How does uploading a passport prove that you're over a certain age? It's not as if there aren't thousands of pictures of people's passports online already that you could easily download. I really don't see how there's any problem with the current system. The person paying for the internet (who by definition should be over 18) decides if they want to block or allow porn. I don't see how this system is going to be any more effective than that, other than creating another massive hackable database of people's details.