Questions tagged [javascript]

JavaScript is a high-level programming language widely used for web development.

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Bitcore-Lib generate OmniLayer Transactions

I am trying to create OmniLayer Transaction with Bitcore-Lib , but the OP_RETURN format using Bitcore-Lib Transaction.addData() like: const simple_send = [ "6f6d6e69", // omni 4bytes ...
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31 views

Cannot unserialize chainstate transaction outputs after de-obfuscation

I was able to read chainstate database. Getting the key and de-obfuscating to get a valid last block. However, when it comes to transactions that follow after that, I cannot de-serialize them no ...
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1answer
54 views

generating a zprv from a base58 rootKey with bitcoinjs-lib

var bitcoin = require('bitcoinjs-lib'); let bip32 = require('bip32'); let rootKey = 'xprv9s21ZrQH143K32CfqoCQHtbKiEb5BqFazXX6jCtNCnuty3gUjxS4CsXWi9rcNyHdjDVPiC6P1bnyEZr2ioouRq56h6HAdwejeTty1BsSEtL' ...
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1answer
30 views

Using Javascript, I want to generate a segwit private key (zprv) similarly to how I am generating my legacy base58 extended private key. How?

let bip32 = require('bip32'); let bip39 = require('bip39'); let { bech32, bech32m } = require('bech32') const seed = bip39.mnemonicToSeedSync('rural catch say tooth tell soul road pilot fee board ...
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1answer
50 views

How to spend from a custom P2SH script using bitcore-lib

My Javascript/typescript project uses bitcore-lib. It uses Script.buildScriptHashOut to build custom P2SH outputs. How do I spend from this custom output?
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32 views

Cryptocurrency Wallet 3rd party access

Do Crypto wallets such as Exodus etc have something like an API? For example is it possible to perform a cryptocurrency transaction directly from the web browser client (using the specified amount and ...
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1answer
24 views

Distinguishing bitcoin deposits

If i had a central Bitcoin wallet, and then allowed 3 different people to deposit bitcoin into that address, would there be anyway to distinguish who they are, without knowing who's address is who, i ...
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43 views

Bitcoin Script - Beautify

My question is if something exists to do the job in the opposite direction of miniscript. Miniscript's intention is to help:     ...writing (a subset of) Bitcoin Scripts in a structured way, enabling ...
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3answers
140 views

The best JavaScript libraries supporting Bitcoin Core?

I have downloaded and installed Bitcoin full node on my Linux server and I'd like to start working with the bitcoin core to create wallet, addresses, and transactions. What is the best JS libraries ...
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0answers
54 views

How can I use PSBT in a JavaScript project?

I am trying to use PSBT in a Bitcoin project. The idea is to generate keys and sign transactions client-side. I am already familiar with bitcoinjs-lib but I find the API rather complicated. It would ...
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0answers
32 views

Sign transaction externally

I create a transaction with inputs from a given address / public key without signatures. Every input needs to be signed. I use a different method to generate the signatures so I can't provide a ...
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0answers
127 views

bitcoind: How to get rawblock data with ZeroMQ

I am trying to use the zeromq api for bitcoind to get rawblock but its not working with the code I've provided below. I am able to get hashtx and rawtx if I remove the filter but not hashblock and ...
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2answers
152 views

Understand how transaction size and fees calculation works in caravan

Looks like there is no activity in caravan github repository so maybe someone here can help me with this issue. Already mentioned everything in the below link however my three basic questions are: ...
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0answers
99 views

How to connect to an ElectrumX server using JavaScript WebSockets?

I'm trying to connect to an ElectrumX server from an HTML webpage. But I can't get a working connection. I've tried with many servers from Electrum's servers.json list but none worked. Here's the ...
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0answers
25 views

Is there any 'Metamask-like' app for Bitcoin? [duplicate]

9 months ago someone asked this same question: Metamask-like web3 inject for bitcoin but I was wondering if there had been be any changes since then. I'm currently looking for a Chrome extension that ...
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1answer
150 views

How do I get old blocks while running a pruned node?

Hello I'm trying to build a NodeJS app that fetches Bitcoin blocks, potentially old ones, and I'm running into issues. I've downloaded Bitcoin Core but I don't have enough space to run a full node and ...
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2answers
200 views

Generating Bitcoin address from private key in browser console

I am a newbie Bitcoin evangelist and I have a recommendation to see all the code responsible for computing yourPublicKey from yourPrivateKey, especially for big deal addresses. The easiest way to ...
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1answer
37 views

how to sign a multiple output transaction

currently i m using below code,how to add multiple address to address. let transaction = new bitcore.Transaction() transaction .from(txoSet) .to( ...
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0answers
38 views

How can i mine bitcoins to direct wallet using JavaScript?

I heard that we can mine bitcoins using javascript direct to the wallet? How can I create Program, script or application which direct mines to the wallet & I even search online but did not get ...
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1answer
88 views

How to get BTC transfer amount from raw tx using bitcoinjs

Suppose I have following object console.log(bitcoinjs.Transaction.fromHex(rawTx)); The output Transaction { version: 2, locktime: 1655960, ins: [ { hash: <Buffer dc 4d aa 10 db ...
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0answers
112 views

broadcasting bitcoin transaction issue using bitcore-explorers

I have been trying to do a transaction using bitcore-lib. I have successfully created transaction object. let bitcore_transaction = new bitcore.Transaction() .from(utxos[0]) .to(to, +...
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1answer
35 views

JavaScript Mining System Design

How do I verify a unconfirmed transaction using JavaScript ?
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2answers
629 views

How to use `scantxoutset`

Looking to fetch the UTXOs for a given address and can't seem to find the correct command syntax. Here is an implementation in bitcoin-core via javascript, but I also experience the same on bitcoin-...
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1answer
577 views

Javascript library or code that can convert an “uncompressed” bitcoin private key to a compressed one

I forked a pretty old brain wallet generator: https://dvdbng.github.io/memwallet/ -- Currently it generates uncompressed bitcoin private keys. Is there a javascript library that can convert an ...
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1answer
426 views

how to place a bitforex api buy order

I have read the documentation for BitForex on placing a buy order here: https://github.com/bitforexapi/API_Doc_en/wiki/Order Then after understanding that, I read the API Call Description ...
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1answer
86 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. ...
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1answer
56 views

Using only Javascript and JS related Bitcoin Libraries. How do you extract the Bitcoin Address from a private key?

I'm building an js related application that only stores my user's bitcoin private keys, but not the public key or bitcoin address to save space. Is there a javascript library that can output the ...
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1answer
1k views

How do you sign data with a private key? [javascript]

Using BlockCypher’s signing tool (link), I can sign the following data: 05de69f5d37f41340eed3230f03d2394dde5e497738a76f027b7d962a0cbdf39 with the private key: ...
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1answer
508 views

Creating a raw bitcoin transaction and signing it with the private key using php and javascript

I have a full bitcoin core node setup and would like to use it to just "broadcast" my signed transactions. But what is required to make a raw transaction using PHP and Javascript? The variables I have ...
2
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1answer
31 views

Ardor: How to decide if an asset can be send?

My (Javascript) frontend needs to decide whether the user can send an Ardor/Ignis asset in his account. My code checked for: quantityQNT >= amount_to_send But I realise that this doesn't work if ...
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1answer
7k views

generating private key from bip39 seed

according to bip39, I maked 12 mnemonic words and then get a 512 bit seed from them. now I want to know how must I convert this seed to private key ? what functions must I use ? please introduce me ...
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1answer
520 views

Derive next HD segwit address from xpub/ypub

I've been using the smartbit api to derive the next receiving address for a while now. However it only works for Legacy addresses and not Segwit addresses. I now have a Ledger Nano s and need a ...
2
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1answer
125 views

I have a 100 character text message and I want to encrypt this message with my bitcoin “PUBLIC KEY” and decrypt it with my private key in Javascript

Are there any javascript libraries that can encrypt a 100 character text message using your bitcoin public key, but only be able to decrypt it with your bitcoin private key? I'm looking to create a ...
2
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1answer
1k views

A NodeJS implementation on creating addresses from a Bitcoin (zpub, xpub) address

I'm looking for a lightweight node package which can handle creating btc receiving addresses on the server using an extended public key (segwit). Like this one: ...
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1answer
930 views

UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'fromSeedBuffer' of undefined

I am getting Getting error at this line var root = bitcoin.HDNode.fromSeedBuffer(seed); UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'fromSeedBuffer' of undefined Here is ...
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1answer
227 views

Explain blockexplorer UTXO

Bitcoin testnet I used the following code to obtain info about unspent outputs: const blockchainInfo = require('blockchain.info') const blockexplorer = blockchainInfo.blockexplorer.usingNetwork(3) ...
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1answer
391 views

Ardor API: Not able to use POST requests with Axios due to CORS issues [closed]

I am having issues with POST requests to the Ardor API. This code: <!DOCTYPE html> <html> <head> <script src="https://unpkg.com/axios/dist/axios.min.js"></script> &...
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1answer
300 views

How to make a persistent SPV wallet? (bcoin)

I created a wallet on a SPV node. The wallet is initialized from a mnemonic. After receiving some transactions, the wallet's balance looks like: { account: -1, tx: 3, coin: 3, unconfirmed: 136300, ...
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1answer
212 views

Generating Output Script from Bitcoin.js or other Javascript Library

I'm attempting to use the Ledger Wallet API to sign a multi-sig transaction. The API works as follows: var inputs = [ [ "71f97fa2a21486ecd99674a8ae068d92acd2e9db49c199473be39984e6cbe0f6", "00000000"...
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1answer
62 views

How can I generate the qrcode client-side that would be compatible with the Ardor Wallet qrcode

I'd like to generate a qrcode the same way the Ardor Wallet generates it, such that it would be compatible. I found qrcode related javascript shipped with the Ardor node download in ardor/html/www/js/...
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2answers
101 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 ...
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1answer
203 views

Can you explain this JS code?

Can someone explain this JS code to me please? Maybe line by line? I am trying to understand and learn from it. Is this code creating a raw transaction based on an existing redeemScript? Or is it ...
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1answer
906 views

Creating Testnet Bitcoin Transaction with bitcoinjs-lib

I'm trying to setup a simple bitcoin testnet transaction using the bitcoinjs-lib npm module. It seems like I'm building the transaction correctly, and I receive the hex code but I think I'm unable to ...
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1answer
2k views

Bruteforce bitcoin address - I know the words + public address but not the order

I have a long list of 1million+ permutations of a 12 word BIP39 seed. How can I try them all on a bitcoin address? edit: I know the address and the 12 words but i don't know the order of the words
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1answer
983 views

Javascript library to explore bitcoin blockchain data by connecting to a local running node

I need to get data of a block using the block height. Is there a javascript library to get block data from the Bitcoin blockchain, by connecting to local running node or a 3rd party blockchain ...
4
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1answer
247 views

How do the JavaScript SecureRandom() vulnerabilities affect me?

A recent post on the Bitcoin-dev mailing list talks about multiple vulnerabilities in JavaScript SecureRandom() class. Apparently this class has been used in multiple cryptocurrency wallets that use ...
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5answers
7k views

Ripple testnet explorer

This is Ripple main Explorer. But where can i find the transactions ledger from wallets on Ripple testnet.
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1answer
394 views

How to set up a private chain/local testnet : reverse engineering the blockchain code

Long story short, I want to set up a private chain/a testnet blockchain that can run locally just to fiddle and play with it just to learn how it works. So I have a general understanding of how things ...
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0answers
126 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 ...
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1answer
1k views

Can I use walletnotify or blocknotify remotely with a NodeJS application?

I'd like to get information from my bitcoin node running on a cloud server to be used to make changes in my NodeJS app running on my computer. So, in the bitcoin.conf file, should I have something ...