2019-05-27 12:48:13 +00:00
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# beacon_chain
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2020-01-27 11:36:17 +00:00
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# Copyright (c) 2018-2020 Status Research & Development GmbH
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2019-05-27 12:48:13 +00:00
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# Licensed and distributed under either of
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2019-11-25 15:30:02 +00:00
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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2019-05-27 12:48:13 +00:00
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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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# This file contains constants that are part of the spec and thus subject to
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# serialization and spec updates.
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import
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2019-10-25 10:59:56 +00:00
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math
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2019-05-27 12:48:13 +00:00
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type
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Slot* = distinct uint64
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Epoch* = distinct uint64
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{.experimental: "codeReordering".} # SLOTS_PER_EPOCH is use before being defined in spec
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const
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# Misc
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# ---------------------------------------------------------------
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2020-04-06 18:55:47 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L6
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2019-05-27 12:48:13 +00:00
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2019-11-12 05:35:52 +00:00
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MAX_COMMITTEES_PER_SLOT* {.intdefine.} = 64
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2019-05-27 12:48:13 +00:00
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TARGET_COMMITTEE_SIZE* = 2^7 ##\
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## Number of validators in the committee attesting to one shard
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## Per spec:
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## For the safety of crosslinks `TARGET_COMMITTEE_SIZE` exceeds
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## [the recommended minimum committee size of 111](https://vitalik.ca/files/Ithaca201807_Sharding.pdf);
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## with sufficient active validators (at least
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## `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures
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## committee sizes at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness
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## with a Verifiable Delay Function (VDF) will improve committee robustness
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## and lower the safe minimum committee size.)
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2019-11-22 12:08:07 +00:00
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MAX_VALIDATORS_PER_COMMITTEE* = 2048 ##\
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2019-05-27 12:48:13 +00:00
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## votes
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MIN_PER_EPOCH_CHURN_LIMIT* = 4
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CHURN_LIMIT_QUOTIENT* = 2^16
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SHUFFLE_ROUND_COUNT* = 90
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2019-11-22 12:08:07 +00:00
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MIN_GENESIS_TIME* {.intdefine.} = 1578009600
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MIN_GENESIS_ACTIVE_VALIDATOR_COUNT* {.intdefine.} = 16384
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2019-05-27 12:48:13 +00:00
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2020-03-14 21:54:45 +00:00
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HYSTERESIS_QUOTIENT* = 4
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HYSTERESIS_DOWNWARD_MULTIPLIER* = 1
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HYSTERESIS_UPWARD_MULTIPLIER* = 5
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2019-05-27 12:48:13 +00:00
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# Gwei values
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# ---------------------------------------------------------------
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2020-03-30 11:31:44 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L58
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2019-05-27 12:48:13 +00:00
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MIN_DEPOSIT_AMOUNT* = 2'u64^0 * 10'u64^9 ##\
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## Minimum amounth of ETH that can be deposited in one call - deposits can
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## be used either to top up an existing validator or commit to a new one
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MAX_EFFECTIVE_BALANCE* = 2'u64^5 * 10'u64^9 ##\
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## Maximum amounth of ETH that can be deposited in one call
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EJECTION_BALANCE* = 2'u64^4 * 10'u64^9 ##\
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## Once the balance of a validator drops below this, it will be ejected from
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## the validator pool
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EFFECTIVE_BALANCE_INCREMENT* = 2'u64^0 * 10'u64^9
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# Initial values
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# ---------------------------------------------------------------
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2020-04-03 18:52:55 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L70
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2020-04-06 18:18:42 +00:00
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GENESIS_FORK_VERSION* = [0'u8, 0'u8, 0'u8, 0'u8]
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2019-06-14 16:21:04 +00:00
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BLS_WITHDRAWAL_PREFIX* = 0'u8
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# Time parameters
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# ---------------------------------------------------------------
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2020-04-10 13:59:17 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L77
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2020-01-14 17:46:58 +00:00
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MIN_GENESIS_DELAY* = 86400 # 86400 seconds (1 day)
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2019-05-27 12:48:13 +00:00
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2019-11-22 12:08:07 +00:00
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SECONDS_PER_SLOT*{.intdefine.} = 12'u64 # Compile with -d:SECONDS_PER_SLOT=1 for 12x faster slots
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2019-05-27 12:48:13 +00:00
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## TODO consistent time unit across projects, similar to C++ chrono?
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2019-07-08 13:19:52 +00:00
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MIN_ATTESTATION_INCLUSION_DELAY* = 1 ##\
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initial 0.9.0 spec sync (#509)
* rename compute_epoch_of_slot(...) to compute_epoch_at_slot(...)
* remove some unnecessary imports; remove some crosslink-related code and tests; complete renaming of compute_epoch_of_slot(...) to compute_epoch_at_slot(...)
* rm more transfer-related code and tests; rm more unnecessary strutils imports
* rm remaining unused imports
* remove useless get_empty_per_epoch_cache(...)/compute_start_slot_of_epoch(...) calls
* rename compute_start_slot_of_epoch(...) to compute_start_slot_at_epoch(...)
* rename ACTIVATION_EXIT_DELAY to MAX_SEED_LOOKAHEAD
* update domain types to 0.9.0
* mark AttesterSlashing, IndexedAttestation, AttestationDataAndCustodyBit, DepositData, BeaconBlockHeader, Fork, integer_squareroot(...), and process_voluntary_exit(...) as 0.9.0
* mark increase_balance(...), decrease_balance(...), get_block_root(...), CheckPoint, Deposit, PendingAttestation, HistoricalBatch, is_active_validator(...), and is_slashable_attestation_data(...) as 0.9.0
* mark compute_activation_exit_epoch(...), bls_verify(...), Validator, get_active_validator_indices(...), get_current_epoch(...), get_total_active_balance(...), and get_previous_epoch(...) as 0.9.0
* mark get_block_root_at_slot(...), ProposerSlashing, get_domain(...), VoluntaryExit, mainnet preset Gwei values, minimal preset max operations, process_block_header(...), and is_slashable_validator(...) as 0.9.0
* mark makeWithdrawalCredentials(...), get_validator_churn_limit(...), get_total_balance(...), is_valid_indexed_attestation(...), bls_aggregate_pubkeys(...), initial genesis value/constants, Attestation, get_randao_mix(...), mainnet preset max operations per block constants, minimal preset Gwei values and time parameters, process_eth1_data(...), get_shuffled_seq(...), compute_committee(...), and process_slots(...) as 0.9.0; partially update get_indexed_attestation(...) to 0.9.0 by removing crosslink refs and associated tests
* mark initiate_validator_exit(...), process_registry_updates(...), BeaconBlock, Eth1Data, compute_domain(...), process_randao(...), process_attester_slashing(...), get_base_reward(...), and process_slot(...) as 0.9.0
2019-10-30 19:41:19 +00:00
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## (12 seconds)
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## Number of slots that attestations stay in the attestation
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## pool before being added to a block.
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## The attestation delay exists so that there is time for attestations to
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## propagate before the block is created.
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## When creating an attestation, the validator will look at the best
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## information known to at that time, and may not revise it during the same
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## slot (see `is_double_vote`) - the delay gives the validator a chance to
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## wait towards the end of the slot and still have time to publish the
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## attestation.
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2019-11-08 10:30:22 +00:00
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SLOTS_PER_EPOCH* {.intdefine.} = 32 ##\
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2019-05-27 12:48:13 +00:00
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## (~6.4 minutes)
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## slots that make up an epoch, at the end of which more heavy
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## processing is done
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## Compile with -d:SLOTS_PER_EPOCH=4 for shorter epochs
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MIN_SEED_LOOKAHEAD* = 1 ##\
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## epochs (~6.4 minutes)
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initial 0.9.0 spec sync (#509)
* rename compute_epoch_of_slot(...) to compute_epoch_at_slot(...)
* remove some unnecessary imports; remove some crosslink-related code and tests; complete renaming of compute_epoch_of_slot(...) to compute_epoch_at_slot(...)
* rm more transfer-related code and tests; rm more unnecessary strutils imports
* rm remaining unused imports
* remove useless get_empty_per_epoch_cache(...)/compute_start_slot_of_epoch(...) calls
* rename compute_start_slot_of_epoch(...) to compute_start_slot_at_epoch(...)
* rename ACTIVATION_EXIT_DELAY to MAX_SEED_LOOKAHEAD
* update domain types to 0.9.0
* mark AttesterSlashing, IndexedAttestation, AttestationDataAndCustodyBit, DepositData, BeaconBlockHeader, Fork, integer_squareroot(...), and process_voluntary_exit(...) as 0.9.0
* mark increase_balance(...), decrease_balance(...), get_block_root(...), CheckPoint, Deposit, PendingAttestation, HistoricalBatch, is_active_validator(...), and is_slashable_attestation_data(...) as 0.9.0
* mark compute_activation_exit_epoch(...), bls_verify(...), Validator, get_active_validator_indices(...), get_current_epoch(...), get_total_active_balance(...), and get_previous_epoch(...) as 0.9.0
* mark get_block_root_at_slot(...), ProposerSlashing, get_domain(...), VoluntaryExit, mainnet preset Gwei values, minimal preset max operations, process_block_header(...), and is_slashable_validator(...) as 0.9.0
* mark makeWithdrawalCredentials(...), get_validator_churn_limit(...), get_total_balance(...), is_valid_indexed_attestation(...), bls_aggregate_pubkeys(...), initial genesis value/constants, Attestation, get_randao_mix(...), mainnet preset max operations per block constants, minimal preset Gwei values and time parameters, process_eth1_data(...), get_shuffled_seq(...), compute_committee(...), and process_slots(...) as 0.9.0; partially update get_indexed_attestation(...) to 0.9.0 by removing crosslink refs and associated tests
* mark initiate_validator_exit(...), process_registry_updates(...), BeaconBlock, Eth1Data, compute_domain(...), process_randao(...), process_attester_slashing(...), get_base_reward(...), and process_slot(...) as 0.9.0
2019-10-30 19:41:19 +00:00
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MAX_SEED_LOOKAHEAD* = 4 ##\
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2019-05-27 12:48:13 +00:00
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## epochs (~25.6 minutes)
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2020-03-14 21:54:45 +00:00
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EPOCHS_PER_ETH1_VOTING_PERIOD* = 32 ##\
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## epochs (~3.4 hours)
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2019-05-27 12:48:13 +00:00
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SLOTS_PER_HISTORICAL_ROOT* = 8192 ##\
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## slots (13 hours)
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MIN_VALIDATOR_WITHDRAWABILITY_DELAY* = 2'u64^8 ##\
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## epochs (~27 hours)
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PERSISTENT_COMMITTEE_PERIOD* = 2'u64^11 ##\
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## epochs (9 days)
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2019-07-02 21:14:55 +00:00
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MAX_EPOCHS_PER_CROSSLINK* = 2'u64^6 ##\
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2019-05-27 12:48:13 +00:00
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## epochs (~7 hours)
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MIN_EPOCHS_TO_INACTIVITY_PENALTY* = 2'u64^2 ##\
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## epochs (25.6 minutes)
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2019-09-05 19:52:34 +00:00
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# State vector lengths
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2019-05-27 12:48:13 +00:00
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# ---------------------------------------------------------------
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2020-04-01 11:41:39 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L105
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EPOCHS_PER_HISTORICAL_VECTOR* = 65536 ##\
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## epochs (~0.8 years)
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EPOCHS_PER_SLASHINGS_VECTOR* = 8192 ##\
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## epochs (~36 days)
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HISTORICAL_ROOTS_LIMIT* = 16777216 ##\
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## epochs (~26,131 years)
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2019-07-03 07:35:05 +00:00
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VALIDATOR_REGISTRY_LIMIT* = 1099511627776
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2019-05-27 12:48:13 +00:00
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# Reward and penalty quotients
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# ---------------------------------------------------------------
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2020-04-03 18:52:55 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L117
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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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BASE_REWARD_FACTOR* = 2'u64^6
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WHISTLEBLOWER_REWARD_QUOTIENT* = 2'u64^9
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2019-05-27 12:48:13 +00:00
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PROPOSER_REWARD_QUOTIENT* = 2'u64^3
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INACTIVITY_PENALTY_QUOTIENT* = 2'u64^25
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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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MIN_SLASHING_PENALTY_QUOTIENT* = 32 # 2^5
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2019-05-27 12:48:13 +00:00
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# Max operations per block
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# ---------------------------------------------------------------
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2020-04-10 14:06:24 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L131
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2019-05-27 12:48:13 +00:00
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MAX_PROPOSER_SLASHINGS* = 2^4
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MAX_ATTESTER_SLASHINGS* = 2^0
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MAX_ATTESTATIONS* = 2^7
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MAX_DEPOSITS* = 2^4
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MAX_VOLUNTARY_EXITS* = 2^4
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2019-11-22 19:56:39 +00:00
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# Fork choice
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# ---------------------------------------------------------------
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2020-04-01 11:41:39 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L32
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2019-11-22 19:56:39 +00:00
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SAFE_SLOTS_TO_UPDATE_JUSTIFIED* = 8 # 96 seconds
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# Validators
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# ---------------------------------------------------------------
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2020-04-10 14:06:24 +00:00
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/configs/mainnet.yaml#L38
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2019-11-22 19:56:39 +00:00
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ETH1_FOLLOW_DISTANCE* = 1024 # blocks ~ 4 hours
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TARGET_AGGREGATORS_PER_COMMITTEE* = 16 # validators
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RANDOM_SUBNETS_PER_VALIDATOR* = 1 # subnet
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EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION* = 256 # epochs ~ 27 hours
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2020-01-14 17:46:58 +00:00
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SECONDS_PER_ETH1_BLOCK* = 14 # estimate from Eth1 mainnet)
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2019-11-22 19:56:39 +00:00
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2020-03-14 21:54:45 +00:00
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# Phase 1: Upgrade from Phase 0
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.0/configs/mainnet.yaml#L161
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PHASE_1_FORK_VERSION* = 1
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INITIAL_ACTIVE_SHARDS* = 64
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INITIAL_GASPRICE* = 10
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# Phase 1: General
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.0/configs/mainnet.yaml#L169
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MAX_SHARDS* = 1024
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ONLINE_PERIOD* = 8 # epochs (~51 min)
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LIGHT_CLIENT_COMMITTEE_SIZE* = 128
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LIGHT_CLIENT_COMMITTEE_PERIOD* = 256 # epochs (~27 hours)
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SHARD_COMMITTEE_PERIOD* = 256 # epochs (~27 hours)
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SHARD_BLOCK_CHUNK_SIZE* = 262144
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MAX_SHARD_BLOCK_CHUNKS* = 4
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TARGET_SHARD_BLOCK_SIZE* = 196608
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MAX_SHARD_BLOCKS_PER_ATTESTATION* = 12
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MAX_GASPRICE* = 16384 # Gwei
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MIN_GASPRICE* = 32 # Gwei
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GASPRICE_ADJUSTMENT_COEFFICIENT* = 8
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# Phase 1: Custody game
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# ---------------------------------------------------------------
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# Time parameters
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.0/configs/mainnet.yaml#L202
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RANDAO_PENALTY_EPOCHS* = 2 # epchs (12.8 minutes)
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EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS* = 16384 # epochs (~73 days)
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EPOCHS_PER_CUSTODY_PERIOD* = 2048 # epochs (~9 days)
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CUSTODY_PERIOD_TO_RANDAO_PADDING* = 2048 # epochs (~9 days)
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MAX_REVEAL_LATENESS_DECREMENT* = 128 # epochs (~14 hours)
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# Max operations
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.0/configs/mainnet.yaml#L214
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MAX_CUSTODY_KEY_REVEALS* = 256
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MAX_EARLY_DERIVED_SECRET_REVEALS* = 1
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MAX_CUSTODY_SLASHINGS* = 1
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# Reward and penalty quotients
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.0/configs/mainnet.yaml#L220
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EARLY_DERIVED_SECRET_REVEAL_SLOT_REWARD_MULTIPLE* = 2
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MINOR_REWARD_QUOTIENT* = 256
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