Nothing here is shown to anyone who knows only your e-mail address.
The key is the code the form showed you when you sent it. Each form you send shows a new key, and each key opens only the details sent with it.
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No key, and no joined browser? Give your e-mail address and say what you want. The hub answers by e-mail, to that address only. This page answers the same whether or not details are held.
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What the hub keeps about a visit