FeaturedFraud prevention
Paywall Abuse Prevention: Protect Access and Reading Limits
Prevent paywall abuse with server-side entitlements, safe caching and persistent reading limits. Separate content leaks from account sharing.
ShieldLabs Blog
Learn about fraud detection and prevention, device intelligence, bot detection and traffic risk scoring.
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What IP reputation is, and why an IP score alone won't catch fraud
What IP reputation is, how the 0 to 100 score is built, and why a clean IP score alone will not catch fraud. The lagging, shared, and recycled-IP problem.
JA4 fingerprinting explained: how it improves on JA3, and what it actually identifies
What JA4 fingerprinting is, how it fixes JA3's weakness to TLS randomization, the JA4 string format and JA4+ suite, and what it can and cannot identify.
How to detect VPNs in 2026
How to detect VPNs in 2026: the methods that actually work, why an IP check alone fails, and how masked traffic ties to abuse and risk.
Residential proxy detection: why home IPs are the hardest to catch, and how detection actually works
What a residential proxy is, where the home IPs come from, and how residential proxy detection works without relying on the address itself.
What is device fingerprinting? How it works, signals, and uses
What is device fingerprinting: the signals that make up a device fingerprint, how recognition works across browsers, and what teams use it for.
What is browser fingerprinting? Detection methods + countermeasures
Browser fingerprinting identifies a device from 300+ datapoints. Learn how canvas, WebGL, and IP signals work, plus detection methods and countermeasures.
What is canvas fingerprinting? How it works and why it is so stable
Canvas fingerprinting identifies a browser by how it renders a hidden image. How it works, what it reveals, how stable it is, and its role in fraud detection.
How to detect account sharing?
Detect account sharing with device intelligence, login activity and automatic detections. Review device history and account for legitimate multi-device use.
10 browser fingerprinting techniques explained
The main browser fingerprinting techniques: canvas, WebGL, audio, fonts, TLS (JA3/JA4), and more, what each one reads and how stable it is.
Proxy detection for fraud prevention: how to identify hidden traffic sources
How proxy detection works for fraud prevention: 13 techniques, why residential proxies are hard to spot, and why an IP check alone is never enough.
How to detect anti-detect browsers in 2026
Anti-detect browsers fake a new device per profile to power multi-accounting. How to detect them: the signals that expose them and why no one check is enough.