diff --git a/types/denom.go b/types/denom.go
index bbbec74..a56838a 100644
--- a/types/denom.go
+++ b/types/denom.go
@@ -1,10 +1,7 @@
 package types
 
 import (
-	"strings"
-
 	sdk "github.com/cosmos/cosmos-sdk/types"
-	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 )
 
 func NewDenom(id, symbol, name, schema string, creator sdk.AccAddress, description, previewURI string) Denom {
@@ -18,55 +15,3 @@ func NewDenom(id, symbol, name, schema string, creator sdk.AccAddress, descripti
 		PreviewURI:  previewURI,
 	}
 }
-
-func ValidateDenomID(denomID string) error {
-	denomID = strings.TrimSpace(denomID)
-	if len(denomID) < MinIDLen || len(denomID) > MaxIDLen {
-		return sdkerrors.Wrapf(ErrInvalidDenom, "invalid denom ID %s, length  must be between [%d, %d]", denomID, MinIDLen, MaxIDLen)
-	}
-	if !IsBeginWithAlpha(denomID) || !IsAlphaNumeric(denomID) {
-		return sdkerrors.Wrapf(ErrInvalidDenom, "invalid denom ID %s, only accepts alphanumeric characters,and begin with an english letter", denomID)
-	}
-	return nil
-}
-func ValidateDenomSymbol(denomSymbol string) error {
-	denomSymbol = strings.TrimSpace(denomSymbol)
-	if len(denomSymbol) < MinDenomLen || len(denomSymbol) > MaxDenomLen {
-		return sdkerrors.Wrapf(ErrInvalidDenom, "invalid denom symbol %s, only accepts value [%d, %d]", denomSymbol, MinDenomLen, MaxDenomLen)
-	}
-	if !IsBeginWithAlpha(denomSymbol) || !IsAlpha(denomSymbol) {
-		return sdkerrors.Wrapf(ErrInvalidDenom, "invalid denom symbol %s, only accepts alphabetic characters", denomSymbol)
-	}
-	return nil
-}
-
-func ValidateName(name string) error {
-	name = strings.TrimSpace(name)
-	if len(name) > MaxNameLen {
-		return sdkerrors.Wrapf(ErrInvalidName, "invalid name %s, length must be less than %d", name, MaxNameLen)
-	}
-	return nil
-}
-
-func ValidateDescription(description string) error {
-	description = strings.TrimSpace(description)
-	if len(description) > MaxDescriptionLen {
-		return sdkerrors.Wrapf(ErrInvalidDescription, "invalid description %s, length must be less than %d", description, MaxDescriptionLen)
-	}
-	return nil
-}
-
-func ValidateURI(uri string) error {
-	uri = strings.TrimSpace(uri)
-	if len(uri) > MaxURILen {
-		return sdkerrors.Wrapf(ErrInvalidURI, "invalid uri %s, length must be less than %d", uri, MaxURILen)
-	}
-	return nil
-}
-
-func ValidateCreationFee(fee sdk.Coin) error {
-	if !fee.IsValid() || fee.IsNil() {
-		return sdkerrors.Wrapf(ErrInvalidURI, "invalid creation fee %s, fee must be positive", fee.String())
-	}
-	return nil
-}
diff --git a/types/msgs.go b/types/msgs.go
index 8f51bd6..67a593d 100644
--- a/types/msgs.go
+++ b/types/msgs.go
@@ -221,7 +221,7 @@ func (msg MsgMintONFT) ValidateBasic() error {
 	if err := ValidateDescription(msg.Metadata.Description); err != nil {
 		return err
 	}
-	if err := ValidateURI(msg.Metadata.MediaURI); err != nil {
+	if err := ValidateMediaURI(msg.Metadata.MediaURI); err != nil {
 		return err
 	}
 	if err := ValidateURI(msg.Metadata.PreviewURI); err != nil {
diff --git a/types/onft.go b/types/onft.go
index 775efc7..4e72e82 100644
--- a/types/onft.go
+++ b/types/onft.go
@@ -1,13 +1,10 @@
 package types
 
 import (
-	"strings"
 	"time"
 
-	sdk "github.com/cosmos/cosmos-sdk/types"
-	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
-
 	"github.com/OmniFlix/onft/exported"
+	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
 var _ exported.ONFT = ONFT{}
@@ -86,18 +83,3 @@ func NewONFTs(onfts ...exported.ONFT) ONFTs {
 	}
 	return onfts
 }
-
-func ValidateONFTID(onftId string) error {
-	onftId = strings.TrimSpace(onftId)
-	if len(onftId) < MinIDLen || len(onftId) > MaxIDLen {
-		return sdkerrors.Wrapf(
-			ErrInvalidONFTID,
-			"invalid onftId %s, length must be between [%d, %d]", onftId, MinIDLen, MaxIDLen)
-	}
-	if !IsBeginWithAlpha(onftId) || !IsAlphaNumeric(onftId) {
-		return sdkerrors.Wrapf(
-			ErrInvalidONFTID,
-			"invalid onftId %s, only accepts alphanumeric characters and begin with an english letter", onftId)
-	}
-	return nil
-}
diff --git a/types/validations.go b/types/validations.go
new file mode 100644
index 0000000..92f9fc7
--- /dev/null
+++ b/types/validations.go
@@ -0,0 +1,122 @@
+package types
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+)
+
+func ValidateONFTID(onftId string) error {
+	if len(onftId) < MinIDLen || len(onftId) > MaxIDLen {
+		return sdkerrors.Wrapf(
+			ErrInvalidONFTID,
+			"invalid onftId %s, length must be between [%d, %d]", onftId, MinIDLen, MaxIDLen)
+	}
+	if !IsBeginWithAlpha(onftId) || !IsAlphaNumeric(onftId) {
+		return sdkerrors.Wrapf(
+			ErrInvalidONFTID,
+			"invalid onftId %s, only accepts alphanumeric characters and begin with an english letter", onftId)
+	}
+	return nil
+}
+
+func ValidateDenomID(denomID string) error {
+	if len(denomID) < MinIDLen || len(denomID) > MaxIDLen {
+		return sdkerrors.Wrapf(
+			ErrInvalidDenom,
+			"invalid denom ID %s, length  must be between [%d, %d]",
+			denomID,
+			MinIDLen,
+			MaxIDLen,
+		)
+	}
+	if !IsBeginWithAlpha(denomID) || !IsAlphaNumeric(denomID) {
+		return sdkerrors.Wrapf(
+			ErrInvalidDenom,
+			"invalid denom ID %s, only accepts alphanumeric characters,and begin with an english letter",
+			denomID,
+		)
+	}
+	return nil
+}
+func ValidateDenomSymbol(denomSymbol string) error {
+	if len(denomSymbol) < MinDenomLen || len(denomSymbol) > MaxDenomLen {
+		return sdkerrors.Wrapf(
+			ErrInvalidDenom,
+			"invalid denom symbol %s, only accepts value [%d, %d]",
+			denomSymbol,
+			MinDenomLen,
+			MaxDenomLen,
+		)
+	}
+	if !IsBeginWithAlpha(denomSymbol) || !IsAlpha(denomSymbol) {
+		return sdkerrors.Wrapf(
+			ErrInvalidDenom,
+			"invalid denom symbol %s, only accepts alphabetic characters",
+			denomSymbol,
+		)
+	}
+	return nil
+}
+
+func ValidateName(name string) error {
+	if len(name) > MaxNameLen {
+		return sdkerrors.Wrapf(
+			ErrInvalidName,
+			"invalid name %s, length must be less than %d",
+			name,
+			MaxNameLen,
+		)
+	}
+	return nil
+}
+
+func ValidateDescription(description string) error {
+	if len(description) > MaxDescriptionLen {
+		return sdkerrors.Wrapf(
+			ErrInvalidDescription,
+			"invalid description %s, length must be less than %d",
+			description,
+			MaxDescriptionLen,
+		)
+	}
+	return nil
+}
+
+func ValidateURI(uri string) error {
+	if len(uri) > MaxURILen {
+		return sdkerrors.Wrapf(
+			ErrInvalidURI,
+			"invalid uri %s, length must be less than %d",
+			uri,
+			MaxURILen,
+		)
+	}
+	return nil
+}
+
+func ValidateMediaURI(uri string) error {
+	if len(uri) == 0 {
+		return sdkerrors.Wrapf(
+			ErrInvalidURI,
+			"invalid uri %s, media uri should not be empty",
+			uri,
+			0,
+		)
+	}
+	if len(uri) > MaxURILen {
+		return sdkerrors.Wrapf(
+			ErrInvalidURI,
+			"invalid uri %s, length must be less than %d",
+			uri,
+			MaxURILen,
+		)
+	}
+	return nil
+}
+
+func ValidateCreationFee(fee sdk.Coin) error {
+	if !fee.IsValid() || fee.IsNil() {
+		return sdkerrors.Wrapf(ErrInvalidURI, "invalid creation fee %s, fee must be positive", fee.String())
+	}
+	return nil
+}