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0
votes
1answer
16 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
votes
0answers
35 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"...
0
votes
1answer
19 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/...
0
votes
1answer
19 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
votes
1answer
33 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
vote
1answer
69 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
votes
0answers
20 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
122 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
515 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
votes
1answer
177 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
190 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
votes
0answers
144 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
votes
2answers
798 views

Ripple testnet explorer

This is Ripple main Explorer. But where can i find the transactions ledger from wallets on Ripple testnet.
0
votes
0answers
25 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
181 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
vote
0answers
70 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
votes
1answer
440 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
votes
1answer
246 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
107 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
votes
0answers
72 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
vote
4answers
4k 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
490 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
226 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
837 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
912 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
161 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
vote
1answer
131 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
191 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
votes
1answer
89 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
88 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 ...
1
vote
2answers
393 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 ...
5
votes
1answer
5k views

Byte array to hexadecimal and back again in JavaScript

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
252 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
410 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
vote
0answers
255 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
votes
2answers
987 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
420 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
616 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
514 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
220 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
vote
1answer
141 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
594 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
votes
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
vote
0answers
46 views

How to sign messages deterministically with bitcore?

How do you sign messages deterministically with bitcore?
2
votes
3answers
308 views

Is there a website widget or javascript library that turns any Bitcoin address into a clickable widget?

Was wondering is there a javascript widget or library that turns any BTC address on a website into a popup QR code on hover?
1
vote
1answer
231 views

OP_EQUALVERIFY Problem

I'm making a full-service wallet, I already made the UTXOs selection algorithm and now I want to push the transaction hex bytes. It works when I push only a transaction with only 1 input, but if I try ...
0
votes
1answer
373 views

how to make Instant Payment Forwarding [closed]

so basicly im using block io API. this is the respond: { "status" : "success", "data" : { "network" : "BTC", "forwarding_private_key" : "...
5
votes
3answers
9k views

Is there a way to access Ethereum Smart Contract's variables by name in JavaScript?

Say I have a simple smart contract: contract Simple { string32 message; function Simple() { message = "Hello world!"; } } How can I easily access the message variable by name in ...
4
votes
1answer
375 views

Prevent rounding errors when displaying bitcoin values in javascript

What is the correct way to prevent Floating Point Precision errors when displaying bitcon values in javascript? I've seen many answers on the topic, but they all seem to have their drawbacks. Here's ...
1
vote
1answer
2k views

avoid rounding errors in javascript with bigdecimal?

a user submits a buy request: 0.0104 BTC at a rate of 345.92 EUR config: var mode = RoundingMode.HALF_EVEN(); var satoshi = new BigDecimal("100000000"); user input: var btc_b = new BigDecimal("0....