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there are 2 ways to link - by signign message or by sending BTC.
use electrum maybe

THIS SOUND LIKE THEY SCAM YOUR PASSWORDS THROUGH WALLET :]

believe me its safe, but of course do your own research.

just to be clear - you can have BTC on different computer than this coins wallet. it needs just signing on blockchain, the wallets can be even on different continents ;)

Tricked me into sending $1 in bitcoin to their address