feat(mainnet): add task to update min base fee to 2M wei

[niran]

Updates the minBaseFee parameter from 1,000,000 wei to 2,000,000 wei (2x increase).

Parameters

Parameter	From	To
minBaseFee	1,000,000 wei	2,000,000 wei

Validation

Updates storage slot:

• 0x6c: minBaseFee from 1,000,000 (0xf4240) to 2,000,000 (0x1e8480)

Includes rollback task that reverts to previous value if needed.

Diff from previous min base fee task

--- a/mainnet/2026-01-20-update-basefee-da-footprint/script/SetMinBaseFeeAndDAFootprint.s.sol
+++ b/mainnet/2026-01-28-update-min-base-fee/script/SetMinBaseFee.s.sol
@@ -10,18 +10,14 @@
 interface ISystemConfig {
     function minBaseFee() external view returns (uint64);
     function setMinBaseFee(uint64 _minBaseFee) external;
-    function daFootprintGasScalar() external view returns (uint16);
-    function setDAFootprintGasScalar(uint16 _daFootprintGasScalar) external;
 }
 
-contract SetMinBaseFeeAndDAFootprintScript is MultisigScript {
+contract SetMinBaseFeeScript is MultisigScript {
     address internal immutable OWNER_SAFE;
     address internal immutable SYSTEM_CONFIG;
 
     uint64 internal immutable MIN_BASE_FEE;
     uint64 internal immutable NEW_MIN_BASE_FEE;
-    uint16 internal immutable DA_FOOTPRINT_GAS_SCALAR;
-    uint16 internal immutable NEW_DA_FOOTPRINT_GAS_SCALAR;
 
     constructor() {
         OWNER_SAFE = vm.envAddress("OWNER_SAFE");
@@ -29,47 +25,20 @@
 
         MIN_BASE_FEE = uint64(vm.envUint("OLD_MIN_BASE_FEE"));
         NEW_MIN_BASE_FEE = uint64(vm.envUint("NEW_MIN_BASE_FEE"));
-
-        DA_FOOTPRINT_GAS_SCALAR = uint16(vm.envUint("OLD_DA_FOOTPRINT_GAS_SCALAR"));
-        NEW_DA_FOOTPRINT_GAS_SCALAR = uint16(vm.envUint("NEW_DA_FOOTPRINT_GAS_SCALAR"));
     }
 
     function _postCheck(Vm.AccountAccess[] memory, Simulation.Payload memory) internal view override {
         vm.assertEq(ISystemConfig(SYSTEM_CONFIG).minBaseFee(), NEW_MIN_BASE_FEE, "Min base fee mismatch");
-        vm.assertEq(
-            ISystemConfig(SYSTEM_CONFIG).daFootprintGasScalar(),
-            NEW_DA_FOOTPRINT_GAS_SCALAR,
-            "DA Footprint Gas Scalar mismatch"
-        );
     }
 
     function _simulationOverrides() internal view override returns (Simulation.StateOverride[] memory _stateOverrides) {
-        if (
-            MIN_BASE_FEE \!= ISystemConfig(SYSTEM_CONFIG).minBaseFee()
-                || DA_FOOTPRINT_GAS_SCALAR \!= ISystemConfig(SYSTEM_CONFIG).daFootprintGasScalar()
-        ) {
+        if (MIN_BASE_FEE \!= ISystemConfig(SYSTEM_CONFIG).minBaseFee()) {
             // Override SystemConfig state to the expected "from" values so simulations succeeds even
             // when the chain already reflects the post-change values (during rollback simulation).
 
             Simulation.StateOverride[] memory stateOverrides = new Simulation.StateOverride[](1);
-            Simulation.StorageOverride[] memory storageOverrides = new Simulation.StorageOverride[](2);
+            Simulation.StorageOverride[] memory storageOverrides = new Simulation.StorageOverride[](1);
 
-            // Update DA Footprint Gas Scalar (slot 0x6a)
-            // Storage layout (low to high bits):
-            //   - eip1559Denominator (uint32): bits 0-31
-            //   - eip1559Elasticity (uint32): bits 32-63
-            //   - operatorFeeScalar (uint32): bits 64-95
-            //   - operatorFeeConstant (uint64): bits 96-159
-            //   - daFootprintGasScalar (uint16): bits 160-175
-            // Load existing slot to preserve other fields, then update daFootprintGasScalar.
-            bytes32 eip1559SlotKey = bytes32(uint256(0x6a));
-            uint256 existingEip1559Word = uint256(vm.load(SYSTEM_CONFIG, eip1559SlotKey));
-            // Mask to preserve bits 0-159 (everything except daFootprintGasScalar)
-            uint256 preserveMask = (1 << 160) - 1;
-            uint256 preservedFields = existingEip1559Word & preserveMask;
-            uint256 composedEip1559Word = (uint256(DA_FOOTPRINT_GAS_SCALAR) << 160) | preservedFields;
-            storageOverrides[0] = Simulation.StorageOverride({key: eip1559SlotKey, value: bytes32(composedEip1559Word)});
-
             // Update minBaseFee (slot 0x6c)
             // Storage layout (low to high bits):
             //   - superchainConfig (address): bits 0-159
@@ -78,7 +47,7 @@
             bytes32 minBaseFeeSlotKey = bytes32(uint256(0x6c));
             uint256 existingMinBaseFeeWord = uint256(vm.load(SYSTEM_CONFIG, minBaseFeeSlotKey));
             uint256 updatedMinBaseFeeWord = (existingMinBaseFeeWord & ((1 << 160) - 1)) | (uint256(MIN_BASE_FEE) << 160);
-            storageOverrides[1] = Simulation.StorageOverride({key: minBaseFeeSlotKey, value: bytes32(updatedMinBaseFeeWord)});
+            storageOverrides[0] = Simulation.StorageOverride({key: minBaseFeeSlotKey, value: bytes32(updatedMinBaseFeeWord)});
 
             stateOverrides[0] = Simulation.StateOverride({contractAddress: SYSTEM_CONFIG, overrides: storageOverrides});
             return stateOverrides;
@@ -86,18 +55,11 @@
     }
 
     function _buildCalls() internal view override returns (IMulticall3.Call3Value[] memory) {
-        IMulticall3.Call3Value[] memory calls = new IMulticall3.Call3Value[](2);
+        IMulticall3.Call3Value[] memory calls = new IMulticall3.Call3Value[](1);
 
         calls[0] = IMulticall3.Call3Value({
             target: SYSTEM_CONFIG,
             allowFailure: false,
-            callData: abi.encodeCall(ISystemConfig.setDAFootprintGasScalar, (NEW_DA_FOOTPRINT_GAS_SCALAR)),
-            value: 0
-        });
-
-        calls[1] = IMulticall3.Call3Value({
-            target: SYSTEM_CONFIG,
-            allowFailure: false,
             callData: abi.encodeCall(ISystemConfig.setMinBaseFee, (NEW_MIN_BASE_FEE)),
             value: 0
         });

[cb-heimdall]

✅ Heimdall Review Status

Requirement	Status	More Info
Reviews	✅ 2/2	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 2 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 2 2 1 if commit is unverified 0 Sum 2