diff --git a/res/ui/currency_tab.ui b/res/ui/currency_tab.ui
index 8218af48ed277e794265950b98bfee2f45e6fd16..c41d3366ce4f03aa3d1a49733be23aa38b86922e 100644
--- a/res/ui/currency_tab.ui
+++ b/res/ui/currency_tab.ui
@@ -100,6 +100,13 @@
      </layout>
     </widget>
    </item>
+   <item>
+    <widget class="QLabel" name="label_current_block">
+     <property name="text">
+      <string/>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources>
diff --git a/src/cutecoin/core/app.py b/src/cutecoin/core/app.py
index ea365405cef8b24f5f4197f907bcb6ad58796305..8546bb17dfeba0a18d2de1ada9d595b73c64cc35 100644
--- a/src/cutecoin/core/app.py
+++ b/src/cutecoin/core/app.py
@@ -121,7 +121,6 @@ class Application(object):
                     tar.getmember(obj)
                 except KeyError:
                     raise BadAccountFile(file)
-                    return
             tar.extractall(path)
 
         account_path = os.path.join(config.parameters['home'],
diff --git a/src/cutecoin/core/community.py b/src/cutecoin/core/community.py
index f7ec25dd95932df2e8a2be736462614acafd669f..1f83bb477ef084a901100c30f2ae58f42ec7da27 100644
--- a/src/cutecoin/core/community.py
+++ b/src/cutecoin/core/community.py
@@ -114,9 +114,10 @@ class Community(object):
                                    "number": block['number']}
             elif self.last_block["request_ts"] < time.time() - 300:
                 block = bma.blockchain.Current(e.conn_handler()).get()
-                self.last_block = {"request_ts": time.time(),
-                                   "number": block['number']}
-                self.requests_cache = {}
+                if block['number'] > self.last_block['number']:
+                    self.last_block = {"request_ts": time.time(),
+                                       "number": block['number']}
+                    self.requests_cache = {}
 
             cache_key = (hash(request),
                          hash(tuple(frozenset(sorted(req_args.keys())))),
diff --git a/src/cutecoin/core/wallet.py b/src/cutecoin/core/wallet.py
index 4d65c372ee2778e03838ff9b49869a5b5d24f154..0d395ec587510aabeecbeefab31dfbccfb7b8f0b 100644
--- a/src/cutecoin/core/wallet.py
+++ b/src/cutecoin/core/wallet.py
@@ -91,17 +91,15 @@ class Cache():
 
                 in_inputs = [i for i in tx.issuers if i == self.wallet.pubkey]
                 if len(in_inputs) > 0:
-                    logging.debug("TX:{0}".format(tx.compact()))
                     # remove from waiting transactions list the one which were
                     # validated in the blockchain
-                    confirmed_tx = [awaiting for awaiting in self.awaiting_tx
-                                         if awaiting.compact() == tx.compact()]
-                    for c in confirmed_tx:
-                        logging.debug("Awaiting:{0}".format(c.compact()))
                     self.awaiting_tx = [awaiting for awaiting in self.awaiting_tx
                                          if awaiting.compact() != tx.compact()]
                     self.tx_sent.append(tx)
 
+        self.tx_sent = self.tx_sent[:50]
+        self.tx_received = self.tx_received[:50]
+
         self.latest_block = current_block['number']
 
 
diff --git a/src/cutecoin/gui/community_tab.py b/src/cutecoin/gui/community_tab.py
index e17f8ae74f5d9fb6092caf4e2e675293824d5a2b..045387904647846942c3be47bdd506ef31b153af 100644
--- a/src/cutecoin/gui/community_tab.py
+++ b/src/cutecoin/gui/community_tab.py
@@ -59,7 +59,7 @@ class CommunityTabWidget(QWidget, Ui_CommunityTabWidget):
             send_money.triggered.connect(self.send_money_to_member)
             send_money.setData(member)
 
-            certify = QAction("Certify individual", self)
+            certify = QAction("Certify identity", self)
             certify.triggered.connect(self.certify_member)
             certify.setData(member)
 
diff --git a/src/cutecoin/gui/currency_tab.py b/src/cutecoin/gui/currency_tab.py
index 46fec4a2e0e139586bacf920219aeaf6821466bd..df6adf0b179d3064633bdad4f33136dede1a0699 100644
--- a/src/cutecoin/gui/currency_tab.py
+++ b/src/cutecoin/gui/currency_tab.py
@@ -5,14 +5,15 @@ Created on 2 févr. 2014
 '''
 
 import logging
+from ucoinpy.api import bma
 from PyQt5.QtWidgets import QWidget, QMenu, QAction, QApplication
-from PyQt5.QtCore import QModelIndex, Qt
+from PyQt5.QtCore import QModelIndex, Qt, pyqtSlot
 from PyQt5.QtGui import QIcon
-from cutecoin.gen_resources.currency_tab_uic import Ui_CurrencyTabWidget
-from cutecoin.gui.community_tab import CommunityTabWidget
-from cutecoin.models.sent import SentListModel
-from cutecoin.models.received import ReceivedListModel
-from cutecoin.models.wallets import WalletsListModel
+from ..gen_resources.currency_tab_uic import Ui_CurrencyTabWidget
+from .community_tab import CommunityTabWidget
+from ..models.sent import SentListModel
+from ..models.received import ReceivedListModel
+from ..models.wallets import WalletsListModel
 from ..models.wallet import WalletListModel
 
 
@@ -30,6 +31,8 @@ class CurrencyTabWidget(QWidget, Ui_CurrencyTabWidget):
         self.setupUi(self)
         self.app = app
         self.community = community
+        self.tab_community = CommunityTabWidget(self.app.current_account,
+                                                    self.community)
 
     def refresh(self):
         if self.app.current_account is None:
@@ -42,11 +45,40 @@ class CurrencyTabWidget(QWidget, Ui_CurrencyTabWidget):
                 SentListModel(self.app.current_account, self.community))
             self.list_transactions_received.setModel(
                 ReceivedListModel(self.app.current_account, self.community))
-            tab_community = CommunityTabWidget(self.app.current_account,
+            self.tab_community = CommunityTabWidget(self.app.current_account,
                                                     self.community)
-            self.tabs_account.addTab(tab_community,
+            self.tabs_account.addTab(self.tab_community,
                                      QIcon(':/icons/community_icon'),
                                     "Community")
+            block_number = self.community.request(bma.blockchain.Current)['number']
+            self.label_current_block.setText("Current Block : {0}".format(block_number))
+
+    @pyqtSlot(int)
+    def refresh_block(self, block_number):
+        if self.list_wallet_content.model():
+            self.list_wallet_content.model().dataChanged.emit(
+                                                 QModelIndex(),
+                                                 QModelIndex(),
+                                                 [])
+        if self.list_wallet_content.model():
+            self.list_transactions_sent.model().dataChanged.emit(
+                                                     QModelIndex(),
+                                                     QModelIndex(),
+                                                     [])
+
+        if self.list_transactions_received.model():
+            self.list_transactions_received.model().dataChanged.emit(
+                                                         QModelIndex(),
+                                                         QModelIndex(),
+                                                         [])
+
+        if self.tab_community.list_community_members.model():
+            self.tab_community.list_community_members.model().dataChanged.emit(
+                                                           QModelIndex(),
+                                                           QModelIndex(),
+                                                           [])
+
+        self.label_current_block.setText("Current Block : {0}".format(block_number))
 
     def refresh_wallets(self):
         wallets_list_model = WalletsListModel(self.app.current_account,
@@ -65,7 +97,6 @@ class CurrencyTabWidget(QWidget, Ui_CurrencyTabWidget):
         model = self.list_wallets.model()
         if index.row() < model.rowCount(None):
             wallet = model.wallets[index.row()]
-            logging.debug(wallet)
             menu = QMenu(model.data(index, Qt.DisplayRole), self)
 
             rename = QAction("Rename", self)
diff --git a/src/cutecoin/gui/mainwindow.py b/src/cutecoin/gui/mainwindow.py
index ad505cd28e88a6b884c92f458333de53090d58f9..8add61f6d72d7bab2802a9e74616f82aadbc93d6 100644
--- a/src/cutecoin/gui/mainwindow.py
+++ b/src/cutecoin/gui/mainwindow.py
@@ -5,7 +5,7 @@ Created on 1 févr. 2014
 '''
 from cutecoin.gen_resources.mainwindow_uic import Ui_MainWindow
 from PyQt5.QtWidgets import QMainWindow, QAction, QFileDialog
-from PyQt5.QtCore import QSignalMapper, QModelIndex
+from PyQt5.QtCore import QSignalMapper, QModelIndex, QThread, pyqtSignal
 from PyQt5.QtGui import QIcon
 from cutecoin.gui.process_cfg_account import ProcessConfigureAccount
 from cutecoin.gui.transfer import TransferMoneyDialog
@@ -14,7 +14,34 @@ from cutecoin.gui.add_contact import AddContactDialog
 from cutecoin.gui.import_account import ImportAccountDialog
 from cutecoin.gui.certification import CertificationDialog
 
+from ucoinpy.api import bma
+
 import logging
+import time
+
+
+class BlockchainInspector(QThread):
+    def __init__(self, community):
+        QThread.__init__(self)
+        self.community = community
+        self.exiting = False
+        self.last_block = self.community.request(bma.blockchain.Current)['number']
+
+    def __del__(self):
+        self.exiting = True
+        self.wait()
+
+    def run(self):
+        while not self.exiting:
+            time.sleep(10)
+            current_block = self.community.request(bma.blockchain.Current)
+            if self.last_block != current_block['number']:
+                logging.debug("New block, {0} mined in {1}".format(self.last_block,
+                                                                   self.community.currency))
+                self.new_block_mined.emit(current_block)
+                self.last_block = current_block['number']
+
+    new_block_mined = pyqtSignal(int)
 
 
 class MainWindow(QMainWindow, Ui_MainWindow):
@@ -97,6 +124,9 @@ class MainWindow(QMainWindow, Ui_MainWindow):
             self.currencies_tabwidget.clear()
             for community in self.app.current_account.communities:
                 tab_currency = CurrencyTabWidget(self.app, community)
+                bc_inspector = BlockchainInspector(community)
+                bc_inspector.new_block_mined.connect(tab_currency.refresh_block)
+                bc_inspector.start()
                 tab_currency.refresh()
                 self.currencies_tabwidget.addTab(tab_currency,
                                                  QIcon(":/icons/currency_icon"),