Form with a pre-filled hidden field

I am sending people a form URL to gather some information and I need to keep track of which entries belong to which responder. My idea is to have a responder ID column that is pre-filled for them, but I do not want the responders to be able to see or modify it. I also need the “Require login” privacy setting to OFF because the responders do not have coda accounts. Is this feasible ?

You can prefill hidden fields - at that point the value is only visible in the URL in the users browser

But sadly you can’t hide it more than that

Here’s a quick video that breaks down prefilling fields

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