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
35 views

How to Create or Generate a New UTXO in Bitcoin Core?

I know how to use Console in Bitcoin Core but not that expert. I would like to ask is there possible for me to generate or create a new UTXO in Bitcoin Core? All I have with me are the list of TxID ...
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1answer
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IP Addresses of inbound connections in bitcoin full node (TOR) looking as a localhost (127.0.0.1)

I run bitcoin full node (mynode) through TOR and I see that inbound connections appear only as a localhost with varying ports usually in high range (examples 127.0.0.1:35010, 127.0.0.1:58188, 127.0.0....
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2answers
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Stopping bitcoind on mac

One of my kids while learning more about bitcoin started bitcoind on my mac. Now I am unable to stop it. In my activity monitor, it shows a process named "bitcoind". I have stopped that ...
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1answer
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Need Help about Console in Bitcoin Core

I would like to ask the following. I've downloaded Bitcoin Core and just start using their "Console". Before I can createrawtransaction, I need to first set up a node in Bitcoin Core, right? ...
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1answer
57 views

How to run Bitcoin Core as onion service on Windows, Ubuntu and Android?

Have you tried running Bitcoin Core listening on Tor on different platforms? What are your experiences, issues that you faced, hacks, workarounds etc.?
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Why does estimatesmartfee and walletcreatefundedpsbt with conf_target show a wide disparity?

Seems that when my testnet node boots up estimatesmartfee works just fine generally: {"jsonrpc":"1.0","id":"curltest","method":"estimatesmartfee&...
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1answer
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Importaddress and conf

I'm wondering if its possible to add imported addresses into the bitcoin conf file. So, rather than calling the cli with importaddress, I would add the address to the conf file, with say, ...
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0answers
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How can I see a non-wallet transaction in Bitcoin core [duplicate]

If I run the command gettransaction "txid" in Bitcoin core with a transaction id that doesn't belong to my wallet, I get "Invalid or non-wallet transaction id (code -5)". I can see ...
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1answer
167 views

Securely erase a previously used address from bitcoin-core

I'd like to completely delete an address from bitcoin-core, in such a way that someone who obtains all the data on my computer could not find out I ever used that address. Is it enough to delete ...
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1answer
34 views

Calculate block hash is different in regtest?

I'm able to calculate the block hash in mainnet and testnet, but I don't get the right hash in regtest. I mint +3000 blocks and I get the block with height 3000 bitcoin-cli getblock $(bitcoin-cli ...
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2answers
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When I try to download Bitcoin Core on MacOS it says “Apple cannot check it for malicious software”? Is it safe to download?

Brand new Mac Mini, latest macOS Catalina (10.15.6 (19G2021)), followed instructions on bitcoin.org download page. Double click Bitcoin Core.app, and I get: “Bitcoin Core.app” can’t be opened ...
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BTC sent to multisig address, but no info about this in bitcoin core (listsinceblock, getwalletinfo, listunspent)

I sent BTCs (testnet) to multisig address: address: 2N8yzozJh1DFgrnND7TbSbuSQ1NPA8byQDu transaction: 2453fe904b74acbbf541f98d2d5a1d7a509457a3df10bf38d0c3cb9326734dcd But my bitcoin core does not ...
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1answer
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restore wallet using hd seed before 0.17.0

Hd wallets are supported from v0.13.0. Currently it is easy to save hd seed and restore a wallet from it (due to changes in v0.17.0 and v0.18.0): dumpwallet (read hdseed from it) createwallet (blank ...
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1answer
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how to get a seeed wallet in bitcoin-cli? [duplicate]

hi how to get a seed wallet in bitcoin_cli ? I use a bitcoin-cli sethdseed but error :invalid private key please help me
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Study bitcoin core source code

I have read a lot of documentation and books where they explain the general functioning of Bitcoin and I think that the time has come to study the source code of Bitcoin core. I have knowledge of c++ ...
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using -reindex-chainstate in the cmd

I have a problem with my full node bitcoin core, it was working fine, and after restarting my computer, it shows an error with reindex So to solve the problem i usedreindex-chainstate Is it normal if ...
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Error opening block database Full node

For some reason my node shutdown and now I get when restart it Error opening block database here my bitcoin.conf txindex=1 reindex=1 reindex-chainstate=1 # Accept command line and JSON-RPC ...
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1answer
56 views

Where can I find the core binaries for v.0.1.5 to v.0.3.21?

I have been looking for core binaries (i.e. win32-setup.exe & win32.zip & macosx.zip) for earlier clients. Any advice on where they are hosted? They have all been removed from SourceForge. ...
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1answer
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How do merkle trees ensure credibility to blockchain, when full node wrongly denies a presence of a txn in a block?

How can Merkle Trees ensure that a full node doesn't lie to a thin node that a txn t is not present in a block B if infact B contains t? How can a thin node tell if the full node is lying if the full ...
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1answer
40 views

Does Bitcoin Core validate signatures by default?

There have been claims recently of Bitcoin Core not validating the signatures in a block by default. If this is true, can Bitcoin Core even claim to be a full node?
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bitcoind: How to get rawblock data with ZeroMQ

I am trying to use the zeromq api for bitcoind to get rawblock but its not working with the code I've provided below. I am able to get hashtx and rawtx if I remove the filter but not hashblock and ...
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1answer
177 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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0answers
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Does the mempool size as reported by Blockchain.com include the size of txs only?

Does the mempool size as reported by (for instance Blockchain.com) include the sum of the 'size' of transactions only? Or does it also include the overhead (due to indexes, allocation overhead, ...
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1answer
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How to realize dependent transactions seating in the Mempool?

I am trying to find out the relation among dependant transactions in the Mempool. I have already used the "depends" field and tracking the transaction ids to go through. but I still can not ...
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3answers
47 views

How exactly does “CoinDance” determine the current number of public Bitcoin nodes?

On this URL: https://coin.dance/nodes It says how many public Bitcoin nodes are currently active in the world, and how many Bitcoin Core ones. While it's good that I can grab these numbers from that ...
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1answer
32 views

Bitcoin Core Address

Hi how can I look up my bitcoin-core address. I have generated multiple addresses to received bitcoins but when I look them up in a bitcoin explorer they do not show the balance I see in bitcoin core. ...
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1answer
49 views

Bitcoin Core private key import

I would like to import the private keys from a multisig paper wallet to Bitcoin Core. My aim is to convert the paper wallet to an electronic wallet and to be able to export the corresponding wallet....
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1answer
32 views

How is a multisig transaction transferred between multiple signers?

I'm trying to learn more about doing multisig transactions. The examples I've seen show the signing of the transaction with 2-of-3, or 3-of-3, where the signatures are added, essentially, at the same ...
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1answer
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Does testmempoolaccept check all possible rejection rules?

Is there any rejection rule that testmempoolaccept will not check, or is it safe to assume that if it passes testmempoolaccept validation it will be at least broadcast? Mostly concerned about complex ...
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0answers
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How to import multisig private keys

I've been trying to import my multisig paper wallet to Bitcoin Core. I am in possession of the private keys and the redeem script. The private keys are in uncompressed WIF format (i.e. start with a '5'...
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2answers
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How to raise the bad-txns-vout-negative error?

I wanted to replicate the bad-txns-vout-negative error scenario. I tried the following but getting 'Amount out of range' only: Here is the command i tried: bitcoin-cli -named createrawtransaction ...
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1answer
87 views

How can I verify the BTC supply with my own node?

With all the supply talk going on I wanted to verify the active supply on my new node I got. What is the best way to "run the numbers" I am running a raspiblitz node.
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Are there any good websites to recommend? thank you [duplicate]

Knowledge about Bitcoin, as a beginner, what to learn. Is there a good website to recommend? About bitcoin.
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1answer
27 views

Using maxuploadtarget in Node Window Console

Complete first-timer to setting up my own node here... I’ve got as far as downloading and syncing the node (on Windows PC), getting my router and anti-virus ports sorted, but want to limit my upload/...
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2answers
406 views

What exactly does the scary option “Allow incoming connections” do in Bitcoin Core?

Software authors seem to enjoy consciously freaking me out by having vaguely or entirely uncommented options in their software with very ominous labels. In Bitcoin Core's settings, it says "[X] ...
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0answers
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How to transform mnemonic to hd seed accepted by Bitcoin Core [duplicate]

How to transform mnemonic to hd seed accepted by the sethdseed command? Thanks
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0answers
29 views

How to setup hd wallet using mnemonics with bitcoin-core? [duplicate]

I'm currently learning Bitcoin wallets using Bitcoin Core, and I need some guidance and help especially when it comes to mnemonics and hd seeds. This is what I have read about mnemonics and seeds: bip-...
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0answers
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Is there actually such a thing as “blockchains” being used right now for actual things? [closed]

In the last few years, I've heard "blockchain" and "blockchain 2.0" and many other such buzzwords repeated so many times that I'm beginning to wonder if I've missed out on ...
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1answer
27 views

Is there any way to replace “move”?

The "move" command can't use because the account system is gone. So, Is there any way to manage my coins, address, wallet with no fee like "move"? Pleas let me know. :(
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1answer
185 views

Using bitcoind, is it possible to set a specific fee with sendtoaddress?

For example, setting the fee to exactly 1000 sats or 300 sat/kw?
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1answer
31 views

Questions about sendmany json-rpc

1 - Whats is the limit for sendmany? 2 - Can i batch a large number of payments (several hundreds)? 3 - Does an error in processing any address would interrupt the whole process?
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1answer
28 views

What's the best strategy to send btc from one wallet to a address list with transaction id for each payment?

I'm triyng send a mass btc payment, but using "sendToAddress" i'm limited send a new transaction only when the last was confirmed, if i try send when the last was pending of confirmation i'...
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2answers
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About Bitcoin Core

I have just downloaded the Bitcoin Core from https://bitcoin.org/en/download I would like to ask the following since I have read the following article: https://blockgeeks.com/guides/best-bitcoin-...
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1answer
76 views

Wallet.dat Bitcoin core Privatekey Recovery

Is there any method from which we can manually calculate wallet privatekey from a protected bitcoin core wallet.dat file ? I was searching on it and find this , I think it is related to my topic https:...
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3answers
53 views

Is there really no manual for Bitcoin Core?

This is not the first time I'm desperately searching for Bitcoin Core help and finding none, but look at this: https://bitcoincore.org/en/doc/0.20.0/ That's the closest thing to a "manual" I ...
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1answer
142 views

How does nix-bitcoin provide greater security for installing Bitcoin nodes?

nix-bitcoin claims on its GitHub repo to facilitate the installing of Bitcoin nodes and higher layer protocols (e.g. Lightning) with increased security? How does it do this? [edit: as RedGrittyBrick ...
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1answer
32 views

How safe is BitcoinCore since it is using owner's passphrase?

When I want to create a wallet with BitcoinCore by going File->Create wallet, it asks me to choose a passphrase for it. Over the mouths exploring Bitcoin I learned that it is very unsafe to use ...
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1answer
51 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 ...
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2answers
38 views

Can you run a full Bitcoin node on Node.js?

Are there bitcoin full node implementations running on Node.js? Node.js is the server side language that I'm most familiar with so I was wondering if I can run a full bitcoin node on Node.js? I just ...
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1answer
47 views

How does a full node decide which outbound peers to have?

I understand that a full node can have up to 10 outbound connections (8 full relay peers and 2 block-relay-only peers). I wonder how my full node decides which nodes to connect to for outbound. What ...

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