#c2pa
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How to Hack Time, With C2PA
Security researcher David Buchanan produced a photo bearing a cryptographically "unforgeable" C2PA timestamp proving he knew the winning lottery numbers hours before the draw. The whole trick turns on one quirk of the C2PA spec.
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Anthropic launches a tool for checking whether files “came from Claude”
Anthropic has unveiled a browser-based tool that determines whether a file was created or processed with Claude — using embedded, cryptographically signed metadata based on the C2PA standard.
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Paint and Photos quietly tag locally generated images with a server-issued GUID
A reverse engineer discovered that Microsoft Paint and Photos embed an invisible watermark into the pixels of AI images — a unique identifier that betrays a remote prompt-moderation server.