diff --git a/service/v2/signature.go b/service/v2/signature.go
new file mode 100644
index 0000000..5470bea
--- /dev/null
+++ b/service/v2/signature.go
@@ -0,0 +1,17 @@
+package v2
+
+func (m *RequestMetaHeader) ReadSignedData(buf []byte) ([]byte, error) {
+	return m.StableMarshal(buf)
+}
+
+func (m *RequestMetaHeader) SignedDataSize() int {
+	return m.StableSize()
+}
+
+func (m *RequestVerificationHeader) ReadSignedData(buf []byte) ([]byte, error) {
+	return m.StableMarshal(buf)
+}
+
+func (m *RequestVerificationHeader) SignedDataSize() int {
+	return m.StableSize()
+}