Bitcoin-Qt is an MIT-licenced Qt 4 GUI application for the original Bitcoin codebase.

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How can I transfer the last little bit from my Bitcoin Core wallet to Armory?

I'm moving my bitcoins to Armory because its deterministic wallets are SO much better for keeping good backups. But bitcoin core didn't make it easy for me to sent all my money - if I specified all of ...
6
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3answers
1k views

Is there a way to not pay the transaction fees when using the standard Bitcoin client?

I tried sending one satoshi (0.00000001 BTC) to one of my friend and the client always showed a dialog prompting me to pay 0.0005 BTC in fee, with the only options being OK (pay the fee) or cancel ...
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0answers
20 views

bfgminer on bitcoin-qt

I am getting this error and looking for guidance. Error : Most likely you have input the wrong URL, forgotten to add a port, or have not set up workers config server=1 rpcallowip=192.168.1.0/24 ...
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3answers
1k views

0 connections now, but I had been using Bitcoin QT for a while without problems

I had been using my Bitcoin client for months on my Windows computer running XP. One day, I have trouble connecting to anything else on the internet, but my Bitcoin client seems to be running okay. ...
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2answers
93 views

Unable to establish connection to bitcoin using json and php

I'm newbie to bitcoins. Im trying to get the info, as much as I can. I'm trying to get the information by using getinfo() method that is mention in api documentation. The code i have tried is ...
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1answer
570 views

How secure are the DNS servers for Bitcoin?

With the version 0.6, Bitcoin introduced the DNS servers that populate the initial peers for new clients. How secure are those servers in terms of being immune to takedown attacks, or injection of ...
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2answers
171 views

Where to place Bitcoin bootstrap.dat

I'm sure this has been asked many times before, but I've recently gotten into the whole cryptocurrency thing starting with Dogecoin, and I now want to use Bitcoin as well. I am on Windows 7. I found ...
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1answer
19 views

Assertion Failed Error

Steps Install brand new Windows Server 2012 machine. I installed Bitcoin Qt I loaded my wallet.dat It ran ok for 8 hours. Than it gave an error : "Assertion Failed!" error. ...
2
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1answer
1k views

Data directory issue

I have everything set up normally. My only issue is that my data directory is in C:\Users\User Name\AppData\Roaming\Bitcoin. Normaly this is what you would want, but, if you noticed, my username has ...
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3answers
172 views

Address creation in standard client - random library?

Is the random library used by the standard client in any way deterministic, or can one count on it being truly random? For example, often random libraries are initialized with seed value of the ...
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1answer
77 views

Possible to use BlockChain.info and Bitcoin-QT synced?

I've used both BlockChain.info and Bitcoin-QT. Is it possible to use the same addresses on both? I don't have a incredibly large amount of bitcoins, so I'm not worried about it getting hacked into, ...
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32 views

bitcoin-qt stops subsequent RPC calls, then won't shut down

I am running latest bitcoin client, 0.9.2.1 - running on 64bit ubuntu.. I can start up the bitcoin client, via bitcoin-qt -server or bitcoind -daemon (both have the same behaviors).... ... once the ...
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2answers
1k views

How to move the blockchain data while still being able to use the wallet?

Using the standard client, Bitcoin-Qt, v0.8.1: I would like to move the blockchain data from its default location to a different location (maybe even an external disk or NAS drive). What should I do ...
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3answers
2k views

Stuck downloading block chain

I haven't started/used my Bitcoin client for ages but now whenever I start the client it is downloading block 135407 and it does not progress past it. What can I do?
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2answers
211 views

Cannot get Bitcoin-QT to run in testnet mode

I downloaded Bitcoin-QT for Windows 7 into: MYUSERNAME/Downloads/bitcoin-0.8.6-win32/bitcoin-0.8.6-win32 I want to run Bitcoin in testnet mode, so I created bitcoin.conf with only the following ...
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1answer
37 views

When do P2Pool Node Fees get paid?

I have set up a node and been running for a few days now and a couple of payments have gone out form it which is good. These payments are going to a coinbase wallet and there is a local wallet ...
2
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0answers
56 views

Bitcoin payout based on real-life event

Just starting to learn bitcoin scripting. Can someone explain how to pay out based on some real-life event? I currently test from the command line with bitcoind -regtest
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1answer
229 views

bitcond and bitcoin-Qt system configuration and bandwidth requirements

What is the best operating system configuration for a computer to run (bitcoind or bitcoin-Qt) and (BFGminer or CGMiner) under Linux, assuming that it will be connected to a 3 Terrahash mining rig on ...
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2answers
3k views

How to make Bitcoin-Qt client portable? (Windows)

It is a nice project and all, but I think in 2013 it shouldn't be a challenge to save all of an application's files into its own folder (maybe even by default), so you can use it without ...
11
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3answers
9k views

Bitcoin-Qt setup: Change block-chain file location, settings? documentation?

I am installing Bitcoin-Qt and have been reading about Bitcoin basics, but I found very little information on the client. I have a few questions about the Bitcoin-Qt program (v0.8.1-beta under Windows ...
0
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1answer
79 views

Qt client not exiting on Linux

I am running Ubuntu 12.04. When I close bitcoin-qt (or any of its derivatives, like litecoin-qt or dogecoin-qt), sometimes it does not completely exit. I then have to run killall -9 bitcoin-qt, or ...
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2answers
852 views

How can I send bitcoins with Bitcoin-QT using the API?

I'm making a bitcoin-based online marketplace. I've been reading/studying the Bitcoin API commands, and some of the commands need "unlocked wallet". Does this mean a wallet without a passphrase? I ...
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0answers
33 views

Maximum number of transactions in wallet.dat for Bitcoin Core

I know that a large number of key pairs in wallet.dat is not a concern. But is having too many transactions in wallet.dat an issue? Can Bitcoin Core start crashing after it reaches a certain number ...
0
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1answer
38 views

getrawtransaction doesn't work for every transaction with -txindex=1?

i put txindex=1 in bitcoin config and reindex blockchain after that when i call getrawtransaction for some transactions didn't exist in my wallet and work well like: [Working] getrawtransaction ...
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2answers
1k views

“Assertion Failed!” when I try to open Bitcoin Wallet

When I try to load my Bitcoin Wallet I get an "Assertion Failed!" window: here is what the window says: Program: C:\Program Files\Bitcoin\bitcoin-qt.exe File: src/main.cpp Line: 1761 Expression: ...
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2answers
156 views

How to import old wallet to Multibit?

I had 2 Bitcoins on my old PC and got a virus so did a format. But I also did a backup of my bitcoin wallet. Now I want to sell these bitcoins but when I went to the site, the official client was ...
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3answers
1k views

Why can't my bitcoin-qt sync with network?

For the last 32 hours my bitcoin-qt has been unable to sync with the network even with my firewall and VPN switched off. Any ideas what else to check? Using Windows 7 SP1 x64 and have rebooted the ...
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2answers
66 views

How do I switch from MultiBit to Bitcoin-QT?

Okay, so I have seen the questions on how to go from Bitcoin Core to MultiBit, but I want to go the other way. Really, I downloaded and started using the wrong wallet. I wouldn't even mind MultiBit ...
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1answer
24 views

Test in a box duplicating addresses how come?

I copied the whole directory for bitcoin data and then ran two instances one for the first directory and the other for the copied one, and then I generated a new address from the old instance go to ...
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3answers
58 views

Error compiling altcoin-qt for Windows, getting a GCC internal compiler error

I think I managed to get all my dependencies and libraries right (fingers crossed), but now when trying to build blackcoin-qt, the QTSdk compiler gives me this error while building qtipcserver.o: In ...
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2answers
32 views

Importing keys to a brand new wallet

After I imported keys to the brand new wallet I tried to test that it is imported properly so I ran salvagewallet command to verify my new wallet but got these errors! 2014-08-21 12:17:28 WARNING: ...
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1answer
203 views

How to make bootstrap.dat work with bitcoin qt

I have downloaded the bootstrap.dat torrent to make bitcoin qt synchronize faster. I have searched the bitcoin directory by writing in the Run Application "explorer %APPDATA%\Bitcoin" I have dropped ...
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23 views

What is the limitation of the bitcoin core database in a windows machine?

I'm having problems with more than 10000 private keys , I wonder what is the limitation and what is the best practice of number of keys in bitcoin core wallet? is there a limit in database size ?
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4answers
1k views

Can I configure Bitcoin (Linux) with a custom wallet location?

The default setup on Linux/Ubuntu has Bitcoin storing the data in the ~/.bitcoin folder, which is usually not encrypted with TrueCrypt. Suppose I do now want to rely on the internal Bitcoin ...
4
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2answers
3k views

Can you mine bitcoins with an intermittent Internet connection?

I've got a very precise question and this is not a dupe of: Does Bitcoin rely on the internet? My question boils down to: when you mine bitcoins, how "often" does the computer/hardware doing the ...
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2answers
50 views

Bitcoin-qt import private key crash

Importing a private using the debug console causes a crash, I always have to kill from shell the bitcoin-qt app and restart it. Is there any way to prevent this? Is there a way to import the private ...
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1answer
137 views

What are the weakest cryptographic guarantees in Bitcoin?

I read in this Github pull that Bitcoin relies on weaker cryptographic guarantees than SHA256. What are the weaker cryptographic guarantees being referred to? Could it be that RipeMD is 160 bits? ...
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1answer
36 views

Full node of bitcoin

I would like to have Bitcoin Core running as a full node. I thought it is like plus 100 GB. But on the web site it says it is no more than 20 GB. When I run Bitcoin-Qt is it enough to run full node or ...
2
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0answers
23 views

Bitcoin Core RPC goes does down

I have issues running Bitcoin core. Steps Install brand new Windows Server 2012 machine. I installed Bitcoin core. It ran ok for 8 hours. RPC server of bitcoin core goes down. When I do CMD> ...
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0answers
23 views

How do I export a private key from my Bitcoin-QT wallet if the wallet isn't synced? [duplicate]

I started syncing a bitcoin-qt client, and had somebody send me funds to an address generated in the client. I then stupidly decided to speed up the syncing process and downloaded a torrent of ...
9
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2answers
3k views

How can I import a private key into the Bitcoin client? [duplicate]

I have a private key and I want to add it to the keys in the Bitcoin client. Is there an easy way to do this?
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3answers
142 views

Ubuntu command to download https://launchpad.net/~bitcoin/+archive/bitcoin/+packages

What command do I use to get the latest bitcoin package under Ubuntu desktop 12.04 LTS? Also, what needs to be done to uninstall previous versions?
11
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2answers
2k views

How does the Bitcoin client encrypt the wallet.dat file?

What is the algorithm used for encrypting the wallet.dat file?
4
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1answer
48 views

Three numbers after dash in transaction id

In Bitcoin Core the transaction id is appended with a dash and three numbers. They are usually 000. What do those numbers mean? For example: ...
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2answers
42 views

How is the previous transaction hash calculated?

Can anyone provide a clear example on how to calculate a previous transaction hash. Say i want to create a new transaction, i get that the hash is calculated by doubling sha256 a message m, but I'm ...
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1answer
2k views

How can I create a new wallet on Bitcoin Core?

How can I create a new wallet on Bitcoin Core (Bitcoin QT)? I forgot my old password, so I can't create transactions using the old wallet. I don't have money on my old wallet, I just need to create ...
3
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1answer
161 views

Is bitcoin-qt using bitcoind? or bitcoind is already built in the bitcoin-qt wallet?

When using bitcoin-qt wallet, all commands are executed externally with bitcoind? I am asking because I saw an altcoin wallet-QT (DMD) which comes as a single file without any daemon file, does it ...
2
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3answers
464 views

Bitcoin is using +90% CPU power using Ubuntu 12.04?

I am using Ubuntu 12.04 and Bitcoin client v0.8.6.0-g03a7d67-beta and Qt version 4.8.1 as the GUI. My CPU is heating up and is automaticly shutting down after 30 minutes and sometimes after many ...
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0answers
37 views

Gitian Build Issue - Windows

Got a little issue when compiling Windows QT using Gitian. BTW Im using a Ubuntu 12.04 64bit VPS. So I am using the instructions here : ...