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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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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6 votes
0 answers
2k views

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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5 votes
1 answer
2k views

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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5 votes
2 answers
912 views

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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4 votes
0 answers
24 views

upgrading bitcoin core from very old version

Running a full bitcoin node since 2013 but current version is 0.13.1 Can I install version 0.20 directly without going through all the intermediate upgrades?
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4 votes
0 answers
830 views

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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4 votes
0 answers
1k views

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
498 views

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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  • 163
3 votes
0 answers
21 views

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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3 votes
0 answers
92 views

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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  • 135
3 votes
1 answer
117 views

Unable to use `blocks` and `chainstate` from external drive

I want to use data directory from a different location (external SSD) on a Windows machine. When I save the path for it in bitcoin.conf it still uses old data directory. How can I use datadir in ...
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3 votes
0 answers
187 views

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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  • 701
3 votes
1 answer
238 views

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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  • 125
3 votes
0 answers
268 views

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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3 votes
0 answers
62 views

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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  • 31
3 votes
0 answers
322 views

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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3 votes
1 answer
2k views

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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  • 31
3 votes
1 answer
552 views

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 votes
0 answers
27 views

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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  • 113
2 votes
0 answers
43 views

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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  • 21
2 votes
0 answers
117 views

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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  • 21
2 votes
0 answers
286 views

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 votes
0 answers
84 views

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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  • 131
2 votes
0 answers
62 views

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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2 votes
0 answers
351 views

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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2 votes
0 answers
65 views

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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2 votes
0 answers
154 views

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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  • 21
2 votes
1 answer
133 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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  • 135
2 votes
0 answers
96 views

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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2 votes
0 answers
71 views

How to reliably check if your bitcoin onion node is reachable as advertised?

If getpeerinfo returns a good number of outbound onion peers but none show up as inbound:true, how do you check if your node is properly reachable as advertised? Several guides and forum answers ...
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2 votes
0 answers
94 views

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 votes
0 answers
41 views

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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2 votes
0 answers
54 views

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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2 votes
0 answers
57 views

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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2 votes
0 answers
42 views

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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  • 21
2 votes
1 answer
124 views

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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  • 176
2 votes
0 answers
51 views

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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2 votes
0 answers
976 views

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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2 votes
0 answers
114 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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2 votes
0 answers
484 views

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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  • 21
2 votes
2 answers
798 views

RPC call to get unconfirmed balance on a watch only wallet

We have a bitcoin core client running on a production machine. This machine cannot have the private key so each address is added as watch only. So far it has worked perfectly, but recently we need to ...
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2 votes
0 answers
823 views

How to sign bitcoin raw transactions with Python offline

I have a raw bitcoin transaction created using createrawtransaction unsigned_tx = "...
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2 votes
0 answers
26 views

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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2 votes
0 answers
125 views

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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  • 81
2 votes
0 answers
79 views

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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2 votes
0 answers
95 views

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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2 votes
0 answers
127 views

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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  • 7,040
2 votes
0 answers
101 views

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 ...
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2 votes
0 answers
283 views

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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2 votes
0 answers
97 views

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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