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 generate the public key from the following x and y of  object Q in the browser. The problem is in order to use this public key for verifying a JWT I have to get the hexadecimal format of the key. I'm using keypair from the src=&...
I am trying to create wallet on Blockchain using Ajax but I am getting "Cross-Origin Request Blocked" error. My Ajax call is:  $.ajax({                     type: 'POST',                     url: 'https://blockchain.info/api/v2/cre...
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 trying to get a bitcoin address info using the Blockchain.info API but it doesn't work. I get allways the same error:  XMLHttpRequest cannot load https://blockchain.info/address/13DKdDeZcdLbGoNquWz8nHBnVpfBVkDitz?format=json. No 'Acce...
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...
Im trying to sign a bitcoin testnet transaction using blockcypher but when I go to send the transaction I get the error:  Error building input: Error generating scriptsig when building transaction: Invalid signature: Non-canonical signature: wrong le...
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...

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