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Why do IP-based fraud rules fail against VPNs and proxies?

An IP address is trivial to change: attackers rotate commercial VPNs, datacenter proxies, and residential-proxy networks so every request looks like a fresh, clean location. IP-based rules either block real users on shared IPs or wave attackers through on a rotated one. cside looks past the IP at the device: it draws on 250+ browser, device, and network signals, detects the VPN or residential-proxy use, and still recognises the underlying device across IP changes, incognito, and cleared cookies.

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