We have been describing creating and spending a paper wallet as if it were a top secret Area 51 procedure. It is wise to be secure around money. One needs to use the Private Key for a cryptographic signature in order to sweep the paper wallet of bitcoin. Someone could be looking over your shoulder. If you imported the Private Key to an online wallet, a hacker might grab it. If you sweep the account on a bitcoin wallet client, there is the danger that a hacker is recording your keystrokes, moves faster and sweeps your account before you do.
The mere fact the Private Key exists means it can ultimately be compromised.
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