set default fee to 0.5mBTC/kb

gui/qt/main_window.py

@@ -2570,7 +2570,8 @@ class ElectrumWindow(QMainWindow):
         widgets.append((nz_label, nz, nz_help))
 
         fee_label = QLabel(_('Transaction fee per kb') + ':')
-        fee_help = HelpButton(_('Fee per kilobyte of transaction.') + '\n' + _('Recommended value') + ': ' + self.format_amount(10000) + ' ' + self.base_unit())
+        fee_help = HelpButton(_('Fee per kilobyte of transaction.') + '\n' \
+                              + _('Recommended value') + ': ' + self.format_amount(bitcoin.RECOMMENDED_FEE) + ' ' + self.base_unit())
         fee_e = BTCAmountEdit(self.get_decimal_point)
         fee_e.setAmount(self.wallet.fee_per_kb)
         if not self.config.is_modifiable('fee_per_kb'):

lib/bitcoin.py

@@ -38,8 +38,10 @@ except ImportError:
 
 ################################## transactions
 
+DUST_THRESHOLD = 5430
 MIN_RELAY_TX_FEE = 1000
-
+RECOMMENDED_FEE = 50000
+COINBASE_MATURITY = 100
 
 # AES encryption
 EncodeAES = lambda secret, s: base64.b64encode(aes.encryptData(secret,s))

lib/wallet.py

@@ -39,8 +39,6 @@ import bitcoin
 from synchronizer import WalletSynchronizer
 from mnemonic import Mnemonic
 
-COINBASE_MATURITY = 100
-DUST_THRESHOLD = 5430
 
 
 # internal ID for imported account
@@ -163,8 +161,7 @@ class Abstract_Wallet(object):
         self.addressbook           = storage.get('contacts', [])
 
         self.history               = storage.get('addr_history',{})        # address -> list(txid, height)
-
-        self.fee_per_kb            = int(storage.get('fee_per_kb', 10000))
+        self.fee_per_kb            = int(storage.get('fee_per_kb', RECOMMENDED_FEE))
 
         # This attribute is set when wallet.start_threads is called.
         self.synchronizer = None