Example of deploying a web application on AWS

 Example of deploying a web application on AWS

Create an Amazon EC2 instance and install the necessary software, such as a web server and database.

Configure security groups and firewall rules to control access to the instance.

Set up a domain name and DNS records to point to the instance's IP address.

Deploy the web application code to the instance and configure the web server to serve the application.

Set up automated backups and scaling to ensure high availability and scalability.

Blockchain:

Blockchain involves creating a decentralized, tamper-proof ledger of transactions or data using cryptographic techniques. It typically involves using blockchain platforms such as Ethereum or Hyperledger to create and manage blockchain networks.

Example of creating a simple blockchain using Python:

import hashlib

import json

from time import time

class Blockchain:

    def __init__(self):

        self.chain = []

        self.current_transactions = []

        # Create the genesis block

        self.new_block(previous_hash=1, proof=100)

    def new_block(self, proof, previous_hash=None):

        # Create a new block in the blockchain

        block = {

            'index': len(self.chain) + 1,

            'timestamp': time(),

            'transactions': self.current_transactions,

            'proof': proof,

            'previous_hash': previous_hash or self.hash(self.chain[-1]),

        }

        self.current_transactions = []

        self.chain.append(block)

        return block

    def new_transaction(self, sender, recipient, amount):

        # Add a new transaction to the current list of transactions

        self.current_transactions.append({

            'sender': sender,

            'recipient': recipient,

            'amount': amount,

        })

        return self.last_block['index'] + 1

    @staticmethod

    def hash(block):

        # Create a SHA-256 hash of a block

        block_string = json.dumps(block, sort_keys=True).encode()

        return hashlib.sha256(block_string).hexdigest()

    @property

    def last_block(self):

        # Return the last block in the blockchain

        return self.chain[-1]