Cryptocurrency Scam A technique called "cold storage" keeps private keys out of reach of hackers; this is accomplished by keeping private keys offline at all times by generating them on a device that is not connected to the internet.[78]: 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  ch. 10 Hardware wallets A hardware wallet is a computer peripheral that signs transactions as requested by the user.

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