HashCash is a WordPress plugin that implements an invisible proof-of-work CAPTCHA to protect forms from spam. It runs cryptographic calculations in the user's browser, requiring no user interaction, no tracking, and no third-party services, ensuring privacy and compliance.
HashCash – Proof of Work CAPTCHA is a Security & compliance platforms product. It focuses on blocking spam on WordPress forms without user friction or third-party tracking. It is built as a B2B product for wordPress site owners seeking privacy-friendly spam protection. HashCash – Proof of Work CAPTCHA is free to use. It runs on the web and embeddable surfaces.
RicheyWeb builds and maintains HashCash – Proof of Work CAPTCHA, and the product first shipped in 2026. PulseGate's similarity index finds few close equivalents — HashCash – Proof of Work CAPTCHA occupies a relatively distinct niche. Key capabilities include Proof-of-work CAPTCHA, invisible spam protection, and no tracking. The interface is available in Dzongkha and English.
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