Tagged: hcaptcha

hCaptcha's challenge pipeline: from sitekey to passcode and the proof-of-work layer

Traces hCaptcha end to end: the sitekey and api.js widget, the getcaptcha challenge fetch, the hsw proof-of-work stamp, the h-captcha-response passcode redeemed at siteverify, and the Privacy Pass token path.

hcaptcha captcha anti-bot proof-of-work

Sat, May 9, 2026 · 21 min read

hCaptcha vs reCAPTCHA: a technical comparison of detection and challenge design

A head-to-head technical comparison of hCaptcha and reCAPTCHA: how each scores traffic, where their score scales invert, the image-challenge design, the privacy split, and the 2020-era migrations that put hCaptcha on millions of sites.

hcaptcha recaptcha captcha anti-bot

Fri, May 8, 2026 · 20 min read