diff --git a/v2/refs/grpc/marshal.go b/v2/refs/grpc/marshal.go
deleted file mode 100644
index 3503a44..0000000
--- a/v2/refs/grpc/marshal.go
+++ /dev/null
@@ -1,49 +0,0 @@
-package refs
-
-import (
-	"encoding/binary"
-	"math/bits"
-)
-
-func (m *OwnerID) StableMarshal(buf []byte) ([]byte, error) {
-	if m == nil {
-		return []byte{}, nil
-	}
-
-	if buf == nil {
-		buf = make([]byte, m.StableSize())
-	}
-
-	var (
-		i, n, offset int
-	)
-
-	// Write key field.
-
-	buf[i] = 0x0A // id:0x1 << 3 | wiretype:0x2
-	offset = binary.PutUvarint(buf[i+1:], uint64(len(m.Value)))
-	n = copy(buf[i+1+offset:], m.Value)
-	i += 1 + offset + n
-
-	return buf, nil
-}
-
-func (m *OwnerID) StableSize() int {
-	if m == nil {
-		return 0
-	}
-
-	var (
-		ln, size int
-	)
-
-	ln = len(m.Value)                        // size of key field
-	size += 1 + uvarIntSize(uint64(ln)) + ln // wiretype + size of string + string
-
-	return size
-}
-
-// uvarIntSize returns length of varint byte sequence for uint64 value 'x'.
-func uvarIntSize(x uint64) int {
-	return (bits.Len64(x|1) + 6) / 7
-}
diff --git a/v2/refs/grpc/marshal_test.go b/v2/refs/grpc/marshal_test.go
deleted file mode 100644
index 8f822fb..0000000
--- a/v2/refs/grpc/marshal_test.go
+++ /dev/null
@@ -1,45 +0,0 @@
-package refs
-
-import (
-	"crypto/rand"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-func TestOwnerID_StableMarshal(t *testing.T) {
-	owner := make([]byte, 25)
-	_, err := rand.Read(owner)
-	require.NoError(t, err)
-
-	expectedOwner := new(OwnerID)
-	expectedOwner.Value = owner
-
-	gotOwner := new(OwnerID)
-
-	t.Run("small buffer", func(t *testing.T) {
-		require.Panics(t, func() {
-			expectedOwner.StableMarshal(make([]byte, 1))
-		})
-	})
-
-	t.Run("empty owner", func(t *testing.T) {
-		data, err := new(OwnerID).StableMarshal(nil)
-		require.NoError(t, err)
-
-		err = gotOwner.Unmarshal(data)
-		require.NoError(t, err)
-
-		require.Len(t, gotOwner.Value, 0)
-	})
-
-	t.Run("non empty owner", func(t *testing.T) {
-		data, err := expectedOwner.StableMarshal(nil)
-		require.NoError(t, err)
-
-		err = gotOwner.Unmarshal(data)
-		require.NoError(t, err)
-
-		require.Equal(t, expectedOwner, gotOwner)
-	})
-}