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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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Using bitcoind json-rpc with multiple wallets

Since some time bitcoind can have more wallets, there are commands: https://bitcoincore.org/en/doc/22.0.0/rpc/wallet/loadwallet/ and https://bitcoincore.org/en/doc/22.0.0/rpc/wallet/listwallets/ Does ...
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1 vote
1 answer
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Is there any privacy issue in doing this hard-to-summarize thing with Bitcoin Core?

I have a "hot" wallet.dat with no password, with a small amount of satoshis. Recently, I transferred them all over to my Bisq wallet temporarily to make trades. So the hot wallet.dat has 0 ...
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2 votes
2 answers
158 views

How can a private key be imported to a descriptor wallet?

If the Bitcoin Core Wallet Migration Tool is supposed to be creating descriptors for sparse keys (as it's supposed to support pre deterministic wallets), then why doesn't Bitcoin Core allow using ...
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1 vote
1 answer
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mainnet wallet will refuse to dump privkeys

I created a new wallet in Bitcoin Core v23.x, as expected it created an empty wallet version 169900 descriptors true format sqlite. It seems it created 4 streams of 1000 keys each. Anyway I told it ...
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1 answer
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Pruning Blockchain and creating multi wallets

I am trying to determine if I could use pruning blockchain option on my future bitcoin node or not. I will create a multiple wallets by RPC calls and I need to be able to check the history of ...
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2 votes
1 answer
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bitcoin core : code released after the rescan ! problem in that?

Help, with bitcoin core : AFTER the Rescan : 1 - rescan 2 - response output, on the debug file out: 3 - FlushStateToDisk: write coins cache to disk (coins, kB) completed (s) , OK 4 - Imported mempool ...
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How can I import my private keys in Bitcoin Core v23.0?

I have synchronized the whole blockchain. I have imported my private keys but balance stays on 0.00000000 BTC. I imported my address and now my BTC shows as "watch-only" in overview. How do ...
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1 vote
1 answer
170 views

Can I use the Bitcoin Core CLI to learn the block height at which a transaction was mined?

I am interested in figuring out at what height a transaction was mined, but I cannot find the right command to extract this information. Perhaps it's not possible? My Bitcoin Core was not involved as ...
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Bitcoin core fails to load

I have just loaded the Windows version of Bitcoin Core (v22). But it fails to sync with the network. At around 6 days and 5 hours I see the following: Please note that despite 30 years IT experience, ...
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1 vote
1 answer
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What is maxsigcachesize?

-maxsigcachesize= Limit sum of signature cache and script execution cache sizes to What is this? What is a sigcache? What happens if it is set low and Can it have a bad effect?
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1 vote
1 answer
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How to build a simple Bitcoin Wallet

I am looking for a way to build a Bitcoin wallet native mobile application for iOS & Android. I want the app to offer the following features to its users; Create a new wallet (self custodial) ...
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1 answer
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What Are The Parts Of A Bitcoin Transaction In SegWit Format?

I know that pre-segwit transactions looked like the following (This is the hash of the transaction in block 170 - the 10000 bitcoin pizza exchange): ...
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1 answer
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How long does it take to get bitcoin trough Twitter

My friend @JayeCane , that's his Twitter nickname also, sent me BTC through Twitter at my address : bc1qhl8ajxff5z4zmmsshsnz98m3x7r2lupsuvfjeq before 4 day's ago. I have to wait or something went ...
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3 votes
0 answers
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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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1 vote
1 answer
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What does setting the "-server" flag do?

I'm running the GUI version of Bitcoin Core. But I want to also be able to interact with bitcoin-cli in my Windows console. Apparently I need to set the -server flag before running bitcoin-qt, or set ...
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What Is The Script Signature And PUSHDATA operation? [duplicate]

In bitcoin transactions, there is a part of the transaction known as the scriptsig. What does this mean? Also, what is the ScriptSig (PUSHDATA opcode) operation.
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3 votes
1 answer
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Remove descriptor from a Bitcoin Core wallet

I had accidentally imported descriptors into a wallet that I didn't mean to import to in Bitcoin Core. From what I can tell, the only way I can remove this descriptor from that wallet is to delete the ...
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0 votes
1 answer
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How Is it possible that bitcoin blocks store transaction data in 32-bit SHA256 strings. How would nodes know the transaction?

What i mean is that a traditional bitcoin block has performed 2 SHA256 iterations on the raw hex data of a single transaction. Then it is stored in the block. But since it has been SHA256'd, how can ...
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1 answer
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Does The Bitcoin Network Have A Way To Alert Nodes Of A Network Issue/Bug?

I know that the Bitcoin Network would send an alert message which follows: int32_t nID The alert identification number - this allows nodes to identify double-messages. int64_t nExpiration The alert-...
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2 votes
2 answers
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How do I switch a pruned node to "neutrino mode"?

According to Lightning Lab's documentation, Bitcoin Core can be run in "neutrino mode" to serve block data without storing transactions. I've been running Bitcoin Core in pruning mode and ...
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1 answer
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How does Bitcoin Core know about a new address created in a different wallet?

Using importprvkey, I imported all the private keys of an Electrum wallet into a Bitcoin Core wallet (courtesy the electrum2core script; 🎩-tip: somedude). Then, in Electrum, I created a new bech32 ...
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Do I need to Download the complete Blockchain before BTC will reflect under amount after running importprivkey? Current Version being used is V22

I have done the importprivkey as per instructions. I can see the transactions under the transaction Tab, but I do not see my BTC under overview balance. I do not see the address Tab also as per Wiki ...
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1 vote
1 answer
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How a bitcoin node knows where the last transaction of my wallet is

when i send a transaction to a bitcoin node how can the node know that my address exists and where in the chain my address is? does it do a verification? how does it know that I have the funds knowing ...
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1 answer
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how can I get the fee percentage on buying or selling a specific amount of bitcoin at any time?

so im noob on all of this so bare with me. im trying to test the possible net revenue of a trading algorithm/bot, but i dont trust it enough to test it with real money, so im going to simulate how ...
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1 vote
0 answers
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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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1 vote
1 answer
53 views

Create individual wallet for each user

I am working on a platform where users can register and can have wallets with multiple addresses (one address for each coin/network). I found something in Binance APIs where you're able to create sub-...
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verifying bitcoin core version 22.0 [duplicate]

I'm trying to verify the bitcoin core version 22.0 but when I verified it seems all the signatures are bad (I downloaded SHA256SUMS.asc and SHA256SUMS files from https://bitcoin.org/en/bitcoin-core/).
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1 answer
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GRT address vs BTC address

I was asked to provide my BTC addresss and accidentally provided my GRT address to receive funds, the funds were initiated to send, will this be a problem?
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0 votes
1 answer
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How Is The Genesis Block statically encoded into bitcoin client software?

What does 'statically encoded' even mean?
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-2 votes
0 answers
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Probability of four or more zeros in a hash code [closed]

if you were to enter a single random integer into the nonce field, what would be the probability of generating an output hash code that begins with four or more zeroes?
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1 vote
2 answers
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What stops someone from tampering with node software and hence would be able to disrupt the blockchain?

For example, if someone was running a full node and somehow re-wrote the software so that blocks and transactions which did not abide by Bitcoin's consensus rules would be able to be relayed, what ...
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1 vote
0 answers
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Understanding bitcoin merkle tree construction at code level

I have a high level understanding of how merkle trees are constructed for a Bitcoin block, but I am interested in building a little CLI tool in golang that actually takes a list of transactions for a ...
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0 votes
1 answer
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Peer-to-peer - informations about downloading

I would like to know how the software downloads the blockchain. If the bytes write throught the socket and wait until it's written. And If the software asks 16 blocks to each peer in which you're ...
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3 votes
1 answer
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How to setup signet with bitcoin core locally

I am trying to run a signet network locally using bitcoin core. I have downloaded bitcoin core and upon installation, it seems I have to go through the Initial Block Download process. I am only ...
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3 votes
1 answer
416 views

How do I know if the Bitcoin Core software on my computer is running taproot, segwit or something else?

I would like to check this. I imagine there must be some command to verify the current version of node software Bitcoin I am running ('version' is probably not the correct name here. Maybe 'soft fork' ...
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0 answers
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PHP Blockcypher error validating generated transaction: Error running script for input 0

Attempting to use Blockcypher's /txs/send endpoint using detailed here: https://www.blockcypher.com/dev/bitcoin/#creating-transactions and I'm getting the following error: Error validating generated ...
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1 vote
0 answers
40 views

Solution for P2SH non-standard derivation paths

Creating P2SH (Nested Segwit) addresses from an imported BECH32 (Native Segwit) XPUB, when running Bitcoin Core (pre-2020 software) wallet (as watch-only, with private keys disabled) can lead to non-...
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0 votes
1 answer
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My Bitcoin-QT directories are empty? (Ubuntu)

According to Bitcoin-QT (I am using the snap store version) my Datadir is /home/(username)/snap/bitcoin-core/common/.bitcoin and my Blocksdir is home/(username)/snap/bitcoin-core/common/.bitcoin/...
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0 answers
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Unknown new rules activated (versionbit 1) when running Core v22.0.0 on testnet [duplicate]

I have got "Unknown new rules activated (versionbit 1)". I am running Bitcoin Core v22.0.0 on testnet. This seems to be the last version as of today (April 17 2022). I am running a taproot ...
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3 votes
1 answer
575 views

How is this 0 sat tx even possible? How can I do them?

A Redditor from r/Bitcoin spotted a 0 sat/vB transaction in which the transaction occurred sometime in October last year (presumably by F2Pool). The transaction ID is as follows: ...
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0 votes
0 answers
23 views

Bitcoin Transaction [duplicate]

I was able to find an old BTC wallet address that has BTC on it from an old email. The BTC wallet address has BTC on it. The problem is I do not remember the account I used for that BTC address. How ...
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0 votes
2 answers
45 views

How can I manually connect a bitcoin network and create a bitcoin account?

I am not sure that I'm 100% technically correct, but I want to create a key value pair which is essentially my Bitcoin account. Please correct me if I am wrong. So what does it take me to make my ...
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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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1 vote
0 answers
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How to calculate modulo (%) of bitcoin publick key?

Good day. How to calculate modulo (%) of bitcoin publick key ? Absolutely any methods are welcome, please. Br
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2 votes
0 answers
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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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Newbie, please help, I'm totally clueless about Bitcoin and the rest of them and I need help [duplicate]

I'm a beginner and I'm new to everything about Bitcoin, crypto and everything. Please, I need help,anyone??
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0 answers
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Help me find my wallet [duplicate]

I was in my office and read an article about bitcoin...how at the time it was not worth anything, but it was the way of the future...I thought what the heck and bought $100 and put it in a wallet......
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0 answers
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Bitcoin Core shows 1 year and 21 weeks for synchronization when using an external disk [duplicate]

I am getting 1 years synchronization message: and I am stuck on January 2018 for the whole day. Will it improve, or I have to use a better disk? Is Bitcoin Core unusable with an external disk? Or it ...
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1 answer
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Bitcoin core synchronization too slow, only 16 hours of blockchain in 20 minutes

I have Bitcoin Core stored on my external disk and currently I am on 39%. but the problem is that it is getting slow for some reason. The Bitcoin Core Qt app is constantly beachballing on my Macbook ...
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0 answers
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Connect to ZMQ's tor hidden service

Is it possible to create a hidden service with torrc configured as follows to connect lnd on vps to bitcoind at home? HiddenServiceDir /var/lib/tor/zmq_block/ HiddenServicePort 28332 127.0.0.1:28332 ...
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