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.

Filter by
Sorted by
Tagged with
1
vote
3answers
2k 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, ...
1
vote
1answer
134 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, ...
1
vote
2answers
67 views

Adding Comment on Bitcoin Transaction (After Sent)

Is it possible to add a comment to a bitcoin transaction after it has been sent?
1
vote
1answer
6k 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 ...
0
votes
1answer
149 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. ...
0
votes
0answers
46 views

Missing btc after -zapwallettxes and blockchain rescan

I sent a transaction in Bitcoin Core and realized that the fee was too low. I waited a few days to see if it would confirm and then wanted to try something else. I read that starting bitcoin core with ...
0
votes
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....
0
votes
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 ...
0
votes
1answer
876 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 ...
0
votes
1answer
342 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 ...
21
votes
1answer
19k views

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 ...
11
votes
5answers
3k views

Merkle Root and Merkle Proofs

This is one of those questions that everyone seems to write about but the same bad explanations are just plagiarized from site to site. Edit: The heart of my question is why Merkle trees are claimed ...
21
votes
3answers
18k views

How to send bitcoin with a message attached

Is it possible to send bitcoins with an attached message with the transaction? If yes how to do it?
17
votes
2answers
13k views

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?
17
votes
2answers
6k views

How does the Bitcoin client encrypt the wallet.dat file?

What is the algorithm used for encrypting the wallet.dat file?
17
votes
1answer
4k views

Migration from Berkeley DB to LevelDB

In 2013 a new bitcoin core was released and one of the supposed improvement was migrating from Berkeley DB to LevelDB. According to the release notes at bitcoin.org: LevelDB, a fast, open-source, ...
10
votes
4answers
15k views

A complete bitcoin implementation in Python?

I recently became aware that python-bitcoinlib is not a full bitcoin node implementation, but rather a set of tools to work with bitcoin-core cpp. I would like to know whether there are some ...
8
votes
1answer
8k views

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/...
3
votes
1answer
200 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 ...
12
votes
1answer
1k views

Where in Bitcoin Core does it do X?

Note that this is a general question and answer designed to serve as a guide for finding things in Bitcoin Core. Where in Bitcoin Core's source code does it do X? How can I find that code by myself? ...
10
votes
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 ...
5
votes
2answers
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?
10
votes
2answers
669 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 ...
9
votes
1answer
2k 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 ...
3
votes
1answer
3k 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 ...
2
votes
3answers
2k 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: ...
13
votes
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 ...
12
votes
2answers
1k views

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 ...
8
votes
1answer
7k views

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 ...
7
votes
1answer
2k 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 ...
7
votes
2answers
24k views

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 ...
6
votes
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 ...
6
votes
2answers
4k 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 ...
5
votes
2answers
1k views

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 ...
4
votes
1answer
924 views

What does “NODE_WITNESS (12)” mean as it is shown in bitnodes.21.co?

I'm running a pruned full node of bitcoin core version 0.14.0 and checking on https://bitnodes.21.co/nodes/ I can see that my node was labelled "NODE_WITNESS (12)" unlike of the others nodes shown, ...
4
votes
1answer
278 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 ...
4
votes
1answer
3k 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 ...
3
votes
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 ...
3
votes
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 ...
3
votes
5answers
397 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 ...
2
votes
2answers
7k 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 ...
2
votes
1answer
263 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 ...
1
vote
1answer
1k views

How to create a blockchain snapshot for a hardfork?

I've done source forks (altcoins) and I understand how those work. But I'm a little stuck on how forks are activated? I need to know how blockchain snapshots are created and how the wallets know to ...
14
votes
5answers
651 views

Why does the standard Bitcoin client not display the balance per address?

Any Bitcoin wallet holds several bitcoin addresses. Such addresses are either generated manually from the GUI addressbook or automatically collecting the "change" of a "Send" transaction. The total ...
13
votes
2answers
293 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 ...
12
votes
3answers
14k views

Where can I access the original, Satoshi written Bitcoin code?

The articles of https://bitcointalk.org/index.php?topic=41718.0 seem to be annotated walkthroughs, and I'd like to see the raw code, as it was originally written in the first release.
9
votes
2answers
2k views

What exactly is checked at various -checklevel's?

The standard bitcoin-qt/bitcoind client has an option -checklevel which purports to perform various checks on the block data stored on disk. Is there current documentation (other than the source) ...
7
votes
2answers
6k views

What does “Activating Best Chain” mean?

What does "Activating Best Chain" mean? My Bitcoin Core doesn't freeze, it just takes a while. I'm curious as to what it's doing.
7
votes
2answers
9k views

To run bitcoin core testnet on Ubuntu 16.04

How can I run Bitcoin core testnet version on ubuntu 16.04 platform ? I am getting so many reference about how to run bitcoin core mainnet but it will take around 20 days to synchronize with the ...
6
votes
1answer
261 views

What is the formal code review process of the standard client?

There are n developers with commit privileged. After one of them merges a pull request, how many eyes review that code? When? Is a complete (holistic) code review done before releasing a version? ...