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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1answer
13 views

Opening a wallet with bitcoind

I am running bitcoind after previously running bitcoin-qt. I made a wallet with bitcoin-qt (and encrypted it) and I would like to open it now with bitcoind. The folder that contains the wallet.dat ...
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1answer
20 views

Relationship of Bitcoin address and Public Key

I am trying to understand relationship between your Public Key and bitcoin address. After reading few blogs my understanding was that after generating your Master Key pair, in HD wallet. One should ...
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4answers
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How does bitcoind choose its data directory?

Sorry, noob question I am new to anything linux related. I managed to set up bitcoin core just fine on my raspberry pi 4 and I have an external HDD that I want to use as my data directory for the 250 ...
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Python Pycoin pycoin.encoding.EncodingError: bad character 123 in string

I'm working on a project using blockchain in which one of its dependency is Pycoin. I have to pass the PrivateKey of my Bitcoin testnet wallet for the transaction but it gives an error as below: File ...
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2answers
26 views

Segwit Bitcoin Transaction Signing

As I could understand, we can recover the R and the S values from any transaction following the ScriptSig where we have DER serialization. Segwit transactions, where the signature will be in the ...
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2answers
14 views

bitcoin core test config error

I tried configuring the bitcoin core test by editing the bitcoin.conf file with the required credentials. Earlier, before the writing the test credentials it was a running full node. now the error is ...
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1answer
29 views

Segwit with Multisig

I was analyzing a Bitcoin transaction that works both with Segwit and non-Segwit for multisig Scripts. Here is the transaction: https://www.blockchain.com/en/btc/tx/...
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33 views

contract to exchange bitcoin for eth

I'm thinking about a decentralized service to exchange bitcoin for eth or any other ERC20 token. Probably something that bisq already does. Let's say A wants to sell 1 BTC for 5 ETH to B. Both have ...
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20 views

wat does this mean replace-by-fee [closed]

Problem with blockchain Today i login and found my btc gone when i check transactions it shows btc sent to some wallet with replace by fee is my btc gone? and why
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having a problem with python code,bitcoin, (pip install bitcoin),ill bold the area where I think my issue is

I want to save a wallet, here is a small code as an example, I do not know where the code begins or ends here, and whether to paste this in the command interface, or the text editor like is mentioned ...
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How to configure rpcallowip with rpcbind - version 0.17.0

I'm trying to understand the difference between rpcallowip and rpcbind. I run bitcoind v0.17.0 in bitcoin.conf, I have: rpcport=8332 rpcallowip=0.0.0.0/0 which should allow every connection from ...
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1answer
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Where do I include my wallet address after finding the hash less than target - bitcoin

Please help me understand the logic behind mining a bitcoin from scratch. I want to create a bitcoin miner, it will not receive any blocks from any pools. All should be done inside the miner. So, I ...
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Question to Marco Falke and to other Bitcoin Core developpers and/or reviewers [closed]

Dear Bitcoin community members, I will explained briefly the reason why I am writing here. I am working as a PhD student on the functioning of cryptocurrency governance. I'm trying to document two ...
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2answers
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how to use bitcoind “walletnotify” for unique transactions only

while using bitcoind "walletnotify" my curl command is getting 3 hits generating 3 unique transaction hashes but requirement is to execute only once for unique transactions. I heard about ...
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1answer
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Is it possible, with bitcoin-core or btcd, to manually set the scriptSig field in a coinbase transaction?

I am talking about when using regtest or simnet modes. For context, it is so that I can create coinbase transactions with reproducible txids.
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Can anyone help? [duplicate]

My friend said he sent me 0.077 BTC, but i have only received 0.037 BTC. The Bitcoin explorer shows that there are 2 output, one of 0.037 going to my BTC address, another 0.039 went to a different ...
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Is it possible to handle BCH transactions on Bitcoin Core wallet? [closed]

I've installed Bitcoin Core on a server and it works well for BTC. I would like to know can I use the same server and platform to support BCH too? I know that the addresses generated in Bitcoin Core ...
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1answer
17 views

Are the indexes generated by txindex=1 persisted to disk?

I'm running bitcoind with the option -txindex. $ bitcoind -txindex it seems to be taking around a day to fully index the whole blockchain. (I'm using a raspberry pi 4, 4GB of Ram, with an external ...
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Bitcoin core node not sending outbound connections only inbound traffic

My bitcoin core is not sending outbound connections. It's only getting inbound connections. Iv deleted the whole node then reinstalled it. Still it was only getting inbound connections. Iv checked ...
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1answer
27 views

How do I get Raw Transaction Txid, Scriptpubkey Using Bitcoin Core Console

I just finished downloading bitcoin core on windows 7 and I am trying to create a raw transaction. When I typed listunspent 0 or listunspent 1 on console, I got no message (empty message) in the ...
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1answer
24 views

Does restoring wallet.dat require the same paths and configs in servers?

I have a Bitcoin core server (Server 1) which is working well. Now I am testing backing up and restoring its wallet on a new server (Server 2). Imagine that the server 1 has these configs: ...
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23 views

Why are there equal send transactions for each receive on Bitcoin Core?

I've lunched a new Bitcoin core wallet, and generated some addresses using it. Then I tried to receive some BTC to these address, and then, found out if I receive some BTC, there are equal send ...
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2answers
41 views

How to find/view derivation path in Bitcoin Core

I have found many default derivation path online which is used in bitcoin core, but i still can't get the correct one so that i can import my bitcoin wallet to my electrum wallet (BIP 39 option) with ...
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1answer
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bitcoind multisig transaction not shown as multisig transaction / shown as “signed” by 2:3

Seems like there was a change in how multisig transactions are being created. Running a node using bitcoind v0.16.3 and another one using latest bitcoind (v.0.19.0.1). The multisig transaction ...
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19 views

How to achieve fast mempool synchronization at startup?

I just started my 'occasional' full-node and I am watching the size of the mempool grow after full block synchronization - watch -n 3 'bitcoin-cli getrawmempool true |jq "length"' - it has around 4000 ...
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1answer
51 views

What does best block time mean in wallet.dat

I have a wallet.dat file that states: Best block at time of backup was 42603 (0000000013136bd812212959a15ef0ea0f084ee2c64e2f7f0e127d198f67a37f), mined on 2010-02-26T00:36:08Z Does that mean that one ...
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1answer
25 views

Calculate Transaction Confirmations

I am writing an API for one of my systems which can verify if a monitored address is receiving Bitcoin, I can already check if the address is on the newly received block, save it to a database for ...
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1answer
30 views

How to connect 2 wallets locally to each other?

I remember somewhere I saw how to do it, but I can’t find I want to run 2 wallets without nodes and connect them locally to each other.
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1answer
55 views

Bitcoin core v0.19.0.1 automatically prunes. I keep loosing the blockchain. How can I stop this?

Bitcoin core v0.19.0.1 automatically prunes. I keep loosing the blockchain. How can I stop this? I went into preferences and I de-selected the pruning. I also added the line prune=0 to bitcoin.conf. ...
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21 views

I can not install a new MAC OS wallet bitcoin-qt

I launch the wallet, the block index starts loading, then blocks are rewound, then 1% and after the wallet crashes, what should I do ?
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26 views

Bitcoin non-standard transaction

Is there a way to create raw bitcoin transaction without balance to a new bitcoin address in the bitcoin testnet. Maybe by referencing past utxo but signed with a different key. It might not be like ...
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How to get addresses from a transaction's vin?

How can i decode addresses from the following transaction's vin. Transaction: https://blockchair.com/bitcoin/transaction/ed8286d06f6df2269e8481b37bbc532c11d80bd2d1b155c920a0742daf3185b2 There are ...
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22 views

Probablity of wining a block reward in bitcoin [closed]

There two people, Alice and Bob. what is the probability for Alice to win the next block? Alice hash rate is A Bob hash rate is B (it means finding the probability in the function of hash rate)
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1answer
38 views

Addresses found in wallet.dat that start 00 14

I found a list of addresses in my dumped wallet.dat file that all start 00 14... They are script=1. What are these encoded with and how to decode?
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41 views

Creating a unconfirmed bitcoin transaction

I know that it's sounds ridiculous, but i need to create an unconfirmed bitcoin transaction that will be unconfirmed for 2+ hours.I came to a conclusion that i need to create a 0 fee transactions but ...
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14 views

Is Bitcoin software—the Windows one from bitcoin.org— compatible with Binance BEP2 network?

Sending straight BTCs from Binance to Bitcoin.org's wallet work?
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1answer
28 views

How ./configure Bitcoin Core build to pick up depends build and installation path at the same time?

I'm trying to build Bitcoin Core and, if I understand it correctly, the configure script uses the --prefix= option twice, once for the inclusion of the depends build (from depends/README.md): **...
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1answer
81 views

How does Bitcoin Core know the progress of blockchain without connecting to peers?

I restarted my Bitcoin Core node after a gap of about a day and when seeing the console log, I noticed that it calculated the progress of my blockchain even before connecting to peers. The log ...
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1answer
19 views

Is it yet possible to send a message to the wallet which receives Bitcoin when making a transaction?

I wish to be able to do something like this: bitcoin://anaddressgoeshere?message_to_wallet_owner=Keep+up+the+good+work,+dude! After clicking that link, which opens the user's Bitcoin Core wallet, ...
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1answer
32 views

Bitcoin Core full node has saved a lot more space than 260gb

I've had Bitcoin Core running on my Macbook i5, 8gb ram, the last five nights and have gotten to 58%. It's downloading to an external hdd and now the blocks directory contains 375gb of data. Another ...
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0answers
23 views

Bitcoin Core full node download crashes all the time

I'm downloading the full blockchain for the first time, and have only got a couple of laptops with i5 and 8gb ram and a couple of external hdds. The download has run for a long time on one of the hdds ...
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0answers
19 views

Creating and broadcasting a bitcoin transaction

I would like to create a bitcoin transaction with no fee . So i tried by creating a raw transaction using some online services and by coding it using node.js and bitcore library , but I did not get ...
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2answers
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What is the currently most efficient and reliable method to store the Bitcoin blockchain in a local database?

I have seen several posts on this before, and have tried all the suggested solutions, but I can't get any of them to work. I am interested in analysing transactions with the OP_RETURN opcode for a ...
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1answer
22 views

Bitcoind not publishing blocks via ZMQ after reorganization

On the testnet, I am running a bitcoin core deamon (bitcoind) and am using ZMQ to receive updates about transactions and blocks (subscribed to both 'rawblock' and 'rawtx'). I was curious as to how ...
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1answer
40 views

Importing master keys on bitcoin core

I want to use a mnemonic phrase and BIP 39 to store the keys, and use bitcoin-core, I understand that master private keys cannot be imported at least directly and that mnemonic phrase is not supported....
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1answer
33 views

How do I fetch the price data from CoinGecko? [closed]

I don't understand their API: https://www.coingecko.com/en/api It says: /simple/price Get the current price of any cryptocurrencies in any other supported currencies that you need. But then ...
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30 views

Optimally determine which transaction spent a transaction output

As it has been discussed before, it is very inneficient to find which transaction has spent a transaction output using bitcoin core alone. I found a way of doing it with an electrumx server running on ...
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how to move my Bitcoin core wallet to electrum while syncing

How do I move my btc qt wallet to electrum while syncing? Not address by address. Removed some addresses already but I'm still missing some coins. Don't understand the discrepancy. Any help would ...
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How can I do CDataStream to String to CDataStream conversion?

I'm developing a bitcoin application which saves Block to a file from which it can be read at later point of time. So I'm converting CDataStream vRecv to hex string using below bitcoin defined ...

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