Using dumpprivkey to make a paper backup


How To Make a Paper Backup of Your Wallet

A simple guide on how to make a paper backup of your wallet

To begin i am doing this in linux but the steps are similar on windows. To do this you will need "litecoind"(the Litecoin deamon) which is packaged with the graphical Ltecoin wallet.

Step One:
The first thing you will need to do is start the Litecoin deamon.You can do this by using the Command Prompt or in my case the Linux shell to Navigate to the file where Litecoind is located and typing:

$ ./litecoind --daemon

it should respond by saying:

Litecoin server starting

If you recieve an error stating:

It is recommended you use the following random password:
(you do not need to remember this password)
If the file does not exist, create it with owner-readable-only file permissions.


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Right now, that's not supported. You can try (see user2194702's answer), but if you don't know the exact workings of the wallet, you're very likely to shoot yourself in the foot.

For example, Bitcoin-Qt will send change to a new address every time you create a transaction, and in general does not follow the "balance per address" concept but a "balance per wallet". This improves the privacy of the system (for you, but also for others), but complicates backups. In particular, you cannot backup a wallet by just making a backup of a single key.

HD Wallets (hierarchical deterministic wallets, see BIP32) are intended to overcome this problem, by making sure you can backup a wallet by only making a backup of a single seed that is used to derive all keys. This is planned to be implemented in Bitcoin-Qt, but not yet...

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One of the most popular options for keeping your bitcoins safe is something called a paper wallet. Here we explain how to transfer all those digital coins into a physical paper form using just a printer.

Note that in this guide we’ll be talking about bitcoin. However, the basic concepts apply to any other cryptocurrency; for example, litecoin.

What is a wallet and why do I need one?

A bitcoin wallet consists of two ‘keys’. The one you’ll already likely be familiar with is the public key, which is your wallet address and is how other people send bitcoins to you.

The other part of your bitcoin wallet is the private key. It is this that enables you to send bitcoins to other people.

The combination of the recipient’s public key and your private key is what makes a cryptocurrency transaction possible.

It is important to understand that, if anyone else obtains the private key of your wallet, they can withdraw your funds – this is why it’s...

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By: Greg Robidoux


The RESTORE VERIFYONLY command checks the backup to ensure it is complete and the entire backup is readable. The does not do an actual restore, but reads through the file to ensure that SQL Server can read it in the event that a restore using this backup needs to occur.


The RESTORE VERIFYONLY option is a good choice to check each backup after the backup has completed. Unfortunately this takes additional processing time for this to complete, but it is a good practice to put in place. Following are ways you can do this with T-SQL and SSMS.


Check a backup file on disk
The following command will check the backup file and return a message of whether the file is valid or not. If it is not valid, this means the file is not going to be useable for a restore and a new backup should be taken. One thing to note is that if there are multiple backups in a file, this only checks the first file.

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I use a three pronged approach:

1) I clone my entire system to an external USB hard drive monthly (or whenver I make any kind of significant change). I use Clonezilla, which I've created a Live USB for. The GUI is primitive, but if you use the defaul "beginner" option, it's actually very straight forward. You can exact replicate of your working system at the time of cloning, and you will be able to just plug the drive into any other machine and boot from it. It's very reliable.

2) I do nightly backups to my home network NAS (could also be done to an external drive). After experimenting with may different GUI (and non-GUI) tools, I really like LuckyBackup Lucky does all of the requirements you've requested and is very very straight forward.

3) I backup to the cloud using Crash Plan. This is a commercial service with a good Linux client app. It's inexpensive, and in my case, I just have it work right on my NAS, but you can just put the client on your local...

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Wallet Software & Backups

REMINDER: All Grantcoin users were REQUIRED TO UPDATE to version 0.7.0 by DECEMBER 3, 2015. After that date, the old version of Grantcoin wallets may not work. Users who try to send transactions with the old version may lose their coins! Click here for more information.

Desktop Wallets

The Grantcoin Foundation provides free downloads of Grantcoin desktop clients. Download the version you need, unzip, and install on your computer:

Smartphone Wallets

Web-Based Wallets

Twitter: Send and receive Grantcoin on Twitter using our web-based Twitter wallet app. Anyone with a Twitter account can use it; no download or setup required. This is the easiest way for the average person to get started using Grantcoin. Click here for instructions.

Ripple: Grantcoin could be stored in a web-based wallet on Ripple Trade, a service which was shut down by Ripple Labs in early 2016. The...

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Create the Backup

This is the simplest use case. It copies all your MySQL data into the specified directory. Here is how to make a backup of all the databases in the datadir specified in your my.cnf. It will put the backup in a time stamped subdirectory of /data/backups/, in this case, /data/backups/2010-03-13_02-42-44,

$ innobackupex /data/backups

There is a lot of output, but you need to make sure you see this at the end of the backup. If you don’t see this output, then your backup failed:

100313 02:43:07 innobackupex: completed OK!

Prepare the Backup

To prepare the backup use the --apply-log option and specify the timestamped subdirectory of the backup. To speed up the apply-log process, we using the --use-memory option is recommended:

$ innobackupex --use-memory=4G --apply-log /data/backups/2010-03-13_02-42-44/

You should check for a confirmation message:

100313 02:51:02 innobackupex: completed OK!

Now the files in...

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Many Americans will be using use paperless voting machines when they vote in the U.S. elections.

About one-fourth of registered voters are expected to use electronic machines that do not produce a paper backup, according to the Reuters news service.

Some of the touch-screen equipment is over 15 years old.

Security experts say the paperless machines can have issues that result in votes being wrongly recorded. The lack of a paper record makes it impossible to make sure the systems are working correctly, they said.

The Reuters story was based on information from three groups: U.S. Census Bureau, the U.S. Election Assistance Commission and the Verified Voting Foundation watchdog group.

Americans will choose a new president, a new Congress and vote on local issues in the November 8 election.

FILE - A voter casts his ballot behind a ballot...

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I'm just getting started with bitcoin and haven't acquired any significant amount yet, but want to feel relatively secure before I do. And at the moment, my fear of losing bitcoins or a device on which I store bitcoins is slightly greater than my fear of having them stolen so I'm investigating how to make a paper backup. I have looked around and what I have seen seems more complicated than necessary. I am wondering if I could simply:

Start up my bitcoin 0.7.1-beta client Transfer all my bitcoins to some address in the client Open the debug window console Enter walletpassphrase 60 Enter dumpprivkey Print the private key that is displayed

Then if I ever need to recover it, I could import that private key into any other bitcoin client. If it's the same bitcoin client newly installed, I could enter importprivkey .

My one concern about this is that I have somewhere read that some bitcoin wallets "un-steal themselves" and I am worried and wondering if that means that...

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As Nick mentioned, I'm not a fan of encrypted paper backups. Instead, I added "Fragmented Backups" to the new version (0.90-beta, posted a few days ago on the website), to give the user flexibility in balancing physical security & redundancy without the high risk of permanent coin loss. After all, 95% of the emails we get are users who forgot their password. Many of them didn't even realize that their paper backup protected them against that. As far as I'm concerned, that's the number one reason to make it.

Of course, doing it this way does reduce physical security, but that's far from the biggest threat to most users. If you are concerned about physical security, I recommend you explore the fragmented backup system in the new releases, which addresses these concerns in a robust and "responsible"...

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* This guide use dumpprivkey and importprivkey
* Purpose of this guide is less hassle in wallet backup.
* Tested in testnet
* user ms06 and user ms05
* As address(private key) for NM is in both wallet, spend in main wallet could spend some portion of NM's 1K.
----> This will not break backup, but masternode could be invalided.
* If you spend using NM's wallet, backup is breaked, you should backup NM wallet also.
Keypool is diffrent in both wallet, so do not spend using NM's wallet.
Use backuped wallet, then backup backuped wallet.



Spend your Darkcoins by importing your private key to the client wallet. Keep in mind when you import your single key to a Darkcoin p2p client and spend funds your key will be bundled with other private keys in the p2p client wallet. When you perform a transaction your change will be sent to another Darkcoin address within the p2p client wallet. You must then...
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Another power glitch. I had a similar situation in my recent thread:

I did each of the steps recommended there:

I rebooted with a forced fsck; ran dash-qt with -reindex; removed mncahe.dat and peers.dat...
Finally, renamed wallet.dat and got it to open with a new wallet, then tried to open with a backup wallet, which fails.

I didn't document every step I did or the results, but at this point this is the error it's throwing when trying to open with the backup wallet:


A fatal error occurred. Dash can no longer continue safely and will quit. EXCEPTION: St13runtime_error CWalletDB::ListAccountCreditDebit() : cannot create DB cursor dash in Runaway exception

With the virgin new wallet it opens normally and syncs up.

So, I did save a number of backup copies of this wallet, though not in several weeks, since I only ever created one address, and have...

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PaperBack Olly, the author of OllyDbg, presents his new open source joke:


Updated by Michael Mohr

Download PaperBack v1.10
Download sources v1.10

PaperBack version 1.00 does not implement AES encryption properly. Specifically:

a) The key used for (en|de)cryption in version 1.00 provides at most an effective key strength of less than 50 bits (and likely far less, perhaps on the order of 15-25 bits, depending on password quality) instead of the expected 256 bits. Version 1.10 derives the encryption key from the password via key stretching, significantly improving key strength. This change causes a small delay in the encryption step.

b) PaperBack version 1.0 implements ECB mode symmetric encryption. This mode is subject to a watermark attack and leaks information about the encrypted data. Version 1.00 changes the encryption mode to CBC, which mitigates this attack.

2) AES key length is now selectable in paperbak.h via...

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Hey @Matt Rainey good to see you found your way to the forums!

I would suggest trying the following method(s).

Saving the (old) 1.4 wallet.

Method 1:

* Start the Vericoin 1.4 wallet.
* Click the File menu.
* Click Backup Wallet.
* Save the wallet on your desktop/usb/flash/hdd or your prefered medium.

Method 2:

* Go to the %AppData% folder on Windows (Windows key + R and type %AppData%).
* Search for the Vericoin folder.
* Backup the wallet.dat file in this folder.

Safe it on multiple (storage) devices just to be sure. Better safe than sorry.

If you saved the wallet.dat you can remove/uninstall the Vericoin 1.4 wallet.

Now we need to import the wallet.dat you just saved.

* Install the Vericoin 1.6.4 wallet.
* Start the 1.6.4 wallet.
* Exit the wallet when it starts syncing.
* Go to the %AppData% folder on Windows (Windows key + R and type %AppData%).

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Windows: If you spent a lot of time tweaking your Start Menu to your liking, you’ll want to make sure you don’t lose it. Fortunately, you can backup your layout by making a copy of a hidden folder.

Your Start Menu layout is saved within the hidden AppData folder on your system drive in Windows. To find it, you’ll need to make sure you can view hidden folders. To find the folder and make a copy, follow these steps:

Open a new Explorer window. Navigate to C:\Users\[YOUR USERNAME]\AppData\Local\TileDataLayer If you cannot see the AppData folder in your user folder in the previous step, click the View tab and check the box that reads “Hidden items.” Then, repeat Step 2. Copy the folder that reads “Database” to another location. For example, keep the copy in your Dropbox or on another hard drive. If you need to restore your Start Menu layout, copy your backup back to the location in Step 2.

This folder contains all the information needed to put your Start Menu back...

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