Using Paper Wallet, Important things to know about Paper Wallet
Paper wallets are a handy little store of a private key offline. Unfortunately, many people seem to misunderstand one of the fundamentals of how they work, and subsequently lose vast amounts of money. Storage in a paper wallet is completely safe, retrieving the funds from one is less so.In typical use, a paper wallet would be retrieved into a client using the importprivkey command, and from there it should be assumed at the paper wallet is completely useless. From the moment the first transaction is made, the paper wallet is empty, this is due to the way to the way that the client handles change.Lets explore this with an example.Let's imagine that I send the full contents of my paper wallet (5BTC) to a new address, once I have imported it to bitcoin-qt.
+-------+
| paper |
+-------+
|
|
|
V
+--------------------+
| destination (5BTC) |
+--------------------+
This is the expected behaviour, my paper wallet now contains 0 bitcoin, and the receiving address contains 5BTC.This time, I am going to send 1BTC to an address from my 5BTC wallet, and keep 4BTC in my paper wallet for later.
+-------+
| paper |
+-------+
|
+------------------------+
| |
V V
+--------------------+ +---------------+
| destination (1BTC) | | change (4BTC) |
+--------------------+ +---------------+
Unfortunately this isn't how bitcoin works. There is now nothing in my paper wallet, and 4BTC has been moved to a new "change" address. If you wish to keep this amount in an offline address than, you must create a new paper wallet for this change.The mistake people have made in the past is to import a paper wallet with 100BTC in it, spend one or two, and then assume that the paper wallet still holds 98BTC. This situation is only an issue if you re-import a wallet and expect the funds to remain on it. This issue doesn't apply if you are using your wallet normally.Hope this saves people some serious hassle, and money.
#bitcoin
how to get it for free, can you explain
https://tools.bitcoin.com/paper-wallet/
use this link to get it.
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