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 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,...
I'm using Redux in my React App, currently only have 1 reducer at the moment for a Portfolio of cryptocurrencies. Just an array of coins.  When I dispatch my ADD_COIN action the first time I get back an Array of 1 object which is expected. Howeve...
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 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...
I have coin currency market application and I would like to integrate a graph in it, however I don't know from where data should be taken. Is there some API that I can integrate into my highcharts in order to get graphical representation of value...
Im trying to sign a BlockCypher transaction on the bitcoin testnet using bitcoinjs as described here but I keep getting the error:  {"error": "Couldn't deserialize request: invalid character 'x' in literal true (expecting '...
I have been trying to install bitcore using npm version 3.8.7 but keep getting the following error:  any help would be much appreciated      npm ERR! Darwin 14.4.0   npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "i"...

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