Multi-signature wallet concept in Blockchain / Solidity - Mini Project: Build & Apply

Multi-signature Wallet Concept

📖 Scenario: You are building a simple model of a multi-signature wallet. This wallet requires multiple owners to approve a transaction before it can be executed. This is like a shared bank account where several people must agree before money is spent.

🎯 Goal: Create a program that stores wallet owners, sets a minimum number of approvals needed, collects approvals for a transaction, and checks if the transaction can be executed.

📋 What You'll Learn

Create a list called owners with exactly these names: 'Alice', 'Bob', 'Charlie'

Create an integer variable called required_approvals and set it to 2

Create a list called approvals that will store the names of owners who approve the transaction

Write a loop to add approvals from owners to approvals until the number of approvals equals required_approvals

Print Transaction approved if the number of approvals is enough, otherwise print Transaction pending

💡 Why This Matters

🌍 Real World

Multi-signature wallets are used in blockchain to increase security by requiring multiple people to approve transactions.

💼 Career

Understanding multi-signature wallets is important for blockchain developers and security engineers working with cryptocurrencies.

1

Create the wallet owners list

Create a list called owners with these exact names: 'Alice', 'Bob', 'Charlie'

Blockchain / Solidity

# Create the list of wallet owners
# Your code here

Need a hint?

Use square brackets [] to create a list and separate names with commas.

2

Set the required number of approvals

Create an integer variable called required_approvals and set it to 2

Blockchain / Solidity

owners = ['Alice', 'Bob', 'Charlie']
# Set the number of required approvals
# Your code here

Need a hint?

Use = to assign the value 2 to the variable required_approvals.

3

Collect approvals from owners

Create an empty list called approvals. Then use a for loop with variable owner to iterate over owners. Inside the loop, add owner to approvals until the length of approvals equals required_approvals. Use break to stop the loop when enough approvals are collected.

Blockchain / Solidity

owners = ['Alice', 'Bob', 'Charlie']
required_approvals = 2
# Create an empty list for approvals
# Use a for loop to add owners to approvals until required_approvals is reached
# Your code here

Need a hint?

Start with an empty list. Add each owner to it. Stop when you have enough approvals.

4

Check and print transaction status

Write an if statement to check if the length of approvals is greater than or equal to required_approvals. If yes, print Transaction approved. Otherwise, print Transaction pending.

Blockchain / Solidity

owners = ['Alice', 'Bob', 'Charlie']
required_approvals = 2
approvals = []
for owner in owners:
    approvals.append(owner)
    if len(approvals) == required_approvals:
        break
# Check if approvals are enough and print the status
# Your code here

Need a hint?

Use print() to show the result. Compare the number of approvals with the required number.