开发者开源了一款WordPress插件，采用自适应工作量证明技术（基于Hashcash）替代传统CAPTCHA来防御垃圾邮件 1。该方案通过增加垃圾邮件发送者的计算成本来提高其攻击难度，同时保护用户隐私且无需运行费用 1。
插件自2022年以来已在4000多个活跃安装中投入运营 1。压缩后体积仅14 KB，采用GPL-2.0许可证发布 1。该插件支持80多种主流表单生成器和主题的初始配置 1，开发者声称实现了100%的垃圾邮件拦截率，同时不会误阻正常用户提交 1。因不依赖Cookie且符合欧盟数据隐私法规，该方案在隐私保护方面具有优势 1。
A developer has open-sourced a WordPress plugin that replaces traditional CAPTCHAs with an adaptive proof-of-work mechanism based on Hashcash technology to combat spam.1 The plugin has been operating across more than 4,000 active installations since 2022.1 Rather than relying on image recognition puzzles, the approach increases computational costs for spammers while maintaining user privacy without requiring fees or cookies.1
The plugin is distributed under a GPL-2.0 license and has a compressed file size of just 14 KB.1 It offers built-in compatibility with over 80 popular form builders and WordPress themes.1 According to the developer, the solution achieves a 100% spam interception rate while allowing legitimate form submissions to proceed unblocked.1 The implementation complies with EU data privacy regulations, as it does not depend on cookies for operation.1
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