Deep linking of mobile apps by barcode, sound or collision

A system of a first mobile device, Alpha, running an app, and a second mobile device, Beta, running another instance of the app;

• where Alpha makes a deep link with an address of an app server;
• where the deep link has an identifier of assets in the app that Alpha wishes to trade;
• where Alpha encodes the deep link in a barcode;
• where Beta decodes the barcode;
• where Beta contacts the app server with a portion or entirety of the deep link;
• where the server sends Beta a description of the assets;
• where Alpha and Beta trade assets.

A system of a first mobile device, Alpha, and a second mobile device, Beta;

• where Alpha runs an app;
• where the app makes a deep link;
• where the deep link has an address of an app server;
• where the deep link has an identifier of the app;
• where Alpha uploads the deep link to an audio server;
• where the audio server returns an audio signal;
• where Alpha plays the audio signal;
• where Beta decodes the audio signal;
• where Beta contacts the audio server;
• where Beta gets the deep link;
• where Beta contacts the app server with a portion or entirety of the deep link;
• where Beta installs the app.

A system of a mobile device near an electronic screen;

• where the screen is controlled by a controller on the Internet;
• where the screen shows a barcode encoding a deep link;
• where the deep link points to an app server on the Internet;
• where the mobile device scans and decodes the barcode;
• where the mobile device uses the deep link to query the app server;
• where the app server returns a first data to the mobile device;
• where the app server sends a second data to the controller;
• where the controller uses the second data to alter the screen.