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Cheap Fakes #2

There's an episode of Columbo where the villain uses a photo of a face and a speed camera to establish an alibi.

Columbo enlarges the photos and finds that the shadows are inconsistent. He is able to do this because the photos are ordered by time on a single a roll.

Parallels to blockchains are pretty obvious. Each photo is directly linked to the previous/next photo and there are timestamps involved...

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