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FACT CHECK #WQCRYEU_

07/02/26 · 2:01 AM UTC · 10 SOURCES

“Claude Code sends metadata such as timezone, proxy settings, and possible AI Lab connections into the system prompt.”
TRUE ✓

HIGH CONFIDENCE

TL;DR ·Claude Code reportedly uses steganography to embed user timezone and proxy data in system prompts.

WHAT WE FOUND

Recent technical analyses and reports confirm that Claude Code monitors environment variables and system metadata to identify connections linked to Chinese infrastructure . When the variable ANTHROPIC_BASE_URL is set, the tool extracts the user's system timezone and the hostname of the custom API proxy being used . This metadata is compared against lists containing 147 Chinese corporate and AI lab domains, including entities like Baidu, ByteDance, Moonshot AI, and MiniMax . Instead of standard telemetry, this information is transmitted via steganography within the Today's date is... line of the system prompt . For example, if a Chinese timezone or proxy is detected, the date separator may shift from a hyphen to a slash (e.g., 2026/07/02), or other subtle formatting changes are applied to signal the user's origin to the model . Anthropic has reportedly acknowledged the behavior and promised a fix following public discovery .

SOURCES

  1. 1 · internationalcyberdigest.comWEB
    Claude Code accused of hiding China proxy fingerprints inside system prompts

    TIER B

  2. 2 · kucoin.comWEB
    Claude Code Accused of Hiding China Proxy Fingerprints in System Prompts | KuCoin

    TIER B

  3. 3 · techstartups.comWEB
    Anthropic’s Claude Code accused of hiding proxy fingerprints inside system prompts to identify China-linked users - Tech Startups

    TIER B

  4. 4 · eu.36kr.comWEB
    Confirmed: Claude Code Secretly Accesses User Data - Time Zones and Chinese AI Labs as Key Targets

    TIER B

  5. 5 · techtimes.comWEB
    Claude Code Hid Proxy Fingerprints in System Prompts: Anthropic Promises Fix

    TIER B

  6. 6 · news.ycombinator.comWEB
    Anthropic has embedded hidden spyware-like code in Claude Code | Hacker News

    TIER B

  7. 7 · digg.comWEB
    Anthropic's Claude Code is accused of quietly ...

    TIER B

  8. 8 · aimadetools.comWEB
    Claude Code Is Steganographically Marking Requests: What It Means

    TIER B

  9. 9 · github.comWEB
    GitHub - Piebald-AI/claude-code-system-prompts: All parts of Claude Code's system prompt, 27 builtin tool descriptions, sub agent prompts (Plan/Explore/Task), utility prompts (CLAUDE.md, compact, statusline, magic docs, WebFetch, Bash cmd, security review, agent creation). Updated for each Claude Code version. · GitHub

    TIER B

  10. 10 · cybersecuritynews.comWEB
    Anthropic's Claude Code Reportedly Uses Hidden Code to Detect Chinese Users

    TIER B

VERDICT TOTALTRUE ✓
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