AnonCaptcha Addon
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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