diff --git a/contrib/privnet-claim-neo-and-gas.py b/contrib/privnet-claim-neo-and-gas.py
index fb8dded46..85e9641b8 100644
--- a/contrib/privnet-claim-neo-and-gas.py
+++ b/contrib/privnet-claim-neo-and-gas.py
@@ -43,7 +43,6 @@
 from neo.Implementations.Blockchains.LevelDB.LevelDBBlockchain import LevelDBBlockchain
 from neo.Wallets.KeyPair import KeyPair
 from neo.Prompt.Commands.LoadSmartContract import ImportMultiSigContractAddr
-from neo.Prompt.Notify import SubscribeNotifications
 from neo.Core.Blockchain import Blockchain
 from neo.Fixed8 import Fixed8
 from neo.Prompt.Commands.Send import construct_and_send
@@ -301,7 +300,6 @@ def claim_initial_neo(self, target_address):
 
     blockchain = LevelDBBlockchain(settings.LEVELDB_PATH)
     Blockchain.RegisterBlockchain(blockchain)
-    SubscribeNotifications()
 
     reactor.suggestThreadPoolSize(15)
     NodeLeader.Instance().Start()
diff --git a/contrib/privnet-claimall.py b/contrib/privnet-claimall.py
index 96b14c1d2..8e02a27dc 100755
--- a/contrib/privnet-claimall.py
+++ b/contrib/privnet-claimall.py
@@ -33,7 +33,6 @@
 from neo.Implementations.Blockchains.LevelDB.LevelDBBlockchain import LevelDBBlockchain
 from neo.Wallets.KeyPair import KeyPair
 from neo.Prompt.Commands.LoadSmartContract import ImportMultiSigContractAddr
-from neo.Prompt.Notify import SubscribeNotifications
 from neo.Core.Blockchain import Blockchain
 from neo.Fixed8 import Fixed8
 from neo.Core.TX.Transaction import TransactionOutput, ContractTransaction
@@ -232,7 +231,6 @@ def run(self):
     # Setup the Blockchain
     blockchain = LevelDBBlockchain(settings.LEVELDB_PATH)
     Blockchain.RegisterBlockchain(blockchain)
-    SubscribeNotifications()
 
     # Create the claim
     pc = PrivnetClaimall(args.address)
diff --git a/contrib/smartcontract.py b/contrib/smartcontract.py
index 6a3991343..bba6d2083 100644
--- a/contrib/smartcontract.py
+++ b/contrib/smartcontract.py
@@ -1,3 +1,6 @@
+"""
+Smart contract API to easily react to events from specific smart contracts.
+"""
 import time
 
 from collections import defaultdict
@@ -41,7 +44,7 @@ def __init__(self, contract_hash):
         assert contract_hash
         self.contract_hash = str(contract_hash)
 
-        # Register EventHub.events handlers to forward for SmartContract decorators
+        # Handle EventHub events for SmartContract decorators
         @events.on(SmartContractEvent.RUNTIME_NOTIFY)
         @events.on(SmartContractEvent.RUNTIME_LOG)
         @events.on(SmartContractEvent.EXECUTION_SUCCESS)
diff --git a/neo/BigInteger.py b/neo/BigInteger.py
index fbc5d2656..bdeb67188 100644
--- a/neo/BigInteger.py
+++ b/neo/BigInteger.py
@@ -5,6 +5,14 @@
 
 class BigInteger(int):
 
+    @property
+    def Sign(self):
+        if self > 0:
+            return 1
+        elif self == 0:
+            return 0
+        return -1
+
     @staticmethod
     def FromBytes(data, signed=False):
         return BigInteger(int.from_bytes(data, 'little', signed=signed))
diff --git a/neo/VM/InteropService.py b/neo/VM/InteropService.py
index e377e9fe8..9786f072f 100644
--- a/neo/VM/InteropService.py
+++ b/neo/VM/InteropService.py
@@ -258,9 +258,10 @@ def __init__(self, value):
         super(Struct, self).__init__(value)
 
     def Clone(self):
-        newArray = []
+        length = len(self._array)
+        newArray = [None for i in range(0, length)]
 
-        for i in range(0, len(self._array)):
+        for i in range(0, length):
             if self._array[i] is None:
                 newArray[i] = None
             elif self._array[i].IsStruct:
diff --git a/neo/test_numbers.py b/neo/test_numbers.py
index 995c9001b..754d3b439 100644
--- a/neo/test_numbers.py
+++ b/neo/test_numbers.py
@@ -153,6 +153,24 @@ def test_big_integer_frombytes(self):
         self.assertEqual(b1, b2)
         self.assertTrue(b1.Equals(b2))
 
+    def test_big_integer_sign(self):
+
+        b1 = BigInteger(3)
+        b2 = BigInteger(0)
+        b3 = BigInteger(-4)
+        self.assertEqual(b1.Sign, 1)
+        self.assertEqual(b2.Sign, 0)
+        self.assertEqual(b3.Sign, -1)
+
+        c1 = BigInteger(-100)
+        c1_bytes = c1.ToByteArray()
+
+        c2 = BigInteger.FromBytes(c1_bytes, signed=True)
+        self.assertEqual(c2.Sign, -1)
+
+        c2_unsigned = BigInteger.FromBytes(c1_bytes, signed=False)
+        self.assertEqual(c2_unsigned.Sign, 1)
+
 
 class UIntBaseTestCase(NeoTestCase):
     def test_initialization(self):
diff --git a/prompt.py b/prompt.py
index ef78ff373..3e4c29c42 100644
--- a/prompt.py
+++ b/prompt.py
@@ -700,7 +700,7 @@ def configure(self, args):
                     print("smart contract event logging is now enabled")
                     settings.set_log_smart_contract_events(True)
                 if c1 == 'off' or c1 == '0':
-                    print("smart contract event logging is now enabled")
+                    print("smart contract event logging is now disabled")
                     settings.set_log_smart_contract_events(False)
 
             else:
diff --git a/requirements.txt b/requirements.txt
index d663d464b..fb6081684 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,7 +31,7 @@ mmh3==2.5.1
 mock==2.0.0
 mpmath==1.0.0
 neo-boa==0.1.8
-neo-python-rpc==0.1.6
+neo-python-rpc==0.1.8
 numpy==1.13.3
 pbr==3.1.1
 peewee==2.10.2