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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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62 views

Any method to check balance of particular address in bitcoin core (0.18) using json rpc?

Setup bitcoin core (0.18) in my local node.In new version maximum methods are deprecated.I create new address using json rpc method and send some coin s on it.Now I am unable to check the balance of ...
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1answer
44 views

Where can I download bitcoin core version 0.16.0

I changed my passphrase around march 2018 and now I can't use my new passphrase on the new bitcoin core version. When I put the back up wallet.dat into the new versions of bitcoin core, it tells ...
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31 views

Bitcoin Module - Hash512-EVP_ByteToToken

Is there any standalone software modules created which allow the user to complete the following: 1. Enter in passphrase 2. Enter a given salt 3. Enter the number of rounds I am looking ...
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1answer
119 views

nLockTime in Bitcoin Core

Currently, the Bitcoin Wiki states: A part of the original Bitcoin implementation, nLockTime is a field that specifies the earliest time a transaction may be added to a valid block. A later Bitcoin ...
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17 views

Why is systemd service file not using my config and why is it failing in general?

When I start simply with bitcoind and stop with bitcoin-cli stop everything works fine. But if I start bitcoind with sudo systemctl start bitcoind and I made this /etc/systemd/system/bitcoind.service:...
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2answers
56 views

How to reduce Bitcoin loaded wallet memory?

The server has 2GB of RAM memory. It takes up a lot of memory when I create or load a wallet. When I create about 50 wallets, the server is very slow because the memory is full. Is there a way to ...
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28 views

Bitcoin Core gives error “Error reading from database, shutting down” during first time setup

I have recently installed Bitcoin Core on my Gentoo system via portage. During the first time setup, the initial download stopped at roughly 30% completion and gave the error "Error reading from ...
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25 views

Bitcoin SPV not able to fetch transactions

I am developing a Bitcoin wallet SPV and using 3rd party SDK for the same. However, I tried to create wallet and it gets successfully created and I can also restore those wallets but amount and ...
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26 views

Why does bitcoin-core wallet generate a new wallet during transaction? [duplicate]

I wonder why bitcoin-core wallet automatically generated a new wallet address during transactions. If you see this transaction, https://btc.com/...
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1answer
83 views

How do I export an xpub from Bitcoin Core for use in BTCPayServer?

I'm using Bitcoin Core 0.17, and using bitcoin-cli getaddressinfo method to extract xpub for a given address. This xpub is 66 characters long, and I'm using BTCPayServer which needs this xpub and I'...
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1answer
39 views

Bitcoin deposit function suddenly stopped working

My app uses a cron blocknotify-update-deposit to search for incoming deposits, users deposit funds and they are then added to their balances. I have not used my app for around six months and I have ...
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1answer
23 views

What is a mechanism of providing Merkle Path?

In the Bitcoin, SPV node can query that its transaction is included specific block to full node that provides merkle path which has super fast calculation. In terms of full nodes, they have full-...
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17 views

How to build most basic bitcoin-qt from source?

When testing and fiddling with different settings for bitcoin-qt, I have to build bitcoin-qt from scratch from time to time. I am using Ubuntu. Since this is time consuming, I'm wondering what kind of ...
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1answer
21 views

QR code life span

Once the QR code is generated, how long is the code good for 24 hours, 48 hours? I googled for the answer with no success. Thank you
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1answer
30 views

Deduct transaction fee always from 1 receiver address if sending some BTC amount to 2 different receiver addresses in single transaction

Need help!! anyone there.. How to Deduct transaction fee always from 1 receiver address if sending some BTC amount to 2 different receiver addresses in single transaction
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1answer
19 views

How to re-connect to `bitcoind -printtoconsole` after socket timeout?

I started bitcoind with the option -printtoconsole to check for errors and my terminal ssh connection was timed out during the night - probably because my computer was in hibernation. I see that the ...
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2answers
35 views

What role has bitcoin-init as a process?

I have set up a node on a RaspberryPi. When I check for active processes with top I see bitcoin-init occupying 50% of memory and 7% of CPU. I can check for bitcoind and it is active: bitcoin@...
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3answers
56 views

Ironically, encryption is not an important part of bitcoin (?)

The above statement is taken out of a book which I've been reading: Mastering Bitcoin 2nd Edition. ...as its communications and transaction data are not encrypted and do not need to be encrypted ...
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32 views

Do I need to download whole blockchain?

Im using bitcoin core debian linux to process payments on my shop using RPC API calls. Now im switching wallet server, do I need to download whole block chain in order to process transactions on my ...
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1answer
26 views

Send or receive bitcoins with bitcoin-cli without downloading full blockchain

I have successfully downloaded, compiled and installed bitcoin-cli from github. I can send or receive bitcoins with sendtoaddress and getnewaddress methods. It works great and i am happy to do that ...
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35 views

Creating a “listunspent” API call using MongoDB

I used a tutorial online to create my own block explorer (https://www.youtube.com/watch?v=laeV2slJgc8). In this tutorial, I used "Iquidus" to create the block explorer, which uses MongoDB and Node....
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1answer
147 views

How to send bitcoin from an offline Bitcoin Core that doesn't have a synced balance?

I am setting up a cold wallet. How can I generate a signed raw transaction from bitcoin core wallet that controls some bitcoins? PS: I generated the wallet using getnewaddress in console from the ...
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23 views

What are the ways of receiving transactions list via Bitcoin address?

My team challenges an issue. Trying to support Bitcoin wallets in a messenger app and staying user-friendly, we need transaction lists to be receivable quick and nice. So users would not die waiting. ...
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1answer
45 views

Why doesn't the Bitcoin-qt client ask for the Wallet passphrase upon startup?

I've just encrypted my wallet.dat file using the "Settings -> Encrypt Wallet" menu option. I then closed the client and re-opened it. I was expecting to be prompted to put in the wallet password ...
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1answer
13 views

Loading seed coins in test mode

I'm setting up a regtest node on my Windows machine using bitcoin-qt. Here's my config: regtest=1 txindex=1 server=1 [test] rpcport=8332 rpcuser=ulu rpcpassword=*** Next, I would like to run a ...
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1answer
48 views

bitcoincore additional questions

Following up from my previous question, I still have some questions left. Does it really work if I turn off the internet before doing getnewaddress? Will it really give me something real and can get ...
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1answer
28 views

Should we wait 10 minutes to confirm a transaction [duplicate]

I have read this proof of work calculation takes about 10 minutes. That mean people who are making the transaction should wait 10 minutes ? Let's imagine i want to buy a drink with bitcoin. The ...
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1answer
70 views

bitcoind and bitcoin-cli and bitcoin-qt

following the hackernoon for full node btc, https://hackernoon.com/a-complete-beginners-guide-to-installing-a-bitcoin-full-node-on-linux-2018-edition-cb8e384479ea i have some small questions, is there'...
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19 views

MacOS: How to run Bitcoin Core GUI after building from source?

I built Bitcoin Core from source by following this guide: https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md And got it running on the command line via: ./src/bitcoind Screenshots from ...
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1answer
26 views

bitcoin node startup daemon with created wallet

When I restart the Bitcoin node, I would like to load the wallet I created in the "wallets" subdirectory. bitcoin-cli createwallet "1" bitcoin-cli listwallets -> result : "", "1" bitcoin-cli -testnet ...
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1answer
23 views

How run c-lightning with the local node bitcoin

I have a bitcoin-core-18.0 with on my linux mint, and I don't have downloaded the bitcoin with the ppa but I downloaded the official zip directory on site bitcoin. Now my question is, c-lightning ...
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24 views

Bitcoin Core Question, Initialization Vector

I am reviewing Bitcoin Core source code. I am following the code which states take a double sha 256 of the public key to get the IV and use the master key for the encryption key for encrypted wallet....
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42 views

Checking my bitcoin wallet after two years I find that my bitcoin (0.5 bitcoin) is gone [duplicate]

After checking my bitcoin account after two years, 0.00010757 of a bitcoin remains even though I explicitly remember having half a bitcoin left. My first thought someone somehow stole it. But after ...
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1answer
39 views

Which parameters in the Bitcoin Core config file need to be set correctly prior to IBD?

The majority of the parameters in the Bitcoin Core config file can be changed during or after IBD (Initial Blockchain Download) with no complications. However, there are some parameters in the config ...
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2answers
30 views

Transaction from bitcoin core is different from the explorer

In tx 3a4a7087d4ece4503948b33aa77c807cda770575d229cbcb7dd8336ffa77445a the unique input is 1387e35f2c65f6664e15a98a43b7a70831e636635876a7154c99f38d89a9f795 with index vout = 1. When I request this tx ...
4
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1answer
327 views

Syncing bitcoin node with multiple cores

I'm syncing my node on 32 CPUs, and it's super slow. Obviously, syncing doesn't go in parallel. I wonder if there is any fundamental obstacle for "divide and conquer" way of doing it. So let's say ...
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1answer
51 views

How do block explorer sites show information that is not available on Bitcoin Core?

As I understood in the following post How to get unspents for a specified bitcoin address?, we should use listunspent only on addresses that belong to our own wallet otherwise will return blank. But ...
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33 views

Cannot compile Bitcoin and dependencies. Raspberry pi 4

I'm trying to compile Bitcoin and its dependencies on a Pi 4. The process: - git clone the repo on an external SSD I mounted (path /mnt/ssd/sources/) git clone https://github.com/bitcoin/bitcoin.git ...
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23 views

find bitcoin wallet owner [duplicate]

I received a black mail threat that a hacker would post all account access information of my accounts (bank & email information) online and on all social networking sites if I didn't pay $5,000 of ...
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1answer
44 views

Can't decrypt bitcoin core wallet, did I made a backup at the wrong time?

I am confused on why my bitcoin core wallet password would not work. I am 90% sure I tried the right password(s). wallet has many receiving addresses (10 000), I generated them with Linux from ...
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20 views

Curiosity on P2PKH and P2PK [duplicate]

I have some question on the P2PKH and P2PK they are two methods for locking the output, is a correct definition? Why the P2Pkh was introduced inside the bitcoin? Also, the P2PKH is identified with the ...
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1answer
46 views

Error after reindex

Hello after I got an db error.. I try to reindex my db. But I got this error: ERROR: ReadBlockFromDisk: Errors in block header at FlatFilePos(nFile=75, nPos=117947311) So what can I do to fix it ? ...
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1answer
21 views

How used the getrawtransaction for fin the tx blockchain

How used the getrawtransaction to find the tx blockchain? inside the documentation says to use the -txindex, can you give me an example for the complete command please?
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0answers
26 views

Unknown command name and packet magic for bitcoin packets at the start of blockchain transactions

Recently I captured a part of blockchain when my bitcoin wallet started to syncing for the first time. I analyze about 10 Gb of traffic which was for primary transactions of bitcoin. wireshark can ...
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1answer
30 views

What does the scriptSing contain when it is decoded with RPC framework?

I'm trying to get the wallet id from scriptSing and ScriptPubKey. When I decode the scriptSig, the result does not contain the address address. But when I decode the scriptPubKey, it contains the ...
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1answer
32 views

Correct way to use joinpsbt for manual coinjoin?

I am developing a feature in my app for "manual coinjoins" which follows this as inspiration: https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki#Manual_CoinJoin_Workflow I am not an ...
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1answer
44 views

Coin selection algorithm

Playing around with Bitcoin Core Client v0.18.0, I used this command: $ bitcoin-cli sendtoaddress "mozazucvLK179u41bF5Vd2Agp4wsm7HsPo" 0.1 which created this transaction. I noticed that the ...
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0answers
21 views

Javascript REST API to connect the local bitcoin node

Is there any javascript API available to connect the local bitcoin node(regtest) for sending the transaction to the network(regtest)?
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1answer
92 views

How can I turn off sending of bitcoins?

I use Bitcoin Core v.0.17 on the server. I want to only be able to receive, and prevent sending. How can I turn off sending of bitcoins through bitcoind, bitcoin-cli or bitcoin.conf?
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2answers
49 views

Including transactions in a block - rules and time / technical aspect

I’ve a question regarding block and transactions included in the next block that is solved. Let us assume theoretically that there is newly propagated solved block. And now there are: tx0 and tx1 –...