Sending transactions in Blockchain / Solidity - Mini Project: Build & Apply

Sending transactions

📖 Scenario: You are building a simple blockchain wallet app. You want to send cryptocurrency from your wallet to a friend's wallet.

🎯 Goal: Create a program that sets up a transaction with sender, receiver, and amount, configures a transaction fee, builds the transaction data, and then outputs the transaction details.

📋 What You'll Learn

Create a dictionary called transaction with keys sender, receiver, and amount with exact values

Create a variable called fee and set it to the exact value 0.001

Create a new dictionary called full_transaction that includes all keys from transaction plus the fee

Print the full_transaction dictionary

💡 Why This Matters

🌍 Real World

Sending transactions is a core part of blockchain wallets and apps. This project shows how to prepare transaction data before sending it to the blockchain network.

💼 Career

Blockchain developers and engineers often need to build and manage transaction data structures to interact with blockchain networks securely and correctly.

1

Create the initial transaction data

Create a dictionary called transaction with these exact entries: 'sender': '0xABC123', 'receiver': '0xDEF456', and 'amount': 10.

Blockchain / Solidity

# Your code here

Need a hint?

Use curly braces to create a dictionary with the keys and values exactly as shown.

2

Set the transaction fee

Create a variable called fee and set it to the float value 0.001.

Blockchain / Solidity

transaction = {'sender': '0xABC123', 'receiver': '0xDEF456', 'amount': 10}
# Your code here

Need a hint?

Just assign the number 0.001 to the variable named fee.

3

Build the full transaction data

Create a new dictionary called full_transaction that contains all keys and values from transaction plus a new key 'fee' with the value from the variable fee.

Blockchain / Solidity

transaction = {'sender': '0xABC123', 'receiver': '0xDEF456', 'amount': 10}
fee = 0.001
# Your code here

Need a hint?

Use dictionary unpacking {**transaction, 'fee': fee} to add the fee key.

4

Print the full transaction

Write a print statement to display the full_transaction dictionary.

Blockchain / Solidity

transaction = {'sender': '0xABC123', 'receiver': '0xDEF456', 'amount': 10}
fee = 0.001
full_transaction = {**transaction, 'fee': fee}
# Your code here

Need a hint?

Use print(full_transaction) to show the transaction details.