diff --git a/pubsub.go b/pubsub.go
index 0292ab9..e44c467 100644
--- a/pubsub.go
+++ b/pubsub.go
@@ -496,6 +496,12 @@ func (p *PubSub) validate(vals []*topicVal, src peer.ID, msg *Message) {
 }
 
 func (p *PubSub) validateSignature(msg *Message) bool {
+	err := verifyMessageSignature(msg.Message)
+	if err != nil {
+		log.Debugf("signature verification error: %s", err.Error())
+		return false
+	}
+
 	return true
 }
 
diff --git a/sign.go b/sign.go
new file mode 100644
index 0000000..14eb2cc
--- /dev/null
+++ b/sign.go
@@ -0,0 +1,13 @@
+package floodsub
+
+import (
+	pb "github.com/libp2p/go-floodsub/pb"
+)
+
+func verifyMessageSignature(m *pb.Message) error {
+	return nil
+}
+
+func signMessage(m *pb.Message) {
+
+}