diff --git a/app/ante/ante.go b/app/ante/ante.go
index a8d67c9..75f25cd 100644
--- a/app/ante/ante.go
+++ b/app/ante/ante.go
@@ -20,6 +20,7 @@ type HandlerOptions struct {
 	SigGasConsumer         func(meter sdk.GasMeter, sig signing.SignatureV2, params authtypes.Params) error
 	TxFeeChecker           TxFeeChecker
 	MachineKeeper          MachineKeeper
+	DaoKeeper              DaoKeeper
 }
 
 // NewAnteHandler returns an AnteHandler that checks and increments sequence
@@ -41,6 +42,9 @@ func NewAnteHandler(options HandlerOptions) (sdk.AnteHandler, error) {
 	if options.MachineKeeper == nil {
 		return nil, errorsmod.Wrap(sdkerrors.ErrLogic, "machine keeper is required for ante builder")
 	}
+	if options.DaoKeeper == nil {
+		return nil, errorsmod.Wrap(sdkerrors.ErrLogic, "dao keeper is required for ante builder")
+	}
 
 	anteDecorators := []sdk.AnteDecorator{
 		ante.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first
@@ -49,7 +53,7 @@ func NewAnteHandler(options HandlerOptions) (sdk.AnteHandler, error) {
 		ante.NewTxTimeoutHeightDecorator(),
 		ante.NewValidateMemoDecorator(options.AccountKeeper),
 		NewCheckMachineDecorator(options.MachineKeeper),
-		NewCheckMintAddressDecorator(),
+		NewCheckMintAddressDecorator(options.DaoKeeper),
 		ante.NewConsumeGasForTxSizeDecorator(options.AccountKeeper),
 		NewDeductFeeDecorator(options.AccountKeeper, options.BankKeeper, options.FeegrantKeeper, options.TxFeeChecker),
 		ante.NewSetPubKeyDecorator(options.AccountKeeper), // SetPubKeyDecorator must be called before all signature verification decorators
diff --git a/app/ante/check_mint_address_decorator.go b/app/ante/check_mint_address_decorator.go
index 2e2a90f..8e273f4 100644
--- a/app/ante/check_mint_address_decorator.go
+++ b/app/ante/check_mint_address_decorator.go
@@ -8,11 +8,13 @@ import (
 )
 
 type CheckMintAddressDecorator struct {
-	MintAddress string
+	dk DaoKeeper
 }
 
-func NewCheckMintAddressDecorator() CheckMintAddressDecorator {
-	return CheckMintAddressDecorator{}
+func NewCheckMintAddressDecorator(dk DaoKeeper) CheckMintAddressDecorator {
+	return CheckMintAddressDecorator{
+		dk: dk,
+	}
 }
 
 func (cmad CheckMintAddressDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
@@ -22,7 +24,11 @@ func (cmad CheckMintAddressDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, sim
 			if ok {
 				cfg := config.GetConfig()
 				if mintMsg.Creator != cfg.MintAddress {
-					return ctx, errorsmod.Wrapf(daotypes.ErrInvalidMintAddress, "expected: %s; got: %s", cmad.MintAddress, mintMsg.Creator)
+					return ctx, errorsmod.Wrapf(daotypes.ErrInvalidMintAddress, "expected: %s; got: %s", cfg.MintAddress, mintMsg.Creator)
+				}
+				_, found := cmad.dk.GetMintRequestByHash(ctx, mintMsg.GetMintRequest().GetLiquidTxHash())
+				if found {
+					return ctx, errorsmod.Wrapf(daotypes.ErrAlreadyMinted, "liquid tx hash %s has already been minted", mintMsg.GetMintRequest().GetLiquidTxHash())
 				}
 			}
 		}
diff --git a/app/ante/expected_keepers.go b/app/ante/expected_keepers.go
index da8e415..5c2a2ad 100644
--- a/app/ante/expected_keepers.go
+++ b/app/ante/expected_keepers.go
@@ -5,6 +5,7 @@ import (
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
+	daotypes "github.com/planetmint/planetmint-go/x/dao/types"
 )
 
 type MachineKeeper interface {
@@ -32,3 +33,7 @@ type BankKeeper interface {
 	SendCoins(ctx sdk.Context, from, to sdk.AccAddress, amt sdk.Coins) error
 	SendCoinsFromAccountToModule(ctx sdk.Context, senderAddr sdk.AccAddress, recipientModule string, amt sdk.Coins) error
 }
+
+type DaoKeeper interface {
+	GetMintRequestByHash(ctx sdk.Context, hash string) (val daotypes.MintRequest, found bool)
+}
diff --git a/app/app.go b/app/app.go
index 23e3b77..2abc4d0 100644
--- a/app/app.go
+++ b/app/app.go
@@ -775,6 +775,7 @@ func New(
 			FeegrantKeeper:  app.FeeGrantKeeper,
 			SigGasConsumer:  ante.DefaultSigVerificationGasConsumer,
 			MachineKeeper:   app.MachineKeeper,
+			DaoKeeper:       app.DaoKeeper,
 		},
 	)
 	if err != nil {