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
10 views

does Bitcoin Core automatically use reindex when you specify txindex=1 with existing sync'd chain?

I sync'd a bitcoin node with Bitcoin Core Qt GUI. Hundreds of GB, naturally. I realized I needed txindex on for Lightning node stuff, so I changed the conf file via the GUI to include txindex=1. I ...
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1answer
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Running both bitcoind and bitcoin-qt for use with lightning

I've been toying around with bitcoin & lightning nodes. I like having the Bitcoin Core Qt GUI around for things, but also like being able to change specific configuration / startup flags (maybe ...
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How bitcoin network manages to append block in front of parallel blocks added by multiple nodes at the same time

Well, according to my research, After solving the cryptographic hash, when the multiple nodes broadcast the block at the same time as a suggestion to be the next block in the chain. How and why the ...
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How Nodes suggests for what the next block in the chain should be by solving cryptographic hash by random guesses

Well, According to my research, Any node can collect a set up unconfirmed transactions into a block and broadcast to the rest of the network as a suggestion for what the next block in the chain should ...
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2answers
66 views

How no body can track anyone on the bitcoin network?

Is this possible, that the person on the bitcoin network cannot be tracked?
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1answer
18 views

Digital signatures are same for each transaction in bitcoin network

I want to know the bitcoin network generates the same signature for each transaction? Because people have only one signature?
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1answer
31 views

How the bitcoin network solves the double-spending problem by adding all the transactions that happened at the same time into one block

According to my research, I understand if person A sends 2 BTC to person B and at the same time person A sends the same input to himself before the input is considered as spent. So, now there will be ...
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0answers
19 views

SHA256 speedup possible if executed on GPU

Is it possible to speed up hashing if hashing is done on a GPU? Does that even make sense or are the CPU instructions faster because for normal signature verification you don't gain by parallelizing ...
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1answer
29 views

What exactly is the relation between Bisq and Bitcoin Core?

What exactly is the relation between between Bisq and Bitcoin Core? It seems like Bisq can function perfectly well without Bitcoin Core, but if you do run Bitcoin Core at the same time, it appears to ...
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20 views

Bitcoin Core keeps “quitting unexpectedly” or hangs up with the rainbow swirls on my Macbook Air + External SSD

I'm running V.20.1 Bitcoin Core on a Mac Book Air. Using an external SSD that's connected via USB C. In the middle of syncing - at random points in time the Bitcoin Core app "quits unexpectedly&...
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1answer
22 views

Is there a flag to allow creating a transaction with multiple outputs to the same address?

Does bitcoin core have a flag to allow creating a transaction with multiple outputs to the same address?
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Pending transaction with bitcoin-core [duplicate]

I performed a bitcoin-core transaction to a Coinbase wallet. I see the transaction pending for two days. What do you advise me to do?
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1answer
24 views

Compiler optimizations for self-compiled Bitcoin Core

If I compile Bitcoin Core using the instructions in the README, does the C++ compiler use compiler optimizations for my current CPU, or will it output a "generic" binary, that can run on ...
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Can a 0 confirmation Bitcoin Core change output be spent?

I have a Bitcoin Core wallet which has a utxo which I spent from, in a transaction where around 1% was sent to an external wallet address, with the ~99% change output remaining in the wallet, sent to ...
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35 views

Can you think of a safe way to safely keep my “spendable” Bitcoin in my situation?

I have my "cold stash" wallet.dat on multiple fully offline, encrypted hard disks/sticks inside a fireproof safe. I never seriously considered printing them onto paper because that would be ...
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29 views

buy your bitcoins [closed]

I do not trust exchanges they robbed me
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23 views

What settings required to privately run bitcoin core on tails?

I am running bitcoin-core on TailsOS which seems to work out of the box. I think TailsOS blocks all unsafe requests but I would like to know what settings I should enable to run it really privately. ...
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Hi, I invited 4 people through the link and they registered. But in the INVITE LEVEL 1 COMPLETED section Not added. Why? [closed]

I invited 4 people through the link and they registered. But in the INVITE LEVEL 1 COMPLETED section Not added. Why?
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1answer
67 views

How is the balance of a Bitcoin address quickly calculated?

For what I understand, the balance of a Bitcoin address is the total sum of UTXOs of that address in the entire blockchain. The current size of the blockchain is around 350GB. How is the total sum of ...
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1answer
24 views

Segwit transaction - Non-canonical DER signature

Error (when sending) error code: -26 error message: 64: non-mandatory-script-verify-flag (Non-canonical DER signature) Transaction ...
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1answer
21 views

BLS signature verification?

Is it possible to perform BLS signature verification with upcoming Taproot/Tapscript proposal?
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2answers
53 views

Very slow sync on low end PC - what to upgrade?

[Hi, I have to re-ask this question because I cannot recover my account from the last one. Sorry about that.] I am a newbie to bitcoin. I am trying to sync a full node on my low end PC: 2g RAM, dual-...
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2answers
43 views

Bitcoin Core for ARM-based Macs?

Should we expect in the foreseeable future a Bitcoin Core release optimised for ARM-based Macs?
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0answers
14 views

“Invalid address” when trying solo mine with bfgminer

I am trying to mine solo. I have installed BitCoin Core on my Windows box, set up incoming connections and wrote in config file <BitCoinStore>/bitcoin.conf server=1 rpcuser=myusername ...
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0answers
29 views

Signing Transaction Failed

Tried to make a transfer from Bitcoin QT from version 0.9.3 and an error appears "Signing Transaction Failed" but wallet was not fully synced with network yet, im still waiting. Core wallet ...
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1answer
29 views

What bitcoin core options can be changed without a restart?

I often experiment with new bitcoin core options (like zmq, debug and fee options) and I would like to avoid restarting my node for them to take effect. If I am not mistaken, changing the RPC password,...
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18 views

Use Expect scripts to monitor and control bitcoin-core

I'm thinking about an Expect script to monitor and control my bitcoin-core client (on Linux). Who has experience, is there already a set of scripts and/or what are your thoughts?
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2answers
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Partially Signing multisig rawtransaction returns redeemScript/witnessScript does not match scriptPubKey

I want to partially sign a rawtransactions using bitcoind through RPC but I am really stuck almost at the end of the process when I try to sign my manually created raw transaction and I spent many ...
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2answers
253 views

Reproducible Gitian Builds .. but not the same hash as bitcoincore.org

Bitcoincore.org and Bitcoin.org will let you download a tarball for bitcoin v0.20.1 When they do it bitcoind: 4ec74161b2a90293926ae8e20a2efbe952bd23b53aeebf051e6a6285ace18271 bitcoin-0.20.1-x86_64-...
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0answers
10 views

How to accelerate the long time for bitcoin-core to sync the blockchain? [duplicate]

How can I accelerate: the process of sync'ing bitcoin-core for console usage? Pokey internet. Can't I sync recursively and in the background? Just looking to learn by playing and using console ...
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33 views

Starting bitcoind for the express purpose of creating a wallet?

Referencing this solution: My favorite method: grab out a old/unused pc/mac install a linux over usb (maybe Talis) (make sure your USB stick is clean!) download a recent version of bitcoin-core (...
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1answer
41 views

What needs to be written down for a paper wallet?

I'm installing bitcoin-core with snap on Ubuntu for a dry-run at generating a paper wallet. Perhaps naively, I thought to "write down" something like: nicholas@mordor:~/bitcoin$ nicholas@...
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1answer
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Has/will there ever been any new “Bitcoin Gold rush” similar to the hard forks that allowed you to “trick” your way to new coins? [closed]

A couple of years ago, there was this really unexpected and bizarre thing for a few months (or weeks?) where a bunch of Bitcoin hard forks were created, such as "Bitcoin Gold", whose only ...
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1answer
27 views

PSBT encoding : what's the aim of convertBytes function?

I'm currently working on PSBT and I try to understand all the part of the original implementation. Dealing with base64 PSBT encoding: it seems that we convert the buffer from a base 8 to a base 6 ...
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3answers
54 views

The best JavaScript libraries supporting Bitcoin Core?

I have downloaded and installed Bitcoin full node on my Linux server and I'd like to start working with the bitcoin core to create wallet, addresses, and transactions. What is the best JS libraries ...
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0answers
33 views

Bitcoin QT Pre-2013(ish) .. Hard drive with possible 6 BTC on it just turned up.. Couple of questions

Big question I want to get out of the way; How have I "forgotten" about this, what with the value being what it is? Well, fundamentally, the BTC were not worth anything like today. My (still)...
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2answers
36 views

bitcoin-qt ignored user input for fee calculation

My blockchain isn't synced yet. Thus, fee calculation didn't work. Therefore, I chose user defined fee and entered what btc.com suggested. But my bitcoin-qt (v0.20.1) went for 255 satoshis instead of ...
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0answers
41 views

What's with this very mysterious and cryptic message from Bisq?

Why does Bisq care about Bitcoin Core being installed or not? Why does it matter if it's "fully synced" or not before Bisq is started? Why does it matter if it's "running in pruned mode&...
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0answers
16 views

How can I install Bitcoin Core without having a 350GB harddrive? [duplicate]

I would like to run Bitcoin Core on my laptop with approx 100 Gb of HDD available. From the installation instructions I understand that a full node must initially download the full approx. 350 Gb ...
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0answers
14 views

Getting “N5boost10filesystem16filesystem_errorE” error when running bitcoin-cli

Backstory I'm running Bitcoin Core 0.20.1 on a Raspberry Pi 4 (running Raspberry Pi OS standard). It's just a standard install of Bitcoin Core, I built from source and installed into /home/pi/.bitcoin ...
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0answers
38 views

Will Upgrading Ram on Low End PC Make Core Sync faster?

I am a newbie to bitcoin. I am trying to sync a full node on my low end PC: 2g RAM, dual-core 2ghz, 250 gb regular HDD. It is in pruned mode. The initial 15% synced in a few days but now the process ...
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0answers
12 views

Transactions with Bitcoin Mockup/Method

As I haven't got many resources I am unable to test this method however before I spend the time investing in servers and such, I would like to show my idea as to how I will be handling a payments ...
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1answer
28 views

Advanced math operations in TapScript?

Hence BIP 342 proposes to enable opcodes like OP_MOD, OP_DIV, OP_MUL is it possible to perform advanced math operations like EC point addition/multiplication in a script size of up to 10kB?
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1answer
76 views

can't remember due to drinking [duplicate]

About 10 plus years ago, I was drinking heavily and decided to go online and buy some bitcoin. Since it wasn't worth much at the time, I just kind of forgot. But now I'm bummed that I can't recall ...
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1answer
38 views

Change -mempoolexpiry in BitcoinCore 0.20.1

I have accidentally made a transaction with a very low fee (5 sat/byte) and I doubt that it will be confirmed any time soon. Replace-By-Fee is not available since my transaction has no change. Abandon ...
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1answer
253 views

When does Bitcoin update the UTXO set?

I am kind of confused with something. I hope you can clarify it for me... Let's say I want to make a transaction. So my exchange wallet does that for me. The way it does this is it first grabs the ...
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1answer
33 views

how does merkle root building work for empty array?

It's known that even if no transactions get created, bitcoin still creates a block with empty array of transactions. In this way, I am curious what the merkle root would be. How does bitcoin figure ...
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1answer
15 views

how does bitcoinjs-lib grab utxo

So, Let's say I want to create a transaction by using bitcoinjs-lib. As far as I can see, this library doesn't provide the help so that it can automatically figure out/grab unpent transactions for ...
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0answers
14 views

Unconfirmed btc payment [duplicate]

It has been 6 days someone sent btc to me and it isn't confirmed. This is the explorer link https://sochain.com/tx/BTC/daa81a99ef4753995955c9d2b728cbf3d2b65297fb421eacd604ec49beec6b0d Kindly help on ...
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1answer
19 views

Is it possible to forward signed transaction using bitcoind prune mode?

Summary: Is it possible to perform createrawtranscation , signrawtransaction and sendrawtransaction rpc call using bitcoin in prune mode? Detail : I want to implement an API that performs p2p BTC ...

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