A Solana NFTs Marketplace Question

[cuongnguyengit]

Hi team,

I'm new for solana and blockchain and i has a task about Solana NFTs. My task is descibed as below:
Task: Make a game account (Username and password) Marketplace Web3 using Solana NFTs.
-> This is a personal project, not a business

My website has the following functions:

1. Connect Wallet (easy to wallet-adapter lib)
2. Create NFTs (easy with your course) and the sensitive data (Username and password) is stored and is visible by owner of the corresponding NFT owner => I have no solution
3. Show all NFTs which created by my website. => I have no solution
4. Buyer clicks to buy a NFT. => I have no solution
5. Seller clicks to agree sell the NFT => I have no solution

I think buyer need to transfer SOL token to seller and then seller will change owner NFT to buyer, but problem is still the sensitive data. How does the sensitive data is secret and how do website put them to the new owner safety.

Hope to receive your response soon.

Thank you.