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Parameters

This reference documents the configurable parameters for the Orbinum runtime.

Table of Contents​

Block Production​

ParameterValueDescription
MILLISECS_PER_BLOCK6000Block time in milliseconds
SLOT_DURATION6000Slot duration for consensus
EPOCH_DURATION_IN_BLOCKS600Blocks per epoch (~1 hour)
MINUTES10Blocks per minute
HOURS600Blocks per hour
DAYS14400Blocks per day
pub const MILLISECS_PER_BLOCK: u64 = 6000;
pub const SLOT_DURATION: u64 = MILLISECS_PER_BLOCK;

pub const MINUTES: BlockNumber = 60_000 / (MILLISECS_PER_BLOCK as BlockNumber);
pub const HOURS: BlockNumber = MINUTES * 60;
pub const DAYS: BlockNumber = HOURS * 24;

Balances​

Token Economics​

ParameterValueDescription
UNITS1,000,000,000,000,000,00010^18 (18 decimals)
MILLIUNIT1,000,000,000,000,00010^15
MICROUNIT1,000,000,000,00010^12

Existential Deposit​

ParameterValueDescription
ExistentialDeposit1 MILLIUNITMinimum account balance
parameter_types! {
    pub const ExistentialDeposit: Balance = MILLIUNIT;
    pub const MaxLocks: u32 = 50;
    pub const MaxReserves: u32 = 50;
}

EVM​

Gas Configuration​

ParameterValueDescription
BlockGasLimit15,000,000Max gas per block
GasTarget7,500,000Target utilization (50%)
WeightPerGas20,000Substrate weight per gas unit

Fee Configuration​

ParameterValueDescription
DefaultBaseFeePerGas1 GweiInitial base fee
MinBaseFeePerGas0.001 GweiMinimum base fee
MaxBaseFeePerGas100 GweiMaximum base fee
BaseFeeChangeRate12.5%Max change per block
parameter_types! {
    pub BlockGasLimit: U256 = U256::from(15_000_000);
    pub WeightPerGas: Weight = Weight::from_parts(20_000, 0);
    
    pub DefaultBaseFeePerGas: U256 = U256::from(1_000_000_000);
    pub MinBaseFeePerGas: U256 = U256::from(1_000_000);
    pub MaxBaseFeePerGas: U256 = U256::from(100_000_000_000);
}

Precompile Costs​

PrecompileAddressBase Gas
ECRecover0x013,000
SHA2560x0260 + 12/word
RIPEMD1600x03600 + 120/word
Identity0x0415 + 3/word
Modexp0x05Variable
BN254 Add0x06150
BN254 Mul0x076,000
BN254 Pairing0x0834,000 + 45,000/pair
Blake20x09Variable

Shielded Pool​

Pool Configuration​

ParameterValueDescription
MaxTreeDepth20Merkle tree depth
MaxLeaves1,048,576Max commitments (2²⁰)
HistoricRootsToKeep100Historic roots stored
MinShieldAmount1 UNITMinimum shield amount
parameter_types! {
    pub const MaxTreeDepth: u32 = 20;
    pub const MaxLeaves: u32 = 1_048_576;
    pub const HistoricRootsToKeep: u32 = 100;
    pub const MinShieldAmount: Balance = UNITS;
}

Operation Weights​

OperationBase WeightPer-Input Weight
Shield50,000-
Transfer100,00050,000
Unshield75,000-

ZK Verifier​

Proof Configuration​

ParameterValueDescription
MaxProofSize256Max proof bytes
MaxPublicInputs16Max public inputs
MaxCircuits100Max registered circuits
parameter_types! {
    pub const MaxProofSize: u32 = 256;
    pub const MaxPublicInputs: u32 = 16;
    pub const MaxCircuits: u32 = 100;
}

Verification Costs​

CircuitVerification Weight
Shield~150,000
Transfer (2-in-2-out)~200,000
Unshield~175,000

System Limits​

Transaction Limits​

ParameterValueDescription
MaxBlockWeight2 sec equivMax block processing time
MaxBlockLength5 MBMax block size
MaxExtrinsicWeight75% blockMax single tx weight

Storage Limits​

ParameterValueDescription
MaxReaders512Max concurrent reads
MaxActiveOutbound100Max outbound transfers

Governance Parameters​

WIP

Governance parameters are not yet finalized.

ParameterProposed ValueDescription
VotingPeriod7 DAYSProposal voting duration
EnactmentPeriod1 DAYDelay before execution
MinimumDeposit100 UNITSProposal deposit
MaxProposals100Max active proposals

Modifying Parameters​

Runtime Upgrade​

Parameters can be changed through runtime upgrades:

// In runtime/src/lib.rs
parameter_types! {
    pub const NewParameter: u32 = 200; // Changed from 100
}

Governance​

Some parameters are governance-controlled:

#[pallet::call]
impl<T: Config> Pallet<T> {
    #[pallet::call_index(0)]
    pub fn set_parameter(
        origin: OriginFor<T>,
        new_value: u32,
    ) -> DispatchResult {
        ensure_root(origin)?;
        Parameter::<T>::put(new_value);
        Ok(())
    }
}