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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8
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1answer
9k views

Extract private keys from Bitcoin Wallet

I have encrypted my bitcoin wallet. I know the passphrase, that's not the issue. I want to transfer my bitcoins to blockchain.info but it's asking me for the private key. I cannot find it nor can I ...
8
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2answers
14k views

Does the program I downloaded (bitcoin-qt) mine bitcoins? [duplicate]

Possible Duplicate: How can I start mining Bitcoin? Nothing ever says how to actually mine bitcoins, except to join a pool. I don't want to do that. All I really know is that each block has an ...
7
votes
1answer
454 views

What's the distinction between BIP 157 and BIP 158? Are they supported by Bitcoin Core?

BIP 157 and BIP 158 are both concerned with Compact Block filters. What is the distinction between them, and which of them does Bitcoin Core currently support?
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1answer
2k views

Port forwarding plus Bitcoin

Bitcoin has only 8 active connections, and I read somewhere that it helps to forward ports. I know how to forward a port, but which port should I forward, and how should I tell Bitcoin-qt to use the ...
7
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2answers
1k views

Transaction confirmed by network but never showed up in bitcoin-qt

I've sent a large amount of coins to 1K7SzBTPGyyEtWsudwHpjg31LjrPf17qr4 but my bitcoin-qt client (V. 4.7.4) doesn't show any balance. 1) Under the "Receive coins" tab it shows the same address 2) The ...
6
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2answers
6k views

16: mandatory-script-verify-flag-failed (Non-canonical DER signature) (code -26)

I try to send transaction via sendrawtransaction in console of bitcoind. Sig is: ...
6
votes
1answer
3k views

Why is my client saying “A fatal error occured. Bitcoin can no longer continue safely and will quit. ”?

i am running bitcoin client on OSX. I am by no stretch of the imagination any good at using terminal. I had over 300 btc in there and my computer went black and now client keeps giving me this message ...
6
votes
1answer
260 views

Add dependency Bitcoin Core

I'm trying to add a new dependency to my Bitcoin Core fork. The dependency is Rapidcheck, a property based testing framework. I've added a file called rapidcheck.mk inside of depends/packages with ...
5
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1answer
2k views

What to do about a “stuck” transaction?

I started the standard client with --rescan instead of -rescan after switching wallets and before synchronizing with the latest blockchain, and made an going transaction. This transaction got "stuck",...
5
votes
1answer
202 views

What is better, pre-existing Bitcoin-core API bindings for python or custom wrapper functions

How advisable is using the following code to query the bitcoin core as compared to using some python RPC library. import os btc_prefix = 'bitcoin-cli ' def getblockcount(btc_prefix): print("in ...
5
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1answer
407 views

Does full node store all valid forks and “alternative” blocks from blockchain history?

Forks are possible when mining the blockchain and happen "all the time" during mining. This means the nodes monitoring the blockchain have recorded many forks during blockchain's lifetime, with some ...
5
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1answer
3k views

Running full node over Tor

I am attempting to run a full bitcoin-core (v0.13.1) node over the Tor network for the first time. I have set up my /etc/tor/torrc file with the following two lines: HiddenServiceDir /var/lib/tor/...
4
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1answer
1k views

mysql instead of leveldb for bitcoin core

Is it possible to use db other than leveldb for bitcoin core? I'd like to make queries on running node and make views with decoded data
4
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2answers
594 views

Multisig doesn't work unless all keys were generated from the current wallet?

I tried to create a multisig in both the Bitcoin network and the Bitcoin testnet. It seems to work only when all public keys are from the current wallet. That means when I call listunspent after I ...
4
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2answers
337 views

How does the network apply credit for created blocks?

First post. I must say in advance thanks to everyone for all the great conversation and help and software so far. It's really helped me get familiar with bitcoins and bitcoin mining. I have a ...
4
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2answers
835 views

How much time it takes to verify a Bitcoin signature in the Satoshi client?

Assuming: An average modern computer Using a single thread, as the current Satoshi client does Using the OpenSSL library, as the Satoshi Bitcoin client does The signature is not in the signature ...
4
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2answers
234 views

Does a 2009 node sync the whole bitcoin blockchain

So does a 2009 node sync the whole bitcoin blockchain and does the temporary split of 2013 have any impact on that?
4
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3answers
507 views

Running two bitcoind instances for different nets

Is it possible to run two separate bitcoind instances on one system at the same time, one for mainnet, other for testnet?
4
votes
1answer
80 views

What are the downsides of integrating accumulators like utreexo to bitcoind?

Inspired by the discussion in this question I wonder what would be the downsides of adding accumulators like utreexo (paper at: https://eprint.iacr.org/2019/611.pdf) to bitcoind? On the positive ...
4
votes
2answers
2k views

Is there a way to access my BItcoins before Bitcoin qt syncs?

I used QT to generate an address, and have received some coins, but they're not showing up because it hasn't synced yet. It looks like syncing will take 2 days. Can I access the coins before then? ...
4
votes
1answer
535 views

How do I calculate the witness commitment hash for a given block?

From my understanding, every SegWit enabled block has an added output script which is used as a place to store the "Witness commitment" specified in BIP 141. One issue I've stumbled upon was ...
4
votes
1answer
3k views

Wallet.dat (<0.4.0) format: retrieving Bitcoin, possible security concerns

Whilst moving houses I came across some old HDDs which I've just found contains a wallet.dat from August 2011. The version of Bitcoin-qt must be 0.4.0 as I know the wallet.dat is password encrypted, ...
4
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2answers
3k views

Broadcast a signed transaction

I sent money from 4 inputs to 2 outputs, one of which I don't control. The transaction's fee is too small (didn't change my settings and the transaction fees got a lot higher, recently) and will not ...
3
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0answers
95 views

Bitcoind 0.5.3 stuck at block 364,670 - what to do?

I compiled bitcoind using the same steps as last year. In particular I set DB_CONFIG: set_lg_dir database set_lk_max_locks 537000 Unfortunately once I hit block 364,670 (2015-07-10) I'm treated with:...
3
votes
1answer
2k views

Sent bitcoin with no fee, waited and bitcoins disappeared

I sent about $425 to an adress from my bitcoin-qt wallet and forgot to include a fee. So I googled and googled and waited around for 4 or 5 days for it to stop broadcasting but I get on my computer ...
3
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1answer
2k views

paytxfee vs maxtxfee which one overrides the other

In wallet options section it shows these two settings -paytxfee=<amt> Fee (in BTC/kB) to add to transactions you send (default: 0.00) -maxtxfee=<amt> Maximum total fees to use in a ...
3
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3answers
952 views

Bitcoin communication with non-standard ports

I'm writing a Bitcoin web app that is to be deployed on an external server over which I have no control. I probably won't have access to standard Bitcoin port (8333). Will this cause a problem when ...
3
votes
1answer
174 views

What was the original rationale for limiting the maximum push size?

The current Bitcoin client filters out any pushes beyond a certain size. static const unsigned int MAX_SCRIPT_ELEMENT_SIZE = 520; // bytes [...] if (vchPushValue.size() > MAX_SCRIPT_ELEMENT_SIZE) ...
3
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2answers
2k views

Key pool in wallet softwares

From my understanding, bitcoind/bitcoin-qt uses a key pool for their wallet, so when you create a wallet you are actually creating not just one but many addresses for sending/receiving transactions. ...
3
votes
1answer
879 views

getrawtransaction in Bitcoin-Qt (0.8.5)

I am getting an error {"code"=>-5, "message"=>"No information available about transaction"} when issuing getrawtransaction. I am aware that since bitcoind/Bitcoin-qt 0.8, no transaction index is ...
3
votes
3answers
12k views

How do I load wallet.dat on new PC and import everything into Electrum? [duplicate]

My primary PC died last month due to what I believe is a motherboard error. My EVGA board displays "FF". The fans, drives, everything powers up as usual. But I don't hear any beep, no POST, no BIOS, ...
3
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2answers
2k views

Unable to bind any endpoint for RPC server

I recently updated my bitcoin docker image to bitcoing v0.18.0 version and can't allow external rpc connections to it now. It binds to localhost if I set rpcallowip=X.X.X.X, then I tried to used ...
3
votes
1answer
1k views

Found an old wallet with transaction history with coins (unconfirmed), but no balance [duplicate]

I have found an old bitcoin wallet in my files. I can see there are old transactions but they aren't confirmed. But there should be more BTC received than was sent, so there should be a balance. Is ...
3
votes
1answer
237 views

What do I have to do after Segwit activates if I'm running Bitcoin Core 0.14.1?

I have my bitcoins on a Linux Server. It runs Bitcoin Core 0.14.1. What do I have to do after Segwit activates?
3
votes
1answer
472 views

Bitcoin Core HD Wallet v0.13.2 missing confirmed incoming transaction

I made a transaction from my android wallet to my bitcoin core HD wallet (v0.13.2). At the time of writing, the transaction has 5 confirmations, both according to the android wallet and blockchain....
2
votes
2answers
161 views

When using bitcoin-cli I get an error regarding fallback fees when trying to send regtest Bitcoin. How do I resolve this?

I have been doing an assignment on Bitcoin Core 0.20. Now every time I try to do a transaction: Apples-iMac:bitcoin apple$ bitcoin-cli -regtest sendtoaddress ...
2
votes
1answer
255 views

Under what circumstances will a full node disconnect a peer?

I know a full node will disconnect from a node if that node "misbehaves". For example, a node's connection will be dropped if it sends too many messages that don't follow the rules (what rules?) and ...
2
votes
1answer
126 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 ...
2
votes
1answer
105 views

Step by step to make a SPV bitcoin node

As I know, there is a light node version called SPV. for now I have started a full node and it has downloaded 82222 blocks, but I don't want to have a full node with full blockchain, my purpose is to ...
2
votes
2answers
300 views

2 bitcoinqt - getrawmempool returns different results

I have 2 servers with running the same Bitcoin Core v0.9.3.0-g40d2041-beta (64-bit). I use getrawmempool to get all new transactions in the same time but I have different result. One server always ...
2
votes
2answers
456 views

Is it possible to run two Lightning Network nodes on top of single Bitcoin Core node?

I would like to simultaneously run LND and Eclair nodes on top of single Bitcoin Core bitcoind node. Is it possible? I wasn't been able to pull it off so far. If possible, how to set up ZMQ and ...
2
votes
2answers
399 views

How to import p2wsh-in-p2sh multisig as watch-only?

I've created a p2wsh-in-p2sh multisig address using an offline node. I have the address and redeem script, as provided by bitcoin-cli addmultisigaddress on the offline node. How do I import this as a ...
2
votes
0answers
80 views

Bitcoin-core restored HD wallet reusing payment address? [duplicate]

As I was testing my new bitcoin core HD wallet through the bitcoin-qt interface (v0.13.0), when using Receive > Request payment I realized that I was presented with the a payment address which had ...
2
votes
3answers
2k views

Convert between String/Hex/Byte in Java for sha256 - wrong format?

I am trying to convert a bitcoin address and have the following code from here (Calculate Segwit address from public address, 2nd answer): Step1: $ printf 1L88S26C5oyjL1gkXsBeYwHHjvGvCcidr9 > adr....
2
votes
1answer
991 views

Is it possible to have my blockchain on a different folder than that of my wallet files?

I am trying to implement bitcoin payments for the project I'm currently working on, and I need to create a bitcoin wallet that should be inside a USB stick. This USB stick should be at the hands of ...
2
votes
1answer
483 views

State of transaction and UTXO

What I have learned is that state is an abstract thing and is maintained by the node locally and the state of the current blockchain can be reached by starting all the way from the genesis block and ...
2
votes
1answer
123 views

Bitcoin Core What default values should I pass for some positional RPC params in sendtoaddress

I am trying to use the sendtoaddress rpc method of bitcoin core. From the documentation I read that I can pass "estimate_mode" parameter to estimate a fee. However as I believe json rpc follows ...
2
votes
1answer
2k views

Difference between createmultisig and addmultisigaddress?

What is the functional difference between createmultisig and addmultisigaddress in bitcoincore (v 0.10)? To be clear, I understand how both function. ie. multisigCmd n ["address1 public key as hex", ...
2
votes
2answers
11k views

Bitcoins not showing up in Bitcoin-Qt wallet [duplicate]

I bought 1 BTC from localbitcoins.com and received my bitcoin in my online wallet with no problems at all, after that I then sent it to my "bitcoin-qt wallet" address located inside the Bitcoin wallet ...
2
votes
2answers
399 views

How can I download the blockchain from own, trusted source?

I have two computers with two different bitcoin-qt wallets: Very heavy-weight desktop with a great internet connection. Less powerful laptop with relatively slow internet. I would like to download ...

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