If that's the case, then how does it work? What are they validating the human response against? For any similar turing test to work, the answer must be known ahead of time to validate the human's input. I always thought ReCaptcha used the first word for validation and the second word as the donation.
That's exactly how it does it. That's what Bitt's referring to. OCR has failed on the word that ReCAPTCHA doesn't know.
And I'm not sure it's always the first word. I think they mix it up so you don't know. But I do notice that sometimes it's obvious which is which.
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