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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
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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'
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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,
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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
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How to authenticate OpenAI Operator requests using HTTP message signatures
Cloudflare recently introduced a new authentication standard, HTTP message signatures, designed to securely verify automated traffic from known bot operators.
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From detection to trust: the evolving challenge of AI bot authentication
This is the second post in our series on AI bots and their impact on fraud and detection systems. In
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From LLM scrapers to AI agents: mapping the AI bot landscape for detection teams
AI bots, AI scrapers, AI agents—you’ve seen these terms thrown around in product announcements, Hacker News posts, and
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Bringing bot detection research to your AI-powered workflow
At Castle, we’ve increasingly embedded LLMs and tools like Cursor into our research workflows, whether we’re prototyping detection
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What browser fingerprinting tests like Amiunique and Browserleaks really show, and what they miss
If you’ve ever visited a site like amiunique.org, browserleaks.com, or pixelscan.net, you’ve probably seen a
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CAPTCHAs 101: what they are, how they work, and where they fall short
CAPTCHAs are the most recognizable anti-bot mechanism on the web. Whether you're logging into a game, signing
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Fake account creation attacks: anatomy, detection, and defense
Fake account creation is one of the most persistent forms of online abuse. What used to be a fringe tactic
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Credential stuffing attacks: anatomy, detection, and defense
Credential stuffing remains one of the most scalable and persistent threats on the internet. While defenders have improved at catching