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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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
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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 ...
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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
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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
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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?
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1answer
979 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
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1answer
445 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
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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
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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
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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
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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
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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 ...
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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 ...
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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
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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
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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
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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
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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 ...
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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
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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
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2answers
633 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? ...
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2answers
294 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
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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
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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
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1answer
604 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
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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 ...
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1answer
7k 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
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1answer
396 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
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1answer
384 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
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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
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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
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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
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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 ...
4
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2answers
805 views

How much time it takes to verify a Bitcoin signature in the Satoshi client?

Assuming: An average modern computer Using a single thread, as the current Satoshi client does Using the OpenSSL library, as the Satoshi Bitcoin client does The signature is not in the signature ...
2
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1answer
190 views

Will the block data saved or discarded after synchronization? Does it get removed when uninstalling?

When I first installed the program I noticed that it was synchronising with the network, and whilst it was doing so it was downloading blocks. I wanted to know if these blocks will be saved on my hard ...
4
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1answer
3k views

How to transfer addresses from Satoshi client to MultiBit?

I'm trying to take an address from my Satoshi client and transfer it into my new MultiBit client. I have found several questions similar to this, and have tried all their solutions, but to no avail. ...
8
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1answer
3k views

When importing private keys, will compressed or uncompressed format be used?

I am looking into implementing support for compressed public keys on Vanity Pool. However, I have my concerns about importing solutions into a desired vanity address under that format. From what I can ...
7
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2answers
1k views

Transaction confirmed by network but never showed up in bitcoin-qt

I've sent a large amount of coins to 1K7SzBTPGyyEtWsudwHpjg31LjrPf17qr4 but my bitcoin-qt client (V. 4.7.4) doesn't show any balance. 1) Under the "Receive coins" tab it shows the same address 2) The ...
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0answers
58 views

How to send transaction in Bitcoin-Qt without transaction fee [duplicate]

Possible Duplicate: Is there a way to not pay the transaction fees when using the standard Bitcoin client? How do I override the transaction fee in bitcoin-qt?
10
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4answers
6k 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 (...
0
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1answer
1k views

Bitcoin-Qt client: Easy way to using a wallet.dat not in its default location/when it asks for my password at all?

It doesn't have to be called "wallet.dat", right? That would be too obvious. Can you call it anything, with any extension? Bitcoin-Qt is just not so trivial to me to use since the trivial way would ...
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1answer
166 views

Are the original Bitcoin Qt client's developers around and can we ask them to consider a portable version? [duplicate]

Possible Duplicate: How to Make Bitcoin QT Client Portable? (Windows) That is my conclusion. It's better to experiment for myself that asking all these questions I have to restrict myself to ...
5
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1answer
358 views

Does the .bitcoin directory shrink in bitcoin-qt 0.7.2 and later?

The bitcointalk.org thread "Ultraprune merged in mainline" implies that a more efficient way of storing block information was introduced. Will this make the .bitcoin directory smaller after an upgrade ...
4
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1answer
336 views

Transaction shows up as sent, but was never recieved

I sent 0.002 BTC to 15bPd9YSB3kpuAFFz2tBZh39A3XdnN5UoX (I paid the transaction fee), but Bitcoin-Qt crashed when I pressed send. When I reopened it the transaction showed up, but it isn't in ...
12
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2answers
5k 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 installing/...
4
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1answer
3k views

How does Bitcoin keep track of account balances?

I downloaded the latest bitcoin client and am waiting for it to connect. How does it remember how much money a person has? Do I create an account and the balance is associated with the account each ...
3
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1answer
256 views

Double spending from “green addresses” & mitigation

Suppose a user pays for a service (service1) using a "green address" (0 confirmations required) and service1 needs to immediately respend it using it's own green address How many blocks should the ...
36
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2answers
44k views

How do I import a private key into Bitcoin-Core?

How do I import a private key into Bitcoin-Qt? bitcoind is nowhere to be found, and pywallet says it requires "bsddb" when I run it, which is also nowhere to be found. I generated some vanity ...
7
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1answer
2k views

How is locktime enforced in the standard client?

I am trying to study the locktime feature of transactions ( https://en.bitcoin.it/wiki/Protocol_specification#tx ). I have created some raw transactions in the testnet with different locktimes, but, ...
5
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1answer
438 views

What is the schema of the data stores used by the reference client?

I'm interested in seeing the schema (layout and indexes) that is used in the reference client. Namely wallet.dat, the bk** files and also the in-memory uncommitted tx. Does this exist anywhere for ...