diff --git a/omlmd/cli.py b/omlmd/cli.py
index 47772df..8d66eca 100644
--- a/omlmd/cli.py
+++ b/omlmd/cli.py
@@ -41,7 +41,7 @@ def cli():
 @click.option("--media-types", "-m", multiple=True, default=[])
 def pull(plain_http: bool, target: str, output: Path, media_types: tuple[str]):
     """Pulls an OCI Artifact containing ML model and metadata, filtering if necessary."""
-    Helper.from_plain(plain_http).pull(target, output, media_types)
+    Helper.from_default_registry(plain_http).pull(target, output, media_types)
 
 
 @cli.group()
@@ -54,7 +54,7 @@ def get():
 @click.argument("target", required=True)
 def config(plain_http: bool, target: str):
     """Outputs configuration of the given OCI Artifact for ML model and metadata."""
-    click.echo(Helper.from_plain(plain_http).get_config(target))
+    click.echo(Helper.from_default_registry(plain_http).get_config(target))
 
 
 @cli.command()
@@ -62,7 +62,7 @@ def config(plain_http: bool, target: str):
 @click.argument("targets", required=True, nargs=-1)
 def crawl(plain_http: bool, targets: tuple[str]):
     """Crawls configuration for the given list of OCI Artifact for ML model and metadata."""
-    click.echo(Helper.from_plain(plain_http).crawl(targets))
+    click.echo(Helper.from_default_registry(plain_http).crawl(targets))
 
 
 @cli.command()
@@ -96,4 +96,4 @@ def push(
     if empty_metadata:
         logger.warning(f"Pushing to {target} with empty metadata.")
     md = deserialize_mdfile(metadata) if metadata else {}
-    click.echo(Helper.from_plain(plain_http).push(target, path, **md))
+    click.echo(Helper.from_default_registry(plain_http).push(target, path, **md))
diff --git a/omlmd/helpers.py b/omlmd/helpers.py
index e2f9044..7f4aea6 100644
--- a/omlmd/helpers.py
+++ b/omlmd/helpers.py
@@ -28,7 +28,7 @@ def download_file(uri: str):
 
 @dataclass
 class Helper:
-    registry: OMLMDRegistry = (
+    _registry: OMLMDRegistry = (
         field(  # TODO: this is a bit limiting when used from CLI, to be refactored
             default_factory=lambda: OMLMDRegistry(insecure=True)
         )
@@ -36,7 +36,7 @@ class Helper:
     _listeners: list[Listener] = field(default_factory=list)
 
     @classmethod
-    def from_plain(cls, insecure: bool):
+    def from_default_registry(cls, insecure: bool):
         return cls(OMLMDRegistry(insecure=insecure))
 
     def push(
@@ -92,7 +92,7 @@ def push(
         ]
         try:
             # print(target, files, model_metadata.to_annotations_dict())
-            result = self.registry.push(
+            result = self._registry.push(
                 target=target,
                 files=files,
                 manifest_annotations=model_metadata.to_annotations_dict(),
@@ -115,10 +115,10 @@ def push(
     def pull(
         self, target: str, outdir: Path | str, media_types: Sequence[str] | None = None
     ):
-        self.registry.download_layers(target, outdir, media_types)
+        self._registry.download_layers(target, outdir, media_types)
 
     def get_config(self, target: str) -> str:
-        return f'{{"reference":"{target}", "config": {self.registry.get_config(target)} }}'  # this assumes OCI Manifest.Config later is JSON (per std spec)
+        return f'{{"reference":"{target}", "config": {self._registry.get_config(target)} }}'  # this assumes OCI Manifest.Config later is JSON (per std spec)
 
     def crawl(self, targets: Sequence[str]) -> str:
         configs = map(self.get_config, targets)
diff --git a/omlmd/listener.py b/omlmd/listener.py
index 3c59d25..51583fa 100644
--- a/omlmd/listener.py
+++ b/omlmd/listener.py
@@ -26,6 +26,6 @@ class Event(ABC):
 
 @dataclass
 class PushEvent(Event):
-    sha: str
+    digest: str
     target: str
     metadata: ModelMetadata
diff --git a/tests/test_e2e_model_registry.py b/tests/test_e2e_model_registry.py
index f26f5f6..748e2e1 100644
--- a/tests/test_e2e_model_registry.py
+++ b/tests/test_e2e_model_registry.py
@@ -43,8 +43,8 @@ class ListenerForModelRegistry(Listener):
 
         def update(self, source: Helper, event: Event) -> None:
             if isinstance(event, PushEvent):
-                self.sha = event.sha
-                self.rm = from_oci_to_kfmr(model_registry, event, event.sha)
+                self.sha = event.digest
+                self.rm = from_oci_to_kfmr(model_registry, event, event.digest)
 
     listener = ListenerForModelRegistry()
     omlmd = Helper()