title: NFC listener trigger based on tag
body: <p>I am doing a research on NFC and its use, I've started with a simple proof of concept by creating an NFC application for Android. When tag is scanned, it sends REST request with tag's ID to see whether it is registered with the service, and if is, content is downloaded and played on the phone. </p>
  
  <p>The problem is tags' ID are sequential, the requirement is to have some unique random information stored to avoid possible complications and security issues. The question is, what should the data be? Is there some standard on the subject?</p>
  
  <p>The idea is to store <code>x,y</code> where <code>x</code> is trigger identifier and <code>y</code> is a random unique number. Would this work? Can custom activity be started based on <code>x</code> value?</p>
  
  <p>Any help and references are appreciated. There will be cake.</p>