A method for a system includes forming within an app running upon a user smart-device, an ephemeral ID having data associated with a server and anonymous data, outputting the ephemeral ID to a first receiver associated with a first computer and to a second receiver associated with a second computer system separate from the first, receiving from the first receiver an identifier and a nonce, providing the identifier and the nonce to the server, receiving from the server a token associated with the first computer system authorizing access to the first computer system but not the second computer system by the user smart-device, storing the token for facilitated authentication of the user smart-device, and providing the token to the first receiver.