An app to keep track of all the handshakes. Arriving from Austria, where the Red Cross is working to Stop the Crown. The mechanism is quite simple: by using the application, the user can keep track of all the subjects with which he has had close contact. In the time they were acquiring the infection by Coronavirus, Stopp Crown inquire all those with whom it came into contact: the objective is to lessen the pressure on health authorities. Some doubt as to the respect of privacy: the recording would be the case, anonymous, but to contact any close contacts will have to enter their personal data.