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.
628
questions
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19 views
Blocking Port 8333 and other open channels in bitcoin core
in another post someones wrote,
Bitcoin nodes use to communicate with each other. You can disable
incoming connections on your node if you don't like that (set listen=0
in bitcoin.conf).
Now i ...
0
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1answer
23 views
Bitcoin full node - how to run a pruned node, explaining pruning?
can you explain please how I can run a "pruned" node instead of storing all 300GB of data? Is there a difference how you turn your btc client into "pruning" mode among the different clients, bitcoin ...
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1answer
27 views
Bitcoin Core full node wallet - questions about security & recovery
can you tell me pls,
1) Which secure full node wallet implementations exist? Currently I just know of bitcoin core. Is there not any other one with a GUI?
2) Can you use a Ledger device with those ...
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0answers
29 views
How to run bitcoin core in the cloud with virtual server?
can you please explain to me, or link me to other understandable sources, how you can use bitcoin core with a cloud provider?
My intent is to not physically have an own server but to use a cloud ...
0
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1answer
26 views
How to Construct a Ping Message
I am struggling greatly trying to figure out how to send a basic "PING" message, and receive back a "PONG" response.
import random
import hashlib
import socket
PEER_IP = "35.187.200.6"
PEER_PORT = ...
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0answers
17 views
How long does it take to crawl and map the bitcoin network?
There are several websites that have data on the number of nodes in the network. For instance coin.dance. About how long does it take to map the entire bitcoin network?
1
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1answer
39 views
running bitcoin-cli -testnet getblockchaininfo
Hello when I run this command (bitcoin-cli -testnet getblockchaininfo) I get this:
{
"chain": "test",
"blocks": 0,
"headers": 0,
"bestblockhash": "...
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0answers
22 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 ...
1
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1answer
33 views
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 ...
1
vote
1answer
55 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 ...
2
votes
1answer
50 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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0answers
38 views
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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0answers
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 ...
6
votes
1answer
167 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 ...
1
vote
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 ...
3
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0answers
39 views
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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0answers
27 views
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 ...
4
votes
1answer
117 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 ...
2
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1answer
185 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'...
0
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1answer
51 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 ...
2
votes
1answer
49 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 ...
0
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0answers
27 views
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 ...
1
vote
1answer
105 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 ...
1
vote
1answer
130 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 ...
0
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1answer
90 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, ...
1
vote
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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0answers
36 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!
0
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1answer
70 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 ...
2
votes
1answer
164 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-...
6
votes
1answer
1k 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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0answers
196 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.
...
0
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1answer
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 ...
0
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0answers
26 views
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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0answers
30 views
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 ...
0
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0answers
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 ...
0
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0answers
18 views
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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0answers
41 views
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 ...
0
votes
1answer
43 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 ...
0
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1answer
661 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: ...
1
vote
2answers
38 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 ...
0
votes
1answer
219 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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0answers
142 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 ...
0
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0answers
25 views
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 ...
0
votes
1answer
54 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 ...
0
votes
2answers
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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vote
2answers
37 views
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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0answers
37 views
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 ...
2
votes
0answers
54 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 ...
1
vote
1answer
52 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 ...
2
votes
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 ...
