diff --git a/bin/lib/btc_ail.py b/bin/lib/btc_ail.py
index e17e257c..34ddd9d5 100755
--- a/bin/lib/btc_ail.py
+++ b/bin/lib/btc_ail.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+import json
+import logging
 import os
 import sys
 import requests
@@ -8,6 +10,8 @@ import requests
 sys.path.append(os.environ['AIL_BIN'])
 from lib.objects.CryptoCurrencies import CryptoCurrency
 
+logger = logging.getLogger()
+
 blockchain_all = 'https://blockchain.info/rawaddr'
 
 # pre-alpha script
@@ -18,23 +22,26 @@ def get_bitcoin_info(bitcoin_address, nb_transaction=50):
     set_btc_in = set()
     set_btc_out = set()
     try:
-        req = requests.get('{}/{}?limit={}'.format(blockchain_all, bitcoin_address, nb_transaction))
+        req = requests.get(f'{blockchain_all}/{bitcoin_address}?limit={nb_transaction}')
         jreq = req.json()
     except Exception as e:
-        print(e)
+        logger.warning(e)
+        return dict_btc
+
+    if not jreq.get('n_tx'):
+        logger.critical(json.dumps(jreq))
         return dict_btc
 
-    # print(json.dumps(jreq))
     dict_btc['n_tx'] = jreq['n_tx']
     dict_btc['total_received'] = float(jreq['total_received'] / 100000000)
     dict_btc['total_sent'] = float(jreq['total_sent'] / 100000000)
     dict_btc['final_balance'] = float(jreq['final_balance'] / 100000000)
 
     for transaction in jreq['txs']:
-        for input in transaction['inputs']:
-            if 'addr' in input['prev_out']:
-                if input['prev_out']['addr'] != bitcoin_address:
-                    set_btc_in.add(input['prev_out']['addr'])
+        for t_input in transaction['inputs']:
+            if 'addr' in t_input['prev_out']:
+                if t_input['prev_out']['addr'] != bitcoin_address:
+                    set_btc_in.add(t_input['prev_out']['addr'])
         for output in transaction['out']:
             if 'addr' in output:
                 if output['addr'] != bitcoin_address: