Jovian: System Config
Table of Contents
Minimum Base Fee Configuration
Jovian adds a configuration value to SystemConfig to control the minimum base fee used by the EIP-1559 fee market
on OP Stack chains. The value is a minimum base fee in wei.
| Name | Type | Default | Meaning |
|---|---|---|---|
minBaseFee | uint64 | 0 | Minimum base fee in wei |
The configuration is updated via a new method on SystemConfig:
function setMinBaseFee(uint64 minBaseFee) external onlyOwner;
ConfigUpdate
The following ConfigUpdate event is defined where the CONFIG_VERSION is uint256(0):
| Name | Value | Definition | Usage |
|---|---|---|---|
BATCHER | uint8(0) | abi.encode(address) | Modifies the account that is authorized to progress the safe chain |
FEE_SCALARS | uint8(1) | (uint256(0x01) << 248) | (uint256(_blobbasefeeScalar) << 32) | _basefeeScalar | Modifies the fee scalars |
GAS_LIMIT | uint8(2) | abi.encode(uint64 _gasLimit) | Modifies the L2 gas limit |
UNSAFE_BLOCK_SIGNER | uint8(3) | abi.encode(address) | Modifies the account that is authorized to progress the unsafe chain |
EIP_1559_PARAMS | uint8(4) | uint256(uint64(uint32(_denominator))) << 32 | uint64(uint32(_elasticity)) | Modifies the EIP-1559 denominator and elasticity |
OPERATOR_FEE_PARAMS | uint8(5) | uint256(_operatorFeeScalar) << 64 | _operatorFeeConstant | Modifies the operator fee scalar and constant |
MIN_BASE_FEE | uint8(6) | abi.encode(uint64(_minBaseFee)) | Modifies the minimum base fee (wei) |
Modifying Minimum Base Fee
Upon update, the contract emits a ConfigUpdate event with a new UpdateType value MIN_BASE_FEE, enabling nodes
to derive the configuration from L1 logs.
Implementations MUST incorporate the configured value into the block header extraData as specified in
./exec-engine.md.
Interface
Minimum Base Fee Parameters
minBaseFee
This function returns the currently configured minimum base fee in wei.
function minBaseFee() external view returns (uint64);