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Bitcoin Forum > Bitcoin > Technical Support (Moderator: achow101) > I've lost 50.04 coins, and recovered them. How could it be possible?
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legkodymov
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March 12, 2011, 06:30:57 AM
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I've had disk crash recently, which caused wallet loss. I was 50.04 coins on it

But I have backup copy of it with zero balance, so I restored my wallet.

To my supprise 50.04 coins appeared again. Is this really possible? Did bitcoin downloaded my coins from network?

Thank you!
Anatoly.
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March 12, 2011, 06:40:11 AM
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All you need to spend your coins is your private keys which are in your wallet.dat file. One copy will work as well as another.

You don't really download the coins. It's more like you download a list of which addresses contain coins and the your software notices "Hey, that's an address I have the key for" and tells you the total balance of all such addresses.
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March 12, 2011, 06:57:14 AM
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Quote from: legkodymov on March 12, 2011, 06:30:57 AM
I've had disk crash recently, which caused wallet loss. I was 50.04 coins on it

But I have backup copy of it with zero balance, so I restored my wallet.

To my supprise 50.04 coins appeared again. Is this really possible? Did bitcoin downloaded my coins from network?

Thank you!
Anatoly.

Yes, and your wallet file has pre-generated keys for future use too.  So that backup could restore future lost coins you have not yet even received, if you were to suffer another crash.
Companies claiming they got hacked and lost your coins sounds like fraud so perfect it could be called fashionable.  I never believe them.  If I ever experience the misfortune of a real intrusion, I declare I have been honest about the way I have managed the keys in Casascius Coins.  I maintain no ability to recover or reproduce the keys, not even under limitless duress or total intrusion.  Remember that trusting strangers with your coins without any recourse is, as a matter of principle, not a best practice.  Don't keep coins online. Use paper or hardware wallets instead.
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March 12, 2011, 09:55:57 AM
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Quote from: legkodymov on March 12, 2011, 06:30:57 AM
To my supprise 50.04 coins appeared again. Is this really possible? Did bitcoin downloaded my coins from network?

Additional information:

  http://en.bitcoin.it/wiki/Key_pool

  https://www.bitcoin.org/smf/index.php?topic=1414.0
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