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Do a startup that puts news on the blockchain. Include SHA512 of pictures and video of eyewitnesses of said piece of news.

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I actually had a similar idea to discourage certain news outlets from posting inflammatory but misleading or untrue headlines and articles for clicks, and then later changing them to something more factually correct after the damage has been done.

What if a deepfake got in your blockchain?

Good point, but at least for now, video deepfakes can still be detected via machine learning.

Also, deepfakes work well for replacing faces, but not yet for synthesizing actual videos of complex scenes (like crowds) :

https://www.youtube.com/watch?v=IMZkLVBhcig

But then you're right, it won't take long before that's possible. Whether we can continue sniffing out deepfakes with ML is unclear.

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