Questions tagged [client]

This tag should be used for questions regarding Bitcoin clients. A client is any application which allows a user to connect to the Bitcoin (or alternate) network. Alternately, "client" may refer to a non-standard user interface which interacts with the Bitcoin network through a standard client.

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19 views

Getting Started with a Hello World Node.js App making an API call to bitcoin.org

I have been reading around trying to find where/how you can attach a SHA256 or MD5 hash (i.e. a small chunk of data) to a Bitcoin transaction, which led to OP_RETURN, but I have yet to see exactly how ...
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Bitcoin backend integration - Do I really need the notion of “a wallet”?

I am developing an application that will accept Bitcoins targetting some specific "items" in my application, and later transfert some of those Bitcoins to externals addresses. In many similar ...
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47 views

How to programmatically send Bitcoins without requiring a local copy of the blockchain?

I'm quite new to Bitcoin development! I've seen the documentation about RPC commands, available when you have a local copy of the blockchain. But I'd like to know if it's possible to create and ...
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30 views

Running multiple bitcoin instances on same server system

I wish to run multiple instances of bitcoind on my server to support highly read intensive RPC applications. Following links: how to run multiple bitcoind node on one server? Running Multiple Full ...
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TimeoutError: [WinError 10060] when trying to connect to bitcoin rpc from a pc on the same local area network

I have a laptop with win10 installed. It is now running a full bitcoin node perfectly. I am already able to make rpc requests from the laptop using python and get valid responses. The laptop is ...
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34 views

Bitcoin core causing reboot

I have been having an issue with bitcoin core lately. It has been causing my computer to randomly reboot about every hour or so. I was on version 17.1 but upgraded to 18.0 hoping that would fix the ...
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162 views

What is the oldest Bitcoin Core Client that can in theory sync to the chain tip?

I've seen this question regarding the original Satoshi Client being able to sync to the chain tip. The main issues why it doesn't work were: Change in protocol messages IRC Node discovery is now ...
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1answer
19 views

Bitcoin network resources requirement

Supposing we are alone, could it be possible to run the whole bitcoin network and full capacity of it (maximum transaction per second by different peer) on a low end computer, and how can someone ...
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How to segregate wallet from bitcoin core | Run multiple wallets in different servers on one centralized bitcoin node

I am running bitcoin full node in a centralized server. I have many web applications running in various places. I want to connect this web applications with centralized full bitcoin node. How to ...
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Bitcoin SPV not able to fetch transactions

I am developing a Bitcoin wallet SPV and using 3rd party SDK for the same. However, I tried to create wallet and it gets successfully created and I can also restore those wallets but amount and ...
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108 views

Why is 550 (MiB) chosen for minimum storage size for prune mode?

As you know Bitcoind can run in pruned mode, thus not advertising blocks to other nodes. Even though it has some drawbacks, saving you storage space isn't a benefit you can ignore. My question is ...
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124 views

How do I export an xpub from Bitcoin Core for use in BTCPayServer?

I'm using Bitcoin Core 0.17, and using bitcoin-cli getaddressinfo method to extract xpub for a given address. This xpub is 66 characters long, and I'm using BTCPayServer which needs this xpub and I'...
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42 views

Send or receive bitcoins with bitcoin-cli without downloading full blockchain

I have successfully downloaded, compiled and installed bitcoin-cli from github. I can send or receive bitcoins with sendtoaddress and getnewaddress methods. It works great and i am happy to do that ...
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48 views

Why doesn't the Bitcoin-qt client ask for the Wallet passphrase upon startup?

I've just encrypted my wallet.dat file using the "Settings -> Encrypt Wallet" menu option. I then closed the client and re-opened it. I was expecting to be prompted to put in the wallet password ...
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find bitcoin wallet owner [duplicate]

I received a black mail threat that a hacker would post all account access information of my accounts (bank & email information) online and on all social networking sites if I didn't pay $5,000 of ...
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73 views

Coin selection algorithm

Playing around with Bitcoin Core Client v0.18.0, I used this command: $ bitcoin-cli sendtoaddress "mozazucvLK179u41bF5Vd2Agp4wsm7HsPo" 0.1 which created this transaction. I noticed that the ...
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117 views

Bitcoin 0.18: how to send bitcoin from one address to another using Bitcoind?

To transfer bitcoin from one account to another address, we have used sendfrom method and which got deprecated in the latest version Bitcoin 0.18.0 Bitcoin sendfrom method On reading the document of ...
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1answer
60 views

Strange re-connection problem with python-bitcoinrpc

I am using https://github.com/jgarzik/python-bitcoinrpc to access the bitcoin core rpc. I have found a very strange re-connection problem. from bitcoinrpc.authproxy import AuthServiceProxy, ...
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1answer
15 views

How do I broadcast an “alert” message to the network

I am curious about how to broadcast an alert. I know that this is possible because the system to send alerts has been shut down and this probably won't work, but I am curious about how I can ...
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32 views

Make a metadata transaction without transferring bitcoins

Is it possible to make a metadata-only transaction without transferring bitcoins? (I know you should always pay a fee, but is it essential to transfer bitcoins in a transaction?) Thanks and regards!
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57 views

How does one mine a fraction of a bitcoin?

I'm new to the whole bitcoin stuff. The stuff I've read about mining so far told me that when a node in blockchain finally finds the correct nonce for a block that can be accepted in blockchain, it ...
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1answer
147 views

What does it mean if TXID and WTXID are the same?

I'm having a tough time understanding what exactly WTXID is and what it means when WTXID and TXID are the same (and vica versa). What I understand is that WTXID includes the witness data. Since non-...
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973 views

Is there a reason to why Bitcoin Core does not implement BIP39?

Is there a specific reason to why BIP39 isn't added to Bitcoin Core? Seems very trivial to add and am confused to why it isn't there.
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160 views

Litecoin : Error ECONNRESET while trying to connect with NodeJS

I am getting started with Litecoin so please bear with my question. So I have a local litecoin node running in my local system. So I am planning to use NodeJS to communicate with the Litecoin server. ...
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29 views

Can we get any default address before running getnewaddress?

I am trying to develop some application using bitcoin (currently only in the regtest mode). I am aware that one can create a new address using bitcoin-cli -regtest getnewaddress RPC call, but I ...
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How can I check how many users have upgraded their Bitcoin Core software?

Bitcoin Core has just released their 0.18.0 upgrade. Is it possible to check how many users have upgraded to this version and also how many users are running older versions?
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Bitcoin Core client on multiple computers

I have one computer with a full node bitcoin core. I would like to have bitcoin-qt installed on a different computer but I don't want to download the full blockchain again in the other computer. I ...
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32 views

Outputs only from bitcoin address

I just want to ask is there any way on how to extract ONLY outputs from particular bitcoin address. I need to export (make a list) on all address that were associated with the outputs from the sender ...
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Is their a way to use Bitcoin's Testnet/LN Testnet within CLI without downloading Bitcoind?

I'd like to start working with Bitcoin's & Lightning's Testnet but don't want to download bitcoind on my current computer.
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How to most efficiently keep in sync blockchain on offline computer (including through bitcoin-qt upgrades)?

I have bitcoin-qt running on online computer. I want to: copy blockchain to offline computer (preferably using WORM media for security reasons) from time to time update offline copy with newest ...
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1answer
40 views

Implementation of getdata

I am confused about how getdata() is actually implemented at full nodes. Suppose a full node receives a getdata() request with MSG_BLOCK flag and a hash H of some block B. Then would it simply look ...
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1answer
589 views

Bitcoind daemon: error connecting to the server?

I am trying to create a new bitcoin address and store it in a shell variable $NEW_ADDRESS. When I run this command: $NEW_ADDRESS=$(./bitcoin-cli getnewaddress) I get the following errors: error: ...
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34 views

Trying to understand why hash value is more secure from hash algorithm

I am currently studying in college in the US and was actually curious about bitcoin and cryptocurrencies as a whole. I started looking on free university sites like Stanford university and New York ...
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1answer
184 views

Bitcoin curl no reply

Hi I have made a curl to my server but get no reply . What am a missing rpcuser=rpcusername rpcpassword=rpcpassword rpcauth=rpcusername:generatedkey daemon=1 server=1 rpcport=8332 rpcbind=0.0....
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133 views

Get Coinbase.com miner fee before sending to another address

I am using coinbase.com php library to send bitcoin to another address. But every-time i am sending bitcoin the fee is shown to me after sending the bitcoin. This is causing me some problem. Is there ...
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How to Send BTC from vmnode address to local address using privatekey in testnet?

I created two bitcoin address in VM nod as well as local and dump privatekey for both addresses by using "dumpprivkey" command. Is there any posibitity to send BTC from bitcoin address which is ...
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51 views

How do I move the blockchain file location on Windows?

I tried to edit the storage information for the blockchain. Neither the Windows 7 nor Bitcoin qt could do it (it says that the app can't open the configuration file). So I tried to edit the -datadir ...
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28 views

I am confused about the difference between a fork and a client, can someone explain?

My understanding is that clients are different software environments which run on top of the decentralized computing infrastructure which is the blockchain architecture. The most popular of which by a ...
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Would bitcoin core work on a big endian system? Or even a system where C++'s `int` is not 32-bit?

Looking at the source code of bitcoin core, the serialization part, I see that there's no serialization abstraction layer that accounts for a possible different endianness or different binary layouts ...
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Bitcoin Wallet generation and TX signing [closed]

I am developing a Bitcoin Wallet in Javascript. I've worked on ETH but it's my first time on BTC. Here are following queries if anyone can help: How do we generate bitcoin Wallet like we do in ...
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52 views

How to get multiple connections to the same node

I'm playing around with connecting my node to another one of my nodes to see how many incoming connections I can handle. Whenever I add node A from node B with bitcoin-cli addnode 1.1.1.1 add after ...
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1answer
50 views

Is there a Wiki comparing different wallets?

I am new here so please go easy on me if my question is not written to your standards. If you ask me to make changes, I will make them so that my question is more suitable for this SE. If you look ...
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1answer
59 views

How do different implementations of the Bitcoin Cash client know which type of coin they're processing?

TL;DR: Where in this code does the SV client figure out that it's not processing an ABC blockchain? This image prompted my question. There are a couple different mutually incompatible (I am assuming ...
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69 views

mining: losers get nothing?

if the winning miner takes the 12BTC+fees, unless you own the biggest mining operation out there, or are not a member of the biggest pool, why bother mining, if there is no prize for second place? ...
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Is it required to broadcast the addresses generated locally to the bitcoin network?

Like the transactions are broadcasted to the bitcoin network , is it required that locally generated addresses also need to be boradcasted to the bitcoin network ?
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78 views

How long does it take to validate a full block?

I'm interested to know how long does it take to validate a Bitcoin block on average home pc. I'm less interested in a precise number. I'm fully aware that it can be different between different ...
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1answer
59 views

The BIP32 Extended Keys are different?

I was using the same random entrophy (d2310508c6c5313795dc80a7408b608ffda7176dbedefac00f8114c5dd89a673) to generate the BIP32 Root ExtendedKey (path: m) in the libbitcoin-explorer and web-based wallet ...
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1answer
95 views

BitcoinCore Ubuntu buiild error: ‘relative’ is not a member of ‘fs’

I'm trying to build Bitcoin core client on an LinuxMint. I'm having the following error(which have not encountered before, while making it on MSWindows or another Linux machine) in make process, right ...
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44 views

Mining in the wallet [duplicate]

Someone said me that I should give him my wallet email and then he will request for the mine from the mining network, after that he asked that you will receive email from that u will get code which u ...
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1answer
34 views

Why is there an addrlocal field in the output of the RPC call getPeerInfo, and how SPVs handle it?

According to the Bitcoin core developer reference, the RPC call getPeerInfo has in its output a field called "addrlocal" which holds our IP from the worldview of the peer. Why is this output there? ...