diff --git a/Cargo.toml b/Cargo.toml
index d03092ac..b2e05bcc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,8 +23,7 @@ thiserror = "1.0.20"
 tracing-subscriber = "0.2.11"
 
 # [dependencies.ruma]
-# git = "https://github.com/ruma/ruma"
-# rev = "d5d2d1d893fa12d27960e4c58d6c09b215d06e95"
+# path = "../__forks__/ruma/ruma"
 # features = ["client-api", "federation-api", "appservice-api"]
 
 [dependencies.ruma]
diff --git a/src/event_auth.rs b/src/event_auth.rs
index d6c9e57b..ed9e182e 100644
--- a/src/event_auth.rs
+++ b/src/event_auth.rs
@@ -105,10 +105,21 @@ pub fn auth_check(
             false
         };
 
+        // check the event has been signed by the domain of the sender
         if event.signatures().get(sender_domain).is_none() && !is_invite_via_3pid {
             tracing::warn!("event not signed by sender's server");
             return Some(false);
         }
+
+        if event.room_version() == RoomVersionId::Version1
+            && event
+                .signatures()
+                .get(event.event_id().server_name().unwrap())
+                .is_none()
+        {
+            tracing::warn!("event not signed by event_id's server");
+            return Some(false);
+        }
     }
 
     // TODO do_size_check is false when called by `iterative_auth_check`
@@ -128,7 +139,6 @@ pub fn auth_check(
         }
 
         // if content.room_version is present and is not a valid version
-        // TODO check this out (what event has this as content?)
         if serde_json::from_value::<RoomVersionId>(
             event
                 .content()
diff --git a/src/lib.rs b/src/lib.rs
index 1733859c..0e9b4574 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -352,12 +352,6 @@ impl StateResolution {
 
             tracing::debug!("{:?}", (-*pl, *ev.origin_server_ts(), ev.event_id()));
 
-            // count_0.sort_by(|(x, _), (y, _)| {
-            //     x.power_level
-            //         .cmp(&a.power_level)
-            //         .then_with(|| x.origin_server.ts.cmp(&y.origin_server_ts))
-            //         .then_with(|| x.event_id.cmp(&y.event_id))
-
             // This return value is the key used for sorting events,
             // events are then sorted by power level, time,
             // and lexically by event_id.
diff --git a/src/state_event.rs b/src/state_event.rs
index 5830a267..e15d0531 100644
--- a/src/state_event.rs
+++ b/src/state_event.rs
@@ -8,7 +8,7 @@ use ruma::{
         room::member::{MemberEventContent, MembershipState},
         EventDeHelper, EventType,
     },
-    identifiers::{EventId, RoomId, ServerName, UserId},
+    EventId, RoomId, RoomVersionId, ServerName, UserId,
 };
 use serde::{de, Serialize};
 use serde_json::value::RawValue as RawJsonValue;
@@ -332,6 +332,23 @@ impl StateEvent {
             },
         }
     }
+
+    /// Returns the room version this event is formatted for.
+    ///
+    /// Currently either version 1 or 3 is returned, 3 represents
+    /// version 3 and above.
+    pub fn room_version(&self) -> RoomVersionId {
+        match self {
+            Self::Full(ev) => match ev {
+                Pdu::RoomV1Pdu(_) => RoomVersionId::Version1,
+                Pdu::RoomV3Pdu(_) => RoomVersionId::Version3,
+            },
+            Self::Sync(ev) => match ev {
+                PduStub::RoomV1PduStub(_) => RoomVersionId::Version1,
+                PduStub::RoomV3PduStub(_) => RoomVersionId::Version3,
+            },
+        }
+    }
 }
 
 impl<'de> de::Deserialize<'de> for StateEvent {