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I guess you could use a CAPTCHA in lieu of a login when someone first creates a note.

Not really a fan of CAPTCHA. May have some kind of "How many kittens are in the picture"

There is also one where you assemble a puzzle: https://www.keycaptcha.com/

They have varying levels of handicapped accessibility though.

Thanks. Honestly I'm not that concerned about it. If there is a sudden mysterious spike in traffic I may look into it.