diff --git a/src/routes.rs b/src/routes.rs
index 2ddf57f..1fae5e9 100644
--- a/src/routes.rs
+++ b/src/routes.rs
@@ -332,7 +332,7 @@ pub struct InEntry {
 }
 
 #[derive(Debug, Clone, Deserialize)]
-#[serde(untagged)]
+#[serde(untagged, deny_unknown_fields)]
 pub enum PutInput {
     Entry(InEntry),
     EntryList(Vec<Entry>),
@@ -436,11 +436,7 @@ pub async fn put_object(
 
                     let label_entry = match &address {
                         Address::Hash(_) | Address::Uuid(_) => None,
-                        Address::Attribute(attribute) => Some(Entry {
-                            entity: address.clone(),
-                            attribute: LABEL_ATTR.to_string(),
-                            value: format!("ATTRIBUTE: {attribute}").into(),
-                        }),
+                        Address::Attribute(_) => None,
                         Address::Url(url) => Some(Entry {
                             entity: address.clone(),
                             attribute: LABEL_ATTR.to_string(),