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Questions tagged [bitcoin-core]

This tag should be used for questions pertaining to Bitcoin Core. Bitcoin Core is an MIT-licensed Qt 5 GUI application for the original Bitcoin codebase. Additional/previous names include "Bitcoin-Qt", "Satoshi-Client", and "Standard Client". This tag should be used when referring to the Bitcoin Core software.

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4
votes
1answer
219 views

Send coins from another adress

Newbie here! I need to confirm something: I have bought bitcoins and I already see them in the QT client I am using. I now want to send the bitcoins using a different address than the one I use to ...
3
votes
0answers
32 views

Bitcoin-QT Merge Question [duplicate]

Can one import wallet.dat into Bitcoin-QT without overwriting the current wallet? Kind of like a merge function? Or is Blockchain.org the only we to merge wallets together under one account?
2
votes
1answer
2k views

Do I need to wait for Bitcoin-Qt to sync with the network before using GUIMiner?

I'm waiting for Bitcoin-Qt to synchronize with the network, but it takes a long time. I'd like to know if I can start using GUIMiner while it's Bitcoin-Qt is still synchronizing.
3
votes
2answers
2k views

What does Bitcoin-Qt “Change Passphrase…” do to existing private keys and corresponding addresses?

"Change Passphrase..." obviously lets me encrypt the wallet with a new string of text. I think (correct me if I'm wrong) that this creates new private key(s) inside wallet.dat. How are existing ...
45
votes
4answers
149k views

Import wallet.dat into a new Bitcoin-Qt client

I had Bitcoin-Qt on my computer with several bitcoins in my wallet, using Vista. Then my computer crashed. Finally I was able to get my computer fixed and download a new version of Bitcoin-Qt. Now I ...
1
vote
1answer
1k views

Bitcoins didn't arrive to new wallet

I use Bitcoin-Qt. Decided to make another wallet and transfer some bitcoins there. Wanted to give that wallet to my friend as a gift. What I did was: renamed wallet.dat file to 1_wallet.dat started ...
4
votes
2answers
4k views

How do I switch from Bitcoin-QT to a lighter, faster (SPV) Bitcoin client?

So, keeping up to date with the blockchain is getting ridiculous in Bitcoin-QT, especially on my laptop. If I leave it off or away from the internet for even a short period of time, it takes forever ...
7
votes
2answers
4k views

What does qt in bitcoin-qt stand for?

just a simple question: what does qt in bitcoin-qt stand for?
1
vote
1answer
1k views

Using the main Bitcoin-Qt Client, can you change where it stores the block chain? [duplicate]

I don't want 12 gigabytes stored on my boot drive. Can I change where the Bitcoin-Qt stores the block chain?
11
votes
1answer
11k views

How to transfer only the blockchain to a friend's computer?

After installing the bitcoin client (Qt) a friend got interested as well. He doesn't have as fast an internet connection, though, so I thought of burning some DVDs with the blockchains for him to have....
0
votes
1answer
110 views

Upcoming Fork - Wallet Safety [duplicate]

In downloading the newer client, do I need to worry about my addresses and hence bitcoins disappearing, or will everything in the old wallet transfer nicely into the new?
6
votes
2answers
4k views

How does the signature verification feature in bitcoin-qt work without a public key?

bitcoin-qt has a "signature verification" feature where you can verify a signed message. All it needs is the bitcoin address of the signer, the message and a short signature. From what I understand ...
2
votes
1answer
1k views

How to utilise more cores when I am cpu mining?

This is purely an experiment for fun. This is for litecoins but can bitcoin people help me too :) I am using litecoinqt to solo cpu mine, on my windows machine. Threads set between 4 and 10, scantime ...
2
votes
1answer
240 views

Buying Bitcoins using Guyana Dollars

Does anyone know what is required to establish an exchange that accepts Guyana $ as payment for Bitcoins?
1
vote
1answer
1k views

Bitcoin-Qt Command line - adding private key - Mac OSX

I recently created a custom Public key (with vanitygen) and i would like to add the corresponding private key to my bitcoin-Qt wallet client. I have started bitcoin-Qt in server mode using: $ open ...
15
votes
1answer
13k views

How do I specify in which directory Bitcoin blocks and other data should be stored? [duplicate]

I am on Windows and installed the Bitcoin wallet. The block folder seems to grow bigger everyday and is stored on my C drive in the roaming directory. I would like to set this to some other folder on ...
3
votes
1answer
274 views

Is there a command I can type into Bitcoin-Qt to see the total number of bitcoins that have been created?

I know how to obtain this information from other means, I specifically want to know if it's possible for me to obtain this information using the Bitcoin-Qt client alone. I am running it on Windows ...
4
votes
3answers
2k views

Is the synchronization process supposed to be downloading at less than 5kB/s?

I've been running the bitcoin-qt client for over a week now trying to catch up with the block chain (closer to three weeks if I count the first time I had to synchronize everything). Looking at my ...
7
votes
2answers
2k views

No menu in Ubuntu bitcoin-qt

When I run bitcoin-qt on Ubuntu 12.04, I see this: As you can see, there is no menu on the top menu bar. There is the "beginning" of a menu with the word "Bitcoin" but there are no "File", "Settings"...
0
votes
1answer
141 views

How do I know how much each address own in a wallet?

My wallet has 3 address. One main address is shared with my other computer. The other addresses are not. Does money belong to a specific address or to a whole wallet? What happen if I send money to ...
2
votes
0answers
179 views

Changing settings of Bitcoin-Qt on Mac [closed]

I am using Bitcoin-Qt on my Mac under Mac OS 10.8.3. Everything is working fine but when I want to change any settings in the settings menu, it will never remember my new settings. Is there any ...
2
votes
2answers
764 views

Are change addresses visible from the GUI in the Bitcoin-QT client?

I've seen this question pop up on reddit multiple times, and I don't know the answer. However, I do know that in my own wallet, several unlabelled addresses have appeared over time without me ...
5
votes
2answers
7k views

What other wallets can import Qt's backup .dat file?

I've been using Bitcoin Qt on my work computer (my only working computer at the moment) but last week Windows 7 decided that the program's bypassing the firewall to download the blockchain was a ...
1
vote
1answer
726 views

Account Balance and Bitcoin-QT

I'm attempting to clarify a few things in my mind. The wallet.dat file contains (amongst other things) my transaction history alongside the private keys associated with each address in use in the ...
3
votes
1answer
2k views

Testnet Bitcoin Generation Time

2 Parts to this. 1st - What is a typical winning block (I get coins) generation time when running on testnet. Ive done numbers with calculators and all that but given I cant work out accurately ...
0
votes
1answer
351 views

Bitcoin-Qt Signing

When you send money, does Bitcoin-Qt automatically sign the transaction? On the Receive Coins tab, why is there a Sign Message button? Which message am I signing? There is no Send Message button, ...
3
votes
2answers
4k views

Bitcoin-qt Not Syncing with errors [duplicate]

My bitcoin-qt (on ubuntu installed via the PPA) just plain won't sync. It's been running for days and no/little progress past ~82256 blocks remaining... I've also got an error displaying "Warning: ...
8
votes
2answers
10k 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 ...
2
votes
2answers
539 views

When do I have to backup wallet.dat?

Is it obligatory to backup wallet.dat after each outgoing transfer? I understand it is, but not after each incoming transfer.
10
votes
1answer
3k views

Does the Bitcoin Qt client have a minimum transaction fee?

I'm trying to transfer all of my 0.1 BTC located in one wallet to another wallet. I don't care how long it takes to finish, so I'd rather send it without paying any transaction fee. I'm new to this, ...
4
votes
1answer
285 views

Why do first bitcoin transactions receive most confirmations?

My very first Bitcoin transaction has 740 confirmations, the next have 239, 212, 70, 43, 5, and 5, respectively. Is this just because my first transaction has had more time to get more confirmations, ...
5
votes
1answer
249 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?
1
vote
1answer
1k views

Block data error, reindexing blocks

Bitcoin QT finished syncing this weekend after d/l for Windows 7 on Thursday. Today, probably 2nd or 3rd time running it, an error came up right away that index could not be found. What would cause ...
1
vote
1answer
395 views

How much time does it take for the bitcoin-qt window to show up in OS X 10.4?

I have downloaded Bitcoin-Qt for Mac yesterday. I understand that it takes a while to "synchronise" but this site says one can access it whilst this process takes place. I have the Bitcoin in my ...
1
vote
0answers
184 views

How to export an encrypted non-seedless electrum wallet into bitcoin-qt?

How to export an encrypted non-seedless electrum wallet into bitcoin-qt? Is it even possible? Cheers
4
votes
2answers
2k views

transaction creation failed

I am using bitcoin Qt version v0.7.0-beta and when I tried to send a transaction (1.5 bitcoins) I received a message transaction creation failed what can be the reason? Few minutes ago I sent 0.1 ...
2
votes
1answer
2k 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 ...
4
votes
2answers
2k views

Why would Bitcoin-QT attempt to charge a processing fee, when I have my transaction fees set to zero? [duplicate]

I'm attempting a test transaction of an amount less than 0.0015 BTC with my transaction fee set to 0 BTC, yet I'm getting this message: The total exceeds your balance when the 0.0015 BTC ...
3
votes
1answer
1k 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 ...
2
votes
0answers
2k views

Importing a backed-up encrypted wallet.dat

I have bitcoin-qt-0.8.1-beta installed on a computer. I also have another computer in which I'd like to share the same wallet. First, for backup purposes, I have exported the wallet into a backup ...
9
votes
1answer
2k views

Easiest way to control a remote bitcoind instance?

What's the easiest way to control bitcoind running on a remote machine? I'd like to make transfers, manage my wallet, etc, and ideally I'd like to do it using a UI such as bitcoin-qt. Unfortunately ...
5
votes
1answer
439 views

How to turn off “change” address in bitcoind?

I would like to keep backup of my wallet on paper, but that's impossible or at least impractical when the bitcoind keeps creating new addresses for "change". I know it is possible in theory to do it ...
4
votes
1answer
143 views

Why do I need my password to generate a new receiving address in bitcoin-qt?

I heard that the wallet has 100 of the next receiving addresses already. Shouldn't I be able to get one of those without unlocking it?
3
votes
1answer
180 views

Older Clients & Wallets

I have about 5 BTC stored in Wallets created under different versions of Bitcoin, all encrypted with multiple backups. I downloaded latest Client and it doesn't work with the wallets, I've gone back ...
1
vote
1answer
757 views

Bitcoin-qt Wallet empty

I just reinstalled Bitcoin-qt and exchanged the new wallet.dat file with my old one. The Address for receiving coins is shown correctly in Bitcoin-qt but the balance is 0.00 BTC. The Block chain is up-...
1
vote
2answers
4k views

How to activate the mining process in the standard bitcoin client?

I have done the whole synchronization and now it should be mining bitcoins from what I understand but I don't see anything showing that it is actually mining for bitcoins nor any activity from my cpu… ...
3
votes
3answers
1k views

Bitcoin Client - How do I find the destination address of an incoming transaction?

I'm mining Bitcoins and have multiple incoming addresses in my bitcoin-qt wallet. When I get a payout for mining in the "Transactions" tab it shows the amount of BTC I received and the type is set ...
22
votes
5answers
36k 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 ...
16
votes
1answer
4k views

getrawtransaction error? [Code -5]

I'm trying to read raw transactions but there is a problem; Seems like getrawtransaction only works for recent transactions, old transactions give me the next error: No information available about ...
1
vote
2answers
25k views

How do I recover an encrypted bitcoin wallet to which I don't know the password? [duplicate]

My husband died recently. He had a Bitcoin-Qt wallet with some bitcoins. I don't know the password and the wallet is locked and encrypted. Is there anyway to regain access to the wallet?