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This idea has already been explored, here's one implementation: https://proofofexistence.com/ https://proofofexistence.com/

• Kinnard 11y ago
  Hmmm, I'd say not quite. That's a precursor though, sure.
• j_s 11y ago
  Thanks for the pointer; this might work if it had a vetted API for grabbing content online and signing it.