Questions tagged [development]

This tag should be used for questions related to creation and ongoing work for different existing and future Bitcoin-related projects and source code.

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32 views

What testnet environment and configuration for Bitcoin?

Every tutorial I have gone through to download bitcoind, I haven't been able to complete because my computer can't handle the full node download. These are my specs: 2017 Processor - 2.3 GHz Intel ...
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1answer
35 views

I started build my own blockchain based on mastering bitcoin book using git on win7 and i have a problem

I started learning how to build a blockchain from Antonopoulos book using Git Bash and i have a problem. I used commands: git clone github.com/bitcoin/bitcoin.git cd bitcoin git tag git checkout v0....
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1answer
25 views

Strange re-connection problem with python-bitcoinrpc

I am using https://github.com/jgarzik/python-bitcoinrpc to access the bitcoin core rpc. I have found a very strange re-connection problem. from bitcoinrpc.authproxy import AuthServiceProxy, ...
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0answers
21 views

Where can I find a detailed network protocol spec? [duplicate]

I have been trying for a while to understand how the bitcoin network works, which I (kind of) do on a high level. However, all of the sources I read don't go into the details of the protocol that ...
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0answers
11 views

Adding own h files to Makefile.am

I need some help with own adding files(.h ) to code base to resolve undefined reference problem . CXXLD bgoldd /usr/bin/ld: libbitcoin_consensus.a(libbitcoin_consensus_a-interpreter.o): in ...
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1answer
38 views

Is Block Finalization a valid development to remove the threat of 51% attacks?

https://www.reddit.com/r/btc/comments/bq8cqo/btctop_currently_has_51_hashing_power/eo2p4md?utm_source=share&utm_medium=web2x A recent comment from a Reddit user in response to BTC.top acquiring ...
4
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1answer
105 views

What are the major technical differences between Bitcoin and Bitcoin Cash?

For a research project I'm trying to detect the major technical differences between Bitcoin and Bitcoin Cash. I know that BCH uses a larger block size and does not support SegWit. But what other ...
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2answers
77 views

Script Bitcoin represent number > 16

I'm studying Script language, but I don't understand How can I rappresent the number > 16, for instance 210 I want to do a simple sum OP_10 210 OP_ADD how I have to represent 210? I'm trying with ...
4
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1answer
128 views

How would the gossip protocol announce channels from a channel factory?

I was just listening to SLP59 with Christian Decker. They mainly discussed channel factories. While the construction of multiparty channels and higher order systems (sub channels) being derived from ...
4
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1answer
116 views

What languages can I write plugins for c-lightning in?

I know that there's a Python library available for writing plugins for c-lightning. What would I need to do to for example use a JVM language like Scala?
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0answers
49 views

Question about modify Vanitygen

I follow the instruction on this post to create bitcoin address from given hex private key In vanitygen.c Replace EC_KEY_generate_key(pkey); with BIGNUM *res; BN_init(&start); ...
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1answer
51 views

How do I catch the unconfirmed transactions?

I'm catching all the deposit transactions with walletnotify and insert them into my database. Then on every blocknotify call I fetch all the transactions under 6 confirmations from the db and update ...
4
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1answer
361 views

How to find all UTXOs?

It is known, that UTXOs stored in chainstate database. But how to get them in simple txt view? Not ballances, but each UTXO.
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2answers
114 views

What is the source of initial transactions of bitcoin?

Sorry, if I am wrong or silly! It is understood that: a) Satoshi Nakamoto sent the first transaction to developer Hal Finney on January 12, 2009, the genesis block contains 1,073 transactions and he ...
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1answer
197 views

Modify vanitygen to generate from massive amount of given private key

I just using vanitygen recently & figure how to create address from a given hex private key, this is my code while (!vcp->vc_halt) { if (++npoints >= rekey_at) { ...
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1answer
49 views

Why Ardor does not use Maven?

Are there some reasons why maven and standard maven directory layout are not used in Ardor?
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1answer
83 views

How does bitcoin broadcast information?

On Bitcoin's Blockchain, how is information transmitted instantly to all other nodes and do nodes 'talk to each other' through an API? Do Blockchain nodes communicate with each other through HTTP ...
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2answers
36 views

Would bitcoin core work on a big endian system? Or even a system where C++'s `int` is not 32-bit?

Looking at the source code of bitcoin core, the serialization part, I see that there's no serialization abstraction layer that accounts for a possible different endianness or different binary layouts ...
2
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1answer
70 views

Create a new receiving address in the behalf of another wallet?

I want to create an API service that will trigger my local wallet to generate new account with receive address and return that address to a user. User => API => my_local_wallet => API => User The ...
1
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1answer
34 views

I am web developer, can i use my working pc to mine and work at same time? [duplicate]

Guyz, i am a web developer, i have single pc but i am thinking to add a good GPU in it, my question is that if i add good GPU, will i be able to mine crypto currencies like BTC/ETH and work on my pc ...
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0answers
35 views

What Off-Chain programming languages are important in Blockchain development

I am looking at getting into Blockchain development, and I would like to have some idea about general programming languages that are relatively important compared to the general developer-market. ...
1
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1answer
78 views

Blockchain gets stucked if no blocks are mined

Yesterday I decided to fork a project, just for fun and to learn more about it. So, I forked a project, I generated my own genesis block, changed timestamps, nounce, keys, reset the min chain work. ...
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1answer
32 views

Are sockets kept open when connections are made?

The bitcoin protocol says that any given node is connected to at least 8 other nodes. Does that mean that when a client connects to a node and learns about new peers... will the client keep the socket ...
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2answers
47 views

Mining Bitcoins on PC - Experiment, looking for advice or simple instructions [closed]

I am absolutely new to Bitcoin and mining, I know that mining at home using a PC is not worth even the time and takes years to get any income out of it. The thing is I need to mine at home using a PC ...
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0answers
54 views

Exchange development good practices

Is there any guide or good practice rules to follow when developing a service that uses the Bitcoin and other cryptocurrencies protocols? For instance, how is the best way to know if a user deposited ...
2
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0answers
71 views

Why is the Serialization limit set to 0x02000000?

In addition to the block size limit, there is a limit on the maximum message size. Is there a rationale behind the 32MB limit set in src/serialize.h or was it picked because it's just a nice round ...
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1answer
43 views

History of ideas behind a bitcoin protocol [closed]

Could you outline the logical sequence of main ideas (concepts) that contributed to the evolution of the bitcoin protocol from the beginning to now?
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1answer
159 views

Debugging Bitcoin Unit Tests

I am running the unit tests from bitcoin source using make check, and would like to debug the tests using LogPrint in the bitcoin source files. I read in the Test Docs that logs are only output to ...
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1answer
219 views

How to setup a Bitcoin private net that can simulate the public net?

I have some experience in Ethereum-related development and it was very easy to set up a private net with Ethereum that simulate the public main net, I just create a custom genesis block json config, ...
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1answer
349 views

HD Wallet Child Private Key Derivation Function

I was trying to understand the specs on CKD function from both the bip32 standard and Mastering Bitcoin book, I couldn't understand how a private key is derived from the left side of the extended key. ...
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1answer
39 views

bitcoin repo sighash.json data format

Bitcoin enthusiast here. Learning "the hard way" how bitcoin works (andreas books, looking in js/python implementations), I'm writing (as an hobby) some code here and there to understand things and to ...
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1answer
28 views

Custom bitcoin confirmation process

I am implementing a payment module for bitcoins. I have the following case. I need customers to be able to pay in bitcoins. But for some reasons I cannot use existing solutions like Bitpay. ...
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2answers
160 views

Is the UTXO set size important for non-mining full nodes?

Recently, I have seen a lot of development effort going into techniques for different ways of storing, pruning UTXO/TXOs. The main motivation cited is reducing block orphaning, which is mining-...
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2answers
1k views

Bitcoin Script tutorial

Are there any tutorials with examples on Bitcoin Script: from basics to complex scripts?
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0answers
362 views

How much disk space does it take to run a blockchain explorer?

I understand that you can use existing explorers like blockchain.info for quick access to individual transactions and address balances, however I would like to run an explorer of my own Like ...
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1answer
262 views

How to disable mining functionality in wallet debug console?

I am creating a new altcoin and i cant seem to figure out how to disable mining functionality with wallets using the debug console window. I am trying to mine all the coins myself, is there way to ...
0
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1answer
294 views

Electrum Gap Limit from CLI

Is there any way to change wallet gap limit in Electrum from command line? If yes, how? If not, could it be bypassed using some kind of external script? I really need to avoid GUI. Thank you in ...
0
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1answer
165 views

Bitcoin cash with bicore and addressindex

Bitcore runs a version of bitcoind where theres address index and we can search any addresses I have implemented the bitcoin insight block explorer and its working perfectly I need to implement ...
0
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1answer
21 views

How can a cryptocurrency demotivate investment in favour of continued transactions?

Is it economically and practically possible to create a system where investment cannot take place?(or if it does, it doesn't affect the system in a big way like Bitcoin had extremely high prices due ...
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1answer
22 views

Are there any tools to check values in tx validation?

Are there any developing tools that can show values(like the hash of tx to sign or the stack of script execution) in tx validation so that developers can check the correctness of their validation code?...
0
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1answer
573 views

Where is the actual data stored and how does that data get stored [duplicate]

How does data get stored for bitcoin? Does data in the blocks get stored in files or a database and then get referenced by the blockchain? If data is being stored in file, how does the blockchain ...
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0answers
95 views

Wordpress exchange platform [closed]

Hello from where I should start to built my own cryptocurrency exchange and Fiat/crypto exchange on wordpress? What steps I should take to built that kind of platform? I have some knowledge of ...
0
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1answer
603 views

Running a bitcoind docker

Thanks to the bitcoin.stack community I have successfully launched a bitcoind docker with an external volume which has the block data Currently its in 100% sync but I am facing an issue to get ...
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1answer
84 views

How do coins upgrade there blockchain from 10v or 11v to 12v

Hi am a 15 year old who wants to do this for a living so i don't read much so i learn better by doing it. So i wanted to upgrade a wallet to a newer version. So i did it all after my 1000th attempt it ...
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1answer
166 views

How is Ethash a 'memory hard' algorithm if it utilizes peak GPU memory bandwidth?

According to the Ethash algorithm described here, the computation for each nonce requires a loop of 64 iterations, where each iteration reads a chunk of 128 bytes from a pseudo-random location in ...
2
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0answers
249 views

Multicoin wallets with programmable API

Does there really not exist a web multicoin wallet that has a programmable API that can be used by apps to send transactions? It is common practice to authorize your credit card in an app so that it ...
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2answers
216 views

Unclear on double-hashing previous Transaction when creating a new Transaction

I'm having trouble performing the double-sha256 hash of the previous transaction, Step 3 in this explanation. The previous transaction is: ...
0
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1answer
240 views

How an order fulfillment works

I'm trying to understand how order fulfillment algorithm works from technical point of view. Let's say I created an order to sell 0.8 BTC and buy 5400 XRP along with other orders to sell 0.35 BTC, 2....
1
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1answer
271 views

In Bitcoin source, what is the UniValue objects purpose?

In the bitcoin source code you can see a lot of objects of type UniValue, particularly in the miner.cpp and rpc/mining.cpp. What is the utility of this UniValue object? Is it used to update the ...