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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30 views

Creating bitcoin paper wallets

I'd like to create about 50 paper wallets with $1 worth of bitcoin (or about .000025 BTC) in each one to give away to friends and family to get them into crypto (and also increase my bitcoin knowledge)...
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`addmultisigaddress` syntax for POST request

Copied the body part from https://bitcoincore.org/en/doc/0.21.0/rpc/wallet/addmultisigaddress/ and replaced addresses with 2 new addresses (regtest): POST / HTTP/1.1 Host: localhost:18333 ...
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What is the difference between “difficulty” and leading zeros on a hash? How a mining software works? [duplicate]

I have come up recently with "how to mine bitcoin using python" or "how to mine bitcoin using golang" and as I have been observing all these source code, not only I'm confused but ...
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External USB SSD not recommended for full node?

Peter Wiulle said: Don't use an external drive connected through USB - such hardware is not designed for the kind of heavy database load Bitcoin Core causes. Why is that? Im using a Samsung T7 2TB ...
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What im supposed to do to run Core in airgapped computer?

What do you do? Just open it and leave it trying to sync indefinitely and just use it to create and store keys and sign them? Can I stop it from trying to sync? Also as you sign the unsigned ...
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Front running in Bitcoin

Have you ever witnessed any front-running case in Bitcoin? All front running cases are related to Ethereum smart contracts, auto market makers and uniswap. Thank you
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22 views

Core 0.18 transaction stays in memory pool in own coin [closed]

I build my own crypto coin using core 0.18 (source code from Litecoin) and got the following problem. Everything is working fine I redid the whole process 5 times, but still have 1 problem whenever I ...
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Does anyone have a step by step tutorial in how to use Bitcoin Core in 2 laptop airgapped scheme?

What I mean is, 2 laptops: -laptop 1: Connected to the internet, synced, has watch-only wallets of all private keys to be found in laptop 2's wallet -laptop 2: Never connected to the internet. You ...
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1answer
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Crossing borders: security scheme ideas

More and more airports force you to decrypt your data, they will also dump your stuff keeping a backup. This could happen in just about any border you try to cross. It is only safe to expect this to ...
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3answers
53 views

How to create a Crypto wallet for a start up(Bitcoin and Ethereum)?

I have beginner skills as Full stack Developer and am looking to help developing a crypto wallet with a small start up. The idea is to create a wallet that will store our users cryptocurrencies (with ...
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Finding all BTC transactions from Dec,2017

I am doing a research and for that i need all successful BTC transactions that happened in Dec,2017. Is there a way to download this data ?
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Impact: unknown rules (versionbit 2) have been activated

I have an issue. My Bitcoin Core client shows "Impact: unknown rules (versionbit 2) have been activated". Bitcoin Core made a transaction by itself and sent all my bitcoins from my wallet to ...
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38 views

How to generate multiple legacy or segwit bitcoin address

I would like to generate multiple bitcoin (and litecoin) addresses via Bitcoin Core (and Litecoin Core). I saw this topic How can I generate a large number of Bitcoin addresses? but "keypool"...
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How would I ever know if my solo miner found a block?

I've tried solo mining in two ways: using cgminer, ASIC and ckpool using minerd connected to my own instance of bitcoin-qt. Either way, I've never seen any indicator showing that I have mined 0 BTC, ...
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15 views

Don't know how to sign for this kind of scriptPubKey [closed]

I send a tx to my btc node but catch this error message,I found blow code throw this exception transaction.addSignedInput(outPoint, utxo.getScript(), ecKey, Transaction.SigHash.ALL, true); and the ...
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36 views

Is there no Gmail required to receive Bitcoin payment from another company? [closed]

I don't fully understand how to receive payment, there is no Gmail address space, how can I get my address for business transaction, I mean which address will I use to receive payment?
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1answer
41 views

What happens if a peer doesn't respond to “getheaders” or “getdata” on time?

Suppose a node receives the same "inv" message from many peers. Will the node send "getheaders" requests to all the peers or only one of them? Does the node keep a timer for ...
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Is there a way to list Unspent transactions for a BTC address that is not part of the Wallet, without importing the address to Wallet [duplicate]

Is there a way to list Unspent transactions for a BTC address that is not part of the Wallet, without importing the address to Wallet. I am looking for a rpc function similar to listunspent which is ...
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19 views

Pseudocode for Bitcoin's P2P block propagation

I am going through Bitcoin's block propagation method at https://developer.bitcoin.org/devguide/p2p_network.html Are you aware of any pseudocode available on how blocks are propagated during the ...
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1answer
25 views

Do nodes maintain a download window after the initial syncing?

I was going through the Bitcoin P2P guide. https://developer.bitcoin.org/devguide/p2p_network.html It says that the nodes maintain a 1024-block download window during the initial syncing. However, at ...
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1answer
53 views

How do full nodes get the information about stale blocks?

In Bitcoin, many forks occur when multiple miners mine blocks at the same time. Then there will be multiple blocks at the same block height. I was looking at the Bitcoin P2P developer guide at https://...
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1answer
61 views

Does Bitcoin-core support creating a new Bitcoin blockchain?

My goal is to add a new feature to Bitcoin, which requires changing the structure of the Bitcoin blockchain. So I was wondering if Bitcoin Core supports having a new/own Blockchain? If so, how to do ...
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Generate public addresses (NBitcoin)

I'm trying to generate a public address and for that, I have the code: var key = new Key(); var wif = key.GetWif(Network.Main); Console.WriteLine($"WIF: {wif}&...
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How to my Recover Lost Bitcoin [duplicate]

so i was contacted by this broker who invited me to invest in a bitcoin mining website, i did got through documents and all and there seem legit, so i invested 35K USD and after 3 weeks my profit ...
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What will be the impact of Pegasus spyware on cryptocurrencies? [closed]

A few days ago, I asked a question about the servers being infected with a virus, and my question was closed. In less than a few days, all the media is talking about a spyware called Pegasus. The ...
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Why does Bitcoin Core support a transaction index but not an address index?

Bitcoin Core has the CLI option -txindex to maintain a full transaction index for RPC calls. That sounds useful for some use cases, like for a blockchain explorer. It seems perfectly logical then that ...
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SPV wallet connecting to personal bitcoin node

I have decided I want to run a bitcoin node both to support the network, learn more about how it works and also so I can participate while minimising trust in external parties. I have a bitcoin core ...
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Regtest at height 120k took 600ms to generate a block

Just doing while : do time bitcoin-cli generatetoaddress 1 <non_local_wallet_address> bitcoin-cli getblockcount done brings regtest blockgen times up to 600ms when generating a block at the ...
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20 views

If I plug a node into another computer does it have to reindex?

imagine you have a Bitcoin Core node synced 100% working fine, its installed in a portable SSD on your laptop. If you want to use this SSD on your desktop, will it boot normally or will it go throught ...
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1answer
53 views

Bitcoin BTC wallet receive addresses

I want to create 100 to 500 to 1000 BTC receive addresses. It should not expire. Is it possible ? Is it possible in Bitcoin core ?
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Which wallets support French seed-phrases? [duplicate]

I found an old backup seedphrase but it is has French words in it, and I've been struggling to find wallet to restore it as it seems most wallets support only English. There has to be a wallet that ...
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How safe it is to store keys in Electrum? I think Luke Dash JR didn't recommend it

I agree with Luke Dash Jr and in general this wiki with the fact that doing anything without a full node is a mistake: https://en.bitcoin.it/wiki/Clearing_Up_Misconceptions_About_Full_Nodes But my ...
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1answer
81 views

How to use Bitcoin Core as a wallet without leaving no traces that used the wallet?

is it possible to open a wallet file, do transactions and anything you need, then backup the file inside a veracrypt container, move this file elsewhere outside of the drive running the full node and ...
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Does Bitcoin Core install well in PureOS following this tutorial?

I would like to install Bitcoin Core in PureOS distro. I was going to follow this tutorial: https://www.youtube.com/watch?v=lmMVoBgIzNc Will this work or do I need to take additional steps, like ...
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1answer
56 views

Bitcoin HD Wallet using C#

What packages do I need to use for creating Bitcoin HD Wallet in C# using BIP44? How can I connect to a remote Bitcoin Node to read all the deposit transactions received by various child addresses in ...
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I am working on a Bitcoin HD Wallet implementation in C#, Trying to build a HD Wallet offline for subscribed users following BIP44

I am working on a Bitcoin HD Wallet implementation in C#, Trying to build a HD Wallet offline for subscribed users following BIP44. Is there a way use a remote node for looking at the Received ...
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1answer
40 views

How to use Bitcoin Core on a laptop as a hardware wallet [duplicate]

I would like to have the following setup: Bitcoin Core on an offline laptop. Here the private keys are stored. Full disk encryption. Bitcoin Core on an online laptop. Here watch-only addresses from ...
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1answer
251 views

What is `ping` RPC used for?

ping doesn't return anything so what is it used for? If a user wants to ping and check ping time for all peers, getpeerinfo can be used.
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1answer
208 views

Bitcoin alpha version with 15 minutes block time interval

In alpha software prior to Bitcoin's release, the target interblock interval was 15 minutes, and it was reduced to 10 minutes for release. https://www.reddit.com/r/Bitcoin/comments/56nk94/...
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1answer
105 views

Does Bitcoin Core have/need an archive mode?

Similar to Ethereum's Archive Node: Stores everything kept in the full node and builds an archive of historical states. Needed if you want to query something like an account balance at block #4,000,...
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1answer
75 views

Why i can still use the 'generatetoaddress' RPC with custom signet?

I have set up my custom signet, with my own challenge. I expected to fail to generate blocks using the 'generatetoaddress' API before importing the private key related to the challenge script in the ...
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28 views

Can you prune blockchain without redownloading?

I've downloaded the whole blockchain now I want to run a pruned node on another device. But if I klick on prune block storage in bitcoin core, it tells me that reverting this setting requres re-...
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What is upgrade fee in trading?. Is it necessary to pay? [duplicate]

I trade in standard crypto trading.. initially I trade for $100.. After they asked me to pay $300.. And said then only I can receive my profit.. after they said trade completed.. and I received profit ...
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Had a question on using on-Chain Data(Glassnode) to measure Unrealised/Realised profit and loss of BTC holders - isn't on-chain data not complete?

https://twitter.com/Negentropic_/status/1408436526262988801 The link above shows this tweet and pic: Isn't on-chain data not the full universe of transactions? for eg. Example 1: we have 10 users ...
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1answer
121 views

What are the upcoming scaling and privacy improvements for Bitcoin past 2021?

Taproot is coming in 2021-Nov, but its been worked on for the last couple of years. What are upcoming improvements to Bitcoin that are just being talked about or being tested?
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50 views

How can I find Miners' Wallet addresses?

Is there any way to find miners' wallet addresses in Bitcoin Blockchain? I would like to find transactions that are related to the miners themselves. Thank you in advance.
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923 views

How can someone steal bitcoins and hide it?

I just read that someone did steal 69000 bitcoins and 'vanished' with it. But how it that possible? As far as I know, the complete chain of transactions is always visible to everyone. So at any given ...
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Major changes to Bitcoin since original paper

Is there a history of the major changes/additions (as well as perhaps major proposals) to Bitcoin since the original paper by Satoshi? I realize of course that one can read through the BIPs and ...
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2answers
67 views

Merkle tree hash - Computing hash manually doesnt match the one computed by SHA256D64

I am trying to go through the code to check the merkle tree hash computation done by BlockMerkleRoot in bitcoin core. The hash computed using online tools by appending transaction hashes is different ...

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