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nimbus-eth2/beacon_chain/spec/presets/mainnet.nim

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# beacon_chain
# Copyright (c) 2018-2020 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.
# This file contains constants that are part of the spec and thus subject to
# serialization and spec updates.
import
math
type
Slot* = distinct uint64
Epoch* = distinct uint64
{.experimental: "codeReordering".} # SLOTS_PER_EPOCH is use before being defined in spec
const
# Misc
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L6
MAX_COMMITTEES_PER_SLOT* {.intdefine.} = 64
TARGET_COMMITTEE_SIZE* = 2^7 ##\
## Number of validators in the committee attesting to one shard
## Per spec:
## For the safety of crosslinks `TARGET_COMMITTEE_SIZE` exceeds
## [the recommended minimum committee size of 111](https://vitalik.ca/files/Ithaca201807_Sharding.pdf);
## with sufficient active validators (at least
## `SLOTS_PER_EPOCH * TARGET_COMMITTEE_SIZE`), the shuffling algorithm ensures
## committee sizes at least `TARGET_COMMITTEE_SIZE`. (Unbiasable randomness
## with a Verifiable Delay Function (VDF) will improve committee robustness
## and lower the safe minimum committee size.)
MAX_VALIDATORS_PER_COMMITTEE* = 2048 ##\
## votes
MIN_PER_EPOCH_CHURN_LIMIT* = 4
CHURN_LIMIT_QUOTIENT* = 2^16
SHUFFLE_ROUND_COUNT* = 90
MIN_GENESIS_ACTIVE_VALIDATOR_COUNT* {.intdefine.} = 16384
MIN_GENESIS_TIME* {.intdefine.} = 1578009600
HYSTERESIS_QUOTIENT* = 4
HYSTERESIS_DOWNWARD_MULTIPLIER* = 1
HYSTERESIS_UPWARD_MULTIPLIER* = 5
# Gwei values
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L58
MIN_DEPOSIT_AMOUNT* = 2'u64^0 * 10'u64^9 ##\
## Minimum amounth of ETH that can be deposited in one call - deposits can
## be used either to top up an existing validator or commit to a new one
MAX_EFFECTIVE_BALANCE* = 2'u64^5 * 10'u64^9 ##\
## Maximum amounth of ETH that can be deposited in one call
EJECTION_BALANCE* = 2'u64^4 * 10'u64^9 ##\
## Once the balance of a validator drops below this, it will be ejected from
## the validator pool
EFFECTIVE_BALANCE_INCREMENT* = 2'u64^0 * 10'u64^9
# Initial values
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L70
GENESIS_FORK_VERSION* = [0'u8, 0'u8, 0'u8, 0'u8]
BLS_WITHDRAWAL_PREFIX* = 0'u8
# Time parameters
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L77
GENESIS_DELAY* = 172800 # 172800 seconds (2 days)
SECONDS_PER_SLOT*{.intdefine.} = 12'u64 # Compile with -d:SECONDS_PER_SLOT=1 for 12x faster slots
## TODO consistent time unit across projects, similar to C++ chrono?
MIN_ATTESTATION_INCLUSION_DELAY* = 1 ##\
## (12 seconds)
## Number of slots that attestations stay in the attestation
## pool before being added to a block.
## The attestation delay exists so that there is time for attestations to
## propagate before the block is created.
## When creating an attestation, the validator will look at the best
## information known to at that time, and may not revise it during the same
## slot (see `is_double_vote`) - the delay gives the validator a chance to
## wait towards the end of the slot and still have time to publish the
## attestation.
SLOTS_PER_EPOCH* {.intdefine.} = 32 ##\
## (~6.4 minutes)
## slots that make up an epoch, at the end of which more heavy
## processing is done
## Compile with -d:SLOTS_PER_EPOCH=4 for shorter epochs
MIN_SEED_LOOKAHEAD* = 1 ##\
## epochs (~6.4 minutes)
SHARD_COMMITTEE_PERIOD* = 256 # epochs (~27 hours)
MAX_SEED_LOOKAHEAD* = 4 ##\
## epochs (~25.6 minutes)
EPOCHS_PER_ETH1_VOTING_PERIOD* = 32 ##\
## epochs (~3.4 hours)
SLOTS_PER_HISTORICAL_ROOT* = 8192 ##\
## slots (13 hours)
MIN_VALIDATOR_WITHDRAWABILITY_DELAY* = 2'u64^8 ##\
## epochs (~27 hours)
MAX_EPOCHS_PER_CROSSLINK* = 2'u64^6 ##\
## epochs (~7 hours)
MIN_EPOCHS_TO_INACTIVITY_PENALTY* = 2'u64^2 ##\
## epochs (25.6 minutes)
# State vector lengths
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L105
EPOCHS_PER_HISTORICAL_VECTOR* = 65536 ##\
## epochs (~0.8 years)
EPOCHS_PER_SLASHINGS_VECTOR* = 8192 ##\
## epochs (~36 days)
HISTORICAL_ROOTS_LIMIT* = 16777216 ##\
## epochs (~26,131 years)
VALIDATOR_REGISTRY_LIMIT* = 1099511627776
# Reward and penalty quotients
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L117
BASE_REWARD_FACTOR* = 2'u64^6
WHISTLEBLOWER_REWARD_QUOTIENT* = 2'u64^9
PROPOSER_REWARD_QUOTIENT* = 2'u64^3
INACTIVITY_PENALTY_QUOTIENT* = 2'u64^24
MIN_SLASHING_PENALTY_QUOTIENT* = 32 # 2^5
# Max operations per block
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L131
MAX_PROPOSER_SLASHINGS* = 2^4
MAX_ATTESTER_SLASHINGS* = 2^1
MAX_ATTESTATIONS* = 2^7
MAX_DEPOSITS* = 2^4
MAX_VOLUNTARY_EXITS* = 2^4
# Fork choice
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L32
SAFE_SLOTS_TO_UPDATE_JUSTIFIED* = 8 # 96 seconds
# Validators
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L38
ETH1_FOLLOW_DISTANCE* = 1024 # blocks ~ 4 hours
TARGET_AGGREGATORS_PER_COMMITTEE* = 16 # validators
RANDOM_SUBNETS_PER_VALIDATOR* = 1 # subnet
EPOCHS_PER_RANDOM_SUBNET_SUBSCRIPTION* = 256 # epochs ~ 27 hours
SECONDS_PER_ETH1_BLOCK* = 14 # (estimate from Eth1 mainnet)
# Phase 1: Upgrade from Phase 0
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L161
PHASE_1_FORK_VERSION* = 1
PHASE_1_GENESIS_SLOT* = 32 # [STUB]
INITIAL_ACTIVE_SHARDS* = 64
# Phase 1: General
# ---------------------------------------------------------------
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L166
MAX_SHARDS* = 1024
ONLINE_PERIOD* = 8 # epochs (~51 min)
LIGHT_CLIENT_COMMITTEE_SIZE* = 128
LIGHT_CLIENT_COMMITTEE_PERIOD* = 256 # epochs (~27 hours)
SHARD_BLOCK_CHUNK_SIZE* = 262144
MAX_SHARD_BLOCK_CHUNKS* = 4
TARGET_SHARD_BLOCK_SIZE* = 196608
MAX_SHARD_BLOCKS_PER_ATTESTATION* = 12
MAX_GASPRICE* = 16384 # Gwei
MIN_GASPRICE* = 8 # Gwei
GASPRICE_ADJUSTMENT_COEFFICIENT* = 8
# Phase 1: Custody game
# ---------------------------------------------------------------
# Time parameters
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L199
RANDAO_PENALTY_EPOCHS* = 2 # epochs (12.8 minutes)
EARLY_DERIVED_SECRET_PENALTY_MAX_FUTURE_EPOCHS* = 16384 # epochs (~73 days)
EPOCHS_PER_CUSTODY_PERIOD* = 2048 # epochs (~9 days)
CUSTODY_PERIOD_TO_RANDAO_PADDING* = 2048 # epochs (~9 days)
MAX_REVEAL_LATENESS_DECREMENT* = 128 # epochs (~14 hours)
# Max operations
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L211
MAX_CUSTODY_KEY_REVEALS* = 256
MAX_EARLY_DERIVED_SECRET_REVEALS* = 1
MAX_CUSTODY_SLASHINGS* = 1
# Reward and penalty quotients
# https://github.com/ethereum/eth2.0-specs/blob/v0.11.3/configs/mainnet.yaml#L217
EARLY_DERIVED_SECRET_REVEAL_SLOT_REWARD_MULTIPLE* = 2
MINOR_REWARD_QUOTIENT* = 256
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