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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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How is the progress field of Bitcoin Core's synchronisation/Initial Block Download debug logs calculated?

The debug.log file during Inital Block Download (IBD) typically includes something like the following1: 2023-09-09T10:04:32Z UpdateTip: new best=...
Lee's user avatar
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Made a report how long for reply? [closed]

I have sent four amounts to same wallet. First two arrived ok. Last two wallet owner claims has not received. I sent owner screen shots from my deposit to confirmed received to my payments included ...
Nadine Gibbons's user avatar
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Hello. How long will it take to transfer my 02/Bitcoin to the wallet that I deposit. Thank you [duplicate]

How long will it take to transfer my 02/Bitcoin to the wallet that I deposit. Thank you
Ghasem Namavar's user avatar
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136 views

Why is there a "progress increase per hour"?

When syncing the blockchain with Bitcoin Core, why is there a "progress increase per hour"? Why wouldn't the syncing rate be constant?
Geremia's user avatar
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How can I recover bitcoin core wallet after encryption with password?

I have backup of wallet.dat file before I encrypted it with password. I also do know the password. I deleted my server and all thing has gone but I have back up of wallet.dat file in computer. I send ...
Xavier Uncle's user avatar
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How does subtractfeefrom work?

From the description of Bitcoin Core, subtractfeefrom is a parameter to define which recipient address would opt-in to receive less and contribute to pay the fee Here is a usecase: Alex has one UTXO ...
Stanley Yuen's user avatar
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How to configure port forwarding to run Full Node with Bitcoin Core using VPN instead setting up port forwarding on router?

I'm running full node with Bitcoin Core, but unable for incoming connections due possible block of my ISP, port forwarding on router doesn't take effect. Then I created a VPN on Proton VPN service and ...
Gilbert Grissom's user avatar
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Bitcoin is for FOOLS [duplicate]

Have you guys run out of FOOLS yet? This is nothing more than a PONZI scheme. So you support censorship as well I see. I am asking a valid question, yet you will not post it? Why is that? Because you ...
Joe's user avatar
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Nonstandard type script's address [duplicate]

I have nonstandard tx output. txid is 03acfae47d1e0b7674f1193237099d1553d3d8a93ecc85c18c4bec37544fe386. And I want to express the tx output with specific unique address. Blockchain explorers all seem ...
Dane's user avatar
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Why changing Bitcoin Cap Limit Is Not Possible

To alter the Bitcoin blockchain protocol, such as increasing the Bitcoin cap, a consensus among the majority (95%) of participants is necessary due to decentralization and the consensus mechanism. ...
Burair abbas's user avatar
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Old wallet, stuck transaction [duplicate]

I have an old wallet from about 10 years ago that I found in Bitcoin Core. I tried sending the balance to a different wallet I use but the transaction just sat as pending. Looking for help on what to ...
Ricky Tamouli's user avatar
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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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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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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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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
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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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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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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 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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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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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
104 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
259 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
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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
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22 views

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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0 answers
40 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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0 answers
44 views

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
0 answers
101 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
23 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
35 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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0 votes
1 answer
49 views

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
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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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66 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
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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
121 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
51 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
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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
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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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