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Cover Your Tracks (formerly Panopticlick)

How Unique - and Trackable - Is Your Browser?


The easiest way to set up an instance of Cover Your Tracks is with docker and docker-compose, but it can be installed on a host machine if desired.

Partial Installation on Host

You may need to install libmysqlclient-dev and python3.11-dev for Debian-based systems.

pip install pipenv
pipenv --python 3.11
pipenv install

Then modify the relevant variables in

Now, you can run

pipenv run python

Full Docker Installation

To generate self-signed certificates for the Cover Your Tracks hosts, cd into examples/nginx and run


Change each of the secrets in docker/secrets/ to a random value.

Then, from the git root, run

docker-compose up

Admin Routes

The following routes allow you to perform administrative tasks on the application. For each of the following curl commands, be sure to change the password to what you've set as the admin password in your or docker-compose.yml file. Remove the --insecure flag in production.

POST /refresh-key

To have the application re-read the keyfile, which contains the key to the HMAC function for storing IP addresses, issue the following command:

curl -X POST -H 'Content-Type: application/json' -d '{"password": "changeme"}' --insecure

POST /migrate-db

To migrate the database to the latest version of the application, issue the following command:

curl -X POST -H 'Content-Type: application/json' -d '{"password": "changeme"}' --insecure

POST /epoch-update-totals

To update the totals table to reflect the number of times we've seen each fingerprinting characteristic in the last epoch (45 days), issue the following command:

curl -X POST -H 'Content-Type: application/json' -d '{"password": "changeme"}' --insecure

Viewing Locally

Unless you've changed the server names specified in, you'll have to add the following line to your /etc/hosts file:

If you generated the certs yourself, in Firefox you'll have to go into private browsing mode to see the "I Understand the Risks" dialogue. You may also have to manually go to each of the above domains and go through the certificate exception process for each one in order for the application to be fully functional. Or with chrome, you can start chrome with the --ignore-certificate-errors flag, but beware this will ignore all certificate errors.


This project is licensed under the Affero General Public License, version 3. See the LICENSE file for details.


This is a rewrite of the original Cover Your Tracks codebase, developed by Peter Eckersley at the Electronic Frontier Foundation. Currently maintained by William Budington.