Spot Device
Spot Device is that distributes spot signature
to visitors via proximity wireless communication between the Spot Device and the visitor's client allows them to exchange signatures with each other. In addition, Spot Device is not connected to the Internet and exists as a stand-alone device. So it cannot receive signatures over the network. After all, having a signature distributed by Spot Device is proof that a visitor has visited Spot Device, the specific location. Spot device distribute signature as Proof of Visit for visitors. Visitors travel with the spot device as their destination. The visitor communicates with the spot device and receives his/her own personalized spot signature. This spot signature is only available to the visitor.
The NFC card contain of ECDSA pair keys( aka private key and public key).
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