Industry
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Reverse proof of work: How AI changed hiring signals
I hire a handful of engineers and researchers every year at Castle. That is not enough to make me a
Antoine Vastel
Antoine is currently the Head of Research at Castle. In this role, he focuses on improving Castle's bot detection engine using different approaches, including behavioral detection, and fingerprinting.
Latest
La majorité du trafic internet n’est pas humaine: comprendre les bots
🇫🇷Note: This blog post is written in French. I’m publishing it alongside a video I did with Micode, a
Research
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What sits behind a “private” proxy network
NexaProxies describes itself as a “Private proxy network. Access by invitation only.” That wording made us curious. Does “private” also
Industry
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Two chicken nuggets and a Claude account
A few days ago I saw a screenshot on X of someone talking to what looks like a McDonald'
Industry
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While anti-bot vendors talk about AI agents, classical bots are getting the bypasses
⚠️ A quick disclaimer on AI agent management AI agents will clearly change how people interact with websites. They will search,
Industry
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Will prediction markets turn your platform into a bot target?
Prediction markets can give bots a direct financial incentive to manipulate online metrics. TL;DR Prediction markets such as Polymarket
Research
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Ant traps, fraud graphs, and the cost of blocking too soon
I recently had an ant problem in my apartment. At first, it looked simple. We saw ants coming through the
SMS verification abuse at scale: releasing our open source disposable phone number list
A few weeks ago, we released an open source list of disposable email domains observed in real abuse activity: https:
Research
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Inside the infrastructure behind fake signups: our open source disposable email domain list
Disposable email addresses are a foundational piece of infrastructure for online abuse. Just like proxies help attackers distribute traffic and
Research
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You thought your growth was working. It wasn’t.
You just got a Slack webhook notification. You have 3 new users who created an account on your SaaS: * john.
Research
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Introducing Castle’s Research Team
How we think about research at Castle Bot detection and fraud prevention are adversarial by default. It is a cat-
Research
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Inside a bot operator’s email verification infrastructure
During an investigation into a large-scale automated account creation attack targeting one of our customers, we observed a burst