Browser Fingerprinting
A passive identification technique that combines browser, OS, GPU, font, and hardware signals to identify a unique device without cookies.
Browser fingerprinting derives a stable device identifier from dozens of passive signals: User-Agent, language, screen resolution, timezone, GPU, installed fonts, canvas-rendering quirks, audio-context output, WebRTC IPs, and more. Fraud-detection vendors (Sift, FingerprintJS, Sardine, Castle) use the fingerprint to link multiple accounts to the same physical device — which is how Amazon, Stripe, and PayPal detect and shut down "linked" accounts even when the email, IP, and address all differ.
Also known asDevice Fingerprint, Canvas Fingerprint
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