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

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3
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2answers
11k views

Faster way to sync my new Bitcoin wallet?

I'm very new to Bitcoin so I apologize if this question is naive. I just downloaded the Bitcoin, Litecoin, and Dogecoin Qt clients and opened each of these apps. Consistent with their coin's ...
0
votes
1answer
16 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 ...
1
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0answers
21 views

Bitcoin Core and Armory working together?

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 ...
9
votes
1answer
1k views

Why can’t the genesis block coinbase be spent?

According to the bitcoin wiki: The first 50BTC block reward went to address 1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa, though this reward can't be spent due to a quirk in the way that the genesis block ...
2
votes
0answers
21 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 ...
1
vote
1answer
23 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) * - ...
0
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3answers
197 views

Bitcoin.conf & JSON-RPC options

What does it mean in the bitcoin.conf file when it states, "server=1 tells Bitcoin-Qt to accept JSON-RPC commands?" If all one needs to do to solo mine is type setgenerate true in the console, then ...
1
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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. ...
4
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3answers
321 views

How to send bitcoin with a message attached

Is it possible to send bitcoins with an attached message with the transaction? If yes how to do it?
-1
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1answer
97 views

Could this stop double-spending?

Let's say you have a 15 second block time, and after your first transaction, your wallet's send button is frozen, and you have to wait for 2.5 minutes before you can send another transaction. Would ...
-1
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2answers
139 views

bitcoin-qt v0.7.2-beta qt version 4.8.2 is FROZEN/CORRUPT? [closed]

It keeps telling me at the bottom of the screen that the displayed transactions may not be correct! You may need to upgrade, or other nodes may need to upgrade. Can anyone help me please? i am using ...
1
vote
1answer
29 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 ...
2
votes
2answers
850 views

How to access Bitcoin's transaction database?

I want to process the Bitcoin network's transactions. As I understand it, the Bitcoin-Qt client downloads and stores all that information locally. Since version 0.8 LevelDB has been used to access ...
1
vote
1answer
184 views

Why does Github say that the Bitcoin project is 74% TypeScript?

For the Bitcoin project on Github clicking "Show language statistics" shows that the source code is almost 74% TypeScript. Why is this so when ostensibly Bitcoin is written almost entirely in C++. ...
0
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0answers
27 views

How does a protocol/wallet version change affect the connection handshake for previous versions?

This question is related to the bitcoin protocol and version changes. I have read the wiki and understand that a version check happens upon first connection to a node and if the version is of the ...
7
votes
1answer
443 views

Who made Gavin project leader?

I mean no disrespect to Gavin Andresen whatsoever. I think someone needs to be at the head of the project and Satoshi has stepped down / disappeared / gone back to the NSA / returned to his home ...
2
votes
1answer
226 views

Where can I access the original, Satoshi written Bitcoin code?

The articles of https://bitcointalk.org/index.php?topic=41718.0 seem to be annotated walkthroughs, and I'd like to see the raw code, as it was originally written in the first release.
0
votes
1answer
55 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 ...
3
votes
1answer
4k views

How to compile Bitcoin-Qt from GitHub source on Arch Linux?

Here are the instructions I have created so far: Install the necessary dependencies pacman -S boost boost-libs openssl db base-devel qrencode qt4 automoc4 Clone the GitHub repository: git clone ...
0
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3answers
856 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 ...
1
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2answers
65 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 ...
0
votes
1answer
41 views

Where is bitcoin.exe?

I need to make a request through cmd.exe (commandline), but the only .exe file I can find is bitcoin-qt.exe, which doesn't respond to "getinfo", "getaddressbalance", etc. How can I find bitcoin.exe to ...
1
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1answer
237 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 ...
0
votes
1answer
14 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 ...
2
votes
1answer
117 views

How does the satoshi client handle endianness?

I'm looking through the source code of the satoshi client, particularly into how transactions are serialized and sent through the network or stored to the disk. The CTransaction class has this block: ...
3
votes
3answers
10k views

How to resolve “no block source available” and

I've got some trouble using bitcoin-qt. It stays on: " No block source available... 242 weeks behind." And " Catching up ... Processed 0 " etc... Map port using UPnP is activated, and proxy disabled ...
2
votes
1answer
87 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
1
vote
2answers
865 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 ...
0
votes
1answer
55 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 ...
4
votes
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: ...
0
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2answers
228 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 ...
1
vote
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 ...
0
votes
2answers
85 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 ...
1
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2answers
118 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 ...
0
votes
1answer
28 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?
0
votes
4answers
79 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 ...
6
votes
3answers
1k views

Is there a way to not pay the transaction fees when using the standard Bitcoin client?

I tried sending one satoshi (0.00000001 BTC) to one of my friend and the client always showed a dialog prompting me to pay 0.0005 BTC in fee, with the only options being OK (pay the fee) or cancel ...
1
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0answers
27 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 ...
0
votes
2answers
107 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 ...
5
votes
1answer
577 views

How secure are the DNS servers for Bitcoin?

With the version 0.6, Bitcoin introduced the DNS servers that populate the initial peers for new clients. How secure are those servers in terms of being immune to takedown attacks, or injection of ...
1
vote
2answers
321 views

Where to place Bitcoin bootstrap.dat

I'm sure this has been asked many times before, but I've recently gotten into the whole cryptocurrency thing starting with Dogecoin, and I now want to use Bitcoin as well. I am on Windows 7. I found ...
2
votes
1answer
1k views

Data directory issue

I have everything set up normally. My only issue is that my data directory is in C:\Users\User Name\AppData\Roaming\Bitcoin. Normaly this is what you would want, but, if you noticed, my username has ...
2
votes
3answers
173 views

Address creation in standard client - random library?

Is the random library used by the standard client in any way deterministic, or can one count on it being truly random? For example, often random libraries are initialized with seed value of the ...
1
vote
1answer
79 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, ...
1
vote
0answers
52 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 ...
2
votes
2answers
1k views

How to move the blockchain data while still being able to use the wallet?

Using the standard client, Bitcoin-Qt, v0.8.1: I would like to move the blockchain data from its default location to a different location (maybe even an external disk or NAS drive). What should I do ...
1
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3answers
2k views

Stuck downloading block chain

I haven't started/used my Bitcoin client for ages but now whenever I start the client it is downloading block 135407 and it does not progress past it. What can I do?
1
vote
2answers
246 views

Cannot get Bitcoin-QT to run in testnet mode

I downloaded Bitcoin-QT for Windows 7 into: MYUSERNAME/Downloads/bitcoin-0.8.6-win32/bitcoin-0.8.6-win32 I want to run Bitcoin in testnet mode, so I created bitcoin.conf with only the following ...
11
votes
2answers
3k views

How to make Bitcoin-Qt client portable? (Windows)

It is a nice project and all, but I think in 2013 it shouldn't be a challenge to save all of an application's files into its own folder (maybe even by default), so you can use it without ...