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Questions tagged [bitcoin-core]

A full node implementation of the Bitcoin protocol with a GUI and a wallet. Bitcoin Core is a MIT-licensed Qt 5 GUI application for the original Bitcoin codebase. Additional/previous names include "Bitcoin-Qt", "Satoshi-Client", and "Standard Client".

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Incorrect passphrase after cancelled transaction

Bitcoin Core after sending the transaction showed the incorrect balance and the transaction was cancelled. During that incorrect balance there was a sending operation after which the bitcoin core ...
Victoria's user avatar
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2 answers
34 views

What is the endianness of the target?

Let's take the latest bits value, at the time of writing: 0x170355f0 And convert it to the target: 0x0000000000000000000355f00000000000000000000000000000000000000000 When comparing a candidate block ...
Lee's user avatar
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How do I find out if I have bitcoins I purchased

I remember when they used to call people and sell Bitcoin over the phone I remember purchasing some and either 2008 or 2009 I ended up getting five of them with an actual coin sent to me how do I find ...
Jonathan Haun's user avatar
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1 answer
23 views

Does Utreexo work with a pruned node?

Does the Utreexo UTXO accumulator work with with a pruned node, or must the entire blockchain be present on my local drive before running Utreexo?
Geremia's user avatar
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What is the "extended private masterkey" line of a dumpwallet file?

What is the "extended private masterkey" in a dumpwallet file? It begins with xprv.
Geremia's user avatar
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1 answer
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If I have corrupt/missing blocks but good a chainstate, why do I need to re-download entire chain?

If I have corrupt or missing blocks but good a chainstate, why do I need to re-download entire chain? Why doesn't it just re-download the needed blocks?
Geremia's user avatar
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Consensus Question

With all the recent developments of the spammers and those who want to filter them. I have a few things I don't get. They mention the bug that wasn't fixed (CVE-2023-50428). As I understand, this &...
user151596's user avatar
2 votes
1 answer
73 views

What's the simplest way to test and verify that I am the owner of the fund

What's the simplest way to test and verify that I am the owner of the fund except sending a real coin? In fact, this problem contains two aspects. One is to prove to ourself, and the other is to prove ...
foolbear's user avatar
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1 vote
1 answer
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Understanding Script's number encoding, CScriptNum

What is a simple explanation of CScriptNum, the number encoding used by arithmetic opcodes in Bitcoin Script? What would an illustrative pseudocode/python example look like? What should the encoding ...
Lee's user avatar
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46 views

Load PSBT error: Unable to decode PSBT

I test PSBT in my wallet today, create a transaction in Bitcoin Core, click "send" and "create unsigned", then "Load PSBT from ..." from menu, error shows: Unable to ...
foolbear's user avatar
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Bitcoin wallet Bip38

What is the safes way to tranfer funds from a bitcoin bip38 paper wallet to an online exchange or offline like electrum? Any suggestions?
user151497's user avatar
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1 answer
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Bitcoin Core: "Increasing transaction fee failed (Unable to create transaction. Insufficient funds)"

I sent a RBF transaction, and it's in the mempool. I'd like to increase the fee so it confirms sooner. ¿Why does Bitcoin Core say: Increasing transaction fee failed (Unable to create transaction. ...
Geremia's user avatar
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How do I get Bitcoin Core's estimated confirmation time for a given transaction?

What RPC command can I run with Bitcoin Core (bitcoin-cli) in order to get a transaction's estimated confirmation time?
Geremia's user avatar
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How to decode bitcoin node's chainstate data stored in LevelDB?

I am trying to decode the data available in the chainstate. After doing some research, I see that Google's LevelDB is mentioned (like in this post). However, I am still not sure how to effectively and ...
ram's user avatar
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-1 votes
0 answers
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Connect Sparrow to Old Bitocin Core

I am using Sparrow 1.9.0 and Core 0.12.1. I tried to connect it to sparrow using normal methods, nothing works. I assume cormorant protocol is out of the question, what about bwt? It doesn't seem to ...
John's user avatar
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How to claim funds in a multisig address from a money pool psbt?

Mostly followed this guide on how to create a psbt where multiple users pool money together. Everything is done in regtest. The gist of what I did is as follows: Created 2 different descriptor ...
Psi's user avatar
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Need help with transferring your wallet

Please tell me how to transfer Bitcoin-core version 27.0.0 to Bitcoin 25.0.0 (test) Transferring the wallet.dat file did not help. I want to transfer it, since version 25.0.0 is already synchronized ...
Алла's user avatar
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Running out of RAM with Bitcoin Core

I'm encountering a persistent issue with RAM exhaustion while running Bitcoin Core on my system. Here's a brief overview of the problem: Problem Description: I have a Bitcoin Core node set up on my ...
Antonio's user avatar
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Need help with bitcoin core HD version 27.0.0 (test) [duplicate]

Bitcoin core (test) version 27.0 is installed, fully synchronized. The wallet.dat file has been moved there, but there are no addresses or coins themselves.
Алла's user avatar
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1 answer
86 views

How to generate coinbase transaction in Python?

I know that on this forum a lot of questions on this topic, I have checked most of these, but can't find the solution for my task. I am creating my own algorithm for solo mining bitcoin on Python. I ...
Alex Radik's user avatar
2 votes
0 answers
46 views

How can you remove an input via RBF with Bitcoin Core?

I have an original transaction with two inputs and want to replace it with a transaction that has only one of the two inputs. Original transaction spending from two addresses: input 1: 0,5 btc ⇒ ...
AliceBTC's user avatar
4 votes
1 answer
226 views

Why is my P2P_V2 peer connected over a v1 connection?

Bitcoin Core 27.0 which enables v2 transport (BIP324) by default was released a few days ago. I'm already seeing a few peers with the /Satoshi:27.0.0/ user agent and all of them have the P2P_V2 ...
Vojtěch Strnad's user avatar
2 votes
1 answer
53 views

What does unbroadcastcount in getmempoolinfo mean?

What is the unbroadcastcount in getmempoolinfo? Does it track only the transactions from my wallet that are unbroadcasted? Or does it track all transactions that are not broadcasted which I may have ...
sanket1729's user avatar
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Why doesn't bitcoin use bech32 encoding for transaction_id and block hash?

If I understand correctly, transaction IDs and block digests are typically hex-encoded in the bitcoin ecosystem including bitcoin-core RPC calls, block explorers, etc. Meanwhile, bech32 encoding would ...
user49396's user avatar
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How do miners manually add transaction to a block template?

Here's my idea from the quick research: Miners use getblocktemplate RPC method. In the obtained block template, they remove some transaction and instead place in other transaction that wouldn't ...
pycan's user avatar
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Is it possible to run RPC commands without installing the entire Bitcoind

I am interested to run bitcoin mining https://github.com/jgarzik/pyminer/blob/master/pyminer.py , I understand that it inherently calls bitcoind to run some RPC commands to broadcast once a nonce is ...
Jacksparaaw's user avatar
1 vote
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Can mediantime be used as a proxy for expected time of the most recently mined block?

I'm using Bitcoin Core CLI to get block info: .\bitcoin-cli.exe getblockchaininfo Among other things, this returns two items: "time": 1713464903, "mediantime": 1713461780, I ...
Hannah Vernon's user avatar
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Very slow sync using bitcoin core on Mac mini m1

I'm using an M1 Mac Mini, 8GB memory, 256 GB internal SSD, 2TB Toshiba SSD (which is where the blocks are being stored). Google fiber internet. I've been syncing now for 2 weeks, I'm at 60%. This ...
neils4fun's user avatar
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39 views

What do I do if I bought Bitcoin in 2009 or 2008 [duplicate]

I want to find the Bitcoin I purchased in the past by paying 100,000 won. I remember back then that I made the purchase by bank transfer or phone small payment. Is this the right way to purchase it? I ...
호림아빠's user avatar
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How to get the balance before downloading whole blockchain in bitcoin-core

i didn't work with bitcoin-core before and after i run the app i generate an address and send some bitcoin to it, now the bitcoin-core says i should download the whole blockchain before giving you ...
user150958's user avatar
1 vote
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85 views

Stuck on "Replaying Blocks" 100% after a forced close

I have had issues downloading Bitcoin Core, where the download would get stuck/frozen and not progress for hours. The last time this happened I closed the Bitcoin Core window and was met with a "...
SoRuud's user avatar
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3 votes
0 answers
18 views

How to broadcast transactions in bitcoin regtest mode?

I build three nodes named A,B,C based on bitcoin-regtest image of docker. And these three nodes are in the same network which means they can communicate with each other. In node A, I use bitcoin-cli -...
Lawrence Yang's user avatar
2 votes
0 answers
31 views

libxcb-xinerama0 Library required by bitcoin-qt

I installed bitcoin core 26.1 on a Raspberry 5 (ARM Architecture) running Ubuntu 23.1. Upon running bitcoin-qt, I got the error that the library libxcb-xinerama0 is required but not installed. It's ...
Neo's user avatar
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1 answer
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Testing new releases privately on selected nodes?

I think the main vulnerability of Bitcoin is a new release messing things up in a way that it will completely destroy people's faith in the protocol. By this I mean something like what happened in ...
mathboi's user avatar
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-1 votes
1 answer
40 views

How does one verify signature in a P2WPKH transaction?

(Assume there's no OP_CODESEPERATOR) For standard P2PKH, the signature digest is generated this way: NewTransaction settle the TxOuts well set all TxIn scripts to empty insert the Previous Locking ...
Archit Dabral's user avatar
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1 answer
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how to create txid from transaction.json

Consider this is the transaction.json file: { "version": 1, "locktime": 0, "vin": [ { "txid": "...
Yuvraj Chhetri's user avatar
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56 views

Old encrypted wallet + bitcoin core

I got desperate, I tried all the instructions I could find on the Internet - nothing helps. What I have: wallet.dat from bitcoin-core encrypted from 2015 (in four different places) the password I ...
LamoSS's user avatar
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1 vote
0 answers
50 views

I send sats to the Bitcoin Core wallet I created some time ago without knowing what I was doing and now facing issues with withdrawal I am clueless

Some time ago, I set up a Bitcoin core wallet and sent funds to that wallet a few times thinking they'll be safely stored. Well, they are, and probably too safely. I have a hard time getting funds out....
Najn11's user avatar
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1 vote
0 answers
92 views

Bitcoin core having trouble connecting to peers

New to Bitcoin. I have been trying to host a full node on my Mac. I just installed bitcoin core but while syncing, it seems my node is unable to connect to any peers. I am regularly checking the debug....
Advait Pote's user avatar
1 vote
1 answer
49 views

I can't parse the UTXO from the chainstate

I have a problem with reading tx out from the Bitcoin Core LevelDB chainstate storage. I know that the structure of the current version of the chainstate is key => value where the key is a prefix (...
Novak's user avatar
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2 votes
0 answers
63 views

Bitcoin Core stores public keys and balance unencrypted, a few questions

I came across this statement in the Sparrow Wallet documentation; Unfortunately, Bitcoin Core stores your public keys and balance unencrypted on the computer it is running on. If this computer is ...
FractalEncrypt's user avatar
0 votes
0 answers
15 views

Help me recover my lost Bitcoin wallet [duplicate]

In 2015, I bought around 10 BTC at $400 each. I didn't realize I had them until one of these days, while going through my old Skype conversations with a friend, I found out that I had sold him a ...
Julio Izquierdo's user avatar
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0 answers
30 views

Bitcoind isn't starting as system service for some reason

Have bitcoind.service file in /etc/systemd/system with the following contents: [Unit] Description=Bitcoin daemon After=network.target [Service] ExecStart=/media/user/2TB/.bitcoin/bitcoind-start.sh #...
jurijus01's user avatar
2 votes
0 answers
41 views

Cannot connect Sparrow wallet to node using username and password

I'm trying to connect my node to Sparrow wallet on two computers on the same network. As I understand it, I have to authenticate using username/password option on Sparrow. This is the same computer I ...
nbit846's user avatar
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0 answers
50 views

How do I configure BTCPayServer to use an alternative datadir and avoid 'Unable to open settings file' Error?

Similar to: Ubuntu Linux, Unable to set bitcoin datadir to a folder in different drive and I can't start bitcoind on Raspberry Pi. Why do I need settings.json.tmp when I didn't need it before? ...
Poseidon's user avatar
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3 votes
0 answers
95 views

How do I set up my own custom signet?

Configuration: a Windows machine on a local WiFi network. For classroom purposes I would like to have a custom Signet network so students can get used with Bitcoin Core and Send/Receive. This is the ...
Bart DV's user avatar
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4 votes
2 answers
313 views

Using Bitcoin Core Regtest in classroom

I'm looking for a way to use Bitcoin Core in Regtest in a WiFi network (educational purposes in classroom). The goal is that students install Bitcoin Core, activate Regtest, generate coins and send ...
Bart DV's user avatar
  • 159
0 votes
1 answer
38 views

Bitcoin node GUI shutting down right away

My node was running fine until I decided to change the setting under the network tab, I checked the box for "Use separate SOCKS5 proxy to reach peers via Tor onion services" and on Proxy IP ...
new bit's user avatar
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0 answers
37 views

Bitcoin Core VM and hardware SHA256

It has come to my attention recently that linux machines store info about their cryptographic capabilities in /proc/crypto. A baremetal machine I have shows sha256_ssse3 in the sha256 module parameter,...
RooSoft's user avatar
  • 157
-1 votes
1 answer
23 views

Bitcoin Core Wallet - Google Authenticator?

I know this is probably a weird question, but I need to be absolutely sure. Does the Bitcoin Core wallet offer 2FA through Google Authenticator, kind of like Electrum does? I'm asking because I've ...
Cazes17's user avatar

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