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

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Maximum number of transactions in wallet.dat for Bitcoin Core

I know that a large number of key pairs in wallet.dat is not a concern. But is having too many transactions in wallet.dat an issue? Can Bitcoin Core start crashing after it reaches a certain number ...
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1answer
23 views

Test in a box duplicating addresses how come?

I copied the whole directory for bitcoin data and then ran two instances one for the first directory and the other for the copied one, and then I generated a new address from the old instance go to ...
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21 views

What is the limitation of the bitcoin core database in a windows machine?

I'm having problems with more than 10000 private keys , I wonder what is the limitation and what is the best practice of number of keys in bitcoin core wallet? is there a limit in database size ?
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2answers
31 views

Importing keys to a brand new wallet

After I imported keys to the brand new wallet I tried to test that it is imported properly so I ran salvagewallet command to verify my new wallet but got these errors! 2014-08-21 12:17:28 WARNING: ...
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1answer
16 views

Assertion Failed Error

Steps Install brand new Windows Server 2012 machine. I installed Bitcoin Qt I loaded my wallet.dat It ran ok for 8 hours. Than it gave an error : "Assertion Failed!" error. ...
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0answers
21 views

Bitcoin Core RPC goes does down

I have issues running Bitcoin core. Steps Install brand new Windows Server 2012 machine. I installed Bitcoin core. It ran ok for 8 hours. RPC server of bitcoin core goes down. When I do CMD> ...
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1answer
35 views

Full node of bitcoin

I would like to have Bitcoin Core running as a full node. I thought it is like plus 100 GB. But on the web site it says it is no more than 20 GB. When I run Bitcoin-Qt is it enough to run full node or ...
0
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2answers
85 views

Where to place Bitcoin bootstrap.dat

I'm sure this has been asked many times before, but I've recently gotten into the whole cryptocurrency thing starting with Dogecoin, and I now want to use Bitcoin as well. I am on Windows 7. I found ...
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0answers
16 views

How do I export a private key from my Bitcoin-QT wallet if the wallet isn't synced?

I started syncing a bitcoin-qt client, and had somebody send me funds to an address generated in the client. I then stupidly decided to speed up the syncing process and downloaded a torrent of ...
4
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1answer
48 views

Three numbers after dash in transaction id

In Bitcoin Core the transaction id is appended with a dash and three numbers. They are usually 000. What do those numbers mean? For example: ...
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2answers
39 views

How is the previous transaction hash calculated?

Can anyone provide a clear example on how to calculate a previous transaction hash. Say i want to create a new transaction, i get that the hash is calculated by doubling sha256 a message m, but I'm ...
3
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1answer
152 views

Is bitcoin-qt using bitcoind? or bitcoind is already built in the bitcoin-qt wallet?

When using bitcoin-qt wallet, all commands are executed externally with bitcoind? I am asking because I saw an altcoin wallet-QT (DMD) which comes as a single file without any daemon file, does it ...
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0answers
29 views

Gitian Build Issue - Windows

Got a little issue when compiling Windows QT using Gitian. BTW Im using a Ubuntu 12.04 64bit VPS. So I am using the instructions here : ...
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1answer
144 views

How to make bootstrap.dat work with bitcoin qt

I have downloaded the bootstrap.dat torrent to make bitcoin qt synchronize faster. I have searched the bitcoin directory by writing in the Run Application "explorer %APPDATA%\Bitcoin" I have dropped ...
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1answer
24 views

Bitcoin-qt transaction not initiated by the wallet owner

I was just mining for some Dogecoins with Eobot and parallel I had BGFminer set on solo mining + 4 pools from eclipse. The issue is that the moment the Eobot kicked in (it started on mining Dogecoins ...
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2answers
45 views

Bitcoin-qt import private key crash

Importing a private using the debug console causes a crash, I always have to kill from shell the bitcoin-qt app and restart it. Is there any way to prevent this? Is there a way to import the private ...
0
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1answer
30 views

When do P2Pool Node Fees get paid?

I have set up a node and been running for a few days now and a couple of payments have gone out form it which is good. These payments are going to a coinbase wallet and there is a local wallet ...
0
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0answers
24 views

How does Core distinguish between confirmed & unconfirmed Tx in memory?

Looking for a low-level answer, links to reference code would be helpful: Is there a difference between a Tx message received from a peer, and a Tx item as included in a valid block received from a ...
0
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1answer
62 views

How can I convert a bitcoin public key to a bitcoin address?

How can I convert a bitcoin public key to a bitcoin address? Note: I am using PHP. Is there an existing bitcoin API or PHP-API to do that converting ?
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1answer
35 views

getrawtransaction doesn't work for every transaction with -txindex=1?

i put txindex=1 in bitcoin config and reindex blockchain after that when i call getrawtransaction for some transactions didn't exist in my wallet and work well like: [Working] getrawtransaction ...
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0answers
39 views

Build Altcoin-qt, keep getting 'This application has request the runtime to terminate it in an unusual way' error

I successfully built my coin on my laptop using Qt4.8.6, but get this error when I try to solo mine it. I can solo mine, but the error pops up. If I click 'ok', it shuts the program down and I can't ...
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0answers
25 views

How can i request balance of bitcoin address from Bitcoin-Abe using PHP?

i installed Bitcoin-Abe. How can i request balance and transactions of specific bitcoin address from Bitcoin-Abe using php ? Is it make by query database or what ? Can someone explain how can i ...
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2answers
75 views

How can i get balance of bitcoin address not exist in my wallet?

How can i get balance of bitcoin address not exist in my wallet ? I try to use bitcoin-Abe but it is complicated and take seral days to full database with blockchain. Is there exists other tools ...
3
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2answers
85 views

Multisig doesn't work unless all keys were generated from the current wallet?

I tried to create a multisig in both the Bitcoin network and the Bitcoin testnet. It seems to work only when all public keys are from the current wallet. That means when I call listunspent after I ...
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0answers
48 views

Building Altcoin, getting undefined reference to CTxDB error

I am trying to build an altcoin under Windows. It has compiled just fine under Linux. I installed all the dependencies, updated my path, and installed Qt for qmake. I am partially following the guide ...
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3answers
52 views

Error compiling altcoin-qt for Windows, getting a GCC internal compiler error

I think I managed to get all my dependencies and libraries right (fingers crossed), but now when trying to build blackcoin-qt, the QTSdk compiler gives me this error while building qtipcserver.o: In ...
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0answers
21 views

GetBlocks Message containing Transaction Hashes

I'm sending a getBlocks Message which returns me an Inv Message containing up to 500 block-hashes as specified in the Protocol Specification. The Specification says: The maxium count for a an ...
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32 views

How do I prevent Bitcoin-qt from having to keep reindexing the blockchain?

Is it likely that anti-malware or anti-virus software is causing this issue? (I have told such programs to exclude the Bitcoin folders from scans)
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1answer
29 views

Priorities in Bitcoin-qt Client

On the bitcoin wiki its says: Transactions need to have a priority above 57,600,000 to avoid the enforced limit (as of client version 0.3.21). This threshold is written in the code as COIN * 144 / ...
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1answer
65 views

Help me work out a transaction fee

I am having difficulty working out how to work out a transaction fee. I've read the theory, but don't understand how to get the values to put the theory to practice. Can someone please help me work ...
0
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1answer
147 views

What is chainwork?

If I run the RPC call getBlock on the bitcoin-qt client it gives me field called chainwork containing a hash. I cant find any information what this value is about. Request: getblock ...
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1answer
41 views

Purpose of a BlockChain in local wallet application

I have installed the BitCoin wallet application on my PC, so that I can cold store my BitCoin. It's "Synchronizing with the network" and has 272 weeks of BC left to download (painfully slow!!) What I ...
2
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1answer
36 views

Where can I get the source code of Bircoin or ANY other cryptocurrency compilable in Visual Studio?

I really want to study the source in detail. I'm using windows so can't compile the source on Github. I found one here : http://bitcoinqtmsvc2012.codeplex.com/, but couldn't get it to compile even ...
3
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1answer
79 views

How can I connect to bitcoin-qt client with public ip address

I used the bitcoin client but i want to connect to it using public ip adress not localhost. From that machine i could reach bitcoin using localhost but when I am using public ip address with the ...
0
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2answers
65 views

How do I switch from MultiBit to Bitcoin-QT?

Okay, so I have seen the questions on how to go from Bitcoin Core to MultiBit, but I want to go the other way. Really, I downloaded and started using the wrong wallet. I wouldn't even mind MultiBit ...
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0answers
38 views

why does listunspent empty?

When i make lisunspent command on Bitcoin RPC console show me empty {}, but i have coins in my wallet. Why listunspent is empty ? and how can make lisunspent contains transactions ? Thanks Editing: ...
4
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2answers
163 views

How to receive payments online to single address per user in scalable way?

Suppose we are building online casino/market and want to receive payments. To be scalable, safe and have good user experience, we: cannot generate new address for every single payment. Having ...
1
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1answer
12 views

Bitcoin wiki docs, account or address?

listtransactions [account] [count=10] [from=0] Returns up to [count] most recent transactions skipping the first [from] transactions for account [account]. If [account] not provided it'll ...
6
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1answer
101 views

How do exchanges decide on cryptocurrency trading pairs?

Cryptocurrency trading pairs for example ltc/btc, doge/btc should be paired using some criteria. I'd like to comprehend on what basis they are paired.
0
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0answers
29 views

Can't get armory to work

When I try running armory, it seems to download the block change and actually gets to 0 blocks, but then all of the sudden, armory disappears. Anyone know why this is happening? In the log file, I ...
0
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2answers
57 views

Using paper based public/private keys in bitcoin-qt [duplicate]

If I only have a public key string and a private key string written on a sheet of paper. How do I use those in bitcoin-qt? If this can be added to bitcoin-qt, will it eventually show me how much ...
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0answers
84 views

creating our own coin - connection refused error

We are trying to create our own currency. We first started with testnet. The aim is to generate a genesis block and testnet did it very well. However, although we had connection between two ...
1
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1answer
87 views

How do you sweep a paper wallet with Bitcoin-Qt?

Sweeping involves importing a private key, then sending it's entire balance to a new address in your wallet via a new transaction. This would protect your paper wallet's bitcoins from being stolen if ...
1
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2answers
27 views

Would Bitcoin-Qt ever use an imported private key's public key as a future change address?

Let's say I import a paper wallet's private key into my Bitcoin-Qt client. I then manually sweep the entire balance from that private key to a different Bitcoin-Qt private key/address with a new ...
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2answers
44 views

Can someone explain double spending to me?

I am restoring a backup of my Bitcoin Core wallet on a new PC. I downloaded the complete bootstrap.dat and placed it in ~/.bitcoin. I thought using the bootstrap would make things faster, but ...
3
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2answers
105 views

Does the Bitcoin Core API support high-precision balance display?

I am currently working with a number of altcoins and and I need to support deposits and withdrawals in currencies with very large coin number cap like Dogecoin. I am wondering whether the Bitcoin Core ...
2
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2answers
387 views

How do I load wallet.dat on new PC and import everything into Electrum?

My primary PC died last month due to what I believe is a motherboard error. My EVGA board displays "FF". The fans, drives, everything powers up as usual. But I don't hear any beep, no POST, no BIOS, ...
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1answer
43 views

BitCoin RPC calls

What is the best method of getting the transaction id for the last payment sent to an address with n confirmations ? getbalance address with minconf will give me a balance but what I would like to do ...
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22 views

Transaction verification process in full nodes

I'm having some trouble understanding the process of transaction verification on full nodes. I understand how a transaction is verified via public cryptography (hashes, signature, etc, as it's ...
0
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2answers
77 views

Unable to establish connection to bitcoin using json and php

I'm newbie to bitcoins. Im trying to get the info, as much as I can. I'm trying to get the information by using getinfo() method that is mention in api documentation. The code i have tried is ...