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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23 views

Crypto exchange

I just downloaded an app that forecast the crypto market. The app seems to be nice but i dont understand the forecast interface. Please what does this mean? BTCUSD SELL, LTCBTC SELL Does it mean ...
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How to get the time when a block is received at a node?

Is there any variable in the bitcoind code that records the timestamp when a block is received for the first time by a particular node? To be more precise, for transactions, transaction information ...
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How to best practice restoring a wallet in bitcoin core

I have a test wallet in bitcoin core that I want to play around with and get comfortable with before I move my btc from blockstream green wallet. I primarily use that wallet because so far it has been ...
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1answer
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Where is the block reward system coded in Bitcoin core?

I'm taking a look at Bitcoin core and am looking for where the TX is effectively "generated" and send out to an address. I've found the nSubsidy block reward, but I'm currently looking for where the ...
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Online BTC wallet implemention with bitcoin-core

I have written a php code to register users and create wallet for them on bitcoin-core full node.My question is how can i manage users wallets.if i use loadwallet to load USER A wallet and get address ...
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Can I mine bitcoin with this PC? [duplicate]

Pc specs: Intel Core i7 9700k - 3.6 ghz (overclock up to 4.9 ghz) cores 8 threads 8 Rtx 2060 super gaming 8gb 32gb ram 2666mhz Please answer.
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1answer
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Why do my 'sign message' not work on Bitcoin core

If I choose a freshly generated address in Core, and I then choose to sign a message with it, it returns the error message "The entered address does not refer to a key". Why is this? There should ...
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Pruning Blockstore has been running for days

After activating the core (Testnet - Pruned) with the command bitcoin-qt i received the following error: Corrupt Block Database I restarted the synchronization always using the Pruned mode. The core ...
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bitcoin block time after halving?

I would like to know why the bitcoin block time is taking longer than 10 minutes, I know that bitcoin halving had decrease reward and increase difficulty but according what I read the blockchain ...
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Bitcoin Core make

Whenever I try to recompile my changed files in Bitcoin core. I have to run make clean and then make or else it wont compile the changed files. It just goes back to the last compiled file. How do i do ...
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Can edit mining node pool transactions list?

if I have a mining node that is attached to a bitcoin mining pool, can edit the order of the transactions sent by the pool to be mined by my node, and edit it, and even add manually transactions to ...
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What are the advantages for an user that is running a Bitcoin full node?

I am running a Bitcoin full node Bitcoin core version v0.19.1 (64-bit). I know that is one of the most secure wallets, but the process to set up a full node is very painful, and even if you keep ...
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segwit compatilibity bc1 and 3 bitcoin wallet?

I would like to know what's the better aproach for upgrading from a legacy address to a segwit one, but there are two type of segwit as P2SH starting with 3 and Native SegWit (bech32) starting with ...
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number of inputs or outputs affect bitcoin transaction fee?

I would like to know how inputs and outputs affects my bitcoin transaction fee using legacy address, and how using a segwit address will decrease the same transaction? and how they will be ...
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can I have a mining node and only accept a transaction for an ip? [closed]

I would like to have mining node to mine bitcoin transactions but I want only do it for a specify ip, can do that ? or it's better to have a mining node and join it to a mining pool and and make it ...
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1answer
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can sign derived wallet transactions with master seed phrase private key? [duplicate]

I would like to sign a transaction from a wallet which is derived from a seed, and sign it with master seed private key, can I sign any tx of any derived wallet address after the master seed wallet? ...
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1answer
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Unable to make custom Bitcoin command

I'm writing a thesis on Bitcoin system and as a part of my assignment i have to explore Bitcoin-core source code. I 've downloaded the code, compiled it and manage to run it. However, I wanted to ...
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1answer
25 views

Is the index db downloaded from peers or generated locally?

When the user start the Bitcoin client for the first time, it will download the whole blockchain. But what about the block index (blkindex.dat in older versions) ? Is it downloaded from peers just ...
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Where can I find the complete guide how to automate bitcoin deposit and withdrawal just like exchanges does? [closed]

I would like to integrate BTC auto-deposit and withdrawal on my site, I want a complete guide how to do it so that I can build it myself. P.S: I am not a software programmer or developer.
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2answers
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Can an unsynchronized node create a valid transaction?

I'm trying to understand how bitcoin transactions work. From what I understand, in the Bitcoin network nodes hold different versions of the Blockchain and after some time the different chains start ...
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Corrupt block database

I activated the core with bitcoin-qt as I always do. What can be the cause of the database loss? Synchronization is restarted from the genesis block. I use the testnet with Pruned mode activated.
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How to buy LTC or ETH in Low rate any idea? [closed]

Please help i want to buy LTC and ETH at low rate any site for suggestion
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The general principle of smart contracts for bitcoin

As far as I know, there is the possibility of realizing smart contracts using the Bitcoin blockchain. Explain how a smart contract works on the Bitcoin blockchain. I am interested in the general ...
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1answer
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How do I connect to the Electrs index?

Goal: My goal is to be able to have my own local blockchain indexed so I can perform searches based on public keys. Blockchain: wget https://bitcoincore.org/bin/bitcoin-core-0.19.1/bitcoin-0.19.1-...
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Why do most HD wallets require choosing either all Segwit or all Legacy but Bitcoin Core can support both simultaneously?

Electrum and the mobile wallets I've used can only support one type of address per HD wallet, but Bitcoin Core can support both at the same time. Is that simply a choice that Bitcoin Core made or is ...
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bitcore features [closed]

I want to connect to various networks through bitcore and gather information including address balance and address transactions. I also want to send transactions to the networks. First, I need to ...
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Bitcoin COT fee

I have recently tried Bitcoin through someone I met, I was told I could turn £100 in to £700 in a week. I tried this, then I got told I had to put more money in etc etc. I now have apparently $14,500 ...
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How to configure bitcore with btc & bch nodes?

I've been looking for a library to directly get balances for specified btc & bch addresses and I found bitcore doing this job. Here are my questions: 1- Is it possible to use bitcore without need ...
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1answer
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How to import address with private key using importmulti

Problem. importmulti function has a lot of parameters and they are more difficult to understanding then the parameters of another Bitcoin RPC-API functions. Those who are not profi in modern ...
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1answer
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Why is a minRelayTxFee of 1000 sat/kb not equivalent to 250 sat/kw?

Naively, we would expect a minRelayTxFee of 1000 sat/kb to correspond to 250 sat/kw. However, apparently this is not so according to this issue (ACINQ), which also references this issue (c-lightning). ...
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1answer
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Is there any method to extract transactions for an bitcoin address which is not in my wallet using bitcoin core?

I have setup Bitcoin core and trying build an API to fetch all transactions under an address ( not in my wallet ). Bitcoin core RPC documention says that an address which is not in my wallet needs to ...
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1answer
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listunspent rpc/cli command doesn't seem to list unspent unconfirmed transactions for watch-only addresses

I am unable to list unspent unconfirmed transactions for watch-only addresses. Once the transaction gets at least 1 confirmation it gets included in the returned result. This is the command I am ...
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1answer
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Get balance for an array of addresses with bitcoin core

I am searching for a command to get balance for imported addresses in bitcoin (not my wallet addresses) and I don't wanna do this with blockchain explorer API's. Is it possible to do this through ...
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1answer
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What if periodic redistribution of bitcoin had been built in the protocol/wallets?

Imagine if there was a Bitcoin-like currency that had periodic wealth redistribution built in the protocol. For example, every month you and every other wallet would pay 20% of their bitcoin evenly to ...
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bitcoin-core/packaging (SNAP version) BACKUP

When I introduce this sentence: bitcoin-core.cli backupwallet wallet.backup it appears the following error: error code: -4 error message: Error: Wallet backup failed! why? When I try to make a ...
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Unspent bitcoin transaction

So about two weeks ago i sent bitcoin to a friend, and it was confirmed but in the summary it was listed unspent, he claimed not to have received. I was really confused since then, now this morning i ...
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2answers
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Problem with data redundancy in block chain

Since the copy of same data is storedon each node in network. Does it use storage space to store same data on each node? If yes then how the data is decentralised. It is just a large network of ...
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2answers
42 views

Unable to start bitcoind

ORIGINAL QUESTION: Anyone know why I am getting the following error message? Other possible relevant info: Config file location /home/.bitcoin/bitcoin.conf Config file content: server=1 testnet=...
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2answers
224 views

Why raw Bitcoin transaction are in hex format?

Why are Bitcoin raw transactions in hexadecimal format? I am looking for scientific articles / books on this topic and I can't find anything, so my question is: why are they in hexadecimal and can ...
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desktop btc wallet “bitcoin core” incorrectly shows the amount of my balance

I have "bitcoin core" win 10 - 64 installed. I haven’t opened my wallet for a long time and haven’t synchronized it. Once again I opened the wallet, the wallet synchronized with the network and I ...
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1answer
26 views

Bitcoin core - creating transaction from UI without broadcasting it

I would like to use Bitcoin core's wallet UI to create a transaction but instead of broadcasting it I would like to get the underlying raw transaction. Is there a way to do that? I assume that ...
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1answer
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Bitcoin core 0.19.1 RPC, 'sendtoaddress' not working!

Suppose this scenario: There are 2 wallets called wallet1 and wallet1 on the same node in testnet blockchain. wallet1 balance: 0.001 BTC wallet2 balance: 0 BTC I am trying to send 0.001 ...
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How do I Transfer Bitcoins If I have a watch-only account with the Private Key

How do I transfer bitcoins over from a watch only electrum account if I have the private key and its address?
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1answer
153 views

Where is the change from the output stored in?

I'm learning that Bitcoin doesn't have a way to represent the account balance, but it's, rather, a sum of UTXO owned by the users of the private key. Then where is the change from the output stored? ...
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Modify the number of confirmations for an utxo to be ```safe == true``` in Bitcoin Core

I noticed that when I call listunspent on Bitcoin Core, UTXO with 0 confirmation are labeled unsafe, and thus prevented from being spent with sendtoaddress or fundrawtransaction. As soon as there's ...
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1answer
38 views

Bitcoin Core 0.19.1 RPC “Move” command

I want to move some coins from a wallet to an other, so I found move command which is supported in Bitcoin Core 0.17.0 RPC but not in 0.19.1. Is any other command has been added instead of move?
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In Bitcoin source code, where is the mining algorithm located?

How do I locate the files that contain the parameters of the algorithm used by Bitcoin? What steps are necessary if I wanted to experiment a change. and implement a different algo?
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1answer
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The difference between mempool “bytes” and “usage”

getmempoolinfo returns bytes and usage. Currently, the value I have for bytes is 1316363 and the value I have for usage is 4826112. I'm assuming that bytes is how much space these transactions would ...
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1answer
34 views

Send bitcoin with bitcoin core without syncing to network

I want to use bitcoin-core just for sending bitcoin from my address to another destination address. i don't need the huge history information of blockchain. In fact, I want to run a light-weight ...
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1answer
32 views

How to getheaders from blockchain?

I have run a full node on linux now I can run commands with bitcoin-cli like: bitcoin-cli getbestblockhash it returns: 0000000000344240308f54ded700542571b3df9efe05fab92e669099e20e0d92 or bitcoin-...

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