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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how to configure bitcoin-core (bitcoin-qt) to not use change addresses?

Can bitcoin-core wallet be configured to not use change addresses, but just one address? If yes, how? Thanks (PS: I know most people will try to convince me that this is not a good thing, but I have ...
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Why are some transactions unavailable in my debug window?

I got a block and asked for the data in its first transaction and that generated an error. The following is from the console tab in the Debug window: 10:52:52 getblock ...
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19 views

How to enable replace-by-fee via command-line in bitcoin-core?

Alright, so I'm convinced replace-by-fee is a good thing. I've read it's opt-in, so how can I enable it in my bitcoin-core wallet? I don't find any flag to pass it when launching it. I want all my ...
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Antrouter not hashing.

So I got my antrouter the other day. I set it up with my bitman account. When I go to antpool a new tab shows up called antrouter. I thought I had done everything right. However when I check on my ...
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22 views

How to connect to a remote Bitcoin Core remotely

If I have 24/7 running bitcoind on a headless server, is there a graphical way to connect, maybe only temporarily to the server's Bitcoin Core daemon or its client to see if everything is going ...
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35 views

List transactions *relayed* by my full node?

Running Bitcoin Core full node 24x7, with 70+ peer connections. Is there a bitcoin-cli command that will let me see the transactions that my full node has relayed from its SPV "clients"? FWIW, I can ...
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28 views

Need help to understand where bitcoin transaction has gone

I am new with bitcoin and I need some help from experienced members. I have a server with bitcoin core where we accept some payments and use bitcoin core as mercant. The problem is that we have got ...
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8 views

Relationship between SIGHASH types and sequence numbers

The is a specific test case inside of tx_valid.json inside of bitcoin core that I am having issues with for my library bitcoin-s. ["Same as above, but we change the sequence number of the first ...
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44 views

Allowing Incoming Connection on Bitcoin Core

Good Evening, I recently installed Bitcoin Core v0.12.1 on my home server (running Windows 7) and wanted to allow it to accept incoming connections and used the guide found here: ...
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1answer
31 views

How to apply RBF (Replace-by-Fee)

I got a stuck transaction and would like to clear this. I found many information about RBF (Replace-by-Fee) how it works etc. So i think this might be the best option to get my transaction going. ...
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1answer
30 views

Height mismatch between bitcoin-qt and bitcoin explorers

I am running bitcoin-qt on the testnet. The count of the last block is 787794 which is way ahead of what I see on blockchain explorers such as https://test.webbtc.com/, which shows the last block as ...
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66 views

Testnet wallet fully sync block height different to testnet blockchain explorer

I run bitcoin core into testnet mode for learning/testing purpose. My client/wallet/node are fully sync, based on the "check mark" at the bottom right of the GUI-client. Via getinfo command I obtain : ...
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84 views

bitcoins unconfirmed for 7 days :(

Can anyone help me? I am a noob with bitcoin (using bitcoin core client) and I ticked the check box that said something like "send with 0 fee when possible". My transaction has been stuck in the ...
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28 views

how base point of bitcoin public key x , y formed

n = FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364140 p = FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE FFFFFC2F base point of bitcoin public key x , y Gx = ...
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17 views

How do I get the bat file into bfg miner if it was installed into root?

and does this file look correct? g:\bfgminer\bfgminer -o http://localhost:8332 -u xxxxxx -p xxxxxxx --coinbase-addr publicbitcoinadressofpayment --coinbase-sig "bro, that's my block !" ...
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45 views

Error when trying to use OP_CHECKSEQUENCEVERIFY from bip112 on testnet

When I try to spend an utxo sent to a pay to script hash, with the script 5 OP_CHECKSEQUENCEVERIFY OP_DROP OP_PUBKEY OP_CHECKSIG I get the following error. Any help would be greatly appreciated. $ ...
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21 views

Set a single trusted peer in Electrum bitcoin wallet

I've running an instance of bitcoin core on my server. with the "Bitcoin Wallet" Android app it is possible to set this server as trusted peer. The wallet only connects to this bitcoin-peer. Is it ...
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22 views

Where does bitcoin-qt store it's initial settings

I installed bitcoin-qt (v 0.12.1) on Kubuntu 15.10. When starting it the first time the GUI asked me for the datadir. I set it to an external disk. Where are this settings stored? There is no ...
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bitcoin core transaction stuck at 0 Confirmations [duplicate]

So i just started using bitcoins like a week ago , sent out my first transactions and it's been like this for over 12 hours now , ...
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61 views

Bitcoin-qt console on cmd

Is there a way to interact with Bitcoin-qt from Windows cmd and run commands like if I'm running them from Bitcoin-qt console?
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48 views

How do i get info from Bitcoin QT 0.7 to Bitcoin QT 0.11?

I'm having trouble with Bitcoin QT 0.11 not automatically extracting address info from my Bitcoin QT 0.7. When I try to open my Bitcoin QT wallet it comes up with an error code saying it is to unsafe ...
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1answer
65 views

What can I do with Bitcoin Core to see my current balance?

I've waited 4 days now for Bitcoin Core v0.12.0 to synchronise the network and its getting really frustrating, especially when I still have 2 years and 38 weeks worth of the blockchain to download. ...
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1answer
47 views

How do I relocate my bitcoin data in bitcoin-qt to save space?

I am a rather new Bitcoin user, running bitcoin-qt on Linux. However, due to limited disk space, the application is taking up too much of my drive. I'm guessing this is due to the ever-expanding ...
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Is there any way to contact the makers of bitcoin qt and bitcoin core?

Would like to talk to the makers of bitcoin qt and bitcoin core. I have googled but cant find an email address or a way of contact!
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115 views

How do i retreive my bitcoins that I purchased but never receaved because of the dodgie bitcoin qt years ago?

Hi guys I am seeking to retrieve my bitcoins I purchased years ago but my bitcoin qt never synced to receive them! I have now downloaded bitcoin core and I was advised that once I have done that it ...
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1answer
43 views

How to copy wallet.dat from v0.10.2.0 to v0.11.0.

I am trying to import the balance from the older version to the newer one. I deleted the wallet.dat from the newer one and copied the older one into its place. However, the wallet will not start with ...
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1answer
96 views

Bitcoins lost in Bitcoin Core?

I sent a small amount of bitcoins to my bitcoin core account when I was messing around learning to use bitcoins several years ago. I am trying to access these coins but I never got along to utilizing ...
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1answer
61 views

Where is data folder for Bitcoin Core in Windows 7? [duplicate]

I cannot find any wallet.dat file on my c: drive. Any ideas where it can be put? Everybody says the same and I'm doing it. Maybe I'm kind of idiot so I'm pasting screens with steps I have done: 1 ...
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42 views

Where is wallet.dat file?

I have clearly installed Windows 7 and Bitcoin Core. There is no Bitcoin folder in {User}/AppData/Roaming... Blockchain is dowloading but I cannot find where it is and wallet.dat also. Anybody help? ...
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60 views

How can I fix corrupted encrypted wallet.dat?

My only one backup of encrypted wallet is corrupted (last time when backed it up i probably didn't shutdown bitcoin-qt), with hex editor i found in it: mkey ckey (117 that looks fine) Does this ...
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1answer
58 views

BitCoin Core Error Message: “Assertion failed!”

I am experiencing a recurring problem with my BitCoin Core wallet. The main issue here is that I get an error message every so often as the program is updating the transaction blocks. Please see the ...
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1answer
143 views

What is an “insecure transaction type”, as mentioned by Bitcoin Wallet for Android?

I am running Bitcoin Core v0.11.0.0-gd26f951 (64-bit) at home on Ubuntu, and have installed the Bitcoin Wallet for Android on my phone. I sent two transactions from home to my phone: First, Second. ...
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How can I use Bitcoind on Ubuntu if I installed from PPA?

I have two transactions that won't go through. The first one I I sent with a zero transaction fee by accident and the second one I I sent with a fee of .00022324. Neither is going through. I read ...
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1answer
171 views

Where are my bitcoins - unconfirmed transactions

Using Bitcoin Core wallet, I sent coins to an address of mine outside of the wallet. All three transactions sit as unconfirmed though show in blockchain. ...
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Bitcoin,what is this subject about? [duplicate]

Ok I'm completely naive on this subject of Bitcoins,so wish to find out in the most comprehensive way what it's all about.thank you
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1answer
50 views

Is Bitcoin Classic binary-compatible with Bitcoin Core?

I have three full-nodes running Core 0.12.0 that I'm considering moving over to Classic. Am I right in thinking that Classic is binary-compatible with an existing blockchain download? Would I be ...
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1answer
79 views

Hacking Question: Hiring a developer to run bitcoin core to process bitcoin payments on site

Hacking Question: First of all i am totally noob. I dont know much about bitcoins. I have an ecommerce website. I want to accept bitcoin payments for my products. I dont want to use 3rd party api's. I ...
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1answer
46 views

Manually banning nodes through CLI

I cant find this info: How can I ban through CLI a peer connected to my full node? I like how can I do it in the 0.12.0 GUI just with right-click and choosing for how much time I want to ban the ...
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1answer
63 views

Does anyone know how to enable “Massively Reduced Disk Usage for Wallets” feature in Bitcoin Core 0.12.0? [duplicate]

Based on the release note https://bitcoincore.org/en/2016/02/23/release-0.12.0/. Users will be able to run a full node while only storing around 2GB of data. What should I do to enable this feature ...
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1answer
55 views

Connection refused from external server

Here is my bitcoin.conf server=1 rpcuser=root rpcpassword=passwordhere rpcconnect=75.74.28.1.2 (last 2 digits randomized for security). rpcport=8332 rpcallowip=107.180.44.217 So whats the issue? ...
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1answer
96 views

Why would increasing the Bitcoin block size lead to a more centralised system?

Why does Bitcoin Core contributor Peter Todd think that increasing the Bitcoin block size would lead to a more centralised system? “The system doesn’t scale, and you just have to accept that and do ...
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27 views

AddPortMapping fails with error 904

Without additional words, here's logs: ************************ EXCEPTION: NSt8ios_base7failureE CAutoFile::write: write failed bitcoin in ProcessMessages() 2016-03-05 00:15:31 ...
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2answers
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Migrating from Electrum => Bitcoin core

Seems that many people become scared as soon as they seen 1 week or over and discover they've to download the full blockchain(ca. 60 GB now required), so it's full of question about migrating from ...
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1answer
53 views

Making Bitcoin Core 0.12.0 maximize by bandwidth

Bitcoin Core 0.12.0 added many bandwidth (e.g., maxuploadtarget) and rate limiting (e.g., with maxmempool) features. I have maxuploadtarget set to 0 (default; unlimited), yet I used to get several ...
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1answer
81 views

-bash: bitcoin-cli: command not found

I have a Qt testnet3 node synched and running on my mac. In the terminal, when simply trying: $ bitcoin-cli getinfo or $ ./bitcoin-cli getinfo I get: -bash: bitcoin-cli: command not found ...
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1answer
100 views

Why did Bitcoin Core wallet send my coins to this address?

Yesterday evening I installed the Bitcoin Core wallet (v0.11.2 (64-bit) from the Chocolatey repo to my Windows 10 machine). I had some coins in an old wallet.dat that I copied to the data directory. ...
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91 views

Is the 21 Bitcoin computer using Core or Classic?

The 21 Bitcoin computer is using Core, right? I can't find any information that says otherwise. Can someone please confirm this for me though?
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70 views

Bitcoin Core initialization taking forever

Today is the third day, when I'm waiting for Bitcoin Core win-x64 application will sync/initialize. How long should I wait more?
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94 views

How to use Bitcoin Core's submitblock method

I'm trying to understand how mining works. For learning purpose I'm using Bitcoin Core as solo mining pool. Getblocktemplate will return data that is enough to start mining witch is simple founding ...
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596 views

Should I buy my Bitcoins now before a 2016 fork happens with Classic vs Core?

Having read about the the fight of Core vs Classic and the potential of a fork happening. I have a few questions concerning what would happen when a fork happens. I feel its inevitable a fork will ...