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...
not sure if I should post this on the Ethereum SE but I have a feeling it is more javascript related, so I'll try here:   I have a very simple smart contract that consists of essentially just a getNum function and a setNum function.  The smart co...
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 am playing with a private Ethereum blockchain, and I am interested in implementing some smart contracts. However, information is very limited since this is a newer implementation of the blockchain.  Just as an example, say I want a contract that ho...
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...
Relevant Information before starting : I've seached stackoverflow already, and have found similar title questions, but I don't believe they are duplicates of mine, because they have a key difference, they seem to have objects which contain a...

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