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A comment on mCaptcha – Proof of work based, privacy respecting CAPTCHA system. Parent comment
There are protections against replay attacks within mCaptcha: tokens are single use also have a lifetime beyond which they are invalid.
Disclosure: author of mCaptcha
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There are protections against replay attacks within mCaptcha: tokens are single use also have a lifetime beyond which they are invalid.
Disclosure: author of mCaptcha