Simple Blockchain implementation in Javascript. For educational purposes only.
Simple proof-of-work algorithm Verify blockchain (to prevent tampering) Generate wallet (private/public key) Sign transactions
Install library npm install --save savjeecoin Generate a keypair To make transactions on this blockchain you need a keypair. The public key becomes your wallet address and the private key is used to sign transactions.
const EC = require('elliptic').ec; const ec = new EC('secp256k1');
const myKey = ec.genKeyPair(); The myKey object now contains your public & private key:
console.log('Public key:', myKey.getPublic('hex')); console.log('Private key:', myKey.getPrivate('hex')); Create a blockchain instance Now you can create a new instance of a Blockchain:
const {Blockchain, Transaction} = require('savjeecoin');
const myChain = new Blockchain(); Adding transactions // Transfer 100 coins from my wallet to "toAddress" const tx = new Transaction(myKey.getPublic('hex'), 'toAddress', 100); tx.signTransaction(myKey);
myChain.addTransaction(tx); To finalize this transaction, we have to mine a new block. We give this method our wallet address because we will receive a mining reward:
myChain.minePendingTransactions(myKey.getPublic('hex'));