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miner.js
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miner.js
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const SHA1 = require("crypto-js/sha1");
// const x= 2;
class Block {
constructor(blockNumber, nounce, data, previousHash = '') {
this.blockNumber = blockNumber;
this.previousHash = previousHash;
this.data = data;
this.hash = this.calculateHash();
this.nounce=nounce;
}
calculateHash() {
return SHA1(this.blockNumber + this.previousHash + this.nounce + JSON.stringify(this.data)).toString();
}
// calculateNounce(){
// return (this.blockNumber*2);
// }
pangaBlock(difficulty) {
while (this.hash.substring(0, difficulty) !== Array(difficulty + 1).join("0")) {
this.nonce++;
this.hash = this.calculateHash();
}
console.log("BLOCK MINED: " + this.hash);
}
}
class Blockchain{
constructor() {
this.chain = [this.createGenesisBlock()];
this.difficulty = 2;
}
createGenesisBlock() {
return new Block(1, 1, "Genesis block 1", "0");
}
getLatestBlock() {
return this.chain[this.chain.length - 1];
}
addBlock(newBlock) {
newBlock.previousHash = this.getLatestBlock().hash;
newBlock.hash = newBlock.calculateHash();
newBlock.pangaBlock(this.difficulty);//is par sara time lag gaya
this.chain.push(newBlock);
}
isValid() {
// for (let i = 1; i < this.chain.length; i++){
// const currentBlock = this.chain[10]
// this.hash = '00' + calculateHash();
// }
// if (currentBlock.hash !== this.hash) {
// nounce++;
// }
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(2, 2, "data2"));
Miner.addBlock(new Block(3, 3, "data3"));
Miner.addBlock(new Block(4, 4, "data4"));
Miner.addBlock(new Block(5, 5, "data5"));
Miner.addBlock(new Block(6, 6, "data6"));
Miner.addBlock(new Block(7, 7, "data7"));
Miner.addBlock(new Block(8, 8, "data8"));
Miner.addBlock(new Block(9, 9, "data9"));
Miner.addBlock(new Block(10, 10, "data10"));
console.log(JSON.stringify(Miner, null, 4));
// // // Check if chain is valid (will return true)
// console.log('Blockchain valid? The ans is = ' + Miner.isValid());
// // ub ye existing chain ko manipulate kariegy to invalid hojaegi chain
// Miner.chain[1].data = { amount: 100 };
// Miner.chain[1].previousHash = "6287342g42g4u2487";
// // Again check (now it will return false)
// console.log("Blockchain valid? The ans is = " + Miner.isValid());
// console.log('Mining block 1');
// savjeeCoin.addBlock(new Block(1, "20/07/2017", { amount: 4 }));
// console.log('Mining block 2');
// savjeeCoin.addBlock(new Block(2, "20/07/2017", { amount: 8 }));