Invisible Anti-Spam & CAPTCHA - Proof-of-Work spam protection for WordPress
Show HN: Replacing CAPTCHAs with adaptive proof-of-work in WordPress
Invisible Anti-Spam & CAPTCHA replaces traditional CAPTCHAs with a silent proof-of-work challenge that runs in the visitor's browser in milliseconds. No puzzles, no checkboxes, no user interaction. It protects every WordPress form — logins, registrations, comments, WooCommerce checkout, and virtually any form plugin — by recognizing submissions through their signature rather than plugin-specific integrations. The plugin is self-contained, needs no API keys or external services, and keeps all data on your server. It includes adaptive under-attack mode, brute-force protection, and a direct analysis mode to teach it custom forms in under a minute. Lightweight, privacy-friendly, and free.
Instead of making humans prove themselves, it makes the device pay. The visitor's browser proves it is a real, JavaScript-running client by doing a moment of invisible computation. Zero friction for people, real costs for bots.
- drfuchs
Interesting to note that the original invention of Proof Of Work was motivated by anti-spam in particular ("Pricing via Processing or Combatting Junk Mail" Dwork & Naor, Advances in Cryptology — CRYPTO' 92).
- Velocifyer
https://trycap.dev/ existed the whole time, and does not need wordpress.
- fennecbutt
Hmmmm. Is this the compute economy that Altman was going on about.