diff --git a/src/client.py b/src/client.py
--- a/src/client.py
+++ b/src/client.py
@@ -4,6 +4,7 @@ import logging as log
 from datetime import datetime
 
 import config as conf
+import stats
 from util import Progress
 from hashtree import HashTree
 from networkers import NetworkReader,NetworkWriter
@@ -53,6 +54,7 @@ class Client:
 				jsonData,binData=incoming.readMsg()
 				assert jsonData["index"]==i
 				assert jsonData["dataType"]=="hash"
+				stats.logExchangedNode()
 
 				if localTree.store[i]!=binData:
 					if 2*i+3<len(localTree.store): # inner node
@@ -82,6 +84,7 @@ class Client:
 				log.info("block #{0}: {1}...{2}".format(i2,binData[:5],binData[-5:]))
 
 				outcoming.writeMsg(jsonData,binData)
+				stats.logTransferredBlock()
 				jsonData,binData=incoming.readMsg()
 				assert jsonData["command"]=="ack" and jsonData["index"]==i2, jsonData
 				i1=i2
diff --git a/src/morevna.py b/src/morevna.py
--- a/src/morevna.py
+++ b/src/morevna.py
@@ -3,6 +3,7 @@ import os.path
 from argparse import ArgumentParser
 
 import config as conf
+import stats
 from hashtree import HashTree
 from client import Client
 from server import Server
@@ -28,6 +29,8 @@ def update(args):
 	c=Client(args.datafile)
 	blocksToTransfer=c.negotiate()
 	c.sendData(blocksToTransfer)
+	print()
+	print(stats.report())
 
 def serve(args):
 	_checkFile(args.datafile)
diff --git a/src/networkers.py b/src/networkers.py
--- a/src/networkers.py
+++ b/src/networkers.py
@@ -1,5 +1,7 @@
 import json
 
+import stats
+
 
 class NetworkReader:
 	def __init__(self,stream):
@@ -8,15 +10,22 @@ class NetworkReader:
 	def readMsg(self):
 		data=self.stream.readline()
 		assert data
+		stats.logReceived(data)
 		jsonLength=int(data.split(b":")[1].strip()) # "json-length: length" -> length
+
 		data=self.stream.readline()
 		assert data
+		stats.logReceived(data)
 		binLength=int(data.split(b":")[1].strip()) # "bin-length: length" -> length
+
 		jsonData=self.stream.read(jsonLength)
 		assert len(jsonData)==jsonLength
+		stats.logReceived(jsonData)
 		jsonData=json.loads(str(jsonData,encoding="utf-8"))
+
 		binData=self.stream.read(binLength)
 		assert len(binData)==binLength
+		stats.logReceived(binData)
 		
 		return (jsonData,binData)
 		
@@ -26,8 +35,10 @@ class NetworkWriter:
 		self.stream=stream
 
 	def writeMsg(self,*args):
-		self.stream.write(self.prepMsg(*args))
+		msg=self.prepMsg(*args)
+		self.stream.write(msg)
 		self.stream.flush()
+		stats.logSent(msg)
 
 	def prepMsg(self,jsonData,binData=b""):
 		jsonData=bytes(json.dumps(jsonData)+"\n",encoding="utf-8")
diff --git a/src/stats.py b/src/stats.py
new file mode 100644
--- /dev/null
+++ b/src/stats.py
@@ -0,0 +1,28 @@
+class Stats:
+	received=0
+	sent=0
+	exchangedNodes=0
+	transferredBlocks=0
+
+
+def logReceived(data):
+	Stats.received+=len(data)
+
+
+def logSent(data):
+	Stats.sent+=len(data)
+
+
+def logExchangedNode():
+	Stats.exchangedNodes+=1
+
+
+def logTransferredBlock():
+	Stats.transferredBlocks+=1
+
+
+def report():
+	return """received {r}B
+sent {s}B
+exchanged {nodes} hash tree nodes
+transferred {blocks} blocks""".format(r=Stats.received, s=Stats.sent, nodes=Stats.exchangedNodes, blocks=Stats.transferredBlocks)