diff --git a/server.go b/server.go
index 3e6910b..f453d88 100644
--- a/server.go
+++ b/server.go
@@ -215,6 +215,13 @@ func timestampTooOld(ts int32) bool {
 	return diff > 180 //3 minutes, 180 seconds
 }
 
+func timestampOldThan(ts int32, sec int32) bool {
+	//diff > 3min from now
+	now := int32(time.Now().Unix())
+	diff := now - ts
+	return diff > sec
+}
+
 // func checkSignature1() bool {
 // 	s1 := "e39de9f2e28079c01ebb4b803dfc3442b819545c"
 // 	t1 := "1492970761"