Eddystone-EID uses rotating ephemeral identifiers to broadcast a more secure beacon signal, which works across Android and iOS devices. After registering your beacons on a compatible Eddystone-EID platform, beacons can send encrypted and rotating IDs synchronously through the platform. Thereby, despite the fact that the ID is constantly changing, your app will be able to consult an Ephemeral ID to get a unique and registered ID, in order to execute a specific action. More info click here.