# Personality Data

### Immutable Data vs. Mutable Data

Each Personality NFT has both Immutable and Mutable Data, making it very easy to Buy, Sell, Transfer, Upgrade and Downgrade your NFT.

#### Immutable Data

This is Data that never changes and follows the NFT.

1. **Mint Number**: This is a unique ID of when you minted your NFT
2. **Discount Code:** Your Discount Code will never change.
3. **Earnings**: Earnings always go to the Address that holds the NFT.
4. **Referral Code:** If a referral code was used during purchase, it will be added to the metadata and be immutable.

#### Mutable Data

This is Data that can be changed and updated.

1. **Personality Traits:** Can be updated after purchasing an NFT or transferring an NFT.
2. **Rarity**: Can be upgraded and downgraded using a Rarity Card.
3. **Yield**: Can be upgraded and downgraded using a Rarity Card.
4. **Earnings Amount**: Updated as earnings increase.

### Selling Rarity vs. Selling Earnings

There are two components that you can sell. You can sell your level of Rarity or you can sell the Earnings of the NFT. If you want to sell the Rarity, simply downgrade your NFT and sell the higher Rarity Card.

***If you want to sell just the earnings, then sell the Personality NFT.***

### What Happens when your Sell or Transfer your NFT

When a Personality NFT is sold or Transferred, the personality data is no longer valid, and the new owner can update the Personality NFT according to their Personality Test Results. 


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