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

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960 views

What are the bitcoin dependencies for red hat linux? Bitcoin fails to compile

I'm using CentOS on my server, and when I try to compile bitcoin from the github source using make -f makefile.unix, I get a ton of errors. I'm assuming they're caused by dependency errors? I've seen ...
0
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2answers
29 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 ...
-2
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1answer
45 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 ...
0
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1answer
61 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 ...
1
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1answer
281 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 ...
17
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3answers
16k views

Where is the data folder for Bitcoin-Qt?

Where can I find the blockchain, wallet.dat, etc. on each of the operating systems Bitcoin-Qt supports?
4
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2answers
1k views

ECDSA r, s encoding as a signature

An ECDSA algorithm when signing a given messages produces a pair of outputs, r and s. How, given a sigStr from a Tx can one extract r and s? Are they just concatenated byte arrays of a specific ...
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2answers
38 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 ...
2
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1answer
21 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
15 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 ...
0
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2answers
737 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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0answers
25 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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0answers
24 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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0answers
28 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 ...
0
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1answer
33 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 ...
1
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1answer
50 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 ...
1
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1answer
154 views

my wallet will not send BTC

I get this error when I try to send BTC A FATAL ERROR OCCURRED. Bitcoin can no longer continue safely and will quit. Exception: St13runtime_error CDB(): can’t open database file wallet.dat, error ...
1
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1answer
76 views

I sent bitcoin from my BitcoinQt wallet while it was unsynced to another wallet, do I have to wait for it to sync?

The wallet shows that the transaction has not been broadcasted yet with 0 of 6 confirmations. My wallet is stuck on a block right now.
5
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1answer
96 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 ...
3
votes
1answer
221 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 ...
3
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1answer
140 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.
7
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1answer
766 views

Does the main Bitcoin client blacklist addresses?

Does the main Bitcoin client blacklist any addresses that send too many erroneous messages? If so, how can one whitelist a particular address? I am developing an app that will be communicating with ...
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2answers
49 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 ...
0
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1answer
14 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
40 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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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.
0
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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 ...
5
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2answers
3k views

How do I use Multisig transactions to handle escrow needs?

I want to do a private escrow between me and someone else for a Bitcoin miner, and it will take weeks or months for that miner to arrive. I think multisig is an easy trust-free way to accommodate ...
3
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5answers
12k views

My client stopped synchronizing, how can I access my wallet?

My wallet has been stuck synchronizing for 21 days, my transfer is in the block chain but I can't get it to sync with my wallet. I've closed firewalls, uninstalled and reinstalled QT with back up and ...
0
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0answers
38 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
414 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
63 views

descriptions of the bitcoin-qt files

bitcoin-qt creates files under ~/.bitcoin/ in my file system. i know that the ~/.bitcoin/blocks/blk*dat files contain the blockchain, but what do the following other files contain: ...
0
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1answer
130 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 ...
5
votes
1answer
77 views

What BIPs are supported by the standard client Bitcoin Core?

There is different BIP, each has a status. I read somewhere that BIPs are not considered part of the Bitcoin protocol until "active". Nevertheless, Bitcoin Core seems to support a number of BIPs that ...
0
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1answer
27 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 ...
1
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2answers
922 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 ...
2
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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.
2
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3answers
100 views

In what respect is Bitcoin “programmable cash”?

In my local Bitcoin meetup, someone said Bitcoin is "programmable cash". Can someone please explain if and to what respect this is true? I read about a few BIP (Bitcoin improvement proposals) that ...
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2answers
64 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
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 ...
5
votes
1answer
136 views

What is the schema of the data stores used by the reference client?

I'm interested in seeing the schema (layout and indexes) that is used in the reference client. Namely wallet.dat, the bk** files and also the in-memory uncommitted tx. Does this exist anywhere for ...
6
votes
1answer
486 views

What is “Key Splitting”? When would I use it?

Here is some github code to create split keys. Is Key Splitting the same as Multi Sig? What are the benefits of Key Splitting, what's it used for? How does it relate to P2SH or any other relevant ...
2
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0answers
70 views

What restrictions will be placed on X509 certificates that are used in the payment protocol?

I'm looking at BIP0070 and also this forum thread which is locked for some reason; so I'll post here. When it comes to validating a certificate for the purpose of a Bitcoin payment, each certificate ...
5
votes
2answers
2k views

Why does the initial blockchain download get stuck part way through?

I am trying to get Bitcoin up and running on a fairly underpowered laptop and Windows Vista using bitcoin-qt 0.5.0.1 . After installing and starting the program I am stuck at at the syncing stage at ...
4
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3answers
3k 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?
0
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1answer
120 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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0answers
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
72 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 ...
1
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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 ...