorIndex =
## Return the set of attesting indices corresponding to ``data`` and ``bits``
## or nothing if `data` is invalid
## This iterator must not be called in functions using a
## ForkedHashedBeaconState due to https://github.com/nim-lang/Nim/issues/18188
let committee_index = CommitteeIndex.init(data.index)
if committee_index.isErr() or bits.lenu64 != get_beacon_committee_len(
state, data.slot, committee_index.get(), cache):
trace "get_attesting_indices: invalid attestation data"
else:
for index_in_committee, validator_index in get_beacon_committee(
state, data.slot, committee_index.get(), cache):
if bits[index_in_committee]:
yield validator_index
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#modified-get_attesting_indices
iterator get_attesting_indices_iter*(
state: electra.BeaconState,
data: AttestationData,
aggregation_bits: ElectraCommitteeValidatorsBits,
committee_bits: auto,
cache: var StateCache): ValidatorIndex =
## Return the set of attesting indices corresponding to ``aggregation_bits``
## and ``committee_bits``.
var pos = 0
for committee_index in get_committee_indices(committee_bits):
for _, validator_index in get_beacon_committee(
state, data.slot, committee_index, cache):
if aggregation_bits[pos]:
yield validator_index
pos += 1
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#get_attesting_indices
func get_attesting_indices*(
state: ForkyBeaconState, data: AttestationData,
aggregation_bits: CommitteeValidatorsBits, cache: var StateCache):
seq[ValidatorIndex] =
## Return the set of attesting indices corresponding to ``data`` and ``bits``
## or nothing if `data` is invalid
toSeq(get_attesting_indices_iter(state, data, aggregation_bits, cache))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#get_attesting_indices
func get_attesting_indices*(
state: ForkyBeaconState, data: AttestationData,
aggregation_bits: ElectraCommitteeValidatorsBits, committee_bits: auto,
cache: var StateCache): seq[ValidatorIndex] =
## Return the set of attesting indices corresponding to ``data`` and ``bits``
## or nothing if `data` is invalid
toSeq(get_attesting_indices_iter(state, data, aggregation_bits, committee_bits, cache))
func get_attesting_indices*(state: ForkedHashedBeaconState;
data: AttestationData;
bits: CommitteeValidatorsBits;
cache: var StateCache): seq[ValidatorIndex] =
# TODO when https://github.com/nim-lang/Nim/issues/18188 fixed, use an
# iterator
var idxBuf: seq[ValidatorIndex]
withState(state):
for vidx in forkyState.data.get_attesting_indices(data, bits, cache):
idxBuf.add vidx
idxBuf
func get_attesting_indices*(state: ForkedHashedBeaconState;
data: AttestationData;
aggregation_bits: ElectraCommitteeValidatorsBits;
committee_bits: auto,
cache: var StateCache): seq[ValidatorIndex] =
# TODO when https://github.com/nim-lang/Nim/issues/18188 fixed, use an
# iterator
var idxBuf: seq[ValidatorIndex]
withState(state):
when consensusFork >= ConsensusFork.Electra:
for vidx in forkyState.data.get_attesting_indices(data, aggregation_bits, committee_bits, cache):
idxBuf.add vidx
idxBuf
proc is_valid_indexed_attestation(
state: ForkyBeaconState,
attestation: SomeAttestation,
flags: UpdateFlags, cache: var StateCache): Result[void, cstring] =
# This is a variation on `is_valid_indexed_attestation` that works directly
# with an attestation instead of first constructing an `IndexedAttestation`
# and then validating it - for the purpose of validating the signature, the
# order doesn't matter and we can proceed straight to validating the
# signature instead
let sigs = attestation.aggregation_bits.countOnes()
if sigs == 0:
return err("is_valid_indexed_attestation: no attesting indices")
# Verify aggregate signature
if not (skipBlsValidation in flags or attestation.signature is TrustedSig):
var
pubkeys = newSeqOfCap[ValidatorPubKey](sigs)
for index in get_attesting_indices_iter(
state, attestation.data, attestation.aggregation_bits, cache):
pubkeys.add(state.validators[index].pubkey)
if not verify_attestation_signature(
state.fork, state.genesis_validators_root, attestation.data,
pubkeys, attestation.signature):
return err("indexed attestation: signature verification failure")
ok()
proc is_valid_indexed_attestation(
state: ForkyBeaconState,
attestation: electra.Attestation | electra.TrustedAttestation,
flags: UpdateFlags, cache: var StateCache): Result[void, cstring] =
# This is a variation on `is_valid_indexed_attestation` that works directly
# with an attestation instead of first constructing an `IndexedAttestation`
# and then validating it - for the purpose of validating the signature, the
# order doesn't matter and we can proceed straight to validating the
# signature instead
let sigs = attestation.aggregation_bits.countOnes()
if sigs == 0:
return err("is_valid_indexed_attestation: no attesting indices")
# Verify aggregate signature
if not (skipBlsValidation in flags or attestation.signature is TrustedSig):
var
pubkeys = newSeqOfCap[ValidatorPubKey](sigs)
for index in get_attesting_indices_iter(
state, attestation.data, attestation.aggregation_bits, attestation.committee_bits, cache):
pubkeys.add(state.validators[index].pubkey)
if not verify_attestation_signature(
state.fork, state.genesis_validators_root, attestation.data,
pubkeys, attestation.signature):
return err("indexed attestation: signature verification failure")
ok()
# Attestation validation
# ------------------------------------------------------------------------------------------
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#attestations
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
func check_attestation_slot_target*(data: AttestationData): Result[Slot, cstring] =
if not (data.target.epoch == epoch(data.slot)):
return err("Target epoch doesn't match attestation slot")
ok(data.slot)
func check_attestation_target_epoch(
data: AttestationData, current_epoch: Epoch): Result[Epoch, cstring] =
if not (data.target.epoch == get_previous_epoch(current_epoch) or
data.target.epoch == current_epoch):
return err("Target epoch not current or previous epoch")
ok(data.target.epoch)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#attestations
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#modified-process_attestation
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/deneb/beacon-chain.md#modified-process_attestation
func check_attestation_inclusion(
consensusFork: static ConsensusFork, attestation_slot: Slot,
current_slot: Slot): Result[void, cstring] =
# Check for overflow
static:
doAssert SLOTS_PER_EPOCH >= MIN_ATTESTATION_INCLUSION_DELAY
if attestation_slot + SLOTS_PER_EPOCH <= attestation_slot:
return err("attestation data.slot overflow, malicious?")
if not (attestation_slot + MIN_ATTESTATION_INCLUSION_DELAY <= current_slot):
return err("Attestation too new")
when consensusFork < ConsensusFork.Deneb:
if not (current_slot <= attestation_slot + SLOTS_PER_EPOCH):
return err("Attestation too old")
ok()
func check_attestation_index*(
index, committees_per_slot: uint64):
Result[CommitteeIndex, cstring] =
CommitteeIndex.init(index, committees_per_slot)
func check_attestation_index(
data: AttestationData, committees_per_slot: uint64):
Result[CommitteeIndex, cstring] =
check_attestation_index(data.index, committees_per_slot)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#get_attestation_participation_flag_indices
func get_attestation_participation_flag_indices(
state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState,
data: AttestationData, inclusion_delay: uint64): set[TimelyFlag] =
## Return the flag indices that are satisfied by an attestation.
let justified_checkpoint =
if data.target.epoch == get_current_epoch(state):
state.current_justified_checkpoint
else:
state.previous_justified_checkpoint
# Matching roots
let
is_matching_source = data.source == justified_checkpoint
is_matching_target =
is_matching_source and
data.target.root == get_block_root(state, data.target.epoch)
is_matching_head =
is_matching_target and
data.beacon_block_root == get_block_root_at_slot(state, data.slot)
# Checked by check_attestation()
doAssert is_matching_source
var participation_flag_indices: set[TimelyFlag]
if is_matching_source and inclusion_delay <=
static(integer_squareroot(SLOTS_PER_EPOCH)):
participation_flag_indices.incl(TIMELY_SOURCE_FLAG_INDEX)
if is_matching_target and inclusion_delay <= SLOTS_PER_EPOCH:
participation_flag_indices.incl(TIMELY_TARGET_FLAG_INDEX)
if is_matching_head and inclusion_delay == MIN_ATTESTATION_INCLUSION_DELAY:
participation_flag_indices.incl(TIMELY_HEAD_FLAG_INDEX)
participation_flag_indices
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/deneb/beacon-chain.md#modified-get_attestation_participation_flag_indices
func get_attestation_participation_flag_indices(
state: deneb.BeaconState | electra.BeaconState,
data: AttestationData, inclusion_delay: uint64): set[TimelyFlag] =
## Return the flag indices that are satisfied by an attestation.
let justified_checkpoint =
if data.target.epoch == get_current_epoch(state):
state.current_justified_checkpoint
else:
state.previous_justified_checkpoint
# Matching roots
let
is_matching_source = data.source == justified_checkpoint
is_matching_target =
is_matching_source and
data.target.root == get_block_root(state, data.target.epoch)
is_matching_head =
is_matching_target and
data.beacon_block_root == get_block_root_at_slot(state, data.slot)
# Checked by check_attestation
doAssert is_matching_source
var participation_flag_indices: set[TimelyFlag]
if is_matching_source and inclusion_delay <= integer_squareroot(SLOTS_PER_EPOCH):
participation_flag_indices.incl(TIMELY_SOURCE_FLAG_INDEX)
if is_matching_target: # [Modified in Deneb:EIP7045]
participation_flag_indices.incl(TIMELY_TARGET_FLAG_INDEX)
if is_matching_head and inclusion_delay == MIN_ATTESTATION_INCLUSION_DELAY:
participation_flag_indices.incl(TIMELY_HEAD_FLAG_INDEX)
participation_flag_indices
# TODO these aren't great here
# TODO these duplicate some stuff in state_transition_epoch which uses TotalBalances
# better to centralize around that if feasible
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/phase0/beacon-chain.md#get_total_active_balance
func get_total_active_balance*(state: ForkyBeaconState, cache: var StateCache): Gwei =
## Return the combined effective balance of the active validators.
## Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei
## minimum to avoid divisions by zero.
let epoch = state.get_current_epoch()
cache.total_active_balance.withValue(epoch, tab) do:
return tab[]
do:
let tab = get_total_balance(
state, cache.get_shuffled_active_validator_indices(state, epoch))
cache.total_active_balance[epoch] = tab
return tab
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#get_base_reward_per_increment
func get_base_reward_per_increment_sqrt(
total_active_balance_sqrt: uint64): Gwei =
EFFECTIVE_BALANCE_INCREMENT.Gwei * BASE_REWARD_FACTOR div
total_active_balance_sqrt
func get_base_reward_per_increment*(
total_active_balance: Gwei): Gwei =
get_base_reward_per_increment_sqrt(
integer_squareroot(distinctBase(total_active_balance)))
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#get_base_reward
func get_base_reward(
state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState |
deneb.BeaconState | electra.BeaconState,
index: ValidatorIndex, base_reward_per_increment: Gwei): Gwei =
## Return the base reward for the validator defined by ``index`` with respect
## to the current ``state``.
let increments =
state.validators[index].effective_balance div
EFFECTIVE_BALANCE_INCREMENT.Gwei
increments * base_reward_per_increment
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/phase0/beacon-chain.md#attestations
proc check_attestation*(
state: ForkyBeaconState, attestation: SomeAttestation, flags: UpdateFlags,
cache: var StateCache, on_chain: static bool = true): Result[void, cstring] =
## Check that an attestation follows the rules of being included in the state
## at the current slot. When acting as a proposer, the same rules need to
## be followed!
let
data = attestation.data
epoch = ? check_attestation_target_epoch(data, state.get_current_epoch())
slot = ? check_attestation_slot_target(data)
committee_index = ? check_attestation_index(
data,
get_committee_count_per_slot(state, epoch, cache))
? check_attestation_inclusion((typeof state).kind, slot, state.slot)
let committee_len = get_beacon_committee_len(
state, slot, committee_index, cache)
if attestation.aggregation_bits.lenu64 != committee_len:
return err("Inconsistent aggregation and committee length")
if epoch == get_current_epoch(state):
if not (data.source == state.current_justified_checkpoint):
return err("FFG data not matching current justified epoch")
else:
if not (data.source == state.previous_justified_checkpoint):
return err("FFG data not matching previous justified epoch")
? is_valid_indexed_attestation(state, attestation, flags, cache)
ok()
proc check_attestation*(
state: electra.BeaconState,
attestation: electra.Attestation | electra.TrustedAttestation,
flags: UpdateFlags, cache: var StateCache, on_chain: static bool): Result[void, cstring] =
## Check that an attestation follows the rules of being included in the state
## at the current slot. When acting as a proposer, the same rules need to
## be followed!
let
data = attestation.data
epoch = ? check_attestation_target_epoch(data, state.get_current_epoch())
slot = ? check_attestation_slot_target(data)
? check_attestation_inclusion((typeof state).kind, slot, state.slot)
# [Modified in Electra:EIP7549]
if not (data.index == 0):
return err("Electra attestation data index not 0")
when on_chain:
var participants_count = 0'u64
debugComment "cache doesn't know about forks"
for index in attestation.committee_bits.oneIndices:
if not (index.uint64 < get_committee_count_per_slot(
state, data.target.epoch, cache)):
return err("attestation wrong committee index len")
participants_count +=
get_beacon_committee_len(state, data.slot, index.CommitteeIndex, cache)
if not (lenu64(attestation.aggregation_bits) == participants_count):
return err("attestation wrong aggregation bit length")
else:
let
committee_index = get_committee_index_one(attestation.committee_bits).valueOr:
return err("Network attestation without single committee index")
if not (lenu64(attestation.aggregation_bits) ==
get_beacon_committee_len(state, data.slot, committee_index, cache)):
return err("attestation wrong aggregation bit length")
if epoch == get_current_epoch(state):
if not (data.source == state.current_justified_checkpoint):
return err("FFG data not matching current justified epoch")
else:
if not (data.source == state.previous_justified_checkpoint):
return err("FFG data not matching previous justified epoch")
? is_valid_indexed_attestation(state, attestation, flags, cache)
ok()
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/capella/beacon-chain.md#new-process_bls_to_execution_change
proc check_bls_to_execution_change*(
genesisFork: Fork,
state: capella.BeaconState | deneb.BeaconState | electra.BeaconState,
signed_address_change: SignedBLSToExecutionChange, flags: UpdateFlags):
Result[void, cstring] =
let address_change = signed_address_change.message
if not (address_change.validator_index < state.validators.lenu64):
return err("process_bls_to_execution_change: invalid validator index")
var withdrawal_credentials =
state.validators.item(address_change.validator_index).withdrawal_credentials
if not (withdrawal_credentials.data[0] == BLS_WITHDRAWAL_PREFIX):
return err("process_bls_to_execution_change: invalid withdrawal prefix")
if not (withdrawal_credentials.data.toOpenArray(1, 31) ==
eth2digest(address_change.from_bls_pubkey.blob).data.toOpenArray(1, 31)):
return err("process_bls_to_execution_change: invalid withdrawal credentials")
doAssert flags + {skipBlsValidation} == {skipBlsValidation}
if skipBlsValidation notin flags and
not verify_bls_to_execution_change_signature(
genesisFork, state.genesis_validators_root, signed_address_change,
address_change.from_bls_pubkey, signed_address_change.signature):
return err("process_bls_to_execution_change: invalid signature")
ok()
func get_proposer_reward*(
state: ForkyBeaconState,
attestation: SomeAttestation,
base_reward_per_increment: Gwei,
cache: var StateCache,
epoch_participation: var EpochParticipationFlags): Gwei =
let participation_flag_indices = get_attestation_participation_flag_indices(
state, attestation.data, state.slot - attestation.data.slot)
for index in get_attesting_indices_iter(
state, attestation.data, attestation.aggregation_bits, cache):
let
base_reward = get_base_reward(state, index, base_reward_per_increment)
for flag_index, weight in PARTICIPATION_FLAG_WEIGHTS:
if flag_index in participation_flag_indices and
not has_flag(epoch_participation.item(index), flag_index):
asList(epoch_participation)[index] =
add_flag(epoch_participation.item(index), flag_index)
# these are all valid; TODO statically verify or do it type-safely
result += base_reward * weight.uint64
let proposer_reward_denominator =
(WEIGHT_DENOMINATOR.uint64 - PROPOSER_WEIGHT.uint64) *
WEIGHT_DENOMINATOR.uint64 div PROPOSER_WEIGHT.uint64
result div proposer_reward_denominator
func get_proposer_reward*(
state: ForkyBeaconState,
attestation: electra.Attestation | electra.TrustedAttestation,
base_reward_per_increment: Gwei,
cache: var StateCache,
epoch_participation: var EpochParticipationFlags): Gwei =
let participation_flag_indices = get_attestation_participation_flag_indices(
state, attestation.data, state.slot - attestation.data.slot)
for index in get_attesting_indices_iter(
state, attestation.data, attestation.aggregation_bits, attestation.committee_bits, cache):
let
base_reward = get_base_reward(state, index, base_reward_per_increment)
for flag_index, weight in PARTICIPATION_FLAG_WEIGHTS:
if flag_index in participation_flag_indices and
not has_flag(epoch_participation.item(index), flag_index):
asList(epoch_participation)[index] =
add_flag(epoch_participation.item(index), flag_index)
# these are all valid; TODO statically verify or do it type-safely
result += base_reward * weight.uint64
let proposer_reward_denominator =
(WEIGHT_DENOMINATOR.uint64 - PROPOSER_WEIGHT.uint64) *
WEIGHT_DENOMINATOR.uint64 div PROPOSER_WEIGHT.uint64
result div proposer_reward_denominator
proc process_attestation*(
state: var ForkyBeaconState, attestation: SomeAttestation, flags: UpdateFlags,
base_reward_per_increment: Gwei, cache: var StateCache):
Result[Gwei, cstring] =
# In the spec, attestation validation is mixed with state mutation, so here
# we've split it into two functions so that the validation logic can be
# reused when looking for suitable blocks to include in attestations.
#
# TODO this should be two separate functions, but
# https://github.com/nim-lang/Nim/issues/18202 means that this being called
# by process_operations() in state_transition_block fails that way.
let proposer_index = get_beacon_proposer_index(state, cache).valueOr:
return err("process_attestation: no beacon proposer index and probably no active validators")
? check_attestation(state, attestation, flags, cache)
when state is phase0.BeaconState:
template addPendingAttestation(attestations: typed) =
# The genericSeqAssign generated by the compiler to copy the attestation
# data sadly is a processing hotspot - the business with the addDefault
# pointer is here simply to work around the poor codegen
let pa = attestations.addDefault()
if pa.isNil:
return err("process_attestation: too many pending attestations")
assign(pa[].aggregation_bits, attestation.aggregation_bits)
pa[].data = attestation.data
pa[].inclusion_delay = state.slot - attestation.data.slot
pa[].proposer_index = proposer_index.uint64
doAssert base_reward_per_increment == 0.Gwei
if attestation.data.target.epoch == get_current_epoch(state):
addPendingAttestation(state.current_epoch_attestations)
else:
addPendingAttestation(state.previous_epoch_attestations)
const proposer_reward = 0.Gwei
else:
template updateParticipationFlags(epoch_participation: untyped): Gwei =
let proposer_reward = get_proposer_reward(
state, attestation, base_reward_per_increment, cache, epoch_participation)
increase_balance(state, proposer_index, proposer_reward)
proposer_reward
doAssert base_reward_per_increment > 0.Gwei
let proposer_reward =
if attestation.data.target.epoch == get_current_epoch(state):
updateParticipationFlags(state.current_epoch_participation)
else:
updateParticipationFlags(state.previous_epoch_participation)
ok(proposer_reward)
proc process_attestation*(
state: var ForkyBeaconState,
attestation: electra.Attestation | electra.TrustedAttestation,
flags: UpdateFlags, base_reward_per_increment: Gwei,
cache: var StateCache): Result[Gwei, cstring] =
? check_attestation(state, attestation, flags, cache, true)
let proposer_index = get_beacon_proposer_index(state, cache).valueOr:
return err("process_attestation: no beacon proposer index and probably no active validators")
template updateParticipationFlags(epoch_participation: untyped): Gwei =
let proposer_reward = get_proposer_reward(
state, attestation, base_reward_per_increment, cache, epoch_participation)
increase_balance(state, proposer_index, proposer_reward)
proposer_reward
doAssert base_reward_per_increment > 0.Gwei
let proposer_reward =
if attestation.data.target.epoch == get_current_epoch(state):
updateParticipationFlags(state.current_epoch_participation)
else:
updateParticipationFlags(state.previous_epoch_participation)
ok(proposer_reward)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#get_next_sync_committee_indices
func get_next_sync_committee_keys(
state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState |
deneb.BeaconState | electra.BeaconState):
array[SYNC_COMMITTEE_SIZE, ValidatorPubKey] =
## Return the sequence of sync committee indices, with possible duplicates,
## for the next sync committee.
# The sync committe depends on seed and effective balance - it can
# thus only be computed for the current epoch of the state, after balance
# updates have been performed
let epoch = get_current_epoch(state) + 1
const MAX_RANDOM_BYTE = 255
let
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)
var
i = 0'u64
index = 0
res: array[SYNC_COMMITTEE_SIZE, ValidatorPubKey]
hash_buffer: array[40, byte]
hash_buffer[0..31] = seed.data
while index < SYNC_COMMITTEE_SIZE:
hash_buffer[32..39] = uint_to_bytes(uint64(i div 32))
let
shuffled_index = compute_shuffled_index(
uint64(i mod active_validator_count), active_validator_count, seed)
candidate_index = active_validator_indices[shuffled_index]
random_byte = eth2digest(hash_buffer).data[i mod 32]
effective_balance = state.validators[candidate_index].effective_balance
if effective_balance * MAX_RANDOM_BYTE >=
MAX_EFFECTIVE_BALANCE.Gwei * random_byte:
res[index] = state.validators[candidate_index].pubkey
inc index
i += 1'u64
res
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/capella/beacon-chain.md#has_eth1_withdrawal_credential
func has_eth1_withdrawal_credential*(validator: Validator): bool =
## Check if ``validator`` has an 0x01 prefixed "eth1" withdrawal credential.
validator.withdrawal_credentials.data[0] == ETH1_ADDRESS_WITHDRAWAL_PREFIX
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/capella/beacon-chain.md#is_fully_withdrawable_validator
func is_fully_withdrawable_validator(
validator: Validator, balance: Gwei, epoch: Epoch): bool =
## Check if ``validator`` is fully withdrawable.
has_eth1_withdrawal_credential(validator) and
validator.withdrawable_epoch <= epoch and balance > 0.Gwei
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/capella/beacon-chain.md#is_partially_withdrawable_validator
func is_partially_withdrawable_validator(
validator: Validator, balance: Gwei): bool =
## Check if ``validator`` is partially withdrawable.
let
has_max_effective_balance =
validator.effective_balance == MAX_EFFECTIVE_BALANCE.Gwei
has_excess_balance = balance > MAX_EFFECTIVE_BALANCE.Gwei
has_eth1_withdrawal_credential(validator) and
has_max_effective_balance and has_excess_balance
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-is_compounding_withdrawal_credential
func is_compounding_withdrawal_credential*(
withdrawal_credentials: Eth2Digest): bool =
withdrawal_credentials.data[0] == COMPOUNDING_WITHDRAWAL_PREFIX
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-has_compounding_withdrawal_credential
func has_compounding_withdrawal_credential*(validator: Validator): bool =
## Check if ``validator`` has an 0x02 prefixed "compounding" withdrawal
## credential.
is_compounding_withdrawal_credential(validator.withdrawal_credentials)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-has_execution_withdrawal_credential
func has_execution_withdrawal_credential*(validator: Validator): bool =
## Check if ``validator`` has a 0x01 or 0x02 prefixed withdrawal credential.
has_compounding_withdrawal_credential(validator) or
has_eth1_withdrawal_credential(validator)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#get_validator_max_effective_balance
func get_validator_max_effective_balance(validator: Validator): Gwei =
## Get max effective balance for ``validator``.
if has_compounding_withdrawal_credential(validator):
MAX_EFFECTIVE_BALANCE_ELECTRA.Gwei
else:
MIN_ACTIVATION_BALANCE.Gwei
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-get_active_balance
func get_active_balance*(
state: electra.BeaconState, validator_index: ValidatorIndex): Gwei =
let max_effective_balance =
get_validator_max_effective_balance(state.validators[validator_index])
min(state.balances[validator_index], max_effective_balance)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.1/specs/electra/beacon-chain.md#new-queue_excess_active_balance
func queue_excess_active_balance(
state: var electra.BeaconState, index: ValidatorIndex) =
let balance = state.balances.item(index)
if balance > MIN_ACTIVATION_BALANCE.Gwei:
let excess_balance = balance - MIN_ACTIVATION_BALANCE.Gwei
state.balances.mitem(index) = MIN_ACTIVATION_BALANCE.Gwei
debugComment "maybe check return value"
discard state.pending_balance_deposits.add(
PendingBalanceDeposit(index: index.uint64, amount: excess_balance)
)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-switch_to_compounding_validator
func switch_to_compounding_validator*(
state: var electra.BeaconState, index: ValidatorIndex) =
let validator = addr state.validators.mitem(index)
if has_eth1_withdrawal_credential(validator[]):
validator.withdrawal_credentials.data[0] = COMPOUNDING_WITHDRAWAL_PREFIX
queue_excess_active_balance(state, index)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.0/specs/electra/beacon-chain.md#new-get_pending_balance_to_withdraw
func get_pending_balance_to_withdraw*(
state: Electra.BeaconState, validator_index: ValidatorIndex): Gwei =
var pending_balance: Gwei
for withdrawal in state.pending_partial_withdrawals:
if withdrawal.index == validator_index:
pending_balance += withdrawal.amount
pending_balance
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/capella/beacon-chain.md#new-get_expected_withdrawals
func get_expected_withdrawals*(
state: capella.BeaconState | deneb.BeaconState | electra.BeaconState):
seq[Withdrawal] =
let
epoch = get_current_epoch(state)
num_validators = lenu64(state.validators)
var
withdrawal_index = state.next_withdrawal_index
validator_index = state.next_withdrawal_validator_index
withdrawals: seq[Withdrawal] = @[]
bound = min(len(state.validators), MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP)
for _ in 0 ..< bound:
let
validator = state.validators[validator_index]
balance = state.balances[validator_index]
if is_fully_withdrawable_validator(validator, balance, epoch):
var w = Withdrawal(
index: withdrawal_index,
validator_index: validator_index,
amount: balance)
w.address.data[0..19] = validator.withdrawal_credentials.data[12..^1]
withdrawals.add w
withdrawal_index = WithdrawalIndex(withdrawal_index + 1)
elif is_partially_withdrawable_validator(validator, balance):
var w = Withdrawal(
index: withdrawal_index,
validator_index: validator_index,
amount: balance - MAX_EFFECTIVE_BALANCE.Gwei)
w.address.data[0..19] = validator.withdrawal_credentials.data[12..^1]
withdrawals.add w
withdrawal_index = WithdrawalIndex(withdrawal_index + 1)
if len(withdrawals) == MAX_WITHDRAWALS_PER_PAYLOAD:
break
validator_index = (validator_index + 1) mod num_validators
withdrawals
# https://github.com/ethereum/consensus-specs/blob/v1.4.0/specs/altair/beacon-chain.md#get_next_sync_committee
func get_next_sync_committee*(
state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState |
deneb.BeaconState | electra.BeaconState):
SyncCommittee =
## Return the next sync committee, with possible pubkey duplicates.
var res: SyncCommittee
res.pubkeys.data = get_next_sync_committee_keys(state)
# see signatures_batch, TODO shouldn't be here
# Deposit processing ensures all keys are valid
var attestersAgg: AggregatePublicKey
attestersAgg.init(res.pubkeys.data[0].load().get)
for i in 1 ..< res.pubkeys.data.len:
attestersAgg.aggregate(res.pubkeys.data[i].load().get)
res.aggregate_pubkey = finish(attestersAgg).toPubKey()
res
func compute_deposit_root(deposits: openArray[DepositData]): Eth2Digest =
var merkleizer = createMerkleizer2(DEPOSIT_CONTRACT_TREE_DEPTH + 1)
for i, deposit in deposits:
let htr = hash_tree_root(deposit)
merkleizer.addChunk(htr.data)
mixInLength(merkleizer.getFinalHash(), deposits.len)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-alpha.3/specs/phase0/beacon-chain.md#genesis
proc initialize_beacon_state_from_eth1(
cfg: RuntimeConfig,
eth1_block_hash: Eth2Digest,
eth1_timestamp: uint64,
deposits: openArray[DepositData],
flags: UpdateFlags = {}): phase0.BeaconState =
## Get the genesis ``BeaconState``.
##
## Before the beacon chain starts, validators will register in the Eth1 chain
## and deposit ETH. When enough many validators have registered, a
## `ChainStart` log will be emitted and the beacon chain can start beaconing.
##
## Because the state root hash is part of the genesis block, the beacon state
## must be calculated before creating the genesis block.
# Induct validators
# Not in spec: the system doesn't work unless there are at least SLOTS_PER_EPOCH
# validators - there needs to be at least one member in each committee -
# good to know for testing, though arguably the system is not that useful at
# that point :)
doAssert deposits.lenu64 >= SLOTS_PER_EPOCH
# TODO https://github.com/nim-lang/Nim/issues/19094
template state(): untyped = result
state = phase0.BeaconState(
fork: genesisFork(cfg),
genesis_time: genesis_time_from_eth1_timestamp(cfg, eth1_timestamp),
eth1_data:Eth1Data(
deposit_count: deposits.lenu64,
deposit_root: compute_deposit_root(deposits),
block_hash: eth1_block_hash),
eth1_deposit_index: deposits.lenu64,
latest_block_header:
BeaconBlockHeader(
body_root: hash_tree_root(default(phase0.BeaconBlockBody))))
# Seed RANDAO with Eth1 entropy
state.randao_mixes.fill(eth1_block_hash)
var pubkeyToIndex = initTable[ValidatorPubKey, ValidatorIndex]()
for idx, deposit in deposits:
let
pubkey = deposit.pubkey
amount = deposit.amount
pubkeyToIndex.withValue(pubkey, foundIdx) do:
# Increase balance by deposit amount
increase_balance(state, foundIdx[], amount)
do:
if skipBlsValidation in flags or
verify_deposit_signature(cfg, deposit):
pubkeyToIndex[pubkey] = ValidatorIndex(state.validators.len)
if not state.validators.add(get_validator_from_deposit(state, deposit)):
raiseAssert "too many validators"
if not state.balances.add(amount):
raiseAssert "same as validators"
else:
# Invalid deposits are perfectly possible
trace "Skipping deposit with invalid signature",
deposit = shortLog(deposit)
# Process activations
for vidx in state.validators.vindices:
let
balance = state.balances.item(vidx)
validator = addr state.validators.mitem(vidx)
validator.effective_balance = min(
balance - balance mod EFFECTIVE_BALANCE_INCREMENT.Gwei,
MAX_EFFECTIVE_BALANCE.Gwei)
if validator.effective_balance == MAX_EFFECTIVE_BALANCE.Gwei:
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)
# TODO https://github.com/nim-lang/Nim/issues/19094
# state
proc initialize_hashed_beacon_state_from_eth1*(
cfg: RuntimeConfig,
eth1_block_hash: Eth2Digest,
eth1_timestamp: uint64,
deposits: openArray[DepositData],
flags: UpdateFlags = {}): phase0.HashedBeaconState =
# TODO https://github.com/nim-lang/Nim/issues/19094
result = phase0.HashedBeaconState(
data: initialize_beacon_state_from_eth1(
cfg, eth1_block_hash, eth1_timestamp, deposits, flags))
result.root = hash_tree_root(result.data)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/bellatrix/beacon-chain.md#testing
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.2/specs/capella/beacon-chain.md#testing
# https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/deneb/beacon-chain.md#testing
proc initialize_beacon_state_from_eth1*(
cfg: RuntimeConfig,
eth1_block_hash: Eth2Digest,
eth1_timestamp: uint64,
deposits: openArray[DepositData],
execution_payload_header: ForkyExecutionPayloadHeader,
flags: UpdateFlags = {}): auto =
## Get the genesis ``BeaconState``.
##
## Before the beacon chain starts, validators will register in the Eth1 chain
## and deposit ETH. When enough many validators have registered, a
## `ChainStart` log will be emitted and the beacon chain can start beaconing.
##
## Because the state root hash is part of the genesis block, the beacon state
## must be calculated before creating the genesis block.
# Induct validators
# Not in spec: the system doesn't work unless there are at least SLOTS_PER_EPOCH
# validators - there needs to be at least one member in each committee -
# good to know for testing, though arguably the system is not that useful at
# at that point :)
doAssert deposits.lenu64 >= SLOTS_PER_EPOCH
const consensusFork = typeof(execution_payload_header).kind
let
forkVersion = cfg.forkVersion(consensusFork)
fork = Fork(
previous_version: forkVersion,
current_version: forkVersion,
epoch: GENESIS_EPOCH)
# TODO https://github.com/nim-lang/Nim/issues/19094
template state(): untyped = result
result = consensusFork.BeaconState(
fork: fork,
genesis_time: genesis_time_from_eth1_timestamp(cfg, eth1_timestamp),
eth1_data: Eth1Data(
deposit_count: deposits.lenu64,
deposit_root: compute_deposit_root(deposits),
block_hash: eth1_block_hash),
eth1_deposit_index: deposits.lenu64,
latest_block_header: BeaconBlockHeader(
body_root: hash_tree_root(default consensusFork.BeaconBlockBody)))
# Seed RANDAO with Eth1 entropy
state.randao_mixes.data.fill(eth1_block_hash)
var pubkeyToIndex = initTable[ValidatorPubKey, ValidatorIndex]()
for idx, deposit in deposits:
let
pubkey = deposit.pubkey
amount = deposit.amount
pubkeyToIndex.withValue(pubkey, foundIdx) do:
# Increase balance by deposit amount
increase_balance(state, foundIdx[], amount)
do:
if skipBlsValidation in flags or
verify_deposit_signature(cfg, deposit):
pubkeyToIndex[pubkey] = ValidatorIndex(state.validators.len)
if not state.validators.add get_validator_from_deposit(state, deposit):
raiseAssert "too many validators"
if not state.balances.add(amount):
raiseAssert "same as validators"
else:
# Invalid deposits are perfectly possible
trace "Skipping deposit with invalid signature",
deposit = shortLog(deposit)
# Initialize epoch participations - TODO (This must be added to the spec)
var
empty_participation: EpochParticipationFlags
inactivity_scores = HashList[uint64, Limit VALIDATOR_REGISTRY_LIMIT]()
doAssert empty_participation.asList.setLen(state.validators.len)
doAssert inactivity_scores.data.setLen(state.validators.len)
inactivity_scores.resetCache()
state.previous_epoch_participation = empty_participation
state.current_epoch_participation = empty_participation
state.inactivity_scores = inactivity_scores
# Process activations
for vidx in state.validators.vindices:
let
balance = state.balances.item(vidx)
validator = addr state.validators.mitem(vidx)
validator.effective_balance = min(
balance - balance mod EFFECTIVE_BALANCE_INCREMENT.Gwei,
MAX_EFFECTIVE_BALANCE.Gwei)
if validator.effective_balance == MAX_EFFECTIVE_BALANCE.Gwei:
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)
# [New in Bellatrix] Initialize the execution payload header
# If empty, will initialize a chain that has not yet gone through the Merge transition
state.latest_execution_payload_header = execution_payload_header
# TODO https://github.com/nim-lang/Nim/issues/19094
# state
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/altair/fork.md#upgrading-the-state
func translate_participation(
state: var altair.BeaconState,
pending_attestations: openArray[phase0.PendingAttestation]) =
var cache = StateCache()
for attestation in pending_attestations:
let
data = attestation.data
inclusion_delay = attestation.inclusion_delay
# Translate attestation inclusion info to flag indices
participation_flag_indices =
get_attestation_participation_flag_indices(state, data, inclusion_delay)
# Apply flags to all attesting validators
for index in get_attesting_indices_iter(
state, data, attestation.aggregation_bits, cache):
for flag_index in participation_flag_indices:
state.previous_epoch_participation[index] =
add_flag(state.previous_epoch_participation.item(index), flag_index)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.1/specs/electra/beacon-chain.md#new-queue_entire_balance_and_reset_validator
func queue_entire_balance_and_reset_validator(
state: var electra.BeaconState, index: uint64) =
let balance = state.balances.item(index)
state.balances[index] = 0.Gwei
let validator = addr state.validators.mitem(index)
validator[].effective_balance = 0.Gwei
validator[].activation_eligibility_epoch = FAR_FUTURE_EPOCH
debugComment "check hashlist add return"
discard state.pending_balance_deposits.add PendingBalanceDeposit(
index: index, amount: balance)
func upgrade_to_altair*(cfg: RuntimeConfig, pre: phase0.BeaconState):
ref altair.BeaconState =
var
empty_participation: EpochParticipationFlags
inactivity_scores = HashList[uint64, Limit VALIDATOR_REGISTRY_LIMIT]()
doAssert empty_participation.asList.setLen(pre.validators.len)
doAssert inactivity_scores.data.setLen(pre.validators.len)
inactivity_scores.resetCache()
let post = (ref altair.BeaconState)(
genesis_time: pre.genesis_time,
genesis_validators_root: pre.genesis_validators_root,
slot: pre.slot,
fork: altairFork(cfg),
# History
latest_block_header: pre.latest_block_header,
block_roots: pre.block_roots,
state_roots: pre.state_roots,
historical_roots: pre.historical_roots,
# Eth1
eth1_data: pre.eth1_data,
eth1_data_votes: pre.eth1_data_votes,
eth1_deposit_index: pre.eth1_deposit_index,
# Registry
validators: pre.validators,
balances: pre.balances,
# Randomness
randao_mixes: pre.randao_mixes,
# Slashings
slashings: pre.slashings,
# Attestations
previous_epoch_participation: empty_participation,
current_epoch_participation: empty_participation,
# Finality
justification_bits: pre.justification_bits,
previous_justified_checkpoint: pre.previous_justified_checkpoint,
current_justified_checkpoint: pre.current_justified_checkpoint,
finalized_checkpoint: pre.finalized_checkpoint,
# Inactivity
inactivity_scores: inactivity_scores
)
# Fill in previous epoch participation from the pre state's pending
# attestations
translate_participation(post[], pre.previous_epoch_attestations.asSeq)
# Fill in sync committees
# Note: A duplicate committee is assigned for the current and next committee
# at the fork boundary
post[].current_sync_committee = get_next_sync_committee(post[])
post[].next_sync_committee = get_next_sync_committee(post[])
post
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/bellatrix/fork.md#upgrading-the-state
func upgrade_to_bellatrix*(cfg: RuntimeConfig, pre: altair.BeaconState):
ref bellatrix.BeaconState =
let epoch = get_current_epoch(pre)
(ref bellatrix.BeaconState)(
# Versioning
genesis_time: pre.genesis_time,
genesis_validators_root: pre.genesis_validators_root,
slot: pre.slot,
fork: Fork(
previous_version: pre.fork.current_version,
current_version: cfg.BELLATRIX_FORK_VERSION,
epoch: epoch,
),
# History
latest_block_header: pre.latest_block_header,
block_roots: pre.block_roots,
state_roots: pre.state_roots,
historical_roots: pre.historical_roots,
# Eth1
eth1_data: pre.eth1_data,
eth1_data_votes: pre.eth1_data_votes,
eth1_deposit_index: pre.eth1_deposit_index,
# Registry
validators: pre.validators,
balances: pre.balances,
# Randomness
randao_mixes: pre.randao_mixes,
# Slashings
slashings: pre.slashings,
# Participation
previous_epoch_participation: pre.previous_epoch_participation,
current_epoch_participation: pre.current_epoch_participation,
# Finality
justification_bits: pre.justification_bits,
previous_justified_checkpoint: pre.previous_justified_checkpoint,
current_justified_checkpoint: pre.current_justified_checkpoint,
finalized_checkpoint: pre.finalized_checkpoint,
# Inactivity
inactivity_scores: pre.inactivity_scores,
# Sync
current_sync_committee: pre.current_sync_committee,
next_sync_committee: pre.next_sync_committee,
# Execution-layer
latest_execution_payload_header: default(bellatrix.ExecutionPayloadHeader)
)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.1/specs/capella/fork.md#upgrading-the-state
func upgrade_to_capella*(cfg: RuntimeConfig, pre: bellatrix.BeaconState):
ref capella.BeaconState =
let
epoch = get_current_epoch(pre)
latest_execution_payload_header = capella.ExecutionPayloadHeader(
parent_hash: pre.latest_execution_payload_header.parent_hash,
fee_recipient: pre.latest_execution_payload_header.fee_recipient,
state_root: pre.latest_execution_payload_header.state_root,
receipts_root: pre.latest_execution_payload_header.receipts_root,
logs_bloom: pre.latest_execution_payload_header.logs_bloom,
prev_randao: pre.latest_execution_payload_header.prev_randao,
block_number: pre.latest_execution_payload_header.block_number,
gas_limit: pre.latest_execution_payload_header.gas_limit,
gas_used: pre.latest_execution_payload_header.gas_used,
timestamp: pre.latest_execution_payload_header.timestamp,
extra_data: pre.latest_execution_payload_header.extra_data,
base_fee_per_gas: pre.latest_execution_payload_header.base_fee_per_gas,
block_hash: pre.latest_execution_payload_header.block_hash,
transactions_root: pre.latest_execution_payload_header.transactions_root,
withdrawals_root: Eth2Digest() # [New in Capella]
)
(ref capella.BeaconState)(
# Versioning
genesis_time: pre.genesis_time,
genesis_validators_root: pre.genesis_validators_root,
slot: pre.slot,
fork: Fork(
previous_version: pre.fork.current_version,
current_version: cfg.CAPELLA_FORK_VERSION,
epoch: epoch,
),
# History
latest_block_header: pre.latest_block_header,
block_roots: pre.block_roots,
state_roots: pre.state_roots,
historical_roots: pre.historical_roots,
# Eth1
eth1_data: pre.eth1_data,
eth1_data_votes: pre.eth1_data_votes,
eth1_deposit_index: pre.eth1_deposit_index,
# Registry
validators: pre.validators,
balances: pre.balances,
# Randomness
randao_mixes: pre.randao_mixes,
# Slashings
slashings: pre.slashings,
# Participation
previous_epoch_participation: pre.previous_epoch_participation,
current_epoch_participation: pre.current_epoch_participation,
# Finality
justification_bits: pre.justification_bits,
previous_justified_checkpoint: pre.previous_justified_checkpoint,
current_justified_checkpoint: pre.current_justified_checkpoint,
finalized_checkpoint: pre.finalized_checkpoint,
# Inactivity
inactivity_scores: pre.inactivity_scores,
# Sync
current_sync_committee: pre.current_sync_committee,
next_sync_committee: pre.next_sync_committee,
# Execution-layer
latest_execution_payload_header: latest_execution_payload_header,
# Withdrawals
next_withdrawal_index: 0,
next_withdrawal_validator_index: 0
# Deep history valid from Capella onwards [New in Capella]
# historical_summaries initialized to correct default automatically
)
# https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.6/specs/deneb/fork.md#upgrading-the-state
func upgrade_to_deneb*(cfg: RuntimeConfig, pre: capella.BeaconState):
ref deneb.BeaconState =
let
epoch = get_current_epoch(pre)
latest_execution_payload_header = deneb.ExecutionPayloadHeader(
parent_hash: pre.latest_execution_payload_header.parent_hash,
fee_recipient: pre.latest_execution_payload_header.fee_recipient,
state_root: pre.latest_execution_payload_header.state_root,
receipts_root: pre.latest_execution_payload_header.receipts_root,
logs_bloom: pre.latest_execution_payload_header.logs_bloom,
prev_randao: pre.latest_execution_payload_header.prev_randao,
block_number: pre.latest_execution_payload_header.block_number,
gas_limit: pre.latest_execution_payload_header.gas_limit,
gas_used: pre.latest_execution_payload_header.gas_used,
timestamp: pre.latest_execution_payload_header.timestamp,
extra_data: pre.latest_execution_payload_header.extra_data,
base_fee_per_gas: pre.latest_execution_payload_header.base_fee_per_gas,
block_hash: pre.latest_execution_payload_header.block_hash,
transactions_root: pre.latest_execution_payload_header.transactions_root,
withdrawals_root: pre.latest_execution_payload_header.withdrawals_root,
blob_gas_used: 0, # [New in Deneb]
excess_blob_gas: 0 # [New in Deneb]
)
(ref deneb.BeaconState)(
# Versioning
genesis_time: pre.genesis_time,
genesis_validators_root: pre.genesis_validators_root,
slot: pre.slot,
fork: Fork(
previous_version: pre.fork.current_version,
current_version: cfg.DENEB_FORK_VERSION, # [Modified in Deneb]
epoch: epoch
),
# History
latest_block_header: pre.latest_block_header,
block_roots: pre.block_roots,
state_roots: pre.state_roots,
historical_roots: pre.historical_roots,
# Eth1
eth1_data: pre.eth1_data,
eth1_data_votes: pre.eth1_data_votes,
eth1_deposit_index: pre.eth1_deposit_index,
# Registry
validators: pre.validators,
balances: pre.balances,
# Randomness
randao_mixes: pre.randao_mixes,
# Slashings
slashings: pre.slashings,
# Participation
previous_epoch_participation: pre.previous_epoch_participation,
current_epoch_participation: pre.current_epoch_participation,
# Finality
justification_bits: pre.justification_bits,
previous_justified_checkpoint: pre.previous_justified_checkpoint,
current_justified_checkpoint: pre.current_justified_checkpoint,
finalized_checkpoint: pre.finalized_checkpoint,
# Inactivity
inactivity_scores: pre.inactivity_scores,
# Sync
current_sync_committee: pre.current_sync_committee,
next_sync_committee: pre.next_sync_committee,
# Execution-layer
latest_execution_payload_header: latest_execution_payload_header, # [Modified in Deneb]
# Withdrawals
next_withdrawal_index: pre.next_withdrawal_index,
next_withdrawal_validator_index: pre.next_withdrawal_validator_index,
# Deep history valid from Capella onwards
historical_summaries: pre.historical_summaries
)
# https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.1/specs/electra/fork.md#upgrading-the-state
func upgrade_to_electra*(
cfg: RuntimeConfig, pre: deneb.BeaconState, cache: var StateCache):
ref electra.BeaconState =
let
epoch = get_current_epoch(pre)
latest_execution_payload_header = electra.ExecutionPayloadHeader(
parent_hash: pre.latest_execution_payload_header.parent_hash,
fee_recipient: pre.latest_execution_payload_header.fee_recipient,
state_root: pre.latest_execution_payload_header.state_root,
receipts_root: pre.latest_execution_payload_header.receipts_root,
logs_bloom: pre.latest_execution_payload_header.logs_bloom,
prev_randao: pre.latest_execution_payload_header.prev_randao,
block_number: pre.latest_execution_payload_header.block_number,
gas_limit: pre.latest_execution_payload_header.gas_limit,
gas_used: pre.latest_execution_payload_header.gas_used,
timestamp: pre.latest_execution_payload_header.timestamp,
extra_data: pre.latest_execution_payload_header.extra_data,
base_fee_per_gas: pre.latest_execution_payload_header.base_fee_per_gas,
block_hash: pre.latest_execution_payload_header.block_hash,
transactions_root: pre.latest_execution_payload_header.transactions_root,
withdrawals_root: pre.latest_execution_payload_header.withdrawals_root,
blob_gas_used: 0,
excess_blob_gas: 0,
deposit_receipts_root: ZERO_HASH, # [New in Electra:EIP6110]
withdrawal_requests_root: ZERO_HASH, # [New in ELectra:EIP7002]
)
var max_exit_epoch = FAR_FUTURE_EPOCH
for v in pre.validators:
if v.exit_epoch != FAR_FUTURE_EPOCH:
max_exit_epoch =
if max_exit_epoch == FAR_FUTURE_EPOCH:
v.exit_epoch
else:
max(max_exit_epoch, v.exit_epoch)
if max_exit_epoch == FAR_FUTURE_EPOCH:
max_exit_epoch = get_current_epoch(pre)
let earliest_exit_epoch = max_exit_epoch + 1
let post = (ref electra.BeaconState)(
# Versioning
genesis_time: pre.genesis_time,
genesis_validators_root: pre.genesis_validators_root,
slot: pre.slot,
fork: Fork(
previous_version: pre.fork.current_version,
current_version: cfg.ELECTRA_FORK_VERSION, # [Modified in Electra:EIP6110]
epoch: epoch
),
# History
latest_block_header: pre.latest_block_header,
block_roots: pre.block_roots,
state_roots: pre.state_roots,
historical_roots: pre.historical_roots,
# Eth1
eth1_data: pre.eth1_data,
eth1_data_votes: pre.eth1_data_votes,
eth1_deposit_index: pre.eth1_deposit_index,
# Registry
validators: pre.validators,
balances: pre.balances,
# Randomness
randao_mixes: pre.randao_mixes,
# Slashings
slashings: pre.slashings,
# Participation
previous_epoch_participation: pre.previous_epoch_participation,
current_epoch_participation: pre.current_epoch_participation,
# Finality
justification_bits: pre.justification_bits,
previous_justified_checkpoint: pre.previous_justified_checkpoint,
current_justified_checkpoint: pre.current_justified_checkpoint,
finalized_checkpoint: pre.finalized_checkpoint,
# Inactivity
inactivity_scores: pre.inactivity_scores,
# Sync
current_sync_committee: pre.current_sync_committee,
next_sync_committee: pre.next_sync_committee,
# Execution-layer
latest_execution_payload_header: latest_execution_payload_header,
# Withdrawals
next_withdrawal_index: pre.next_withdrawal_index,
next_withdrawal_validator_index: pre.next_withdrawal_validator_index,
# Deep history valid from Capella onwards
historical_summaries: pre.historical_summaries,
# [New in Electra:EIP6110]
deposit_receipts_start_index: UNSET_DEPOSIT_RECEIPTS_START_INDEX,
# [New in Electra:EIP7251]
deposit_balance_to_consume: 0.Gwei,
exit_balance_to_consume: 0.Gwei,
earliest_exit_epoch: earliest_exit_epoch,
consolidation_balance_to_consume: 0.Gwei,
earliest_consolidation_epoch:
compute_activation_exit_epoch(get_current_epoch(pre))
# pending_balance_deposits, pending_partial_withdrawals, and
# pending_consolidations are default empty lists
)
post.exit_balance_to_consume =
get_activation_exit_churn_limit(cfg, post[], cache)
post.consolidation_balance_to_consume =
get_consolidation_churn_limit(cfg, post[], cache)
# [New in Electra:EIP7251]
# add validators that are not yet active to pending balance deposits
var pre_activation: seq[(Epoch, uint64)]
for index, validator in post.validators:
if validator.activation_epoch == FAR_FUTURE_EPOCH:
pre_activation.add((validator.activation_eligibility_epoch, index.uint64))
sort(pre_activation)
for (_, index) in pre_activation:
queue_entire_balance_and_reset_validator(post[], index)
# Ensure early adopters of compounding credentials go through the activation
# churn
for index, validator in post.validators:
if has_compounding_withdrawal_credential(validator):
debugComment "in theory truncating"
queue_excess_active_balance(post[], ValidatorIndex(index))
post
func latest_block_root(state: ForkyBeaconState, state_root: Eth2Digest):
Eth2Digest =
# The root of the last block that was successfully applied to this state -
# normally, when a block is applied, the data from the header is stored in
# the state without the state root - on the next process_slot, the state root
# is added to the header and the block root can now be computed and added to
# the block roots table. If process_slot has not yet run on top of the new
# block, we must fill in the state root ourselves.
if state.slot == state.latest_block_header.slot:
# process_slot will not yet have updated the header of the "current" block -
# similar to block creation, we fill it in with the state root
var tmp = state.latest_block_header
tmp.state_root = state_root
hash_tree_root(tmp)
elif state.slot <=
(state.latest_block_header.slot + SLOTS_PER_HISTORICAL_ROOT):
# block_roots is limited to about a day - see assert in
# `get_block_root_at_slot`
state.get_block_root_at_slot(state.latest_block_header.slot)
else:
# Reallly long periods of empty slots - unlikely but possible
hash_tree_root(state.latest_block_header)
func latest_block_root*(state: ForkyHashedBeaconState): Eth2Digest =
latest_block_root(state.data, state.root)
func latest_block_root*(state: ForkedHashedBeaconState): Eth2Digest =
withState(state): latest_block_root(forkyState)
func get_sync_committee_cache*(
state: altair.BeaconState | bellatrix.BeaconState | capella.BeaconState |
deneb.BeaconState | electra.BeaconState,
cache: var StateCache): SyncCommitteeCache =
let period = state.slot.sync_committee_period()
cache.sync_committees.withValue(period, v) do:
return v[]
var
s = toHashSet(state.current_sync_committee.pubkeys.data)
for pk in state.next_sync_committee.pubkeys.data:
s.incl(pk)
var pubkeyIndices: Table[ValidatorPubKey, ValidatorIndex]
for vidx in state.validators.vindices:
let pubkey = state.validators[vidx].pubkey
if pubkey in s:
pubkeyIndices[pubkey] = vidx
var res: SyncCommitteeCache
try:
for i in 0..<res.current_sync_committee.len():
res.current_sync_committee[i] =
pubkeyIndices[state.current_sync_committee.pubkeys[i]]
res.next_sync_committee[i] =
pubkeyIndices[state.next_sync_committee.pubkeys[i]]
except KeyError:
raiseAssert "table constructed just above"
cache.sync_committees[period] = res
res
func dependent_root*(state: ForkyHashedBeaconState, epoch: Epoch): Eth2Digest =
## Return the root of the last block that contributed to the shuffling in the
## given epoch
if epoch > state.data.slot.epoch:
state.latest_block_root
elif epoch == Epoch(0):
if state.data.slot == Slot(0):
state.latest_block_root
else:
state.data.get_block_root_at_slot(Slot(0))
else:
let dependent_slot = epoch.start_slot - 1
if state.data.slot <= dependent_slot + SLOTS_PER_HISTORICAL_ROOT:
state.data.get_block_root_at_slot(epoch.start_slot - 1)
else:
Eth2Digest() # "don't know"
func proposer_dependent_root*(state: ForkyHashedBeaconState): Eth2Digest =
state.dependent_root(state.data.slot.epoch)
func attester_dependent_root*(state: ForkyHashedBeaconState): Eth2Digest =
state.dependent_root(state.data.slot.epoch.get_previous_epoch)
func latest_block_id*(state: ForkyHashedBeaconState): BlockId =
## Block id of the latest block applied to this state
BlockId(
root: state.latest_block_root,
slot: state.data.latest_block_header.slot)
func latest_block_id*(state: ForkedHashedBeaconState): BlockId =
## Block id of the latest block applied to this state
withState(state): forkyState.latest_block_id()
func matches_block(
state: ForkyHashedBeaconState, block_root: Eth2Digest): bool =
## Return true iff the latest block applied to this state matches the given
## `block_root`
block_root == state.latest_block_root
func matches_block*(
state: ForkedHashedBeaconState, block_root: Eth2Digest): bool =
withState(state): forkyState.matches_block(block_root)
func matches_block_slot(
state: ForkyHashedBeaconState, block_root: Eth2Digest, slot: Slot): bool =
## Return true iff the latest block applied to this state matches the given
## `block_root` and the state slot has been advanced to the given slot
slot == state.data.slot and block_root == state.latest_block_root
func matches_block_slot*(
state: ForkedHashedBeaconState, block_root: Eth2Digest, slot: Slot): bool =
withState(state): forkyState.matches_block_slot(block_root, slot)
func can_advance_slots(
state: ForkyHashedBeaconState, block_root: Eth2Digest, target_slot: Slot): bool =
## Return true iff we can reach the given block/slot combination simply by
## advancing 0 or more slots
target_slot >= state.data.slot and block_root == state.latest_block_root
func can_advance_slots*(
state: ForkedHashedBeaconState, block_root: Eth2Digest, target_slot: Slot): bool =
withState(state): forkyState.can_advance_slots(block_root, target_slot)
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