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Code Issues Releases Wiki Activity

clarified paper wallet spending warning to better explain risk of key exposure from compromised computer. See reported errata #151303

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Andreas M. Antonopoulos 2015-01-18 10:51:28 -05:00
parent 684911ae60
commit 078b630030
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@ -1005,7 +1005,7 @@ image::images/msbt_0415.png[]
[WARNING]
====
((("paper wallets","spending")))((("private keys","exposing with paper wallets")))Although you can deposit funds into a paper wallet several times, you should withdraw all funds only once, spending everything. This is because in the process of unlocking and spending funds, you expose the private key, and because some wallets might generate a change address if you spend less than the whole amount. One way to do this is to withdraw the entire balance stored in the paper wallet and send any remaining funds to a new paper wallet.
((("paper wallets","spending")))((("private keys","exposing with paper wallets")))Although you can deposit funds into a paper wallet several times, you should withdraw all funds only once, spending everything. This is because in the process of unlocking and spending funds some wallets might generate a change address if you spend less than the whole amount. Additionally, if the computer you use to sign the transaction is compromised, you risk exposing the private key. By spending the entire balance of a paper wallet only once, you reduce the risk of key compromise. If you need only a small amount, send any remaining funds to a new paper wallet in the same transaction.
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Paper wallets come in many designs and sizes, with many different features. Some are intended to be given as gifts and have seasonal themes, such as Christmas and New Year's themes. Others are designed for storage in a bank vault or safe with the private key hidden in some way, either with opaque scratch-off stickers, or folded and sealed with tamper-proof adhesive foil. Figures pass:[<xref linkend="paper_wallet_bpw" xrefstyle="select: labelnumber"/>] through pass:[<xref linkend="paper_wallet_spw" xrefstyle="select: labelnumber"/>] show various examples of paper wallets with security and backup features.