diff --git a/logs/restart.out b/logs/restart.out
index bec910d..acd28f9 100644
--- a/logs/restart.out
+++ b/logs/restart.out
@@ -708,3 +708,223 @@ Full error response: {
     statusCode: 404
   }
 }
+❌ [ERROR] 2025-09-24T16:08:53.751Z HTTP GET / - 404
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 5,
+  request: {
+    ip: '::ffff:45.135.193.100',
+    method: 'GET',
+    url: '/',
+    userAgent: undefined
+  },
+  requestId: 'req_1758730133743_33hw2gjyt',
+  response: {
+    statusCode: 404
+  }
+}
+❌ [ERROR] 2025-09-24T16:10:45.200Z HTTP GET / - 404
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 1,
+  request: {
+    ip: '::ffff:159.65.20.49',
+    method: 'GET',
+    url: '/',
+    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36'
+  },
+  requestId: 'req_1758730245199_01y0lg4q2',
+  response: {
+    statusCode: 404
+  }
+}
+❌ [ERROR] 2025-09-24T16:10:45.282Z HTTP GET /download/powershell/ - 404
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 0,
+  request: {
+    ip: '::ffff:159.65.20.49',
+    method: 'GET',
+    url: '/download/powershell/',
+    userAgent: 'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko'
+  },
+  requestId: 'req_1758730245281_qipi9aix8',
+  response: {
+    statusCode: 404
+  }
+}
+❌ [ERROR] 2025-09-24T16:10:45.359Z HTTP GET /get.php - 404
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 0,
+  request: {
+    ip: '::ffff:159.65.20.49',
+    method: 'GET',
+    url: '/get.php',
+    userAgent: 'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko'
+  },
+  requestId: 'req_1758730245359_wc57j6ndv',
+  response: {
+    statusCode: 404
+  }
+}
+[IdNotCallback] incoming request {
+  originalUrl: '/idnot/callback?code=eyzP3g1U9rR_eU8posVgD-XrJHNyhgcf7Act7o2BLu3NDffTMYHDf8PnhBa87X1DpVlZiFfpAUZ5sDe0O1wwsLYYJqZG03XR6iy-FUvVRBq4_TBxteN6QlMNBrGZa8PIPLDduSgvTNd9co_9PG2NhvYk5ZDSZcaFVzSWC2IRYZNzKPnOfWd1NMr9aFK62xfpYnzMSER879r-IVOVR92hjXF63MA-TuuxQOO9WQgQ9gRrauQlJTrYIvnnjtoTd3hUjXiaK4wvlRyNNqYSkQXjdF2k4fanB9H4k8ioeQ3i6WcfPYiAoS4bP_DGhDOX4ed_Oso7XTk8RjymKAHVf-mR-of2n-WWQW0jAJFMlaJSFvSgm0KGZvsJcJX_oVQEiZ38dpiEJyVPiGV7WYzOH9Y35gzIl3CcFhAaIz9bqkpHLmZvNKQD_Q5NyaVa-WBoijrIltXfssA016g4qi6q4owykra7hOhH5URlk8_wfpR-jwe80NKZ55vPB0vhso-PWZ07aqc1oHVNpnN2dJGZSQJLm8nTTgEcDlFA7PewIXIg6eWHwUkZmJVLeU6hpAnlfgtUARoCczFcpktRLGzfY2XW-NHec1aIL0VC-7I0giWZtxY',
+  method: 'GET',
+  query: {
+    code_present: true,
+    code_length: 619,
+    state_present: false,
+    state_length: undefined
+  },
+  headers: {
+    host: 'dev3.4nkweb.com',
+    'x-forwarded-for': '212.133.41.15',
+    'x-forwarded-proto': 'https'
+  }
+}
+❌ [ERROR] 2025-09-24T16:15:36.750Z Application error occurred
+────────────────────────────────────────────────────────────────────────────────
+{
+  error: {
+    code: 'VALIDATION_ERROR',
+    details: [
+      {
+        constraints: [
+          'required'
+        ],
+        field: 'code',
+        value: 'eyzP3g1U9rR_eU8posVgD-XrJHNyhgcf7Act7o2BLu3NDffTMYHDf8PnhBa87X1DpVlZiFfpAUZ5sDe0O1wwsLYYJqZG03XR6iy-FUvVRBq4_TBxteN6QlMNBrGZa8PIPLDduSgvTNd9co_9PG2NhvYk5ZDSZcaFVzSWC2IRYZNzKPnOfWd1NMr9aFK62xfpYnzMSER8'... 419 more characters
+      },
+      {
+        constraints: [
+          'required'
+        ],
+        field: 'state',
+        value: undefined
+      }
+    ],
+    message: 'Missing code or state',
+    stack: 'Error: Missing code or state\n' +
+      '    at new ValidationError (/home/ank/dev/lecoffre-back-mini/dist/types/errors.js:64:9)\n' +
+      '    at /home/ank/dev/lecoffre-back-mini/dist/handlers/idnot-callback.handlers.js:39'... 1445 more characters,
+    statusCode: 400
+  },
+  request: {
+    ip: '::ffff:127.0.0.1',
+    method: 'GET',
+    url: '/idnot/callback?code=eyzP3g1U9rR_eU8posVgD-XrJHNyhgcf7Act7o2BLu3NDffTMYHDf8PnhBa87X1DpVlZiFfpAUZ5sDe0O1wwsLYYJqZG03XR6iy-FUvVRBq4_TBxteN6QlMNBrGZa8PIPLDduSgvTNd9co_9PG2NhvYk5ZDSZcaFVzSWC2IRYZNzKPnOfWd'... 440 more characters,
+    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36'
+  },
+  requestId: 'req_1758730536740_2hi0hct8u'
+}
+❌ [ERROR] 2025-09-24T16:15:36.757Z HTTP GET /idnot/callback?code=eyzP3g1U9rR_eU8posVgD-XrJHNyhgcf7Act7o2BLu3NDffTMYHDf8PnhBa87X1DpVlZiFfpAUZ5sDe0O1wwsLYYJqZG03XR6iy-FUvVRBq4_TBxteN6QlMNBrGZa8PIPLDduSgvTNd9co_9PG2NhvYk5ZDSZcaFVzSWC2IRYZNzKPnOfWd1NMr9aFK62xfpYnzMSER879r-IVOVR92hjXF63MA-TuuxQOO9WQgQ9gRrauQlJTrYIvnnjtoTd3hUjXiaK4wvlRyNNqYSkQXjdF2k4fanB9H4k8ioeQ3i6WcfPYiAoS4bP_DGhDOX4ed_Oso7XTk8RjymKAHVf-mR-of2n-WWQW0jAJFMlaJSFvSgm0KGZvsJcJX_oVQEiZ38dpiEJyVPiGV7WYzOH9Y35gzIl3CcFhAaIz9bqkpHLmZvNKQD_Q5NyaVa-WBoijrIltXfssA016g4qi6q4owykra7hOhH5URlk8_wfpR-jwe80NKZ55vPB0vhso-PWZ07aqc1oHVNpnN2dJGZSQJLm8nTTgEcDlFA7PewIXIg6eWHwUkZmJVLeU6hpAnlfgtUARoCczFcpktRLGzfY2XW-NHec1aIL0VC-7I0giWZtxY - 400
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 17,
+  request: {
+    ip: '::ffff:127.0.0.1',
+    method: 'GET',
+    url: '/idnot/callback?code=eyzP3g1U9rR_eU8posVgD-XrJHNyhgcf7Act7o2BLu3NDffTMYHDf8PnhBa87X1DpVlZiFfpAUZ5sDe0O1wwsLYYJqZG03XR6iy-FUvVRBq4_TBxteN6QlMNBrGZa8PIPLDduSgvTNd9co_9PG2NhvYk5ZDSZcaFVzSWC2IRYZNzKPnOfWd'... 440 more characters,
+    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36'
+  },
+  requestId: 'req_1758730536740_2hi0hct8u',
+  response: {
+    statusCode: 400
+  }
+}
+[IdNotCallback] incoming request {
+  originalUrl: '/idnot/callback',
+  method: 'GET',
+  query: {
+    code_present: false,
+    code_length: undefined,
+    state_present: false,
+    state_length: undefined
+  },
+  headers: {
+    host: 'dev3.4nkweb.com',
+    'x-forwarded-for': '212.133.41.15',
+    'x-forwarded-proto': 'https'
+  }
+}
+❌ [ERROR] 2025-09-24T16:15:40.294Z Application error occurred
+────────────────────────────────────────────────────────────────────────────────
+{
+  error: {
+    code: 'VALIDATION_ERROR',
+    details: [
+      {
+        constraints: [
+          'required'
+        ],
+        field: 'code',
+        value: undefined
+      },
+      {
+        constraints: [
+          'required'
+        ],
+        field: 'state',
+        value: undefined
+      }
+    ],
+    message: 'Missing code or state',
+    stack: 'Error: Missing code or state\n' +
+      '    at new ValidationError (/home/ank/dev/lecoffre-back-mini/dist/types/errors.js:64:9)\n' +
+      '    at /home/ank/dev/lecoffre-back-mini/dist/handlers/idnot-callback.handlers.js:39'... 1445 more characters,
+    statusCode: 400
+  },
+  request: {
+    ip: '::ffff:127.0.0.1',
+    method: 'GET',
+    url: '/idnot/callback',
+    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36'
+  },
+  requestId: 'req_1758730540293_zfsqodog5'
+}
+❌ [ERROR] 2025-09-24T16:15:40.296Z HTTP GET /idnot/callback - 400
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 3,
+  request: {
+    ip: '::ffff:127.0.0.1',
+    method: 'GET',
+    url: '/idnot/callback',
+    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36'
+  },
+  requestId: 'req_1758730540293_zfsqodog5',
+  response: {
+    statusCode: 400
+  }
+}
+❌ [ERROR] 2025-09-24T16:22:16.993Z HTTP GET / - 404
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 6,
+  request: {
+    ip: '::ffff:204.76.203.219',
+    method: 'GET',
+    url: '/',
+    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36 Edg/90.0.818.46'
+  },
+  requestId: 'req_1758730936984_72x2zwh0m',
+  response: {
+    statusCode: 404
+  }
+}
+ℹ️  [INFO] 2025-09-24T16:22:42.682Z HTTP POST /api/v1/idnot/state - 200
+────────────────────────────────────────────────────────────────────────────────
+{
+  duration: 21,
+  request: {
+    ip: '::ffff:127.0.0.1',
+    method: 'POST',
+    url: '/api/v1/idnot/state',
+    userAgent: 'curl/8.14.1'
+  },
+  requestId: 'req_1758730962656_wlye8imhw',
+  response: {
+    statusCode: 200
+  }
+}
diff --git a/package.json b/package.json
index 19acc49..cbbafeb 100644
--- a/package.json
+++ b/package.json
@@ -11,7 +11,8 @@
     "dev:js": "nodemon src/server.js",
     "test:db": "npm run build && node test-db-init.js",
     "test:rattachements": "node test-rattachements-endpoint.js",
-    "test:quick": "node quick-test-rattachements.js"
+    "test:quick": "node quick-test-rattachements.js",
+    "launch:check": "bash scripts/launch_check.sh"
   },
   "dependencies": {
     "@mailchimp/mailchimp_transactional": "^1.0.59",
diff --git a/scripts/launch_check.sh b/scripts/launch_check.sh
new file mode 100755
index 0000000..9b306c7
--- /dev/null
+++ b/scripts/launch_check.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "[1/6] Backing up nginx confs..."
+./scripts/backup_nginx_confs.sh
+
+echo "[2/6] Checking required environment variables..."
+REQUIRED=("PORT" "APP_HOST" "DEFAULT_STORAGE" "SIGNER_WS_URL" "SIGNER_API_KEY")
+MISSING=()
+for v in "${REQUIRED[@]}"; do
+  if [ -z "${!v:-}" ]; then MISSING+=("$v"); fi
+done
+if [ ${#MISSING[@]} -gt 0 ]; then
+  echo "Missing env vars: ${MISSING[*]}" >&2; exit 1; fi
+
+echo "[3/6] Building backend..."
+npm run build --silent
+
+echo "[4/6] Starting backend (detached) if not already running..."
+if ! nc -z localhost "${PORT}" >/dev/null 2>&1; then
+  nohup node dist/server.js > logs/backend.out 2>&1 &
+  echo $! > logs/server.pid
+  sleep 2
+fi
+if ! nc -z localhost "${PORT}" >/dev/null 2>&1; then echo "Backend not listening on ${PORT}" >&2; exit 1; fi
+
+echo "[5/6] Curl checks - backend health and key routes..."
+set +e
+curl -fsS "http://localhost:${PORT}/api/v1/health" | jq . >/dev/null && echo "OK /api/v1/health" || { echo "FAIL /api/v1/health"; exit 1; }
+curl -fsS -X OPTIONS -H "Origin: ${APP_HOST}" "http://localhost:${PORT}/api/v1/health" -o /dev/null && echo "OK CORS preflight" || { echo "FAIL CORS"; exit 1; }
+set -e
+
+echo "[6/6] External service checks..."
+echo "- Checking mempool signet..."
+curl -fsS "https://mempool2.4nkweb.com/fr/docs/api/rest" -o /dev/null && echo "OK mempool" || echo "WARN mempool unreachable"
+echo "- Checking signer relay ws..."
+if command -v wscat >/dev/null 2>&1; then
+  ( timeout 3 wscat -c "${SIGNER_WS_URL/ws:/wss:}" >/dev/null 2>&1 && echo "OK signer ws connect" ) || echo "WARN signer ws connect failed"
+else
+  echo "wscat not installed; skipping ws check"
+fi
+
+echo "All checks done."