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Questions tagged [javascript]

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0
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0answers
32 views

How to use this nodejs script (by:Raghav Sood) that have been posted on the stackexchange

I'm new to javascript I'm trying to use this script from this post (made by Raghav Sood) : Bruteforce bitcoin address - I know the words + public address but not the order var bip39 = require('bip39'...
1
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1answer
32 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
votes
1answer
35 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: ...
0
votes
1answer
51 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 ...
0
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1answer
33 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) ...
1
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1answer
30 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> &...
0
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1answer
60 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, ...
0
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0answers
65 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"...
1
vote
1answer
25 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
44 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 ...
-1
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1answer
72 views

How to Create Bitcoin Cash HD Walllet in Javascript

I am trying to create a Bitcoin Cash HD wallet through mnemonic phrase, but I don't know any npm package that is compatible with HD wallets and Bitcoin Cash. Could someone help me build the BCH HD ...
1
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1answer
82 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 ...
0
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0answers
26 views

Komodo (KMD) javascript library

Is there any officially supported library for operating on KMD blockchain? Desired features: Create wallet Save private key as HEX, WIF, Mnemonic Restore address from private key Build transaction ...
1
vote
1answer
268 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 ...
2
votes
1answer
620 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
0
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1answer
277 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 ...
5
votes
1answer
199 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 ...
0
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0answers
275 views

How to use RPC javascript to connect to bitcoin daemon running in the server?

I'm new in RPC. I developed a board which use many coin to exchange . But my board is based on other website api to get the BTC address for users. And i want it to be independent. So i was searching ...
4
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3answers
1k views

Ripple testnet explorer

This is Ripple main Explorer. But where can i find the transactions ledger from wallets on Ripple testnet.
0
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0answers
30 views

Where to get api to fetch list of all crypto exchange and their available pairs

I have searched too much but I didn't find any php or js api to fetch list of all crypto exchange with available pairs. Please help me.
0
votes
1answer
233 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 ...
1
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0answers
73 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
529 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 ...
0
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1answer
279 views

Signature for this request is not valid

im testing the binance api but cant get over the signature problem can u spot a mistake on my signature?: const crypted = CryptoJs.HmacSHA256("timestamp=" + new Date().getTime().toString() + "&...
0
votes
1answer
121 views

How does a mining pool coordinate with different Javascript clients?

I've been reading a little about those web sites taht surreptitiously had Javascript running on the page that is mining cryptocurrency. How do those pieces of JS work code generally? Specifically ...
0
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0answers
77 views

APIs differences - tickers explanation

Let's suppose we have 2 APIs available - node-bittrex-api and binance-api-node. In Bittrex I can subscribe to receive all the tickers (pretty much every 5 seconds) without the need to specify the ...
1
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4answers
5k views

Is bitdigger chrome extension is fraud?

Today, while I was watching the video on youtube, I found the video on the bitdigger extension that mine bitcoins with chrome browser. I just want to know is it fraud or legit? Is it possible mining ...
2
votes
2answers
588 views

How can I check the hash of a bitcoin block?

Let's pick an example bitcoin block: #499583 This is the block: https://insight.bitpay.com/api/rawblock/000000000000000000677c4077da7c9f01dde5f332ba2fbff962ee699714d5da It starts with ...
1
vote
2answers
234 views

Help finding a “throttle-able” Javascript based miner?

I am trying to find a Javascript based miner that is able to be throttled or capped at say 10% CPU usage, do any of you know of one? If not, do any of you know how to create a throttle for a JS-based ...
0
votes
1answer
901 views

Coinhive for bitcoin/ethereum

I know that CPU mining wouldn't pay for electricity bill, but what if some sort of CPU miner was deployed to a website? Similarly to CoinHive with Monero. Would such mining make sense? I started ...
5
votes
1answer
1k views

How do I remove Wallet from Bcoin?

I'm playing with bcoin cli and created lots of wallets. Is there any way to remove wallet via WalletDB Api?
2
votes
1answer
162 views

Bcoin - Database backend not found

/root/BCoin/node_modules/bcoin/lib/db/backends.js:16 throw new Error('Database backend "' + name + '" not found.'); ^ Error: Database backend "leveldown" not found. at Object.get (/root/...
1
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1answer
145 views

Bcoin crashes with node version error

I installed bcoin and I get this error about the version: $ node -v v8.2.1 $ npm -v 5.3.0 $ bcoin /usr/lib/node_modules/bcoin/lib/db/backends.js:26 throw e; ^ Error: The module '/usr/lib/...
3
votes
1answer
210 views

How do I get transactions from the Bitcoin Blockchain with bcoin?

Is this possible with bcoin? Do I need a full node to get transactions or does it work with an SPV?
2
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1answer
95 views

Resyncing bcoin brings up database version error

I was resyncing my bcoin node and got the following error: Error: Warning: Your database does not match the current database version. This is likely because the database layout or serialization ...
0
votes
1answer
89 views

General Block Chain questions / Js Block Chain [closed]

First of all. I'm very new to block chain technology so please forgive any noob questions. So I'm going a lot on the following tutorial on youtube regarding the knowledge that I do have other than ...
2
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2answers
403 views

how to use bitcoin blockchain be useful to authenticate documents?

have read a little about blockchains and found there is lot of blockchain npm libraries available. How can I take benefit of the bitcoin blockchain to authenticate documents : to obtain a proof a ...
6
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1answer
7k views

Byte array to hexadecimal and back again in JavaScript [on hold]

I can generate a byte array with var myByteArray = window.crypto.getRandomValues(new Uint8Array(16)) and I get 181,143,16,173,231,56,63,149,181,185,224,124,84,230,123,36 I can then turn this into ...
0
votes
1answer
273 views

Is it possible to talk to bitcoin RPC API with Javascript and WITHOUT using a node server?

I am planning on building a Wallet and want to know if I can hook something like an Electron native JavaScript app to Bitcoin RPC without running node.js for the server calls, so using something like ...
5
votes
1answer
509 views

how do you sign and verify a message that you own a bitcoin address using javascript?

Is there a bitcoin library or even just pure javascript way of signing and verifying you own a btc address?
1
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0answers
267 views

Decrypting BitcoinJ/MultiBit key (scrypt/aes-256) from protobuf with NodeJS

I'm trying to decrypt an encrypted private key from an encrypted Multibit Classic .wallet file but the resulting public key / wif doesn't match the original. Here is my code: 'use strict' var fs = ...
0
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2answers
1k views

What are the best JavaScript libraries to accept Bitcoin payments?

I used search engine "accept bitcoin payments" and: https://bitpay.com/ - top result in my google charges 1% fee and requires some verification Stripe charges 0.8% - https://stripe.com/bitcoin - ...
2
votes
1answer
436 views

How to send portion of funds from a private key programmatically?

I'm building an app and one of my features is being able to scan a bitcoin private key and then send a portion of its funds to another address. How can I do something like this in javascript or php? ...
4
votes
2answers
641 views

Is the generated Public Key from Private Key Unique in Bitcoin?

I am generating public key from my private key. I did in Java script and C#. but generated public keys are different. My Code in c# (KeyCore.NET): PrivateKey pv = new PrivateKey(Globals....
3
votes
1answer
553 views

How can I verify my merkle root function is correct?

I've started playing with Bitcoin on a more technical level recently (I'm an experienced software developer but just a user of Bitcoin up until now). I'm trying to implement a function to calculate a ...
3
votes
2answers
236 views

What's the POST endpoint to broadcast a transaction in copay's server?

AFAIU, copay's server implementation is bitcore-wallet-service. From its README, I can deduce that a multi-sig wallet will use the /v1/txproposals/ endpoint to create a new transaction proposal that ...
1
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1answer
148 views

Bitcoin - BitGO - Save all wallet objects into Array of Objects

My Setup: With the help of Mongoose module we handle all Mongo Database operations. For each new user a wallet is generated and stored inside a Mongo collection. METHOD: If we use User.find({}, ...
2
votes
1answer
630 views

Bitfinex get credits and convert timestamp to JS Date

I'm fetching my active credits in BFX and trying to discover when I'll have my funding back. This is a response example: /v1/credits [{ amount: "294.4316181", currency: "USD", id: ...
10
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3answers
12k views

Javascript Bitcoin miner is it even worth it?

I know that mining bitcoins via JavaScript is just pointless at this point in time, but is there any other altcoin that is worthwhile mining via a GPU/CPU via a JavaScript embedded into a web page? ...
1
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0answers
46 views

How to sign messages deterministically with bitcore?

How do you sign messages deterministically with bitcore?