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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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1answer
58 views

Get input address using VIN txid?

I have written following script to get Vin address from Vin txids. #!/usr/bin/python # -*- coding: utf-8 -*- import requests,json url="http://asd:asdf@localhost:2332" payload={} payload = {"jsonrpc":...
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2answers
17 views

Logic thread between output folders and input transactions

I'm studying the bitcoin protocol and I don't have very clear things, for example the logical thread that exists between an output transaction and a subsequent input transaction, where that output is ...
0
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1answer
18 views

Hash rate, transaction and block relationship

I'm aware that when the hash of the block header (block hash) is below the difficulty target, a block is deemed as validated. But because I've never run a bitcoin node before (will soon), I had a ...
1
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2answers
51 views

How do different blockchains communicate?

I've learned that the different cryptocurrencies have their own P2P blockchain networks. How do exchanges convert coins from one network into a coin on another network?
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2answers
11 views

Public Addresses: '3' vs '1' in front [Bitcoin]

I just wanted to confirm, is it true that for a bitcoin (public) address it should always have a '1' in front of it. For certain transactions though I see that there is a '3' in front. How is this ...
1
vote
1answer
309 views

Did I lost my balance by using an old wallet.dat?

I saved a copy of my wallet.dat as a backup, i used it to transfer 1 btc to another address, now it's got 1 btc less in the total. now I deleted the wallet.dat and open the wallet with the saved ...
0
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0answers
29 views

Recovering wallet after formatting SSD

I am not exactly sure what I need to do and I do not want to accidentally overwrite my disk. I may have already done so. After searching my web history I have found the BTC address that my BTC is on ...
0
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1answer
66 views

Wallet shows 0.00000000 btc

I’m running a Antminer S9 for a week now Just today the wallet finally synchronised but shows 0.00000000 btc 🤔 why?
0
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1answer
86 views

Sync bitcoin transaction status to local database

I am sending bitcoin transaction in node js via bitcore-lib and bitcore-explorers. I realized that when i call the function .broadcast to send the transaction to network and returns value, it means ...
1
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2answers
59 views

I am unable to sync with the network because I have too little disk space

I downloaded Bîtcoin Core on a laptop without knowing it takes up a lot of space and my laptop has only 128 GB disk space. It keeps saying "low disk space" so it won't sync. I sent lots of bitcoins ...
3
votes
1answer
33 views

Differences to CCompactSize and CVarInt

I'm developing a parser bitcoin core and I have a problem whit the type CVarInt, I using the decodifier mode of the CCompact size but at the block 976 I Have a problem whit the type, because the value ...
5
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2answers
793 views

bitcond and bitcoin-Qt system configuration and bandwidth requirements

What is the best operating system configuration for a computer to run (bitcoind or bitcoin-Qt) and (BFGminer or CGMiner) under Linux, assuming that it will be connected to a 3 Terrahash mining rig on ...
0
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1answer
1k views

How to send Bitcoin in the Testnet?

I'm using this library: https://github.com/lian/bitcoin-ruby And here's my code: require 'open-uri' require 'net/http' require 'net/https' require 'json' require 'bitcoin' Bitcoin.network = :...
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1answer
23 views

Is mining using with cpu(some web sites) fake or not

There is a rule about every browser : Browser can not access client's RAM-CPU-HARD DRIVE-WEB CAMERA-And other resources of client's machine. Am i right? So how some web sites do mining using client's ...
2
votes
1answer
112 views

Upgrade from Bitcoin QT 0.8.5 to latest Bitcoin Core 0.15.X

I bought and transacted BTC in 2013/2014. I had a Bitcoin QT 0.8.5 wallet. I plugged it in and it updated correctly to the latest block. It correctly showed my BTC balance. I made a transaction ...
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0answers
27 views

Isn't Bitcoin just a bubble? [on hold]

Is Bitcoin and cryptocurrencies in general the future? I am genuinely interested in other people's view point.
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0answers
20 views

My transaction has been on pending for 48hrs [duplicate]

Please I need help and I need to know how long it will stay and I don't change my transaction fee
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1answer
97 views

Manually create a transaction to spend the output of a P2SH tx

I want to manually create a transaction to spend the output of a P2SH tx, but I don't know where the redeem script should be placed in the new transaction? I followed an online tutorial Building a ...
0
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2answers
77 views

What will happen if i change the checkpoint data from bitcoin source code and try to synchronice with blockchain?

Suppose i have fully synchronosed bitcoin node running in my local machine and i change its checkpoints data apart from its genesis block and recompile the code. Now what will happen when i try to run ...
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2answers
205 views

how to fix Bitcoin core 14.2 on Windows 10 Home 64bit ver.

I cant install Bitcoin Core 13.2 thru 15.01 64 bit on my window 10 64 bit system it worked ver 14.2 worked before I tried to sign into coinbase that emailed me an address that needed to Identify my ...
3
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1answer
50 views

Export Xpubkey from Bitcoin Core

How do I export my HD wallet's Xpubkey in Bitcoin Core? Do I construct it using the value of "hdseedid" returned by getwalletinfo?
-1
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2answers
70 views

Historical prices of currencies

Where can I get historical prices for coins, with the ability to store the information. I understand that most APIs do not allow you to save their information, any that do?
0
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3answers
404 views

Is it possible to get all transactions from a single address with bitcoind?

Is it possible to get all transactions from a single address with bitcoind?
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1answer
16 views

What are the web3py equivalent for communicating with bitcoin in Python?

I am fairly new to working with Python, I have a requirement where I need to perform some basic bitcoin operations on my local system rather than relying on some external API's, those function mainly ...
2
votes
3answers
73 views

CHECKSEQUENCEVERIFY After x time of last transaction

Is there a way where i can have a multi-sig address which will allow one of the signers to use only their single key after a set amount of time after each transaction/update on the address? I want ...
0
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2answers
49 views

Is it possible to generate(mine) a block with specific transaction via bitcoin-cli on regtest?

I want to generate a block with specific transaction via bitcoin-cli on regtest. The "generate" command does not have the option. It collects transactions in mempool by the default rule. I guess I ...
0
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1answer
101 views

How to retrieve transactions in realtime from bitcoind .dat files

I want to get all the data from blocks as they get updated on my local node. Abe offers very poor performance, and fast-dat-parser creates other .dat files and doesn't have enough documentation for me ...
0
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1answer
33 views

I formated my hard drive with bitcoin core on it

First timer here ...I downloaded bitcoin core a few weeks ago until last week where it still had not synced so i started all over...I was originally waiting for BTC CORE to synchronize(I missed the ...
2
votes
1answer
699 views

Run bitcoin-qt at startup of Windows server

I am running bitcoin-qt on my server. I use .Net library to query it through windows services. It all works when I start bitcoin-qt manually. But if the server is restarted, I see that it is running ...
1
vote
1answer
1k views

Unable to make Bitcoind commands

I am attempting to make Bitcoin-RPC commands in the Windows 10 terminal using Bitcoind from the Bitcoin Core. However, whenever I start C:\Program Files\Bitcoin\daemon>bitcoind the terminal hangs ...
1
vote
1answer
36 views

Script Null into raw trasaction bitcoin core

I'm developing a parser for bitcoin core and into the alpha test of the parser,I noticed than the script bitcoin core are null and the hash raw transaction exist. An example: for this transaction the ...
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1answer
22 views

How do I run the bitcoin bx tool in my terminal

I am reading the book Mastering Bitcoin. At some point, I came accross the bx command and tried to run it in the same way as bitcoin-cli (I've got a bitcoin core node running). But I just get the ...
3
votes
1answer
1k views

How to build Bitcoin binaries for Windows on Ubuntu using cross-compile

I am trying to build Bitcoin 0.13 for Windows. I've always used this guide for building previous versions. Now seems that developers have changed their mind regarding Windows, and the new way seems ...
1
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1answer
496 views

Backing up Bitcoin using only private keys?

So I'm really new to Bitcoin and cryptocurrencies, and I don't truly understand realtion between Bitcoin private and public key, and address! I understand that for every private key, there is a ...
0
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1answer
74 views

What happens to a node if .bitcoin/chainstate is corrupted?

I tried to search for answers to my questions, but didn't find any, but please forgive me if this is a duplicate question. Suppose somehow .bitcoin/chainstate gets corrupted, e.g., a UTXO is deleted. ...
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0answers
15 views

HashRate After 24 hours reduce

I Have two whatsminner m3x , when I start mining hashRate be 12 , after 24 hours hash rate be between 2 and 3 , and I don't know why?? what I must to do? , my device connect to Slushpool
1
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1answer
313 views

Need help to understand where bitcoin transaction has gone

I am new with bitcoin and I need some help from experienced members. I have a server with bitcoin core where we accept some payments and use bitcoin core as mercant. The problem is that we have got ...
0
votes
1answer
64 views

Diferent redeemscript for the same scriptpubkey?

Most transactions to p2sh address has the follwing scriptpubkey HASH160 f45d94733d430261962932e0c847075195916a04 OP_EQUAL As I understood, this transaction do not need to be signed. Is it true? ...
0
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1answer
301 views

Bitcoin Core lost coins

i have lost a bit of coins using Bitcoin Core wallet. I have send my coins from Bitcoin Core wallet to my address on Bitstamp(copy/paste,no mistake here) and on my Bitcoin Core wallet has said "sent" ...
2
votes
2answers
60 views

Security implications of bitcoin.conf location

I'm setting up and hardening a dedicated headless bitcoind and lightning daemon and wanted to have a discussion about location of the bitcoin.conf. Item #1: Bitcoind defaults to using ~/.bitcoin/...
0
votes
2answers
178 views

Sending BTC using Seed Hex or mnemonic

I’m interested in sending BTC from wallet to another and probably automate it through some libraries. I have a question: if I have a seed hex or 12 words I can generate all my wallets (addresses, ...
7
votes
1answer
337 views

Can*t call chainActive.Tip()->nHeight in core.cpp

I want to call chainActive.Tip()->nHeight in core.cpp. It is not possible, I am interested in every idea. https://github.com/LIMXTEC/BitSend/blob/DEV-joshafest/src/core.cpp Here is an example : ...
1
vote
2answers
70 views

What happens when a node cannot find the base Block of a newly received Block

This particular question has been bugging my mind for sometime now. Suppose there an adversary miner who mines a Block with one of his transactions. The miner would only send the updated Block to a ...
4
votes
1answer
33 views

Can bitcoin core verify a third party blockchain download?

If you were to obtain a copy of the bitcoin blockchain, i.e. a copy of someone's data dir excluding his wallet files on a removable drive or other storage medium, could bitcoin core verify that or not?...
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0answers
11 views

Listaccount CLI command shows balance, but getbalance shows different balance

I was sending some coins to myself using sendtoaddress, through the address I created using ./someBTCfork-cli getnewaddress When I run ./someBTCfork-cli getbalance "" My balance is 4999 When I ...
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2answers
29 views

Bitcoin Core frozen trying to sync and/or connecting to peers

I downloaded Bitcoin Core directly to my laptop and sent BTC to what i believe is my wallet. The BTC is no longer in my senders wallet and I do not see it in my bitcoin core wallet. It was working ...
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0answers
23 views

Is 10K full nodes enough to bitcoin to avoid 51% attack?

As I know bitcoin has about 10K full nodes. And the question is in my mind is that: This number is not huge! If someone has 6K servers, Can control the bitcoin via 51% attack? I was thinking if ...
2
votes
1answer
114 views

Wallet for btc bot

Which bitcoin wallet should I use to manipulate it programmatically? I don't want to use heavy bitcoin-core. But as I understand there are different kinds of bitcoin's thin clients: some outsource ...
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1answer
27 views

Batching transactions to safe on fees

I have some bitcoin spread across multiple addresses. I would like to move these to different addresses. I've heard about batching and was wondering if it is possible to batch the transaction to ...
0
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1answer
27 views

How can I get whole info about tranasaction whose outputs are spent?

I use RPC method getrawtransaction to get whole info about transaction. But if I rigth understood It works only for transaction whose contains at least one unspent output. How can I get whole info ...