1d
1device
Stable, signed, hard-to-spoof identification — client + edge fingerprinting on Cloudflare
Visitor ID
collecting signals…
Re-check
Clear cookie & re-identify
Confidence
–
stable signals contributing
Identification
Client signals
Edge / network
Fingerprint hash
–
stable
SHA-256 over normalized client + edge signals. The visitor id is an HMAC-SHA256 of this hash keyed by a server secret, so it cannot be forged client-side.