diff --git a/model_signing/manifest/manifest.py b/model_signing/manifest/manifest.py
index 9c53410c..be8d8672 100644
--- a/model_signing/manifest/manifest.py
+++ b/model_signing/manifest/manifest.py
@@ -41,6 +41,8 @@
 from typing import Self
 from typing_extensions import override
 
+from model_signing.hashing import hashing
+
 
 class ManifestItem(metaclass=ABCMeta):
     """An item that can be included in the manifest.
@@ -114,28 +116,21 @@ def from_str(as_str: str) -> Self:
         return ManifestFileChunkItem(file, start, end)
 
 
-@dataclass(frozen=True)
-class ManifestDigest:
-    """A computed digest (algorithm and hash) for a `ManifestItem`."""
-    algorithm: str
-    digest: bytes
-
-
 class Manifest(metaclass=ABCMeta):
     """Generic manifest file to represent a model."""
-    objects: dict[ManifestItem, ManifestDigest] = {}
+    objects: dict[ManifestItem, hashing.Digest] = {}
     constraints: list[set[ManifestItem]] = set()
 
-    def prepare_manifest_for_signing(self) -> Any:
-        """Computes the final form of the manifest for signing in memory.
+    #def prepare_manifest_for_signing(self) -> Any:
+    #    """Computes the final form of the manifest for signing in memory.
 
-        Implementations decide the output type, as this can be from an
-        external dependency.
+    #    Implementations decide the output type, as this can be from an
+    #    external dependency.
 
-        This method is optional, but implementations must define at least one
-        of `prepare_manifest_for_signing` and `write_manifest`.
-        """
-        pass
+    #    This method is optional, but implementations must define at least one
+    #    of `prepare_manifest_for_signing` and `write_manifest`.
+    #    """
+    #    pass
 
     def write_manifest(self, path: pathlib.Path) -> None:
         """Writes the manifest to a file to be signed afterwards.
@@ -171,7 +166,7 @@ def verify(self, only_for_objects: list[ManifestItem]) -> bool:
     @abstractmethod
     def update(
         self,
-        objects: dict[ManifestItem, ManifestDigest],
+        objects: dict[ManifestItem, hashing.Digest],
         constraints: list[set[ManifestItem]],
     ) -> None:
         """Updates the manifest with new integrity data."""