aiascs-blockchain/src/BlockChain.js

Sample Module for blockchain status of entities relate to each other

const BlockChainSchema = require('../src/model/BlockSchema');
const Block = require("./Block");

class BlockChain {
    constructor(){
      //this is collection of block
      this.chain = BlockChainSchema(this.createGenesisBlock())
      this.difficult = 1;
    }
  
    createGenesisBlock(){
      return new Block("01/01/2021", "Genesis Block", "0");
    }
  
    getLatestBlock(){
      return this.chain[this.chain.length - 1];
    }
  
    addBlock(newBlock){
      // set the previous hash
      newBlock.previousHash = this.getLatestBlock().hash;
      newBlock.mineBlock(this.difficult);
      //newBlock.hash = newBlock.calculateHash();
      this.chain.push(newBlock);
    }
  
    isChainValid() {
      for (let blockIndex = 1; blockIndex < this.chain.length; blockIndex++) {
        const currentBlock = this.chain[blockIndex];
        const previousBlock = this.chain[blockIndex - 1];
  
        //check if hash of the block is still valid
        if (currentBlock.hash != currentBlock.calculateHash()) {
          return false;
        }
  
        //check if current block point to previous block
        if (currentBlock.previousHash != previousBlock.hash) {
          return false;
        }
      }
      return true;
    }
  }

  module.exports = BlockChain;