diff --git a/ircd/m/event.cc b/ircd/m/event.cc
index af134ecb6..ade650f81 100644
--- a/ircd/m/event.cc
+++ b/ircd/m/event.cc
@@ -496,15 +496,101 @@ ircd::m::event::signatures(const mutable_buffer &out,
 
 ircd::ed25519::sig
 ircd::m::event::sign(json::iov &event,
-                     const json::iov &content)
+                     const json::iov &contents)
 {
-	//TODO: essential keys
-	const json::iov::push _content
+	const auto &type
 	{
-		event, { "content", "{}" }
+		event.at("type")
 	};
 
-	return sign(event);
+	if(type == "m.room.aliases")
+	{
+		const json::iov::push _content{event,
+		{
+			"content", json::members
+			{
+				{ "aliases", contents.at("aliases") }
+			}
+		}};
+
+		return sign(event);
+	}
+	else if(type == "m.room.create")
+	{
+		const json::iov::push _content{event,
+		{
+			"content", json::members
+			{
+				{ "creator", contents.at("creator") }
+			}
+		}};
+
+		return sign(event);
+	}
+	else if(type == "m.room.history_visibility")
+	{
+		const json::iov::push _content{event,
+		{
+			"content", json::members
+			{
+				{ "history_visibility", contents.at("history_visibility") }
+			}
+		}};
+
+		return sign(event);
+	}
+	else if(type == "m.room.join_rules")
+	{
+		const json::iov::push _content{event,
+		{
+			"content", json::members
+			{
+				{ "join_rule", contents.at("join_rule") }
+			}
+		}};
+
+		return sign(event);
+	}
+	else if(type == "m.room.member")
+	{
+		const json::iov::push _content{event,
+		{
+			"content", json::members
+			{
+				{ "membership", contents.at("membership") }
+			}
+		}};
+
+		return sign(event);
+	}
+	else if(type == "m.room.power_levels")
+	{
+		const json::iov::push _content{event,
+		{
+			"content", json::members
+			{
+				{ "ban", contents.at("ban")                        },
+				{ "events", contents.at("events")                  },
+				{ "events_default", contents.at("events_default")  },
+				{ "kick", contents.at("kick")                      },
+				{ "redact", contents.at("redact")                  },
+				{ "state_default", contents.at("state_default")    },
+				{ "users", contents.at("users")                    },
+				{ "users_default", contents.at("users_default")    },
+			}
+		}};
+
+		return sign(event);
+	}
+	else
+	{
+		const json::iov::push _content
+		{
+			event, { "content", "{}" }
+		};
+
+		return sign(event);
+	}
 }
 
 ircd::ed25519::sig