diff --git a/inngest/src/handler.rs b/inngest/src/handler.rs
index 52a88af..d684780 100644
--- a/inngest/src/handler.rs
+++ b/inngest/src/handler.rs
@@ -180,7 +180,7 @@ impl<T, E> Handler<T, E> {
             };
 
             let signature = Signature::new(&sig, &key, &body);
-            if let Err(err) = signature.verify() {
+            if let Err(err) = signature.verify(false) {
                 return Err(err);
             }
         }
diff --git a/inngest/src/signature.rs b/inngest/src/signature.rs
index 6ef1dcb..9ed0c8b 100644
--- a/inngest/src/signature.rs
+++ b/inngest/src/signature.rs
@@ -17,8 +17,94 @@ impl Signature {
         }
     }
 
+    fn hash(key: &str) -> String {
+        "".to_string()
+    }
+
     // TODO: implement signature validation
-    pub fn verify(&self) -> Result<(), Error> {
+    pub fn verify(&self, ignore_ts: bool) -> Result<(), Error> {
         Ok(())
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use serde_json::json;
+
+    const SIGNING_KEY: &str =
+        "signkey-test-8ee2262a15e8d3c42d6a840db7af3de2aab08ef632b32a37a687f24b34dba3ff";
+    const HASHED_SIGNING_KEY: &str =
+        "signkey-test-e4bf4a2e7f55c7eb954b6e72f8f69628fbc409fe7da6d0f6958770987dcf0e02";
+    const SIGNATURE: &str =
+        "t=1689920619&s=31df77f5b1b029de4bfce3a77e0517aa4ce0f5e2195a6467fc126a489ca2330b";
+
+    #[test]
+    fn test_hashed_signing_key() {
+        let hashed = Signature::hash(SIGNING_KEY);
+        assert_eq!(hashed, HASHED_SIGNING_KEY);
+    }
+
+    fn event() -> Value {
+        json!({
+            "id": "",
+            "name": "inngest/scheduled.timer",
+            "data": {},
+            "user": {},
+            "ts": 1_674_082_830_001 as i64,
+            "v": "1"
+        })
+    }
+
+    fn body() -> Value {
+        let evt = event();
+
+        json!({
+            "ctx": {
+                "fn_id": "local-testing-local-cron",
+                "run_id": "01GQ3HTEZ01M7R8Z9PR1DMHDN1",
+                "step_id": "step"
+            },
+            "event": &evt,
+            "events": [&evt],
+            "steps": {},
+            "use_api": false
+        })
+    }
+
+    #[test]
+    fn test_verify_if_signature_is_valid() {
+        let body = body();
+        let sig = Signature::new(SIGNATURE, SIGNING_KEY, &body);
+        let res = sig.verify(true);
+        assert!(res.is_ok());
+    }
+
+    #[ignore]
+    #[test]
+    fn test_verify_if_signature_is_expired() {
+        let body = body();
+        let sig = Signature::new(SIGNATURE, SIGNING_KEY, &body);
+        let res = sig.verify(false);
+        assert!(res.is_err());
+    }
+
+    #[ignore]
+    #[test]
+    fn test_verify_if_signature_is_invalid() {
+        let body = body();
+        let invalid_sig = format!("{}hello", SIGNATURE);
+        let sig = Signature::new(&invalid_sig, SIGNING_KEY, &body);
+        let res = sig.verify(true);
+        assert!(res.is_err());
+    }
+
+    #[ignore]
+    #[test]
+    fn test_verify_for_random_input() {
+        let body = body();
+        let sig = Signature::new("10", SIGNING_KEY, &body);
+        let res = sig.verify(true);
+        assert!(res.is_err());
+    }
+}