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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6
votes
1answer
708 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 ...
5
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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 ...
5
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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 ...
4
votes
1answer
3k 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 ...
4
votes
2answers
2k 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 ...
3
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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 ...
2
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2answers
1k views

How do I get rid of an unconfirmed transaction on Bitcoin Core 0.14.1?

Can somebody please help me? I have been trying to send .045 Bitcoins (approx $120 USD) I am using Bitcoin Core. I have tried to get rid of the unconfirmed transaction by using -zapwallettxes ...
2
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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 "...
2
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2answers
2k 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 ...
2
votes
1answer
1k 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?
2
votes
1answer
1k 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. ...
2
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4answers
89 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 ...
2
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4answers
1k 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?
1
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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....
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
216 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
1answer
7k 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 ...
1
vote
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-...
1
vote
2answers
145 views

Adding Comment on Bitcoin Transaction (After Sent)

Is it possible to add a comment to a bitcoin transaction after it has been sent?
0
votes
0answers
80 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
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
371 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 ...
0
votes
1answer
1k 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
205 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. ...
-1
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1answer
54 views

What can I expirement with BitcoinCore on my own?

I have a simple faculty assignment where I have to do some experiments with transactions or experiment with the Bitcoin protocol or maybe with wallet code. Work on that assignment shouldn't last more ...
21
votes
1answer
20k 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
4answers
17k 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 ...
17
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2answers
7k views

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

What is the algorithm used for encrypting the wallet.dat file?
17
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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?
16
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, ...
9
votes
1answer
9k 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
220 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 ...
21
votes
3answers
22k 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?
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?
5
votes
3answers
908 views

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 ...
10
votes
2answers
680 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 ...
8
votes
2answers
28k 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 ...
8
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 ...
6
votes
6answers
9k 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 ...
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 ...
7
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
2answers
398 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 ...
6
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 ...
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
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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