diff --git a/softbinding-algorithm-list.json b/softbinding-algorithm-list.json
index 207fe74..99f5a0a 100755
--- a/softbinding-algorithm-list.json
+++ b/softbinding-algorithm-list.json
@@ -771,4 +771,17 @@
             "https://api.joinmonolith.com/api/c2pa"
         ]
     }
+,
+    {
+      "identifier": 49,
+      "alg": "com.museblossom.contentsdefence.1",
+      "type": "watermark",
+      "decodedMediaTypes": ["image"],
+      "entryMetadata": {
+        "description": "Contents Defence invisible image watermark, used to recover the associated C2PA manifest when embedded metadata is absent.",
+        "dateEntered": "2026-08-10T00:00:00.000Z",
+        "contact": "contact@museblossom.com",
+        "informationalUrl": "https://museblossom.com/about"
+      }
+    }
 ]