extracted the standard ante handler

app/app.go

@@ -21,6 +21,7 @@ import (
 	tmtypes "github.com/tendermint/tendermint/types"
 
 	"github.com/Pylons-tech/pylons/x/pylons"
+	"github.com/Pylons-tech/pylons/x/pylons/handlers"
 	"github.com/Pylons-tech/pylons/x/pylons/keep"
 
 	bam "github.com/cosmos/cosmos-sdk/baseapp"
@@ -233,7 +234,7 @@ func NewPylonsApp(logger log.Logger, db dbm.DB, baseAppOptions ...func(*bam.Base
 
 	// The AnteHandler handles signature verification and transaction pre-processing
 	app.SetAnteHandler(
-		auth.NewAnteHandler(
+		handlers.NewAnteHandler(
 			app.accountKeeper,
 			app.supplyKeeper,
 			auth.DefaultSigVerificationGasConsumer,

x/pylons/handlers/custom_ante_handler.go

@@ -1 +1,27 @@
 package handlers
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth/ante"
+	"github.com/cosmos/cosmos-sdk/x/auth/keeper"
+	"github.com/cosmos/cosmos-sdk/x/auth/types"
+)
+
+// NewAnteHandler returns an AnteHandler that checks and increments sequence
+// numbers, checks signatures & account numbers, and deducts fees from the first
+// signer.
+func NewAnteHandler(ak keeper.AccountKeeper, supplyKeeper types.SupplyKeeper, sigGasConsumer ante.SignatureVerificationGasConsumer) sdk.AnteHandler {
+	return sdk.ChainAnteDecorators(
+		ante.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first
+		ante.NewMempoolFeeDecorator(),
+		ante.NewValidateBasicDecorator(),
+		ante.NewValidateMemoDecorator(ak),
+		ante.NewConsumeGasForTxSizeDecorator(ak),
+		ante.NewSetPubKeyDecorator(ak), // SetPubKeyDecorator must be called before all signature verification decorators
+		ante.NewValidateSigCountDecorator(ak),
+		ante.NewDeductFeeDecorator(ak, supplyKeeper),
+		ante.NewSigGasConsumeDecorator(ak, sigGasConsumer),
+		ante.NewSigVerificationDecorator(ak),
+		ante.NewIncrementSequenceDecorator(ak), // innermost AnteDecorator
+	)
+}