Questions tagged [bitcoin-core]
Bitcoin Core is a full node implementation of the Bitcoin protocol with a wallet and GUI. 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". This tag should be used when referring to the Bitcoin Core software.
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questions with no upvoted or accepted answers
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How to recover corrupted Bitcoin-Core blockchain?
I recently experienced a I/O error resulting in data block corruption or index corruption cause bitcoin-qt wasn't quitting so I forced bitcoin core to shutdown without killin it properly. I checked ...
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Format of mkey field in encrypted wallet.dat file
I am writing a C++ application to scour large files (typically disk images) for wallet.dat files, with the intention of recovering the private keys.
At the moment I am struggling the data contained ...
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How to build Bitcoin binaries for Windows on Ubuntu using cross-compile
I am trying to build Bitcoin 0.13 for Windows. I've always used this guide for building previous versions. Now seems that developers have changed their mind regarding Windows, and the new way seems ...
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bitcond and bitcoin-Qt system configuration and bandwidth requirements
What is the best operating system configuration for a computer to run (bitcoind or bitcoin-Qt) and (BFGminer or CGMiner) under Linux, assuming that it will be connected to a 3 Terrahash mining rig on ...
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To sign raw transaction with Segwit Address in the TestNet
I am using Bitcoin core 0.14.1 testnet. I created a Segwit address. transfer some coins to this address. Now I want to spend it. I created a raw transaction using console command i.e. ...
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How to choose between so many open-source bitcoin pool software
I am now in the venture of finding and setting up a bitcoin pool company. However, after some research, I found out that there are plenty of bitcoin pool software. There are:
CoiniumServ
Cryptonote ...
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4
votes
1
answer
548
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How many addresses can Bitcoin Core 0.13 **effectively** manage?
I want to know, what's the maximum amount of addresses that Bitcoin Core 0.13 can manage?
All addresses should belong to the default account.
I want to use the walletnotify feature
How does the ...
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3
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How to gpg verify my bitcoin core download step by step on ubuntu server?
I am a newbie when it comes to setting up a bitcoin node but I am trying to gpg verify my bitcoin core download the pub keys to do so are no longer available. I have tried doing my own research but I ...
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Is it bad practice to run full node with all Bitcoin P2P protocol optional services enabled?
I am running my full node /Satoshi:23.0.0/ with all optional services enabled.
These are: NETWORK, BLOOM, WITNESS, COMPACT_FILTERS, and NETWORK_LIMITED.
My bitcoin.conf file contains following entries:...
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How to install bitcoin-cli on MacOS?
I have installed bitcoin-core with Homebrew on my MacOS, but the only package installed is Bitcoin-Qt. How do I also install bitcoin-cli?
(Just want to play with the commands for learning.)
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How does bitcoin core handle service flag spoofing?
There are 5 service flags in src/protocol.cpp:
static std::string serviceFlagToStr(size_t bit)
{
const uint64_t service_flag = 1ULL << bit;
switch ((ServiceFlags)service_flag) {
case ...
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3
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Problems with multiple wallets on RPC in bitcoin-core
I have been playing around a bit with Bitcoin Core (version 23.0), more specifically connecting to different wallets in Bitcoin Core through RPC in Python. I have found this library and tried to ...
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Compiling bitcoin error : A compiler with support for C++17 language features is required
I am reading the "Mastering bitcoin: Programming the Open Blockchain" book by Andreas Antonopolous. In the chapter about compiling bitcoin, the instructions were to execute first
./autogen....
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Various caches are defined in the Bitcoin source code. What do these caches refer to?
The source code is as follows：
//! -dbcache default (MiB)
static const int64_t nDefaultDbCache = 450;
//! -dbbatchsize default (bytes)
static const int64_t nDefaultDbBatchSize = 16 << 20;
//...
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3
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Is it safe to skip the initial block verification at startup?
The longest step in bitcoin core initialization is "Verifying last 6 blocks at level 3". The number of blocks checked at startup went down from 288 in 2014 to 6 now. Therefore, in order to speedup ...
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How do I calculate transaction fee for call to createpsbt()?
When my user invokes my app, he passes as an input parameter the desired value of the TX fee in satoshis per byte. I create a PSBT by calling createpsbt(). I exert complete control over the ...
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Is it possible to use Bitcoin-core for multisig? Can it handle change addresses?
I have tried to import three xpub in a watch-only wallet as keypool with importmulti and a multisig output descriptor and to fill the first address with some BTCs. When I try to spend the newly ...
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How to segregate wallet from bitcoin core | Run multiple wallets in different servers on one centralized bitcoin node
I am running bitcoin full node in a centralized server. I have many web applications running in various places. I want to connect this web applications with centralized full bitcoin node. How to ...
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How to sign bitcoin raw transactions with Python offline
I have a raw bitcoin transaction created using createrawtransaction
unsigned_tx = "...
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How do bitcoin nodes know their own external IP address?
I'm studying the bitcoin source code and I have a doubt about if: Bitcoin nodes still follow the methods explained at the "Satoshi Client Node Discovery" wiki page?
More specifically, if they follow ...
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How to ignore balance check to cancel unconfirmed transaction (double spending)
I need to cancel a transaction that was sent without fee (using Blockchain.info). It is currently "Unconfirmed". The only way I have found is to do a double spend of the whole wallet, specifying a ...
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1
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Bitcoin Core keeps crashing
I have Bitcoin Core v0.11.0 installed on a machine that's running Windows XP. After waiting several days to completely synchronize, I decided to update the bincoin.conf file. I didn't see one where ...
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What are the weakest cryptographic guarantees in Bitcoin?
I read in this Github pull that Bitcoin relies on weaker cryptographic guarantees than SHA256.
What are the weaker cryptographic guarantees being referred to?
Could it be that RipeMD is 160 bits? ......
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2
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How do I troubleshoot port accessibility to allow inbound connections on MacOS?
I'm wondering if anyone has experienced anything like this. IPv4 ports seem blocked. I have tried everything to open a port on my Mac but the port seems blocked.
It's like the only port that can be ...
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2
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answers
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How to track down OOM?
Since a while LND on m Bitcoin Node is restarting weekly a I get an OOM:
Feb 12 21:07:24 umbrel kernel: node invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0
Feb ...
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2
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0
answers
34
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Difference between pprev and pskip pointers in the CBlockIndex class?
In the Bitcoin Core there is class called CBlockIndex which as its name appears is the implementation of blocks. This class has two variable that for me they looks the same:
class CBlockIndex
{
public:...
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2
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128
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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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2
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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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2
votes
2
answers
395
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RPC port 8332 not accessible after reboot
I have compiled and installed Bitcoin Core for the first time on Debian 11. Everything is up and running except that RPC port 8332 is not accessible after a reboot.
I get the following error running ...
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2
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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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2
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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 ...
- 131
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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 ...
user103136
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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://...
user103136
2
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0
answers
290
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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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2
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0
answers
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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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1
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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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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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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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2
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answers
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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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2
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0
answers
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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
...
user103136
2
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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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answer
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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,"...
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