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Wallet software is targeted by hackers because of the lucrative potential for stealing bitcoins.[34] A technique called "cold storage" keeps private keys out of reach of hackers; this is accomplished by keeping private keys offline at all times[73][7]: ch. 4  by generating them on a device that is not connected to the internet.[74]: 39  The credentials necessary to spend bitcoins can be stored offline in a number of different ways, from specialized hardware wallets to simple paper printouts of the private key.[7]: ch. 10