ERC-721 defines a standard for non-fungible tokens (NFTs) on Ethereum. “Non-fungible” means tokens are unique: each token represents a distinct collectible or asset. ERC-721 assigns an owner to each token ID and defines transfer and approval mechanisms. Metadata is typically provided via a tokenURI function pointing to off-chain JSON.

Ownership and token IDs
Full content is available with a subscription.
Get full access to all courses on the platform for one year with a single payment.
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.