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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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1
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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
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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?
5
votes
1answer
2k views

Can the transaction log history size scale?

Four Reasons You Shouldn't Buy Bitcoins, Forbes.com: Scaling. The Bitcoin protocol requires that every node in the network download a copy of every Bitcoin transaction that has ever occurred. ...
2
votes
1answer
824 views

Is bitcoin-qt as PPA really secure? How to proof?

With Bitcoins being that much worth currently, I came to the conclusion of using a unique old computer just for this "use case". I would like to run Ubuntu with bitcoin-qt (from PPA), but now the ...
0
votes
1answer
213 views

What are good ways to storing backup of an encrypted wallet?

What are good ways and places for storing backup of an encrypted wallet? When somebody open encrypted wallet what all can he do when he does not have a key? asuming that the key to the wallet is e.g. ...
2
votes
1answer
759 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 ...
4
votes
2answers
4k views

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

Using the standard client, Bitcoin-Qt, v0.8.1: (win10x64) 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 ...
0
votes
2answers
5k views

Bitcoin Transaction Unconfirmed [duplicate]

I made a transaction on March 13th, transferring .88 BTC from my desktop wallet to another account. I have a Mac and am using Bitcoin-Qt version v0.8.1-beta. The transaction did not go through, my ...
2
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1answer
1k views

How to update balance of imported address in electrum

Imported an address into electrum, but the balance of the address shows up as zero. Checked the address on http://blockexplorer.com and it's not zero. The address was imported from bitcoinqt when ...
-1
votes
1answer
489 views

bitcoin beginner, i have a few questions [duplicate]

I have a few questions about bitcoin and trying to wrap my head around it. 1) If people can generate bitcoins out of thin air on their computer how does it not mess with the value of the bitcoin? 2)...
3
votes
1answer
1k views

Bitcoin wallet/address balance confusion

I'm quite new to bitcoins so apologies if i'm being a noob, but I'm very confused! My bitcoin-qt wallet balance says I have 2.0113406 BTC (which is what I expect). Now if you check my transaction ...
1
vote
1answer
302 views

Synchronising with network

I'm completely new to Bitcoin but finding it all very interesting so far! My Bitcoin-qt wallet has been synchronising for literally days now (2 days actually) but it is getting closer, on 91% now. My ...
2
votes
3answers
565 views

Wallet.dat can contain only 100 private keys even if I back up?

Considering the Bitcoin client for Windows 0.8.1: So the best way (if I have already used up 100 keys) is to send bitcoins to different wallet and then to newly generated one? When I want new keys, ...
1
vote
1answer
2k views

Manual for Bitcoin-Qt on Mac OS X

Is there a manual for Bitcoin-Qt on the Mac OS X? Specifically, I'd like to move my wallet.dat to a different folder (a TrueCrypt volume) and if/how I may configure bitcoin.conf so that the ...
4
votes
2answers
6k views

“Failed to read Block”

I encountered a error whilst downloading Bitcoin-Qt on my Macbook version 10.6.8; it says "Failed to read block" How do I fix this error without losing the bitcoins currently in my wallet? Your ...
-1
votes
2answers
182 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 ...
4
votes
4answers
4k views

I ran out of space while synchronizing, how do I get my private keys & find my balance?

OK, my most immediate concern is that I made three ~$500 bitcoin purchases this weekend and downloaded the Bitcoin-Qt client, but ran out of HDD space just before it finished synchronizing the ...
9
votes
2answers
11k views

What does “Reindexing blocks on disk” mean?

When I upgraded to 0.8.1, it said Reindexing blocks on disk and it took about four days (Grr). But later, it said something about a corrupted database and it had to do it again! What is it doing?
1
vote
1answer
977 views

How to receive transaction in bitcoinj wallet

I am a real noob with bitcoin and bitcoin. I have a lot of questions and I don't know where to start. Let me try. I have a bitcoin-qt client and I downloaded the chain (took me one day) and now I am ...
0
votes
1answer
443 views

Open bitcoin-qt wallet with bitcoinj

I try to open the bitcoin-qt wallet with bitcoinj, I write this code: private static final File WALLET_FILE = new File("C:\\Users\\Bapt\\AppData\\Roaming\\Bitcoin\\wallet.dat"); public static void ...
2
votes
0answers
248 views

Bitcoin-qt database for BitcoinJ downloadBlockChain()

I am using bitcoinJ to develop a bitcoin based payment module for my project. I have the complete block chain downloaded/in sync with the network on the bitcoin-qt client. Is there a way I can use ...
6
votes
3answers
3k views

Mac 0.80b beta - says “database corrupted” and then Bitcoin-Qt quit unexpectedly

I can't run Bitcoin-Qt 0.80 on Mac OS X 10.8 any more. It starts up then says "System Error: Database Corrupted". I then click OK, and the program "quits unexpectedly" How do I start again without ...
2
votes
0answers
608 views

What is “failed to read block” and how can this be fixed? [duplicate]

When I try to open my BitCoin wallet, I get a "failed to read block" message and it will not open. What does this mean and how can this be rectified?
4
votes
1answer
3k views

technical question: receiving wallet.dat error

I have ~5 BTC on an old laptop (Windows 7) and I tried moving the balance to another client. At first I tried moving about 0.1 BTC just to see what would happen. The client debitted the balance but it ...
4
votes
2answers
594 views

Does the satoshi client always send the change of a transaction to a newely generated address?

Experimentally, this seems to be the case, but is it always like this or depends on some details? Also, does it generate a new address each time this is done, or first searches the wallet if there is ...
1
vote
1answer
3k views

Securing a wallet and multiple addresses

I am trying to understand Bitcoin QT. Sorry for the questions. If I create two new addresses, then encrypt my wallet and then create a third new address after the encryption process, are all three ...
0
votes
1answer
1k views

Lost my wallet password. Is there anything I can do? [duplicate]

I lost my bitcoin wallet password, it was stored on a USB and I've lost the usb. Luckily I have a backup of my wallet. Are there any way possible I can get my coins back? Is there a bitcoin wallet ...
5
votes
2answers
5k views

How can I tell if my Bitcoin-Qt wallet is protected with encryption?

I am a new adopter of Bitcoins, forgive the ignorance. (note these are test transactions) I am using the Bitcoin qt client and I am very confused and think I have done something wrong. I have two ...
6
votes
1answer
1k 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 ...
4
votes
2answers
2k views

Why does blockchain.info show a different balance from bitcoin-qt?

I just created a wallet on blockchain.info by importing my wallet.dat from Bitcoin-QT. My Bitcoin-QT shows a balance of 3.991 BTC, while blockchain.info shows a balance of 3.016. Where does the ...
4
votes
1answer
966 views

Why does Bitcoin-Qt use hidden private addresses?

As I found out from this question default wallet contains 100 private keys but only makes one visible. But what I don't understand is why Bitcoin using those "hidden" addresses? I've been using my ...
1
vote
1answer
1k views

how to solve this error ? and use detachdb?

I got the following error Error initializing database environment /home/rune/.bitcoin! To recover, BACKUP THAT DIRECTORY, then remove everything from it except for wallet.dat. when I run ...
3
votes
2answers
3k views

Bitcoin-qt v0.8.0b client on Mac OS X 10.8 crashes, why?

I was running the stable 0.7.2 bitcoin-qt client (under OS X 10.8.2) for a couple of weeks, with the block-chain completely sync'ed on an ongoing basis. No transactions in my wallet. I upgraded to ...
7
votes
2answers
630 views

What alternatives are there to hardcoding checkpoints into the Bitcoin client?

Checkpoints seem like a crucial part of the security & validation apparatus in Bitcoin. Is there a written policy in place, among the developers defining the maximum interval between checkpoints? ...
13
votes
2answers
293 views

What are the privacy implications of filtered blockchain downloads?

There is now "Bloom filter" support in the network protocol for sending only relevant transactions to lightweight clients. What are the privacy implications of the bloom filter? Does it leak any ...
11
votes
1answer
679 views

Does the official Bitcoin version 0.8. client still download the whole blockchain?

The release notes for version 0.8 of the "Satoshi" client say "Bloom filter" support in the network protocol for sending only relevant transactions to lightweight clients. Is this an optional ...
7
votes
1answer
2k views

Port forwarding plus Bitcoin

Bitcoin has only 8 active connections, and I read somewhere that it helps to forward ports. I know how to forward a port, but which port should I forward, and how should I tell Bitcoin-qt to use the ...
2
votes
1answer
603 views

My bitcoin-qt client connection status and uptime at http://blockchain.info/connected-nodes does not show reliably - why?

I've been running a Bitcoin-qt client (v0.7.2 beta) on my Mac for over 24 hours, with blockchain fully sync'ed. I checked http://blockchain.info/connected-nodes at various times for my IP address. In ...
15
votes
3answers
6k views

How can I limit bandwidth usage in Bitcoin-qt client?

I've just finished the intial blockchain download/verify in my BitcoinQt client (17 hours..) and I now see that BitcoinQt is happily eating all of my upstream bandwidth. (About 110kByte/sec on my ADSL ...
1
vote
1answer
6k views

cant see bitcoin after restore of backup [duplicate]

I made a backup of my Qt wallet. The blockchain never got completely downloaded and i was sent a bitcoin that i never saw in my wallet as the downloading of the blockchain never caught up with the ...
3
votes
1answer
386 views

Which version of the JSON-RPC protocol does Bitcoin use?

I would like to get some clarification on which version of the JSON-RPC protocol does Bitcoin use? 1.0 or 2.0?
4
votes
1answer
383 views

What server-side Bitcoin clients are available to serve information?

I have been toying around with the idea of building a bitcoin app. My research has thus far led me to conclude that it makes sense to run a bitcoin client daemon on my server in order to provide an ...
4
votes
1answer
217 views

Why is it important for checkpoints to contain well-formed blocks?

In the source code of the standard client, checkpoints.cpp has this comment: // // What makes a good checkpoint block? // + Is surrounded by blocks with reasonable timestamps // (no blocks before ...
3
votes
2answers
864 views

Transaction delayed >12 hours by Satoshi Bitcoin client

Yesterday I sent 20 BTC to 1Hj8kJ3rq4c4Hn9Prtw45Zue791f4Nc9L3 with a 0.0001 fee and transaction Id 30d1ef9aa05898b11b5ee4f5f5e703a822a821fb499c647b658fc3cb67a899b8. My Satoshi client said today that ...
8
votes
2answers
14k views

Does the program I downloaded (bitcoin-qt) mine bitcoins? [duplicate]

Possible Duplicate: How can I start mining Bitcoin? Nothing ever says how to actually mine bitcoins, except to join a pool. I don't want to do that. All I really know is that each block has an ...
3
votes
2answers
3k views

I sent bitcoins to my wallet before it had synced. is there ANY way i can get my coins back? [duplicate]

I downloaded Bitcoin. qt and started the sync (which was going to take about 6 days UGH) so about 4 days into it i tried to open the app and Now the app shows "error loading blkindex.dat" So i cannot ...