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Antoine Vastel is joining Castle as Head of Research
Bot detection is broken. Attackers have moved far beyond basic bot scripts—they’re leveraging AI, residential proxies, and sophisticated
The Castle blog
Research and insights on stopping modern bots and fraud
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Understanding disposable emails
Disposable email addresses are temporary inboxes that allow users to receive messages without linking the address to a long-term identity.
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How dare you trust the user agent for bot detection?
In every HTTP request, the user agent header acts as a self-declared identity card for the client—typically a browser—
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Why traditional bot detection techniques are not enough, and what you can do about it
Bots are often used to conduct attacks at scale. They can be used to automatically test stolen credit cards, steal
Analyzing anti-detect browsers: How to detect scripts injected via CDP in Chrome
This is the third article in our series on anti-detect browsers. In our previous article, we analyzed Undetectable, a widely
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Bot detection 101: How to detect bots In 2025?
The good old days where bots used PhantomJS and could be detected because they didn’t support basic JavaScript features
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How to detect Headless Chrome bots instrumented with Playwright?
Headless Chrome bots powered by Playwright have become a go-to tool for bot developers due to their flexibility and efficiency.
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How to detect Headless Chrome bots instrumented with Puppeteer?
Headless Chrome bots powered by Puppeteer are a popular choice among bot developers. The Puppeteer API’s ease of use,
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Anti-detect browser analysis: How to detect the Undetectable browser?
This is the second article of our series about anti-detect browsers. In the first article, we gave an overview of
Research
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Overview of anti-detect browsers
This is the first article of a series about anti-detect browsers. In this article, we provide an overview of anti-detect
Antoine Vastel is joining Castle as Head of Research
Bot detection is broken. Attackers have moved far beyond basic bot scripts—they’re leveraging AI, residential proxies, and sophisticated
Research
·
Detecting noise in canvas fingerprinting
In a previous blog post, we talked about canvas fingerprinting, a technique commonly used to detect fraudsters and bots. In
Research
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The role of WebGL renderer in browser fingerprinting
Browser fingerprinting leverages different JavaScript attributes related to the user's device, OS, and browser. When it comes to