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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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11 views

Configure esplora to point to the bitcoind servers ip address

I have 2 servers running: Ubuntu 18.04 running bitcoind daemon (v0.18.1 full blockchain synchronized) Ubuntu 18.04 running esplora (the local single page website works, but it has no data from the ...
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12 views

problems with unconfirmed transaction of BTC deposits from wallet to wallet with fees paid in advance

i have just started using a BTC wallet called Luno but have 2 unconfirmed transactions still pending while only the 1 transaction went through. 1st transaction was a test with a small amount being ...
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2answers
24 views

Blockchain Explorer for local full node

I would like to build my own blockchain explorer because I have found that using the API's of 3rd party blockchain explorers only gives me around 2 or 3 requests per second. Does an open source ...
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0answers
20 views

BCH to paxful pls help [on hold]

If can anyone tell me how I can recover my BCH I mistakenly sent to paxful wallet address though I'm still seeing unspent on my BCH wallet I'm so confused pls help
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1answer
15 views

Bitcoin 51% majority miner attack - question on the role of user activated soft forks as defense tactic

If one mining entity has alone 52% hash power of the overall network, then this party can block transactions for example and try to "build" up a forked, longer chain while time passes, right?. As I ...
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1answer
17 views

Bitcoin Orphan blocks - short question about the “time lag” factor and proof-of-work “size”

"However, it is possible that two miners produce a block at a similar time. This situation occurs because the acceptance of the blocks into the blockchain by the nodes of the blockchain network ...
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1answer
32 views

lightning network bitcoin howto install

Hello fellow bitcoiners, I would like to install lightning over Bitcoin core - I already have a full node. But every guide I follow ends up with a broken build or some issue preventing to finish the ...
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1answer
18 views

I get invalid argument error when running bitcoin-cli -getnetworkinfo, and a few other parameters

So I have bitcoind -daemon running and it appears to be generating the blockchain. keeps saying Potential stale tip detected, will try using extra outbound peer... The issue is I run bitcoin-cli ...
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1answer
34 views

Why I'm getting different merkleroot?

I'm using merkle.cpp code (which uses the libbitcoin library for some helper functions) from Mastering Bitcoin book. I was trying to re-create Merkleroot hash for Bitcoin block #100000 containing 4 ...
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1answer
21 views

Please take a look at my server print out to see if all looks well or if the repeating errors mean something is wrong

So it is not clear to me if my bitcoin server is syncing and all is fine or if the "potential stale tip detected, will retry extra outbound " message means I have to do something. Searching for that ...
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1answer
16 views

Is it possible to catch up missing blocks with zeroMQ if script was down for a while?

I use zeroMQ to get all new blocks (rawblock or hashblock). If my script is down for few minutes or hours and I missed few blocks, is it possible to catch up all missed blocks with zeroMQ when I ...
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3answers
32 views

How bitcoin application in production retrive UTXO's

AFIK, UTXO of an address cannot be retrieved using bitcoin-core, without importing the address in the wallet. How are application in production able to get UTXO ? Does all the application use ...
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1answer
28 views

What stopping miner from altering value in transaction to increase transaction fee?

I'm learning bitcoin through this book "Mastering Bitcoin, 2nd Edition by Andreas M. Antonopoulos". I'm at Chapter 6 "Transactions". Here is my doubt: Example there is node A, received transaction ...
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2answers
24 views

Difference between block hash and transaction hash in bitcoin-core

Is there a logic based on which one can determine if a given 32-bit hash corresponds to a transaction or a block without enquiring a bitcoin-client? In other words, how do I differentiate or ...
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1answer
31 views

If a court orders mining pools to seize funds, they will modify their software to do it, or be shut down' - can this happen?

I thought nodes could prevent this too. but if enough miners did do this, what could happen in worst case? thanks in advance for responding
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28 views

if bitcoin miner(s) changed the UTXO set would the bitcoin nodes reject the blocks?

if so, would this cause a Fork? or what would happen?
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1answer
33 views

does bitcoin-core support bip44 HD wallet

If bitcoin-core does not support bip-44, is there any other node ?
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34 views

does bitcoin core 0.18 support bip44,bip39 (HD wallet) [closed]

I am new to bitcoin. Struggling to implement HD wallet. goggled for the same but did not get satisfied answer. Can we create multiple seed in single bitcoin core server? If yes, then how we can ...
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17 views

Types of onion address

I'm running a bitcoin core full node with Tor and I've configured a hidden service for that. The point is: bitcoin core log shows me an onion address which is very smaller than the one I found in /var/...
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1answer
17 views

difference between inbound and outbound connection

I'm running a bitcoin full node (bitcoin core) via Tor. I noticed I have only outbound connections (using maxconnections=16 in the conf file), but not even an inbound one. So which is exactly the ...
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39 views

Extract ECDSA parameters from Bitcoin Blockchain Block

I am trying to extract the parameters of ECDSA signature used in bitcoin to run some tests. For that i need to obtain : --- r and s , i.e., the ECDSA signature --- H(m) , the hash of ...
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1answer
17 views

Is it possible to use Bitcoin Core Qt as interface for DIFFERENT full node?

bitcoind is running on the background, local RPC server is running, all good. But is it now possible to have GUI? To say to bitcoin-qt that it should use RPC instead of going to disk files (which are ...
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1answer
26 views

Cannot get the same address format from zeroMQ and Bitcoin Core

I use nodejs with this npm library: const bitcoinjs = require('bitcoinjs-lib'); // version "^5.1.6" I received a rawTx from zeroMq, then extract it: const tx = bitcoinjs.Transaction.fromHex(rawTx);...
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30 views

Sent some testnet Bitcoin to Bitcoin Core wallet but balance is still zero

I got the testnet Bitcoin address with this command: bitcoin-cli -testnet getnewaddress And here is the Bitcoin address: 2NDtNjDbEiNiKDuAnwyKBmRPQ49NNpesdhE As you can see in blockchain there was a ...
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0answers
31 views

Automatically restarting bitcoind five minutes after reboot on ubuntu

How can I run bitcoind automatically five minutes after restart? So far I have crontab set up to reboot my computer every morning at 4AM (it runs into issues when it stays on for more than a couple ...
2
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1answer
163 views

My first full node - no bitcoin.conf

So I am in the process of downloading the blocks after installing bitcoin on my ubuntu server. I have followed the guide on https://bitcoin.org/en/full-node. Everything is working correctly. Blocks ...
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1answer
24 views

`createpsbt` RPC call doesn't provide PSBT inputs & outputs

I'm attempting to create a PSBT using RPC: bitcoin-cli createpsbt [[{"txid": "1d76879500aecafde541770b5d44ccec5955b4c1a455fae446bf1df7b5ea43e9", "vout": 0}, {"txid": "...
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1answer
27 views

Where does Bitcoin Core store DB_LAST_BLOCK?

My understanding is that Bitcoin Core stores where it left off(DB_LAST_BLOCK) in $DATADIR/blocks/index. But which is the actual file bitcoin core stores it at?
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1answer
18 views

How to generate html with coverage data?

I built bitcoin as: ./autogen.sh ./configure --without-gui --enable-lcov make -j4 ./src/test/test_bitcoin I see bunch of *.gcno files. How do I generate html?
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1answer
34 views

Without knowing private public key any one can withdraw btc from address. Is it possible?'

Actually I am using blockcypher API for creating address of btc and storing all records in my database with private and public key of individual address and assign that to particular users. But few ...
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1answer
18 views

How to run a python script when occur incoming transaction in Bitcoin core 0.18?

I want to run a python script when occur an incoming transaction. I think set zapwallettxes flag in bitcoin.conf but I don't know where set the script path to execute. Is it possible to execute ...
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0answers
25 views

Implement Bitcoin on my platform? [on hold]

I want users to deposit/withdraw funds from my platform. All deposits should go to my cold wallet and withdrawals will be done manually. Users have to buy/sell services inside my platform, but the ...
2
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0answers
14 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 ...
2
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1answer
30 views

Why does the “uptime” RPC API call fail if Bitcoin Core is running but has not synced fully?

At least this appears to be the case, because the function I have created to determine whether Bitcoin Core is "working" does the most minimal/simple API call I could find, which was "uptime", to see ...
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28 views

Backuping account system of bitcoin-core

I'm using bitcoin-core 0.16 currently, i have quite a few number of accounts with the transactions to this accounts. Now, i want to transfer my wallet to another machine, which files should i also ...
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0answers
27 views

How to add money to my Bitcoin Wallet and send my first Raw Transaction with OP_RETURN using bitcoin-cli

Background So after reading these two articles (Learning Bitcoin from the Command Line and Mastering Bitcoin), I am trying to piece together how I can get my first transaction with OP_RETURN data ...
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19 views

Getting Started with a Hello World Node.js App making an API call to bitcoin.org

I have been reading around trying to find where/how you can attach a SHA256 or MD5 hash (i.e. a small chunk of data) to a Bitcoin transaction, which led to OP_RETURN, but I have yet to see exactly how ...
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1answer
43 views

Bitcoin JSON RPC not working on Remote IP

i cannot get it to work firstly i was able to use bitcoind in my vps (locally) but when i added rpcbind and allowip to my bitcoin.conf i cannot even use bitcoin-cli its giving me this error: error: ...
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1answer
24 views

Running bitcoin node in docker behind NAT

A running bitcoin node doesn't accept incoming connections when it's running behind NAT in a docker container. To confirm the problem is related to docker I edited NAT settings on my router. If ...
2
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1answer
42 views

Can I import my wallet while my btc core is syncing

I'm upgrading my btc core to v0.18.1. I'd like to export my wallet to electrum. Is it possible while syncing? How?
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0answers
16 views

Would appreciate some help getting datadir parameter to work in Linux Mint 19.2

I am trying to use Bitcoin Core 0.18.1 on Linux Mint 19.2. I have previously used an older version on Win7 with no problems. I have moved my old data directory to a new ext4 partition on an internal ...
2
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1answer
50 views

Possible race condition(double spend) on HTLC-Timeout in the lightning network?

From the offered HTLC Outputs, # To remote node with revocation key OP_DUP OP_HASH160 <RIPEMD160(SHA256(revocationpubkey))> OP_EQUAL OP_IF OP_CHECKSIG OP_ELSE <remote_htlcpubkey> ...
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1answer
32 views

Bitcoin And BitcoinCash Input Value [closed]

According to bip 143 (https://github.com/bitcoin/bips/blob/master/bip-0143.mediawiki), bitcoin transaction has the information about the input value as part of the witness. i heard bitcoincash has ...
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1answer
17 views

Imported keys to electrum

I recently had an unconfirmed transaction on my btc qt wallet. I am upgrading my btc qt now and it is syncing. In the meantime I imported my keys from all my receiving addresses to a software wallet. ...
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1answer
12 views

Flatpak bitcoin-core not generating .cookie file

I'm using the version of Bitcoin-Qt 0.18.1 that comes with Flatpak. I've looked in the Bitcoin datadir, which is in ~/.var/app/org.bitcoincore.bitcoin-qt/data/ and there isn't any .cookie file there. ...
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1answer
34 views

Receive/send Transactions latency

I am on Ubuntu 16.04, with the latest version of Bitcoin Core, synced and working. I would like to know why is there a little delay of approximately 1 sec, sometimes more, before a received ...
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2answers
66 views

Unconfirmed transaction. How to make my wallet made whole

I am running a node with an unconfirmed transaction. I tried shutting down my btc qt so the transaction would be forgotten. To no avail it keeps rebroadcasting the transaction. I am in the process of ...
2
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2answers
57 views

How do I get the scriptPubKey type from the raw output script?

I use zeroMQ to get the transactions from Bitcoin Core. The output looks like this: { value: 200000, script: <Buffer 00 20 e3 30 7e 8e 0b 63 0e 53 c2 f1 f8 17 06 7b ce 01 c4 38 92 83 3e 02 2d ad ...
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1answer
25 views

What would be the effect on the number of leading zeros hash generation if bitcoin increase its nonce size from 32 to 60 or 100 bits?

If Bitcoin increases its nonce size from 32 bits to double or triple the size, how will it affect the speed of getting the right hash with the required number of zeros?
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1answer
53 views

How to Pay to Multisig Wallet Using python-bitcoinrpc?

How do I pay to a multisig wallet? I am using the Python API (based on python-bitcoinrpc) that ships with the bitcoin source code, in directory bitcoin/test/functional. I'm using regtest. I call ...