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

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How I can verify a Transaction in my new alt coin?

I have created a new coin and all the coins are premined. But when I transfer some coin to other wallet, it shows as "Pending Balance" with 0/unconfirmed. I want to verify my transaction. How can I do ...
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38 views

What is “Signing transaction failed” error means ? How to resolve and avoid it?

I just tried to send some bitcoins and I received this error , I don't understand what does it mean and why?
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1answer
56 views

Ubuntu bitcoin PPA

Since bitcoin is a software package that involves "real" money (inasmuch as any currency is "real"), I know there are major incentives for unscrupulous people to build backdoors into software related ...
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1answer
40 views

How do I copy the blockchain to a separate computer running Bitcoin Core?

I'm running bitcoin-qt 0.8.6 on a different computer that has the whole blockchain downloaded. I tried putting all the blk.dat files and the index from that computer the blocks folder in bitcoin-qt ...
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1answer
42 views

Difference between createmultisig and addmultisigaddress?

What is the functional difference between createmultisig and addmultisigaddress in bitcoincore (v 0.10)? To be clear, I understand how both function. ie. multisigCmd n ["address1 public key as hex", ...
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33 views

Transactions aren't confirming in my new altcoin

I have created a new altcoin which already mined. When I send some coins to another wallet, it's deducted from my wallet, but the transaction never confirms. It says: 0/unconfirmed transaction So ...
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0answers
14 views

Why there is a no way to remove the encryption from bitcoin-qt UI [duplicate]

I encrypted my wallet with a passphrase in bitcoin-qt and I didn't find a way to remove this encryption from the UI , is there any way to do it? I wonder why there is no option for that ?
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1answer
34 views

Bootstrap.dat on Mac OSX 10.9 - Difficulty

Been trawling through a lot of information (I know this similar issue has probably come up a fair bit) on this issue and going round in circles a bit. I am not the most tech savvy individual, and ...
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1answer
71 views

Is multisig address belong to the same wallet created by?

I created 2-of-3 multisig address using bitcoinqt by three public keys from my wallet . when I tried to validate this address after creation it shows : "isvalid" : true "ismine" : false should it ...
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1answer
28 views

What does the keypoololdest field mean?

After reading this question I watched the keypoololdest. It was 1392447127 (Sat, 15 Feb 2014 06:52:07 GMT) I created a new address. Then, it was 1392449568 (Sat, 15 Feb 2014 07:32:48 GMT) Should ...
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1answer
29 views

Bitcoin-Qt wallet shows outgoing transaction as “Offline (0 confirmations)”

What is the meaning of a transaction status of "Offline (0 confirmations)" as opposed to "Unconfirmed (0 confirmations)" ? Does it mean that the transaction has not even been sent to the network yet? ...
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2answers
72 views

How to premine our coins in my altcoin?

I want to premine our coin, but I'm not able to understand which function from which file actually generate coin. So if you know than let me know so, I can understand that code and implement my own ...
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1answer
31 views

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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0answers
18 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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0answers
33 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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57 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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34 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
69 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
38 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
127 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
143 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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2answers
55 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
45 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
22 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
44 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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0answers
45 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
28 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
128 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
31 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
75 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 ...
0
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1answer
27 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
54 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
170 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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27 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
23 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
40 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
104 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
132 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 ...
2
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2answers
74 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
84 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
218 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
507 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
51 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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0answers
77 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
119 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
53 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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30 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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0answers
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
59 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 ...