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
357 views

Wallet loading failed: Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex

I have bitcoin core installed, with a sub wallet with some bitcoin on it. The default wallet appears to be working fine, but when I try to open the sub wallet with bitcoin on it, I get the error ...
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0answers
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How can I use a secondary disk for the blocks folder with the snap install?

I always installed bitcoin from the tar.gz but now tried the snap but it uses a different data folder, so I removed the blocks, chainstate and indexes and replaced them with the same old symlink to my ...
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1answer
41 views

bitcoind restarting on its own

I'm experiencing periodical node restart, happening every minute or two. Happens on Ubuntu 20.04LTS, bitcoind version is v0.21.0. I'm running it as a systemd service using the following file: ...
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2answers
66 views

My BTC hasn't shown up in my Wallet

I transferred BTC to my wallet and it hasn't shown up. IT's been 6 weeks and still nothing. I transferred my funds from Binance and Binance is showing that the BTC has been send and received. Bitcoin ...
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0answers
15 views

How to upgrade the current installed Bitcoin Core on Ubuntu to the latest version (0.21 v) [duplicate]

Just wondering how can I securely upgrade the current version of my Bitcoin Core to the latest released version without losing any data. It is all installed on a Ubuntu VM. The instructions I found ...
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1answer
72 views

I heard a message was encoded into the blockchain, how can I read it?

I have been running a few full Bitcoin nodes for a long while now and I've decided to start learning how to interact with a node to get different information. Recently, Elon Musk's two messages were ...
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1answer
59 views

“Hot”, “Cold” & “Warm” Storage Wallets? [duplicate]

I've seen a number of sites advertise they support "hot", "warm" and "cold" wallet storage solutions (the only thing I haven't seen so far are "frozen" wallets)....
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1answer
30 views

Why does the first bitcoin client only supported windows

Starting from version 0.1.0 up to 0.1.5 the bitcoin software could be run only on only Windows 2000 / Windows NT and Windows XP Was there a technical reason from Satoshi for this choice of operating ...
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1answer
204 views

Bitcoin-Qt client wallet.dat extract private key to import on another service

I have a file: wallet.dat where should be saved one or more private keys of my old wallet linked to one/more public btc addresses. I also had more than a wallet, so I don't really know if there are ...
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1answer
97 views

bitcoin.conf file is missing

Just installed bitcoin core v0.21.0 on my ubuntu server. When I run bitcoind -printtoconsole It says bitcoin.conf file is missing. 2021-01-30T15:36:58Z Bitcoin Core version v0.21.0 (release build) ...
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0answers
34 views

Bitcoin.text into Electrum issue with “0014” addresses

I am currently retrieving an old wallet. Which may have recieved btc from another wallet from around 2012/Be the old wallet. While copying in to Electrum to create a new wallet using Import bitcoin ...
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35 views

OpenSSL error when running “make” command

I am trying to install bitcoin core on my ubuntu server. installed necessary dependencies. RAN : ./autogen.sh ./configure --disable-wallet --with-incompatible-bdb --with-gui=no ./configure make I am ...
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1answer
21 views

Can an exchange or marketplace benefit from private key encryption?

A powerful security technique to prevent theft of Bitcoins from a user's online wallet is to encrypt the user's private key with his password without ever stroring the PK directly in the database. ...
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1answer
38 views

Storing your private key on a “security server”?

One of the suggested security precautions when storing Bitcoin of users on a server is to store the private keys on a separate server: The database storing the private keys or the seeds in case of ...
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0answers
175 views

Unable to reinstall Bitcoin Core 0.21

I had to remove Bitcoin Core and was trying to reinstall it. Each time I try to open the Bitcoin Core, I get the following message "Error initializing settings: Failed saving settings file: - ...
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2answers
116 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
57 views

End to end bitcoin transaction flow

My understanding on bitcoin blockchain technology after going through some articles in past few days. I'm not sure that my understanding is 100% correct. I'm writing so that someone can correct me ...
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1answer
33 views

How basecoin transaction is added to a block?

I'm new to blockchain and bitcoin. In my understanding, miners are trying to find a nonce that is added to a block, and then the hash of the block will have some zeros at first and the first ...
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1answer
36 views

Bitcoin Core not showing content of address

Bitcoin core newbie here. I have an old wallet backed up here, and upon download of the latest blockchain info, importing the wallet, my balance is empty. Now I do have 3 transactions which I made in ...
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5answers
76 views

Are ASICs Resistant to Malware Attacks?

One of the arguments made in favor of relying on ASIC mining hardware to secure the Bitcoin blockchain is that commodity hardware is more prone to a 51% attack since an attacker could easily infect ...
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2answers
658 views

Is there something about Bitcoin that prevents us from implementing the same privacy protocols of Monero and Zcash?

Certain coins like Monero and Zcash implement privacy protocols that make it nearly impossible to trace origin and destination of transactions - making them completely anonymous. I'm curious as to why ...
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1answer
57 views

What does the RPC call “getmemoryinfo” show?

What does the output of the RPC call getmemoryinfo actually mean? For example, this is from my node running in Docker. Does that mean the bitcoind process inside the container is only using 64272 ...
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2answers
98 views

What stops an attacker from crippling the Bitcoin network?

An individual (or government) who wants to bring down the Bitcoin network could conceivably broadcast a ton of junk/illegitimate transactions to the network thereby consuming the bandwidth and ...
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1answer
1k views

Aren't the Bitcoin receive addresses the public keys?

These public keys are easy enough for anyone to obtain from a Bitcoin address. Source: https://youtu.be/h7baD335hCw?t=598 ... What? Aren't the receive addresses in fact the "public keys"?
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1answer
150 views

Would first-seen prevent a double spend attack?

It takes approx. 8 seconds for a transaction to propagate through the entire Bitcoin network. If we got rid of the concept of replace-by-fee and replaced it (no pun intended) with a first-seen ...
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1answer
38 views

What does bitcoin.org mean when they say about Coldcard Wallet “the final software was not built deterministically like Bitcoin Core”?

I am looking at hardware wallets to store my Bitcoins, and Coldcard Wallet Mk3 seems like a great option. However, at looking at info about it at bitcoin.org, it says that the software is not built ...
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1answer
39 views

Two errors when trying to run make command

I am trying to build Bitcoin Core on MacOs. Followed instructions here https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md When I run make command, I get these two errors 2 errors ...
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2answers
37 views

Can Bitcoin Core be made to display/enter amounts in USD or other fiat currencies?

Every time I need to make Bitcoin payments, I have to switch many times between Bitcoin Core and my separate Bitcoin currency converter. For example, to see how much that transaction fee is in USD. It ...
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1answer
170 views

Recover $220 Million Worth of Bitcoin Locked in a Self Destructing Hard Drive

A NY Times article recently ran a story of Stefan Thomas who has $220 million worth of Bitcoin locked up in an encrypted hard drive: Stefan Thomas, a German-born programmer living in San Francisco, ...
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1answer
80 views

Bitcoin Core v0.21 RPC credentials going bad

I have tried to upgrade to bitcoin core 0.21 but things are not going good. I need some help. I'm using Debian Buster. I was using bitcoin core 0.20.1 before. The folder locations are as I have in my ...
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1answer
110 views

Why do so many Bitcoin wallets and accounts exist?

Why so many bitcoin wallets do exist? Why it is not just single like other conventional currency? Multiple wallets means I have to have multipe accounts; is it possible to transact among multipe ...
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3answers
464 views

ASIC-Resistant Proof of Work

Bitcoin uses a Proof of Work algorithm that makes it the perfect victim of ASIC mining. As a result, it is not very decentralized (more than 50% of Bitcoin's hash power is concentrated in China and ...
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2answers
70 views

1 MB Block Size as a Anti-DoS Attack Measure

Wikipedia explains the rationale behind the 1 MB block size limit as follows: The one megabyte block size limit was added in 2010 by Satoshi Nakamoto as a temporary anti-DoS measure A SE post ...
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1answer
273 views

If pruning is so safe, why aren't 100% of the Bitcoin nodes pruning? Why keep the unnecessary data?

I have a fully synced, non-pruned Bitcoin Core on this computer. I have an almost-fully synced, pruned Bitcoin Core on another computer. What exactly is the motivation for keeping those 368.5 GB of &...
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1answer
428 views

dumpwallet output documentation & explanation?

Where do I find complete documentation on what the console command "dumpwallet" output means? Sample of my testnet output: # Wallet dump created by Bitcoin v0.21.0 # * Created on 2021-01-...
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1answer
74 views

Is my cold wallet still cold?

I created a new wallet.dat on a dedicated, secured machine with Bitcoin Core. Then I encrypted it. Then I sent my "fortune" of coins to it. Then I backed the file up by putting it on all my ...
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1answer
74 views

Isn't an encrypted wallet.dat automatically a “watch-only” wallet?

I have encrypted my wallet.dat outside of this computer. Now I store my wallet.dat on this computer. If I open it in Bitcoin Core, I can view the balance but not spend it (without entering the ...
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0answers
27 views

How do I solve problem of my iMac now refusing to let me access Bitcoin Core?

Immediately after a software upgrade to my iMac, an error message appeared: "Bitcoin Core quit unexpectedly" and I followed the instructions to "reopen" and the error kept ...
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2answers
51 views

What is it about Bitcoin Core that always makes it so “glitchy” and “buggy”?

I've used Bitcoin Core for many years now. Primarily on Windows. While I appreciate its existence, and in many way, it's structured just as I want and expect it (except some really weird stuff which I'...
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1answer
38 views

Why does Bitcoin Core not let met change the label for “requested payments”?

I created a receive address, entered "fdjdsgudhsgudfhgfhdgf" without thinking about it (I was going to describe it properly later) and sent coins to it from a different wallet. Then I later ...
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0answers
14 views

Additional Bitcoins sent during a transaction [duplicate]

Ive spent a lot of time reading threads but can't find anything that matches/explains this transaction that has got me worried: I sent 0.05 BTC from my Bitcoin core wallet to my coinbase wallet, but ...
0
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1answer
51 views

“At first, anyone could spend anyone's coins”?

I've been watching this Bitcoin video: https://youtu.be/ZIugzFygviw?t=294 At the linked-to timestamp, he claims that: Due to bugs, at first, anyone could spend anyone's coins! I'm not saying that I ...
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1answer
91 views

To test if my wallet.dat encryption password is correct, MUST I spend coins?

When a Bitcoin Core wallet is encrypted, you (apparently) have to enter the decryption passphrase only when trying to spend coins. You still get to "use" the wallet as in seeing all the ...
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4answers
141 views

What is the point of “Bitcoin Lightning” and “Bitcoin Liquid”?

Even having been "into" Bitcoin since almost since the start, I constantly find new weird things mentioned which are just apparently taken for granted and exist suddenly and somehow have ...
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1answer
19 views

If bitcoincore.org goes down how can I access it? What can I do to help others access it?

bitcoincore.org is a trusted resource for information on new Bitcoin Core releases and soft fork upgrades. How do I access it if it is taken offline? How can I help others access it if it is taken ...
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1answer
79 views

Why is Bitcoin Core not asking me to enter the decryption key for my allegedly “encrypted” wallet.dat?

I created a wallet.dat with Bitcoin Core on a new PC. Then I encrypted it with the GUI menu. When I reloaded that computer, I was shocked to see that Bitcoin Core did NOT ask me to decrypt/unlock the ...
2
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1answer
156 views

Port Forwarding for Bitcoin Core in order to allow incoming connections?

There is a rather good explainer on https://bitcoin.org/en/full-node#port-forwarding on how to do port forwarding for bitcoin core in order to allow incoming connections so as to support the network. ...
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1answer
59 views

What possible explanation could there be that Bitcoin Core on Linux Mint claims to but does not save the wallet backups?

Linux Mint. Bitcoin Core 0.21.0. I go to "File" and "Backup wallet", then select any location. I've tried with /home/a and /tmp and others. Every time, Bitcoin Core says that the ...
2
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1answer
468 views

Can Bitcoin.org precalculate bitcoin history and distribute it instead of requiring every new user calculate it for hours?

I am trying to set up a desktop client of Bitcoin Core, downloaded from Bitcoin.org. The process requires me to download about 350 GB of data of all bitcoin transactions, but there is an option to ...
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1answer
39 views

Problem with bitcoin-cli -datadir flag

I moved my blockchain directory, including bitcoin.conf, to an external drive D:\Bitcoin. Bitcoin Core starts and runs normally using this path, however when I try to use the command line interface, ...

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