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
171 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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2answers
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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
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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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1answer
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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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497 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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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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1answer
400 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
225 views

Transaction still unspendable with CLTV

Previously I generated tx with CHECKLOCKTIMEVERIFY Here is the transaction https://tchain.btc.com/bb1415c166fd9f767c06d34d539f4b110ef4445f74a76c5ffad1ded33032e872 It lock funds before block 1442909. ...
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1answer
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How genereate pub key from priv key ? algo

How to generate pub key from prive key ? All examples and explain skip this. but i dont need steps to address etc . i only need steps from priv to pub ( compressed or not ) what using at that. if ...
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1answer
162 views

Why doesn't Bitcoin-Core support Lightning Network? [closed]

I first learned about Bitcoin in 2009. Ever since, I've (very) slowly pieced together information, while shaking off 99% disinformation, about how Bitcoin works. I run a Bitcoin Core fullnode and have ...
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1answer
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What's the difference between bitcoind and bitcoin-qt? Different commands?

This is a multi-part question, mainly do to contradictory information from different articles. It's got me all confused. From my understanding, bitcoin-qt is just a GUI version of bitcoind - which ...
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2answers
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Should I be running Bitcoin Core or Bitcoin-XT?

I just read about Bitcoin Core and Bitcoin-XT, and I want to know what is the difference between Bitcoin Core and Bitcoin-XT? And which is better Bitcoin Core or Bitcoin-XT?
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2answers
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How does the Bitcoin client encrypt the wallet.dat file?

What is the algorithm used for encrypting the wallet.dat file?
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1answer
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What exactly did `Bitcoin-Qt -rescan -reindex` do?

I spent a ton of time today trying to get Bitcoin-Qt to sync using the bootstrap.dat file and could not get it to work. I found an answer on this forum saying to use: /Applications/Bitcoin-Qt.app/...
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3answers
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How to receive payments online to single address per user in scalable way?

Suppose we are building online casino/market and want to receive payments. To be scalable, safe and have good user experience, we: cannot generate new address for every single payment. Having single ...
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1answer
252 views

Can a bitcoin cold wallet become incompatible

(newby-question) If I plan to use a cold wallet for longterm storage without following the news around bitcoin and my cold wallets application does not get maintained anymore in the meantime, can it ...
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1answer
1k views

Since Bitcoin Core 0.14.0, how does a node with default settings compute the dust limit?

In earlier releases of Bitcoin Core, the dust limit was defined as an output whose spending would require more than 1/3 of its value as fees: https://bitcoin.stackexchange.com/a/41082/10845 The ...
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How do I get my public address in Bitcoin Core?

In a world of pain at the moment. I downloaded Bitcoin Core, and before I realised I'd need the complete downloaded Blockchain, my friend transferred some coins to my address. I did some research ...
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106k views

Where can I see my Bitcoin address?

I use the original client, but I don't know where can I find my Bitcoin address. Can someone help me?
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1answer
3k views

Cannot mine Genesis / First Block (PIVX Fork / Clone) [closed]

Whatever I do, I am unable to mine the 1st block after the genesis block. All the while, I have assumed that I have mined the Genesis block, and I am unable to mine the 1st block using "setgenerate ...
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703 views

Why don't developers switch from bitcoin-qt to a cleaner implementation?

The "reference client" bitcoin-qt receives a lot of complaints from developers on the messy way it was coded. It seems to require a big overhead to learn, and a lot of time is being spent on ...
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1answer
3k views

Easiest way to control a remote bitcoind instance?

What's the easiest way to control bitcoind running on a remote machine? I'd like to make transfers, manage my wallet, etc, and ideally I'd like to do it using a UI such as bitcoin-qt. Unfortunately ...
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1answer
3k views

Why Bitcoin core creates time locked transactions by default?

I've noticed recently that Bitcoin Core is producing transactions with non-zero lock-time and sequence numbers of inputs being 0xFFFFFFFE, even though I didn't instruct it to do so. The lock-time ...
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2answers
7k views

How to verify Bitcoin Core Release Signing Keys

I use Gpg4win but I don't know the step to verify the Bitcoin Core Release. can you give me the instruction how to verify released? i git this resolte C:\WINDOWS\system32>gpg2 --keyserver pgp.mit.edu ...
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6answers
10k views

How to get unspents for a specified bitcoin address?

I want to access unspent data of a specific bitcoin address. I am trying this command bitcoin-cli -regtest listunspent "some bitcoin address" But I am always getting an empty list. I am using local ...
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2answers
4k views

How to use Bitcoin Core's submitblock method

I'm trying to understand how mining works. For learning purpose I'm using Bitcoin Core as solo mining pool. Getblocktemplate will return data that is enough to start mining witch is simple founding ...
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3answers
3k views

Calculate Segwit address from public address

I would like to calculate the segwit address of a public address. First step: take the compressed public address: 1L88S26C5oyjL1gkXsBeYwHHjvGvCcidr9 do a sha256 on that address: ...
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1answer
890 views

How does the bitcoin exactly prevent Double spending attacks?

I recently started reading about Bitcoin, the idea seems hard to get, and I'm trying to understand the basics now. I read the white paper by Satoshi Nakamoto but I still have some confusions First, ...
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2answers
323 views

What are the privacy implications of filtered blockchain downloads?

There is now "Bloom filter" support in the network protocol for sending only relevant transactions to lightweight clients. What are the privacy implications of the bloom filter? Does it leak any ...
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4answers
1k views

Is pruning transaction history implemented in Satoshi's bitcoin client?

The original bitcoin paper suggests a method to discard old transactions. One should compute the Merkle Tree of the entire transaction history, and store only part of the tree. However, I didn't ...
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2answers
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How can I choose the address bitcoins are sent from?

So let's say I have multiple bitcoin addresses (some of them already received bitcoins), created a new bitcoin address, received bitcoins on it and would like to use the very same address to send them ...
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1answer
1k views

UXTO DB structure

After update Bitcoin Core to version 0.15, chainstate database changed format of data. Old prefix of key has been 0x63, now 0x43, and key/value are different Where is the new format described, or ...
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1answer
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Installing Bitcoin-Qt on Ubuntu

I am using Ubuntu 11.10. I have downloaded Bitcoin-Qt, but I don't think it has installed itself. The instructions say "download and install" the software, but I'm afraid I need instructions that are ...
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2answers
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Why is it harder to compute nonce for a hash with a certain number zero prefixes than it is for any other hash?

Based on my rudimentary understanding of Bitcoins and altcoins, network difficulty is adjusted by asking the network to target a hash smaller than a specific number, which translates to calculating ...
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2answers
637 views

Configure esplora to point to the bitcoind servers ip address

I have 2 servers running: Ubuntu 18.04 running bitcoind daemon (v0.18.1 full blockchain synchronized) Ubuntu 18.04 running esplora (the local single page website works, but it has no data from the ...
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1answer
1k views

What is “Key Splitting”? When would I use it?

Here is some github code to create split keys. Is Key Splitting the same as Multi Sig? What are the benefits of Key Splitting, what's it used for? How does it relate to P2SH or any other relevant ...
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1answer
222 views

How does Bitcoin Core know it's on the longest chain?

In trying to implement a client, I am wondering what is the most efficient approach to figure out if you are on a fork. Let's say you pick a peer at random and go through IBD using the headers-first ...
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2answers
5k views

How does the signature verification feature in bitcoin-qt work without a public key?

bitcoin-qt has a "signature verification" feature where you can verify a signed message. All it needs is the bitcoin address of the signer, the message and a short signature. From what I understand ...
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1answer
4k views

How does Bitcoin keep track of account balances?

I downloaded the latest bitcoin client and am waiting for it to connect. How does it remember how much money a person has? Do I create an account and the balance is associated with the account each ...
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1answer
306 views

Bitcoin Cold Storage Question

I am ready to put some of my BTC holdings into a couple different cold storage wallets. I went through the process already moving around a few mBits as tests, created the keys on an offline PC, sent ...
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1answer
419 views

Is BIP 32 Technology Cryptographic Curve Agnostic?

Does BIP 32 always implicitly assume secp256k1 elliptic curve cryptography (ECC) is to be applied, or can BIP 32 technology also be applied to create extended public or private keys that can readily ...
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3answers
2k views

How can I tell if bitcoind was compiled with ZeroMQ support?

Question How can I check to see if ZeroMQ is not active due to a config error or due to lack of support at compile time? Details I'm seeing a lot of messages like this from the insight logs: [2017-...
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2answers
2k views

How to get a history of incoming and outgoing transactions for a certain address?

Along with the history of incoming and outgoing transactions, how would I find the first block that that address appeared in (to find when the wallet was created)? I want to do this by parsing with ...
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5answers
408 views

As a small hotel accepting bitcoins, do I show only one payment address?

I am currently accepting bitcoins as payment at my hotel, but I am uncertain about the payment address(es). I prefer to avoid payment service such as BitPay and Coinbase to mention a few. At this ...
3
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1answer
538 views

How to handle incomplete blocks when reading blk*.dat files?

I'm trying to write a parser for blk*.dat files from scratch. Right now, I can read blocks, extract the header fields and calculate the correct block hash based on the header fields. I just tried to ...
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1answer
2k views

How to access any transaction detail in Bitcoin version 0.8 and above?

Since the Standard Client version 0.8 removed the full index of all historical transactions, some Bitcoin applications that relied on that functionality have stopped working. For example, one is no ...
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2answers
7k views

Create a raw transaction and broadcast it to blockchain using bitcoin core

I have a address- n3xYQtxvVwpBPSbgGsGRdMWz1YTUjakiMV, amount that i want to send-1 BTC and i have a private key. How can i create a raw transaction using it and broadcast it to blockchain using ...
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1answer
612 views

What is the length of largest known reorganization in bitcoin? [duplicate]

Usually there is an assumption, that a transaction is fully finalized after 6 confirmations, e.g. 6 blocks mined on top of the block, which includes given transaction. What is the length of largest ...
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2answers
9k views

How to export public key for an address in bitcoin-qt?

With the probable increase in demand for multi-sig (P2SH) addresses, and since the procedure for creating such addresses requires that each participant provides the uncompressed public key for an ...
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2answers
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Pros & Cons of Self Hosting Bitcoin Node vs using a 3rd Party Service?

We are a medium size company building a blockchain application that requires us to interact with the Bitcoin blockchain (+ several other cryptocurrencies). One option is for us to use a 3rd party ...

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