> CoinHive Captcha was a proof-of-work captcha based on in-browser crypto mining, discontinued in 2019. Learn what it did and why it should be removed. > > Canonical: https://www.flowconsent.com/en/services/security/coinhive-captcha Security # CoinHive Captcha Essential · [Official website](https://coinhive.com) CoinHive Captcha was a captcha from the Coinhive service, which made the visitor's browser compute cryptocurrency hashes (Monero) as proof of work instead of solving a puzzle. Coinhive shut down in 2019, so the script no longer works. Any remaining reference should be removed, since in-browser mining used visitor resources and was widely blocked as unwanted software. [Block CoinHive Captcha until consent](https://app.flowconsent.com/auth/sign-up?utm_source=flowconsent.com\&utm_medium=referral\&utm_campaign=security) · [Scan my site](https://www.flowconsent.com/en/scan) At a glance - Category [Security](https://www.flowconsent.com/en/services/security) - Consent Essential - Prior consent Required - Documented cookies 0 Compliance ## CoinHive Captcha and the GDPR CoinHive Captcha is classified as “Essential”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy. Cookies and trackers ## What CoinHive Captcha sets and contacts The cookies of CoinHive Captcha are not documented in the catalog yet. To see what is actually set on your site, run a free scan. 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