All Questions
29,237
questions
3
votes
1
answer
20
views
Does bitcoin core scantxoutset include mempool transactions?
In my local experiments so far, I don't think that scantxoutset includes mempool information. What options do I have if I want to scan the current utxo set(with mempool updates) for a particular ...
- 4,359
0
votes
1
answer
40
views
how do miners guess the next block version?
ok guys, so don't laugh at me because im new into this:D
I know that each block has a different "block version" right?
but, how to guess the block version from the next block?
lets say ...
- 20k
2
votes
2
answers
568
views
Transaction history with bitcoinj
I am new to bitcoinj. I want to print out the list of transactions like as follow for a wallet:
1- Sent 1 BTC to Adress1 on 'A' Time
2- Received 5 BTC from Adress2 on 'B' time
3- Sent 2 BTC to ...
CommunityBot
- 1
1
vote
0
answers
7
views
bitcoin-core building disabled binaries
good day,
I have just tried upgrading to core 24. As I am looking for a purely headless bitcoin-core, my process was the following
rm -rf bitcoin
git clone https://github.com/bitcoin/bitcoin.git
cd ...
- 11
1
vote
2
answers
459
views
Is verification of a blockchain computationally cheaper than recreating it?
One of the advantages of cryptocurrencies like Bitcoin that is often repeated is how hard it should be to manipulate past transactions. The reason that is often stated is that you would have to re-...
- 20k
1
vote
1
answer
193
views
Monitor a bunch of addresses for deposits
I have a situation where I create one address per user through GetNewAddress(User.Id)
So, in the end, I have a lot of addresses to monitor, to see if any user has deposited money.
I can do something ...
CommunityBot
- 1
2
votes
1
answer
14
views
Muun Wallet - All Funds Stored On-Chain?
I've read so far all official Muun articles about the submarine swaps and emergency kits, but one thing still has me confused.
Let's say I receive $500 worth of Bitcoin on-chain to my Muun wallet. ...
- 3,416
1
vote
2
answers
961
views
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 ...
CommunityBot
- 1
0
votes
1
answer
52
views
Can a full node measure bandwidth to and from its peers?
For example, can I run a full node, connect to some 8 peers, and measure my uplink and downlink bandwidth to each of my peers?
CommunityBot
- 1
0
votes
1
answer
689
views
Litecoin - mandatory-script-verify-flag-failed (Signature must be zero for failed CHECK(MULTI)SIG operation)
I have manually a raw transaction using bit library in order to send a transaction using Litecoin testnet. After adjusting fee's and other network variables I got the following error that is stated in ...
CommunityBot
- 1
2
votes
1
answer
372
views
Is the checksum used in BIP39 mnemonic sentences too short?
In the BIP39 specification, you add 1 bit of checksum for every 32 bits of entropy you generate.
Therefore, with a common entropy size of 128 bits, you are only adding 4 bits of checksum. This means ...
CommunityBot
- 1
0
votes
2
answers
71
views
In what data structure bitcoin transactions are stored in blockchain
In what data structure bitcoin transactions are stored in blockchain? That Vout and Vin thing in blockexplorer it is in json format.So in code what data structure is used since in the bitcoin node ...
- 1,450
2
votes
2
answers
39
views
Can you know the final destination of a BOLT12 offer?
It is said that a BOLT12 offer does hide the final destination, and therefore protects privacy of receiver.
However, I just generated an offer, decoded it, and in the value node_id, it had my node's ...
- 141
2
votes
1
answer
557
views
What is a "serialized signed transaction"?
Shown in the gray area here, describing how to apply, I think, Segwit to a transaction (particularly a Bitcoin Cash tx). The last section is titled "serialized signed transaction" however ...
CommunityBot
- 1
0
votes
1
answer
17
views
Identifying Closing Balances on Lightning
Is it possible given on-chain and gossip protocol data to derive closing channel balances? For example, the following channel between ACINQ and magnetron has two txouts but unsure who's balance is ...
- 65.9k
3
votes
2
answers
571
views
How does a miner put his vote for certain BIP?
I understand that a miner is the only one who can vote for a certain BIP, but I'm wondering, how do they technically do that? How do they submit their vote? I found out that they are doing it through ...
- 474
0
votes
0
answers
10
views
Startin on IOS 13 Mac book
Installed the wallet on an external drive. He worked. After I updated to ios 13 after that the wallet stopped running. I tried to reinstall. But he couldn't do it. When loading blocks, it gives an ...
- 65.9k
0
votes
1
answer
34
views
Bitcoin Core through Tor (Windows), cookie permissions
I'm running a pruned node Bitcoin Core 23.0 gui (on Windows 10). My mission is to run the node through tor (0.4.7.11) for privacy. I'm mostly following this guide ( https://en.bitcoin.it/wiki/...
- 589
2
votes
1
answer
216
views
How to import multi sig using importmulti correctly?
I create a 2 of 2 with createmultisig using 02254aba14091e45a9067fbe5b225b3863d1c49650226d583dcede06a7c33f8613 and 02ad64a03b7fc53c02f68eac04743b819bfeeabe6ca7007f473dbaf7c3570f5dc9 pubkeys.
I then
...
- 11.6k
0
votes
1
answer
142
views
How to create an application which constructs a transaction using `bcoin` (javascript)?
I am new to development. I am working on a project and I am trying to use bcoin.
I want to create an application which has a UI, where the user will be asked to enter Destination address and amount. ...
CommunityBot
- 1
0
votes
0
answers
24
views
How many transactions are required on trust before I can withdraw money?
I am using Trust to purchase bitcoin. I wanted to withdraw funds. I was told I needed another five transactions before I could withdraw funds? Is this a policy that so many transactions are ...
- 1
0
votes
1
answer
41
views
Unable to start BitcoinCore: Unable to start HTTP server. See debug logs for details
After long time of not running Bitcoin Core I ran it and got:
Config file was:
# server=1 tells Bitcoin-QT to accept JSON-RPC commands.
server=1
# You must set rpcuser and rpcpassword to secure ...
CommunityBot
- 1
1
vote
1
answer
23
views
Error installing on Mac - Build does not support Berkeley DB database format
Im following the guide here (https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md) to install Bitcoin on my Mac. I want to be able to run bitcoind with and without the GUI.
The first time I ...
- 11.6k
1
vote
1
answer
9
views
CLN listnodes command occasionally returns too many features flags
The BOLT #9 specification shows a 52-bit field that represents various feature flags. That should require no more than 7 bytes, or less.
When I run the listnodes command, some of the nodes include ...
- 8,949
6
votes
3
answers
2k
views
Why is connecting bitcoin exclusively over Tor considered bad practice?
I've heard that a bitcoin node with only Tor connections is "trivial" to eclipse attack and that such nodes should maintain at least one (or more?) clearnet connections in addition. What is ...
0
votes
1
answer
1k
views
GREP help: Bitcoin address/key buried as text somewhere on hdd
So in a drunken moment of genius I had forgotten about, I bought some bitcoin way back. And I buried the address and key in some file... I was being tricky lol. That likely also led me to abandon a ...
CommunityBot
- 1
1
vote
2
answers
126
views
Bitcoinja-lib. bitcoin.payments is null
I installed bitcoinjs-lib with command: meteor npm install bitcoinjs-lib.
The installation command "flow-typed install -f 0.27 bitcoinjs-lib@2.2.0" didn't work. No idea what flow-typed is and the ...
CommunityBot
- 1
2
votes
2
answers
817
views
How can I get the date of the last transaction from the blockchain.info API?
Is there a way to request the date of last transaction via API? I run a request to see balance of my addresses and need to request the date of the last transaction, how would I do that?
CommunityBot
- 1
0
votes
1
answer
277
views
Is there a CUDA binary to convert a brainwallet string to a BTC address?
I am looking for a CUDA program which will take a single argument, a brainwallet password, and output a BTC address. After reading through several threads on how to convert passwords to public keys, ...
CommunityBot
- 1
-2
votes
0
answers
22
views
How to understand and calculator Z (hash of the message being signed) value in Segwit rawtx
How to understand and calculator Z (hash of the message being signed) value in Segwit rawtx.
I don't know this value really exist in Segwit or not? if exist how to calculator that for rawtx and what ...
- 17
1
vote
1
answer
2k
views
How to retrieve Trezor wallet with recovery seed?
I've been at this for days now without finding the links to click on. I have a Trezor wallet that I bought years ago. It has some bitcoins on it. I have the recovery seed, but I lost the pin. From ...
CommunityBot
- 1
0
votes
2
answers
383
views
Raw data of dates in all blocks using PHP or R
Is it possible to obtain the date (time stamp) of each bitcoin block so far, using languages like PHP or R?.
I am developing an analysis of the time series of bitcoin use for a scientific project, ...
CommunityBot
- 1
0
votes
0
answers
12
views
Private key problem, getting an error (code -4) please help [duplicate]
im trying to get my private key, i did wallet passphrase 600, got null response, did dumpprivkey "wallet" and i get

This type of wallet does not support this command (code -4)
anyone know ...
0
votes
1
answer
16
views
4
votes
1
answer
1k
views
Generate addresses from Trezor's xPub using Python
I am trying to generate BIP32 HD addresses from my Trezors xPub key.
I keep getting errors with most of the libs our there. What am I missing?
pywallet:
from pywallet import wallet
xpub = '...
CommunityBot
- 1
0
votes
1
answer
568
views
How to generate Electrum address with pybitcointools
I want to create a payment service where I want to be able to charge each client according to its invoice. I picked Electrum as my underlying wallet and pybitcontools as my Python interface.
I would ...
CommunityBot
- 1
1
vote
1
answer
777
views
bitcoin.conf file on mac
I have installed bitcoin core on mac and accessed the config file from the preferences tab on the bitcoin-qt.
Now, I have started testnet on it by the below settings.
testnet=1
server=1
rpcuser=...
CommunityBot
- 1
1
vote
1
answer
194
views
How can I recover my private key?
I have a part of an UNCOMPRESSED private key. Starts at 5, missing 10 characters at the end. I saw the code on this forum and used it in python. But when working with my key, it gives out 2 incorrect ...
CommunityBot
- 1
0
votes
2
answers
140
views
How Bitcoin avoids double spending?
If someone is sending bitcoin with low transaction fees and then sends the same bitcoin with higher transaction fees before the previous one is confirmed, so it is obvious that miners will pick the ...
CommunityBot
- 1
2
votes
1
answer
2k
views
Problems with Antminer U1 - why doesn't it work?
I've got other Antminers working, this one just throws these errors in debug mode - is this fixable?
[2014-01-30 19:03:10] Bmsc send golden nonce
[2014-01-30 19:03:10] ANT0: GetResults (amt=0 err=-...
CommunityBot
- 1
0
votes
1
answer
21
views
Additional instructions in TX
Would it be possibile to add additional information in TX?
I would like to add time of transaction in it.
Would hash of TX change if hostile node would change that time ?
CommunityBot
- 1
2
votes
1
answer
173
views
I can't send a transaction from electrums cli
I am trying to send a transaction in the cli using electrum with the command ~$
electrum --testnet payto mvYrQck9VfujSanmwvQxiLab3fLuywGdvh 0.01 -f 0.002
Password: (I entered the correct password ...
CommunityBot
- 1
0
votes
1
answer
154
views
how to get masterkey and consequent wallet keys from root seed?
So basically i am trying to create my own crypto wallet application in python, i have generated the random entropy, calculated the checksum, generated the 12 words and then generated the root seed ...
CommunityBot
- 1
0
votes
1
answer
339
views
Blockchain.info Payment API -> Callback gets a 302?
I want to integrate the Blockchain.info Payment API and everything works fine so far. The callback works and triggers the code on my server, if a payment comes in. But if I check the callback log of ...
CommunityBot
- 1
2
votes
1
answer
1k
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 ...
CommunityBot
- 1
0
votes
1
answer
54
views
import private key into bitcoincore - getting error
I am a total dummy/layperson and cannot figure out how to import my private key into bitcoincore v23. I keep getting the error "this type of wallet does not support this command" when typing ...
CommunityBot
- 1
0
votes
0
answers
30
views
How can I become 100% owner of a bitcoin node?
How can I become 100% owner of a bitcoin node without depending on bitcoin core, umbrel, etc. For a cryptocurrency project I need a bitcoin node that I own to be able to receive and send funds from ...
0
votes
0
answers
8
views
how install a local btc node for test
i use ganache to test and execute a smart contract and test with my backend for Ethereum,
but I want to know if there is something similar in BTC and DASH.
even if I install BTC-core, a node core for ...
2
votes
1
answer
33
views
Can I create a P2PK tx?
Is it still possible to send to a pub key directly?
How would I construct such a tx in raw hex, and would the mempool accept it?
Thanks
- 151
7
votes
1
answer
18k
views
