diff --git a/webarchiv.py b/webarchiv.py
index 4a60fcdc68dad976ab951140bd6e9d3ae615918a..58a09f70fbe9e35f4ccf5db8b8693df9543f72ba 100644
--- a/webarchiv.py
+++ b/webarchiv.py
@@ -1,6 +1,7 @@
 import sys
 import time
 import requests
+import hashlib
 from requests import HTTPError
 
 _datetime_format_string = '%Y%m%d%H%M%S'
@@ -45,8 +46,9 @@ class WebarchivSession:
         """
         return 'HTTP ERROR - status code {status_code}\n----\n{response_text}\n----\n\n'
 
-    def __init__(self, api_key):
+    def __init__(self, api_key, allow_tracking=False):
         self.api_key = api_key
+        self.allow_tracking = allow_tracking
         self.token = None
 
     def connect(self):
@@ -59,12 +61,21 @@ class WebarchivSession:
             self._display_http_error(e)
 
     def _authenticate(self):
+        if self.allow_tracking:
+            from uuid import getnode as get_mac
+            mac = get_mac()
+            sha256 = hashlib.sha256()
+            sha256.update(str(mac).encode('utf-8'))
+            fingerprint = sha256.hexdigest()
+        else:
+            fingerprint = ''
+
         r = requests.post(self.base_url.format('authentication'),
                           data='''{{
                               "apikey": "{api_key}",
-                              "fingerprint": "string",
+                              "fingerprint": "{fingerprint}",
                               "version": "{version}"
-                          }}'''.format(api_key=self.api_key, version=self.version),
+                          }}'''.format(api_key=self.api_key, version=self.version, fingerprint=fingerprint),
                           headers={
                               'content-type': 'application/json',
                               'accept': 'application/ld+json'