AnonCaptcha Addon
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Adds a math-based captcha for anonymous commenters to prevent spam.

When enabled, anonymous visitors who wish to leave a comment must solve a simple addition problem (e.g. "What is 12 + 37?"). The captcha is generated server-side and signed with an HMAC token, so answers are never exposed in URLs or client-side code.

Based on Zotlabs hook system.

Adapted for Hubzilla 11

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