The CSI-COP project tries to create an understanding on how far we are being tracked-by-default as we use the Internet visiting websites and apps on our mobile devices. CSI-COP engages citizen scientists to address the growing concerns in society around privacy issues, and the methods that attempt to ensure integrity in the collection and use of data. CSI-COP’s community of citizen scientists will be a) fully trained to explore cookies and apps for embedded trackers, b) supported throughout their research, CSI-COP citizen scientists will investigate cookies on websites they normally visit, and apps on smart devices they use daily, and c) encouraged to record and report to the CSI-COP consortium the number and types of trackers they uncover in cookies and apps. The unique findings on digital trackers uncovered by the citizen scientists will be systematically mapped by CSI-COP consortium producing a taxonomy of trackers. The tracker taxonomy will be used to create an online repository. The repository will be available as an open-access knowledge resource on trackers embedded in cookies and apps. The knowledge resource will be a tool useful for a variety of stakeholders including data protection researchers, GDPR compliance regulators, tech journalists, software developers, parents, teachers, higher education curriculum developers, and any organisation that provides computers for public use such as libraries.