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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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0answers
135 views

Sources to study Bitcoin source code, more specifically its UTXO model C++ code?

Can anyone suggest some sources to learn about the source code of bitcoin or similar tech which are using UTXO model for their transactions.
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145 views

How do bitcoin nodes know their own external IP address?

I'm studying the bitcoin source code and I have a doubt about if: Bitcoin nodes still follow the methods explained at the "Satoshi Client Node Discovery" wiki page? More specifically, if they follow ...
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77 views

Trying to connect to bitcoin core on Google Compute Engine from an external IP, I was getting “couldn't connect to host error”

I have having issue connecting my bitcoincore from an external ip address (Hostgator to be specific). The Bitcoin core is hosted on Google Compute Engine (Windows Sever 2012). Here is what i have ...
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64 views

Why does the feature_block.py bitcoin functional test fail in tagged release 0.16.0?

I tried running the unit and functional tests from the latest tagged release (0.16.0) from https://github.com/bitcoin/bitcoin.git. To my surprise, there is one functional test that persistently fails ...
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265 views

How does one create a blockchain snapshot (vs a bootstrap)?

I have read How to create a blockchain snapshot for a hardfork? but it does not answer this question. I understand the bootstrap.dat file is basically a concatenation of the blk000x.dat files, but ...
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176 views

Stateless vs Stateful wallets

Stateless wallet are wallets that do not store any information locally on the device. Stateful wallets are wallets that store information such as index of unused address. According to my ...
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2answers
75 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 ...
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70 views

How to list non-HD addresses in bitcoin core?

Let's say I imported some private keys, how do I distinguish between those and addresses generated from the HD master key?
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109 views

Why mining pool has different connections ports for different difficulty

In the documentation of mining pool I found following Connect Details: (Difficulty 5 - GPU) stratum+tcp://stratum.btcprivate.org:3032 (Difficulty 10 - GPU Farm) stratum+tcp://stratum....
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170 views

CLTV vs nLockTime

What is the difference between nLockTime and CLTV? Bitcoin Wiki says: When the CLTV opcode is called, it will cause the script to fail unless the nLockTime on the transaction is equal to or greater ...
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2answers
102 views

Bitcoin new receive addresses

With the Bitcoin-ABC cli I can generate as many receive addresses by the following command ./bitcoin-cli getnewaddress "label" But from my understanding the funds still go into the same wallet and ...
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487 views

call JSON RPC API Using C#?

I am trying to call JSON RPS API Using C#. I have added my own IP address with its credentials. Before writing API in C#, I have installed Bitcoin on my server. Now, using the server details, i ...
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121 views

Creating a raw transaction, Please help

I want to create a raw transaction with python and i found the script Makes a transaction from the inputsoutputs is a list of [redemptionSatoshis, outputScript] def makeRawTransaction(...
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31 views

How do i check how many transation were ever made on any blockchain

How do i check how many transaction were ever made on any blockchain. Am wondering this because the in the wallet under checkpoints it asks how many transaction were made since the last checkpoint and ...
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252 views

Bitcoin Core does not connect to the network

i have installed Bitcoin Core 0.15.1 on my computer. I also made a Port Forwarding for Port 8333 and gave my Computer a static IP Adress. My computer stats are: Intel Core i5 3.30GHz AMD Radeon R9 ...
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183 views

sendtoaddress not deducting from account

I have two accounts called "hot" and "cold" and have few address and transactions in each of them. I am trying to move some funds between "hot" to "cold" and using sendtoaddress like this bitcoin-...
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59 views

Bitcoin-core 0.15.1 gettransaction showing wrong fee for some transactions

What makes me wonder, this happens just for some transactions Take a look at this transaction: 20179d0d2fba68b2ca82ab8cc5faa39ced73324af6b90b6505cca2c3d65102a6 As you can see inputs/outputs fee is: ...
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661 views

How to get all transactions of address with bitcoin api in node.js?

I want to find all transactions of address in regtest. How it is possible to do? I have this solution, but I get response (201) before for ends. I think it's bitcoin timeout false. bitcoin....
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129 views

Bitcoin network information pubkeyhash privatekey

I am trying to set up a https://github.com/bitpay/bitcore Insight node but for a forked coin of Bitcoin. To complete the task I need to modify the following information but with the forks version. ...
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2answers
262 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 ...
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273 views

getpeerinfo peer port number

Working on regtest (Bitcoin Core 0.15.1) I've realized that some peers are identified just by ip instead of by ip:port when querying bitcoin-cli getpeerinfo. I've noticed that when it happens the ...
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0answers
588 views

How long until an Antminer S9 becomes obsolete and should be replaced?

I'm currently considering the purchase of a few Antminer S9 13.5 THs and I'd like to have an idea of how long I could (or should) plan to use one before replacing it with a newer model. I've seen ...
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173 views

How to build escrow feature in my website like paxful.com

i am building an exchange bitcoin website,but i want to know how to make the website a 3rd party between buyer and a seller to be an escrow like paxful.com any ideas about an API or a service that ...
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0answers
52 views

import hard wallet to bitcoin core

I'd like to hold my bitcoin on coinbase in a hard wallet. they explain that you can onyl do that by importing a hard wallet to online one like Bitcoincore. but how do you do that? import a hard ...
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57 views

Which peer-to-peer technologies are used to sync blocks in a blockchain?

I searched a lot about it but didn't found out anything. I want to know about the technologies used in block syncing and the algorithms.
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128 views

Test vectors for bitcoin core (blocks and transactions) needed

I am looking for test vectors to test edge cases of an implementation. For instance: "Unusual" blocks that made it to the blockchain Non standard transactions that made it to the blockchain Anything ...
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1answer
2k views

Tax implications of withdraw fee from one exchange (Binance) to another GDAX/Coinbase

I transferred 0.2 ETH and 0.3 ETH in separate transfers from GDAX to Binance (GDAX does not charge a fee for this). Then, I transferred back from Binance to GDAX all 0.5 ETH, but since Binance ...
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37 views

Old core wallet giving error at startup

I have a core wallet from 2011. a version 0.4.0 beta with almost 1 BTC. When I start up bitcoin.exe I can see content and all my adresses, but it constantly pops up with an error saying: EXCEPTION: ...
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540 views

error while loading shared libraries: libboost_system.so.1.63.0: cannot open shared object file: No such file or directory

I am trying to use bitcoin core in airgapped cold storage with tails installed on a usb. first i downloaded the 0.15.1 release bin files into tails storage. i could run the bitcoin-qt just fine. .......
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1answer
750 views

Trying to open an old bitcoin core wallet.dat file fails

I am trying to open an old (~2012) bitcoin core wallet.dat with a bitcoin.com wallet, and it says that my password is incorrect, although it works great on my bitcoin core wallet. Was there any ...
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267 views

Importing a paper wallet into Coinomi

What exactly is happening when you take a picture of the QR code from a bitcoin paper wallet with the Coinomi app? Are you executing a transfer of bitcoin from the paper wallet to the Coinomi wallet ...
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147 views

Blockchain syncing seems to be stuck bitcoin core wallet

I installed bitcoin core wallet and it work for a month, now syncing seems to be stuck on calculating progress increase per hour and nothing happens. how do I know if the syncing is progressing?
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27 views

Is it possible to set different fee for each account in bitcoin core

I have following accounts in bitcoin core: ajit@AjitSoman:~/git$ bitcoin-cli listaccounts { "": -0.83002768, "1": 1.10000000, "1470": 0.56739259, "1521": 0.63600000, } ajit@AjitSoman:~/git$ ...
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58 views

Share pre-fork blockchain between Bitcoin and Bitcoin Cash

I run full-node of Bitcoin on Bitcoin Core software. Now I want to also run full-node of Bitcoin Cash. I googled around and found three softwares which support Bitcoin Cash: Bitcoin ABC, Bitcoin ...
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102 views

Bitcoin Core on SD card

Running out of hard drive space, I bought a 256 GB SD card formatted with the FAT filesystem and moved my Bitcoin directory to it. After getting error messages I decided to delete it and redownload (...
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88 views

Transfer incoming funds from Bitcoin Core to another wallet before blockchain sync is completed

This is my situation: I have a Bitcoin-QT wallet on my Mac (Qt version 4.7.4.- yes I know its very old). only recently I've been working out how to operate and exchange bitcoins. well to cut a long ...
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1k views

I sent litecoin to my bitcoin address, on my nano ledger

So I am very new to cryptocurrencies and have already made my first mistake. I used shapeshift.io to transfer bitcoin to litecoin, and entered a bitcoin address as the recipient to receive the ...
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410 views

can i find my wallet address without opening bitcoin core qt

I havent ran bitcoin core qt for 4 years. And now the program wont run, just says bitcoin qt quit unexpectedly. A: How can i check my bitcoin address and balance B: How can i get the program working ...
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47 views

Do we know which companies donated to Bitcoin Core development?

Similar to a previous question (How do the people who work on Bitcoin Core get paid?) which I felt does not adequately answer my interest. Do we know specifically which developers are drawing a ...
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457 views

Bitcoin QT - why do I have an undefined reference to `qInitResources_bitcoin() error

I have built the Bitcoin source code, created my own genesis block and everything was working great! Now that I have changed the word bitcoin to GELF in some places of the program to suit my own ...
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494 views

Metcalfe's law for bitcoin price

Here's an inline link to article article the square function number of users times the average transaction value. 94% of the bitcoin moved over the past four years is explained by that equation. It ...
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96 views

How do i transfer Bitcoins from Bitcoin Core to BitGo?

How do i send my BitCoins from Bitcoin Core to BitGo?
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1answer
336 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 ...
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0answers
163 views

Share blockchain data between bitcoin-core and btc-1

I am currently running a BTC-1 node and would like to setup an additional core node before the November fork. Ideally, I would avoid the need to resync the entire blockchain again. Is it possible for ...
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622 views

bitcoind transaction fee calculation

I'm using bitcoind and for the transfer of tokens from one account to other, I'm using sendFrom method. but there is a transaction fee calculation and on the bitcoin-qt panel, In the transactions ...
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65 views

Bitcoin core closes inbound connections every 10 minutes

I noticed that Bitcoin core will close incoming connections every 10 minutes. Wireshark captures [FIN, ACK] are received from the node. It looks like Bitcoin core is monitoring the connection time. ...
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548 views

bitcoin.conf file on mac

I have installed bitcoin core on mac and accessed the config file from the preferences tab on the bitcoin-qt. Now, I have started testnet on it by the below settings. testnet=1 server=1 rpcuser=...
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352 views

I have bitcoin in an armory wallet - how do I get the Bitcoin Cash

I have an amount on bitcoin in an armory wallet from a year ago, and have never moved the coins. How do I get the bitcoin cash coins from this? Can I just install the bitcoin cash client and ...
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823 views

Is there a guide to uninstall bitcoin core ? Installation mess

Hi i'm wanting to do a full uninstall of bitcoin core and to follow a book that i've recently bought on programming on the bitcoin blockchain. I've tried removing all the data and running: sudo ...
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3answers
73 views

Storage exceeded in middle of synch

A friend gave me a few bitcoins a number of years ago. Yesterday, I read an article about bitcoin and it reminded me I had some. I went online to check the value and to possibly spend them. I tried to ...