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Anthropic's Claude Code uses hidden date markers to track users

Anthropic's coding tool, Claude Code, has been found to embed a hidden tracking mechanism within its system prompts. A reverse-engineer discovered that the tool subtly alters characters in the date string sent to the AI model, creating a covert mark. This mark is designed to identify resellers, unofficial gateways, and potentially those attempting to train copycat models by analyzing network information and user configurations. AI

IMPACT Raises concerns about user privacy and trust in AI tools, potentially impacting adoption despite Anthropic's claims of it being an anti-abuse measure.

RANK_REASON Discovery of a hidden tracking feature in a specific AI product.

Read on dev.to — Anthropic tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Anthropic's Claude Code uses hidden date markers to track users

COVERAGE [1]

  1. dev.to — Anthropic tag TIER_1 English(EN) · Breach Protocol ·

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

    <p>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…