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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1answer
64 views

Why is getdescriptorinfo returning an error “Invalid descriptor (code -5)”

I am using Bitcoin Core bitcoin-cli with getdescriptorinfo like so: curl --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "getdescriptorinfo", "params":["sh(multi(2,[3c60330a/1]...
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2answers
56 views

Does number of inputs or outputs affect bitcoin transaction fee?

I would like to know how inputs and outputs affects my bitcoin transaction fee using legacy address, and how using a segwit address will decrease the same transaction? and how they will be ...
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1answer
23 views

bitcoincore connect

I have a problem with bitcoin node is that when I want to get out of the full node bitcoin server. I ran this method and it does not work curl \ --user myusername \ --data-binary '{"jsonrpc&...
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1answer
16 views

Bitcoin Core ZMQ “hashTx”

Bitcoin Core ZMQ messaging system has hashtx along with 4 other topics. But nowhere it is documented whether the transactions that comes from hashtx are confirmed transactions which are added in a ...
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4answers
170 views

How bitcoin application in production retrive UTXO's

AFIK, UTXO of an address cannot be retrieved using bitcoin-core, without importing the address in the wallet. How are application in production able to get UTXO ? Does all the application use ...
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1answer
92 views

Where is the bitcoind executable on Windows 10?

I have installed bitcoin core 0.17.1 version windows 10 in my laptop. I can see the following folders: bin (bitcoin-cli.exe, bitcon-qt.exe, bitcoin-tx.exe, test_bitcoin.exe), include (...
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1answer
79 views

What positive effects can Quantum Computers have on the Blockchain technology and hence Bitcoin

Quantum Computers We always fear what we do not know. This statement has been proven right throughout the history of mankind and has resulted in significant evolution, even though there was always ...
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1answer
71 views

bitcoincore banned all peers and I can't to sync

I started downloading the chain and got to 14% and it just stopped and still shows 7% per hour but not moves. I checked and it banned all the peers and everytime I unban them they just get banned ...
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1answer
20 views

Version prefix used for Bech32 addresses

I was compiling a table for Version prefix (hex) and Base-58 result's prefix for different types of Bitcoin addresses. I came across the content here: https://en.bitcoin.it/wiki/...
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1answer
20 views

I need help on how to change the disk to run my bitcoin core wallet

Long time ago I transferred my wallet on My Passport an external hard disk. I have not opened bitcoin core for over 8 months. I opened it 2 days ago, the dialog box opened, which normally doesn’t and ...
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1answer
34 views

How to create bitcoin coin , coinbase transaction?

I know about createrawtransaction '[{"txid":"0000000000000000000000000000000000000000000000000000000000000000","vout":0}]' '{"39jbHRLG6Z2KgXLHR3BWgbccZde1Moo15k"...
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1answer
891 views

Version field in transactions, blocks, etc

A field labelled "version" appears in many contexts regarding the Bitcoin protocol. Sometimes one uses the current version of the Bitcoin client (version message), sometimes 1 is used (block, tx), why ...
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1answer
93 views

lightning network bitcoin howto install

Hello fellow bitcoiners, I would like to install lightning over Bitcoin core - I already have a full node. But every guide I follow ends up with a broken build or some issue preventing to finish the ...
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2answers
21 views

Change IBD Location Prior to Download

I'd like to run Bitcoin Core but my laptop can't handle the load. I have an external drive with enough space, but I'm unsure if/how to change the file destination upon opening the program. Is this ...
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0answers
2k views

Old (2010) Wallet - Can't figure out best and safest way to extract

The following is based on my very limited understanding of the software involved in Bitcoin (I have a reasonable understanding of the structure of Bitcoin itself at a high level). I read an article ...
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2answers
33 views

Unable to createrawtransaction - “Input not found or already spent”

I need help. I have createrawtransaction as per the screenshot but then, unable to signrawtransactionwithkey, I have insert WIF Private Key and it state that "Input not found or already spent&...
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2answers
259 views

in bitcoin core, how to use Tor for broadcasting new transactions only?

I have set up a full node with bitcoin core running on the internet. I have also set up a wallet running on a private machine that communicates to the full node to broadcast new transactions. To ...
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2answers
34 views

How to Create or Generate a New UTXO in Bitcoin Core?

I know how to use Console in Bitcoin Core but not that expert. I would like to ask is there possible for me to generate or create a new UTXO in Bitcoin Core? All I have with me are the list of TxID ...
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0answers
29 views

Score value of my node is not rising

I'm running Bitcoin Core 0.20.1 in Debian Buster. I run the daemon behind Tor network. My current settings are: /etc/tor/torrc SOCKSPort 9005 ControlPort 9501 HiddenServiceDir/var/lib/tor/bitcoin-...
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1answer
20 views

Difference between bitcoin-cli getnetworkinfo version and bitcoind --version

I tried to upgrade bitcoin core from 0.18.0 to 0.20.0. When I ask for the version through bitcoind bitcoind --version it prints Bitcoin Core version v0.20.0 but if I ask for the version through ...
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1answer
272 views

wallet.dat on usb to electrum

I put my btc qt wallet.dat file on a USB and would like to open it on a software wallet. Preferably electrum. Is that possible? If so how? Too many problems with btc qt and takes forever to sync.
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3answers
47 views

How exactly does “CoinDance” determine the current number of public Bitcoin nodes?

On this URL: https://coin.dance/nodes It says how many public Bitcoin nodes are currently active in the world, and how many Bitcoin Core ones. While it's good that I can grab these numbers from that ...
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1answer
63 views

How to use bitcoin from the command line in Windows?

Do there exist any stable and audited bitcoin wallets that can be used from the cli on Windows? I have looked but have been unable to find any that I can use for automated tasks.
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2answers
157 views

Security risks with running bitcoin core, and how to protect yourself

I'm new to bitcoin and want to help the network by running a full node. I plan to download bitcoin core from the bitcoin.org website, and run it on a spare laptop, by my concern is how do I protect my ...
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1answer
43 views

How to connect a bitcoin node to a complete node through the local network?

I currently have a full bitcoin node on my local network and I would like to create another node but only update it by local network. I have tried with: ./bitcoind -connect<iplocal> ./...
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1answer
36 views

After a long connection to the wallet, it offers to reinstall blocks and synchronize all Bitcoin core blocks

1)I installed bitcoin core on an ssd drive. Some time did not include it, a month after the inclusion of bitcoin core when you start the application with ssd asks to re-download all the blocks, the ...
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1answer
32 views

listunspent rpc/cli command doesn't seem to list unspent unconfirmed transactions for watch-only addresses

I am unable to list unspent unconfirmed transactions for watch-only addresses. Once the transaction gets at least 1 confirmation it gets included in the returned result. This is the command I am ...
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2answers
121 views

What are the web3py equivalent for communicating with bitcoin in Python?

I am fairly new to working with Python, I have a requirement where I need to perform some basic bitcoin operations on my local system rather than relying on some external API's, those function mainly ...
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2answers
31 views

what does segwit remove?

It's said that Segwit removes signature data from transactions which makes block have more space for more transactions. Question 1) If SegWit removes signature data, where does it put it exactly ? ...
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0answers
18 views

how does node remove conflicting transactions from memory pool?

Sorry for the long text. This is just my observation and was wondering if you could let me know if I am correct or not. Case 1) Let's say minerA and minerB both have the same transaction in their ...
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1answer
44 views

how does node create UTXO from blockchain for the first time?

Let's say I am a new node. I try to synch with the full node to grab the whole blockchain. Now, I synced with it .It's time for my node to create UTXO database .. How does it do this exactly so that ...
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1answer
54 views

How to run Bitcoin Core as onion service on Windows, Ubuntu and Android?

Have you tried running Bitcoin Core listening on Tor on different platforms? What are your experiences, issues that you faced, hacks, workarounds etc.?
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1answer
34 views

Do full nodes store the complete merkle tree or do they regenerate it when creating a merkle proof?

I understand what the merkle root is for. And I understand that blocks don't store the merkle tree. Question 1) Is there any place that the complete merkle trees get stored? I don't mean the merkle ...
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1answer
25 views

Blocks seem to store only txIDs, where does the transaction data come from for IBD?

I know that blocks store transactions. After looking into a block, I can see that it only stores txIDs. Question 1 - Where are actual transaction objects stored? If you tell me that it's stored in a ...
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2answers
324 views

RPC call to get unconfirmed balance on a watch only wallet

We have a bitcoin core client running on a production machine. This machine cannot have the private key so each address is added as watch only. So far it has worked perfectly, but recently we need to ...
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2answers
1k views

Installing bitcoin and bitcoincash on same server

I have installed bitcoin core by using its source code in my amazon server by using the instructions given in the below youtube link https://www.youtube.com/watch?v=tG_24G7bj_w Some portion of the ...
3
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1answer
87 views

How do I calculate transaction fee for call to createpsbt()?

When my user invokes my app, he passes as an input parameter the desired value of the TX fee in satoshis per byte. I create a PSBT by calling createpsbt(). I exert complete control over the ...
2
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2answers
119 views

When using bitcoin-cli I get an error regarding fallback fees when trying to send regtest Bitcoin. How do I resolve this?

I have been doing an assignment on Bitcoin Core 0.20. Now every time I try to do a transaction: Apples-iMac:bitcoin apple$ bitcoin-cli -regtest sendtoaddress ...
2
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0answers
21 views

Does a Bitcoin Core wallet backup cover receiving addresses?

I have a Bitcoin Core wallet installed on my computer (from https://bitcoin.org/en/download). When I create a backup, will it also back up my receiving addresses? For example, I have give my address ...
2
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1answer
77 views

Possible race condition(double spend) on HTLC-Timeout in the lightning network?

From the offered HTLC Outputs, # To remote node with revocation key OP_DUP OP_HASH160 <RIPEMD160(SHA256(revocationpubkey))> OP_EQUAL OP_IF OP_CHECKSIG OP_ELSE <remote_htlcpubkey> ...
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1answer
91 views

Bitcoin core 0.19.1 RPC, 'sendtoaddress' not working!

Suppose this scenario: There are 2 wallets called wallet1 and wallet1 on the same node in testnet blockchain. wallet1 balance: 0.001 BTC wallet2 balance: 0 BTC I am trying to send 0.001 BTCs from ...
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0answers
17 views

nodes are run to get rewards or just to help bitcoin [duplicate]

I wanted to make a share of my help in bitcoin validation. my question is do Running A Full Node to validate transactions pays reward back or not so I can also benefits from my help to the community
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2answers
49 views

When I try to download Bitcoin Core on MacOS it says “Apple cannot check it for malicious software”? Is it safe to download?

Brand new Mac Mini, latest macOS Catalina (10.15.6 (19G2021)), followed instructions on bitcoin.org download page. Double click Bitcoin Core.app, and I get: “Bitcoin Core.app” can’t be opened ...
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1answer
20k views

What's the difference between bitcoind and bitcoin-qt? Different commands?

This is a multi-part question, mainly do to contradictory information from different articles. It's got me all confused. From my understanding, bitcoin-qt is just a GUI version of bitcoind - which ...
0
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1answer
186 views

How do I use an issued API key in my python 3 script to bypass the request limiter?

I got an API key from blockchain.info to bypass the request limiter, but I don't know how to use it and I can't find any relevant info online. url = "https://blockchain.info/rawblock/" + str(s) ...
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0answers
26 views

How to split a Bitcoin Core wallet

I have an 'omnibus' wallet.dat which holds balances for multiple parties which I would like to disentangle and split. The UTXOs are not blended, each UTXO is owned by a given party in whole and there ...
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1answer
67 views

How can I get address's balance that doesn't belong to my Bitcoin core wallet?

I have been looking for a way to see the address's balance that doesn't belong to my own Bitcoin core wallet. I don't like to use an external API, I have this full node and I really wonder if this is ...
1
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1answer
151 views

Why has Bitcoin Core stopped shutting down when Windows cleanly shuts down?

Every night, I do this to turn off my Windows 10 machine: shutdown /s Note that there is no "forcing flag" or anything (/f). Up until recently, Bitcoin Core appeared to always get the ...
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0answers
29 views

Was bitcoin peer to peer network affected because of the recent BGP hijack incident?

Can someone ELI5 BGP hijacking, impact on Bitcoin, countermeasures and if there were any issues because of the recent incident? Related links: https://twitter.com/ProtonMail/status/1311013829514539011 ...
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0answers
36 views

Bitcoin “scantxoutset” rpc command return response too slow

For one of our decentralized mobile wallet, We need to fetch balance of imported BTC address quickly. After lot of research on google then I found Bitcoin deamon rpc command "scantxoutset", ...

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