diff --git a/rmw_zenoh_cpp/src/detail/graph_cache.cpp b/rmw_zenoh_cpp/src/detail/graph_cache.cpp
index 74b50658..bad12959 100644
--- a/rmw_zenoh_cpp/src/detail/graph_cache.cpp
+++ b/rmw_zenoh_cpp/src/detail/graph_cache.cpp
@@ -319,7 +319,7 @@ void GraphCache::take_entities_with_events(const EntityEventMap & entities_with_
   for (const auto & [local_entity, event_set] : entities_with_events) {
     // Trigger callback set for this entity for the event type.
     GraphEventCallbackMap::const_iterator event_callbacks_it =
-      event_callbacks_.find(local_entity);
+      event_callbacks_.find(local_entity->guid());
     if (event_callbacks_it != event_callbacks_.end()) {
       for (const rmw_zenoh_event_type_t & event_type : event_set) {
         GraphEventCallbacks::const_iterator callback_it =
@@ -858,7 +858,7 @@ rmw_ret_t GraphCache::publisher_count_matched_subscriptions(
   // TODO(Yadunund): Replace this logic by returning a number that is tracked once
   // we support matched qos events.
   *subscription_count = 0;
-  auto topic_info = pub_data->entity()->topic_info().value();
+  auto topic_info = pub_data->topic_info();
   GraphNode::TopicMap::const_iterator topic_it = graph_topics_.find(topic_info.name_);
   if (topic_it != graph_topics_.end()) {
     GraphNode::TopicTypeMap::const_iterator topic_data_it = topic_it->second.find(
@@ -1243,7 +1243,7 @@ rmw_ret_t GraphCache::service_server_is_available(
 
 ///=============================================================================
 void GraphCache::set_qos_event_callback(
-  liveliness::ConstEntityPtr entity,
+  std::size_t entity_guid,
   const rmw_zenoh_event_type_t & event_type,
   GraphCacheEventCallback callback)
 {
@@ -1256,20 +1256,20 @@ void GraphCache::set_qos_event_callback(
     return;
   }
 
-  const GraphEventCallbackMap::iterator event_cb_it = event_callbacks_.find(entity);
+  const GraphEventCallbackMap::iterator event_cb_it = event_callbacks_.find(entity_guid);
   if (event_cb_it == event_callbacks_.end()) {
     // First time a callback is being set for this entity.
-    event_callbacks_[entity] = {std::make_pair(event_type, std::move(callback))};
+    event_callbacks_[entity_guid] = {std::make_pair(event_type, std::move(callback))};
     return;
   }
   event_cb_it->second[event_type] = std::move(callback);
 }
 
 ///=============================================================================
-void GraphCache::remove_qos_event_callbacks(liveliness::ConstEntityPtr entity)
+void GraphCache::remove_qos_event_callbacks(std::size_t entity_guid)
 {
   std::lock_guard<std::mutex> lock(graph_mutex_);
-  event_callbacks_.erase(entity);
+  event_callbacks_.erase(entity_guid);
 }
 
 ///=============================================================================
diff --git a/rmw_zenoh_cpp/src/detail/graph_cache.hpp b/rmw_zenoh_cpp/src/detail/graph_cache.hpp
index 420e91ed..a07bf3d9 100644
--- a/rmw_zenoh_cpp/src/detail/graph_cache.hpp
+++ b/rmw_zenoh_cpp/src/detail/graph_cache.hpp
@@ -184,12 +184,12 @@ class GraphCache final
   /// Set a qos event callback for an entity from the current session.
   /// @note The callback will be removed when the entity is removed from the graph.
   void set_qos_event_callback(
-    liveliness::ConstEntityPtr entity,
+    std::size_t entity_guid,
     const rmw_zenoh_event_type_t & event_type,
     GraphCacheEventCallback callback);
 
   /// Remove all qos event callbacks for an entity.
-  void remove_qos_event_callbacks(liveliness::ConstEntityPtr entity);
+  void remove_qos_event_callbacks(std::size_t entity_guid);
 
   /// Returns true if the entity is a publisher or client. False otherwise.
   static bool is_entity_pub(const liveliness::Entity & entity);
@@ -290,13 +290,13 @@ class GraphCache final
   GraphNode::TopicMap graph_services_ = {};
 
   using GraphEventCallbacks = std::unordered_map<rmw_zenoh_event_type_t, GraphCacheEventCallback>;
-  // Map entity (based on uuid) to a map of event callbacks.
+  // Map an entity's guid to a map of event callbacks.
   // Note: Since we use unordered_map, we will only store a single callback for an
   // entity string. So we do not support the case where a node create a duplicate
   // pub/sub with the exact same topic, type & QoS but registers a different callback
   // for the same event type. We could switch to a multimap here but removing the callback
   // will be impossible right now since entities do not have unique IDs.
-  using GraphEventCallbackMap = std::unordered_map<liveliness::ConstEntityPtr, GraphEventCallbacks>;
+  using GraphEventCallbackMap = std::unordered_map<std::size_t, GraphEventCallbacks>;
   // EventCallbackMap for each type of event we support in rmw_zenoh_cpp.
   GraphEventCallbackMap event_callbacks_;
   // Map keyexpressions to QueryingSubscriberCallback.
diff --git a/rmw_zenoh_cpp/src/detail/rmw_publisher_data.cpp b/rmw_zenoh_cpp/src/detail/rmw_publisher_data.cpp
index 10505fef..92c17952 100644
--- a/rmw_zenoh_cpp/src/detail/rmw_publisher_data.cpp
+++ b/rmw_zenoh_cpp/src/detail/rmw_publisher_data.cpp
@@ -373,10 +373,17 @@ rmw_ret_t PublisherData::publish(
 }
 
 ///=============================================================================
-std::shared_ptr<const liveliness::Entity> PublisherData::entity() const
+std::size_t PublisherData::guid() const
 {
   std::lock_guard<std::mutex> lock(mutex_);
-  return entity_;
+  return entity_->guid();
+}
+
+///=============================================================================
+liveliness::TopicInfo PublisherData::topic_info() const
+{
+  std::lock_guard<std::mutex> lock(mutex_);
+  return entity_->topic_info().value();
 }
 
 ///=============================================================================
diff --git a/rmw_zenoh_cpp/src/detail/rmw_publisher_data.hpp b/rmw_zenoh_cpp/src/detail/rmw_publisher_data.hpp
index 8e7279b7..9a2dfda9 100644
--- a/rmw_zenoh_cpp/src/detail/rmw_publisher_data.hpp
+++ b/rmw_zenoh_cpp/src/detail/rmw_publisher_data.hpp
@@ -59,12 +59,15 @@ class PublisherData final
     const void * ros_message,
     std::optional<zc_owned_shm_manager_t> & shm_manager);
 
-  // Get the entity from this PublisherData.
-  std::shared_ptr<const liveliness::Entity> entity() const;
-
   // Get the next sequence number.
   size_t get_next_sequence_number();
 
+  // Get a copy of the GUID of this PublisherData's liveliness::Entity.
+  std::size_t guid() const;
+
+  // Get a copy of the TopicInfo of this PublisherData.
+  liveliness::TopicInfo topic_info() const;
+
   // Get the GID of this PublisherData.
   const uint8_t * gid() const;
 
diff --git a/rmw_zenoh_cpp/src/rmw_event.cpp b/rmw_zenoh_cpp/src/rmw_event.cpp
index b0b4e5c8..e8846d47 100644
--- a/rmw_zenoh_cpp/src/rmw_event.cpp
+++ b/rmw_zenoh_cpp/src/rmw_event.cpp
@@ -70,7 +70,7 @@ rmw_publisher_event_init(
 
   // Register the event with graph cache.
   context_impl->graph_cache()->set_qos_event_callback(
-    pub_data->entity(),
+    pub_data->guid(),
     zenoh_event_type,
     [pub_data,
     zenoh_event_type](std::unique_ptr<rmw_zenoh_cpp::rmw_zenoh_event_status_t> zenoh_event)
@@ -132,7 +132,7 @@ rmw_subscription_event_init(
   }
 
   context_impl->graph_cache()->set_qos_event_callback(
-    sub_data->entity,
+    sub_data->entity->guid(),
     zenoh_event_type,
     [sub_data,
     zenoh_event_type](std::unique_ptr<rmw_zenoh_cpp::rmw_zenoh_event_status_t> zenoh_event)
diff --git a/rmw_zenoh_cpp/src/rmw_zenoh.cpp b/rmw_zenoh_cpp/src/rmw_zenoh.cpp
index 203e2f3c..a33065d2 100644
--- a/rmw_zenoh_cpp/src/rmw_zenoh.cpp
+++ b/rmw_zenoh_cpp/src/rmw_zenoh.cpp
@@ -487,7 +487,7 @@ rmw_destroy_publisher(rmw_node_t * node, rmw_publisher_t * publisher)
     return RMW_RET_INVALID_ARGUMENT;
   }
   // Remove any event callbacks registered to this publisher.
-  context_impl->graph_cache()->remove_qos_event_callbacks(pub_data->entity());
+  context_impl->graph_cache()->remove_qos_event_callbacks(pub_data->guid());
   // Remove the PublisherData from NodeData.
   node_data->delete_pub_data(publisher);
 
@@ -1326,7 +1326,7 @@ rmw_destroy_subscription(rmw_node_t * node, rmw_subscription_t * subscription)
     }
 
     // Remove any event callbacks registered to this subscription.
-    context_impl->graph_cache()->remove_qos_event_callbacks(sub_data->entity);
+    context_impl->graph_cache()->remove_qos_event_callbacks(sub_data->entity->guid());
 
     RMW_TRY_DESTRUCTOR(sub_data->~rmw_subscription_data_t(), rmw_subscription_data_t, );
     allocator->deallocate(sub_data, allocator->state);