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Re:Show HN: URL Canary – Get an alert when someone finds you... by cottsak on Monday March 19, 2018 @10:45PM (#16625603)
But it demonstrates nothing if no one clicks. The channel may be insecure, compromised and no one knows - not the author or the parties who are supposed to have the secrets.

I see what he's trying to do, but this isn't the way I don't think. Mathematical proofs that verify that a payload is observed, opened, or accessed work. They are deterministic. They are also way more complex. I think this is trying to solve a problem in a simple way but it's still just as nondeterministic as without this solution IMO.

Re:Show HN: URL Canary – Get an alert when someone finds you... by imglorp on Tuesday March 20, 2018 @07:59AM (#16627724)
Absolutely. But if you have the choice between a) not knowing 100 pct of the time, and b) knowing for certain it's not private X pct of the time, for unknown X probably not 0, you'd want b. You will have more information by trying.