# 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.3/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/v1.5.0-alpha.6/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/v1.5.0-alpha.6/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/v1.5.0-alpha.6/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.. 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.6/specs/electra/beacon-chain.md#modified-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 = 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.6/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/v1.5.0-alpha.6/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.6/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.5/specs/electra/beacon-chain.md#modified-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/v1.5.0-alpha.6/specs/altair/beacon-chain.md#modified-slash_validator # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.6/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.6/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/v1.5.0-alpha.6/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.6/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.3/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 # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/specs/electra/beacon-chain.md#updated-is_eligible_for_activation_queue func is_eligible_for_activation_queue*( fork: static ConsensusFork, validator: Validator): bool = ## Check if ``validator`` is eligible to be placed into the activation queue. when fork <= ConsensusFork.Deneb: validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH and validator.effective_balance == MAX_EFFECTIVE_BALANCE.Gwei else: # [Modified in Electra:EIP7251] validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH and validator.effective_balance >= MIN_ACTIVATION_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.3/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/v1.5.0-alpha.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/v1.5.0-alpha.6/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/v1.5.0-alpha.6/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/v1.5.0-alpha.6/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/v1.5.0-alpha.6/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/v1.5.0-alpha.6/specs/altair/beacon-chain.md#get_next_sync_committee_indices # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/specs/electra/beacon-chain.md#modified-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 const meb = when typeof(state).kind >= ConsensusFork.Electra: MAX_EFFECTIVE_BALANCE_ELECTRA.Gwei # [Modified in Electra:EIP7251] else: MAX_EFFECTIVE_BALANCE.Gwei if effective_balance * MAX_RANDOM_BYTE >= meb * random_byte: res[index] = state.validators[candidate_index].pubkey inc index i += 1'u64 res # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.6/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.3/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.3/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.6/specs/capella/beacon-chain.md#is_fully_withdrawable_validator # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/specs/electra/beacon-chain.md#updated-is_fully_withdrawable_validator func is_fully_withdrawable_validator( fork: static ConsensusFork, validator: Validator, balance: Gwei, epoch: Epoch): bool = ## Check if ``validator`` is fully withdrawable. when fork >= ConsensusFork.Electra: # [Modified in Electra:EIP7251] has_execution_withdrawal_credential(validator) and validator.withdrawable_epoch <= epoch and balance > 0.Gwei else: 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 # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/specs/electra/beacon-chain.md#updated-is_partially_withdrawable_validator func is_partially_withdrawable_validator( fork: static ConsensusFork, validator: Validator, balance: Gwei): bool = ## Check if ``validator`` is partially withdrawable. when fork >= ConsensusFork.Electra: # [Modified in Electra:EIP7251] let max_effective_balance = get_validator_max_effective_balance(validator) has_max_effective_balance = validator.effective_balance == max_effective_balance has_excess_balance = balance > max_effective_balance # [Modified in Electra:EIP7251] has_execution_withdrawal_credential(validator) and has_max_effective_balance and has_excess_balance else: let has_max_effective_balance = validator.effective_balance == static(MAX_EFFECTIVE_BALANCE.Gwei) has_excess_balance = balance > static(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#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: uint64) = 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 discard state.pending_balance_deposits.add( PendingBalanceDeposit(index: index, 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.uint64) # 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.7/specs/phase0/beacon-chain.md#effective-balances-updates template effective_balance_might_update*( balance: Gwei, effective_balance: Gwei): bool = const HYSTERESIS_INCREMENT = EFFECTIVE_BALANCE_INCREMENT.Gwei div HYSTERESIS_QUOTIENT DOWNWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_DOWNWARD_MULTIPLIER UPWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_UPWARD_MULTIPLIER balance + DOWNWARD_THRESHOLD < effective_balance or effective_balance + UPWARD_THRESHOLD < balance # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.6/specs/phase0/beacon-chain.md#effective-balances-updates # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.1/specs/electra/beacon-chain.md#updated-process_effective_balance_updates template get_effective_balance_update*( consensusFork: static ConsensusFork, balance: Gwei, effective_balance: Gwei, vidx: uint64): Gwei = when consensusFork <= ConsensusFork.Deneb: min( balance - balance mod EFFECTIVE_BALANCE_INCREMENT.Gwei, MAX_EFFECTIVE_BALANCE.Gwei) else: let effective_balance_limit = if has_compounding_withdrawal_credential(state.validators.item(vidx)): MAX_EFFECTIVE_BALANCE_ELECTRA.Gwei else: MIN_ACTIVATION_BALANCE.Gwei min( balance - balance mod EFFECTIVE_BALANCE_INCREMENT.Gwei, effective_balance_limit) template get_updated_effective_balance*( consensusFork: static ConsensusFork, balance: Gwei, effective_balance: Gwei, vidx: uint64): Gwei = if effective_balance_might_update(balance, effective_balance): get_effective_balance_update(consensusFork, balance, effective_balance, vidx) else: balance # https://github.com/ethereum/consensus-specs/blob/v1.4.0-beta.5/specs/capella/beacon-chain.md#new-get_expected_withdrawals template get_expected_withdrawals_aux*( state: capella.BeaconState | deneb.BeaconState, epoch: Epoch, fetch_balance: untyped): seq[Withdrawal] = let num_validators = lenu64(state.validators) bound = min(len(state.validators), MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP) var withdrawal_index = state.next_withdrawal_index validator_index {.inject.} = state.next_withdrawal_validator_index withdrawals: seq[Withdrawal] = @[] for _ in 0 ..< bound: let validator = state.validators[validator_index] balance = fetch_balance if is_fully_withdrawable_validator( typeof(state).kind, 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( typeof(state).kind, 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 func get_expected_withdrawals*( state: capella.BeaconState | deneb.BeaconState): seq[Withdrawal] = get_expected_withdrawals_aux(state, get_current_epoch(state)) do: state.balances[validator_index] # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/specs/electra/beacon-chain.md#updated-get_expected_withdrawals # This partials count is used in exactly one place, while in general being able # to cleanly treat the results of get_expected_withdrawals as a seq[Withdrawal] # are valuable enough to make that the default version of this spec function. template get_expected_withdrawals_with_partial_count_aux*( state: electra.BeaconState, epoch: Epoch, fetch_balance: untyped): (seq[Withdrawal], uint64) = doAssert epoch - get_current_epoch(state) in [0'u64, 1'u64] var withdrawal_index = state.next_withdrawal_index withdrawals: seq[Withdrawal] = @[] # [New in Electra:EIP7251] Consume pending partial withdrawals for withdrawal in state.pending_partial_withdrawals: if withdrawal.withdrawable_epoch > epoch or len(withdrawals) == MAX_PENDING_PARTIALS_PER_WITHDRAWALS_SWEEP: break let validator = state.validators.item(withdrawal.index) # Keep a uniform variable name available for injected code validator_index {.inject.} = withdrawal.index # Here, can't use the pre-stored effective balance because this template # might be called on the next slot and therefore next epoch, after which # the effective balance might have updated. effective_balance_at_slot = if epoch == get_current_epoch(state): validator.effective_balance else: get_updated_effective_balance( typeof(state).kind, fetch_balance, validator.effective_balance, validator_index) has_sufficient_effective_balance = effective_balance_at_slot >= static(MIN_ACTIVATION_BALANCE.Gwei) has_excess_balance = fetch_balance > static(MIN_ACTIVATION_BALANCE.Gwei) if validator.exit_epoch == FAR_FUTURE_EPOCH and has_sufficient_effective_balance and has_excess_balance: let withdrawable_balance = min( fetch_balance - static(MIN_ACTIVATION_BALANCE.Gwei), withdrawal.amount) var w = Withdrawal( index: withdrawal_index, validator_index: withdrawal.index, amount: withdrawable_balance) w.address.data[0..19] = validator.withdrawal_credentials.data[12..^1] withdrawals.add w withdrawal_index += 1 let partial_withdrawals_count = lenu64(withdrawals) let bound = min(len(state.validators), MAX_VALIDATORS_PER_WITHDRAWALS_SWEEP) num_validators = lenu64(state.validators) var validator_index {.inject.} = state.next_withdrawal_validator_index # Sweep for remaining. for _ in 0 ..< bound: let validator = state.validators.item(validator_index) balance = fetch_balance if is_fully_withdrawable_validator( typeof(state).kind, 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( typeof(state).kind, validator, balance): var w = Withdrawal( index: withdrawal_index, validator_index: validator_index, # [Modified in Electra:EIP7251] amount: balance - get_validator_max_effective_balance(validator)) 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, partial_withdrawals_count) template get_expected_withdrawals_with_partial_count*( state: electra.BeaconState): (seq[Withdrawal], uint64) = get_expected_withdrawals_with_partial_count_aux( state, get_current_epoch(state)) do: state.balances.item(validator_index) func get_expected_withdrawals*(state: electra.BeaconState): seq[Withdrawal] = get_expected_withdrawals_with_partial_count(state)[0] # 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.6/specs/bellatrix/beacon-chain.md#testing # https://github.com/ethereum/consensus-specs/blob/v1.5.0-alpha.3/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 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/v1.5.0-alpha.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.5/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 ) 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_requests_start_index: UNSET_DEPOSIT_REQUESTS_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): queue_excess_active_balance(post[], index.uint64) 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.. 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)