> ## Documentation Index
> Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt
> Use this file to discover all available pages before exploring further.

# CrossmintNftService

> Flutter Class

**Class**

On-chain NFT service for VC operations: burn checks, token URIs, and contract metadata URIs.

```dart theme={null}
class CrossmintNftService
```

## Constructors

### CrossmintNftService

```dart theme={null}
CrossmintNftService({CrossmintVcConfig? config})
```

## Methods

### isBurnt

```dart theme={null}
Future<bool> isBurnt(CrossmintVcNft nft)
```

Returns `true` if the NFT has been burned (owner is the zero address).

### getNftUri

```dart theme={null}
Future<String> getNftUri(CrossmintVcNft nft)
```

Reads `tokenURI(tokenId)` from the ERC-721 contract.

### getContractUri

```dart theme={null}
Future<String?> getContractUri(
  String contractAddress,
  CrossmintVcChain chain,
)
```

Reads `contractURI()` from an ERC-7572 contract.