2018-07-23 12:58:41 +00:00
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# beacon_chain
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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2018-11-28 19:49:03 +00:00
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# Uncategorized helper functions from the spec
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import ./datatypes, ./digest, sequtils, math
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2018-07-23 12:58:41 +00:00
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#integer_squareroot
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2018-12-19 04:36:10 +00:00
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func integer_squareroot*(n: SomeInteger): SomeInteger =
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2019-07-01 07:53:42 +00:00
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# Return the largest integer ``x`` such that ``x**2 <= n``.
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2019-03-16 19:52:37 +00:00
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doAssert n >= 0'u64
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2018-12-03 21:41:24 +00:00
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var
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x = n
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y = (x + 1) div 2
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while y < x:
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x = y
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y = (x + n div x) div 2
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x
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2019-04-05 14:18:13 +00:00
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# TODO reuse as necessary/useful for merkle proof building
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2018-12-13 16:00:55 +00:00
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func merkle_root*(values: openArray[Eth2Digest]): Eth2Digest =
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2019-02-07 19:27:13 +00:00
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## Merkleize ``values`` (where ``len(values)`` is a power of two) and return
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## the Merkle root.
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2019-02-22 09:56:45 +00:00
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## https://crypto.stackexchange.com/questions/43430/what-is-the-reason-to-separate-domains-in-the-internal-hash-algorithm-of-a-merkl
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2019-02-20 20:35:27 +00:00
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let num_values = len(values)
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# Simplifies boundary conditions
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2019-02-22 09:56:45 +00:00
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doAssert is_power_of_two(num_values)
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doAssert num_values >= 2
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doAssert num_values mod 2 == 0
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2019-02-20 20:35:27 +00:00
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# TODO reverse ``o`` order and use newSeqWith to avoid pointless zero-filling.
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var o = repeat(ZERO_HASH, len(values))
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var hash_buffer: array[2*32, byte]
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# These ``o`` indices get filled from ``values``.
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let highest_internally_filled_index = (num_values div 2) - 1
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2019-03-13 23:04:43 +00:00
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doAssert (highest_internally_filled_index + 1) * 2 >= num_values
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2019-02-20 20:35:27 +00:00
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for i in countdown(num_values-1, highest_internally_filled_index + 1):
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hash_buffer[0..31] = values[i*2 - num_values].data
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hash_buffer[32..63] = values[i*2+1 - num_values].data
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o[i] = eth2hash(hash_buffer)
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## These ``o`` indices get filled from other ``o`` indices.
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2019-03-13 23:04:43 +00:00
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doAssert highest_internally_filled_index * 2 + 1 < num_values
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2019-02-20 20:35:27 +00:00
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for i in countdown(highest_internally_filled_index, 1):
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hash_buffer[0..31] = o[i*2].data
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hash_buffer[32..63] = o[i*2+1].data
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o[i] = eth2hash(hash_buffer)
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o[1]
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2018-12-19 04:36:10 +00:00
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#compute_epoch_of_slot
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2019-07-01 07:53:42 +00:00
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func compute_epoch_of_slot*(slot: Slot|uint64): Epoch =
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0.6.2 updates (#275)
* update process_justification_and_finalization to 0.6.2; mark AttesterSlashing as 0.6.2
* replace get_effective_balance(...) with state.validator_registry[idx].effective_balance; rm get_effective_balance, process_ejections, should_update_validator_registry, update_validator_registry, and update_registry_and_shuffling_data; update get_total_balance to 0.6.2; implement process_registry_updates
* rm exit_validator; implement is_slashable_attestation_data; partly update processAttesterSlashings
* mark HistoricalBatch and Eth1Data as 0.6.2; implement get_shard_delta(...); replace 0.5 finish_epoch_update with 0.6 process_final_updates
* mark increase_balance, decrease_balance, get_delayed_activation_exit_epoch, bls_aggregate_pubkeys, bls_verify_multiple, Attestation, Transfer, slot_to_epoch, Crosslink, get_current_epoch, int_to_bytes*, various constants, processEth1Data, processTransfers, and verifyStateRoot as 0.6.2; rm is_double_vote and is_surround_vote
* mark get_bitfield_bit, verify_bitfield, ProposerSlashing, DepositData, VoluntaryExit, PendingAttestation, Fork, integer_squareroot, get_epoch_start_slot, is_active_validator, generate_seed, some constants to 0.6.2; rename MIN_PENALTY_QUOTIENT to MIN_SLASHING_PENALTY_QUOTIENT
* rm get_previous_total_balance, get_current_epoch_boundary_attestations, get_previous_epoch_boundary_attestations, and get_previous_epoch_matching_head_attestations
* update BeaconState to 0.6.2; simplify legacy get_crosslink_committees_at_slot infrastructure a bit by noting that registry_change is always false; reimplment 0.5 get_crosslink_committees_at_slot in terms of 0.6 get_crosslink_committee
* mark process_deposit(...), get_block_root_at_slot(...), get_block_root(...), Deposit, BeaconBlockHeader, BeaconBlockBody, hash(...), get_active_index_root(...), various constants, get_shard_delta(...), get_epoch_start_shard(...), get_crosslink_committee(...), processRandao(...), processVoluntaryExits(...), cacheState(...) as 0.6.2
* rm removed-since-0.5 split(...), is_power_of_2(...), get_shuffling(...); rm 0.5 versions of get_active_validator_indices and get_epoch_committee_count; add a few tests for integer_squareroot
* mark bytes_to_int(...) and advanceState(...) as 0.6.2
* rm 0.5 get_attesting_indices; update get_attesting_balance to 0.6.2
* another tiny commit to poke AppVeyor to maybe not timeout at connecting to GitHub partway through CI: mark get_churn_limit(...), initiate_validator_exit(...), and Validator as 0.6.2
* mark get_attestation_slot(...), AttestationDataAndCustodyBit, and BeaconBlock as 0.6.2
2019-06-03 10:31:04 +00:00
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# Return the epoch number of the given ``slot``.
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2019-03-12 22:21:32 +00:00
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(slot div SLOTS_PER_EPOCH).Epoch
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2019-01-29 03:22:22 +00:00
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#compute_start_slot_of_epoch
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2019-07-01 07:53:42 +00:00
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func compute_start_slot_of_epoch*(epoch: Epoch): Slot =
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More 0.8.0 updates (#311)
* replace BeaconState.finalized_{epoch,root} with BeaconState.finalized_checkpoint; rename get_delayed_activation_exit_epoch(...) to compute_activation_exit_epoch(...) and mark as 0.8.0; update get_churn_limit(...)/get_validator_churn_limit(...) to 0.8.0; update process_registry_updates(...) to 0.8.0
* update process_crosslinks(...) to 0.8.0; mark compute_start_slot_of_epoch(...) and get_committee_count(...) as 0.8.0
* mark Fork, is_slashable_validator(...), and get_beacon_proposer_index(...) as 0.8.0
* rename LATEST_SLASHED_EXIT_LENGTH to EPOCHS_PER_SLASHINGS_VECTOR; update process_slashings(...) to 0.8.0; remove pointless type conversion warning in get_previous_epoch(...)
* convert remaining references to finalized_epoch to finalized_checkpoint.epoch
* update slash_validator(...) to 0.8.0; mark inital value, Gwei, and time constants as 0.8.0; mark hash(...) and processBlockHeader(...) as 0.8.0
* rename WHISTLEBLOWING_REWARD_QUOTIENT to WHISTLEBLOWER_REWARD_QUOTIENT; rename LATEST_ACTIVE_INDEX_ROOTS_LENGTH to EPOCHS_PER_HISTORICAL_VECTOR (randao will also get merged into this); remove get_active_index_root(...); mark time parameter, signature domain types, and max operations per block constants as 0.8.0; update rewards and penalties constants to 0.8.0
* update is_valid_indexed_attestation(...) to 0.8.0; mark process_slot(...) as 0.8.0
* replace BeaconState.{current,previous}_justified_{epoch,root} with BeaconState.{current,previous}_justified_checkpoint
2019-07-05 08:30:05 +00:00
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# Return the start slot of ``epoch``.
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2019-03-12 22:21:32 +00:00
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(epoch * SLOTS_PER_EPOCH).Slot
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2019-02-15 16:33:32 +00:00
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#is_active_validator
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2019-02-20 01:33:58 +00:00
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func is_active_validator*(validator: Validator, epoch: Epoch): bool =
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2019-03-12 09:59:43 +00:00
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### Check if ``validator`` is active
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2019-01-29 03:22:22 +00:00
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validator.activation_epoch <= epoch and epoch < validator.exit_epoch
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2019-01-16 11:07:41 +00:00
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2019-06-18 15:34:30 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.7.1/specs/core/0_beacon-chain.md#get_active_validator_indices
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#get_active_validator_indices
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2019-05-09 12:27:37 +00:00
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func get_active_validator_indices*(state: BeaconState, epoch: Epoch):
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seq[ValidatorIndex] =
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2019-08-26 07:57:09 +00:00
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# Return the sequence of active validator indices at ``epoch``.
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2019-07-01 09:13:14 +00:00
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for idx, val in state.validators:
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2019-05-09 12:27:37 +00:00
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if is_active_validator(val, epoch):
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result.add idx.ValidatorIndex
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#get_committee_count
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2019-07-02 14:31:48 +00:00
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func get_committee_count*(state: BeaconState, epoch: Epoch): uint64 =
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2019-05-09 12:27:37 +00:00
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# Return the number of committees at ``epoch``.
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let active_validator_indices = get_active_validator_indices(state, epoch)
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More 0.8.0 updates (#311)
* replace BeaconState.finalized_{epoch,root} with BeaconState.finalized_checkpoint; rename get_delayed_activation_exit_epoch(...) to compute_activation_exit_epoch(...) and mark as 0.8.0; update get_churn_limit(...)/get_validator_churn_limit(...) to 0.8.0; update process_registry_updates(...) to 0.8.0
* update process_crosslinks(...) to 0.8.0; mark compute_start_slot_of_epoch(...) and get_committee_count(...) as 0.8.0
* mark Fork, is_slashable_validator(...), and get_beacon_proposer_index(...) as 0.8.0
* rename LATEST_SLASHED_EXIT_LENGTH to EPOCHS_PER_SLASHINGS_VECTOR; update process_slashings(...) to 0.8.0; remove pointless type conversion warning in get_previous_epoch(...)
* convert remaining references to finalized_epoch to finalized_checkpoint.epoch
* update slash_validator(...) to 0.8.0; mark inital value, Gwei, and time constants as 0.8.0; mark hash(...) and processBlockHeader(...) as 0.8.0
* rename WHISTLEBLOWING_REWARD_QUOTIENT to WHISTLEBLOWER_REWARD_QUOTIENT; rename LATEST_ACTIVE_INDEX_ROOTS_LENGTH to EPOCHS_PER_HISTORICAL_VECTOR (randao will also get merged into this); remove get_active_index_root(...); mark time parameter, signature domain types, and max operations per block constants as 0.8.0; update rewards and penalties constants to 0.8.0
* update is_valid_indexed_attestation(...) to 0.8.0; mark process_slot(...) as 0.8.0
* replace BeaconState.{current,previous}_justified_{epoch,root} with BeaconState.{current,previous}_justified_checkpoint
2019-07-05 08:30:05 +00:00
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let committees_per_slot = clamp(
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2019-05-09 12:27:37 +00:00
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len(active_validator_indices) div SLOTS_PER_EPOCH div TARGET_COMMITTEE_SIZE,
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More 0.8.0 updates (#311)
* replace BeaconState.finalized_{epoch,root} with BeaconState.finalized_checkpoint; rename get_delayed_activation_exit_epoch(...) to compute_activation_exit_epoch(...) and mark as 0.8.0; update get_churn_limit(...)/get_validator_churn_limit(...) to 0.8.0; update process_registry_updates(...) to 0.8.0
* update process_crosslinks(...) to 0.8.0; mark compute_start_slot_of_epoch(...) and get_committee_count(...) as 0.8.0
* mark Fork, is_slashable_validator(...), and get_beacon_proposer_index(...) as 0.8.0
* rename LATEST_SLASHED_EXIT_LENGTH to EPOCHS_PER_SLASHINGS_VECTOR; update process_slashings(...) to 0.8.0; remove pointless type conversion warning in get_previous_epoch(...)
* convert remaining references to finalized_epoch to finalized_checkpoint.epoch
* update slash_validator(...) to 0.8.0; mark inital value, Gwei, and time constants as 0.8.0; mark hash(...) and processBlockHeader(...) as 0.8.0
* rename WHISTLEBLOWING_REWARD_QUOTIENT to WHISTLEBLOWER_REWARD_QUOTIENT; rename LATEST_ACTIVE_INDEX_ROOTS_LENGTH to EPOCHS_PER_HISTORICAL_VECTOR (randao will also get merged into this); remove get_active_index_root(...); mark time parameter, signature domain types, and max operations per block constants as 0.8.0; update rewards and penalties constants to 0.8.0
* update is_valid_indexed_attestation(...) to 0.8.0; mark process_slot(...) as 0.8.0
* replace BeaconState.{current,previous}_justified_{epoch,root} with BeaconState.{current,previous}_justified_checkpoint
2019-07-05 08:30:05 +00:00
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1, SHARD_COUNT div SLOTS_PER_EPOCH).uint64
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2019-07-13 15:58:01 +00:00
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result = committees_per_slot * SLOTS_PER_EPOCH
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# Otherwise, get_crosslink_committee(...) cannot access some committees.
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doAssert SHARD_COUNT >= result
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2019-01-29 03:22:22 +00:00
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#get_current_epoch
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2019-02-20 01:33:58 +00:00
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func get_current_epoch*(state: BeaconState): Epoch =
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2019-07-01 07:53:42 +00:00
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# Return the current epoch.
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2019-03-09 04:23:14 +00:00
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doAssert state.slot >= GENESIS_SLOT, $state.slot
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2019-07-01 07:53:42 +00:00
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compute_epoch_of_slot(state.slot)
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2019-01-29 03:22:22 +00:00
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2019-06-18 15:34:30 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.7.1/specs/core/0_beacon-chain.md#get_randao_mix
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2019-01-29 03:22:22 +00:00
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func get_randao_mix*(state: BeaconState,
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2019-02-20 01:33:58 +00:00
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epoch: Epoch): Eth2Digest =
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2019-01-29 03:22:22 +00:00
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## Returns the randao mix at a recent ``epoch``.
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2019-06-12 07:48:49 +00:00
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## ``epoch`` expected to be between (current_epoch -
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## LATEST_RANDAO_MIXES_LENGTH, current_epoch].
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2019-07-01 09:42:37 +00:00
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state.randao_mixes[epoch mod LATEST_RANDAO_MIXES_LENGTH]
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2019-01-29 03:22:22 +00:00
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2019-03-18 15:42:42 +00:00
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func bytes_to_int*(data: openarray[byte]): uint64 =
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2019-03-13 23:04:43 +00:00
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doAssert data.len == 8
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2019-02-13 10:26:32 +00:00
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# Little-endian data representation
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result = 0
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for i in countdown(7, 0):
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result = result * 256 + data[i]
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2019-03-18 15:42:42 +00:00
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# Have 1, 4, 8, and 32-byte versions. 1+ more and maybe worth metaprogramming.
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2019-03-13 21:23:01 +00:00
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func int_to_bytes32*(x: uint64): array[32, byte] =
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2019-03-13 01:46:44 +00:00
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## Little-endian data representation
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## TODO remove uint64 when those callers fade away
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2019-02-13 10:26:32 +00:00
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for i in 0 ..< 8:
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2019-03-13 21:23:01 +00:00
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result[24 + i] = byte((x shr i*8) and 0xff)
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func int_to_bytes32*(x: Epoch): array[32, byte] {.borrow.}
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2019-02-13 10:26:32 +00:00
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2019-03-18 15:42:42 +00:00
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func int_to_bytes8*(x: uint64): array[8, byte] =
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for i in 0 ..< 8:
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result[i] = byte((x shr i*8) and 0xff)
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2019-02-13 10:26:32 +00:00
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func int_to_bytes1*(x: int): array[1, byte] =
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2019-03-13 23:04:43 +00:00
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doAssert x >= 0
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doAssert x < 256
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2019-02-13 10:26:32 +00:00
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result[0] = x.byte
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func int_to_bytes4*(x: uint64): array[4, byte] =
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2019-03-13 23:04:43 +00:00
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doAssert x >= 0'u64
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doAssert x < 2'u64^32
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2019-02-13 10:26:32 +00:00
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# Little-endian data representation
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result[0] = ((x shr 0) and 0xff).byte
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result[1] = ((x shr 8) and 0xff).byte
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result[2] = ((x shr 16) and 0xff).byte
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result[3] = ((x shr 24) and 0xff).byte
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#compute_domain
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2019-09-01 15:02:49 +00:00
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func compute_domain*(
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domain_type: DomainType,
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fork_version: array[4, byte] = [0'u8, 0, 0, 0]): uint64 =
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2019-06-14 16:21:04 +00:00
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var buf: array[8, byte]
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2019-08-26 07:57:09 +00:00
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buf[0..3] = int_to_bytes4(domain_type.uint64)
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buf[4..7] = fork_version
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2019-06-14 16:21:04 +00:00
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bytes_to_int(buf)
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#get_domain
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2019-03-18 15:42:42 +00:00
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func get_domain*(
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2019-07-01 07:53:42 +00:00
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state: BeaconState, domain_type: DomainType, message_epoch: Epoch): Domain =
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2019-04-29 16:48:30 +00:00
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## Return the signature domain (fork version concatenated with domain type)
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## of a message.
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let
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epoch = message_epoch
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fork_version = if epoch < state.fork.epoch:
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state.fork.previous_version
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else:
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state.fork.current_version
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2019-07-01 07:53:42 +00:00
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compute_domain(domain_type, fork_version)
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2019-03-18 15:42:42 +00:00
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2019-07-01 07:53:42 +00:00
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func get_domain*(state: BeaconState, domain_type: DomainType): Domain =
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2019-04-29 16:48:30 +00:00
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get_domain(state, domain_type, get_current_epoch(state))
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2019-08-26 09:09:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.8.3/specs/core/0_beacon-chain.md#get_seed
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2019-07-02 14:31:48 +00:00
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func get_seed*(state: BeaconState, epoch: Epoch): Eth2Digest =
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2019-01-29 03:22:22 +00:00
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# Generate a seed for the given ``epoch``.
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2019-02-13 10:26:32 +00:00
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var seed_input : array[32*3, byte]
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2019-04-05 14:18:13 +00:00
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0.6.2 updates (#275)
* update process_justification_and_finalization to 0.6.2; mark AttesterSlashing as 0.6.2
* replace get_effective_balance(...) with state.validator_registry[idx].effective_balance; rm get_effective_balance, process_ejections, should_update_validator_registry, update_validator_registry, and update_registry_and_shuffling_data; update get_total_balance to 0.6.2; implement process_registry_updates
* rm exit_validator; implement is_slashable_attestation_data; partly update processAttesterSlashings
* mark HistoricalBatch and Eth1Data as 0.6.2; implement get_shard_delta(...); replace 0.5 finish_epoch_update with 0.6 process_final_updates
* mark increase_balance, decrease_balance, get_delayed_activation_exit_epoch, bls_aggregate_pubkeys, bls_verify_multiple, Attestation, Transfer, slot_to_epoch, Crosslink, get_current_epoch, int_to_bytes*, various constants, processEth1Data, processTransfers, and verifyStateRoot as 0.6.2; rm is_double_vote and is_surround_vote
* mark get_bitfield_bit, verify_bitfield, ProposerSlashing, DepositData, VoluntaryExit, PendingAttestation, Fork, integer_squareroot, get_epoch_start_slot, is_active_validator, generate_seed, some constants to 0.6.2; rename MIN_PENALTY_QUOTIENT to MIN_SLASHING_PENALTY_QUOTIENT
* rm get_previous_total_balance, get_current_epoch_boundary_attestations, get_previous_epoch_boundary_attestations, and get_previous_epoch_matching_head_attestations
* update BeaconState to 0.6.2; simplify legacy get_crosslink_committees_at_slot infrastructure a bit by noting that registry_change is always false; reimplment 0.5 get_crosslink_committees_at_slot in terms of 0.6 get_crosslink_committee
* mark process_deposit(...), get_block_root_at_slot(...), get_block_root(...), Deposit, BeaconBlockHeader, BeaconBlockBody, hash(...), get_active_index_root(...), various constants, get_shard_delta(...), get_epoch_start_shard(...), get_crosslink_committee(...), processRandao(...), processVoluntaryExits(...), cacheState(...) as 0.6.2
* rm removed-since-0.5 split(...), is_power_of_2(...), get_shuffling(...); rm 0.5 versions of get_active_validator_indices and get_epoch_committee_count; add a few tests for integer_squareroot
* mark bytes_to_int(...) and advanceState(...) as 0.6.2
* rm 0.5 get_attesting_indices; update get_attesting_balance to 0.6.2
* another tiny commit to poke AppVeyor to maybe not timeout at connecting to GitHub partway through CI: mark get_churn_limit(...), initiate_validator_exit(...), and Validator as 0.6.2
* mark get_attestation_slot(...), AttestationDataAndCustodyBit, and BeaconBlock as 0.6.2
2019-06-03 10:31:04 +00:00
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# Detect potential underflow
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doAssert LATEST_RANDAO_MIXES_LENGTH >= MIN_SEED_LOOKAHEAD
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2019-05-23 11:13:02 +00:00
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seed_input[0..31] =
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get_randao_mix(state,
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2019-07-15 12:57:18 +00:00
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epoch + LATEST_RANDAO_MIXES_LENGTH - MIN_SEED_LOOKAHEAD - 1).data
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More 0.8.0 updates (#311)
* replace BeaconState.finalized_{epoch,root} with BeaconState.finalized_checkpoint; rename get_delayed_activation_exit_epoch(...) to compute_activation_exit_epoch(...) and mark as 0.8.0; update get_churn_limit(...)/get_validator_churn_limit(...) to 0.8.0; update process_registry_updates(...) to 0.8.0
* update process_crosslinks(...) to 0.8.0; mark compute_start_slot_of_epoch(...) and get_committee_count(...) as 0.8.0
* mark Fork, is_slashable_validator(...), and get_beacon_proposer_index(...) as 0.8.0
* rename LATEST_SLASHED_EXIT_LENGTH to EPOCHS_PER_SLASHINGS_VECTOR; update process_slashings(...) to 0.8.0; remove pointless type conversion warning in get_previous_epoch(...)
* convert remaining references to finalized_epoch to finalized_checkpoint.epoch
* update slash_validator(...) to 0.8.0; mark inital value, Gwei, and time constants as 0.8.0; mark hash(...) and processBlockHeader(...) as 0.8.0
* rename WHISTLEBLOWING_REWARD_QUOTIENT to WHISTLEBLOWER_REWARD_QUOTIENT; rename LATEST_ACTIVE_INDEX_ROOTS_LENGTH to EPOCHS_PER_HISTORICAL_VECTOR (randao will also get merged into this); remove get_active_index_root(...); mark time parameter, signature domain types, and max operations per block constants as 0.8.0; update rewards and penalties constants to 0.8.0
* update is_valid_indexed_attestation(...) to 0.8.0; mark process_slot(...) as 0.8.0
* replace BeaconState.{current,previous}_justified_{epoch,root} with BeaconState.{current,previous}_justified_checkpoint
2019-07-05 08:30:05 +00:00
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seed_input[32..63] =
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state.active_index_roots[epoch mod EPOCHS_PER_HISTORICAL_VECTOR].data
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2019-02-13 10:26:32 +00:00
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seed_input[64..95] = int_to_bytes32(epoch)
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2019-01-29 03:22:22 +00:00
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eth2hash(seed_input)
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