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Services like this do exist already, Airbnb uses one for passport verification. But would you sign up to a dating site or app that requires you to upload a copy of your passport?

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Not exactly a passport. But more of an "I uploaded this image first on the internet therefore it's mine."

Oh sorry, I misunderstood... Yes that could work, but you'd have to rely on all the big companies using it too. Getting something like Match.com to use it sounds like quite a challenge :)

Or I photoshopped it enough that your filter can't see it is the same and therefore it is now mine (this is easier than you think).

Also images uploaded on Facebook aren't public by default, so tinyeye etc wouldn't have them.

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