Token metadata and URI in Blockchain / Solidity - Mini Project: Build & Apply

Token metadata and URI

📖 Scenario: You are creating a simple blockchain token system. Each token has metadata like name, description, and an image URI. This metadata helps wallets and apps show useful info about the token.

🎯 Goal: Build a Python dictionary to store token metadata and a URI string. Then create a new dictionary that combines them, and finally print the full token info.

📋 What You'll Learn

Create a dictionary called token_metadata with keys 'name', 'description', and 'image' and exact values.

Create a string variable called token_uri with the exact value.

Create a new dictionary called full_token_info that includes all token_metadata plus the token_uri under key 'uri'.

Print the full_token_info dictionary.

💡 Why This Matters

🌍 Real World

Token metadata and URI are used in blockchain tokens like NFTs to provide details that wallets and marketplaces show to users.

💼 Career

Understanding how to manage token metadata is important for blockchain developers working on smart contracts, NFT platforms, and crypto wallets.

1

Create token metadata dictionary

Create a dictionary called token_metadata with these exact entries: 'name': 'CryptoKitty', 'description': 'A cute blockchain cat', and 'image': 'https://example.com/cat.png'.

Blockchain / Solidity

# Create the token_metadata dictionary with name, description, and image
# Your code here

Need a hint?

Use curly braces {} to create a dictionary. Put keys and values inside with colons.

2

Create token URI string

Create a string variable called token_uri and set it to 'https://example.com/token/123'.

Blockchain / Solidity

token_metadata = {
    'name': 'CryptoKitty',
    'description': 'A cute blockchain cat',
    'image': 'https://example.com/cat.png'
}
# Create the token_uri string
# Your code here

Need a hint?

Use an equals sign = to assign the string to the variable token_uri.

3

Combine metadata and URI into full token info

Create a new dictionary called full_token_info that contains all key-value pairs from token_metadata plus a new key 'uri' with the value from token_uri.

Blockchain / Solidity

token_metadata = {
    'name': 'CryptoKitty',
    'description': 'A cute blockchain cat',
    'image': 'https://example.com/cat.png'
}
token_uri = 'https://example.com/token/123'
# Create full_token_info dictionary combining token_metadata and token_uri
# Your code here

Need a hint?

Use dictionary unpacking {**token_metadata, 'uri': token_uri} to combine dictionaries.

4

Print the full token info

Write a print statement to display the full_token_info dictionary.

Blockchain / Solidity

token_metadata = {
    'name': 'CryptoKitty',
    'description': 'A cute blockchain cat',
    'image': 'https://example.com/cat.png'
}
token_uri = 'https://example.com/token/123'
full_token_info = {**token_metadata, 'uri': token_uri}
# Print the full_token_info dictionary
# Your code here

Need a hint?

Use print(full_token_info) to show the dictionary on screen.