path: root/params/protocol_params.go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package params

import "math/big"

var (
    TargetGasLimit = GenesisGasLimit // The artificial target
)

const (
    GasLimitBoundDivisor uint64 = 1024    // The bound divisor of the gas limit, used in update calculations.
    MinGasLimit          uint64 = 5000    // Minimum the gas limit may ever be.
    GenesisGasLimit      uint64 = 4712388 // Gas limit of the Genesis block.

    MaximumExtraDataSize  uint64 = 32    // Maximum size extra data may be after Genesis.
    ExpByteGas            uint64 = 10    // Times ceil(log256(exponent)) for the EXP instruction.
    SloadGas              uint64 = 50    // Multiplied by the number of 32-byte words that are copied (round up) for any *COPY operation and added.
    CallValueTransferGas  uint64 = 9000  // Paid for CALL when the value transfer is non-zero.
    CallNewAccountGas     uint64 = 25000 // Paid for CALL when the destination address didn't exist prior.
    TxGas                 uint64 = 21000 // Per transaction not creating a contract. NOTE: Not payable on data of calls between transactions.
    TxGasContractCreation uint64 = 53000 // Per transaction that creates a contract. NOTE: Not payable on data of calls between transactions.
    TxDataZeroGas         uint64 = 4     // Per byte of data attached to a transaction that equals zero. NOTE: Not payable on data of calls between transactions.
    QuadCoeffDiv          uint64 = 512   // Divisor for the quadratic particle of the memory cost equation.
    SstoreSetGas          uint64 = 20000 // Once per SLOAD operation.
    LogDataGas            uint64 = 8     // Per byte in a LOG* operation's data.
    CallStipend           uint64 = 2300  // Free gas given at beginning of call.

    Sha3Gas          uint64 = 30    // Once per SHA3 operation.
    Sha3WordGas      uint64 = 6     // Once per word of the SHA3 operation's data.
    SstoreResetGas   uint64 = 5000  // Once per SSTORE operation if the zeroness changes from zero.
    SstoreClearGas   uint64 = 5000  // Once per SSTORE operation if the zeroness doesn't change.
    SstoreRefundGas  uint64 = 15000 // Once per SSTORE operation if the zeroness changes to zero.
    JumpdestGas      uint64 = 1     // Refunded gas, once per SSTORE operation if the zeroness changes to zero.
    EpochDuration    uint64 = 30000 // Duration between proof-of-work epochs.
    CallGas          uint64 = 40    // Once per CALL operation & message call transaction.
    CreateDataGas    uint64 = 200   //
    CallCreateDepth  uint64 = 1024  // Maximum depth of call/create stack.
    ExpGas           uint64 = 10    // Once per EXP instruction
    LogGas           uint64 = 375   // Per LOG* operation.
    CopyGas          uint64 = 3     //
    StackLimit       uint64 = 1024  // Maximum size of VM stack allowed.
    TierStepGas      uint64 = 0     // Once per operation, for a selection of them.
    LogTopicGas      uint64 = 375   // Multiplied by the * of the LOG*, per LOG transaction. e.g. LOG0 incurs 0 * c_txLogTopicGas, LOG4 incurs 4 * c_txLogTopicGas.
    CreateGas        uint64 = 32000 // Once per CREATE operation & contract-creation transaction.
    SuicideRefundGas uint64 = 24000 // Refunded following a suicide operation.
    MemoryGas        uint64 = 3     // Times the address of the (highest referenced byte in memory + 1). NOTE: referencing happens on read, write and in instructions such as RETURN and CALL.
    TxDataNonZeroGas uint64 = 68    // Per byte of data attached to a transaction that is not equal to zero. NOTE: Not payable on data of calls between transactions.

    MaxCodeSize = 24576 // Maximum bytecode to permit for a contract

    // Precompiled contract gas prices

    EcrecoverGas            uint64 = 3000   // Elliptic curve sender recovery gas price
    Sha256BaseGas           uint64 = 60     // Base price for a SHA256 operation
    Sha256PerWordGas        uint64 = 12     // Per-word price for a SHA256 operation
    Ripemd160BaseGas        uint64 = 600    // Base price for a RIPEMD160 operation
    Ripemd160PerWordGas     uint64 = 120    // Per-word price for a RIPEMD160 operation
    IdentityBaseGas         uint64 = 15     // Base price for a data copy operation
    IdentityPerWordGas      uint64 = 3      // Per-work price for a data copy operation
    ModExpQuadCoeffDiv      uint64 = 20     // Divisor for the quadratic particle of the big int modular exponentiation
    Bn256AddGas             uint64 = 500    // Gas needed for an elliptic curve addition
    Bn256ScalarMulGas       uint64 = 40000  // Gas needed for an elliptic curve scalar multiplication
    Bn256PairingBaseGas     uint64 = 100000 // Base price for an elliptic curve pairing check
    Bn256PairingPerPointGas uint64 = 80000  // Per-point price for an elliptic curve pairing check
)

var (
    DifficultyBoundDivisor = big.NewInt(2048)   // The bound divisor of the difficulty, used in the update calculations.
    GenesisDifficulty      = big.NewInt(131072) // Difficulty of the Genesis block.
    MinimumDifficulty      = big.NewInt(131072) // The minimum that the difficulty may ever be.
    DurationLimit          = big.NewInt(13)     // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
)