Block countries you are not allowed to serve
GeoIP at the edge or in PHP, applied to earning and signup rather than to content, with a message that says what happened.
Tagged “signup”
3 entries
Attribute a referral with a cookie and a window
First touch or last touch, a window that expires, and the check that stops a user referring themselves.
Verify a Cloudflare Turnstile token server-side
The widget on the page proves nothing on its own. This is the server check, written to fail closed on every error path.