In a previous article, 9 Device Fingerprinting Solutions for Developers, I outlined a set of open source and commercial solutions for device fingerprinting. What I didn't dig into in that article is how the fingerprints are actually used in preventing fraud.One misconception is that a fingerprint alone ... Read More

Hi 👋 – I'm the founder of Castle, a developer-first fraud prevention platform that helps you automatically collect and analyze a user’s location based on location indicators–one of many features available.In this post, I delve into various methods for predicting user location and ... Read More

As the availability of unique IPs and user agents wanes and cookie reliability remains half-baked at best, device fingerprinting has emerged as a serious contender in the battle against online fraud and abuse ... Read More

IntroductionWith the rise of online tracking, proxy and VPN services have become a popular way to protect people's privacy. However, these digital shields also provide an opportunity for bad actors to hide their suspicious activity. This is where "proxy piercing" comes in. It's ... Read More

Castle is a real-time rules engine designed to manage fraud and risk across all touchpoints, including onboarding, login, payment, and content sharing experiences. We're excited to announce a new feature that will help you dramatically speed up fraud investigations; instant link analysis, which empowers you to quickly visualize ... Read More