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nimbus-eth2/beacon_chain/spec/state_transition_epoch.nim
Etan Kissling 2a2bcea70d
group justified and finalized Checkpoint (#3841) 
The justified and finalized `Checkpoint` are frequently passed around
together. This introduces a new `FinalityCheckpoint` data structure that
combines them into one.

Due to the large usage of this structure in fork choice, also took this
opportunity to update fork choice tests to the latest v1.2.0-rc.1 spec.
Many additional tests enabled, some need more work, e.g. EL mock blocks.
Also implemented `discard_equivocations` which was skipped in #3661,
and improved code reuse across fork choice logic while at it.
2022-07-06 13:33:02 +03:00

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# beacon_chain
# Copyright (c) 2018-2022 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.
# State transition - epoch processing, as described in
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#epoch-processing and
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#epoch-processing
#
# The entry point is `process_epoch`, which is at the bottom of this file.
#
# General notes about the code:
# * Weird styling - the sections taken from the spec use python styling while
# the others use NEP-1 - helps grepping identifiers in spec
# * When updating the code, add TODO sections to mark where there are clear
# improvements to be made - other than that, keep things similar to spec unless
# motivated by security or performance considerations
{.push raises: [Defect].}
import
std/[algorithm, math],
stew/bitops2, chronicles,
../extras,
./datatypes/[phase0, altair, bellatrix],
"."/[beaconstate, eth2_merkleization, helpers, validator]
export extras, phase0, altair
# Logging utilities
# --------------------------------------------------------
logScope: topics = "consens"
# Accessors that implement the max condition in `get_total_balance`:
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#get_total_balance
template current_epoch*(v: TotalBalances): Gwei =
max(EFFECTIVE_BALANCE_INCREMENT, v.current_epoch_raw)
template previous_epoch*(v: TotalBalances): Gwei =
max(EFFECTIVE_BALANCE_INCREMENT, v.previous_epoch_raw)
template current_epoch_attesters*(v: TotalBalances): Gwei =
max(EFFECTIVE_BALANCE_INCREMENT, v.current_epoch_attesters_raw)
template current_epoch_target_attesters*(v: TotalBalances): Gwei =
max(EFFECTIVE_BALANCE_INCREMENT, v.current_epoch_target_attesters_raw)
template previous_epoch_attesters*(v: TotalBalances): Gwei =
max(EFFECTIVE_BALANCE_INCREMENT, v.previous_epoch_attesters_raw)
template previous_epoch_target_attesters*(v: TotalBalances): Gwei =
max(EFFECTIVE_BALANCE_INCREMENT, v.previous_epoch_target_attesters_raw)
template previous_epoch_head_attesters*(v: TotalBalances): Gwei =
max(EFFECTIVE_BALANCE_INCREMENT, v.previous_epoch_head_attesters_raw)
func init*(info: var phase0.EpochInfo, state: phase0.BeaconState) =
info.balances = TotalBalances()
info.validators.setLen(state.validators.len)
for i in 0..<state.validators.len:
let v = unsafeAddr state.validators[i]
var flags: set[RewardFlags]
if v[].slashed:
flags.incl(RewardFlags.isSlashed)
if state.get_current_epoch() >= v[].withdrawable_epoch:
flags.incl RewardFlags.canWithdrawInCurrentEpoch
if v[].is_active_validator(state.get_current_epoch()):
info.balances.current_epoch_raw += v[].effective_balance
if v[].is_active_validator(state.get_previous_epoch()):
flags.incl RewardFlags.isActiveInPreviousEpoch
info.balances.previous_epoch_raw += v[].effective_balance
info.validators[i] = RewardStatus(
current_epoch_effective_balance: v[].effective_balance,
flags: flags,
)
func add(a: var RewardDelta, b: RewardDelta) =
a.rewards += b.rewards
a.penalties += b.penalties
func process_attestation(
info: var phase0.EpochInfo, state: phase0.BeaconState, a: PendingAttestation,
cache: var StateCache) =
# Collect information about the attestation
var
flags: set[RewardFlags]
is_previous_epoch_attester: Option[InclusionInfo]
if a.data.target.epoch == state.get_current_epoch():
flags.incl RewardFlags.isCurrentEpochAttester
if a.data.target.root == get_block_root(state, state.get_current_epoch()):
flags.incl RewardFlags.isCurrentEpochTargetAttester
elif a.data.target.epoch == state.get_previous_epoch():
is_previous_epoch_attester = some(InclusionInfo(
delay: a.inclusion_delay,
proposer_index: a.proposer_index,
))
if a.data.target.root == get_block_root(state, state.get_previous_epoch()):
flags.incl RewardFlags.isPreviousEpochTargetAttester
if a.data.beacon_block_root == get_block_root_at_slot(state, a.data.slot):
flags.incl RewardFlags.isPreviousEpochHeadAttester
# Update the cache for all participants
for validator_index in get_attesting_indices(
state, a.data, a.aggregation_bits, cache):
template v(): untyped = info.validators[validator_index]
v.flags = v.flags + flags
if is_previous_epoch_attester.isSome:
if v.is_previous_epoch_attester.isSome:
if is_previous_epoch_attester.get().delay <
v.is_previous_epoch_attester.get().delay:
v.is_previous_epoch_attester = is_previous_epoch_attester
else:
v.is_previous_epoch_attester = is_previous_epoch_attester
func process_attestations*(
info: var phase0.EpochInfo, state: phase0.BeaconState, cache: var StateCache) =
# Walk state attestations and update the status information
for a in state.previous_epoch_attestations:
process_attestation(info, state, a, cache)
for a in state.current_epoch_attestations:
process_attestation(info, state, a, cache)
for idx, v in info.validators:
if v.flags.contains RewardFlags.isSlashed:
continue
let validator_balance = state.validators[idx].effective_balance
if v.flags.contains RewardFlags.isCurrentEpochAttester:
info.balances.current_epoch_attesters_raw += validator_balance
if v.flags.contains RewardFlags.isCurrentEpochTargetAttester:
info.balances.current_epoch_target_attesters_raw += validator_balance
if v.is_previous_epoch_attester.isSome():
info.balances.previous_epoch_attesters_raw += validator_balance
if v.flags.contains RewardFlags.isPreviousEpochTargetAttester:
info.balances.previous_epoch_target_attesters_raw += validator_balance
if v.flags.contains RewardFlags.isPreviousEpochHeadAttester:
info.balances.previous_epoch_head_attesters_raw += validator_balance
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#helpers
# get_eligible_validator_indices
func is_eligible_validator*(validator: RewardStatus): bool =
validator.flags.contains(RewardFlags.isActiveInPreviousEpoch) or
(validator.flags.contains(RewardFlags.isSlashed) and not
(validator.flags.contains RewardFlags.canWithdrawInCurrentEpoch))
func is_eligible_validator*(validator: Validator, previous_epoch: Epoch): bool =
is_active_validator(validator, previous_epoch) or
(validator.slashed and previous_epoch + 1 < validator.withdrawable_epoch)
func is_eligible_validator*(validator: ParticipationInfo): bool =
validator.flags.contains(ParticipationFlag.eligible)
# Spec
# --------------------------------------------------------
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#get_unslashed_participating_indices
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#get_total_balance
func get_unslashed_participating_balances*(
state: altair.BeaconState | bellatrix.BeaconState
): UnslashedParticipatingBalances =
let
previous_epoch = get_previous_epoch(state)
current_epoch = get_current_epoch(state)
var res: UnslashedParticipatingBalances
for validator_index in 0'u64 ..< state.validators.lenu64:
let
is_active_current_epoch = is_active_validator(
state.validators[validator_index], current_epoch)
validator_effective_balance =
state.validators[validator_index].effective_balance
if is_active_current_epoch:
# Active balance counted also for slashed validators
res.current_epoch += validator_effective_balance
if state.validators[validator_index].slashed:
continue
let
is_active_previous_epoch = is_active_validator(
state.validators[validator_index], previous_epoch)
previous_epoch_participation =
state.previous_epoch_participation[validator_index]
if is_active_previous_epoch:
for flag_index in 0 ..< PARTICIPATION_FLAG_WEIGHTS.len:
if has_flag(previous_epoch_participation, flag_index):
res.previous_epoch[flag_index] += validator_effective_balance
# Only TIMELY_TARGET_FLAG_INDEX is used with the current epoch in Altair
# and merge
if is_active_current_epoch and has_flag(
state.current_epoch_participation[validator_index],
TIMELY_TARGET_FLAG_INDEX):
res.current_epoch_TIMELY_TARGET += validator_effective_balance
for flag_index in 0 ..< PARTICIPATION_FLAG_WEIGHTS.len:
res.previous_epoch[flag_index] =
max(EFFECTIVE_BALANCE_INCREMENT, res.previous_epoch[flag_index])
res.current_epoch_TIMELY_TARGET =
max(EFFECTIVE_BALANCE_INCREMENT, res.current_epoch_TIMELY_TARGET)
res.current_epoch = max(EFFECTIVE_BALANCE_INCREMENT, res.current_epoch)
res
func is_unslashed_participating_index(
state: altair.BeaconState | bellatrix.BeaconState, flag_index: int, epoch: Epoch,
validator_index: ValidatorIndex): bool =
doAssert epoch in [get_previous_epoch(state), get_current_epoch(state)]
# TODO hoist this conditional
let epoch_participation =
if epoch == get_current_epoch(state):
unsafeAddr state.current_epoch_participation
else:
unsafeAddr state.previous_epoch_participation
is_active_validator(state.validators[validator_index], epoch) and
has_flag(epoch_participation[].item(validator_index), flag_index) and
not state.validators[validator_index].slashed
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#justification-and-finalization
type FinalityState = object
slot: Slot
current_epoch_ancestor_root: Eth2Digest
previous_epoch_ancestor_root: Eth2Digest
justification_bits: JustificationBits
previous_justified_checkpoint: Checkpoint
current_justified_checkpoint: Checkpoint
finalized_checkpoint: Checkpoint
func toFinalityState(state: ForkyBeaconState): FinalityState =
let
current_epoch = get_current_epoch(state)
previous_epoch = get_previous_epoch(state)
FinalityState(
slot: state.slot,
current_epoch_ancestor_root:
if state.slot > current_epoch.start_slot:
get_block_root(state, current_epoch)
else:
ZERO_HASH,
previous_epoch_ancestor_root:
if state.slot > previous_epoch.start_slot:
get_block_root(state, previous_epoch)
else:
ZERO_HASH,
justification_bits:
state.justification_bits,
previous_justified_checkpoint:
state.previous_justified_checkpoint,
current_justified_checkpoint:
state.current_justified_checkpoint,
finalized_checkpoint:
state.finalized_checkpoint)
func get_current_epoch(state: FinalityState): Epoch =
state.slot.epoch
func get_previous_epoch(state: FinalityState): Epoch =
get_previous_epoch(get_current_epoch(state))
func get_block_root(state: FinalityState, epoch: Epoch): Eth2Digest =
doAssert state.slot > epoch.start_slot
if epoch == get_current_epoch(state):
state.current_epoch_ancestor_root
else:
doAssert epoch == get_previous_epoch(state)
state.previous_epoch_ancestor_root
proc weigh_justification_and_finalization(
state: var (ForkyBeaconState | FinalityState),
total_active_balance: Gwei,
previous_epoch_target_balance: Gwei,
current_epoch_target_balance: Gwei,
flags: UpdateFlags = {}) =
let
previous_epoch = get_previous_epoch(state)
current_epoch = get_current_epoch(state)
old_previous_justified_checkpoint = state.previous_justified_checkpoint
old_current_justified_checkpoint = state.current_justified_checkpoint
# Process justifications
state.previous_justified_checkpoint = state.current_justified_checkpoint
## Spec:
## state.justification_bits[1:] = state.justification_bits[:-1]
## state.justification_bits[0] = 0b0
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#misc
const JUSTIFICATION_BITS_LENGTH = 4
state.justification_bits = JustificationBits(
(uint8(state.justification_bits) shl 1) and
uint8((2^JUSTIFICATION_BITS_LENGTH) - 1))
if previous_epoch_target_balance * 3 >= total_active_balance * 2:
state.current_justified_checkpoint =
Checkpoint(epoch: previous_epoch,
root: get_block_root(state, previous_epoch))
uint8(state.justification_bits).setBit 1
trace "Justified with previous epoch",
current_epoch = current_epoch,
checkpoint = shortLog(state.current_justified_checkpoint)
elif verifyFinalization in flags:
warn "Low attestation participation in previous epoch",
total_active_balance,
previous_epoch_target_balance,
current_epoch_target_balance,
epoch = get_current_epoch(state)
if current_epoch_target_balance * 3 >= total_active_balance * 2:
state.current_justified_checkpoint =
Checkpoint(epoch: current_epoch,
root: get_block_root(state, current_epoch))
uint8(state.justification_bits).setBit 0
trace "Justified with current epoch",
current_epoch = current_epoch,
checkpoint = shortLog(state.current_justified_checkpoint)
# Process finalizations
let bitfield = uint8(state.justification_bits)
## The 2nd/3rd/4th most recent epochs are justified, the 2nd using the 4th
## as source
if (bitfield and 0b1110) == 0b1110 and
old_previous_justified_checkpoint.epoch + 3 == current_epoch:
state.finalized_checkpoint = old_previous_justified_checkpoint
trace "Finalized with rule 234",
current_epoch = current_epoch,
checkpoint = shortLog(state.finalized_checkpoint)
## The 2nd/3rd most recent epochs are justified, the 2nd using the 3rd as
## source
if (bitfield and 0b110) == 0b110 and
old_previous_justified_checkpoint.epoch + 2 == current_epoch:
state.finalized_checkpoint = old_previous_justified_checkpoint
trace "Finalized with rule 23",
current_epoch = current_epoch,
checkpoint = shortLog(state.finalized_checkpoint)
## The 1st/2nd/3rd most recent epochs are justified, the 1st using the 3rd as
## source
if (bitfield and 0b111) == 0b111 and
old_current_justified_checkpoint.epoch + 2 == current_epoch:
state.finalized_checkpoint = old_current_justified_checkpoint
trace "Finalized with rule 123",
current_epoch = current_epoch,
checkpoint = shortLog(state.finalized_checkpoint)
## The 1st/2nd most recent epochs are justified, the 1st using the 2nd as
## source
if (bitfield and 0b11) == 0b11 and
old_current_justified_checkpoint.epoch + 1 == current_epoch:
state.finalized_checkpoint = old_current_justified_checkpoint
trace "Finalized with rule 12",
current_epoch = current_epoch,
checkpoint = shortLog(state.finalized_checkpoint)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#justification-and-finalization
proc process_justification_and_finalization*(
state: var phase0.BeaconState,
balances: TotalBalances, flags: UpdateFlags = {}) =
# Initial FFG checkpoint values have a `0x00` stub for `root`.
# Skip FFG updates in the first two epochs to avoid corner cases that might
# result in modifying this stub.
if get_current_epoch(state) <= GENESIS_EPOCH + 1:
return
weigh_justification_and_finalization(
state, balances.current_epoch,
balances.previous_epoch_target_attesters,
balances.current_epoch_target_attesters, flags)
proc compute_unrealized_finality*(
state: phase0.BeaconState, cache: var StateCache): FinalityCheckpoints =
if get_current_epoch(state) <= GENESIS_EPOCH + 1:
return FinalityCheckpoints(
justified: state.current_justified_checkpoint,
finalized: state.finalized_checkpoint)
var info: phase0.EpochInfo
info.init(state)
info.process_attestations(state, cache)
template balances(): auto = info.balances
var finalityState = state.toFinalityState()
weigh_justification_and_finalization(
finalityState, balances.current_epoch,
balances.previous_epoch_target_attesters,
balances.current_epoch_target_attesters)
FinalityCheckpoints(
justified: finalityState.current_justified_checkpoint,
finalized: finalityState.finalized_checkpoint)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#justification-and-finalization
proc process_justification_and_finalization*(
state: var (altair.BeaconState | bellatrix.BeaconState),
balances: UnslashedParticipatingBalances,
flags: UpdateFlags = {}) =
# Initial FFG checkpoint values have a `0x00` stub for `root`.
# Skip FFG updates in the first two epochs to avoid corner cases that might
# result in modifying this stub.
if get_current_epoch(state) <= GENESIS_EPOCH + 1:
return
# These ultimately differ from phase0 only in these lines, with the phase 0
# version effectively embedding weigh_justification_and_finalization(), for
# historical reasons.
# https://github.com/ethereum/consensus-specs/blob/v1.1.0-beta.2/specs/phase0/beacon-chain.md#justification-and-finalization
weigh_justification_and_finalization(
state, balances.current_epoch,
balances.previous_epoch[TIMELY_TARGET_FLAG_INDEX],
balances.current_epoch_TIMELY_TARGET, flags)
proc compute_unrealized_finality*(
state: altair.BeaconState | bellatrix.BeaconState): FinalityCheckpoints =
if get_current_epoch(state) <= GENESIS_EPOCH + 1:
return FinalityCheckpoints(
justified: state.current_justified_checkpoint,
finalized: state.finalized_checkpoint)
let balances = get_unslashed_participating_balances(state)
var finalityState = state.toFinalityState()
weigh_justification_and_finalization(
finalityState, balances.current_epoch,
balances.previous_epoch[TIMELY_TARGET_FLAG_INDEX],
balances.current_epoch_TIMELY_TARGET)
FinalityCheckpoints(
justified: finalityState.current_justified_checkpoint,
finalized: finalityState.finalized_checkpoint)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#helpers
func get_base_reward_sqrt*(state: phase0.BeaconState, index: ValidatorIndex,
total_balance_sqrt: auto): Gwei =
# Spec function recalculates total_balance every time, which creates an
# O(n^2) situation.
let effective_balance = state.validators[index].effective_balance
effective_balance * BASE_REWARD_FACTOR div
total_balance_sqrt div BASE_REWARDS_PER_EPOCH
func get_proposer_reward*(base_reward: Gwei): Gwei =
# Spec version recalculates get_total_active_balance(state) quadratically
base_reward div PROPOSER_REWARD_QUOTIENT
func is_in_inactivity_leak(finality_delay: uint64): bool =
finality_delay > MIN_EPOCHS_TO_INACTIVITY_PENALTY
func get_finality_delay*(state: ForkyBeaconState): uint64 =
get_previous_epoch(state) - state.finalized_checkpoint.epoch
func get_attestation_component_reward*(attesting_balance: Gwei,
total_balance: Gwei,
base_reward: uint64,
finality_delay: uint64): Gwei =
if is_in_inactivity_leak(finality_delay):
# Since full base reward will be canceled out by inactivity penalty deltas,
# optimal participation receives full base reward compensation here.
base_reward
else:
let reward_numerator =
base_reward * (attesting_balance div EFFECTIVE_BALANCE_INCREMENT)
reward_numerator div (total_balance div EFFECTIVE_BALANCE_INCREMENT)
func get_attestation_component_delta(is_unslashed_attester: bool,
attesting_balance: Gwei,
total_balance: Gwei,
base_reward: uint64,
finality_delay: uint64): RewardDelta =
# Helper with shared logic for use by get source, target, and head deltas
# functions
if is_unslashed_attester:
RewardDelta(rewards: get_attestation_component_reward(
attesting_balance,
total_balance,
base_reward,
finality_delay))
else:
RewardDelta(penalties: base_reward)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#components-of-attestation-deltas
func get_source_delta*(validator: RewardStatus,
base_reward: uint64,
balances: TotalBalances,
finality_delay: uint64): RewardDelta =
## Return attester micro-rewards/penalties for source-vote for each validator.
get_attestation_component_delta(
validator.is_previous_epoch_attester.isSome() and
not (validator.flags.contains RewardFlags.isSlashed),
balances.previous_epoch_attesters,
balances.current_epoch,
base_reward,
finality_delay)
func get_target_delta*(validator: RewardStatus,
base_reward: uint64,
balances: TotalBalances,
finality_delay: uint64): RewardDelta =
## Return attester micro-rewards/penalties for target-vote for each validator.
get_attestation_component_delta(
validator.flags.contains(RewardFlags.isPreviousEpochTargetAttester) and
not (validator.flags.contains(RewardFlags.isSlashed)),
balances.previous_epoch_target_attesters,
balances.current_epoch,
base_reward,
finality_delay)
func get_head_delta*(validator: RewardStatus,
base_reward: uint64,
balances: TotalBalances,
finality_delay: uint64): RewardDelta =
## Return attester micro-rewards/penalties for head-vote for each validator.
get_attestation_component_delta(
validator.flags.contains(RewardFlags.isPreviousEpochHeadAttester) and
((not validator.flags.contains(RewardFlags.isSlashed))),
balances.previous_epoch_head_attesters,
balances.current_epoch,
base_reward,
finality_delay)
func get_inclusion_delay_delta*(validator: RewardStatus,
base_reward: uint64):
(RewardDelta, Option[(uint64, RewardDelta)]) =
## Return proposer and inclusion delay micro-rewards/penalties for each validator.
if validator.is_previous_epoch_attester.isSome() and ((not validator.flags.contains(RewardFlags.isSlashed))):
let
inclusion_info = validator.is_previous_epoch_attester.get()
proposer_reward = get_proposer_reward(base_reward)
proposer_delta = RewardDelta(rewards: proposer_reward)
let
max_attester_reward = base_reward - proposer_reward
delta = RewardDelta(rewards: max_attester_reward div inclusion_info.delay)
proposer_index = inclusion_info.proposer_index;
return (delta, some((proposer_index, proposer_delta)))
func get_inactivity_penalty_delta*(validator: RewardStatus,
base_reward: Gwei,
finality_delay: uint64): RewardDelta =
## Return inactivity reward/penalty deltas for each validator.
var delta: RewardDelta
if is_in_inactivity_leak(finality_delay):
# If validator is performing optimally this cancels all rewards for a neutral balance
delta.penalties +=
BASE_REWARDS_PER_EPOCH * base_reward - get_proposer_reward(base_reward)
# Additionally, all validators whose FFG target didn't match are penalized extra
# This condition is equivalent to this condition from the spec:
# `index not in get_unslashed_attesting_indices(state, matching_target_attestations)`
if (validator.flags.contains(RewardFlags.isSlashed)) or
((not validator.flags.contains(RewardFlags.isPreviousEpochTargetAttester))):
delta.penalties +=
validator.current_epoch_effective_balance * finality_delay div
INACTIVITY_PENALTY_QUOTIENT
delta
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#get_attestation_deltas
func get_attestation_deltas(state: phase0.BeaconState, info: var phase0.EpochInfo) =
## Update rewards with attestation reward/penalty deltas for each validator.
let
finality_delay = get_finality_delay(state)
total_balance = info.balances.current_epoch
total_balance_sqrt = integer_squareroot(total_balance)
# Filter out ineligible validators. All sub-functions of the spec do this
# except for `get_inclusion_delay_deltas`. It's safe to do so here because
# any validator that is in the unslashed indices of the matching source
# attestations is active, and therefore eligible.
for index, validator in info.validators.mpairs():
if not is_eligible_validator(validator):
continue
let
base_reward = get_base_reward_sqrt(
state, index.ValidatorIndex, total_balance_sqrt)
let
source_delta = get_source_delta(
validator, base_reward, info.balances, finality_delay)
target_delta = get_target_delta(
validator, base_reward, info.balances, finality_delay)
head_delta = get_head_delta(
validator, base_reward, info.balances, finality_delay)
(inclusion_delay_delta, proposer_delta) =
get_inclusion_delay_delta(validator, base_reward)
inactivity_delta = get_inactivity_penalty_delta(
validator, base_reward, finality_delay)
validator.delta.add source_delta
validator.delta.add target_delta
validator.delta.add head_delta
validator.delta.add inclusion_delay_delta
validator.delta.add inactivity_delta
if proposer_delta.isSome:
let proposer_index = proposer_delta.get()[0]
if proposer_index < info.validators.lenu64:
info.validators[proposer_index].delta.add(
proposer_delta.get()[1])
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#get_base_reward
func get_base_reward_increment*(
state: altair.BeaconState | bellatrix.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
increments * base_reward_per_increment
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#get_flag_index_deltas
func get_flag_index_reward*(state: altair.BeaconState | bellatrix.BeaconState,
base_reward: Gwei, active_increments: Gwei,
unslashed_participating_increments: Gwei,
weight, finality_delay: uint64): Gwei =
if not is_in_inactivity_leak(finality_delay):
let reward_numerator =
base_reward * weight * unslashed_participating_increments
reward_numerator div (active_increments * WEIGHT_DENOMINATOR)
else:
0.Gwei
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#get_flag_index_deltas
func get_unslashed_participating_increment*(
info: altair.EpochInfo | bellatrix.BeaconState, flag_index: int): Gwei =
info.balances.previous_epoch[flag_index] div EFFECTIVE_BALANCE_INCREMENT
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#get_flag_index_deltas
func get_active_increments*(info: altair.EpochInfo | bellatrix.BeaconState): Gwei =
info.balances.current_epoch div EFFECTIVE_BALANCE_INCREMENT
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#get_flag_index_deltas
iterator get_flag_index_deltas*(
state: altair.BeaconState | bellatrix.BeaconState, flag_index: int,
base_reward_per_increment: Gwei,
info: var altair.EpochInfo,
finality_delay: uint64):
(ValidatorIndex, RewardDelta) =
## Return the deltas for a given ``flag_index`` by scanning through the
## participation flags.
let
previous_epoch = get_previous_epoch(state)
weight = PARTICIPATION_FLAG_WEIGHTS[flag_index].uint64 # safe
unslashed_participating_increments = get_unslashed_participating_increment(
info, flag_index)
active_increments = get_active_increments(info)
for vidx in state.validators.vindices:
if not is_eligible_validator(info.validators[vidx]):
continue
let base_reward = get_base_reward_increment(state, vidx, base_reward_per_increment)
yield
if is_unslashed_participating_index(
state, flag_index, previous_epoch, vidx):
let pflag = case flag_index
of TIMELY_SOURCE_FLAG_INDEX: ParticipationFlag.timelySourceAttester
of TIMELY_TARGET_FLAG_INDEX: ParticipationFlag.timelyTargetAttester
of TIMELY_HEAD_FLAG_INDEX: ParticipationFlag.timelyHeadAttester
else: raiseAssert "Unknown flag index " & $flag_index
info.validators[vidx].flags.incl pflag
(vidx, RewardDelta(
rewards: get_flag_index_reward(
state, base_reward, active_increments,
unslashed_participating_increments, weight, finality_delay),
penalties: 0.Gwei))
elif flag_index != TIMELY_HEAD_FLAG_INDEX:
(vidx, RewardDelta(
rewards: 0.Gwei,
penalties: base_reward * weight div WEIGHT_DENOMINATOR))
else:
(vidx, RewardDelta(rewards: 0.Gwei, penalties: 0.Gwei))
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#modified-get_inactivity_penalty_deltas
iterator get_inactivity_penalty_deltas*(
cfg: RuntimeConfig, state: altair.BeaconState, info: altair.EpochInfo):
(ValidatorIndex, Gwei) =
## Return the inactivity penalty deltas by considering timely target
## participation flags and inactivity scores.
let
penalty_denominator =
cfg.INACTIVITY_SCORE_BIAS * INACTIVITY_PENALTY_QUOTIENT_ALTAIR
previous_epoch = get_previous_epoch(state)
for vidx in state.validators.vindices:
if not is_eligible_validator(info.validators[vidx]):
continue
if not is_unslashed_participating_index(
state, TIMELY_TARGET_FLAG_INDEX, previous_epoch, vidx):
let
penalty_numerator = state.validators[vidx].effective_balance *
state.inactivity_scores[vidx]
yield (vidx, Gwei(penalty_numerator div penalty_denominator))
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#modified-get_inactivity_penalty_deltas
iterator get_inactivity_penalty_deltas*(
cfg: RuntimeConfig, state: bellatrix.BeaconState, info: altair.EpochInfo):
(ValidatorIndex, Gwei) =
## Return the inactivity penalty deltas by considering timely target
## participation flags and inactivity scores.
let
# [Modified in Bellatrix]
penalty_denominator =
cfg.INACTIVITY_SCORE_BIAS * INACTIVITY_PENALTY_QUOTIENT_BELLATRIX
previous_epoch = get_previous_epoch(state)
for vidx in state.validators.vindices:
if not is_eligible_validator(info.validators[vidx]):
continue
if not is_unslashed_participating_index(
state, TIMELY_TARGET_FLAG_INDEX, previous_epoch, vidx):
let
penalty_numerator = state.validators[vidx].effective_balance *
state.inactivity_scores[vidx]
yield (vidx, Gwei(penalty_numerator div penalty_denominator))
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#rewards-and-penalties-1
func process_rewards_and_penalties(
state: var phase0.BeaconState, info: var phase0.EpochInfo) =
# No rewards are applied at the end of `GENESIS_EPOCH` because rewards are
# for work done in the previous epoch
doAssert info.validators.len == state.validators.len
if get_current_epoch(state) == GENESIS_EPOCH:
return
get_attestation_deltas(state, info)
# Here almost all balances are updated (assuming most validators are active) -
# clearing the cache becomes a bottleneck if done item by item because of the
# recursive nature of cache clearing - instead, we clear the whole cache then
# update the raw list directly
state.balances.clearCache()
for idx, v in info.validators:
var balance = state.balances.item(idx)
increase_balance(balance, v.delta.rewards)
decrease_balance(balance, v.delta.penalties)
state.balances.asSeq()[idx] = balance
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#rewards-and-penalties
func process_rewards_and_penalties(
cfg: RuntimeConfig, state: var (altair.BeaconState | bellatrix.BeaconState),
info: var altair.EpochInfo)
=
if get_current_epoch(state) == GENESIS_EPOCH:
return
let
total_active_balance = info.balances.current_epoch
base_reward_per_increment = get_base_reward_per_increment(
total_active_balance)
finality_delay = get_finality_delay(state)
doAssert state.validators.len() == info.validators.len()
for flag_index in 0 ..< PARTICIPATION_FLAG_WEIGHTS.len:
for validator_index, delta in get_flag_index_deltas(
state, flag_index, base_reward_per_increment, info, finality_delay):
info.validators[validator_index].delta.add(delta)
for validator_index, penalty in get_inactivity_penalty_deltas(
cfg, state, info):
info.validators[validator_index].delta.penalties += penalty
# Here almost all balances are updated (assuming most validators are active) -
# clearing the cache becomes a bottleneck if done item by item because of the
# recursive nature of cache clearing - instead, we clear the whole cache then
# update the raw list directly
state.balances.clearCache()
for vidx in state.validators.vindices:
var balance = state.balances.item(vidx)
increase_balance(balance, info.validators[vidx].delta.rewards)
decrease_balance(balance, info.validators[vidx].delta.penalties)
state.balances.asSeq()[vidx] = balance
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#registry-updates
func process_registry_updates*(
cfg: RuntimeConfig, state: var ForkyBeaconState, cache: var StateCache):
Result[void, cstring] =
## Process activation eligibility and ejections
# Make visible, e.g.,
# https://github.com/status-im/nimbus-eth2/pull/608
# https://github.com/sigp/lighthouse/pull/657
let epoch {.used.} = get_current_epoch(state)
trace "process_registry_updates validator balances",
balances=state.balances,
active_validator_indices=get_active_validator_indices(state, epoch),
epoch=epoch
# is_active_validator(...) is activation_epoch <= epoch < exit_epoch,
# and changes here to either activation_epoch or exit_epoch only take
# effect with a compute_activation_exit_epoch(...) delay of, based on
# the current epoch, 1 + MAX_SEED_LOOKAHEAD epochs ahead. Thus caches
# remain valid for this epoch through though this function along with
# the rest of the epoch transition.
for vidx in state.validators.vindices:
if is_eligible_for_activation_queue(state.validators.item(vidx)):
state.validators.mitem(vidx).activation_eligibility_epoch =
get_current_epoch(state) + 1
if is_active_validator(state.validators.item(vidx), get_current_epoch(state)) and
state.validators.item(vidx).effective_balance <= cfg.EJECTION_BALANCE:
? initiate_validator_exit(cfg, state, vidx, cache)
## Queue validators eligible for activation and not dequeued for activation
var activation_queue : seq[tuple[a: Epoch, b: ValidatorIndex]] = @[]
for vidx in state.validators.vindices:
let validator = unsafeAddr state.validators.item(vidx)
if is_eligible_for_activation(state, validator[]):
activation_queue.add (
validator[].activation_eligibility_epoch, vidx)
activation_queue.sort(system.cmp)
## Dequeued validators for activation up to churn limit (without resetting
## activation epoch)
let churn_limit = get_validator_churn_limit(cfg, state, cache)
for i, epoch_and_index in activation_queue:
if i.uint64 >= churn_limit:
break
let
(_, vidx) = epoch_and_index
state.validators.mitem(vidx).activation_epoch =
compute_activation_exit_epoch(get_current_epoch(state))
ok()
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#slashings
func get_adjusted_total_slashing_balance*(
state: ForkyBeaconState, total_balance: Gwei): Gwei =
let multiplier =
# tradeoff here about interleaving phase0/altair, but for these
# single-constant changes...
when state is phase0.BeaconState:
PROPORTIONAL_SLASHING_MULTIPLIER
elif state is altair.BeaconState:
PROPORTIONAL_SLASHING_MULTIPLIER_ALTAIR
elif state is bellatrix.BeaconState:
PROPORTIONAL_SLASHING_MULTIPLIER_BELLATRIX
else:
{.fatal: "process_slashings: incorrect BeaconState type".}
min(sum(state.slashings.data) * multiplier, total_balance)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#slashings
func slashing_penalty_applies*(validator: Validator, epoch: Epoch): bool =
validator.slashed and
epoch + EPOCHS_PER_SLASHINGS_VECTOR div 2 == validator.withdrawable_epoch
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#slashings
func get_slashing_penalty*(validator: Validator,
adjusted_total_slashing_balance,
total_balance: Gwei): Gwei =
const increment = EFFECTIVE_BALANCE_INCREMENT # Factored out from penalty
# numerator to avoid uint64 overflow
let penalty_numerator = validator.effective_balance div increment *
adjusted_total_slashing_balance
penalty_numerator div total_balance * increment
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#slashings
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/bellatrix/beacon-chain.md#slashings
func process_slashings*(state: var ForkyBeaconState, total_balance: Gwei) =
let
epoch = get_current_epoch(state)
adjusted_total_slashing_balance = get_adjusted_total_slashing_balance(
state, total_balance)
for vidx in state.validators.vindices:
let validator = unsafeAddr state.validators.item(vidx)
if slashing_penalty_applies(validator[], epoch):
let penalty = get_slashing_penalty(
validator[], adjusted_total_slashing_balance, total_balance)
decrease_balance(state, vidx, penalty)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#eth1-data-votes-updates
func process_eth1_data_reset*(state: var ForkyBeaconState) =
let next_epoch = get_current_epoch(state) + 1
# Reset eth1 data votes
if next_epoch mod EPOCHS_PER_ETH1_VOTING_PERIOD == 0:
state.eth1_data_votes = default(type state.eth1_data_votes)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#effective-balances-updates
func process_effective_balance_updates*(state: var ForkyBeaconState) =
# Update effective balances with hysteresis
for vidx in state.validators.vindices:
let balance = state.balances.item(vidx)
const
HYSTERESIS_INCREMENT =
EFFECTIVE_BALANCE_INCREMENT div HYSTERESIS_QUOTIENT
DOWNWARD_THRESHOLD =
HYSTERESIS_INCREMENT * HYSTERESIS_DOWNWARD_MULTIPLIER
UPWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_UPWARD_MULTIPLIER
let effective_balance = state.validators.item(vidx).effective_balance
if balance + DOWNWARD_THRESHOLD < effective_balance or
effective_balance + UPWARD_THRESHOLD < balance:
let new_effective_balance =
min(
balance - balance mod EFFECTIVE_BALANCE_INCREMENT,
MAX_EFFECTIVE_BALANCE)
# Protect against unnecessary cache invalidation
if new_effective_balance != effective_balance:
state.validators.mitem(vidx).effective_balance = new_effective_balance
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#slashings-balances-updates
func process_slashings_reset*(state: var ForkyBeaconState) =
let next_epoch = get_current_epoch(state) + 1
# Reset slashings
state.slashings[int(next_epoch mod EPOCHS_PER_SLASHINGS_VECTOR)] = 0.Gwei
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#randao-mixes-updates
func process_randao_mixes_reset*(state: var ForkyBeaconState) =
let
current_epoch = get_current_epoch(state)
next_epoch = current_epoch + 1
# Set randao mix
state.randao_mixes[next_epoch mod EPOCHS_PER_HISTORICAL_VECTOR] =
get_randao_mix(state, current_epoch)
func compute_historical_root*(state: var ForkyBeaconState): Eth2Digest =
# Equivalent to hash_tree_root(foo: HistoricalBatch), but without using
# significant additional stack or heap.
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#historicalbatch
# In response to https://github.com/status-im/nimbus-eth2/issues/921
hash_tree_root([
hash_tree_root(state.block_roots), hash_tree_root(state.state_roots)])
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#historical-roots-updates
func process_historical_roots_update*(state: var ForkyBeaconState) =
## Set historical root accumulator
let next_epoch = get_current_epoch(state) + 1
if next_epoch mod (SLOTS_PER_HISTORICAL_ROOT div SLOTS_PER_EPOCH) == 0:
# Equivalent to hash_tree_root(foo: HistoricalBatch), but without using
# significant additional stack or heap.
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#historicalbatch
# In response to https://github.com/status-im/nimbus-eth2/issues/921
if not state.historical_roots.add state.compute_historical_root():
raiseAssert "no more room for historical roots, so long and thanks for the fish!"
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#participation-records-rotation
func process_participation_record_updates*(state: var phase0.BeaconState) =
# Rotate current/previous epoch attestations - using swap avoids copying all
# elements using a slow genericSeqAssign
state.previous_epoch_attestations.clear()
swap(state.previous_epoch_attestations, state.current_epoch_attestations)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#participation-flags-updates
func process_participation_flag_updates*(state: var (altair.BeaconState | bellatrix.BeaconState)) =
state.previous_epoch_participation = state.current_epoch_participation
const zero = 0.ParticipationFlags
for i in 0 ..< state.current_epoch_participation.len:
state.current_epoch_participation.data[i] = zero
# Shouldn't be wasted zeroing, because state.current_epoch_participation only
# grows. New elements are automatically initialized to 0, as required.
doAssert state.current_epoch_participation.data.setLen(state.validators.len)
state.current_epoch_participation.asHashList.resetCache()
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#sync-committee-updates
func process_sync_committee_updates*(
state: var (altair.BeaconState | bellatrix.BeaconState)) =
let next_epoch = get_current_epoch(state) + 1
if next_epoch.is_sync_committee_period():
state.current_sync_committee = state.next_sync_committee
state.next_sync_committee = get_next_sync_committee(state)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#inactivity-scores
func process_inactivity_updates*(
cfg: RuntimeConfig, state: var (altair.BeaconState | bellatrix.BeaconState),
info: altair.EpochInfo) =
# Score updates based on previous epoch participation, skip genesis epoch
if get_current_epoch(state) == GENESIS_EPOCH:
return
let
previous_epoch = get_previous_epoch(state) # get_eligible_validator_indices()
finality_delay = get_finality_delay(state)
not_in_inactivity_leak = not is_in_inactivity_leak(finality_delay)
for index in 0'u64 ..< state.validators.lenu64:
if not is_eligible_validator(info.validators[index]):
continue
# Increase the inactivity score of inactive validators
let pre_inactivity_score = state.inactivity_scores.asSeq()[index]
var inactivity_score = pre_inactivity_score
# TODO activeness already checked; remove redundant checks between
# is_active_validator and is_unslashed_participating_index
if is_unslashed_participating_index(
state, TIMELY_TARGET_FLAG_INDEX, previous_epoch, index.ValidatorIndex):
inactivity_score -= min(1'u64, inactivity_score)
else:
inactivity_score += cfg.INACTIVITY_SCORE_BIAS
# Decrease the inactivity score of all eligible validators during a
# leak-free epoch
if not_in_inactivity_leak:
inactivity_score -= min(INACTIVITY_SCORE_RECOVERY_RATE.uint64, inactivity_score)
# Most inactivity scores remain at 0 - avoid invalidating cache
if pre_inactivity_score != inactivity_score:
state.inactivity_scores[index] = inactivity_score
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#epoch-processing
proc process_epoch*(
cfg: RuntimeConfig, state: var phase0.BeaconState, flags: UpdateFlags,
cache: var StateCache, info: var phase0.EpochInfo): Result[void, cstring] =
let currentEpoch = get_current_epoch(state)
trace "process_epoch",
current_epoch = currentEpoch
info.init(state)
info.process_attestations(state, cache)
process_justification_and_finalization(state, info.balances, flags)
# state.slot hasn't been incremented yet.
if verifyFinalization in flags and currentEpoch >= 2:
doAssert state.current_justified_checkpoint.epoch + 2 >= currentEpoch
if verifyFinalization in flags and currentEpoch >= 3:
# Rule 2/3/4 finalization results in the most pessimal case. The other
# three finalization rules finalize more quickly as long as the any of
# the finalization rules triggered.
doAssert state.finalized_checkpoint.epoch + 3 >= currentEpoch
process_rewards_and_penalties(state, info)
? process_registry_updates(cfg, state, cache)
process_slashings(state, info.balances.current_epoch)
process_eth1_data_reset(state)
process_effective_balance_updates(state)
process_slashings_reset(state)
process_randao_mixes_reset(state)
process_historical_roots_update(state)
process_participation_record_updates(state)
ok()
func init*(
info: var altair.EpochInfo,
state: altair.BeaconState | bellatrix.BeaconState) =
# init participation, overwriting the full structure
info.balances = get_unslashed_participating_balances(state)
info.validators.setLen(state.validators.len())
let previous_epoch = get_previous_epoch(state)
for index in 0..<state.validators.len():
var flags: set[ParticipationFlag]
if is_eligible_validator(state.validators[index], previous_epoch):
flags.incl ParticipationFlag.eligible
info.validators[index] = ParticipationInfo(
flags: flags
)
func init*(
T: type altair.EpochInfo, state: altair.BeaconState | bellatrix.BeaconState): T =
init(result, state)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/altair/beacon-chain.md#epoch-processing
proc process_epoch*(
cfg: RuntimeConfig, state: var (altair.BeaconState | bellatrix.BeaconState),
flags: UpdateFlags, cache: var StateCache, info: var altair.EpochInfo):
Result[void, cstring] =
let currentEpoch = get_current_epoch(state)
trace "process_epoch",
current_epoch = currentEpoch
info.init(state)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#justification-and-finalization
process_justification_and_finalization(state, info.balances, flags)
# state.slot hasn't been incremented yet.
if verifyFinalization in flags and currentEpoch >= 2:
doAssert state.current_justified_checkpoint.epoch + 2 >= currentEpoch
if verifyFinalization in flags and currentEpoch >= 3:
# Rule 2/3/4 finalization results in the most pessimal case. The other
# three finalization rules finalize more quickly as long as the any of
# the finalization rules triggered.
doAssert state.finalized_checkpoint.epoch + 3 >= currentEpoch
process_inactivity_updates(cfg, state, info) # [New in Altair]
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#process_rewards_and_penalties
process_rewards_and_penalties(cfg, state, info)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#registry-updates
? process_registry_updates(cfg, state, cache)
# https://github.com/ethereum/consensus-specs/blob/v1.2.0-rc.1/specs/phase0/beacon-chain.md#slashings
process_slashings(state, info.balances.current_epoch)
process_eth1_data_reset(state)
process_effective_balance_updates(state)
process_slashings_reset(state)
process_randao_mixes_reset(state)
process_historical_roots_update(state)
process_participation_flag_updates(state) # [New in Altair]
process_sync_committee_updates(state) # [New in Altair]
ok()
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