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
150 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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2answers
261 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
43 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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0answers
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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0answers
28 views

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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1answer
19 views

`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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1answer
42 views

the client's 'invalidateblock' debugging command - possible prevention against majority attack?

there is a 'invalidateblock' debugging command in the btc client. How can this command be used in a situation of majority attack threat and play a part of countering the attack? I understand that ...
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1answer
32 views

Is it possible to forward signed transaction using bitcoind prune mode?

Summary: Is it possible to perform createrawtranscation , signrawtransaction and sendrawtransaction rpc call using bitcoin in prune mode? Detail : I want to implement an API that performs p2p BTC ...
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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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1answer
2k views

What is the point of downloading the blockchain?

I have Bitcoin-core on my mac, and currently it is syncing. But what exactly is the point of having the entire blockchain downloaded onto your computer? Is it only there so that you can have an ...
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0answers
23 views

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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0answers
10 views

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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1answer
179 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 ...
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2answers
63 views

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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2answers
1k 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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0answers
23 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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1answer
100 views

How to use Multisig feature on Bitcoin Core RPC in an online exchange?

I've craeted a small online exchange based on Bitcoin Core. The features in this application are: User send request to get a new address, and the Bitcoin Core generate a new one with defined ...
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1answer
44 views

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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0answers
16 views

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 ...
1
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1answer
36 views

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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1answer
52 views

Help - transfering bitcoin old bitcoin core 0.12.0 wallet

I have a old bitcoin core wallet 0.12.0 ... I tried to transfer bitcoin from this to a new Coinbase wallet 2 days ago... Nothing has shown up in Coinbase wallet and the status of the transation in ...
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2answers
113 views

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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2answers
850 views

How Do They Get BTC Wallet.dat With Balance?

Going through YouTube, I found some videos on Bitcoin wallet.dat with balance. Looking at these videos, you will notice that these balances found in these btc wallet.dat are not on watch only ...
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1answer
118 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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2answers
2k views
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1answer
1k 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
504 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
212 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 ...
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1answer
87 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/...
0
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1answer
111 views

Keeping wallet addresses outside bitcoin core

I'm trying to build a good security for my online bitcoin based application. Is something like this possible? send_bitcoin(address) create_address() sweep_balances() + | | ...
4
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1answer
383 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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1answer
24 views

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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0answers
49 views

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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1answer
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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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 ...
2
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1answer
130 views

Tor and i2p tradeoffs in Bitcoin Core

What are the different trade-offs involved in options mentioned below that users should consider while using Tor/i2p in Bitcoin Core based on privacy and security? Only Tor or i2p 1.1 onlynet=i2p 1.2 ...
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0answers
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 ...
0
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1answer
138 views

Forgotten password for wallet. Must a password be entered before spending?

I was about to spend some bitcoins but Bitcoin Core required my password, which I don't remember, to complete transaction... The wallet is open but cant use bitcoins. I would like to know if before ...
1
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1answer
311 views

HD Wallets, XPUB and child private key leaks

So some generalisations on xpubs and current wallet providers. Ledger and Trezor wallets can create xpubs which can show all transactions of a wallet When a passphrase is added, this counts as a new ...
2
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1answer
128 views

What is the purpose of submit header relative to submit block?

I understand what the usage is for submit block, but submit header exists in the RPC API reference. Is that a legacy function? Or can it still be used? Thanks
0
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1answer
37 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?
2
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2answers
113 views

What is a mechanism of providing Merkle Path?

In the Bitcoin, SPV node can query that its transaction is included specific block to full node that provides merkle path which has super fast calculation. In terms of full nodes, they have full-...
0
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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 ...
0
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1answer
79 views

Bitcoin core make error

I am new to bitcoin core development. I have created a clone using bitcoin core on a mac os mojave 10.14.3. I am have installed all dependencies and am able to run the autogen.sh and configure with ...
0
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0answers
12 views

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 ...
0
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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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0answers
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
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://...
0
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1answer
226 views

Bitcoin-qt -testnet 0.17.1 Send and Receive buttons do nothing

Fully synced on testnet blockchain after building Bitcoin with UI and wallet enabled on Ubuntu 18.10. Pressing Send and Receive buttons results in no UI displayed. Receiving addresses dialog doesn't ...

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