For each visitor who triggers an event, a unique hash is calculated based on several pieces of info (including shortened IP, user agent). However, we do not store the actual IP. To ensure that this hash is unique, but cannot be traced back to the visitors, we also use a randomly generated string (“salt”) when calculating the hash. This string is not stored permanently at any time and is regenerated every eight hours. This means that every visitor who revisits your site and whose last visit was more than eight hours ago will receive a new hash, even if the IP and user agent remain the same.