diff --git a/testutil/sample/sample.go b/testutil/sample/sample.go
index 7d55522..eb211c7 100644
--- a/testutil/sample/sample.go
+++ b/testutil/sample/sample.go
@@ -5,14 +5,13 @@ import (
 	machinetypes "planetmint-go/x/machine/types"
 
 	"github.com/cosmos/cosmos-sdk/crypto/keys/ed25519"
-	"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
 // KeyPair returns a sample private / public keypair
 func KeyPair() (string, string) {
 	secret := "Don't tell anybody"
-	sk := secp256k1.GenPrivKeyFromSecret([]byte(secret))
+	sk := ed25519.GenPrivKeyFromSecret([]byte(secret))
 	pk := sk.PubKey()
 	return hex.EncodeToString(sk.Bytes()), hex.EncodeToString(pk.Bytes())
 }
diff --git a/x/asset/keeper/msg_server_notarize_asset.go b/x/asset/keeper/msg_server_notarize_asset.go
index 4ae2282..f086bb7 100644
--- a/x/asset/keeper/msg_server_notarize_asset.go
+++ b/x/asset/keeper/msg_server_notarize_asset.go
@@ -8,7 +8,7 @@ import (
 
 	"planetmint-go/x/asset/types"
 
-	"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
+	"github.com/cosmos/cosmos-sdk/crypto/keys/ed25519"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -47,7 +47,7 @@ func ValidateSignature(message string, signature string, publicKey string) bool
 	hash := sha256.Sum256(messageBytes)
 
 	// Create a secp256k1 public key object
-	pubKey := &secp256k1.PubKey{Key: publicKeyBytes}
+	pubKey := &ed25519.PubKey{Key: publicKeyBytes}
 
 	// Verify the signature
 	isValid := pubKey.VerifySignature(hash[:], signatureBytes)
diff --git a/x/asset/keeper/msg_server_test.go b/x/asset/keeper/msg_server_test.go
index a1eeede..63a805f 100644
--- a/x/asset/keeper/msg_server_test.go
+++ b/x/asset/keeper/msg_server_test.go
@@ -11,7 +11,7 @@ import (
 	"planetmint-go/x/asset/keeper"
 	"planetmint-go/x/asset/types"
 
-	"github.com/cosmos/cosmos-sdk/crypto/keys/secp256k1"
+	"github.com/cosmos/cosmos-sdk/crypto/keys/ed25519"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/stretchr/testify/assert"
 )
@@ -29,7 +29,7 @@ func TestMsgServerNotarizeAsset(t *testing.T) {
 	if err != nil {
 		assert.Equal(t, true, false)
 	}
-	privKey := &secp256k1.PrivKey{Key: skBytes}
+	privKey := &ed25519.PrivKey{Key: skBytes}
 
 	cidBytes, _ := hex.DecodeString(cid)
 	hash := sha256.Sum256(cidBytes)