> wouldn't my IP address change often enough that this wouldn't be useful for more than a couple of days? Yes, that’s right. But your IP and all the other litt

> wouldn't my IP address change often enough that this wouldn't be useful for more than a couple of days? Yes, that’s right. But your IP and all the other little atoms of data that are collected on you by various third parties are traded back and forth to form a rich web. Over time the value of any given data point (like your ephemeral DHCP lease) becomes less significant to the integrity of the picture that has been created of you.