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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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Parsing bitcoin blockchain, get input (vin)

I downloaded the bitcoin blockchain. I have a full node and I would like to do some parsing. I use RPC to send commands to bitcoin core from my Python program. When I get a block it works fine but the ...
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Bitcoin core imported wallet

I have a friend that has an issue with his core: He generated a wallet with coldcard, imported in bitcoin core.. received on both bech32 addresses and nested ones. Lost access to that pc and now when ...
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How to compile and conduct functional tests of Bitcoin core for CPU (32 bit) and memory constrained system?

I wanted to use my old laptop to run a bitcoin full node. Specifications: Processor: Intel Core2Duo @2.2 GHz i686 OS: Lubuntu 18.04.6 LTS (I have tried first on Lubuntu 16.04, but it failed due to ...
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How to connect Sparrow wallet to Bitcoin Core on a different machine but the same network

I have a Raspiblitz set up on a Pi 4 and am trying to connect Sparrow wallet to Bitcoin Core from another machine on the same network. I have read through the instructions at sparrow.com/docs but ...
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Solved: Need help setting up Bitcoin Core full node over Tor (solely) and Tor hidden service. Tried a bunch

Fetching getnetworkinfo should result in IPv4 and IPv6 flags set to false and Tor to true. This will ensure that I am operating my node privately. But this is not the case for me. This is what I ...
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Transfer Bitcoin Core data into a database

I've downloaded Bitcoin data locally via the Bitcoin Core app install and sync. I'm looking to build a system though which users can query their account balance. I'm thinking of building a simple web ...
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What do I tell my company IT dept so they allow my bitcoin core container to connect to other nodes

I work for a corporation therefore work behind a corporate firewall. I login to their vpn then I access company resources like mails, IMs etc. As a internal team project, I'm trying to setup a btc ...
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Monitor domains used by DNS seeds in Bitcoin Core and Bitcoin Knots

Problem: DNS seeds and security Solution: I want to create a website which does the following: Check 'A' record for all domains used by 9 DNS seeds every 5 minutes Save all IP addresses in local ...
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DNS seeds and security

In the case of website like bitcoin.org some people noticed suspicious things on website and reported. Later Andrew Chow did some analysis and it seems DNS records were changed for the domain: https://...
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Can't open bitcoin-qt GUI on Raspberry Pi

I installed the latest bitcoin node on my Raspberry Pi 4 following this guide: https://www.makeuseof.com/bitcoin-node-raspberry-pi/ Everything went well, only the last step where you need to start the ...
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Add inputs and outputs to a transaction signed with sighash SINGLE | ANYONECANPAY

I created a transaction with one input and one output, and signed it using sighash SINGLE | ANYONECANPAY. Can I add further inputs and outputs with another wallet using bitcoin-cli?
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Major changes to Bitcoin since original paper

Is there a history of the major changes/additions (as well as perhaps major proposals) to Bitcoin since the original paper by Satoshi? I realize of course that one can read through the BIPs and ...
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How to "create new receiving address" from recently installed full node, (0.21.0) with new encrypted wallet?

On March 11th, 2021, I completed my downloaded of the full node from Bitcoin Core, (Bitcoin-0.21.0-win64-setup), on my Intel(R) Core(TM) i7-10700 CPU @ 2.90GHz - 16.0GB, Windows 10Pro. I created a ...
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Why does bitcoin core appear to freeze while connecting to peers on startup?

When I startup bitcoin-qt (version 0.20.1.0) on linux, at the bottom of the app is the mesage "Connecting to peers... 4 years and 10 weeks behind". It appears that things are just frozen, no ...
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How can I use a secondary disk for the blocks folder with the snap install?

I always installed bitcoin from the tar.gz but now tried the snap but it uses a different data folder, so I removed the blocks, chainstate and indexes and replaced them with the same old symlink to my ...
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What possible explanation could there be that Bitcoin Core on Linux Mint claims to but does not save the wallet backups?

Linux Mint. Bitcoin Core 0.21.0. I go to "File" and "Backup wallet", then select any location. I've tried with /home/a and /tmp and others. Every time, Bitcoin Core says that the ...
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Scantxoutset: correct way to pass array in console/debug window?

Ok this is a bit embarrassing but what is the standard way to pass arrays through the bitcoin debug/console window? I've done it before and I thought it just had to do with placement of quotes, but I'...
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Linking libsecp256k1 as shared library to Bitcoin Core

I'm not sure if this question is better suited in the context of Autotools, but since it's about Bitcoin Core, I'll try to ask it here. I am trying to Compile/Link libsecp256k1 as a shared library ...
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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 ...
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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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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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Where can I find the core binaries for v.0.1.5 to v.0.3.21?

I have been looking for core binaries (i.e. win32-setup.exe & win32.zip & macosx.zip) for earlier clients. Any advice on where they are hosted? They have all been removed from SourceForge. ...
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Does the mempool size as reported by Blockchain.com include the size of txs only?

Does the mempool size as reported by (for instance Blockchain.com) include the sum of the 'size' of transactions only? Or does it also include the overhead (due to indexes, allocation overhead, ...
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How to build coinbase transaction from bitcoin core?

I am coding a program that connects to bitcoin-qt as local server. For building the blockheader i need the merkleroot, to build the merkle root, i need the coinbase transaction (which is not provided ...
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How many times has the dust limit and minRelayTxFee changed?

I understand that there's no minimum tx fee or minimum tx output amount in the consensus rules. However, the default minimum values for a transaction to be considered 'Standard' in Bitcoin Core have ...
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Intermittent error "min relay fee not met" even with decent fee and custom Electrumx+Bitcoind

I have an automated system that sends BTC payments via Electrum for a client. Now, it happens again and again that payments keep failing with "min relay fee not met" (RPC call failed: {"code":-32603,"...
CherryDT's user avatar
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171 views

what is fee_estimates.dat data format?

I'm trying to parse the file fee_estimates.dat. What is the format of the binary data inside fee_estimates.dat ? I didn't find any information about it in the dev documentation of Bitcoin. This is ...
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Bitcoin Core Blockchain Sync Fatal Internal Error - Corrupt Block - Linux

I'm trying to perform the IBD on Bitcoin Core 0.18 and I continually receive "Fatal Internal Error" at seemingly random intervals, closing bitcoin-qt and preventing me from fully syncing. Farthest I'...
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how does PACKAGE_NAME defined and used in bitcoin source code?

In bitcoin source, I found a variable named PACKAGE_NAME, how does it works?
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Does bitcoin dust fee rule or policy activate in bitcoin testnet?

Does dust fee rule activate in bitcoin testnet? I create a tx in testnet with output is dust,the tx always relayed and go into block, but in main net it report dust transaction error. Why bitcoin ...
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How to get multiple connections to the same node

I'm playing around with connecting my node to another one of my nodes to see how many incoming connections I can handle. Whenever I add node A from node B with bitcoin-cli addnode 1.1.1.1 add after ...
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Does Bitcoin Core v0.17.0 run on native wayland?

I'm trying to run bitcoin core v0.17.0 on Wayland on Fedora 29. When I run bitcoin-qt I receive Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland ...
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Why does a node get stuck in "Loading wallet..."

I've deleted wallet related things from .bitcoin folder including: .bitcoin/wallets and .bitcoin/chainstate and run bitcoin using bitcoind -reindex. This takes longer than just starting over from ...
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Even with dbcache=7000 and 16 core processor. Why does -reindex-chainstate take more than 24+ hours?

My computer got shut off due to a power outage and when I rebooted my bitcoin core it was stuck on connecting to peers. I was told to do a -reindex-chainstate with dbcache set as high as possible. ...
Patoshi パトシ's user avatar
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814 views

Unable to get balance with bitcore lib

Using latest version of bitcore lib , want to check balance for making tx but once I include var explorers =require('bitcore-explorers'); after var bitcore =require('bitcore-lib'); Error: More ...
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Post SegWit Inclusion, how long until Lightning Network is included in the core?

Introduction - Reason for asking this question With most of the money in the cryptocurrency domain still being utilized in transactions on crypto-exchanges and the numerous hacks that have previously ...
Junaid Shaikh's user avatar
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Why does the feature_block.py bitcoin functional test fail in tagged release 0.16.0?

I tried running the unit and functional tests from the latest tagged release (0.16.0) from https://github.com/bitcoin/bitcoin.git. To my surprise, there is one functional test that persistently fails ...
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Stateless vs Stateful wallets

Stateless wallet are wallets that do not store any information locally on the device. Stateful wallets are wallets that store information such as index of unused address. According to my ...
Infinity's user avatar
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Upgrade from Bitcoin QT 0.8.5 to latest Bitcoin Core 0.15.X

I bought and transacted BTC in 2013/2014. I had a Bitcoin QT 0.8.5 wallet. I plugged it in and it updated correctly to the latest block. It correctly showed my BTC balance. I made a transaction ...
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What is the alternative of Bitcoin-RPC-Client?

I am implementing Bitcoin-RPC-Client for web application but I found bitcoin-RPC-client is better than bitcoinj and what are the advantages and disadvanatges of Bitcoin-RPC-client.
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Abandon Transaction or Increase fee

I'm using Bitcoin core v0.15.1 and I am trying to send my BTC to coinbase. I have waited over 72 hours since initiating a transaction and when I right click the "abandon transaction" and "Increase fee"...
Stevie O's user avatar
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1 answer
1k views

Trying to open an old bitcoin core wallet.dat file fails

I am trying to open an old (~2012) bitcoin core wallet.dat with a bitcoin.com wallet, and it says that my password is incorrect, although it works great on my bitcoin core wallet. Was there any ...
Lior Lower's user avatar
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547 views

How to delete last n blocks / roll back to specific block number in Bitcoin Core? (Like `monero-blockchain-import --pop-blocks n`)

I have Bitcoin Core's bitcoind running and synced in a VM. Now I want to clone the VM and run one of the various hard forks (such as Bitcoin Cash) in the clone. The plan is to roll back my copy of the ...
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Share pre-fork blockchain between Bitcoin and Bitcoin Cash

I run full-node of Bitcoin on Bitcoin Core software. Now I want to also run full-node of Bitcoin Cash. I googled around and found three softwares which support Bitcoin Cash: Bitcoin ABC, Bitcoin ...
Denis's user avatar
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Can't connect to Bitcoind remotely

I am running a Bitcoin Cash node on my server, and starting it like this: start bitcoind.exe --server=1 --rpcuser=user --rpcpassword=password --rest=1 --rpcport=8332 --datadir=F:\Bitcoin --bind=10.1....
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What is the smallest ubuntu virtualbox image to run cryptocurrency software on?

I'm looking to do all my crypto related stuff like storing coins and managing my coin wallets inside a virtualbox. I plan to use ubuntu as it seems most friendly with many crypto coins. What is the ...
Patoshi パトシ's user avatar
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202 views

Clarification of some getaddr() function inputs and outputs

In the Bitcoin system to discover new nodes, each node communicates with its peers by sending getaddr() to the peers. Based on the bitcoin implementation: //! the maximum percentage of nodes to ...
user1111's user avatar
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436 views

I have bitcoin in an armory wallet - how do I get the Bitcoin Cash

I have an amount on bitcoin in an armory wallet from a year ago, and have never moved the coins. How do I get the bitcoin cash coins from this? Can I just install the bitcoin cash client and ...
Scott Binkley's user avatar
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121 views

Is the reference client of Bitcoin regularly audited?

I imagine that plenty of eyes have combed through the reference client's source code. But the code is still changing for a variety of reasons (features, patches, improvements, etc). I didn't find ...
Daniel's user avatar
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What is preventing segregated witness from being activated

Segregated witness has been around since 2015 with good publicity and proponents since early 2016. It seems to have the benefits of solving transaction malleability, creating a good foundation for the ...
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