Thanks! I like the way you think.

2. I think encrypting PGP is pretty heavy and maybe not great for the performance of a script that loads on a lot of websites.

3. I'm not sure how fast this will be. Especially on a very busy website with lots of page views per second.

Basically you could also store a variable with the event and send that variable back. What would be the added value to use PGP encryption?