blockchainutility v1.0.3

// blockchainUtility.js

class Block { constructor(index, timestamp, data, previousHash = '') { this.index = index; this.timestamp = timestamp; this.data = data; this.previousHash = previousHash; this.hash = this.calculateHash(); }

calculateHash() {
    return CryptoJS.SHA256(this.index + this.previousHash + this.timestamp + JSON.stringify(this.data)).toString();
}

}

class Blockchain { constructor() { this.chain = this.createGenesisBlock(); }

createGenesisBlock() {
    return new Block(0, "01/01/2022", "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);
}

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;
}

}

module.exports.Blockchain = Blockchain; module.exports.Block = Block;