The list of approvals is the heart of privaceasy: from here you can monitor the situation of each individual contact, check if you have seen your privacy policy and what are your preferences regarding the approval boxes you set.
You can also detect from which tool or touch-point (contacts form, landing page, webservice, QR Code, information paper privacy) a contact has last updated their preferences and understand what kind of activities you can perform.
By detecting when the last update was performed, the tool and possibly the ip address used, you will always be able to prove the correct application of GDPR.