BitcoinSimulator

Bitcoin Simulator - BlockChain Implementation in Javascript Language along with implementation of OOPs Concepts. A Decentralised network and Secure system to demonstrate the Working of blockchain.

Block Explorer

An Interface to track the blocks, address, transcactions. Link

The Structure of the blockchain is :-

Blockchain class

class BlockChain {
	constructor() {
		this.chain = [];
		this.pendingTransactions = [];
		this.currentNodeUrl = currentNodeUrl;
		this.networkNodes = [ ... //List of all the nodes in the network...];

		this.createNewBlock(100, '0', '0'); //Genesis Block
	}
  	createNewBlock(nonce, previousBlockHash, hash) {
		const newBlock = {
			index: this.chain.length + 1,
			timestamp: Date.now(),
			transactions: this.pendingTransactions,
			nonce: nonce,
			hash: hash,
			previousBlockHash: previousBlockHash
		};

		this.pendingTransactions = [];
		this.chain.push(newBlock);

		return newBlock;
	}
  //Other Functions(Features)
 }

Features and functions

The features that are added to the blockchain class:-

• A proof of work algorithm to secure the network.

The proof-of-work is a mechanism for reaching global consensus on the valid blockchain: since all nodes have a copy of the blockchain, each node must agree on the conditions that prove how much effort a node has spent on verifying transactions.

To make the calculation difficult, every identification code must start with 0000 (four zeros). To do this we have to add a new field called NONCE.

proofOfWork(previousBlockHash, currentBlockData) {
		let nonce = 0;
		let hash = this.hashBlock(previousBlockHash, currentBlockData, nonce);
		while (hash.substring(0, 4) !== '0000') {
			nonce++;
			hash = this.hashBlock(previousBlockHash, currentBlockData, nonce);
		}
		return nonce;
	}

• Hashing algorithms to secure the data within the blockchain.
• The ability to mine (create) new blocks that contain data.
• The ability to create transactions and store them in blocks.
• An API/server that will be used to interact with the blockchain from the internet.
• It will be hosted on a decentralized blockchain network.
• A consensus algorithms to verify that the network nodes have valid data and are synchronized.
• A broadcasting system to keep the data in the blockchain network synchronized.

Structure of blockchain

Structure of blocks inside the chain