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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8
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1answer
8k views

What exactly did `Bitcoin-Qt -rescan -reindex` do?

I spent a ton of time today trying to get Bitcoin-Qt to sync using the bootstrap.dat file and could not get it to work. I found an answer on this forum saying to use: /Applications/Bitcoin-Qt.app/...
1
vote
1answer
662 views

Automatically Get Bitcoin Difficulty, Bitcoins/Block, Exchange Rate Statistics [duplicate]

What can I do to programmatically get statistics such as current Bitcoin difficulty, Bitcoin award per block, USD/BTC exchange rate?
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3answers
244 views

For Application Development is bitcoind RPC the Only Way?

I am looking at building an application using Bitcoins, and being a newbie the only real resources I have found regarding how to interact with the network is to issue RPC commands to the bitcoin-qt ...
2
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0answers
543 views

What JSON RPC commands are suitable for a multi-tenant wallet service?

I'm looking at the JSON-RPC commands available in the QT client so I can create a multi-tenant wallet service on top of it. In other words, people would sign up for my site and have the ability to ...
13
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3answers
16k 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.
1
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2answers
954 views

Should I keep my bitcoin-qt wallet running all the time?

It can take a day or more to get in synch, so it's somewhat problematic to only start it when I want to transact. But are there any security issues in keeping it running constantly? What's the ...
1
vote
1answer
581 views

Reindexing of blockchain using bitcoin qt v8.5 using 427% of Macbook CPU

My bitcoin qt client v8.5 crashed last week (I had already got full blockchain indexed a long time ago) and I had to force quit it. It's now re-indexing the blockchain but using sometimes up to 427% ...
0
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2answers
581 views

How do bitcoin qt sign signature/messages work? [duplicate]

In bitcoinQT what is the sign message for? I'm not exactly sure what I can use this for. can someone give an example of how this would be used in a layman way? nothing too technical please. also ...
0
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1answer
54 views

New Bitcoin-Qt install but can't set passphrase [closed]

I have installed bitcoin-qt version 4.6.2 through the ppa:bitcoin/bitcoin ubuntu repository. I can't set a pass-phrase because it requires a value as the old pass-phrase. I have never created an old ...
11
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3answers
26k views

Can I earn transaction fees by running as a full node, verifying transactions, but not mining?

As I understand it, by running a full node (i.e. Bitcoin-QT) , I am helping confirm transactions and contributing to the Bitcoin network. When transaction fees are offered, do I receive these, and ...
1
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2answers
397 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 ...
1
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1answer
190 views

Bitcoin QT Rpc Transaction date format

I am trying to get information about my transactions from my wallet, I use Listtransactions, and get all the information, but the time/blocktime/receivetime - there are all in number i can't decipher ...
3
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0answers
314 views

How to ignore balance check to cancel unconfirmed transaction (double spending)

I need to cancel a transaction that was sent without fee (using Blockchain.info). It is currently "Unconfirmed". The only way I have found is to do a double spend of the whole wallet, specifying a ...
0
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2answers
646 views

Why does my wallet say that I have 0.00BTC and 8.91 unconfirmed, when I had done nothing with them?

Here is my BTC wallet page. Is it normal that I have 0.00 ?
1
vote
2answers
157 views

Why does the Satoshi client not use blocking synchronous communication with peers?

Why does the Satoshi client not use blocking synchronous communication with peers? I think that is mush simpler than the current asynchronous scheme. I mean after a node sends out a request, it waits ...
5
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2answers
827 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 ...
1
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0answers
564 views

Cannot synchronize with Bitcoin 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 ...
3
votes
2answers
3k 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 ...
3
votes
1answer
95 views

Bitcoin-qt Show Transaction Details

When looking at the details of a transaction (Show Transaction Details), the From: field is always set to 'unknown'. Is it possible to add a 'From' parameter to the API so some meaningful description ...
3
votes
2answers
335 views

Which scripts are currently considered standard and therefore actually propagated?

All I've learned about script so far is that while theoretically quite versatile (e.g. allowing multisignature transactions) most scripts are simply not propagated by the default client nodes, i.e. ...
1
vote
1answer
327 views

Import bitaddress.org wallet into Bitcoin-Qt client? [duplicate]

I've received some bitcoins in a wallet created by bitaddress.org, and I've saved a screenshot of the webpage that has the public/private keys and the QR codes: I've now downloaded the Bitcoin-Qt ...
1
vote
2answers
299 views

cURL to Bitcoin-Qt on Mac fails

I followed gavinadresen's answer at Bitcoin-Qt command line control on Mac. When I enter the following in terminal, it works: open Bitcoin-Qt.app --args -server I've put in the following into my ...
1
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1answer
185 views

CPUMiner - Do I also need to download Bitcoin client and 15gb chain?

Just out of curiosity, I downloaded cpuminer, signed up at a mining pool site and started the miner. It seems to be doing something. [2014-01-22 22:51:09] 1 miner threads started, using 'sha256d' ...
0
votes
1answer
131 views

Where/How does Bitcoin-qt check for receives to it's addresses?

How does Bitcoin-qt technically check for receives to it's own addresses. I know it has a list of addresses loaded in from the wallet.dat, but when a new block or new transaction arrives, what logic ...
4
votes
2answers
7k views

How to use the bootstrap.dat in Mavericks?

So I'm trying to sync with the network in Bitcoin-Qt, but I just can't seem to make use of the bootstrap.dat file that I downloaded, which is annoying because it will be awfully slow to sync without ...
2
votes
2answers
124 views

Where can I find the bitcoind bundled with bitcoin-qt in Ubuntu?

I read that bitcoind comes bundled with bitcoin-qt, but I can't find it anywhere on my system after installing bitcoin-qt. I'm using Ubuntu.
2
votes
2answers
8k views

How to export public key for an address in bitcoin-qt?

With the probable increase in demand for multi-sig (P2SH) addresses, and since the procedure for creating such addresses requires that each participant provides the uncompressed public key for an ...
8
votes
2answers
8k views

Backing up my bitcoin wallet - is wallet.dat all I care about?

I know that there are many duplicates of this but I'm hoping that the way in which I word this explains and helps not just me, but others as well. In any of the coin wallet bitcoin and the alt coins,...
9
votes
2answers
398 views

Satoshi's bitcoind implementation bugs

I have seen referred in a couple of locations (bitcd and bitcoinj) that fully verifying clients should match the satoshi bitcoind client implementation, including its bugs, presumably to prevent ...
0
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1answer
468 views

Why on bitcoin client sender address is 'undefined'

Despite the fact that bockexplorer allows to navigate through transaction details and discover the sender address, why via bitcoin client the sender address remains 'undefined'. Is it possible to ...
2
votes
1answer
353 views

mapOrphan overflow, removed 1 tx

I'm trying to download the block chain and synchronize with the network (using Bitcoin-qt 0.8.6). I have a 2 year old wallet.dat file with a fractions worth of unconfirmed bitcoins. After over a day ...
3
votes
2answers
16k 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 valuation,...
1
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0answers
167 views

Nonstandard script - TX rejected

I am experimenting in testnet with nonstandard scripts. There was a transaction, created by me, with the following vout script: OP_HASH256 ...
1
vote
3answers
4k views

Why is Bitcoin-qt using my CPU at 100%?

I am running Windows 7, and every time I open Bitcoin-Qt (v0.8.6-beta) during synchronization my CPU runs at around 95% according to the Windows Task Manager. As soon as synchronization is finished, ...
2
votes
2answers
4k views

How to avoid Bitcoin-QT's transaction fee or change size limit?

I'm trying to find an easy way to enable my website to accept bitcoin payments. I'm trying to test out Blockchain.info's "receive payment API" (http://blockchain.info/api/api_receive). Near the ...
0
votes
1answer
1k views

How to import a private key in bitcoin-qt? [duplicate]

I've a paper wallet with privatekey which is created using coinbase.com. I want to import it in bitcoin-qt but I don't see an option in bitcoin-qt UI.
3
votes
1answer
94 views

What is happening after backup?

Let's say I have a wallet backup burned on a CD. In that moment I have 10 coins. And I start to make transactions. Then my hard-drive crashes and in the moment of crash I have 20 coins. When I restore ...
3
votes
5answers
399 views

As a small hotel accepting bitcoins, do I show only one payment address?

I am currently accepting bitcoins as payment at my hotel, but I am uncertain about the payment address(es). I prefer to avoid payment service such as BitPay and Coinbase to mention a few. At this ...
0
votes
1answer
45 views

why i can't find blk0001.bat and blkindex.bat on my computer

my bitcoin-qt client'data is at the "C:\Documents and Settings\Administrator\Application Data\Bitcoin", but i can't find the blk0001.bat and blkindex.bat two files on this dir
0
votes
1answer
2k views

bitcoin-qt keeps on quitting with “failed to read block”

I just wanted to install bitcoin-qt on another machine (all others are working fine) but I cannot seem to retrieve the block chain using bitcoin-qt 0.8.6-beta (as downloaded from http://sourceforge....
0
votes
1answer
121 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 ...
5
votes
1answer
2k views

Bitcoin-Qt source code walkthrough

Has there been content published which provides an overview of how the Bitcoin-Qt software is architected? I would like to dive into the source code, but going from scratch is somewhat taxing. Can ...
0
votes
1answer
86 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 ...
0
votes
1answer
358 views

Setting up Statistics with litecoin-qt or bitcoin-qt

I'm trying to set up a bitcoin/altcoin pool server, but I've run in to a bit of a problem, I have no way to verify I've connected to the pool succesfully, and no stats or informations on the actual ...
15
votes
3answers
5k views

Can Bitcoin-Qt be configured to trim the blockchain?

I run Bitcoin-Qt and Bitcoin Armory on a laptop. I don't have the space to store the whole 20 GB (or however big it is now) blockchain. I understand the need to run through the entire thing for ...
0
votes
2answers
155 views

Request blockchain for transactions

I have installed bitcoin-qt, so I maintain the blockchain locally. I have a list with transaction hashes strings (i.e f5d8ee39a430901c91a5917b9f2dc19d6d1a0e9cea205b009ca73dd04470b9a6) and I want to ...
4
votes
1answer
6k views

When do you need to run bitcoin-qt -rescan?

I was under the impression that the -rescan flag was no longer needed for some time now. Can someone document precisely, when does one need to run bitcoin-qt -rescan? How has this changed throughout ...
21
votes
3answers
20k 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
vote
1answer
623 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 ...
2
votes
4answers
594 views

Bitcoin-Qt is shutting down my laptop

I am running Bitcoin-Qt, and it is shutting down my laptop while trying to synchronize. I even tried on a different laptop with the same result of shutting itself down. This situation happens while ...

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