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Is the Witness a person or something else? Can the Witness be faked?

I also have the same questions I had 48 days ago:

https://news.ycombinator.com/item?id=45364282

How would fake content not be able to fake the proof?

What's to prevent fake content from generating cryptographically signed photos and videos that embed a JSON manifest with the same characteristics as this service?

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Without giving away the keys to the kingdom, when someone registers their device to use the app, it creates a few objects on the backend and the device that generate the cryptographic signatures in the content. It's designed to prevent fakes, multiple ways. Install the app to see how it works and the question will answer it self.

Witness is the app.

Reply on news.ycombinator.com