Strong timestamps applied at creation. A later fake is obvious. Needs participation from creator (ideally the equipment), but not subjects.
Blockchain is costly snake oil that's not needed here. There are efficient ways to do notaries without blockchain.
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It's cheap and trustless. Example: timestamping the entirety of http://archive.org for ~ $0.90: https://petertodd.org/2017/carbon-dating-the-internet-archive-with-opentimestamps …
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