diff --git a/x/did/types/types.go b/x/did/types/types.go
new file mode 100644
index 000000000..777f908ff
--- /dev/null
+++ b/x/did/types/types.go
@@ -0,0 +1,15 @@
+package types
+
+func (a *AssetInfo) Equal(b *AssetInfo) bool {
+	if a == nil && b == nil {
+		return true
+	}
+	return false
+}
+
+func (c *ChainInfo) Equal(b *ChainInfo) bool {
+	if c == nil && b == nil {
+		return true
+	}
+	return false
+}