$ curl -I https://permanent-redirect.xyz/pages/1515222320 HTTP/1.1 200 OK Date: Fri, 12 Jan 2018 15:07:09 GMT Server: Apache Content-Type: text/html; charset=UTF-8
The idea behind my script is that the URL is encoding the unix time of the first visit to that URL. By starting at the current time and working backwards, the first HTTP 200 you come across should be the current page.