future_block.patch

diff --git a/ethereum/pow/chain.py b/ethereum/pow/chain.py
index 45f856e..1c6ea4e 100644
--- a/ethereum/pow/chain.py
+++ b/ethereum/pow/chain.py
@@ -81,7 +81,6 @@ class Chain(object):
             self.genesis = self.get_block_by_number(0)
         self.time_queue = []
         self.parent_queue = {}
-        self.localtime = time.time() if localtime is None else localtime
 
     # Head (tip) of the chain
     @property
@@ -220,11 +219,15 @@ class Chain(object):
 
         return score
 
+    def get_time(self):
+        return time.time()
+
     # This function should be called periodically so as to
     # process blocks that were received but laid aside because
     # they were received too early
     def process_time_queue(self, new_time=None):
-        self.localtime = time.time() if new_time is None else new_time
+        if not new_time:
+            new_time = self.get_time()
         i = 0
         while i < len(self.time_queue) and self.time_queue[i].timestamp <= new_time:
             log.info('Adding scheduled block')
@@ -235,7 +238,7 @@ class Chain(object):
 
     # Call upon receiving a block
     def add_block(self, block):
-        now = self.localtime
+        now = self.get_time()
         # Are we receiving the block too early?
         if block.header.timestamp > now:
             i = 0