AnalysisPolicySeptember 21, 2026

Critics call Google SynthID a "spymark" that tracks users

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Google's SynthID-O variant can encode a 136-bit payload in a 512x512 image — enough for a 64-bit database identifier plus 72 bits of error correction, per Google's own SynthID-Image paper. The essay argues such hidden signals make users' work traceable without consent, and that OpenAI and other companies are building similar systems.

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