Abstract: A near field magnetically coupled contactless device includes a foldable substrate in the form of a tape; two metal surfaces located facing each other on opposite sides of the substrate in a region of interest of the substrate, configured such that a piercing of the region of interest causes a permanent short circuit between the two metal surfaces; and a circuit configured to detect a short circuit between the two metal surfaces.

Abstract: A method for securing the sale of an item (OB), including steps of storing item identifier (PCA) and owner identifier (UID) by a server (BSRV) and in a secure memory of electronic tag (TG) linked to item, transmitting item identifier, from electronic tag to a terminal (SP1) through contactless or near field link, providing by the server information (PINF) relative to item (OB) in response to a request (VFRQ) designating item, transmitting to server an update request identifying the owner, containing information relative to the new owner of item, storing by the server the information relative to new owner in relation with item identifier, generating by the server a write request (EID) containing an identifier (UID) of new owner, transmitting write request to electronic tag through contactless or near field link, and storing in the electronic tag the identifier of new owner received in write request.

Abstract: A near field magnetically coupled contactless device, comprises a foldable substrate in the form of a tape; an antenna circuit tuned to a nominal frequency, including an antenna and a capacitor connected to the antenna; a sacrificial impedance connected to the antenna circuit to contribute to the tuning of the antenna circuit to the nominal frequency; and a sacrificial structure comprising a conductive track connecting the sacrificial impedance to the antenna circuit, configured in meanders occupying a region of interest of the substrate such that a piercing of the region of interest severs the conductive track.