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main.js
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main.js
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var crypto = require("crypto");
class BlockChain {
constructor() {
this.chain = [this.createGenesisBlock()];
this.difficulty = 1;
this.pendingTrasactions = [];
this.miningReward = 100;
}
createGenesisBlock() {
return new Block(0, "01/01/2022", "Genesis Block");
}
getLastBlock() {
return this.chain[this.chain.length - 1];
}
/*
addBlock(block) {
block.previousHash = this.getLastBlock().hash;
// block.hash = block.calculateHash();
block.mineBlock(this.difficulty)
this.chain.push(block);
}
*/
minePendingTransactions(miningRewardAddress) {
let block = new Block(Date.now(), this.pendingTrasactions);
block.mineBlock(this.difficulty);
console.log("Block mined successfully!");
this.chain.push(block);
console.log(
"fromAddress: ",
this.pendingTrasactions[this.pendingTrasactions.length - 1].fromAddress
);
if (
this.pendingTrasactions[this.pendingTrasactions.length - 1].fromAddress !=
null
) {
this.pendingTrasactions[
new Transaction(null, miningRewardAddress, this.miningReward)
];
}
}
createTransaction(transaction) {
this.pendingTrasactions.push(transaction);
}
getBalance(address) {
let balance = 0;
for (const block of this.chain) {
for (const trans of block.transaction) {
if (trans.fromAddress === address) balance -= trans.amount;
if (trans.toAddress === address) balance += trans.amount;
}
}
return balance;
}
isChainValid() {
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;
}
}
class Block {
constructor(timestamp, transaction, previousHash = "") {
this.timestamp = timestamp;
this.transaction = transaction;
this.previousHash = previousHash;
this.hash = this.calculateHash();
this.nonce = 0;
}
calculateHash() {
const data =
this.timestamp +
JSON.stringify(this.transaction) +
this.previousHash +
this.nonce;
const hash = crypto.createHash("sha256").update(data).digest("hex");
return hash.toString();
}
mineBlock(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 Transaction {
constructor(fromAddress, toAddress, amount) {
this.fromAddress = fromAddress;
this.toAddress = toAddress;
this.amount = amount;
}
}
let mBlockChain = new BlockChain();
// console.log("Mine block 1...");
// mBlockChain.addBlock(new Block(Date.now(), { amount: 10 }));
// console.log("Mine block 2...");
// mBlockChain.addBlock(new Block(Date.now(), { amount: 100 }));
// console.log("Mine block 3...");
// mBlockChain.addBlock(new Block(Date.now(), { amount: 50 }));
// console.log(JSON.stringify(mBlockChain, null, 4));
// console.log("is BlockChain valid? " + mBlockChain.isChainValid());
// mBlockChain.chain[2].transaction = { amount: 500 };
// console.log(JSON.stringify(mBlockChain.chain[2], null, 4));
// console.log("is BlockChain valid? " + mBlockChain.isChainValid());
// mBlockChain.chain[2].hash = mBlockChain.chain[2].calculateHash();
// mBlockChain.chain[3].previousHash = mBlockChain.chain[2].hash;
// mBlockChain.chain[3].hash = mBlockChain.chain[3].calculateHash();
// console.log("is BlockChain valid? " + mBlockChain.isChainValid());
mBlockChain.createTransaction(new Transaction("address1", "address2", 100));
mBlockChain.createTransaction(new Transaction("address2", "address1", 10));
mBlockChain.minePendingTransactions("minerAddress");
console.log("minerAddress:", mBlockChain.getBalance("minerAddress"));
console.log("address1:", mBlockChain.getBalance("address1"));
console.log("address2:", mBlockChain.getBalance("address2"));
mBlockChain.minePendingTransactions("minerAddress");
console.log("minerAddress:", mBlockChain.getBalance("minerAddress"));
console.log("address1:", mBlockChain.getBalance("address1"));
console.log("address2:", mBlockChain.getBalance("address2"));