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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2answers
32 views

Anonymous transactions with bitcoin core

Is there any chance that people will identify me when I have nordvpn running in the background when making transactions with bitcoin core? Already done this What are you recommendations to stay ...
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1answer
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How does this simple script use the OP_CHECKSIG opcode?

I have this Script P2PKH <A Signature> <A Public Key> OP_DUP OP_HASH160 <A Public Key Hash> OP_EQUALVERIFY OP_CHECKSIG The bitcoin.org documentation say this The entire ...
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How to segregate wallet from bitcoin core | Run multiple wallets in different servers on one centralized bitcoin node

I am running bitcoin full node in a centralized server. I have many web applications running in various places. I want to connect this web applications with centralized full bitcoin node. How to ...
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connected to self at xxx.xxx.xxx.xxx:xxxxx, disconnecting

Bitcoin Core 0.18.1 (Windows 10) Number of connections seems to be very unstable and only can stay connected to one node. debug log file has a continuing list like this: 2019-09-16T10:28:42Z ...
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1answer
26 views

Is writing unit tests a good way to start contributing to Bitcoin core?

I'm considering writing unit tests to Bitcoin core as a first step to C++ development and Bitcoin contribution. Anyone have any suggestions about the journey I'm about to begin and possible files that ...
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1answer
16 views

How to put comment when use sendrawtransaction in bitcoincore?

I use sendrawtransaction to submitt my transaction and I want to put comment or comment-to in transaction like sendtoaddress fields that store in the wallet and not sent with transactions. I think the ...
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1answer
38 views

Bitcoin API standard

I'm trying to implement a bitcoin full node while learning a new programming language, but I can't find the full set of public API that the full node has to expose. I assume the standard will be ...
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0answers
27 views

Withdraw bitcoin from the site cryptofree.biz? [closed]

For the test i had 1 bitcoin to this site, a deposit think that the alarm gives a membership, you confirm not to?for the harvest time should be 0.3 bitcoin to my account credit not find.if my account ...
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1answer
31 views

Resolve BTC long mem pool (many unconfirmed tx)

I've started with Bitcoin exchange service, by creating rawtransaction and broadcast it. The problem which I must face to face is too long mempool chain (over 25 unconfirmed transaction). Example: ...
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0answers
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mining bitcoin and server send to me bad txid [closed]

please help I mining bitcoin and server send transaction (txid) in this format : sent. Txs I'd:RNUPFMFGY6NMIWB54O3RG6BV8 my server is amazonaws and mining system is cloud mining Block chain website ...
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34 views

Create P2SH address is not same as address saved on rpc node

I have a private key and trying to create P2SH address on testnet like my node created but they're not same. Please help me a bit, thanks so much. PrivateKey: ...
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1answer
41 views

Possible to run a Lightning node on same computer as Bitcoin Core node?

I have a Windows 10 laptop that is running a full Bitcoin node using Bitcoin Core. Is it possible to also run a Lightning node on the same laptop simultaneously with the Bitcoin node?
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1answer
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How can I clone bitcoin 0.16.1 version (not the latest one ) with git command

this is the version that I want to clone : https://github.com/bitcoin/bitcoin/releases/tag/v0.16.1
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0answers
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Why am I getting error: “Signature must be zero for failed CHECK(MULTI)SIG operation” when using signrawtransactionwithkey

I am using descriptor based importmulti like so to import a 2 of 3 HD multisig cold storage wallet into my node: curl --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "importmulti", "...
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24 views

How do I determine the descriptor of a given Extended Public Key?

I am trying to run the bitcoin-cli getdescriptorinfo on a ypub... extended public key. Every time I do this I receive the message: error code: -5 error message: Invalid descriptor How can I ...
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42 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
29 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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27 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
112 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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0answers
11 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
44 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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0answers
23 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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0answers
22 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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25 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
57 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
13 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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14 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
20 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
26 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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0answers
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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
24 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
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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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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
20 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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27 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
130 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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0answers
21 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
40 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
9 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
47 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
27 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
58 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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0answers
17 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
25 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
20 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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0answers
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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0answers
41 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 ...
4
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1answer
35 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
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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 ...