@spmatich @ibk @phoebematich
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On challenge we retrieve a copy of the hash, hash the purported original picture/record again, and compare the two.
Now, there are digital signatures for who as well as for what, and we can hash collections of hashes and so on, but it rapidly becomes plausible to the intelligent that the record is as submitted. Or occasionally, that it isn't.
Survivors from when "crypto" meant secret writing, not money and scams, can go on for hours about this because …
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