# NFT metadata standards

## Off-Chain Metadata

An NFT is a unique ID. On-chain data contains this ID coupled with additional important information like ownership, royalties, and more. However, media and metadata are stored off-chain for performance and flexibility. These data must be carefully written to guarantee compatibility across the tools and dApps of the ecosystem. [Ternoa Improvement Proposal](https://github.com/capsule-corp-ternoa/ternoa-proposals/tree/main/TIPs) (TIPs) propose structures adopted from ERC-1155 to ensure this compatibility.

Here below are listed the expected format for each feature:

#### Basic NFT

```json
{
  "title": "Title of the NFT",
  "description": "Description of the NFT",
  "image": "Hash of the media",
  "properties": {
    "media": {
      "hash": "Hash of the media",
      "type": "Type of the media (file format)",
      "size": "Size of the media"
    }
  }
}
```

#### Secret NFT

```json
{
  "title": "(OPTIONAL) Title of the Secret NFT",
  "description": "(OPTIONAL) Description of the Secret NFT",
  "properties": {
    "encrypted_media": {
      "hash": "Hash of the encrypted media",
      "type": "Type of the encrypted media (file format)",
      "size": "Size of the encrypted media",
      "name": "(OPTIONAL) Name of the encrypted media",
      "description": "(OPTIONAL) Description of the encrypted media"
    },
    "public_key_of_nft": "Public key associated with the Secret NFT"
  }
}
```

#### Collection

```json
{
  "name": "Name of the collection",
  "description": "Description of the collection",
  "banner_image": "Hash of the collection's banner image",
  "profile_image": "Hash of the collection's profile image"
}
```

#### Marketplace

```json
{
  "name": "Name of the marketplace",
  "logo": "Hash of the marketplace's logo"
}
```


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