diff --git a/client.py b/client.py
old mode 100644
new mode 100755
--- a/client.py
+++ b/client.py
@@ -24,6 +24,9 @@ nodeStack=collections.deque([0]) # root
 incoming=networkReader.output # synchronized message queue
 outcoming=networkWriter.input
 
+# initialize session
+jsonData={"command":"init", "blockSize":localTree.BLOCK_SIZE, "blockCount":localTree.leafCount}
+outcoming.put((jsonData,b""))
 
 # determine which blocks to send
 while len(nodeStack)>0: