Bitcoin Core is an MIT-licenced Qt 4 GUI application for the original Bitcoin codebase. Additional/previous names include "Bitcoin-Qt", "Satoshi-Client", and "Standard Client".

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Bitcoin core 64 bit has freezed

I downloaded bitcoin core 64 bit and it was synchronizing. I turn my laptop off and open the program again and now it frozen at " loading block index " . I have bitcoins on it. What should I do now ?
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15 views

Meta-Mining: Can mining exist in abstract states?

Has anyone here explored or pondered possibilities for meta-mining? Theoretically, you could have miners work on any computational problem, and then have rewards handed out proportionally as part of ...
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19 views

Bitcoind writes complete wallet.dat regularly which is a problem, what can i do?

i have troubles with my system, using iotop i identified bitcoind as the source of problems. I am running bitcoind of bitcoin-0.10.0-linux32 and am using the RPC calls of bitcoind. My wallet file is ...
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1answer
27 views

my bitcoin core software isn't opening.

I downloaded bitcoin core (64 bit) and I am still waiting for it to synchronized. But just now, If I open the software it loads from 1% to 100% and then a note appears with the inscription " cannot ...
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1answer
19 views

bitcoin core 0.10.1 upgrade stuck syncing

I just upgraded from Bitcoin Core 0.9 to 0.10.1 on Ubuntu 14.4 after being gone for a few months (blockchain data is from February). When I loaded up bitcoin-qt, it seemed to be working fine and ...
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18 views

how do I send my imported wallet on electrum

I have been able to transfer my bitcoin to electrum but am facing hard time to pay it or send my coins. A form appear and I fill out and there is only two option to choose to click create unsigned ...
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20 views

It has took so long and my bitcoin core (64 bit) is still not synchronized [duplicate]

I am using bitcoin core (64 bit) wallet. I have funds on it and I have open it for almost 3 hours and it is still not synchronized. I have check the date and also my 4G internet runs fast but still ...
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1answer
36 views

How much disk space do I need to run Bitcoin Core with txindex on?

Currently the blockchain is at 36 GB, but with txindex turn on, how big is it? And how much disk space should I get to run a Bitcoin Core node with txindex on for say a year?
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24 views

Mempool tracking

I'm trying to clear up some uncertainties around the mempool A tx comes in, its validated, and no other transactions have currently marked any of its inputs. Tx gets added to mempool. If a double ...
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2answers
134 views

Should I be running Bitcoin Core or Bitcoin-XT?

I just read about Bitcoin Core and Bitcoin-XT, and I want to know what is the difference between Bitcoin Core and Bitcoin-XT? And which is better Bitcoin Core or Bitcoin-XT?
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1answer
86 views

Dynamic coinbase as incentive to fill blocks

Miners do not currently have a monetary incentive to fill up blocks with transactions (tx fees are negligible compared to the coinbase tx). Those miners that do fill up the blocks may do so with the ...
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1answer
24 views

How to check Bitcoin payments received or not

I am creating a software and i want to take anonymous payments through bitcoins and once the payment is received to my bitcoin address then the user get serial key of that software... so How i can ...
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1answer
285 views

How do I migrate to Bitcoin XT from Bitcoin Core?

Some people are saying Bitcoin XT is faster and more secure, but I don't know how to migrate from Bitcoin Core to Bitcoin XT, because I have all my coins on Bitcoin Core. What are the steps I need to ...
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32 views

Bitcoin Core not working

I have downloaded bitcoin core, as it was recommended by the bitcoin site. It seems as though it simply doesn't work. I've waited more than 48 hours for it to download the block and it just isn't ...
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1answer
15 views

Reduce Wallet Sync Time

So I am new to Bitcoin and I run the Bitcoin Core on my computer. I know that you need to wait for your wallet to sync before you can make transactions, but it says it won't finish syncing for 4 ...
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0answers
8 views

How do I transfer my wallet from bitcoin qt to electrum without downloading the whole blockchain? [duplicate]

I made a big mistake: I downloaded the bitcoin qt wallet without downloading the blockchain, but I generated an address to send bitcoins to this wallet. And the blockchain says that I received some. ...
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1answer
23 views

If port 8333 is closed, will a node relay transactions to its peers?

During a recent discussion, it was asserted that a node running Bitcoin Core behind a firewall with port 8333 closed would still relay blocks/transactions to peers. Unsolicited connections would be ...
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1answer
32 views

Estimatefee value not corresponding to actual fee

When I call estimatefee 1 in testnet it returns: 0.00044444 Then when I call sendtoaddress xxxxxx 0,1 (which got the first confirmation within a couple of minutes after sending) I see that the fee ...
2
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1answer
36 views

Running another instance of bitcoin-qt dedicated to testnet/regtest?

Is it possible to run another instance of bitcoin-qt dedicated to testnet/regtest? If so, how do i do this? My question is similar to "Running two bitcoind instances for different nets," but I want ...
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19 views

Bitcoind get unique newaddress

Hello all i dont know why but always getnewaddress give me many time the same address I use JSON RPC $server->getnewaddress() and i have encrypt wallet What is the good solution for get unique ...
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1answer
32 views

Bootstrap.dat incorrect or no genesis block found

Hi all i need to add bootstrap.dat after downloading i start bitcoind with -loadblock but not work i have error Incorrect or no genesis block found. Wrong datadir for network? I start bitcoin with ...
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1answer
20 views

Fixing libtool for -rpath problems

I am trying compile bitcoin on Debian 7 Wheezy (64bit) but I am encountering the error Fixing libtool for -rpath problems. I installed all dependencies sudo apt-get install build-essential libtool ...
5
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2answers
114 views

Who makes the decision about blocksize?

I have been running a full node for little less than a year and I am following the discussion around blocksize increase. I am for it. Who actually can make a decision whether the blocksize increase ...
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2answers
37 views

Naming Convention In Bitcoin Source Code

Is there specific reference for naming conventions in Bitcoin Core source code? I see regularity in class naming with prefix "C" (Chain, CInv etc.) or pointer naming with "p" (pprev, pnode etc. ) and ...
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2answers
62 views

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
58 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 ...
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1answer
36 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
47 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
35 views

how to execute Ubuntu shell for bitcoind command in php?

i want to build a bitcoin third party server for my client. but problem is that when i execute "bitcoin-cli" command using php then it didn't give any result. i used JSONRPCClient. but i didn't find ...
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1answer
27 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
32 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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1answer
56 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
54 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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73 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 ...
1
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1answer
62 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, ...
0
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1answer
65 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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1answer
41 views

Transaction too large error

I have over 1400 small transactions in my wallet that add up to a little over 0.2 BTC. I am trying to send them, but keep getting a transaction too large error. I have tried to set a custom ...
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4answers
91 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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56 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 ...
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23 views

listsinceblock returning block on fork

Im considering using listinceblock to monitor incoming bitcoins to my app. What happens if the block returned by listsinceblock ends up being on a dead-end fork?
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1answer
50 views

Multisig addresses with keys from different wallets

I am learning how to handle multisig. First I created a 2-3 multisig address with all keys from my test wallet (bitcoind on server) and sent money to the new multisig address from another wallet. The ...
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1answer
45 views

sendtoaddress questions

Does sendtoaddress automatically collect as many unspent outputs as needed? Is there any way to specify the from address? How is the fee computed? I just tested with two transactions: a) 0.0001 xbt, ...
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1answer
49 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
37 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
98 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
72 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
88 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
67 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
75 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 ...
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1answer
86 views

Redeeming OP_SHA256 hash OP_EQUAL (Testnet) Tx

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