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@TheAlgur_twitter - If you need to verify if someone has custody over an address, then require the user to(pre) sign a message of your choice, then run ecrecover to see if it matches with the sender. If they can, then they definitely have custody of the private key.
Maybe you can explain a bit more about what you are doing, as I still find it a little vague.
The code mockup above was done in vb.net. :)