diff --git a/sdk/core/nodetypes/transaction.go b/sdk/core/nodetypes/transaction.go
index 1b942d0..d9a0946 100644
--- a/sdk/core/nodetypes/transaction.go
+++ b/sdk/core/nodetypes/transaction.go
@@ -30,21 +30,6 @@ type Transaction struct {
 	Signature            [64]byte
 }
 
-func (tx *Transaction) GetUnsignedDigest() ([32]byte, error) {
-	serialized, err := tx.MarshallBinary()
-	if err != nil {
-		return [32]byte{}, errors.Wrap(err, "marshalling tx data")
-	}
-
-	// create digest with data without signature
-	digest, err := common.K12Hash(serialized[:len(serialized)-64])
-	if err != nil {
-		return [32]byte{}, errors.Wrap(err, "hashing tx data")
-	}
-
-	return digest, nil
-}
-
 func (tx *Transaction) MarshallBinary() ([]byte, error) {
 	var buff bytes.Buffer
 	_, err := buff.Write(tx.SourcePublicKey[:])
@@ -89,6 +74,21 @@ func (tx *Transaction) MarshallBinary() ([]byte, error) {
 	return buff.Bytes(), nil
 }
 
+func (tx *Transaction) GetUnsignedDigest() ([32]byte, error) {
+	serialized, err := tx.MarshallBinary()
+	if err != nil {
+		return [32]byte{}, errors.Wrap(err, "marshalling tx data")
+	}
+
+	// create digest with data without signature
+	digest, err := common.K12Hash(serialized[:len(serialized)-64])
+	if err != nil {
+		return [32]byte{}, errors.Wrap(err, "hashing tx data")
+	}
+
+	return digest, nil
+}
+
 func (tx *Transaction) UnmarshallFromReader(r io.Reader) error {
 	err := binary.Read(r, binary.LittleEndian, &tx.SourcePublicKey)
 	if err != nil {
diff --git a/sdk/qx/client.go b/sdk/qx/client.go
index f048f69..f94b1c0 100644
--- a/sdk/qx/client.go
+++ b/sdk/qx/client.go
@@ -59,10 +59,14 @@ func (c *Client) GetAssetBidOrders(ctx context.Context, name string, issuerID st
 }
 
 func (c *Client) getAssetOrders(ctx context.Context, assetOrderType uint16, name string, issuerID string, offset uint64) (*qubicpb.AssetOrders, error) {
-	id := common.Identity(issuerID)
-	issuerPubKey, err := id.ToPubKey(false)
-	if err != nil {
-		return nil, errors.Wrap(err, "converting issuer id to pubkey")
+	var idPubkey [32]byte
+	if issuerID != "" {
+		id := common.Identity(issuerID)
+		issuerPubKey, err := id.ToPubKey(false)
+		if err != nil {
+			return nil, errors.Wrap(err, "converting issuer id to pubkey")
+		}
+		idPubkey = issuerPubKey
 	}
 
 	var assetName [8]byte
@@ -73,7 +77,7 @@ func (c *Client) getAssetOrders(ctx context.Context, assetOrderType uint16, name
 		AssetName    uint64
 		Offset       uint64
 	}{
-		IssuerPubKey: issuerPubKey,
+		IssuerPubKey: idPubkey,
 		AssetName:    binary.LittleEndian.Uint64(assetName[:]),
 		Offset:       offset,
 	}
@@ -87,7 +91,7 @@ func (c *Client) getAssetOrders(ctx context.Context, assetOrderType uint16, name
 	}
 
 	var result AssetOrders
-	err = c.connector.PerformSmartContractRequest(ctx, rcf, request, &result)
+	err := c.connector.PerformSmartContractRequest(ctx, rcf, request, &result)
 	if err != nil {
 		return nil, errors.Wrap(err, "performing smart contract request")
 	}