Observed Signal · May 11, 2026 · Product Launch · Source: DEV Community · Impact: 3/5 · Sentiment: Positive
Proof-of-Work CAPTCHA Removes Cookies
A Dev.to engineering post (published 2026-05-11) describes building captchaapi.eu, a cookie-free CAPTCHA that replaces cross-site profiling and cookies with a client-side proof-of-work (PoW) challenge. The protocol issues a seed and difficulty target; the client finds a nonce via SHA-256 iterations and submits it for server verification. The implementation uses server-side Redis (2-minute TTL) for challenge state and pseudonymised IP hashing for short-term rate limiting, runs PoW in a Web Worker to avoid UI blocking, and ships a small open-source widget (~19 KB minified, ~7 KB gzipped). The author positions this as a GDPR-friendlier alternative to solutions that rely on cross-site cookies and global risk scoring (e.g., Google reCAPTCHA), while noting trade-offs versus ML-based behavioural scoring and advanced botnets.
Presents a privacy-preserving, technically viable alternative to cookie-based CAPTCHAs that reduces cross-site profiling and GDPR/compliance overhead for EU SaaS — relevant to identity, consent and bot mitigation strategies in the ecosystem, but originates from a small project rather than a major platform.
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Key Takeaways & Evidence Grounding
- Author built captchaapi.eu as a cookie-free CAPTCHA service using a proof-of-work protocol
- PoW protocol: server issues seed + difficulty; client iterates SHA-256(seed || counter) and submits nonce for server re-hash verification
- Server-side implementation uses Redis for ephemeral challenge state with a 2-minute TTL and pseudonymised IP hashes (SHA-256(IP || server-secret-salt)) for rate limiting
- Widget size ~19 KB minified and ~7 KB gzipped; PoW runs inside a Web Worker to avoid freezing the main thread
- Measured median PoW solve times: ~20 ms on Mac mini M4 and ~63 ms on iPhone, with total end-to-end ~234 ms driven by network RTT
- Free tier of captchaapi.eu covers 5,000 challenges per month
Connected Companies & Entities
2 Entities mappedOntology Mapping & Concepts
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Claude + Playwright Automate CAPTCHA-Heavy Signups
A developer describes an AI-powered browser agent that uses Anthropic's Claude as the reasoning layer and Playwright as the execution layer to automate account signups on CAPTCHA-heavy sites. The agent sends a structured DOM snapshot (not screenshots) to Claude to decide the next single browser action, uses an init script to patch navigator/browser fingerprints, and runs a prioritized CAPTCHA decision tree (including 2captcha and anti-captcha services). The system logs strategy outcomes to a SQLite `browser_memory` table, learns across sessions, and relies heavily on residential proxies for IP reputation. The author packaged the implementation into a reusable "Claude Browser Agent Starter Kit" available on Payhip and reports measured bypass rates across protection vendors after ~40 attempts.
Fix: 'Enable JavaScript and cookies to continue' Error
A technical how-to explaining why the message 'Enable JavaScript and cookies to continue' appears (typically when Cloudflare or similar security proxies detect missing JavaScript execution or cookies) and practical fixes for end users and developers. The article describes Cloudflare’s JavaScript challenge and verification cookies (e.g., __cf_bm, cf_clearance), recommends using headless browsers with JS/cookie support (Playwright, Selenium, Puppeteer) for automation, warns against raw HTTP requests (requests/curl) for sites enforcing JS challenges, and notes alternative but fragile approaches such as using cloudscraper. Publication date: 2026-08-22.
Google launches unified agentic AI for Gemini
At a Google Cloud event on Thursday, Google announced it is bringing agentic AI to its Gemini assistant, launching a unified agent that can autonomously plan and execute tasks on behalf of users. Aimed initially at businesses, the agent can connect to internal systems and external tools, use custom skills, and even choose from third-party models like Anthropic's Claude. It will have its own Workspace account with an email address, and will write its own audit trail. Early testers include On, Shopify, and PayPal. Gemini has over 1 billion monthly active users, and nearly 90% of Fortune 100 companies use Gemini Enterprise.
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