/**
* Create a key for the account ID or video ID to prevent third party from sending
* spoofed callback requests.
* @param $video_id
* @return string containing hash
*/
public static function get_auth_key_for_id($video_id)
{
$hash = hash('sha256', BC_Utility::salt() . $video_id);
return substr($hash, 0, 8);
}