Import Wallet Dat Bitcoin – loapromax1979 BLOG

I found a Bitcoin on a wallet on an old laptop I was going to throw out. I'ts taking forever to synchronise as it was last used about 2 years ago and it keeps overheating and switching itself off. Is there a way of speeding up the synch?

submitted by SnozzlesDurante to Bitcoin [link] [comments]

How should I keep my Bitcoin safe?

Hi, I need some technical help here. In a rare moment of lucidity I bought Bitcoin back in march 2013. I did what everyone recommended, I put a password on the wallet file and I made backups of my wallet file.
The problem is that naive me thought he would contribute to the network, by using Bitcoin QT. Today I have a file of 50 gigabyte on my computer and will have to download a few more gigabyte if I ever want to spend my bitcoin.
I'd rather not upload my wallet file to cause that whole process seems like a recipe for disaster. Is there some easy method to import my wallet file into a lightweight client that I can install on my computer, that doesn't start downloading the whole blockchain everytime I start it up?
submitted by dontbotherbanningme to Bitcoin [link] [comments]

Just found my old wallet.dat any help would really be appreciated

I've just found my folder called Bitcoin & Dogecoin from around 2014 on an SD card.

I do not know the password apparently (tried to import with BitPay), I have the following files in this folder

Any help getting into these would be greatly appreciated
submitted by Four-walls to Bitcoin [link] [comments]

Import for free clams? But...

... my wallets aren't in wallet.dat format, they got imported in to Multibit. Any suggestions?
submitted by db2 to CLAMClient [link] [comments]

Did I throw away 8 BTC?

I thought I knew how sending and receiving bitcoins worked, but I'm worried I did something horribly wrong. I attempted to transfer 8 BTC from my old wallet to my new one. My old wallet was created in 2011 with an old version of the bitcoin client (0.3.24) which requires me to store the entire block chain on my local drive. The new wallet was created with MultiBit 0.5.14 which does not require local storage. The block chain is enormous, and before I had finished downloading all of it I attempted to send 8 BTC from the old wallet to the new. This was ~36 hours ago. I still have not seen the 8 BTC appear in my wallet.
I am certain the address is correct. According to my old client, the transaction has been broadcast through 26 nodes but is unconfirmed. Is there a reason that I would need to download the entire block chain before the transaction could be completed? I'm worried that I did something wrong and I'm out $7,800. Any help would be appreciated, and I'll try to provide more information if necessary. Thank you.
submitted by King_Baggot to Bitcoin [link] [comments]

Can any one tell me how to i can transfer my multibit offline wallet to an online blockchain wallet...

submitted by amitahuja1995 to Bitcoin [link] [comments]

need to switch my bitcoin from knowledgible people would be appreciated.

I was running bitcoin qt in the was formatted. i do not want to run bitcoin qt anymore,cant spare the storage and bandwidth.
So,i need to switch to a lightweight(and yet secure) client. I dont care about old addresses or keys.I can make a new wallet.but i want the BTC that is in that wallet.dat file. The simplest way would be to make a transaction,but that would require me to download and sync blockchain,and that would take weeks for me.
So is there a way i can do that,without downloading the entire blockchain again? Thanx.
submitted by kurt_c0ba1n to Bitcoin [link] [comments]

Secure paper wallet tutorial

This is my handout for paranoid people who want a way to store bitcoin safely. It requires a little work, but this is the method I use because it should be resistant to risks associated with:
  1. Bad random number generators
  2. Malicious or flawed software
  3. Hacked computers
If you want a method that is less secure but easier, skip to the bottom of this post.
The Secure Method
  1. Download (Try going to the website and pressing "ctrl+s")
  2. Put the file on a computer with an operating system that has not interacted with the internet much or at all. The computer should not be hooked up to the internet when you do this. You could put the bitaddress file on a USB stick, and then turn off your computer, unplug the internet, and boot it up using a boot-from-CD copy of linux (Ubuntu or Mint for example). This prevents any mal-ware you may have accumulated from running and capturing your keystrokes. I use an old android smart phone that I have done a factory reset on. It has no sim-card and does not have the password to my home wifi. Also the phone wifi is turned off. If you are using a fresh operating system, and do not have a connection to the internet, then your private key will probably not escape the computer.
  3. Roll a die 62 times and write down the sequence of numbers. This gives you 2160 possible outcomes, which is the maximum that Bitcoin supports.
  4. Run from your offline computer. Input the sequence of numbers from the die rolls into the "Brain Wallet" tab. By providing your own source of randomness, you do not have to worry that the random number generator used by your computer is too weak. I'm looking at you, NSA ಠ_ಠ
  5. Brain Wallet tab creates a private key and address.
  6. Write down the address and private key by hand or print them on a dumb printer. (Dumb printer means not the one at your office with the hard drive. Maybe not the 4 in 1 printer that scans and faxes and makes waffles.) If you hand copy them you may want to hand copy more than one format. (WIF and HEX). If you are crazy and are storing your life savings in Bitcoin, and you hand copy the private key, do a double-check by typing the private key back into the tool on the "Wallet Details" tab and confirm that it recreates the same public address.
  7. Load your paper wallet by sending your bitcoin to the public address. You can do this as many times as you like.
  8. You can view the current balance of your paper wallet by typing the public address into the search box at
  9. If you are using an old cell phone or tablet do a factory reset when you are finished so that the memory of the private keys is destroyed. If you are using a computer with a boot-from-CD copy of linux, I think you can just power down the computer and the private keys will be gone. (Maybe someone can confirm for me that the private keys would not be able to be cached by bitaddress?)
  10. To spend your paper wallet, you will need to either create an offline transaction, or import the private key into a hot wallet. Creating an offline transaction is dangerous if you don't know what you are doing. Importing to a client side wallet like Bitcoin-Qt, Electrum, MultiBit or Armory is a good idea. You can also import to an online wallet such as or Coinbase.
The only thing you need to do is to honestly convert the brainwallet passphrase into the corresponding private key and address. You can verify that it is doing this honestly by running several test passphrases through the copy of bitaddress that you plan on using, and several other brainwallet generators. For example, you could use the online version of bitaddress, and brainwallet and safepaperwallet and bitcoinpaperwallet. If you are fancy with the linux command line, you can also try "echo -n my_die_rolls | sha256sum". The linux operating system should reply with the same private key that bitaddress makes. This protects you from a malicious paper wallet generator.
Trusting your copy of
Bitaddress publishes the sha1 hash of the website at this location:
The message is signed by the creator, pointbiz. I found his PGP fingerprint here:
"527B 5C82 B1F6 B2DB 72A0 ECBF 8749 7B91 6397 4F5A"
With this fingerprint, you can authenticate the signed message, which gives you the hash of the current file. Then you can hash your copy of the file and authenticate the file.
I do not have a way to authenticate the fingerprint itself, sorry. According to the website I linked to, git has cryptographic traceability that would enable a person to do some research and authenticate the fingerprint. If you want to go that far, knock yourself out. I think that the techniques described in this document do not really rely on bitaddress being un-corrupt. Anyway, how do we know pointbiz is a good guy? ;-)
There are a lot of skilled eyes watching and the signed sha1 hash. To gain the most benefit from all of those eyes, it's probably worthwhile to check your copy by hashing it and comparing to the published hash.
"But we aren't supposed to use brainwallets"
You are not supposed to use brainwallets that have predictable passphrases. People think they are pretty clever about how they pick their passphrases, but a lot of bitcoins have been stolen because people tend to come up with similar ideas. If you let dice generate the passphrase, then it is totally random, and you just need to make sure to roll enough times.
How to avoid spending your life rolling dice
When I first started doing this, I rolled a die 62 times for each private key. This is not necessary. You can simply roll the die 62 times and keep the sequence of 62 numbers as a "seed". The first paper address you create would use "my die rolls-1" as the passphrase, the second would be "my die rolls-2" and so on. This is safe because SHA256 prevents any computable relationship between the resulting private key family.
Of course this has a certain bad security scenario -- if anyone obtains the seed they can reconstruct all of your paper wallets. So this is not for everyone! On the other hand, it also means that if you happen to lose one of your paper wallets, you could reconstruct it so long as you still had the seed.
One way to reduce this risk is to add an easy to remember password like this: "my die rolls-password-1".
If you prefer, you can use a technique called diceware to convert your die rolls to words that still contain the same quantity of entropy, but which could be easier to work with. I don't use diceware because it's another piece of software that I have to trust, and I'm just copy/pasting my high entropy seed, so I don't care about how ugly it is.
Why not input the dice as a Base 6 private key on the Wallet Details tab?
Two reasons. First of all, this option requires that you roll the die 99 times, but you do not get meaningful additional protection by rolling more than 62 times. Why roll more times if you don't have to? Second, I use the "high entropy seed" method to generate multiple private keys from the same die rolls. Using the Base 6 option would require rolling 99 times for every private key.
I'm a big nerd with exotic dice. How many times to roll?
Put this formula in Excel to get the number of times to roll: "=160*LOG(2,f)" where f = number of faces on the die. For example, you would roll a d16 40 times. By the way, somewhat unbelievably casino dice are more fair than ordinary dice
The "Change address" problem:
You should understand change addresses because some people have accidentally lost money by not understanding it.
Imagine your paper wallet is a 10 dollar bill. You use it to buy a candy bar. To do this you give the cashier the entire 10 dollar bill. They keep 1 dollar and give you 9 dollars back as change.
With Bitcoin, you have to explicitly say that you want 9 dollars back, and you have to provide an address where it should go to. If you just hand over the 10 dollar bill, and don't say you want 9 dollars back, then the miner who processes the transaction gives 1 dollar to the store and keeps the remainder themselves.
Wallet software like Bitcoin-Qt handles this automatically for you. They automatically make "change addresses" and they automatically construct transactions that make the change go to the change address.
There are three ways I know of that the change problem can bite you:
  1. You generate a raw transaction by hand, and screw up. If you are generating a transaction "by hand" with a raw transaction editor, you need to be extra careful that your outputs add up to the same number as your inputs. Otherwise, the very lucky miner who puts your transaction in a block will keep the difference.
  2. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the paper wallet. The change is not in the paper wallet. It is in a change address that the wallet software generated. That means that if you lose your wallet.dat file you will lose all the change. The paper wallet is empty.
  3. You import a paper wallet into a wallet software and spend part of it, and then think that the change is in the change address that the wallet software generated. If the transaction did not need to consume all of the "outputs" used to fund the paper wallet, then there could be some unspent outputs still located at the address of the paper wallet. If you destroyed the paper wallet, and destroyed the copy of the private key imported to the wallet software, then you could not access this money. (E.g. if you restored the software wallet from its seed, thinking all of the money was moved to the wallet-generated change addresses.)
For more on this, see here
The hot paper wallet problem
Your bitcoin in your paper wallet are secure, so long as the piece of paper is secure, until you go to spend it. When you spend it, you put the private key onto a computer that is connected to the internet. At this point you must regard your paper wallet address as hot because the computer you used may have been compromised. It now provides much less protection against theft of your coins. If you need the level of protection that a cold paper wallet provides, you need to create a new one and send your coins to it.
Destroying your paper wallet address
Do not destroy the only copy of a private key without verifying that there is no money at that address. Your client may have sent change to your paper wallet address without you realizing it. Your client may have not consumed all of the unspent outputs available at the paper wallet address. You can go to and type the public address into the search window to see the current balance. I don't bother destroying my used/empty paper wallet addresses. I just file them away.
Encrypting your private key
BIP 0038 describes a standardized way to encrypt your paper wallet private key. A normal paper wallet is vulnerable because if anyone sees the private key they can take the coins. The BIP38 protocol is even resistant to brute force attacks because it uses a memory intensive encryption algorithm called scrypt. If you want to encrypt your wallets using BIP38, I recommend that you use bitcoinpaperwallet because they will let you type in your own private key and will encrypt it for you. As with bitaddress, for high security you should only use a local copy of this website on a computer that will never get connected to the internet.
Splitting your private key
Another option for protecting the private key is to convert it into multiple fragments that must be brought together. This method allows you to store pieces of your key with separate people in separate locations. It can be set up so that you can reconstitute the private key when you have any 2 out of the 3 fragments. This technique is called Shamir's Secret Sharing. I have not tried this technique, but you may find it valuable. You could try using this website which will help you split up a key. As before, you should do this on an offline computer. Keep in mind if you use this service that you are trusting it to work properly. It would be good to find other independently created tools that could be used to validate the operation of passguardian. Personally, I would be nervous destroying the only copy of a private key and relying entirely on the fragments generated by the website.
Looks like Bitaddress has an implementation of Shamir's Secret Sharing now under the "Split Wallet" tab. However it would appear that you cannot provide your own key for this, so you would have to trust bitaddress.
Durable Media
Pay attention to the media you use to record your paper wallet. Some kinds of ink fade, some kinds of paper disintegrate. Moisture and heat are your enemies.
In addition to keeping copies of my paper wallet addresses I did the following:
  1. Order a set of numeric metal stamps. ($10)
  2. Buy a square galvanized steel outlet cover from the hardware store ($1)
  3. Buy a sledgehammer from the hardware store
  4. Write the die rolls on the steel plate using a sharpie
  5. Use the hammer to stamp the metal. Do all the 1's, then all the 2's etc. Please use eye protection, as metal stamp may emit sparks or fly unexpectedly across the garage. :-)
  6. Use nail polish remover to erase the sharpie
If you trust electrum you might try running it on an offline computer, and having it generate a series of private keys from a seed. I don't have experience with this software, but it sounds like there are some slick possibilities there that could save you time if you are working with a lot of addresses.
Message to the downvoters
I would appreciate it if you would comment, so that I can learn from your opinion. Thanks!
The Easy Method
This method is probably suitable for small quantities of bitcoin. I would not trust it for life-altering sums of money.
  1. Download the website to your hard drive.
  2. Close your browser
  3. Disconnect from the internet
  4. Open the website from your hard drive.
  5. Print a paper wallet on your printer
  6. Close your browser
submitted by moral_agent to BitcoinWallet [link] [comments]

MultiDoge 0.1.1 released - Much bugfix. Wow.

Yep, we just pushed version 0.1.1 of MultiDoge with some much needed bugfixes, but also small new functions! If you open the program now, it should notify you about the new version :)
Download Right here: Source:
How to update Check here: TL;DR:
  1. Backup your wallet by exporting keys or copying the data directory.
  2. Install new version.
  3. Check if all is okay.
  4. Uninstall old version.
Can't I just overwrite the old one? No, it's a matter of security. In the unlikely case something breaks with the new version you can easily go back to the old version.
Something else? We have a subreddit now for suggestions and stuff: /multidoge
submitted by langer_hans to dogecoin [link] [comments]

Update: Retrieving coins

Alright here's where I'm at. I have the wallet.dat file, and I have a file labeled multibit.key (which I'm assuming has to do with bitcoin, not doge). I didn't have the Dogecoin-QT app on my computer anymore but I did have a backup of my computer so I restored the app and now have it open but it is not syncing. According to the ELI5 that doesn't matter though. It says in recent transactions I tried to send out all of my doge to my reddit account but since it wasn't synced I don't know if that went through (although balance says 0). I tried using the help-debug-console where you do dumpprivkey "address" and it says that "Private key for address 'address' is not known (code -4)". I forgot to unlock before trying to get the private key. I now have my private key, but when I try to import to MultiDoge it wants a file instead of pasting the private key in. Would anyone know where to go from here? I used dogechain to import private key and it now shows full balance. I think I did it? Yep, I did it. Keeping the post up for future searches, hopefully it helps someone else.
Side question: Since the old dogetipbot is gone I can no longer access history or balance, what happened to the doge I had in that account? Is there a way I can access it?
submitted by JamrJim to dogecoin [link] [comments]

Need help with accessing to old wallet.

I need help with accessing my old wallet that I used to manage with Multibit. All I have is bunch of files multibit files:
multibit.checkpoints multibit.key multibit.wallet
How can I import this wallet and recover my coins? It appears that the Bitcoin core requires wallet.dat file which I do not have and Multibit is not allowing me to import these files as wallet configurations have been changed.
Any help is greatly appreciated.
submitted by EvoX-11 to Bitcoin [link] [comments]

How to open wallet.dat file?

I've had bitcoins since about 2015, and I always had access to them no problem through multibit classic. Recently I reinstealled windows and went to access my bitcoin but I can't... No program seems to accept my wallet.dat file or it just shows up blank. I tried to upload it to the blockchain site ( but nothing happens. I can't seem to access my bitcoin and it's really starting to stress me out. Any suggestions on how? I also have a .zip.aes file saved that I can't seem to use or unencrypt either. Thanks.
submitted by FreyWill to BitcoinBeginners [link] [comments]

How do I access the funds in a file called "money.bit"

I've been bitcoining for a few years, and have an old file I've been meaning to try and access for a couple of years.
It begins:
I've replaced the bits I believe are sensitive.
I can't remember which program this file is designed to work with. I've tried loading one of the alphanumeric as a private key, but one of the attributes is salt, and I don't think it's quite as simple as just reading it as a text file and cutting and pasting one of the strings into the import private key feature on
It's a .bit file rather than a .dat or something else... unless I renamed it at some point to end .bit, to remind myself what it was, which is quite possible - it may have begun life with no file extension (I'm a Linux user).
I've already tried the contents with electrum, and I've used quite a few wallets in the past so I've been poking around bread, electrum, mycelium, and can't quite see how this wallet would fit with any of those. I've used (well, installed) armory, multibit, as well as used things like online wallet generators.
So I'm a bit stuck as to what to do, hoping someone recognizes this format!
submitted by regojr9 to Bitcoin [link] [comments]

Desktop Client Recommendation

can you recommend me any desktop clients ? So far I have tried bitcoin-core, Electrum and MultiBit. I liked Bitcoin Core, but as the blocks increase, it becomes extremely heavy. In my computer, it takes more than 10 minutes just to start, and while it is syncing I can't do anything else without freezing my computer, MultiBit uses the file from a server, so it syncs very fast, but the wallet seems to be incompatible with the wallet.dat and it doesn't seem to allow importing the private key, it only allows importing wallets generated by itself. Electrum is fast, doesn't freeze anything, it allows to import private keys, but it is taking way too long to sync, so i think it is downloading the blockchain...
So, I would like a wallet with these characteristics:
thank you all :)
submitted by yurifw to Bitcoin [link] [comments]

I want to store bitcoins for a long time, is this how I do it.

I download bitcoin qt. Have bitcoins it. Encrypt the wallet. Write down the pass on a paper. Copy the wallet.dat and paste it on a USB stick. 20 years later I import the wallet.dat file from the usb stick with Multibit, fill in the encryption pass and voila?
submitted by denart4 to BitcoinWallet [link] [comments]

How do I move private keys from Bitcoin-QT to another wallet without having the blockchain downloaded?

I currently access my bitcoins on Bitcoin-QT and have used a pretty good passphrase to encrypt the wallet.dat file. I would like to eventually move my coins to a paper wallet for offline storage, but currently want to get my coins over to (I set it up the account on a thumb-drive linux system with 2FA and a great password). I've read instances of people decrypting their wallet, then finding some unknown malware on their computer immediately emptying their wallets. I don't want to rely on the computer I currently have my wallet.dat file on just in case this happens to me. I'm trying to get my private keys into something like electrum or multibit using pywallet to decrypt my wallet.dat on a fresh linux system (thumb-drive again). However, the format from pywallet doesn't seem to be right to get it on electrum nor multibit.
Is there a special way to extract the private keys from wallet.dat to import them into multibit or electrum? I don't think using Bitcoin-QT on my thumb drive is an option since the blockchain is so huge and I think the blockchain is needed to do anything with Bitcoin-QT.
I didn't find too much help via google or the security guide on the right side of this page.
submitted by dyrich20 to BitcoinBeginners [link] [comments]

Question about Multibit Wallet & Java

I uninstalled Java on my computer because of the vulnerabilities stories that have been circulating around it, and because of an annoying pop-up to update it every time I ran my computer.
Anyways, now my Multibit wallet client wont open, and it asks me every time to update to Java [OK] or [Cancel]
Why does Multibit need Java to run? I'm waiting for the blockchain on my Bitcoin.qt wallet to update now so I can import my wallets.dat files. I used Multibit because I preferred their interface over the BTC.qt, but is it safe to use knowing it needs Java?
submitted by Chinxcore to Bitcoin [link] [comments]

finally implemented native wallet.dat import (wallet-key-tool)
Version 1.4 can now read wallet.dat files directly. The complete list of supported file formats is now:
import Multibit *.wallet Multibit *.key *.aes.json Bitcoin-core "dumpwallet" file Bitcoin-core wallet.dat (untested: Schildbach backup) export Multibit *.wallet Multibit *.key Bitcoin-core "dumpwallet" file (untested: Schildbach backup) 
submitted by prof7bit to Bitcoin [link] [comments]

How to use MultiBit? I have some questions about safety.

Ok. I transferred all of my bitcoins (0.7 BTC) to my MultiBit wallet. I set a password for my wallet. I have the .wallet file under AppData.
So this is the important file right? Where the btc are? I should only backup this file and ofcourse remember my password right?
Is the .key file important? Do I need it? Whats it for?
Is my wallet currently safe? Should I also encrypt?
Why don't I have a wallet.dat file? Is that only for Bitcoin-Qt wallets?
Thanks alot.
submitted by pardonnez to BitcoinBeginners [link] [comments]

Multi coin wallets : Instant internal Exchange Bitcoin for Alt Coins Simplified tutorial on how to decrypt a bitcoin wallet backup to use with multibitHD Hack bitcoin (private script) 2019 Recovery BTC Wallet How to recover your wallet using .dat file

How to restore litecoin wallet from dat file Apr 27, 2017 Coinbase wallets currently do not support a wallet import feature. If you have paper wallets, private keys, wallet.dat files, or brain wallets, they can be imported into another wallet (Bitcoin QT, Electrum, Multibit, Armory, Blockchain, etc) before being sent to your Coinbase wallet. 17/12/2017… Bitcoin Forum: February 25, 2018, 09:51:14 AM : Welcome, Guest. Please How to import wallet.dat into Multibit): was your How do I import private keys from Bitcoin-qt to Multibit client? up vote 22 down vote favorite. 13. Question says it. I spent 20 mins Googling. Saw several links on You can also use Bitcoin Core as a very secure Bitcoin ... Common operations Listing my bitcoin addresses. Listing the bitcoin addresses in your wallet is easily done via listreceivedbyaddress.It normally lists only addresses which already have received transactions, however you can list all the addresses by setting the first argument to 0, and the second one to true. Manual Steps. Copy your public receiving addresses from Bitcoin-Qt. Go to the Bitcoin-Qt console: click Help/Debug Window and then select the Console tab.; Run walletpassphrase [your password] [timeout in seconds] to unlock your password protected wallet.; Run dumpprivkey [Receiving Bitcoin Address] for each receiving address to be migrated to MultiBit. There may be hidden private change ... If I import the wallet.dat file from bitcoin-qt on laptop 1 into multibit on laptop 2, will my btc then show up in multibit on laptop 2? GUIDE: Exporting Encrypted bitcoin-qt wallet from bitcoin-qt into MultiBit Save your data file as filename.key and import it in MultiBit through Tools/Import I would like to make some tests with bitcoind – the bitcoin command line client. I already have a ...

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Multi coin wallets : Instant internal Exchange Bitcoin for Alt Coins Simplified

Wallets that offer internal [and almost instant] exchange of Bitcoin to Alt Coins : Coinpayments offers the biggest range of 50+ coins. Free to use with this... Bitcoin How to import your old wallet into new one tutorial works 100% Recovered 1.7 BTC - Duration: 8:26. XOOMdotWS 10,015 views bitcoin wallet private key import bitcoin core private key import bitcoin cash private key import bitcoin address is public key bitcoin wallet import key private key bitcoin id how bitcoin private ... Как безопасно получить Bitcoin Gold бесплатно из, Bitcoin core и т.д. - Duration: 8:41. HANDY TV 7,491 views 8:41 Here is a tutorial how to import your old bitcoin wallet into a new wallet in easy steps. I was able to import 1.7 old forgotten bitcoin from 2013.