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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1answer
224 views

Manually create a transaction to spend the output of a P2SH tx

I want to manually create a transaction to spend the output of a P2SH tx, but I don't know where the redeem script should be placed in the new transaction? I followed an online tutorial Building a ...
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0answers
10 views

How can I use backup up chain data from pruned node to set up (archivial) node without IBD?

My setup is an old (~2012) laptop + small SSD and a NAS with HDDs. I noticed that trying to sync Bitcoin Core (v0.18) on the NAS was slow, but on SSD was very fast. (Everything is connected via ...
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1answer
21 views

Bitcoin 51% majority miner attack - question on the role of user activated soft forks as defense tactic

If one mining entity has alone 52% hash power of the overall network, then this party can block transactions for example and try to "build" up a forked, longer chain while time passes, right?. As I ...
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2answers
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how to fix Bitcoin core 14.2 on Windows 10 Home 64bit ver.

I cant install Bitcoin Core 13.2 thru 15.01 64 bit on my window 10 64 bit system it worked ver 14.2 worked before I tried to sign into coinbase that emailed me an address that needed to Identify my ...
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Why hasn't cold storage (offline signing) been supported by Bitcoin Core (GUI) up till now (0.19.0.1)?

Is there any deep reason not to support this? Or is this merely a "good idea, but no volunteers" situation? By the way, although Bitcoin Core had supported BIP32 several years ago, it uses hardened ...
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2answers
27 views

full node bitcoin, l have a 32 bit pc,can I run a node with an SSD?

full node bitcoin I have a 32-bit Windows 7 PC, can I run a node with an SSD?
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1answer
20 views

Where can one download the legit copy of bitcoin core software with hashes to verify?

Where can one download the office bitcoin core software? The bitcoin software that everyone is using. Just typing in "download bitcoin" in google, its quite confusing for newbies as you have bitcoin....
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2answers
129 views

Is it possible to generate(mine) a block with specific transaction via bitcoin-cli on regtest?

I want to generate a block with specific transaction via bitcoin-cli on regtest. The "generate" command does not have the option. It collects transactions in mempool by the default rule. I guess I ...
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1answer
197 views

How to retrieve transactions in realtime from bitcoind .dat files

I want to get all the data from blocks as they get updated on my local node. Abe offers very poor performance, and fast-dat-parser creates other .dat files and doesn't have enough documentation for me ...
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1answer
27 views

When does a miner get the reward?

Let's suppose that a miner mines a block and adds it to the blockchain. When it gets the reward ? I suspect that first of all the other nodes have to verify that its proof of work is correct and it's ...
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1answer
772 views

Run bitcoin-qt at startup of Windows server

I am running bitcoin-qt on my server. I use .Net library to query it through windows services. It all works when I start bitcoin-qt manually. But if the server is restarted, I see that it is running ...
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1answer
79 views

Create a Double sha256 block and trandaction

I have same problem whit create a double sha256 of the transactions and blocks with C++. The hash block it is created with the concatenation of these data, version + previusBlock + merkleRoot + ...
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1answer
175 views

HD wallets and multisig

Is there any standardized way to define HD wallet accounts used to participate in multi-signature transactions? How do existing multisig wallets derive their keys from the seed it? How is Bitcoin Core ...
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1answer
1k views

How to build Bitcoin binaries for Windows on Ubuntu using cross-compile

I am trying to build Bitcoin 0.13 for Windows. I've always used this guide for building previous versions. Now seems that developers have changed their mind regarding Windows, and the new way seems ...
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2answers
35 views

bitcoin back-end blockchain storage

bitcoin uses blockchain so blockchain is peer to peer, every peer stores the data so I wonder where does the data of all the bitcoins is stored? who is peer in case of bitcoin? so that peer gets ...
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1answer
34 views

Wallet Recovery with Bip39 Seed

From having a list of bip39 seeds, is there any way of recovering a wallet? In particular, I have a list of ~100 seeds--one of which is mine--and need an automate way of figuring out which is valid ...
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1answer
26 views

Bitcoin core v0.19.0.1 automatically prunes?

Just finished syncing the whole blockchain after days and I realize the bitcoin settings were "pruning", which means I cannot use it as a wallet. is it the normal behavior of bitcoin core v0.19.0.1 ...
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16 views

How to set up a private Bitcoin network with low mining difficulty

I wish to set up a two-miner private bitcoin network. The miners need to compete for the hash power and the block generation interval is also set to be 10 mins. I found some tutorials about regtest ...
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0answers
27 views

I need someone who can help me acces my bitcoin address [closed]

Please I lost asses to my bitcoin private key and any white hat hacker to help me get it back
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1answer
336 views

Need help to understand where bitcoin transaction has gone

I am new with bitcoin and I need some help from experienced members. I have a server with bitcoin core where we accept some payments and use bitcoin core as mercant. The problem is that we have got ...
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2answers
85 views

What meanings do the “NodeId”, “Version” and “Services” convey on Peers tab of Bitcoin-qt Debug window?

As shown in the picture, Is "NodeId" the ordered number (among all the existing bitcoin-core nodes) of the node that I am connected to? How does "Version" differ from the "User Agent" version (on ...
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1answer
133 views

Security implications of bitcoin.conf location

I'm setting up and hardening a dedicated headless bitcoind and lightning daemon and wanted to have a discussion about location of the bitcoin.conf. Item #1: Bitcoind defaults to using ~/.bitcoin/...
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1answer
327 views

Bitcoin Core lost coins

i have lost a bit of coins using Bitcoin Core wallet. I have send my coins from Bitcoin Core wallet to my address on Bitstamp(copy/paste,no mistake here) and on my Bitcoin Core wallet has said "sent" ...
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2answers
290 views

Sending BTC using Seed Hex or mnemonic

I’m interested in sending BTC from wallet to another and probably automate it through some libraries. I have a question: if I have a seed hex or 12 words I can generate all my wallets (addresses, ...
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1answer
377 views

Can*t call chainActive.Tip()->nHeight in core.cpp

I want to call chainActive.Tip()->nHeight in core.cpp. It is not possible, I am interested in every idea. https://github.com/LIMXTEC/BitSend/blob/DEV-joshafest/src/core.cpp Here is an example : ...
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1answer
16 views

Bitcoind is not synching, why?

My log was stuck on this for 30 minutes: 2019-12-09T22:33:17Z txindex is enabled at height 0 2019-12-09T22:33:17Z txindex thread exit 2019-12-09T22:33:17Z Bound to [::]:8333 2019-12-09T22:33:17Z ...
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2answers
77 views

What happens when a node cannot find the base Block of a newly received Block

This particular question has been bugging my mind for sometime now. Suppose there an adversary miner who mines a Block with one of his transactions. The miner would only send the updated Block to a ...
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1answer
55 views

Is there a way to allow use of unconfirmed RBF outputs in transaction building?

Bitcoin Core seems to not consider unconfirmed outputs that are marked replaceable in input selection. Is there a way to override this protection and allow use anyway? The transaction is created using ...
2
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1answer
121 views

Wallet for btc bot

Which bitcoin wallet should I use to manipulate it programmatically? I don't want to use heavy bitcoin-core. But as I understand there are different kinds of bitcoin's thin clients: some outsource ...
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1answer
31 views

How can I get whole info about tranasaction whose outputs are spent?

I use RPC method getrawtransaction to get whole info about transaction. But if I rigth understood It works only for transaction whose contains at least one unspent output. How can I get whole info ...
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2answers
158 views

Bitcoin Transaction using API with Custom Fees

I want to transfer Bitcoin from one individual address to another using API. But I want to set Transaction fees as per my requirement. So How can I do it ? Right now I am using blockchain-transaction ...
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1answer
30 views

Retrieve last x transactions from multiple wallet

I create an app which allow each user to own 20 wallets that support 20 coins (btc, eth, monero, neo etc), as well as support but BTC with USD. IF i want to retrieve last 10 transactions of user (of ...
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17 views

Factors affecting Bitcoin pricing [closed]

I have two non technical queries pls. Maybe the scientists here can answer them. What factors influence the price of crypto currency? Is there any benchmark index for the crypto currency? I am ...
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2answers
33 views

Why same output address is invalid in a transaction on Bitcoin Core?

I'm studying Bitcoin Core currently. I found incomprehensible code, that shows making a transaction is rejected if there are same output addresses in a transaction. See Fig1, Fig2 Origin source code ...
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2answers
66 views

How to move only “blocks” and “chainstate” folders on an external USB hard-drive while running Bitcoin Client on connected laptop with Ubuntu?

I have experience with secure-copy and secure-download but how do I move only the Bitcoin Client "blocks" and "chainstate" folders within the home directory of Ubuntu 18.04 to an external USB hard-...
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1answer
252 views

How to send Ethereum from a “paper wallet address” to another address using an API?

I have an "Ethereum Paper Wallet Address" and this address has $5 USD amount of Ethereum. I want to transfer that ether to another Ethereum address using an API. Please let me know if any more ...
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15 views

BCH to BTC by accident [duplicate]

I sent BCH to a place that only accepts BTC by accident. If they don’t take it why didn’t it come back to my account. It’s not in my account. Uh they say they don’t have it and I have a transaction ...
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1answer
33 views

Why can't a user import keys to the keypool for a blank wallet?

I am creating a blank wallet with the intention of adding keys to the keypool but get an error keys can only be imported to the keypool when private keys are disabled Why? It would be beneficial for ...
2
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1answer
48 views

Is the ordering of blocks in the rev*.dat files same as the blk*.dat files?

I understand that blk*.dat files save the blocks in the order it gets them from it's peers. Is the rev*.dat files in the same order as the blk*.dat files? For example, would the 400th magicbyte in ...
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1answer
64 views

Transaction net gain/loss

I have a TXid in my wallet that contains multiple transactions (multiple sends and receives). From what I read these are transactions the network creates facilitate splitting/combining multiple inputs/...
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1answer
256 views

Bitcoind could not locate RPC credentials but rpcuser and password are set

I installed bitoind and synced it. But when i'm trying to connect from my php website i getting: Unable to connect to http://user:password@my.bitoind.server.ip:18332/. Also when i'm trying to see ...
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1answer
17 views

Wallet.dat in the mobile hard disk is not backed up after sending Bitcoin

Wallet.dat in the mobile hard disk is not backed up after sending Bitcoin, what can i do if the data recovery cannot found it? I have the original wallet.dat and private key, but there are no coins in ...
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1answer
69 views

Converting raw scriptPubKey to readable format

I am debugging Bitcoin cpp code. I wanted to see what exactly come for scriptPubKey property of output. Theoretically, I know this but I want to see in the code how does it looks like. Now while ...
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1answer
33 views

How to find address that holds the balance in Bitcoin Core?

I am unable to find the address that holds my balance in Bitcoin Core. All receiving addresses has a balance of 0. But there is a balance in the wallet. How do I find the address that holds that ...
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1answer
991 views

Blockchain Receive Callback API in callback url not working

I want to accept payments with the Blockchain Receive Payments API Using create different user different address on get bitcoin but not work Callback api https://blockchain.info/api/api_receive &...
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1answer
296 views

block decode failed (-22) error solo mining while submitting block

Hi I have developed hardware/software to mine bitcoin it's working and getting me the results (getting nonce since the design takes only .2sec to complete the task)i am trying to submit in my local ...
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1answer
129 views

ScriptSig raw hex to sign raw tx

i have a p2sh address that is created using an uncompressed public key (from my ledger nano) and a compressed public key (bitcoincore wallet). It requires both signatures to send the funds. When i use ...
3
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1answer
248 views

Bitcoin Core 0.13 How many addresses it can **effectively** manage?

I want to know, what's the maximum amount of addresses that Bitcoin Core 0.13 can manage? All addresses should belong to the default account. I want to use walletnotify feature How startup time ...
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0answers
13 views

Intermittent error “min relay fee not met” even with decent fee and custom Electrumx+Bitcoind

I have an automated system that sends BTC payments via Electrum for a client. Now, it happens again and again that payments keep failing with "min relay fee not met" (RPC call failed: {"code":-32603,"...
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1answer
1k views

How to send bitcoins without the bitcoin client in PHP

Is there a way to send bitcoins programmatically without the bitcoin client using PHP?