diff --git a/include/ircd/m/user/keys.h b/include/ircd/m/user/keys.h
index e5d42d475..c04ccba2b 100644
--- a/include/ircd/m/user/keys.h
+++ b/include/ircd/m/user/keys.h
@@ -38,6 +38,7 @@ struct ircd::m::user::keys
 	void cross_self(json::stack::object &) const;
 	void cross_user(json::stack::object &) const;
 
+	bool claim(json::stack::object &, const string_view &device_id, const string_view &algo) const;
 	void update(const m::signing_key_update &) const;
 
 	keys(const m::user &user)
diff --git a/matrix/user_keys.cc b/matrix/user_keys.cc
index cdaa505e5..1121c8ad7 100644
--- a/matrix/user_keys.cc
+++ b/matrix/user_keys.cc
@@ -138,6 +138,78 @@ const
 	};
 }
 
+bool
+ircd::m::user::keys::claim(json::stack::object &object,
+                           const string_view &device_id,
+                           const string_view &algorithm)
+const
+{
+	const fmt::bsprintf<m::event::TYPE_MAX_SIZE> type
+	{
+		"ircd.device.one_time_key|%s",
+		algorithm
+	};
+
+	const m::room::type events
+	{
+		user_room, type, { -1UL, -1L }, true
+	};
+
+	return !events.for_each([this, &object, &device_id]
+	(const string_view &type, const auto &, const m::event::idx &event_idx)
+	{
+		if(m::redacted(event_idx))
+			return true;
+
+		const bool match
+		{
+			m::query(std::nothrow, event_idx, "state_key", [&device_id]
+			(const string_view &state_key) noexcept
+			{
+				return state_key == device_id;
+			})
+		};
+
+		if(!match)
+			return true;
+
+		const auto algorithm
+		{
+			split(type, '|').second
+		};
+
+		const bool fetched
+		{
+			m::get(std::nothrow, event_idx, "content", [&object, &algorithm]
+			(const json::object &content)
+			{
+				json::stack::member
+				{
+					object, algorithm, json::object
+					{
+						content[""] // ircd.device.* quirk
+					}
+				};
+			})
+		};
+
+		if(!fetched)
+			return true;
+
+		const auto event_id
+		{
+			m::event_id(event_idx)
+		};
+
+		const auto redact_id
+		{
+			m::redact(user_room, user_room.user, event_id, "claimed")
+		};
+
+		return false;
+	});
+}
+
 void
 ircd::m::user::keys::device(json::stack::object &out,
                             const string_view &device_id)
diff --git a/modules/federation/user_keys_claim.cc b/modules/federation/user_keys_claim.cc
index aa3e6e064..412a1fcb8 100644
--- a/modules/federation/user_keys_claim.cc
+++ b/modules/federation/user_keys_claim.cc
@@ -67,7 +67,7 @@ post__user_keys_claim(client &client,
 		if(!m::exists(user_id))
 			continue;
 
-		const m::user::room user_room
+		const m::user::keys keys
 		{
 			user_id
 		};
@@ -77,19 +77,11 @@ post__user_keys_claim(client &client,
 			response_keys, user_id
 		};
 
-		for(const auto &[device_id_, algorithm_] : json::object(devices))
+		for(const auto &[device_id, algorithm_] : json::object(devices))
 		{
-			const auto &device_id{device_id_};
-			const json::string &algorithm{algorithm_};
-			const fmt::bsprintf<m::event::TYPE_MAX_SIZE> type
+			const json::string algorithm
 			{
-				"ircd.device.one_time_key|%s",
-				algorithm
-			};
-
-			const m::room::type events
-			{
-				user_room, type, { -1UL, -1L }, true
+				algorithm_
 			};
 
 			json::stack::object response_device
@@ -97,54 +89,7 @@ post__user_keys_claim(client &client,
 				response_user, device_id
 			};
 
-			events.for_each([&user_room, &response_device, &device_id, &algorithm]
-			(const string_view &type, const auto &, const m::event::idx &event_idx)
-			{
-				if(m::redacted(event_idx))
-					return true;
-
-				const bool match
-				{
-					m::query(std::nothrow, event_idx, "state_key", [&device_id]
-					(const string_view &state_key) noexcept
-					{
-						return state_key == device_id;
-					})
-				};
-
-				if(!match)
-					return true;
-
-				const bool fetched
-				{
-					m::get(std::nothrow, event_idx, "content", [&response_device, &algorithm]
-					(const json::object &content)
-					{
-						json::stack::member
-						{
-							response_device, algorithm, json::object
-							{
-								content[""] // ircd.device.* quirk
-							}
-						};
-					})
-				};
-
-				if(!fetched)
-					return true;
-
-				const auto event_id
-				{
-					m::event_id(event_idx)
-				};
-
-				const auto redact_id
-				{
-					m::redact(user_room, user_room.user, event_id, "claimed")
-				};
-
-				return false;
-			});
+			keys.claim(response_device, device_id, algorithm);
 		}
 	}