185 lines
7.0 KiB
Nim
185 lines
7.0 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2019 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 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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# 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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math
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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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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L6
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MAX_COMMITTEES_PER_SLOT* {.intdefine.} = 64
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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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MAX_VALIDATORS_PER_COMMITTEE* = 2048 ##\
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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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MIN_GENESIS_TIME* {.intdefine.} = 1578009600
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MIN_GENESIS_ACTIVE_VALIDATOR_COUNT* {.intdefine.} = 16384
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# Constants (TODO: not actually configurable)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_beacon-chain.md#constants
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BASE_REWARDS_PER_EPOCH* = 4
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DEPOSIT_CONTRACT_TREE_DEPTH* = 32
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# Gwei values
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L50
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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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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L62
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GENESIS_SLOT* = 0.Slot
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BLS_WITHDRAWAL_PREFIX* = 0'u8
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# Time parameters
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L69
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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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## TODO consistent time unit across projects, similar to C++ chrono?
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MIN_ATTESTATION_INCLUSION_DELAY* = 1 ##\
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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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SLOTS_PER_EPOCH* {.intdefine.} = 32 ##\
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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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MAX_SEED_LOOKAHEAD* = 4 ##\
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## epochs (~25.6 minutes)
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SLOTS_PER_ETH1_VOTING_PERIOD* = 1024 ##\
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## slots (~1.7 hours)
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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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MAX_EPOCHS_PER_CROSSLINK* = 2'u64^6 ##\
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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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EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS* = 16384
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# State vector lengths
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L98
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EPOCHS_PER_HISTORICAL_VECTOR* = 65536
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EPOCHS_PER_SLASHINGS_VECTOR* = 8192
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HISTORICAL_ROOTS_LIMIT* = 16777216
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VALIDATOR_REGISTRY_LIMIT* = 1099511627776
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# Reward and penalty quotients
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L110
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BASE_REWARD_FACTOR* = 2'u64^6
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WHISTLEBLOWER_REWARD_QUOTIENT* = 2'u64^9
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PROPOSER_REWARD_QUOTIENT* = 2'u64^3
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INACTIVITY_PENALTY_QUOTIENT* = 2'u64^25
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MIN_SLASHING_PENALTY_QUOTIENT* = 32 # 2^5
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# Max operations per block
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/configs/mainnet.yaml#L124
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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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# Fork choice
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/0_fork-choice.md#configuration
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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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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/validator/0_beacon-chain-validator.md#misc
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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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# Phase 1 - Sharding
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/1_shard-data-chains.md#time-parameters
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# TODO those are included in minimal.yaml but not mainnet.yaml
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# Why?
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# SHARD_SLOTS_PER_BEACON_SLOT* = 2 # spec: SHARD_SLOTS_PER_EPOCH
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# EPOCHS_PER_SHARD_PERIOD* = 4
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# PHASE_1_FORK_EPOCH* = 8
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# PHASE_1_FORK_SLOT* = 64
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# Phase 1 - Custody game
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# ---------------------------------------------------------------
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# https://github.com/ethereum/eth2.0-specs/blob/v0.9.2/specs/core/1_custody-game.md#constants
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# TODO those are included in minimal.yaml but not mainnet.yaml
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# Why?
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# EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS* = 4096 # epochs
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# EPOCHS_PER_CUSTODY_PERIOD* = 4
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# CUSTODY_PERIOD_TO_RANDAO_PADDING* = 4
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