diff --git a/capabilities/audio/audio.transcribe-speech/1.1.0/signature.json b/capabilities/audio/audio.transcribe-speech/1.1.0/signature.json
new file mode 100644
index 00000000..b8c78919
--- /dev/null
+++ b/capabilities/audio/audio.transcribe-speech/1.1.0/signature.json
@@ -0,0 +1,7 @@
+{
+  "scheme": "ed25519",
+  "public_key_hex": "39d1745be4d54e30be1180454661e5d8826075692d86b86fb042d19d96cb8522",
+  "signature_hex": "726a0c974339c44d491d29b13ec337397ef9a9204390235c06a8ccd08394d8249987e08d497492138b582e5f3c87bb7b0c09ded2654b960905c34346d32fb40e",
+  "sigstore_bundle_ref": null,
+  "signed_at": "2026-09-12T02:03:08Z"
+}