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

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Bitcoin Cold Storage Question

I am ready to put some of my BTC holdings into a couple different cold storage wallets. I went through the process already moving around a few mBits as tests, created the keys on an offline PC, sent ...
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1answer
20 views

How can I use multi signature addresses with Bitcoin Core?

Using the instructions on the debug window, I created a multi signature address as below: addmultisigaddress 2 "[\"Adres1\",\"Adres2\"]" MultiSigAddres My understanding is that one needs the ...
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17 views

Empty amount sent with bitcoind

i am usng JSON PHP to send money from my address to another one, He send the first time normally, tested with (0.002 BTC) And when i test second one, he send empty AMOUNT (0.0 BTC) and charge for ...
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7 views

Bitcoind not make auto rescan [on hold]

There idea on how to make bitcoind do an auto RESCAN ? Because when i receive payment balance not updated automatically, there a way to be updated automatically when receive payment ? I use ...
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1answer
746 views

Does Bitcoin-QT use more CPU when its idle than during synchronization?

I am running the standard client on a micro Amazon EC2 instance. When I am synchronising Bitcoin with the network, it uses about 50% of the available CPU. After it is fully synchronised, I leave it ...
4
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1answer
294 views

Bitcoin-qt falls behind on blockchain, how to replace?

On Apple Mac, bitcoin-qt is 14 days behind. Never approaches current time. Have downloaded current blockchain from trusted source. Where to install? What procedure?
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11 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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2answers
87 views

Bitcoin-qt data on external drive

I have done the instructions listed here: How to move Bitcoin data from Application Support on external drive [mac] It works fine for a flash drive connected the mac, but I wanted to have the data ...
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1answer
651 views

What to do about a “stuck” transaction?

I started the standard client with --rescan instead of -rescan after switching wallets and before synchronizing with the latest blockchain, and made an going transaction. This transaction got ...
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2answers
24 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 ...
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1answer
33 views

Just installed bitcoin, but it won't connect

Total newbie at bitcoin; long time Linux user. kubuntu precise 64: My first attempt was just to download it (a slightly older version than the one from the ppa below), untar it and run the ...
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11 views

Bitcoin-Qt & External Device

Can Bitcoin-Qt be configured to use an ASIC miner? If not, do I need to use other miner software such as bfgminer?
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28 views

Bitcoin-Qt & Bitcoind

The wiki states that the client and the headless client are now bundled together, however, when I downloaded the Bitcoin-Qt client, I cannot seem to get bitcoind to run via terminal. I tried to ...
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1answer
23 views

Bitcoin-Qt & Bitcoin.conf

Just confirming here ... Does Bitcoin-Qt require that I create a bitcoin.conf file in order to solo mine on my Mac? I created one after reading the wiki and placed it in Lib/AppSupp/Bitcoin but I am ...
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13 views

Bitcoin.conf & Connect=

When configuring the bitcoin.conf file, what should you put in connect= ? There are IP addresses listed here, so I removed the # sign and left them as is. I also entered my WAN address and my local ...
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0answers
12 views

Bitcoin-Qt & setgenerate true

Will Bitcoin-qt mine bitcoins if all I have done is downloaded and installed Bitcoin-qt, and typed in "setgenerate true" into the console? Are there other steps or configurations necessary? If so, ...
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0answers
12 views

Bitcoin.conf addnode

What should I enter on the "addnode" line of the bitcoin.conf file? I removed the # sign and used the nodes provided on the template, but cannot verify is this was proper or appropriate. Please ...
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1answer
149 views

Bitcoin-Qt listing all Transactions as occurring at same date and time

Any ideas about this one? I've imported addresses into my wallet and on rescan, all transactions come up as same date and time?
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2answers
1k views

How to decode private key from Android Bitcoin Wallet?

I want to import my private key from the android's Bitcoin Wallet (the one created by Andreas Schildbach) but it can export it only in an encrypted way. How do I decrypt the file so I can import the ...
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2answers
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. ...
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2answers
119 views

Transaction fees after 0.9 protocol update

As the changelog of bitcoind 0.9 tells, transaction fees should be greatly reduced. What are the implications of this? How were transaction fees determined before the change and after the change? ...
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17 views

Heartbleed bug and Altcoins - Another question [on hold]

In reference to the post: Heartbleed bug and Altcoins I have this questions to the answer posted there: Do you mean that if we created the coin.conf file for any alt coin wallet with this kind of ...
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1answer
38 views

Qt client not exiting on Linux

I am running Ubuntu 12.04. When I close bitcoin-qt (or any of its derivatives, like litecoin-qt or dogecoin-qt), sometimes it does not completely exit. I then have to run killall -9 bitcoin-qt, or ...
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2answers
853 views

I sent my bitcoins from LocalBTC to a unsynced bitcoin wallet program, the bitcoins are not showing up. How do i get them back?

I sent bitcoins from localbtc wallet to a unsynced program, it says 0 in the balance of the program and I really want them back.
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1answer
38 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, ...
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2answers
6k views

how do I create and encrypt a dogecoin wallet?

I've looked at the dogecoin wiki, but don't see any resources explaining how to actually create a wallet and encrypt it. I'm running dogecoin-qt on Linux. Under "much receive" on the GUI, I can add ...
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3answers
72 views

How can I send bitcoin from one address to another through the Bitcoin client/API?

How can I send bitcoin from one address to another via Bitcoin client/API ? There exist an API call called: sendfrom <fromaccount> <tobitcoinaddress> <amount> [minconf=1] ...
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2answers
158 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?
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2answers
60 views

Cannot connect to bitcoin-qt server

# server=1 tells Bitcoin-QT to accept JSON-RPC commands. server=1 # You must set rpcuser and rpcpassword to secure the JSON-RPC api rpcuser=bhhtufhrt rpcpassword=ferhrhh im trying to connect ...
2
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1answer
37 views

How can I download the blockchain from own, trusted source?

I have two computers with two different bitcoin-qt wallets: Very heavy-weight desktop with a great internet connection. Less powerful laptop with relatively slow internet. I would like to download ...
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1answer
28 views

How do I flush the keypool?

After the heartbleed vulnerability, I'm concerned that my private keys could have been compromised. I want to send all my coins to a new address with a freshly generated key. However, if I just ask ...
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0answers
30 views

Can I download blockchain updates from somewhere?

I use Bitcoin only on rare occasions - say once every month. I want to avoid long waiting times for downloading and verifying blocks that consequently await me when I reopen bitcoin-qt. There are many ...
1
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1answer
27 views

Which wallet application lets you send to multiple output addresses with just 1 fee?

Which wallet applications lets you send to multiple addresses from one output? I'm looking to build a physical bitcoin kiosk faucet and was looking to see how I would avoid miner fees if i combined ...
5
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1answer
75 views

Transaction refund address

In the what’s new in Bitcoin Core 0.9.0 notes there is a reference to a refund address. I tried to look it up in the forums and the wikis but I came up with nothing. How can I set a refund address ...
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1answer
267 views

How to make a payment processor like bitpay which accepts bitcoin

I know it's a tough one,but it's urgent ,I know there exists some other payment procesors like BIPS,BitPagos,BTCMerch and few more like that.So I just need to know how to go about making a website ...
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1answer
100 views

How can I create a new wallet on Bitcoin Core?

How can I create a new wallet on Bitcoin Core (Bitcoin QT)? I forgot my old password, so I can't create transactions using the old wallet. I don't have money on my old wallet, I just need to create ...
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3answers
112 views

Ubuntu command to download https://launchpad.net/~bitcoin/+archive/bitcoin/+packages

What command do I use to get the latest bitcoin package under Ubuntu desktop 12.04 LTS? Also, what needs to be done to uninstall previous versions?
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1answer
8k views

Bitcoin-Qt setup: Change block-chain file location, settings? documentation?

I am installing Bitcoin-Qt and have been reading about Bitcoin basics, but I found very little information on the client. I have a few questions about the Bitcoin-Qt program (v0.8.1-beta under Windows ...
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2answers
380 views

Old bitcoin wallet not working

So Im having a bit of a problem with my bitcoin wallet. See, I got into bitcoin about 2 years ago, back when bitcoins were worth very little real money, if any at all, but I managed to get quite a ...
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1answer
250 views

Move bitcoin data from Windows to Mac

Is it possible to move the Blockchain data from Windows to Mac? The wallet on windows is synced, the one on mac is not. The wallet on Mac has had some bitcoins sent to one of its addresses. Would it ...
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1answer
179 views

How does blockchain.info get the addressbalance / seen date?

I am trying to figure out how blockchain.info gets the following API functions and is there any way to do these calls on a server (without using their API) perhaps through bitcoind? ...
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1answer
145 views

How can I move bitcoin-qt blockchain data to bitcoind daemon?

I have a bunch of files like blk00110.dat now that bitcoin-qt (on my mac) has finally updated. I'd like to just move this over to my linux box so I can keep it up and running but the bitcoind program ...
2
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1answer
600 views

Saved .bitcoin directory full ~9 GB block data, won't work when copied to another system

I had to delete my .bitcoin directory in Ubuntu 12.10, after months of getting the near 9 GB of blk data files. I copied everything over to another machine (and back to the original too) and it gives ...
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0answers
12 views

including a conf file in util.cpp

i am including some code to generate a config file when anyone runs the qt wallet. its just like bitcoin, but a change from maxcoin. this is the code that i included in util.cpp ...
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1answer
264 views

Bitcoin wallet shows empty after I installed Windows on SSD

My PC stopped working a while ago (BSoD on every restart). I bought an SSD and installed Windows 7 64-bit on it (same as I had on my HDD). I then attached the HDD back into my PC and intended to back ...
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4answers
922 views

Different balances Bitcoin-Qt vs. Blockchain.info

Why is the balance in my Bitcoin-Qt wallet different from the balance when I check the information about my address on blockchain.info? All transactions are confirmed.
23
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1answer
22k views

How can I restore my wallet?

I just purchased a new laptop and I want to decommission my old one. I have a back-up of my wallet.dat file copied to my new PC. What do I need to do to restore it to my Bitcoin (Windows) client? ...
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1answer
174 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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1answer
52 views

Is change of Bitcoin address of an account possible?

I have multiple Bitcoin addresses in my Bitcoin Daemon, Which address will be used for receive transaction Can i change my default account address(mentioned in 1) to new one