Core is programmed to decide which block chain contains valid transactions. It is recommended that outside of self-generated vanity addresses, users should never import (or export) private keys.
Once you have your private key if you had to unlock your wallet you can relock it by exiting or typing: walletlock, once you have this you can go to niwallet. So before you do anything else backup the wallet. Open Debug Window, then go to menu: /Help/Debug Window and click on the tab - Console. You have to enter a passphrase before you can send) unlock it by typing walletpassphrase "your walletpassphrase here" 600 dumpprivkey your Bitcoin address here, this will return the private key which will start with the number. The 600 means your wallet is unlocked for 10 minutes (600 seconds). Click on ' debug window select the ' console ' tab, if your wallet is protected by a passphrase (i.e. In the console at the very bottom is a text entry box.
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