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How to get your Coins
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type dumpprivkey "insertyouraddresshere" and copy the result.
Then in the XUC wallet
HELP--> DEBUG WINDOW --> CONSOLE
type importprivkey "yourprivatekeyhere",
Why do not use signmessage?
signmessage
Sign a message with the private key of an address
You can prove ownership of an address using signmessage yes...but how will you redeem them?