title: How can users prove a specific account has access to BigQuery? (AEAD encryption and authorized views)
body: <p>I'm running an event where multiple people need to access BigQuery, and I want them to send me a proof that they have access:</p>
  
  <ul>
  <li>I want to collect email addresses of participants that can access BigQuery.</li>
  <li>I want proof that they have used BigQuery.</li>
  </ul>
  
  <p>How can a user prove that their specific email account has access to BigQuery? </p>
  
  <p>I'm wondering if we could build a solution with authorized views and encryption functions. </p>