Comment by VoidWhisperer

I'm a little confused here from the explanation and examples - how is this anonymous exactly? The examples require that you pass their 'changefly user id' and ip address. Both of these are fairly unique identifiers (especially when combined). The mention in the developer documentation that you may prompt them for the user's changefly PIN in the case of an IP address mismatch implies that you are storing the user's IP in some form or another - so basically users are having to trust that you aren't storing information about these 'changefly connections'. This is just one further hop from having the government provide this service themselves, since if they really wanted to, what is stopping them from coming to you and saying 'I want a list of all websites that user at X ip address did age verification on'?