When you follow a link to a prop firm, the click is recorded before the page opens. This is how FirmFax knows how much traffic it sends each firm, which is the basis of every commercial arrangement described on the disclosure page.
What a record contains: the time, the firm, which page and which button sent you, the account size or plan the link referred to, the referring site’s hostname, a two-letter country from the request, and whether the device was a phone, tablet or desktop.
What it does not contain: your IP address, your browser’s user-agent string, your email address, or any cookie. To count returning visitors within a single day without keeping any of that, a one-way fingerprint is derived from the request and a secret, mixed with the date. It cannot be reversed into an address or a device, and because the date is part of it, it stops matching at midnight UTC. There is no way to follow anyone from one day to the next.
Automated traffic, such as search-engine crawlers and link previews, is recorded and marked as such, so it can be kept out of any figure quoted to a firm.