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

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Error: Wallet backup failed! (code -4) when setting up bitcoin-qt for first time

I downloaded and ran bitcoin-qt to play around with. First thing I did was create a wallet passphrase. The second thing I did was try to create a wallet backup. Then I got this message: Error: ...
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13 views

Logos cannot make connections or download blockchain [duplicate]

I have downloaded Logos' source code mentioned below links, I have also able to create the Genesis Block of that. The GUI application shows zero "active connections" on bottom right corner icons. It ...
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23 views

Bitcoin Core shows error message

I have used Bitcoin Core for over 02 months it ran so smooth, but today i open Bitcoin Core and it show error message like this image: Bitcoin Core (OSS GUI client for Bitcoin) has encountered a ...
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21 views

Fatal error: Uncaught exception 'Exception' with message 'Invalid Response'

Fatal error: Uncaught exception 'Exception' with message 'Invalid Response' in C:\xampp\htdocs\jsonRPCClient.php:155 Stack trace: 0 C:\xampp\htdocs\jsonRPCClient.php(87): ...
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27 views

Bitcoin-QT blockchain: your speed experience with using any HDD connected via USB2.0 with TrueCrypt?

Background (I've never used bitcoin before.) I have Bitcoin-QT 0.9.3 (zip version). bitcoin-qt.exe sits on the internal HDD of my laptop. All of the other stuff (blockchain, wallet,...) on a 128GB ...
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1answer
46 views

Is there a way to reindex from disk but not start from blk0000.dat?

While my Bitcoin-Qt was synchronizing, I ran into the following error: It first loaded full blocks from blk00000.dat to blk00217.dat file (with file size about 131 MB per file). Then Bitcoin-Qt ...
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1answer
32 views

How to send user input data(Bitcoin address) from iPhone to server and then send Bitcoin back to user's Bitcoin address?

Background I just got started yesterday learning Python and I'm currently building my first iPhone game. What I'm trying to do is create a Bitcoin Pot Jar inside an iPhone app like ...
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1answer
94 views

How many addresses does my wallet.dat contain? Do I need to make a new backup every time I make a transaction?

I'm having little problem here, trying to figure out the safest way to backup my wallet.dat to make sure that no BTC may be lost in case of recovery. I'm not sure how the process of adding new ...
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1answer
139 views

What are test_bitcoin.exe and test_bitcoin-qt.exe?

These two binaries appeared in Bitcoin Core a few versions ago, but I don't remember ever seeing an explanation of what they are and what you would use them for.
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44 views

walletNotify on every Bitcoin Network transaction

Is there any way by which I can receive each and every Bitcoin transaction that takes place on the Bitcoin network(not only my own wallet's transactions)? Just the way Blockchain.info provides a ...
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2answers
35 views

How to use bitcoin-python

I'm trying to create a bitcoin address with the bitcoin-python library. I tried this code: import bitcoinrpc bitcoinrpc.connect_to_local().getnewaddress() But I got this error: error: [Errno ...
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1answer
13 views

How often should I back up my wallet if I use Bitcoin-Qt client? [duplicate]

I am new to bitcoin and the first client I installed was Bitcoin-Qt (Bitcoin Core v0.9.3.0-gcea5e49-beta). After installing and downloading the blockchain I immediately created a backup file. The ...
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3answers
38 views

Can I generate payment adresses while offline?

So I'm using the original bitcoin client. What if on a computer without internet (A) I generate a bitcoin address and then use this address to receive a payment (by using an other computer with ...
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37 views

Error trying to compile own coin in windows

I'm trying to compile my own coin in windows. I keep getting this error when running qmake "USE_UPNP=- (MyCoinHere)-qt.pro Project MESSAGE: Building without UPNP support The directory name is ...
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1answer
26 views

Is there a BIPs roadmap somewhere?

Which BIPs are already implemented by bitcoin-core and which are scheduled to be supported by the client in the scheduled releases? I found these questions to be relevant: Where can I find out ...
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2answers
116 views

any way to recover lost qt bitcoin wallet? [duplicate]

Hi is there any way to recover my Bitcoin-Qt wallet with only an address and the wallet password? Unfortunately my disk was formatted.
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2answers
27 views

osx - bitcoin-qt v0.8.6 doesn't starts at osx 10.9 non-developer machine

I've compiled a bitcoin-qt v0.8.6 on osx 10.9. It successfully runs on developer machine from 'Finder' (as Bitcoin-Qt.app) and from terminal (as ./Bitcoin-Qt.app/Contents/MacOS/Bitcoin-Qt). I've ...
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2answers
63 views

How to run multiple bitcoin RPC commands through the command window?

Yes, I can generate a new address through the bitcoin-qt command console, but how might I run a for loop to generate 100 different addresses? What kind of file does the bitcoin client take? Can I run ...
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1answer
25 views

Is it possible to get bitcoin-cli without having to build all bitcoin source?

I'd like to use the bitcoin client to examine some of the inner workings of bitcoin-qt (non-invasively, using gets and lists mostly). Is it possible to do this alongside the standard executable? I ...
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1answer
46 views

2 bitcoinqt - getrawmempool returns different results

I have 2 servers with running the same Bitcoin Core v0.9.3.0-g40d2041-beta (64-bit). I use getrawmempool to get all new transactions in the same time but I have different result. One server always ...
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1answer
117 views

How much space does armory and the latest version of Bitcoin-Qt take up, together?

It seems like Armory and Bitcoin Core are taking up 78GB so far, and it's not even done downloading. How much more space will I need? Is it possible to get rid of some of the data after it is all ...
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25 views

How do I make a new address in Bitcoin-Qt?

I have downloaded Bitcoin-Qt from bitcoin.org, but the version is experimental. I want a full version of Bitcoin. Also, I cant make a new address using the "Receive" tab; there is no detail in the ...
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1answer
22 views

getrawtransaction - find destination and “change” addresses

How to get destination address and amount from result of getrawtransaction and how to distinguish it from "change" address using rpc api.
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1answer
33 views

How in laymans terms do I restore a .dat BTC backed up wallet file on my mac please? [duplicate]

the bitcoin wallet backup.dat file is in my documents but I'm not an advanced computer user I have the complete bitcoin qt on my computer but don't know how to restore from the backup
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2answers
91 views

How do I spend my Bitcoins without waiting for Bitcoin-Qt to sync?

I purchased $50 from ExpressCoins and now it's transferred to the address, but I hadn't realized that to use your program, I have to download 20 gigs of information. Is there a way to access my coins ...
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4answers
118 views

Monitor non-wallet bitcoin addresses for new transactions

This is usual checkout functionality. Show address to the user and needs to monitor it for new transaction during n minutes. Addresses are not unique for each payment. Optional:it would be good to ...
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2answers
68 views

Unable to open Backup binary file Linux

I recently reinstalled Linux mint; I backed up my wallet, and I am unable to import the backup created from the original wallet (Qt version 4.8.6.) to the newly installed wallet(Qt version 4.8.6.) I ...
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1answer
82 views

Is there a way to use My Wallet account with bitcoin-qt client?

I have some funds on My Wallet account (Blockchain.info) and I'd like to have a possibility to use them with my bitcoin-qt client. Is there a possibility to do that? Please give short description. I ...
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2answers
171 views

Do i need ~4 years to sync?

I just downloaded bootstrap (~21GB) and started bitcoin base. It shows me that time to sync will be 4 year and 17 weeks? Is it going to change, or do i have to wait that much? My internet downloading ...
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30 views

Bitcoin QT Can't Sync to server [duplicate]

I just started to try out bitcoin, and I heard you needed Bitcoin QT. I downloaded it and opened it up, and it says "Synchronizing with network" at the bottom. I have had it open for more then 20 ...
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1answer
406 views

How do I use mSIGNA without the standard Bitcoin client?

Which IP do I have to fill in in mSIGNA to connect to the Bitcoin Network without using the BitcoinQt/bitcoind application? Is it possible to use mSIGNA and BitcoinQt even if the syncing process is ...
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1answer
43 views

Does bitcoin-qt support mining in a pool?

I am having difficulty getting guiminer to share a pool with me but if I mine on bitcoin-qt -gen 1 it starts hashing straight away. So I'd like to know if the official bitcoin client supports pooling? ...
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58 views

GUIMiner not moving from 'Connecting…'

I've setup bitcoin core, guiminer on my windows 7 intel i7 laptop just to see how things work. As there's no dedicated graphics card I just installed the OpenCL driver for the CPU, joined slush's pool ...
2
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1answer
101 views

Transaction was rejected - Bitcoin QT, recovered wallet.dat

I recently installed a new version of Windows on a new HDD, but I'm having problems getting my old wallet.dat to work. Here's what I've done: Install latest Bitcoin Core. Copied over the blocks and ...
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0answers
50 views

Bitcoin Escrow API [closed]

I have an e-commerce website. In my website there are two types of registered users: Seller (They place an advertisement to sell there product [example:house]) Buyer (Want to buy house of seller ...
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26 views

If I want to run the Bitcoin client from another OS, can I direct Bitcoin to an already downloaded Blockchain on another OS' partition?

I have fast internet, and it wouldn't be too much of a struggle just torrenting the bootstrap.dat, but it would make sense to make use of an already existing blockchain and save space and time. I've ...
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64 views

Bitcoin Core and Armory working together? [duplicate]

I am confused, totally new to Bitcoin and not really a digital expert, so forgive me if the following is stupid. I downloaded Armory two weeks ago and it asked me to also install Bitcoin QT which I ...
2
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1answer
58 views

Is it possible to specify a default change address?

Is it possible to enable default change address on my bitcoin-qt (aka bitcoin-core) client? I'm using a webservice that monitors my balance (based on public keys) and whenever I send a transaction my ...
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1answer
33 views

How does serializing in coins.h work?

I'm talking specifically about this: /** pruned version of CTransaction: only retains metadata and unspent transaction outputs * * Serialized format: * - VARINT(nVersion) * - VARINT(nCode) * - ...
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1answer
65 views

How to get the number of the confirmed transactions from Bitcoin QT Rpc

We are building a generic wrapper around Bitcoin-Qt. I wonder if there is way to get the information about the confirmation count of a transaction from a Bitcoin-QT having an empty wallet using the ...
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1answer
56 views

How do I run Armory Testnet on Win7 x64 using Bitcoin Core 0.9.3 using remote datadir?

Trying to use the testnet which I have no problems with using Bitcoin Core 0.9.3 with command: Bitcoin-qt.exe -testnet -datadir=f:\data\bitcoincore But running Armory using the Testnet icon attempts ...
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1answer
41 views

Bitcoin-qt and lost local blockchain files

For some reason I've lost all data in my .bitcoin directory except the wallet.dat file. Now bitcoin-qt shows 0 balance, and it's 5 years behind sync. Is this possible to restore coins in this case?
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2answers
480 views

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 ...
2
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0answers
120 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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41 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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1answer
144 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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2answers
69 views

Is Bitcoin a developer only currency and community?

The Bitcoin repo on Github has 7 members. Ultimately, they decide what bug fixes and pull requests get merged. I don't understand how this is decentralized? Yes, it is open source, so anything they do ...
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65 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
27 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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2answers
40 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: ...