diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8b76d74..5784f21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.0.0
+
+- Add SignatureValidationException
+
 ## 3.0.0
 
 - Deploy to Google Cloud workflow
diff --git a/lib/src/impl/blockfrost_webhook_handler.dart b/lib/src/impl/blockfrost_webhook_handler.dart
index f10ae51..b07de0c 100644
--- a/lib/src/impl/blockfrost_webhook_handler.dart
+++ b/lib/src/impl/blockfrost_webhook_handler.dart
@@ -28,13 +28,21 @@ class BlockfrostWebhookHandler implements WebhookHandler {
     }
 
     // Validate signature
-    if (!validator.validate(
-      signatureHeader: signatureHeader,
-      requestPayload: requestPayload,
-      secretAuthToken: secretToken,
-    )) {
-      return Response(400, body: 'Signature validation failed!');
+    try {
+      validator.validate(
+          requestPayload: requestPayload,
+          signatureHeader: signatureHeader,
+          secretAuthToken: secretToken);
+    } on SignatureValidationException catch (e) {
+      return Response(
+        400,
+        // Or whatever single status code you prefer for all validation failures
+        body: 'Signature validation failed! ${e.toString()}',
+      );
+    } catch (e) {
+      return Response.internalServerError(body: 'Signature validation failed!');
     }
+
     // Process payload
     try {
       processor.process(requestPayload);
diff --git a/pubspec.lock b/pubspec.lock
index 0e2685d..ef3124f 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -38,7 +38,7 @@ packages:
     description:
       path: "."
       ref: "feature/blockfrost_secure_webhooks"
-      resolved-ref: d0af10d45c0158656da5798ee4d7e5cc26254ada
+      resolved-ref: eb1f853fbd56ea4f67bff2e47f3f48d911c8f7a9
       url: "https://github.com/andro-devs/blockfrost-dart.git"
     source: git
     version: "1.0.0"
diff --git a/test/blockfrost_webhook_handler_test.dart b/test/blockfrost_webhook_handler_test.dart
index d9407ec..ccab3f2 100644
--- a/test/blockfrost_webhook_handler_test.dart
+++ b/test/blockfrost_webhook_handler_test.dart
@@ -54,6 +54,25 @@ void main() {
         )).thenReturn(value);
   }
 
+  // Define the common stubbing logic
+  void stubValidatorToThrowSignatureValidationException() {
+    when(() => mockValidator.validate(
+              signatureHeader: any(named: 'signatureHeader'),
+              requestPayload: any(named: 'requestPayload'),
+              secretAuthToken: testSecret,
+            ))
+        .thenThrow(
+            SignatureValidationException('Invalid', header: "", payload: ""));
+  }
+
+  void stubValidatorToThrowException() {
+    when(() => mockValidator.validate(
+          signatureHeader: any(named: 'signatureHeader'),
+          requestPayload: any(named: 'requestPayload'),
+          secretAuthToken: testSecret,
+        )).thenThrow(Exception());
+  }
+
   // Define the common stubbing logic
   void stubProcessorToThrowException() {
     when(() => mockProcessor.process(any())).thenThrow(Exception());
@@ -95,21 +114,58 @@ void main() {
     // --- Test Case 2: Validation Failure ---
     test('Should return 400 when validation fails (Rejection scenario)',
         () async {
-      // STUB: Inject a validator that ALWAYS returns FALSE (simulates invalid signature)
-      stubValidatorToReturn(false);
+      // Use the revised stub that throws a concrete exception
+      stubValidatorToThrowSignatureValidationException();
 
       final request = createMockRequest(
         body: testBodyBlock,
         headers: {'blockfrost-signature': validSignatureHeader},
       );
 
+      // Call the handler, which will catch the thrown exception and return a Response
       final response = await handler.handleWebhook(
-          request: request,
-          secretToken: testSecret,
-          validator: mockValidator,
-          processor: mockProcessor);
+        request: request,
+        secretToken: testSecret,
+        validator: mockValidator,
+        processor: mockProcessor,
+      );
       expect(response.statusCode, 400);
-      expect(await response.readAsString(), 'Signature validation failed!');
+      final responseBody = await response.readAsString();
+      expect(responseBody, startsWith('Signature validation failed!'));
+      expect(responseBody, contains('SignatureValidationException: Invalid'));
+      expect(responseBody, contains('Header:'));
+      expect(responseBody, contains('Payload:'));
+
+      // Verify that the validator was called once
+      verify(() => mockValidator.validate(
+            signatureHeader: validSignatureHeader,
+            requestPayload: testBodyBlock,
+            secretAuthToken: testSecret,
+          )).called(1);
+
+      // Verify that the processor was never reached
+      verifyZeroInteractions(mockProcessor);
+    });
+
+    // --- Test Case 3: Validation Failure ---
+    test('Should return 500 when validation fails with internal error',
+        () async {
+      // Use the revised stub that throws a concrete exception
+      stubValidatorToThrowException();
+
+      final request = createMockRequest(
+        body: testBodyBlock,
+        headers: {'blockfrost-signature': validSignatureHeader},
+      );
+
+      // Call the handler, which will catch the thrown exception and return a Response
+      final response = await handler.handleWebhook(
+        request: request,
+        secretToken: testSecret,
+        validator: mockValidator,
+        processor: mockProcessor,
+      );
+      expect(response.statusCode, 500);
 
       // Verify the mock was called to ensure we tested the correct path
       verify(() => mockValidator.validate(
@@ -122,7 +178,7 @@ void main() {
       verifyZeroInteractions(mockProcessor);
     });
 
-    // --- Test Case 3: Empty payload ---
+    // --- Test Case 4: Empty payload ---
     test('Should return 400 if the payload is empty', () async {
       // STUB: Inject a validator that ALWAYS returns TRUE (simulates valid signature)
       stubValidatorToReturn(true);
@@ -141,7 +197,7 @@ void main() {
       verifyZeroInteractions(mockProcessor);
     });
 
-    // --- Test Case 4: Successful Reception of an transaction webhook ---
+    // --- Test Case 5: Successful Reception of an transaction webhook ---
     test('Should return 200 when validation succeeds and type is transaction',
         () async {
       stubValidatorToReturn(
@@ -164,7 +220,7 @@ void main() {
       verify(() => mockProcessor.process(testBodyTx)).called(1);
     });
 
-    // --- Test Case 5: Successful Reception of an transaction webhook ---
+    // --- Test Case 6: Successful Reception of an transaction webhook ---
     test('Should return 200 when validation succeeds and type is transaction',
         () async {
       // STUB: Inject a validator that ALWAYS returns TRUE (simulates valid signature)
@@ -187,7 +243,7 @@ void main() {
       verify(() => mockProcessor.process(testBodyBlock)).called(1);
     });
 
-    // --- Test Case 6: Invalid JSON After Validation ---
+    // --- Test Case 7: Invalid JSON After Validation ---
     test('Should return 500 if the validated payload is not valid JSON',
         () async {
       stubProcessorToThrowException();