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Another potential use of blockchain technology. When an image is first captured, the time and a fingerprint generated from it will be recorded in a public blockchain that can't be tampered with. Then we can disregard images that don't have valid dates that match when the image was supposed to have been recorded.

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All this will do is encourage the proliferation of innumerable bespoke blockchains, created by parties interested in stamping legitimacy on illegitimate content. Each of these blockchains will be presented as equivalent to "the blockchain" with respect to being trustworthy proofs of original untampered content timestamps.

"We" can, but 99.99% of the public won't.

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