diff --git "a/src/api/routes/channels/\043channel_id/messages/\043message_id/index.ts" "b/src/api/routes/channels/\043channel_id/messages/\043message_id/index.ts"
index d91c705..1d06506 100644
--- "a/src/api/routes/channels/\043channel_id/messages/\043message_id/index.ts"
+++ "b/src/api/routes/channels/\043channel_id/messages/\043message_id/index.ts"
@@ -30,7 +30,7 @@
 	emitEvent,
 	getPermission,
 	getRights,
-	uploadFile
+	uploadFile, NewUrlUserSignatureData,
 } from "@spacebar/util";
 import { Request, Response, Router } from "express";
 import { HTTPError } from "lambert-server";
@@ -245,7 +245,10 @@
 			console.error("[Message] post-message handler failed", e),
 		);
 
-		return res.json(message.withSignedAttachments(req));
+		return res.json(message.withSignedAttachments(new NewUrlUserSignatureData({
+			ip: req.ip,
+			userAgent: req.headers["user-agent"] as string,
+		})));
 	},
 );
 
diff --git "a/src/api/routes/channels/\043channel_id/messages/index.ts" "b/src/api/routes/channels/\043channel_id/messages/index.ts"
index 743bc07..a33b749 100644
--- "a/src/api/routes/channels/\043channel_id/messages/index.ts"
+++ "b/src/api/routes/channels/\043channel_id/messages/index.ts"
@@ -36,7 +36,7 @@
 	getPermission,
 	isTextChannel,
 	getUrlSignature,
-	uploadFile, NewUrlSignatureData,
+	uploadFile, NewUrlSignatureData, NewUrlUserSignatureData,
 } from "@spacebar/util";
 import { Request, Response, Router } from "express";
 import { HTTPError } from "lambert-server";
@@ -439,7 +439,10 @@
 			console.error("[Message] post-message handler failed", e),
 		);
 
-		return res.json(message.withSignedAttachments(req));
+		return res.json(message.withSignedAttachments(new NewUrlUserSignatureData({
+			ip: req.ip,
+			userAgent: req.headers["user-agent"] as string,
+		})));
 	},
 );
 
diff --git a/src/gateway/util/WebSocket.ts b/src/gateway/util/WebSocket.ts
index 4dcec55..2f8fa7c 100644
--- a/src/gateway/util/WebSocket.ts
+++ b/src/gateway/util/WebSocket.ts
@@ -20,7 +20,6 @@
 import WS from "ws";
 import { Deflate, Inflate } from "fast-zlib";
 import { Capabilities } from "./Capabilities";
-import { Request } from "express";
 
 export interface WebSocket extends WS {
 	version: number;