diff --git a/signing-manifests/bug1774221-3.yml b/signing-manifests/bug1774221-3.yml
index 16e3e3d..d412f8f 100644
--- a/signing-manifests/bug1774221-3.yml
+++ b/signing-manifests/bug1774221-3.yml
@@ -1,4 +1,5 @@
 ---
+# comment to rerun dep signing
 bug: 1774221
 sha256: b36e091ad9c4b3cd315b6bee0110c706b8f54a7b2bdf9ca292c6431e19fdb6c3
 filesize: 395414
diff --git a/taskcluster/adhoc_taskgraph/routes.py b/taskcluster/adhoc_taskgraph/routes.py
index a542712..30cef32 100644
--- a/taskcluster/adhoc_taskgraph/routes.py
+++ b/taskcluster/adhoc_taskgraph/routes.py
@@ -17,9 +17,6 @@
 def add_signing_indexes(config, task, variant):
     routes = task.setdefault("routes", [])
 
-    if config.params["level"] != "3":
-        return task
-
     subs = config.params.copy()
     subs["build_date"] = time.strftime(
         "%Y.%m.%d", time.gmtime(config.params["build_date"])
diff --git a/taskcluster/adhoc_taskgraph/transforms/cached.py b/taskcluster/adhoc_taskgraph/transforms/cached.py
new file mode 100644
index 0000000..e9b092e
--- /dev/null
+++ b/taskcluster/adhoc_taskgraph/transforms/cached.py
@@ -0,0 +1,81 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Build the cached_task digest to prevent rerunning tasks if the code hasn't changed.
+"""
+
+import hashlib
+import json
+import os
+import subprocess
+
+import taskgraph
+from taskgraph.transforms.base import TransformSequence
+from taskgraph.util.hash import hash_path, hash_paths
+from taskgraph.util.memoize import memoize
+
+from adhoc_taskgraph.signing_manifest import MANIFEST_DIR
+
+transforms = TransformSequence()
+
+BASE_DIR = os.getcwd()
+
+
+@transforms.add
+def add_resources(config, tasks):
+    for task in tasks:
+        resources = set(task.pop("resources", []))
+        resources.add(
+            os.path.join(MANIFEST_DIR, f"{task['extra']['manifest-name']}.yml")
+        )
+        resources = list(resources)
+        attributes = task.setdefault("attributes", {})
+        if attributes.get("resources") is not None:
+            if resources and attributes["resources"] != resources:
+                raise Exception(
+                    f"setting {config.kind} {task.get('name')} "
+                    f"task.attributes.resources to {resources}: "
+                    f"it's already set to {attributes['resources']}!"
+                )
+        attributes["resources"] = resources
+        yield task
+
+
+@transforms.add
+def build_cache(config, tasks):
+    for task in tasks:
+        if task.get("cache", True) and not taskgraph.fast:
+            digest_data = []
+            digest_data.append(
+                json.dumps(
+                    task.get("attributes", {}).get("digest-extra", {}),
+                    indent=2,
+                    sort_keys=True,
+                )
+            )
+            resources = task["attributes"]["resources"]
+            for resource in resources:
+                path = os.path.join(BASE_DIR, resource)
+                if os.path.isdir(resource):
+                    digest_data.append(hash_paths(path, [""]))
+                elif os.path.isfile(resource):
+                    digest_data.append(hash_path(path))
+                else:
+                    raise Exception(f"Unknown resource {resource}")
+            cache_name = task["name"].replace(":", "-")
+            task["cache"] = {
+                "type": f"adhoc-signing.v1.{config.kind}",
+                "name": cache_name,
+                "digest-data": digest_data,
+            }
+
+        yield task
+
+
+@transforms.add
+def set_label(config, jobs):
+    """Set the job label, which the `cached_tasks` transform needs"""
+    for job in jobs:
+        job.setdefault("label", f"{config.kind}-{job.pop('name')}")
+        yield job
diff --git a/taskcluster/ci/dep-signing/kind.yml b/taskcluster/ci/dep-signing/kind.yml
index 88d4817..e7318dd 100644
--- a/taskcluster/ci/dep-signing/kind.yml
+++ b/taskcluster/ci/dep-signing/kind.yml
@@ -10,6 +10,8 @@ kind-dependencies:
 
 transforms:
     - adhoc_taskgraph.transforms.signing:transforms
+    - adhoc_taskgraph.transforms.cached:transforms
+    - taskgraph.transforms.cached_tasks:transforms
     - taskgraph.transforms.task:transforms
 
 job-template: