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Claude Code was quietly fingerprinting requests through a hidden mark in the date

A reverse-engineer discovered that Anthropic's coding tool, Claude Code, embeds a hidden tracking mark in the system prompt it sends to its AI model. The mark uses look-alike Unicode characters in the date line — a curly apostrophe instead of a straight one, a slash instead of a dash — enabling Anth

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Claude Code was quietly fingerprinting requests through a hidden mark in the date

Deep Analysis

Multi-Source Intelligence

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Claude Code was quietly fingerprinting requests through a hidden mark in the date

Deep Analysis

Multi-Source Intelligence

Related Stories

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