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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5
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1answer
6k views

Transaction refund address

In the what’s new in Bitcoin Core 0.9.0 notes there is a reference to a refund address. I tried to look it up in the forums and the wikis but I came up with nothing. How can I set a refund address ...
1
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1answer
762 views

Which wallet application lets you send to multiple output addresses with just 1 fee?

Which wallet applications lets you send to multiple addresses from one output? I'm looking to build a physical bitcoin kiosk faucet and was looking to see how I would avoid miner fees if i combined ...
13
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1answer
17k views

How can I create a new wallet on Bitcoin Core?

How can I create a new wallet on Bitcoin Core (Bitcoin QT)? I forgot my old password, so I can't create transactions using the old wallet. I don't have money on my old wallet, I just need to create ...
2
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1answer
503 views

my wallet will not send BTC

I get this error when I try to send BTC A FATAL ERROR OCCURRED. Bitcoin can no longer continue safely and will quit. Exception: St13runtime_error CDB(): can’t open database file wallet.dat, error -...
2
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1answer
137 views

Is change of Bitcoin address of an account possible?

I have multiple Bitcoin addresses in my Bitcoin Daemon, Which address will be used for receive transaction Can i change my default account address(mentioned in 1) to new one
8
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2answers
307 views

Transaction fees after 0.9 protocol update

As the changelog of bitcoind 0.9 tells, transaction fees should be greatly reduced. What are the implications of this? How were transaction fees determined before the change and after the change? How ...
2
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0answers
688 views

Ws2tcpip.h and winsock2.h on Window QT Wallet

Been trying for the past few days but couldn't get it working, I already download the latest cryptopp library but its seems that maxcoin got some issue compiling If I qmake "USE_UPNP=-" maxcoin-qt....
4
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1answer
3k views

Delete all wallet addresses

How can I delete all addresses from my Qt wallet without having to download the blockchain all over again from the scratch? I would like to find a bulk way to do it as there are a few thousand ...
1
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2answers
283 views

Bitcoin URGENTLY Need Blocks Files - Download them from some Website [duplicate]

I have been doing this synchronization procedure (first time) in bitcoin-qt for over 85 hours and it only came to 31 Weeks Behind. Withdrawed from localbitcoins like 95 hours ago and obviously this ...
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2answers
76 views

Can anyone without knowledge of encrypted tech use bitcoin?

I am interested in registering online, however I haven't got any knowledge on encrypted language not even on software design or whatever it is called. Is it possible for a person like me to register ...
0
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1answer
451 views

Programming for/modding bitcoin-qt on Windows

In multiple places I've found methods of modifying or adding to the bitcoin-qt(or other coin wallet) source on ubuntu or osx, but how would I do this on a Windows machine? If possible, I'd like to be ...
0
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1answer
93 views

Bonus for my friend [closed]

I have used original bitcoin client for first time. When I opened it showed the account balance is 1,000.0. Why is this bonus of 1 btc? Now my friend tried opening client but his account balance is 0....
2
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2answers
976 views

Bitcoin-qt data on external drive

I have done the instructions listed here: How to move Bitcoin data from Application Support on an external drive [Mac] It works fine for a flash drive connected the mac, but I wanted to have the data ...
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2answers
294 views

How to start mining Bitcoin [duplicate]

I have a strong GPU, CPU, and enough RAM to choke a goat. I have installed BitCoin Core 64, and my wallet is (finally) synced. What do I do to start mining. Do I just leave the program running or do I ...
1
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1answer
240 views

Why bitcoind/bitcoin-qt is imposing transaction fee?

bitcoind is imposing a transaction fee of 0.0001 BTC forcefully even though I have set "transaction fee" to 0. Is it possible to transfer BTC to an address without paying a fee? If so, how?
4
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3answers
491 views

Is Bitcoin core V.0.9 not updated on PPA ppa:bitcoin/bitcoin?

Version 0.9 of Bitcoin-Qt just came out. When will ppa:bitcoin/bitcoin be updated? In the meanwhile, any steps showing how to upgrade are welcome!
1
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0answers
118 views

Submitted blocks get rejected on Litecoin testnet

I'm trying to submit blocks to the Litecoin Testnet, however everything gets rejected. I got my raw value as ...
6
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2answers
591 views

Bitcoind Performance for production usage

Lets say we have one instance of bitcoind running on the production server. And our exchange software/application interacts with it using RPC callbacks for: address generation withdrawal ...
1
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1answer
293 views

Cannot allocate memory

EXCEPTION: 11DbException Db::get: Cannot allocate memory bitcoin in ProcessMessage() Downloaded 250k blocks, now it won't run anymore i'm running ubuntu 12.04, I have 20GB HD and 1gb ram. any way to ...
6
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2answers
2k views

Is it possible to send coins WITHOUT importing private key?

I have a cold storage wallet that I periodically move funds into. I want to be able to send funds out of the wallet quickly. Right now, I have to keep a clean VM up with the full blockchain, then ...
0
votes
1answer
570 views

Qt client not exiting on Linux

I am running Ubuntu 12.04. When I close bitcoin-qt (or any of its derivatives, like litecoin-qt or dogecoin-qt), sometimes it does not completely exit. I then have to run killall -9 bitcoin-qt, or ...
1
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0answers
112 views

Number of transactions and transaction history don't match in XenCoinQt [closed]

I am solo mining XenCoin using XenCoin QT v0.6.3.3-g069d718-beta. The number of transactions shown on the overview tab is 9, yet there are 7 transactions listed in the transaction history. Also, ...
1
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1answer
126 views

Possible to use BlockChain.info and Bitcoin-QT synced?

I've used both BlockChain.info and Bitcoin-QT. Is it possible to use the same addresses on both? I don't have a incredibly large amount of bitcoins, so I'm not worried about it getting hacked into, ...
3
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1answer
2k views

Sent bitcoin with no fee, waited and bitcoins disappeared

I sent about $425 to an adress from my bitcoin-qt wallet and forgot to include a fee. So I googled and googled and waited around for 4 or 5 days for it to stop broadcasting but I get on my computer ...
1
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3answers
4k views

How can I send bitcoin from one address to another through the Bitcoin client/API?

How can I send bitcoin from one address to another via Bitcoin client/API ? There exist an API call called: sendfrom <fromaccount> <tobitcoinaddress> <amount> [minconf=1] [...
0
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1answer
401 views

cannot connect via 8333 port on website

MY bitcoind is on: http://207.12.89.181/ yet I cannot connect via any port, I've tried 8333 and 8332 any reason why? it's a ubuntu server. Im using that server to connect to from another server.
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0answers
211 views

how to run bitcoind server on a ubuntu 13.04 server

I am trying to host a bitcoind on my server so I can connect to it on my website, how do I install it, run it, update the conf file? this is on a server not a desktop
0
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2answers
641 views

Cannot connect to bitcoin-qt server

# server=1 tells Bitcoin-QT to accept JSON-RPC commands. server=1 # You must set rpcuser and rpcpassword to secure the JSON-RPC api rpcuser=bhhtufhrt rpcpassword=ferhrhh im trying to connect to ...
4
votes
1answer
448 views

What are the weakest cryptographic guarantees in Bitcoin?

I read in this Github pull that Bitcoin relies on weaker cryptographic guarantees than SHA256. What are the weaker cryptographic guarantees being referred to? Could it be that RipeMD is 160 bits? ......
3
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1answer
460 views

How does the satoshi client handle endianness?

I'm looking through the source code of the satoshi client, particularly into how transactions are serialized and sent through the network or stored to the disk. The CTransaction class has this block: ...
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0answers
100 views

Bitcoin Qt message signature construction

I'm trying to construct the message verification signature of bitcoin qt in python. I'm able to compute the couple (r,s) of the signature, but, even I'm not able to find the correct way to encode it ...
0
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1answer
148 views

Anyone able to run Bitcoin-Qt 0.8.6 on Mac OSX 10.9.2?

I ran the Mavericks update today, putting me at 10.9.2 and now my Bitcoin-Qt stops responding after it notifies me that it is "verifying blocks". I am using it for ongoing research and am in a bad ...
6
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1answer
705 views

How is the transaction malleability issue being fixed?

With the upcoming release of Bitcoin Core 0.9, I am wondering how the transaction malleability issue is being fixed and what are the consequences of the fix? It appears that transaction malleability ...
3
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3answers
1k views

Stuck duplicate transaction in BitcoinQT

I received two payments with the following transaction: https://blockchain.info/tx/12e487de6fd8d920446cd8663dc11977d185ceaa25b7c6f36921fb76e58875f0 On this transaction ...
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1answer
150 views

Compiled and modified source wont work with server=1 [duplicate]

I just compiled dogecoin-qt using the original source, and edited it to generate new genesis block, because i want to create new coin for educational purpose. It is working just fine, and without an ...
1
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2answers
355 views

How can I create 50,000+ bitcoin addresses in my wallet?

How can I create 50,000+ bitcoin addresses in my wallet? I will need more than 50,000+ addresses in my main wallet. I use Bitcoin Armory, Bitcoin-Qt and I'm just trying out Blockchain.info. Is it ...
1
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0answers
84 views

Installed Bitcoin-QT on windows2008r2 server, but it won't snyc anything at all

Installed Bitcoin-QT on windows2008r2 server, but it won't sync anything at all. No connections to network, no blocks, no movement full stop. I have OK'd it in windows firewall, tried connecting ...
1
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1answer
4k views

how to transfer coin using bitcoin rest API

I've been googling for quite some time now, but I was unable to locate any complete example, with the request & the POST/GET parameters to the Bitcoin JSON-RPC. How to use the JSON-RPC ? How to ...
0
votes
1answer
411 views

Android Bitcoin Wallet, zero balance after keys import

I imported all my private keys (including those of change addresses) to Andreas Schildbach's Bitcoin Wallet from bitcoin-qt and my balance is still zero. This disagrees with Blockchain, which clearly ...
0
votes
1answer
1k views

I want to use another wallet.dat file with bitcoin-qt. Is this possible?

my situation is the following: I have a laptop with not much space on disk and therefore using bitcoin on a stick (I start bitcoin-qt with the argument "-datadir=location/to/stick). Now I wanted to ...
0
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1answer
1k views

Can anyone explain the differences in behavior of getrawtransaction and gettransaction in RPC?

I right clicked the transaction history in the QT client and pasted in the TxID below. Q1 In the following test, can anyone explain what the purpose of the suffix -000 is and what it's used for? ...
1
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2answers
608 views

Do I need to wait for blockchain to complete to use private key elsewhere?

As the title says: My blockchain sync still needs to sync 56 weeks, but I want to export my private keys from the bitcoin qt wallet to blockchain.info. Is it possible to do that without waiting for ...
7
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1answer
2k views

Why does Github say that the Bitcoin project is 74% TypeScript?

For the Bitcoin project on Github clicking "Show language statistics" shows that the source code is almost 74% TypeScript. Why is this so when ostensibly Bitcoin is written almost entirely in C++. ...
3
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2answers
187 views

Is transaction malleability an issue when receiving payments?

Assume I'm using the original client to receive payments. Is the following scenario possible? My wallet gets notified of unconfirmed transaction with id 12 in which one of the outputs is an address ...
3
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2answers
188 views

is transaction malleability a threat to my local wallet?

I have a local Bitcoin-QT wallet. Can transaction malleability be used to steal my horde of tens of thousands of Satoshis?
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?
4
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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
votes
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.

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