aiascs-blockchain/src/Block.js

Sample Module for blockchain status of entities relate to each other

const SHA256 = require("crypto-js/sha256");

class Block {
  constructor(timeStamp, data, previousHash = "") {
   /**
    * 
    * @data is transaction information in the chain in 
    * our case is the product id/token
    * 
    */ 

    this.timeStamp = timeStamp;
    this.previousHash = previousHash;
    this.data = data;
    this.hash = this.calculateHash();
    this.nonce = 0;
  }

  calculateHash(){
    return SHA256(
        this.previousHash +
        this.timeStamp +
        this.nonce +
        JSON.stringify(this.data)
    ).toString();
  }

  mineBlock(difficult){
    //make hash of a block begin with certain amount of zero,
    // so we will continue to loop until we get that,
    while (
      this.hash.substring(0, difficult) != Array(difficult + 1).join("0")
    ) {
      this.nonce++;
      this.hash = this.calculateHash();
    }
  }
}



module.exports = Block;