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

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24 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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2answers
823 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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1answer
29 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
120 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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1answer
905 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 ...
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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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1answer
129 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 ...
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1answer
52 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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3answers
448 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
19 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 : ...
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2answers
40 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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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
56 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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1answer
22 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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0answers
19 views

Windows 8 Tile Change Background Color [closed]

Does anyone know how to change the tile colour in Windows 8 in the source code so that I can create and distribute clients while controlling background tile color? I found the following which ...
4
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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
196 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 ...
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2answers
215 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 ...
16
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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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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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1answer
18 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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2answers
72 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
57 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 ...
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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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1answer
67 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
600 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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0answers
17 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 ...
1
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1answer
61 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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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 ...
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1answer
81 views

Which wallet application lets you send to multiple output addresses with just 1 fee?

Which wallet applications lets you send to multiple addresses from one output? I'm looking to build a physical bitcoin kiosk faucet and was looking to see how I would avoid miner fees if i combined ...
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2answers
406 views

How to make a payment processor like bitpay which accepts bitcoin

I know it's a tough one,but it's urgent ,I know there exists some other payment procesors like BIPS,BitPagos,BTCMerch and few more like that.So I just need to know how to go about making a website ...
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3answers
130 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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0answers
19 views

10 weeks behind on bitcoin-qt and it just stopped working, keeps going back to saying “synchronizing with network”

I left bitcoin-qt running all night. When I woke up this morning, I was 10 weeks behind, but it went back to saying "synchronizing with network". I tried restarting bitcoin-qt and it said "importing ...
1
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1answer
40 views

Purpose of a BlockChain in local wallet application

I have installed the BitCoin wallet application on my PC, so that I can cold store my BitCoin. It's "Synchronizing with the network" and has 272 weeks of BC left to download (painfully slow!!) What I ...
2
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1answer
465 views

Bitcoin RPC SSL error

I recently tried running Bitcoin-QT as a server with SSL enabled, but when I was testing the connection, with this command: openssl s_client -connect 111.11.111.111:8332 I got this error: ...
4
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1answer
4k views

What's the difference between bitcoind and bitcoin-qt? Different commands?

This is a multi-part question, mainly do to contradictory information from different articles. It's got me all confused. From my understanding, bitcoin-qt is just a GUI version of bitcoind - which ...
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2answers
433 views

Old bitcoin wallet not working

So Im having a bit of a problem with my bitcoin wallet. See, I got into bitcoin about 2 years ago, back when bitcoins were worth very little real money, if any at all, but I managed to get quite a ...
2
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0answers
250 views

Bitcoin Client - How do I find the destination address of an incoming transaction?

I'm mining Bitcoins and have multiple incoming addresses in my bitcoin-qt wallet. When I get a payout for mining in the "Transactions" tab it shows the amount of BTC I received and the type is set ...
0
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1answer
295 views

Move bitcoin data from Windows to Mac

Is it possible to move the Blockchain data from Windows to Mac? The wallet on windows is synced, the one on mac is not. The wallet on Mac has had some bitcoins sent to one of its addresses. Would it ...
0
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1answer
278 views

I want to use another wallet.dat file with bitcoin-qt. Is this possible?

my situation is the following: I have a laptop with not much space on disk and therefore using bitcoin on a stick (I start bitcoin-qt with the argument "-datadir=location/to/stick). Now I wanted to ...
1
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1answer
208 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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0answers
22 views

How does Core distinguish between confirmed & unconfirmed Tx in memory?

Looking for a low-level answer, links to reference code would be helpful: Is there a difference between a Tx message received from a peer, and a Tx item as included in a valid block received from a ...
0
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1answer
56 views

How can I convert a bitcoin public key to a bitcoin address?

How can I convert a bitcoin public key to a bitcoin address? Note: I am using PHP. Is there an existing bitcoin API or PHP-API to do that converting ?
3
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2answers
75 views

Multisig doesn't work unless all keys were generated from the current wallet?

I tried to create a multisig in both the Bitcoin network and the Bitcoin testnet. It seems to work only when all public keys are from the current wallet. That means when I call listunspent after I ...
2
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1answer
8k views

Trying to access my BTC from Bitcoin-Qt wallet that is out of sync

I bought BTC and sent them straight to my Bitcoin-QT wallet. Now opened my wallet (ver. 4.8.3) and it says ~29000 blocks remaining to synchronize but this is not happening even though I have 14 active ...
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1answer
134 views

Why bitcoind/bitcoin-qt is imposing transaction fee?

bitcoind is imposing a transaction fee of 0.0001 BTC forcefully even though I have set "transaction fee" to 0. Is it possible to transfer BTC to an address without paying a fee? If so, how?
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2answers
60 views

How can i get balance of bitcoin address not exist in my wallet?

How can i get balance of bitcoin address not exist in my wallet ? I try to use bitcoin-Abe but it is complicated and take seral days to full database with blockchain. Is there exists other tools ...
1
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0answers
32 views

Build Altcoin-qt, keep getting 'This application has request the runtime to terminate it in an unusual way' error

I successfully built my coin on my laptop using Qt4.8.6, but get this error when I try to solo mine it. I can solo mine, but the error pops up. If I click 'ok', it shuts the program down and I can't ...