I'm currently using 0.2x.x version of Web3 Javascript API. I deployed my custom ERC20 token by creating smart contract in solidity (on REMIX IDE). I installed the MetaMask and had a test on https://wallet.ethereum.org/ to send some custom ERC t...
I'm trying to sign a Psbt transaction from bitcoinjs-lib following what I found here:   https://github.com/helperbit/helperbit-wallet/blob/master/app/components/dashboard.wallet/bitcoin.service/ledger.ts  I've checked that the compressed publ...
I,m trying to write smart contracts for Waves Platform, as far as I understood, there are no smart contracts like in Ethereum, there are smart accounts and smart assets, which can validate transactions, but how can I create that smart contracts and a...
I'm trying to make a little web app (just for learning purposes), where I can push on a button, and it will send some bitcoin from (my own) bitcoin wallet A to bitcoin wallet B. I've managed to learn some stuff about bitcoin, the blockchain,...
First I create HD Wallet using BIP32 using mnemonics.  Now I want to generate new child addresses with private key using xpub & xpriv for every receive.  Then, for example, I received BTC in 2 child addresses, i.e. 3 BTC & 2 BTC.  Now, I have...
I try to understand Bitcoin Transactions. I use the Bitcore Javascript Library.  I have a Source Wallet1 (Address1/PublicKey1 and PrivateKey1) - with 10 Bitcoins (simplified).  Now a friend gives me his Wallet2 (Address2/PublicKey2), and wants to rec...
To further extend my understanding of bitcoin I would like to try and build my own SPV-based wallet using the Ionic] (cordova) mobile app framework (hybrid-app).  Using the browserified version of bitcoinjs-lib I have managed to implement all the key...
I have a problem with a very simple Hyperledger Composer applicationnamespace com.softwaremill.drivernetwork  participant Driver identified by licenseId {   o String licenseId   o String firstName   o String lastName   o Boolean licenseValid default...
I am creating a raw transaction using the bitcoin testnet, but when I push the raw transaction onto the network it takes all my balance. Am I suppose to send the remaining 'change' back to myself? Here is the code im using to create the raw t...
before marking this question as a duplicate please notice that I'm not using truffle :)  So the problem is , everytime I send a transaction to my smart contract I get the error from title.  const express = require('express'); const router...

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