https://altcha.org/
Privacy-First Captcha and Bot Protection | ALTCHA
ALTCHA is a next-gen Captcha and bot protection solution for websites and apps, designed for privacy, accessibility, and compliance.
privacy firstbot protectioncaptchaaltcha
https://verygoodalternatives.com/altcha
Altcha Alternatives - 11 Other Captcha Options
Looking for an alternative to Altcha? Discover 11 other captcha tools and find the perfect solution for your needs.
altchaalternativescaptchaoptions
https://advisories.gitlab.com/npm/altcha-lib/CVE-2025-68113/
ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay | GitLab Advisory Database (GLAD)
CVE-2025-68113 ALTCHA Proof-of-Work Vulnerable to Challenge Splicing and Replay: A cryptographic semantic binding flaw in ALTCHA libraries allows challenge...
proof of workto challengealtchavulnerablesplicing
https://pub.dev/documentation/altcha_widget/latest/
altcha_widget - Dart API docs
altcha_widget API docs, for the Dart programming language.
api docsaltchawidgetdart