diff --git a/lib/blockchain.py b/lib/blockchain.py
index 45ecdfbb..4b66424e 100644
--- a/lib/blockchain.py
+++ b/lib/blockchain.py
@@ -63,19 +63,6 @@ def deserialize_header(f, height):
     h['block_height'] = height
     return h
 
-# def deserialize_header(f, height):
-#     h = {}
-#     h['version'] = struct.unpack("<I", f.read(4))[0]
-#     h['prev_block_hash'] = hash_to_str(f.read(32))
-#     h['merkle_root'] = hash_to_str(f.read(32))
-#     h['hash_reserved'] = hash_to_str(f.read(32))
-#     h['timestamp'] = struct.unpack("<I", f.read(4))[0]
-#     h['bits'] = struct.unpack("<I", f.read(4))[0]
-#     h['nonce'] = hash_to_str(f.read(32))
-#     h['n_solution'] = base64.b64encode(bytes(deser_char_vector(f))).decode('utf8')
-#     h['block_height'] = height
-#     return h
-
 def sha256_header(header):
     return uint256_from_bytes(Hash(serialize_header(header)))
 
@@ -199,8 +186,8 @@ class Blockchain(util.PrintError):
             prev_header = self.read_header(index * NetworkConstants.CHUNK_SIZE - 1)
 
         for i in range(num):
-            raw_header = data[i*bitcoin.HEADER_SIZE:(i+1) * bitcoin.HEADER_SIZE]
-            header = deserialize_header(raw_header, index*NetworkConstants.CHUNK_SIZE + i)
+            raw_header = data[i * bitcoin.HEADER_SIZE : (i + 1) * bitcoin.HEADER_SIZE]
+            header = deserialize_header(raw_header, index * NetworkConstants.CHUNK_SIZE + i)
             self.verify_header(header, prev_header)
             prev_header = header
 
diff --git a/lib/network.py b/lib/network.py
index 2416a40d..194d03e3 100644
--- a/lib/network.py
+++ b/lib/network.py
@@ -950,15 +950,18 @@ class Network(util.DaemonThread):
     def init_headers_file(self):
         b = self.blockchains[0]
         filename = b.path()
-        open(filename, 'wb+').close()
-        self.downloading_headers = False
-        return
-        
-        print(b.get_hash(0), NetworkConstants.GENESIS)
-        if b.get_hash(0) == NetworkConstants.GENESIS:
+
+        if NetworkConstants.TESTNET:
+            if not os.path.exists(filename) or b.get_hash(0) != NetworkConstants.GENESIS:
+                open(filename, 'wb+').close()
+            with b.lock: b.update_size()
             self.downloading_headers = False
             return
         
+        if b.get_hash(0) == NetworkConstants.GENESIS:
+            self.downloading_headers = False
+            return
+
         def download_thread():
             try:
                 import urllib, socket
@@ -981,7 +984,6 @@ class Network(util.DaemonThread):
         t.start()
 
     def run(self):
-        print('zzzzzzzzzzzzzzzzzzzz')
         self.init_headers_file()
         while self.is_running() and self.downloading_headers:
             time.sleep(1)
diff --git a/lib/util.py b/lib/util.py
index b4ae9508..6f5c4398 100644
--- a/lib/util.py
+++ b/lib/util.py
@@ -614,7 +614,7 @@ class SocketPipe:
                 if err.errno == 60:
                     raise timeout
                 elif err.errno in [11, 35, 10035]:
-                    print_error("socket errno %d (resource temporarily unavailable)"% err.errno)
+                    # print_error("socket errno %d (resource temporarily unavailable)"% err.errno)
                     time.sleep(0.2)
                     raise timeout
                 else: