1 files changed, 6 insertions, 5 deletions
diff --git a/packages/meshbay-hub/src/meshbay_hub/static/transport-chat.js b/packages/meshbay-hub/src/meshbay_hub/static/transport-chat.js
index d6d733f..e49eb4c 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/transport-chat.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/transport-chat.js
@@ -157,7 +157,7 @@ extendTransport(class {
     const epoch = this.chatEpoch || keys.current;
     const epochKey = keys.byEpoch.get(epoch);
     if (!epochKey) throw new Error('No chat key for this group — reconnect');
-    if (!this.devicePk || !this._sessionKeys || !this._sessionKeys.skEdB64) {
+    if (!this.devicePk || !this._identity) {
       throw new Error('This device is not identified to the node — reconnect');
     }
 
@@ -172,9 +172,11 @@ extendTransport(class {
     const { nonce, ct } = await C.sealChat(
       epochKey, gid, epoch, this.devicePk, plaintext);
     const device = C.b64decode(this.devicePk);
-    const sig = C.b64decode(await window.MeshBayKeys.signBytes(
-      this._sessionKeys.skEdB64,
-      C.chatSigningTranscript(gid, epoch, device, nonce, ct)));
+    // The transcript names the signing device as this identity's own key,
+    // which is what `devicePk` is once the node has been told (device_hello).
+    const sig = C.b64decode(await this._identity.signAs('chat', {
+      groupId: gid, epoch, nonce: C.b64encode(nonce), ct: C.b64encode(ct),
+    }));
 
     const msg = await this._sendAndWait({
       type: 'chat_msg',
@@ -212,7 +214,6 @@ extendTransport(class {
     if (msg.epoch) this.chatEpoch = msg.epoch;
     this._chatKeys = null;
     this._chatKeysInFlight = null;
-    if (this._onChatEpoch) this._onChatEpoch(this.chatEpoch);
   }
 
   /**