diff --git a/CHANGELOG.md b/CHANGELOG.md
index c343ab0..e76f8c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ By: Codex (GPT-5)
 | 28.12.2025 | 📝 Req | ID: Update-Flow fuer Client dokumentiert. By: Codex (GPT-5) |
 | 28.12.2025 | 📝 Req | ID: Update-Flow Prototyp dokumentiert. By: Codex (GPT-5) |
 | 28.12.2025 | 📝 Req | ID: Update-Status-Schema dokumentiert. By: Codex (GPT-5) |
+| 28.12.2025 | ⚙️ Code | ID: Update-Status-URL und Report im Client-Prototyp. By: Codex (GPT-5) |
 | 28.12.2025 | ⚙️ Code | ID: Update-Client Prototyp-Skript hinzugefuegt. By: Codex (GPT-5) |
 
 ---
diff --git a/backend/settings.py b/backend/settings.py
index 1878e03..73a2ba7 100644
--- a/backend/settings.py
+++ b/backend/settings.py
@@ -42,6 +42,9 @@ class Settings:
         self.update_url: str = os.getenv("SKD_UPDATE_URL", "https://update.wlkns.org")
         self.update_token: str = os.getenv("SKD_UPDATE_TOKEN", "")
         self.update_interval: int = int(os.getenv("SKD_UPDATE_INTERVAL", "3600"))
+        self.update_status_url: str = os.getenv(
+            "SKD_UPDATE_STATUS_URL", "https://update.wlkns.org/status"
+        )
         # Paths/tools
         self.notify_send_path: str = os.getenv("SKD_NOTIFY_SEND_PATH", "notify-send")
         self.sound_player: str = os.getenv("SKD_SOUND_PLAYER", "paplay")
diff --git a/scripts/update_client.sh b/scripts/update_client.sh
index b9aea5c..2e0195d 100755
--- a/scripts/update_client.sh
+++ b/scripts/update_client.sh
@@ -4,6 +4,7 @@ set -euo pipefail
 SERVICE_NAME="${SERVICE_NAME:-skd}"
 UPDATE_URL="${SKD_UPDATE_URL:-https://update.wlkns.org}"
 UPDATE_TOKEN="${SKD_UPDATE_TOKEN:-}"
+STATUS_URL="${SKD_UPDATE_STATUS_URL:-https://update.wlkns.org/status}"
 INSTALL_DIR="${INSTALL_DIR:-/opt/sk}"
 STAGING_DIR=""
 MANIFEST_FILE=""
@@ -14,6 +15,24 @@ log() {
   echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*"
 }
 
+report_status() {
+  local status="$1"
+  local error="${2:-}"
+  local timestamp
+  timestamp="$(date -u '+%Y-%m-%dT%H:%M:%SZ')"
+  local payload
+  payload=$(cat <<JSON
+{"device_id":"$(hostname)","version":"${VERSION}","status":"${status}","error":"${error}","timestamp":"${timestamp}"}
+JSON
+)
+  if [[ -n "${UPDATE_TOKEN}" ]]; then
+    curl -sS -X POST -H "Authorization: Bearer ${UPDATE_TOKEN}" -H "Content-Type: application/json" \
+      -d "${payload}" "${STATUS_URL}" >/dev/null || true
+  else
+    curl -sS -X POST -H "Content-Type: application/json" -d "${payload}" "${STATUS_URL}" >/dev/null || true
+  fi
+}
+
 cleanup() {
   if [[ -n "${STAGING_DIR}" && -d "${STAGING_DIR}" ]]; then
     rm -rf "${STAGING_DIR}"
@@ -80,6 +99,7 @@ log "Verifying checksum..."
 CALC_SHA="$(sha256sum "${ARTIFACT_FILE}" | awk '{print $1}')"
 if [[ "${CALC_SHA}" != "${ARTIFACT_SHA256}" ]]; then
   echo "Checksum mismatch: expected ${ARTIFACT_SHA256} got ${CALC_SHA}" >&2
+  report_status "failed" "checksum mismatch"
   exit 1
 fi
 
@@ -101,6 +121,7 @@ STAGING_DIR=""
 log "Starting service ${SERVICE_NAME}..."
 if sudo systemctl start "${SERVICE_NAME}.service"; then
   log "Update applied successfully."
+  report_status "success" ""
 else
   log "Service failed to start, rolling back..."
   sudo rm -rf "${INSTALL_DIR}"
@@ -108,5 +129,6 @@ else
     sudo mv "${BACKUP_DIR}" "${INSTALL_DIR}"
   fi
   sudo systemctl start "${SERVICE_NAME}.service" || true
+  report_status "failed" "service start failed"
   exit 1
 fi