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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How to get BIP34Hash and nMinimumChainWork?

I'm interested in the technical question of how you got BIP34Hash and nMinimumChainWork. The changes were introduced here: nMinimumChainWork: https://github.com/bitcoin/bitcoin/commit/...
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1answer
654 views

Can we derive parent’s private key using child’s private key?

In the book named Mastering Bitcoin by Andreas, the author described the usage of derived child keys. One thing I noted was that he said(page 108), The derivation function is a one-way function, ...
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2answers
350 views

Which scripts are currently considered standard and therefore actually propagated?

All I've learned about script so far is that while theoretically quite versatile (e.g. allowing multisignature transactions) most scripts are simply not propagated by the default client nodes, i.e. ...
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3answers
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get Armory to use an existing blockchain?

I'm trying to set up Armory but it wants to download the whole blockchain. The thing is I already have the blockchain downloaded on the same machine for bitcoin-qt. Is there any way to get Armory to ...
4
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2answers
5k views

How to move the blockchain data while still being able to use the wallet?

Using the standard client, Bitcoin-Qt, v0.8.1: (win10x64) I would like to move the blockchain data from its default location to a different location (maybe even an external disk or NAS drive). What ...
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1answer
773 views

interacting with bitcoin over docker

I've created a docker container of an ubuntu machine, loaded it up with all the dependencies specified in the unix build doc and then built bitcoin and run it with the following command: ./src/...
2
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1answer
2k views

Data directory issue

I have everything set up normally. My only issue is that my data directory is in C:\Users\User Name\AppData\Roaming\Bitcoin. Normaly this is what you would want, but, if you noticed, my username has ...
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2answers
2k views

How does the Bitcoin Standard Client wallet encryption work?

I encrypted my wallet using Bitcoin QT, then closed the application. When I restarted Bitcoin QT, it did not ask for the passphrase. But I could still access the wallet. How is it possible to access ...
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2answers
3k views

How to get balance by any address using rpc bitcoind?

How to get balance of any address using rpc bitcoind? I mean getting by address the list of his unspent outputs in view something like this: TxHash;Value;Noutput.
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1answer
906 views

testnet3 node sync process is very slow

My config file is similar to this: testnet=1 blocksonly=1 rpcport=5000 server=1 listen=0 prune=1000 dbcache=16000 rpcallowip=0.0.0.0/0 rpcuser=someuser rpcpassword=somepass I have started the ...
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1answer
182 views

Bitcoin ABC, When Fed Bitcoin Core Chain Syncs to Aug 1 6:23AM 2017, Then Freezes

I've installed Bitcoin ABC, set bitcoin.conf to point at a copy of my directory from Bitcoin Core, and let it sync with the network. All was well until it froze at the fork (Aug 1, 2017, 6:23AM). ...
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2answers
369 views

Free bitcoins are real? [closed]

That's confusing the bitcoins used for marketing are real or not.. like some posted a code in facebook or in social media for free bitcoin so those bitcoin are real or a just marketing, hacking ...
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3answers
8k views

Attacking Bitcoin with a supercomputer

The difficulty in Bitcoin is recalculated every 14 days. What if immediately after this difficulty adjustment someone targets Bitcoin nodes with a supercomputer and start creating new blocks? Such ...
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1answer
4k views

Does the Bitcoin Qt client have a minimum transaction fee?

I'm trying to transfer all of my 0.1 BTC located in one wallet to another wallet. I don't care how long it takes to finish, so I'd rather send it without paying any transaction fee. I'm new to this, ...
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3answers
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Why are m-of-n transactions not used today?

BIP 11 supports m-of-n transactions. While BIP 16 and BIP 17 are being debated and voted upon, I have to ask: why haven't there been evidence of BIP 11 used in for m-of-n transactions? All that BIP ...
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1answer
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How to restore Bitcoin Core HD wallet private keys by master key?

Since version 0.13.0 Bitcoin Core supports HD wallets. In a .txt dump of the wallet (created by JSON-RPC dumpwallet command), one can find an "extended private masterkey" which is intended to be used ...
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1answer
717 views

How is the transaction malleability issue being fixed?

With the upcoming release of Bitcoin Core 0.9, I am wondering how the transaction malleability issue is being fixed and what are the consequences of the fix? It appears that transaction malleability ...
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3answers
1k views

Would it be possible to provide a downloadable blockchain that is updated and verified by a mass of people?

As of November 2012, the blockchain is nearly 3 GB in size with a near-linear growth of about 500 MB/month (cut from exponential growth by the hard-coded block size limit, I guess). I want to install ...
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4answers
7k views

What does Litecoin offer over Bitcoin?

Litecoin is different from Bitcoin in the following ways, however none of them are particularly useful and on the contrary are only less worthy. 84 million vs 21 millions: since Bitcoin is divisible ...
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2answers
3k views

transaction creation failed

I am using bitcoin Qt version v0.7.0-beta and when I tried to send a transaction (1.5 bitcoins) I received a message transaction creation failed what can be the reason? Few minutes ago I sent 0.1 ...
4
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1answer
4k views

How to connect to a remote Bitcoin Core remotely

If I have 24/7 running bitcoind on a headless server, is there a graphical way to connect, maybe only temporarily to the server's Bitcoin Core daemon or its client to see if everything is going ...
3
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1answer
149 views

“New rules activated” warning after upgrading to 0.20.0

I've upgraded a node from the previous release. It's up and running but for some reasons I get this warning. How can it be related to the upgrade? $ bitcoin-cli -testnet getblockchaininfo | jq { "...
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3answers
1k views

Stuck duplicate transaction in BitcoinQT

I received two payments with the following transaction: https://blockchain.info/tx/12e487de6fd8d920446cd8663dc11977d185ceaa25b7c6f36921fb76e58875f0 On this transaction ...
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2answers
3k views

Is it possible to transfer blockchain data from one machine to another?

I want to run a bitcoin full node at home but the initial sync-up is taking days because of my slow internet connection. Can I download the blockchain data from a machine with faster connection and ...
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1answer
2k views

How do the people who work on Bitcoin Core get paid?

I'm wondering how the people who work on or manage Bitcoin Core get paid, e.g. Wladimir J. van der Laan. Do they do the work just... as volunteers?
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2answers
256 views

Adding Comment on Bitcoin Transaction (After Sent)

Is it possible to add a comment to a bitcoin transaction after it has been sent?
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1answer
2k views

Can't specify rpcport for testnet

Was there a recent change where it is no longer possible to specify rpcport? I noticed these two warnings: Warning: Config setting for -addnode only applied on test network when in [test] section. ...
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4answers
357 views

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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4answers
2k views

What would happen to the Bitcoin network if all ISP's collectively block port 8333 at once?

Will nodes still be able to find each other using today's official Bitcoin client?
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1answer
3k views

how to install Bitcoin and bitcoin cash on the same ubuntu server?

I've installed bitcoin core as the documentation in bitcoin.org and its working great. then, I tried to install bitcoin-ABC manually as following: wget bitcoin-cash-gnu.tar.gz tar xzf bitcoin-cash-...
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0answers
57 views

Bitcoin QT “No block source available”… stuck at “180200 out of 225430” [duplicate]

I have downloaded Bitcoin-qt and have encountered similar problems that others have on here. However, the offered solutions don't apply to me, because I run Mac OS. I get a status message that says "...
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3answers
1k views

When using bitcoin-cli I get an error regarding fallback fees when trying to send regtest Bitcoin. How do I resolve this?

I have been doing an assignment on Bitcoin Core 0.20. Now every time I try to do a transaction: Apples-iMac:bitcoin apple$ bitcoin-cli -regtest sendtoaddress ...
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1answer
258 views

How Bitcoin-Core does decide whether high fee during sendrawtransaction?

I am testing commands through Bitcoin testnet and Bitcoin Core. During the test, I intentionally attempted to create and broadcasts transactions by charging high fees.(1 BTC) During the final phase, ...
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1answer
526 views

How to upgrade Bitcoin Core from 0.18 to 0.20 on Ubuntu 18.04?

I've installed Bitcoin Core on Ubuntu 18.04 (CLI). Now, the version 0.20 of Bitcoin Core is released and I want to upgrade my server to it, but it seems the new version is not included in PPA yet. May ...
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3answers
3k views

Bitcoin.conf & JSON-RPC options

What does it mean in the bitcoin.conf file when it states: server=1 tells Bitcoin-Qt to accept JSON-RPC commands? If all one needs to do to solo mine is type setgenerate true in the console, ...
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1answer
242 views

Does, or will, Bitcoin Core support Lightning?

I vaguely understand what Lightning is, and would like to take advantage of it. However, actually using it seems extremely "fuzzy". If it requires some separate software to be trusted, ...
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1answer
8k views

cant see bitcoin after restore of backup [duplicate]

I made a backup of my Qt wallet. The blockchain never got completely downloaded and i was sent a bitcoin that i never saw in my wallet as the downloading of the blockchain never caught up with the ...
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1answer
3k views

Validation Error: Error #-26: 258: txn-mempool-conflict

I am getting this error message. What does it mean? Validation Error: Error #-26: 258: txn-mempool-conflict
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1answer
806 views

How to run Bitcoin Core as onion service on Windows, Ubuntu and Android?

Have you tried running Bitcoin Core listening on Tor on different platforms? What are your experiences, issues that you faced, hacks, workarounds etc.?
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1answer
138 views

How do I get old blocks while running a pruned node?

Hello I'm trying to build a NodeJS app that fetches Bitcoin blocks, potentially old ones, and I'm running into issues. I've downloaded Bitcoin Core but I don't have enough space to run a full node and ...
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1answer
2k views

bitcoin-qt keeps on quitting with “failed to read block”

I just wanted to install bitcoin-qt on another machine (all others are working fine) but I cannot seem to retrieve the block chain using bitcoin-qt 0.8.6-beta (as downloaded from http://sourceforge....
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2answers
69 views

Will Bitcoin copy Best Features of Litecoin, Ripple, if its Open Source?

Proponents of Bitcoin always mention that Bitcoin is Open Source, so if any better cryptocurrency comes along, Bitcoin can just copy those features in their open source. Both Litecoin and Ripple have ...
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2answers
147 views

Lessons from the Mt. Gox Hack - 850,000 Bitcoins Stolen

Mt. Gox was a bitcoin exchange based in Shibuya, Tokyo, Japan. Launched in July 2010, by 2013 and into 2014 it was handling over 70% of all bitcoin (BTC) transactions worldwide, as the largest bitcoin ...
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1answer
1k views

Lost my wallet password. Is there anything I can do? [duplicate]

I lost my bitcoin wallet password, it was stored on a USB and I've lost the usb. Luckily I have a backup of my wallet. Are there any way possible I can get my coins back? Is there a bitcoin wallet ...
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2answers
891 views

Bitcoin core setup how to prune without downloading?

I want to play around with code to learn about Bitcoin such as synchronizing the chain locally, verifying the Merkle tree, creating a new wallet programmatically. from what i've researched I will ...
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1answer
86 views

Why would Bitcoin Core freeze my computer when syncing? And is it supposed to take this long?

24 hours ago, I finally bit the bullet and dug up my old computer, set it up physically, installed Linux Mint (with full disk encryption), installed Bitcoin Core through its software manager, started ...
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2answers
151 views

Does Sovryn really not allow you to use it if you use Bitcoin Core?

https://live.sovryn.app/ This is apparently what Sovryn consists of. Not a downloadable application, but a website. It's very confusing, and so is its FAQ. When I click the "Engage Wallet" ...
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1answer
395 views

Web Wallet difference

I have some questions about the listed Web wallets. Can someone please help me understand? The bitcoin.org page for some web wallets says "Shared control over your money" (e.g. BitGo, BTC.com) while ...
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1answer
2k views

Blockchain.info, does recovery phrase recover all wallets?

I need some help understanding blockchain.info. 1. Under the Default wallet, I can generate multiple addresses and also see the Extended Public Key (xPub). If I go to the iancoleman BIP39 mnemonic ...
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2answers
471 views

how do you transfer your Bitcoin core wallet while syncing?

I would like to transfer my btc wallet to an electrum wallet. Syncing is taking to long.

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