> I doubt this is useful as a proof in the way one might wish (that is, proving that a web server delivered content X at date Y). The reason is, it does not app

> I doubt this is useful as a proof in the way one might wish (that is, proving that a web server delivered content X at date Y). The reason is, it does not appear that anything prevents the user from modifying the web page and then generating a "proof" about the modified version. Thanks for saying it so clearly, this is exactly the first thing I thought (and it reduces the value of the functionality by heaps, since everything can be forged).