Why handling value is core to blockchain - See It in Action

Why Handling Value is Core to Blockchain

📖 Scenario: Imagine you want to send digital money to your friend without using a bank. Blockchain helps you do this safely and clearly by handling the value (money) directly between you and your friend.

🎯 Goal: Build a simple program that shows how blockchain handles value by recording transactions between people.

📋 What You'll Learn

Create a list of transactions with sender, receiver, and amount

Add a variable to track the minimum amount to record

Use a loop to filter transactions above the minimum amount

Print the filtered transactions showing value handled

💡 Why This Matters

🌍 Real World

Blockchain is used to securely transfer money or assets without banks. Handling value correctly is key to trust and transparency.

💼 Career

Understanding how value is handled in blockchain helps in jobs like blockchain developer, financial software engineer, and security analyst.

1

Create the initial list of transactions

Create a list called transactions with these exact dictionaries: {'sender': 'Alice', 'receiver': 'Bob', 'amount': 50}, {'sender': 'Bob', 'receiver': 'Charlie', 'amount': 30}, {'sender': 'Alice', 'receiver': 'David', 'amount': 70}

Blockchain / Solidity

# Create the list of transactions
# Your code here

Need a hint?

Use a list with dictionaries inside. Each dictionary has keys 'sender', 'receiver', and 'amount'.

2

Add a minimum amount filter

Create a variable called min_amount and set it to 40 to filter transactions with amounts greater than or equal to this value

Blockchain / Solidity

transactions = [
    {'sender': 'Alice', 'receiver': 'Bob', 'amount': 50},
    {'sender': 'Bob', 'receiver': 'Charlie', 'amount': 30},
    {'sender': 'Alice', 'receiver': 'David', 'amount': 70}
]
# Create min_amount variable
# Your code here

Need a hint?

Just create a variable named min_amount and set it to 40.

3

Filter transactions by minimum amount

Create a list called filtered_transactions using a list comprehension that includes only transactions from transactions where the amount is greater than or equal to min_amount

Blockchain / Solidity

transactions = [
    {'sender': 'Alice', 'receiver': 'Bob', 'amount': 50},
    {'sender': 'Bob', 'receiver': 'Charlie', 'amount': 30},
    {'sender': 'Alice', 'receiver': 'David', 'amount': 70}
]
min_amount = 40
# Create filtered_transactions list with transactions having amount >= min_amount
# Your code here

Need a hint?

Use a list comprehension to pick transactions where the amount is at least min_amount.

4

Print the filtered transactions

Write a print statement to display the filtered_transactions list

Blockchain / Solidity

transactions = [
    {'sender': 'Alice', 'receiver': 'Bob', 'amount': 50},
    {'sender': 'Bob', 'receiver': 'Charlie', 'amount': 30},
    {'sender': 'Alice', 'receiver': 'David', 'amount': 70}
]
min_amount = 40
filtered_transactions = [t for t in transactions if t['amount'] >= min_amount]
# Print the filtered_transactions list
# Your code here

Need a hint?

Use print(filtered_transactions) to show the result.