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test.js
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test.js
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const SHA256 = require("crypto-js/sha256");
// const x= 2;
class Block {
constructor(blockNumber, timestamp, data, previousHash = '') {
this.blockNumber = blockNumber;
this.previousHash = previousHash;
this.timestamp = timestamp;
this.data = data;
this.hash = this.calculateHash();
this.nounce=this.calculateNounce();
}
calculateHash() {
return SHA256(this.index + this.previousHash + this.timestamp + this.nounce + JSON.stringify(this.data)).toString();
}
calculateNounce(){
return (this.blockNumber+2);
}
}
class Blockchain{
constructor() {
this.chain = [this.createGenesisBlock()];
}
createGenesisBlock() {
return new Block(0, "18/03/2018", "Genesis block", "0");
}
getLatestBlock() {
return this.chain[this.chain.length - 1];
}
addBlock(newBlock) {
newBlock.previousHash = this.getLatestBlock().hash;
newBlock.hash = newBlock.calculateHash();
this.chain.push(newBlock);
}
ChainValid() {
for (let i = 1; i < this.chain.length; i++){
const currentBlock = this.chain[i];
const previousBlock = this.chain[i - 1];
if (currentBlock.hash !== currentBlock.calculateHash()) {
return false;
}
if (currentBlock.previousHash !== previousBlock.hash) {
return false;
}
}
return true;
}
}
let Miner = new Blockchain();
Miner.addBlock(new Block(1, "31/03/2018", { amount: 4 }));
Miner.addBlock(new Block(2, "31/03/2018", { amount: 8 }));
console.log(JSON.stringify(Miner, null, 4));
// // Check if chain is valid (will return true)
// console.log('Blockchain valid? The ans is = ' + Miner.ChainValid());
// // Let's now manipulate the data
// Miner.chain[1].data = { amount: 100 };
// // Check our chain again (will now return false)
// console.log("Blockchain valid? The ans is = " + Miner.ChainValid());