diff --git a/server.py b/server.py
index f96811a..2e23eb7 100644
--- a/server.py
+++ b/server.py
@@ -889,9 +889,8 @@ async def get_asset(name: str):
     return registry["assets"][name]
 
 
-@app.post("/registry")
-async def register_asset(req: RegisterRequest):
-    """Register a new asset and create ownership activity."""
+def _register_asset_impl(req: RegisterRequest, owner: str):
+    """Internal implementation for registering an asset."""
     registry = load_registry()
 
     # Check if name exists
@@ -908,6 +907,7 @@ async def register_asset(req: RegisterRequest):
         "metadata": req.metadata,
         "url": req.url,
         "provenance": req.provenance,
+        "owner": owner,
         "created_at": now
     }
 
@@ -921,7 +921,7 @@ async def register_asset(req: RegisterRequest):
     activity = {
         "activity_id": str(uuid.uuid4()),
         "activity_type": "Create",
-        "actor_id": f"https://{DOMAIN}/users/{USERNAME}",
+        "actor_id": f"https://{DOMAIN}/users/{owner}",
         "object_data": {
             "type": req.asset_type.capitalize(),
             "name": req.name,
@@ -930,7 +930,7 @@ async def register_asset(req: RegisterRequest):
                 "algorithm": "sha3-256",
                 "value": req.content_hash
             },
-            "attributedTo": f"https://{DOMAIN}/users/{USERNAME}"
+            "attributedTo": f"https://{DOMAIN}/users/{owner}"
         },
         "published": now
     }
@@ -946,9 +946,15 @@ async def register_asset(req: RegisterRequest):
     return {"asset": asset, "activity": activity}
 
 
+@app.post("/registry")
+async def register_asset(req: RegisterRequest, user: User = Depends(get_required_user)):
+    """Register a new asset and create ownership activity. Requires authentication."""
+    return _register_asset_impl(req, user.username)
+
+
 @app.post("/registry/record-run")
-async def record_run(req: RecordRunRequest):
-    """Record an L1 run and register the output."""
+async def record_run(req: RecordRunRequest, user: User = Depends(get_required_user)):
+    """Record an L1 run and register the output. Requires authentication."""
     # Fetch run from L1 server
     try:
         resp = requests.get(f"{L1_SERVER}/runs/{req.run_id}")
@@ -972,15 +978,15 @@ async def record_run(req: RecordRunRequest):
         "rendered_at": run.get("completed_at")
     }
 
-    # Register the output
-    return await register_asset(RegisterRequest(
+    # Register the output under the authenticated user
+    return _register_asset_impl(RegisterRequest(
         name=req.output_name,
         content_hash=output_hash,
         asset_type="video",  # Could be smarter about this
         tags=["rendered", "l1"],
         metadata={"l1_run_id": req.run_id},
         provenance=provenance
-    ))
+    ), user.username)
 
 
 # ============ Activities Endpoints ============