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
15 views

If nonce can change the hash then it should be changing the next block's previous hash?

I am studing blockhain and i know that a block hash is linked to the next block in previous hash and it cant be changed for valid reason. Reason is : because if someone have changed hash then then he/...
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0answers
7 views

How to save the mempool information immediately before the node receives a block?

I want to use Bitcoin RPC API 'getrawmempool' to save the snapshot of the mempool immediately before my full node receives a block. This requires modification of the Bitcoin source code. How should I ...
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0answers
22 views

Get/Calculate Address

I'm currently using a program that analyses the block files. It splits all the stuff into multiple .csv files. Is there any method I can do to get the addresses & amount sent/received from tx_in ...
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0answers
16 views

Python Code - import error : cannot import name “privtopub” from 'bitcoin'

Hello everyone when I start this code on PYCHARM looks like no problem. But when I turned this code from python to exe and exe don't start and it says: import error: cannot import name "...
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0answers
11 views

How to generate bip-0032 bitcoin?

How to generate bip-0032 bitcoin ? Is there any script to generate bip-0032 ? https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
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19 views

what is the longest period for a bitcoin transection to be confirm?

It's been three months but the bitcoin transaction has not been completed. Can anyone inform me?
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1answer
168 views

Bitcoin core has been stuck syncing to the network

This keeps repeating in the log file: 2020-04-16T23:59:53Z ERROR: AcceptBlockHeader: block 0000000000000000000fb8b3828b04c17205ffcdedddc8be1d400d132d336460 is marked invalid
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2answers
126 views

Is there a way to change Bitcoin Open Source code to be more Environmentally friendly?

If Bitcoin is open source as proponents mention, why can't make Bitcoin as environmentally friendly as Ripple, Dogecoin, Cardono etc? Elon Musk tanked the market by mentioning Dogecoin is More ...
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1answer
36 views

How exactly does bitcoin code change happen in a decentralized system

I have long been under the assumption that bitcoin was just a "protocol" or a "contract“. Different nodes run their own implementation, on different hardwares. Some are efficient, some ...
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0answers
17 views

Bitcoin Core's mempool policy and inherited RBF

Why is inherited signalling not implemented in Bitcoin Core's mempool policy as mentioned in BIP 125 or implemented in btcd? Inherited signalling: Transactions that don't explicitly signal ...
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1answer
50 views

Different address prefixes for different address types / network combinations

I'm working on a bitcoin project, and understand the differences between the wallet address which start with 1, 3, or bc1. I am looking to generate a wallet address that starts with 1. I have seen the ...
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2answers
2k views

Why is bitcoin core failing to build on Ubuntu?

I am trying to build bitcoin core from source using Ubuntu 17.04 with this guide: http://bitzuma.com/posts/compile-bitcoin-core-from-source-on-ubuntu/ The build fails when I use sudo make. The ...
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1answer
32 views

Unable to return BlockHashes when I run this generatetoaddress

I have downloaded and fully synced with my Mac last Saturday, my Bitcoin Core version is v0.21.0 and my Bitcoin-Qt version 5.9.8. I did run other RPC commands such as "getrpcinfo" and it did ...
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2answers
635 views

Is it possible to run two Lightning Network nodes on top of single Bitcoin Core node?

I would like to simultaneously run LND and Eclair nodes on top of single Bitcoin Core bitcoind node. Is it possible? I wasn't been able to pull it off so far. If possible, how to set up ZMQ and ...
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1answer
37 views

In Bitcoin core 0.21 which command replaces getaccountaddress

In Bitcoin core 0.21, which command replaces getaccountaddress? Is there any way to get the same data as getaccountaddress in 0.21?
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0answers
21 views

Arbitrage Opportunity for Miners

I am thinking of the arbitrage opportunity for the miners by reordering or any sort of manipulations in transactions waiting for confirmation. I observed such a case in Ethereum(a paper), but not ...
1
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1answer
48 views

I found 10 different wallet.dat files on my computer. How can I tell which has money in it? Bitcoin-core-qt

In cygwin I did "find / -name wallet*.dat" and found 10 wallet*.dat files on my Windows box. Some have 2005 dates, some are newer. Q: How can I determine which one has the money in it?
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0answers
39 views

Why isn't this Lightning Network (or something similar) way more heavily promoted? [closed]

Every time I think about the fees for Bitcoin transactions, I'm shocked. They have made it impossible for me to launch my project since nobody in their right mind will pay as much in fees as for the ...
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1answer
36 views

Accessing bitcoind from python module hits error

I am experimenting with the blockchain a bit, specifically trying to use the python-OP_RETURN module to put a few bytes into the blockchain op_return field. To use this module I blv I need a running ...
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1answer
100 views

Hash rate, transaction and block relationship

I'm aware that when the hash of the block header (block hash) is below the difficulty target, a block is deemed as validated. But because I've never run a bitcoin node before (will soon), I had a ...
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1answer
22 views

Is it correct to say that continuous transactions are on different blocks most of the time?

I'm new to the idea of bitcoin and I'm taking an introduction course about it. Given the following picture from the original bitcoin paper, is it correct to say that continuous transactions are on ...
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2answers
69 views

fundrawtransaction - what is it?

I find on Internet interested article. How I understand the raw transaction can be created simpler without fundrawtransaction. bitcoin-cli listunspent [misconf=1] [max_number_confirmation=99999999] ''...
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1answer
18 views

Bitcoin - Level DB - Block Index - Parsing value for block hash

I am trying to read the value against block hash in level DB of Bitcoin node database - Block/index. For Genesis block, I get 88 bytes which I want to parse. I tried to follow instructions in https://...
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1answer
91 views

ListWalletDir: Access is denied D:\System Volume Information

My BTC Core wallet is not yet fully synchronized, now I got this message in the debug Notepad ''List Wallet Dir: Access is denied D:\System Volume Information'' and whenever I move the mouse over the ...
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3answers
2k views

bitcoin.rpc python library problem

I am working through Master Bitcoin. I got the bitcoin client up and running. I am now trying to access the client from python. In the example, there is a line that says from bitcoin.rpc import ...
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1answer
46 views

understand bitcoin transaction json extracted from blockchain

i'm trying to understand bitcoin transaction extract from bitcoin core with RPC, with an example this block hash : 00000000d14f2e97678951ad004d6699babd27e07ca722c46b30dc24c67eed7a {"method": ...
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1answer
131 views

Calculate Unspent using private keys

Can we calculate unspent of addresses which are generated from other node server if we are having private/public key of those addresses?
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0answers
27 views

How to decrypt encrypted_privkey

Background how I got here: I have a very old wallet file in .dat format (from 2017) The backup is as far as I remember just a copy of the wallet file from bitcoin-core's ~/.bitcoin directory. I tried ...
2
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1answer
33 views

Where change the size of the window in Bitcoin code?

I already try changeing the height and width parameters of the forms in src/qt/forms but nothing changes, where else i need to look?
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1answer
18 views

Why are adresses not showing up in gettxout?

I have a bitcoin node but whenever i try to gettxout i get this response: user@bitcoin:~# bitcoin-cli gettxout "0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098" 0 { "...
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0answers
18 views

wallet.dat corrupt. Try using the wallet tool bitcoin-wallet to salvage or restoring a backup

I'm trying to restore an old wallet, using bitcoin-qt 0.21 but I'm getting the following error on startup: wallet.dat corrupt. Try using the wallet tool bitcoin-wallet to salvage or restoring a backup ...
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2answers
2k views

Is there something about Bitcoin that prevents us from implementing the same privacy protocols of Monero and Zcash?

Certain coins like Monero and Zcash implement privacy protocols that make it nearly impossible to trace origin and destination of transactions - making them completely anonymous. I'm curious as to why ...
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1answer
60 views

Can I restore an additional address of Bitcoin Core

Once in Bitcoin Core I created an address to receive some payments from a faucet. After years I reopened the Bitcoin Core and started to synchronize it. After a while there was a crash, and I decided ...
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1answer
36 views

How to create a physical/paper backup for bitcoin-core wallet?

I am using bitcoin-core for my offline storage. In electrum I can do a paper backup by writing down the mnemonics. bitcoin-core seems to be using a different mechanism to generate the wallet. What I ...
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1answer
47 views

What happens to the bitcoin mining if the device changes?

First I've opened this site via mobile and registered with a Google account. Some time later, I continued to mine bitcoin through my laptop with the same account. Will this device change make it ...
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1answer
28 views

Bitcoind information about the input and output

Im trying to get the wallets/accounts the money got sent to. But getrawtransaction does not give any information about the reciever or sender
0
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1answer
21 views

listtransactions weird offset workflow

I need to extract last wallet transaction. But seems listtransaction has some wrong logic. When I perform this function listtransactions '*' 50 9 it just return me first records not last. In my case ...
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0answers
29 views

Debugging does not work after v0.21 tag

If I clone Bitcoin Core from the repository and switch to version v0.21 (git checkout tags/v0.21.0), the debugging (gdb src/qt/bitcoin-qt or gdb src/bitcoind) will work as expected. But If I clone the ...
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0answers
32 views

How can i locate my deceased husbands bitcoin? [duplicate]

My husband passed away 4 years ago and he bought a lot of shares in bitcoin when it first became a thing. How can i find out who he purchased these through in order to accuquire about his shares?
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0answers
15 views

DB Structure for bitcoin blocks

https://github.com/blockchain-etl/bitcoin-etl#schema I found a library to parse the block data in json format. I want to parse that json and put it into a db to then use that for calculating balances. ...
0
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2answers
68 views

Found Bitcoin Core Wallet with unconfirmed Transactions, anything to salvage? [duplicate]

I am currently looking through old .dat files and found a wallet with two "Received with" transactions that are unconfirmed. When I enter the address from the Label on blockchain.info the ...
4
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1answer
433 views

How can I use Bitcoin Core with the anonymous network protocol I2P?

How can I use Bitcoin Core with the I2P anonymous network protocol?
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1answer
21 views

aftet sending btc with bitcoin core can i exit after wards?

I have bitcoin core installed on windows with full node running. If I send bitcoin do I need to wait its confirmation before exiting bitcoin core ? can I exit in seconds afterward will it be confirmed ...
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2answers
110 views

Bitcoin Fraud/Recovery Protocol Proposals

Does Bitcoin plan to implement any Fraud/Loss Prevention in their protocol? I just read a story of how Brokerage Exchange Shapeshift, and Internal Employee stealing private keys from their customers. ...
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2answers
2k views

Is there developer documentation for the Bitcoin Core source code?

Is there a documentation somewhere to understand the C++ code of Bitcoin Core (available on Github) "from a to z" and being able to recreate it ?
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1answer
34 views

How to quickly get the target of the next block to be mined from bitcoin-core over RPC?

The target for the next block is available in getblocktemplate but I can not figure out if there is a way to get the target without also getting all of the pending transactions, which can take a very ...
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0answers
25 views

Im in desperate need of some advice!

I moved money from my wallet to someone elses wallet over a year ago and they said they never recieved it. Im now desperate to track the money down. Ive found it. But its sitting in a wallet and I ...
3
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1answer
67 views

When you make a Bitcoin transaction, can the receiving person (and the world?) really see how much coins you have in the entire wallet?

I really hope that I've got this horribly wrong, but I have to ask... I have this idea, which I base on comments and explanations I've heard over the years, that when you make a Bitcoin transaction, ...
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2answers
264 views

How to make concurrent calls to bitcoin core rpc?

I am trying to call getBlock for 100k blocks, but it is too slow to call them sequentially. This is what I am trying. I have a full node of bitcoin core running. I set the -rpcthreads=100 and -...
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1answer
1k views

Will reinstalling bitcoin core give me access to the previous wallet?

If I reinstall Bitcoin Core, will my previous bitcoin wallet still be accessible or will I get a new wallet? The previous wallet backup became corrupted. Will reinstalling give me back my old wallet ...

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