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

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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 ...
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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 ...
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1answer
75 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
840 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
27 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 ...
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1answer
35 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
143 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
65 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
23 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
52 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
31 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
144 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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0answers
21 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 ...
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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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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
45 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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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
77 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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2answers
85 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
16 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. ...
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1answer
135 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
35 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 ...
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21 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
16 views

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

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 ...
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1answer
72 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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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
140 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?
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1answer
30 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 ...
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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?
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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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39 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
1k 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
152 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
462 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
29 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 : ...
4
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3answers
2k views

Can I remove the passphrase from my Bitcoin Wallet?

I'm using the standard Mac Bitcoin client and I added a passphrase. I'd like to remove that passphrase. Is that possible?
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1answer
24 views

Bitcoin-qt transaction not initiated by the wallet owner

I was just mining for some Dogecoins with Eobot and parallel I had BGFminer set on solo mining + 4 pools from eclipse. The issue is that the moment the Eobot kicked in (it started on mining Dogecoins ...
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2answers
2k views

How to decode private key from Android Bitcoin Wallet?

I want to import my private key from the android's Bitcoin Wallet (the one created by Andreas Schildbach) but it can export it only in an encrypted way. How do I decrypt the file so I can import the ...
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2answers
237 views

Bitcoin-qt data on external drive

I have done the instructions listed here: How to move Bitcoin data from Application Support on external drive [mac] It works fine for a flash drive connected the mac, but I wanted to have the data ...
2
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2answers
230 views

Can Bitcoin-Qt be configured to trim the blockchain?

I run Bitcoin-Qt and Bitcoin Armory on a laptop. I don't have the space to store the whole 20 GB (or however big it is now) blockchain. I understand the need to run through the entire thing for ...
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4answers
19k views

How do I import private keys from Bitcoin-qt to Multibit client?

Question says it. I spent 20 mins Googling. Saw several links on bitcointalk.com but amazingly found no solution to this. Am I the first one trying to do this? Note the following are not the ...
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1answer
60 views

Cannot allocate memory

EXCEPTION: 11DbException Db::get: Cannot allocate memory bitcoin in ProcessMessage() Downloaded 250k blocks, now it won't run anymore i'm running ubuntu 12.04, I have 20GB HD and 1gb ram. any way to ...
2
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2answers
104 views

Which scripts are currently considered standard and therefore actually propagated?

All I've learned about script so far is that while theoretically quite versatile (e.g. allowing multisignature transactions) most scripts are simply not propagated by the default client nodes, i.e. ...
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2answers
605 views

How would we know the real Satoshi?

Should Satoshi decide to reveal his or her true identity, how can one know the person is the real creator of Bitcoin, rather than a person who hacked the forum login, email address or the like? In ...
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1answer
1k views

Manual for Bitcoin-Qt on Mac OS X

Is there a manual for Bitcoin-Qt on the Mac OS X? Specifically, I'd like to move my wallet.dat to a different folder (a TrueCrypt volume) and if/how I may configure bitcoin.conf so that the ...