Show HN: Replacing CAPTCHAs with adaptive proof-of-work in WordPress

A WordPress plugin replaces traditional CAPTCHAs with an invisible proof-of-work system that silently runs a cryptographic challenge in visitors' browsers, blocking spam bots without requiring any user interaction like image puzzles or checkboxes. The plugin works universally across all WordPress forms—including logins, comments, WooCommerce, and major form builders like Contact Form 7 and Gravity Forms—by recognizing form submission signatures rather than relying on specific integrations. This approach eliminates the friction of traditional anti-spam methods while maintaining protection by making spam bots consume excessive computing power to attack the site.