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A checksum for one's state of mind, to test for outside tampering

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I do that in a way, like "huh, you say I did what? I do not remember that and it's inconsistent with my then-principles"

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I learned about implanted memories early and I often think about ways of checksumming to defend against that

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it's not so high up my threat model but it's nice to have something against gaslighting and plain old wishful thinking