According to Cloudflare, it takes only three clicks to validate the cryptographic personality certificate, compared to ten or so with traditional captchas. The provider indicates that its service is however limited for the moment to English-speaking regions. In its current state, the solution only works with a handful of physical tokens, but they are all members of the FIDO alliance: YubiKeys, HyperFIDO and Thetis FIDO U2F.
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