diff --git a/pybtc/connector/utxo.py b/pybtc/connector/utxo.py
index a8d1fb7..1e1afdb 100644
--- a/pybtc/connector/utxo.py
+++ b/pybtc/connector/utxo.py
@@ -48,6 +48,7 @@ class UTXO():
 
         self.save_process = True
         try:
+            self.log.critical("cached " + str(len(self.cached)) )
             checkpoint = self.checkpoints.pop()
             lb = 0
             block_changed = False