diff --git a/eve_orehold_watcher.py b/eve_orehold_watcher.py
index d775fb9..5db5e05 100644
--- a/eve_orehold_watcher.py
+++ b/eve_orehold_watcher.py
@@ -32,6 +32,7 @@ import configparser
 import json
 import os
 import re
+import socket
 import sys
 import time
 import urllib.request
@@ -40,6 +41,27 @@ HERE = os.path.dirname(os.path.abspath(__file__))
 CONFIG_PATH = os.path.join(HERE, "config.ini")
 
 
+def heartbeat(cp, source):
+    """Post a one-line 'watcher online' to Discord so installs are verifiable at a
+    glance. Deduped to at most once per 6h per source to avoid restart spam."""
+    marker = os.path.join(HERE, f".hb_{source}")
+    try:
+        if os.path.exists(marker) and time.time() - os.path.getmtime(marker) < 6 * 3600:
+            return
+    except Exception:
+        pass
+    try:
+        host = socket.gethostname()
+    except Exception:
+        host = "PC"
+    _discord(cp, "🟢 Watcher online", f"`{source}` running on **{host}**.")
+    try:
+        with open(marker, "w") as f:
+            f.write(str(int(time.time())))
+    except Exception:
+        pass
+
+
 # --------------------------------------------------------------------------- #
 # Config
 # --------------------------------------------------------------------------- #
@@ -396,6 +418,7 @@ def main():
         return
     mode = cp.get("watcher", "mode", fallback="ocr").strip().lower()
     print(f"=== eve_orehold_watcher starting (mode={mode}) ===")
+    heartbeat(cp, "orehold")
     if mode == "ocr":
         run_ocr(cp)
     elif mode == "timer":