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 ...
5
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1answer
59 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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0answers
40 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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2answers
884 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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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
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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0answers
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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4answers
995 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 ...
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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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3answers
796 views

Can I earn transaction fees by running as a full node, verifying transactions, but not mining?

As I understand it, by running a full node (i.e. Bitcoin-QT) , I am helping confirm transactions and contributing to the Bitcoin network. When transaction fees are offered, do I receive these, and ...
3
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1answer
73 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
345 views

How to set Bitcoin-Qt setgenerate mining recipient?

I know it's inefficient and a bad idea and all that, but I just discovered the setgenerate console command in Bitcoin-Qt (v0.8.1-beta, MAC) and I was wondering how to set the recipient address of "all ...
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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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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 ?
2
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1answer
158 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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1answer
29 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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1answer
509 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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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 ...
0
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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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1answer
68 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
289 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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3answers
17k 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?
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2answers
2k 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
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
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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0answers
58 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
35 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
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
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
161 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 ...
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1answer
78 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.
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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 ...
3
votes
1answer
236 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
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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1answer
777 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
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 ...
0
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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 ...
0
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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.
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 ...
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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
65 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: ...
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1answer
137 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
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1answer
81 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 ...
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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 ...