Non-fungible tokens

This lesson focuses on Non-Fungible Tokens (NFTs) and their unique properties in proving digital asset ownership.

Non-fungible tokens, or NFTs, offer a unique way to prove digital asset ownership. While traditional fungible tokens are interchangeable and store a value, NFTs carry cryptographic certificates that demonstrate the owner's authority over an asset, like digital art or gaming assets.

$$address → token\_id$$

The main functions of the contract of such tokens are similar to fungible tokens:

1. transfer(to, token_id) - Use the transfer function to send a token (token_id) to the designated recipient (to) without requiring a sender account since each token has its owner.
2. approve(approved_account, token_id) - Utilize the approve function to grant disposal rights of a token (token_id) to a specified account (approved_account). This is particularly useful in marketplaces or auctions, where owners can sell their tokens by transferring ownership to a new buyer.
3. mint(to, token_id, metadata) - Generate a new token using the mint function, specifying the recipient (to), token identifier (token_id), and associated metadata. Metadata can encompass various details about the token, such as resource links or descriptions.
4. burn(from, token_id) - Remove a token (token_id) from the contract by invoking the burn function with the account (from) holding the token.