add default

app/upgrades.go

@@ -21,6 +21,7 @@ import (
 	upgradetypes "cosmossdk.io/x/upgrade/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/module"
+	evmtypes "github.com/evmos/ethermint/x/evm/types"
 )
 
 func (app *EthermintApp) RegisterUpgradeHandlers() {
@@ -34,7 +35,7 @@ func (app *EthermintApp) RegisterUpgradeHandlers() {
 			sdkCtx := sdk.UnwrapSDKContext(ctx)
 			{
 				params := app.EvmKeeper.GetParams(sdkCtx)
-				params.HeaderHashNum = 10000
+				params.HeaderHashNum = evmtypes.DefaultHeaderHashNum
 				if err := app.EvmKeeper.SetParams(sdkCtx, params); err != nil {
 					return m, err
 				}

x/evm/types/params.go

@@ -34,6 +34,8 @@ var (
 	DefaultEnableCreate = true
 	// DefaultEnableCall enables contract calls (i.e true)
 	DefaultEnableCall = true
+	// DefaultHeaderHashNum defines the default number of header hash to persist.
+	DefaultHeaderHashNum = uint64(10000)
 )
 
 // NewParams creates a new Params instance
@@ -58,6 +60,7 @@ func DefaultParams() Params {
 		EnableCall:          DefaultEnableCall,
 		ChainConfig:         config,
 		AllowUnprotectedTxs: DefaultAllowUnprotectedTxs,
+		HeaderHashNum:       DefaultHeaderHashNum,
 	}
 }