Definition of "histories" Records of every URL submitted and accessed by a given IP address+browser fingerprint^1 1. Archive.today sites use a form of "pixel

Definition of "histories" Records of every URL submitted and accessed by a given IP address+browser fingerprint^1 1. Archive.today sites use a form of "pixel tracking" to collect IP addresses via popular graphical browsers, the ones that are required to be used to solve CAPTCHAs, that automatically request URLs in HTML tags with the "src" attribute, e.g., "img" tags 2. Archive.today sites serve CAPTCHAs to some users^3 which force them to enable Javascript and share browser information 3. For example, those users not using or appearing to use popular graphical browsers