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Re:Show HN: URL Canary – Get an alert when someone finds you... by jstanley on Monday March 19, 2018 @12:37PM (#16619806)
Great idea! Might even be possible to sort that out for the user automatically...
Re:Show HN: URL Canary – Get an alert when someone finds you... by mikejarema on Monday March 19, 2018 @01:33PM (#16620627)
The bit.ly approach might result in false positives as the namespace for bit.ly links is quite easy to iterate over (assuming you don't use a custom link).

Also, doesn't bit.ly access a URL to pull a title or generate a preview? This would send a click through to the canary as well.