diff --git a/models/common.go b/models/common.go
index d456e4c..0480e3a 100644
--- a/models/common.go
+++ b/models/common.go
@@ -10,7 +10,7 @@ type SuiAddress string
 type SuiAddressBytes [32]byte
 type TransactionDigest string
 type ObjectDigest string
-type ObjectDigestBytes [32]byte
+type ObjectDigestBytes []byte
 
 func init() {
 	var suiAddressBytes SuiAddressBytes
@@ -29,6 +29,10 @@ func (s SuiAddressBytes) IsEqual(other SuiAddressBytes) bool {
 }
 
 func (o ObjectDigestBytes) IsEqual(other ObjectDigestBytes) bool {
+	if len(o) != len(other) {
+		return false
+	}
+
 	for i, b := range o {
 		if b != other[i] {
 			return false
diff --git a/mystenbcs/decode.go b/mystenbcs/decode.go
index 9d00b78..b598035 100644
--- a/mystenbcs/decode.go
+++ b/mystenbcs/decode.go
@@ -70,7 +70,7 @@ func (d *Decoder) decode(v reflect.Value) (int, error) {
 		switch v.Kind() {
 		case reflect.Pointer, reflect.Interface:
 			if v.IsNil() {
-				return 0, fmt.Errorf("trying to decode into nil pointer/interface")
+				v.Set(reflect.New(v.Type().Elem()))
 			}
 			return d.decodeEnum(v.Elem())
 		default:
@@ -143,6 +143,10 @@ func (d *Decoder) decodeVanilla(v reflect.Value) (int, error) {
 		return d.decodeSlice(v)
 
 	case reflect.Array:
+		arrayType := v.Type().Elem()
+		if arrayType.Kind() == reflect.Uint8 {
+			return d.decodeByteArray(v)
+		}
 		return d.decodeArray(v)
 
 	case reflect.String:
@@ -222,7 +226,7 @@ fieldLoop:
 				return n, err
 			}
 			if isOptional == 0 {
-				field.Set(reflect.Zero(v.Type()))
+				field.Set(reflect.Zero(field.Type()))
 			} else {
 				field.Set(reflect.New(field.Type().Elem()))
 				k, err := d.decode(field.Elem())
@@ -287,6 +291,31 @@ func (d *Decoder) decodeByteSlice(v reflect.Value) (int, error) {
 	return n, nil
 }
 
+func (d *Decoder) decodeByteArray(v reflect.Value) (int, error) {
+	arraySize := v.Len()
+
+	if arraySize == 0 {
+		return 0, nil
+	}
+
+	tmp := make([]byte, arraySize)
+
+	read, err := d.reader.Read(tmp)
+	if err != nil {
+		return read, err
+	}
+
+	if arraySize != read {
+		return read, fmt.Errorf("wrong number of bytes read for [%d]byte, want: %d, got %d", arraySize, arraySize, read)
+	}
+
+	for i := 0; i < arraySize; i++ {
+		v.Index(i).SetUint(uint64(tmp[i]))
+	}
+
+	return read, nil
+}
+
 func (d *Decoder) decodeArray(v reflect.Value) (int, error) {
 	size := v.Len()
 	t := v.Type()
@@ -333,7 +362,7 @@ func (d *Decoder) decodeSlice(v reflect.Value) (int, error) {
 	if elementType.Kind() == reflect.Pointer {
 		for i := 0; i < size; i++ {
 			ind := reflect.New(elementType.Elem())
-			k, err := d.decode(ind.Elem())
+			k, err := d.decode(ind)
 			n += k
 			if err != nil {
 				return n, err
diff --git a/transaction/convert.go b/transaction/convert.go
index 2b17033..2029661 100644
--- a/transaction/convert.go
+++ b/transaction/convert.go
@@ -37,12 +37,9 @@ func ConvertObjectDigestStringToBytes(digest models.ObjectDigest) (*models.Objec
 		return nil, ErrInvalidObjectId
 	}
 
-	var fixedBytes [32]byte
-	copy(fixedBytes[:], decoded)
-
-	return (*models.ObjectDigestBytes)(&fixedBytes), nil
+	return (*models.ObjectDigestBytes)(&decoded), nil
 }
 
 func ConvertObjectDigestBytesToString(digest models.ObjectDigestBytes) models.ObjectDigest {
-	return models.ObjectDigest(base58.Encode(digest[:]))
+	return models.ObjectDigest(base58.Encode(digest))
 }
diff --git a/transaction/transaction_data_test.go b/transaction/transaction_data_test.go
new file mode 100644
index 0000000..cfc19d1
--- /dev/null
+++ b/transaction/transaction_data_test.go
@@ -0,0 +1,23 @@
+package transaction
+
+import (
+	"encoding/base64"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/block-vision/sui-go-sdk/mystenbcs"
+)
+
+func TestBcsUnmarshal(t *testing.T) {
+	b64Tx := "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"
+	txBz, _ := base64.StdEncoding.DecodeString(b64Tx)
+
+	var txData TransactionData
+	_, err := mystenbcs.Unmarshal(txBz, &txData)
+	require.NoError(t, err)
+
+	genBz, err := txData.Marshal()
+	require.NoError(t, err)
+	require.Equal(t, txBz, genBz)
+}