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

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Solo mining error

so i have been trying to set up my pc to solo mine for almost a week now. i am using bitcoin core and guiminer v0.10.2. i have gotten to the point where i can start mining, but when i do i get this ...
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1answer
36 views

Bitcoind crashes directly after starting

I'm am trying to solo mine. My first problem is when I try to launch bitcoin client as server with guiminer I get this error Invalid -rpcallowip subnet specifications.* valid are a single ip. I ...
1
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1answer
23 views

Why does Bitcoin-QT not seem to be catching up on my Mac?

I've had Bitcoin-QT running for about six total hours, and the rate at which it's catching up is glacial at best. It takes about an hour to advance a week, which would make the process take about 4 ...
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1answer
21 views

What does Bitcoin Core's “Coin Control Features” do and how do I use it?

What is Bitcoin Core's "Coin Control Features"? How do I use it, and what can I do with it?
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1answer
23 views

won't show my balance by “getbalance myaddress” but show balance by “getbalance”. what is the reason?

i send btc in my-server created btc address. which is created by "getnewaddress". get the payment also and it's shown by "getbalance". but i want to see the balance by "getbalance myaddress". it's ...
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1answer
28 views

What does the label field in Bitcoin-Qt mean?

I tried to get involved with Bitcoin on iPad, couldn't download a wallet and thought a paper wallet was an alternative; I generated said paper wallet and used the address to buy coins. I realized I ...
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0answers
18 views

How to Create Wallet using createmultisig? How do use it? [duplicate]

createmultisig <'["key,"key"]'> what is "nrequired"?? what is "key"?? i use this and create a address: bitcoin-cli createmultisig 2 ...
-3
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1answer
40 views

How can I mine bitcoin faster? [closed]

I'm curios what kind of PC, I need to mine bitcoins. What OS system, what GPU, CPU, etc... my current specification are: CPU: Xeon e3-1230v3 GPU: GTX 780 RAM: 24gb OS: Windows 8.1(64bits) So what ...
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1answer
46 views

Is it possible to get already-sent bitcoins from a corrupted wallet?

I bought some bitcoins on LocalBitcoins then downloaded Bitcoin-qt then instantly sent it to my wallet and now the wallet is corrupted... Is there a way to get them back?
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51 views

How do I synchronize my wallet quicker with bitcoins already sent?

I have my first ever Bitcoin wallet, I instantly sent the bitcoins from blockchain.info to my wallet. Without realizing, my wallet is currently (4pm May 8th 2015) 1 year and 42 weeks behind. Is there ...
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1answer
45 views

Wallet.dat (<0.4.0) format: retrieving Bitcoin, possible security concerns

Whilst moving houses I came across some old HDDs which I've just found contains a wallet.dat from August 2011. The version of Bitcoin-qt must be 0.4.0 as I know the wallet.dat is password encrypted, ...
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1answer
40 views

Bitcoin.conf not being read by Bitcoin Core

My issue is I cannot get RPC working with Bitcoin Core. I do not know what I'm doing wrong! When I first installed Bitcoin Core it did not come with a bitcoin.conf file so I created one with the ...
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4answers
77 views

How to get unspents for a specified bitcoin address?

I want to access unspent data of a specific bitcoin address. I am trying this command bitcoin-cli -regtest listunspent "some bitcoin address" But I am always getting an empty list. I am using local ...
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0answers
44 views

Error While making windows.exe using gitian build?

Actually I'm making a logos windows exe (logosd and logos-qt) following the release process, which is mention on below path on any coin you can find that path, I'm working logos LGS Coin that's why ...
1
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1answer
39 views

How do I open my RPC console?

Someone just asked me to open the RPC console, as part of debugging something else. How do I do that? I'm using Bitcoin-Qt.
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2answers
36 views

Can bitcoin-qt use imported address as a change address?

If I import a private key into a bitcoin-qt wallet, is it possible that some day some transaction I send from the wallet will use its pair address (the bitcoin address created from this private key ) ...
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2answers
85 views

How does “headers first” effect BLKxxxx.dat structure?

Assuming a full node running Bitcoincore v0.10 (with txindex=1), how exactly does the new "headers first" functionality affect the structure of the blockchain data? (Specifically, the blkxxxx.dat ...
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0answers
68 views

How I make a portable version of Bitcoin for Ubuntu?

I want to create a bitcoin wallet executable file in Ubuntu with all its dependencies. So when use that file from some other system it will work perfectly. How I make a portable version of Bitcoin ...
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0answers
67 views

Problem with Berkeley DB while building Bitcoin on Windows from Source Code?

I'm trying to compile Bitcoin from source code in Windows 7. When I run ./configure, I get the following error: checking for Berkeley DB C++ headers... no configure: error: libdb_cxx headers missing ...
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1answer
60 views

How do I create release build of my new bitcoin wallet?

I have created a new alt coin, and now I want to create a executable of my wallet in ubuntu. I don't know how to create a release build wallet with all its dependencies. How I can build my wallet ...
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1answer
67 views

How do I set up bfgminer?

How may I know if I've set up my bfgminer correctly? I don't have any hardwares (cause I'm like pretty broke and it costs a lot) so how may I know if bfgminer is properly working? How do I know if I ...
0
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1answer
57 views

Redeeming OP_SHA256 hash OP_EQUAL (Testnet) Tx

I created the following non-standard Tx on the Testnet3 network: 6b52c981e6814072db77cb755b2633cd126b4ca21501d18ab994531e17a4a813 { hash: ...
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0answers
63 views

What is “Signing transaction failed” error means ? How to resolve and avoid it?

I just tried to send some bitcoins and I received this error , I don't understand what does it mean and why?
5
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1answer
105 views

Ubuntu bitcoin PPA

Since bitcoin is a software package that involves "real" money (inasmuch as any currency is "real"), I know there are major incentives for unscrupulous people to build backdoors into software related ...
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1answer
60 views

How do I copy the blockchain to a separate computer running Bitcoin Core?

I'm running bitcoin-qt 0.8.6 on a different computer that has the whole blockchain downloaded. I tried putting all the blk.dat files and the index from that computer the blocks folder in bitcoin-qt ...
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1answer
98 views

Difference between createmultisig and addmultisigaddress?

What is the functional difference between createmultisig and addmultisigaddress in bitcoincore (v 0.10)? To be clear, I understand how both function. ie. multisigCmd n ["address1 public key as hex", ...
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15 views

Why there is a no way to remove the encryption from bitcoin-qt UI [duplicate]

I encrypted my wallet with a passphrase in bitcoin-qt and I didn't find a way to remove this encryption from the UI , is there any way to do it? I wonder why there is no option for that ?
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2answers
65 views

Bootstrap.dat on Mac OSX 10.9 - Difficulty

Been trawling through a lot of information (I know this similar issue has probably come up a fair bit) on this issue and going round in circles a bit. I am not the most tech savvy individual, and ...
3
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1answer
132 views

Is multisig address belong to the same wallet created by?

I created 2-of-3 multisig address using bitcoinqt by three public keys from my wallet . when I tried to validate this address after creation it shows : "isvalid" : true "ismine" : false should it ...
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1answer
39 views

What does the keypoololdest field mean?

After reading this question I watched the keypoololdest. It was 1392447127 (Sat, 15 Feb 2014 06:52:07 GMT) I created a new address. Then, it was 1392449568 (Sat, 15 Feb 2014 07:32:48 GMT) Should ...
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1answer
81 views

Bitcoin-Qt wallet shows outgoing transaction as “Offline (0 confirmations)”

What is the meaning of a transaction status of "Offline (0 confirmations)" as opposed to "Unconfirmed (0 confirmations)" ? Does it mean that the transaction has not even been sent to the network yet? ...
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2answers
112 views

How to premine our coins in my altcoin?

I want to premine our coin, but I'm not able to understand which function from which file actually generate coin. So if you know than let me know so, I can understand that code and implement my own ...
2
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1answer
54 views

Error: Wallet backup failed! (code -4) when setting up bitcoin-qt for first time

I downloaded and ran bitcoin-qt to play around with. First thing I did was create a wallet passphrase. The second thing I did was try to create a wallet backup. Then I got this message: Error: ...
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64 views

Bitcoin Core shows error message

I have used Bitcoin Core for over 02 months it ran so smooth, but today i open Bitcoin Core and it show error message like this image: Bitcoin Core (OSS GUI client for Bitcoin) has encountered a ...
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0answers
187 views

Fatal error: Uncaught exception 'Exception' with message 'Invalid Response'

Fatal error: Uncaught exception 'Exception' with message 'Invalid Response' in C:\xampp\htdocs\jsonRPCClient.php:155 Stack trace: 0 C:\xampp\htdocs\jsonRPCClient.php(87): ...
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56 views

Bitcoin-QT blockchain: your speed experience with using any HDD connected via USB2.0 with TrueCrypt?

Background (I've never used bitcoin before.) I have Bitcoin-QT 0.9.3 (zip version). bitcoin-qt.exe sits on the internal HDD of my laptop. All of the other stuff (blockchain, wallet,...) on a 128GB ...
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1answer
99 views

Is there a way to reindex from disk but not start from blk0000.dat?

While my Bitcoin-Qt was synchronizing, I ran into the following error: It first loaded full blocks from blk00000.dat to blk00217.dat file (with file size about 131 MB per file). Then Bitcoin-Qt ...
0
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1answer
51 views

How to send user input data(Bitcoin address) from iPhone to server and then send Bitcoin back to user's Bitcoin address?

Background I just got started yesterday learning Python and I'm currently building my first iPhone game. What I'm trying to do is create a Bitcoin Pot Jar inside an iPhone app like ...
7
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1answer
182 views

How many addresses does my wallet.dat contain? Do I need to make a new backup every time I make a transaction?

I'm having little problem here, trying to figure out the safest way to backup my wallet.dat to make sure that no BTC may be lost in case of recovery. I'm not sure how the process of adding new ...
3
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1answer
166 views

What are test_bitcoin.exe and test_bitcoin-qt.exe?

These two binaries appeared in Bitcoin Core a few versions ago, but I don't remember ever seeing an explanation of what they are and what you would use them for.
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2answers
94 views

walletNotify on every Bitcoin Network transaction

Is there any way by which I can receive each and every Bitcoin transaction that takes place on the Bitcoin network(not only my own wallet's transactions)? Just the way Blockchain.info provides a ...
0
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2answers
77 views

How to use bitcoin-python

I'm trying to create a bitcoin address with the bitcoin-python library. I tried this code: import bitcoinrpc bitcoinrpc.connect_to_local().getnewaddress() But I got this error: error: [Errno ...
0
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1answer
38 views

How often should I back up my wallet if I use Bitcoin-Qt client? [duplicate]

I am new to bitcoin and the first client I installed was Bitcoin-Qt (Bitcoin Core v0.9.3.0-gcea5e49-beta). After installing and downloading the blockchain I immediately created a backup file. The ...
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3answers
55 views

Can I generate payment adresses while offline?

So I'm using the original bitcoin client. What if on a computer without internet (A) I generate a bitcoin address and then use this address to receive a payment (by using an other computer with ...
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0answers
69 views

Error trying to compile own coin in windows

I'm trying to compile my own coin in windows. I keep getting this error when running qmake "USE_UPNP=- (MyCoinHere)-qt.pro Project MESSAGE: Building without UPNP support The directory name is ...
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1answer
30 views

Is there a BIPs roadmap somewhere?

Which BIPs are already implemented by bitcoin-core and which are scheduled to be supported by the client in the scheduled releases? I found these questions to be relevant: Where can I find out ...
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2answers
218 views

any way to recover lost qt bitcoin wallet? [duplicate]

Hi is there any way to recover my Bitcoin-Qt wallet with only an address and the wallet password? Unfortunately my disk was formatted.
0
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2answers
46 views

osx - bitcoin-qt v0.8.6 doesn't starts at osx 10.9 non-developer machine

I've compiled a bitcoin-qt v0.8.6 on osx 10.9. It successfully runs on developer machine from 'Finder' (as Bitcoin-Qt.app) and from terminal (as ./Bitcoin-Qt.app/Contents/MacOS/Bitcoin-Qt). I've ...
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2answers
115 views

How to run multiple bitcoin RPC commands through the command window?

Yes, I can generate a new address through the bitcoin-qt command console, but how might I run a for loop to generate 100 different addresses? What kind of file does the bitcoin client take? Can I run ...
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1answer
32 views

Is it possible to get bitcoin-cli without having to build all bitcoin source?

I'd like to use the bitcoin client to examine some of the inner workings of bitcoin-qt (non-invasively, using gets and lists mostly). Is it possible to do this alongside the standard executable? I ...