diff --git a/include/ircd/m/event/prev.h b/include/ircd/m/event/prev.h
index 22ad1f7aa..f5a738610 100644
--- a/include/ircd/m/event/prev.h
+++ b/include/ircd/m/event/prev.h
@@ -42,8 +42,6 @@ struct ircd::m::event::prev
 	json::property<name::prev_events, json::array>
 >
 {
-	enum cond :int;
-
 	std::tuple<event::id, string_view> auth_events(const size_t &idx) const;
 	std::tuple<event::id, string_view> prev_states(const size_t &idx) const;
 	std::tuple<event::id, string_view> prev_events(const size_t &idx) const;
@@ -52,14 +50,18 @@ struct ircd::m::event::prev
 	event::id prev_state(const size_t &idx) const;
 	event::id prev_event(const size_t &idx) const;
 
-	size_t auth_events_count() const;
-	size_t prev_states_count() const;
-	size_t prev_events_count() const;
+	bool auth_event_exists(const size_t &idx) const;
+	bool prev_state_exists(const size_t &idx) const;
+	bool prev_event_exists(const size_t &idx) const;
 
 	bool auth_events_has(const event::id &) const;
 	bool prev_states_has(const event::id &) const;
 	bool prev_events_has(const event::id &) const;
 
+	size_t auth_events_count() const;
+	size_t prev_states_count() const;
+	size_t prev_events_count() const;
+
 	using super_type::tuple;
 	using super_type::operator=;
 };
diff --git a/ircd/m_event.cc b/ircd/m_event.cc
index b8730dd0c..87f38e4c2 100644
--- a/ircd/m_event.cc
+++ b/ircd/m_event.cc
@@ -1656,6 +1656,27 @@ const
 // event/prev.h
 //
 
+bool
+ircd::m::event::prev::prev_event_exists(const size_t &idx)
+const
+{
+	return m::exists(prev_state(idx));
+}
+
+bool
+ircd::m::event::prev::prev_state_exists(const size_t &idx)
+const
+{
+	return m::exists(prev_state(idx));
+}
+
+bool
+ircd::m::event::prev::auth_event_exists(const size_t &idx)
+const
+{
+	return m::exists(auth_event(idx));
+}
+
 bool
 ircd::m::event::prev::prev_events_has(const event::id &event_id)
 const