alexpanasUCLA

alexpanasUCLA

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0;

contract Ownable
{	
// Variable that maintains
// owner address
address private _owner;

// Sets the original owner of

alexpanasUCLA

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0;

contract check_private {

     // Declaring private variable 
    uint private _number =2; 

  // Can you check what is private variable
      // from the contract ? 

alexpanasUCLA

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0;
 
// Defining parent contract 
contract School { 
 
    // Declaring variable in the parent contract 
  
    string public school = "Shmorse School of Solidity"; 
    

alexpanasUCLA

#!/bin/bash

# Prerequisites (macOS):
# - aws cli => to create AWS resources
#   => pip install --upgrade --user awscli
#   => aws configure

# - jq => to parse JSON results returned by the AWS CLI
#   => brew install jq

alexpanasUCLA

class Blockchain {
  
  // Method 1: Initiate, and store blockchain in LevelDB

  constructor(){
    this.chain = level('./blockchaindata');
    this.chain.put(0,JSON.stringify(Block.genesisBlock()))
  }

  // Method 2: Add new block to LevelDB

alexpanasUCLA

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

class Block {
	constructor(data){
     this.hash = "",
     this.height = 0,
     this.body = data,
     this.time = 0,
     this.previousBlockHash = ""
    }