> ## 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.

# CrossmintEvmNonCustodialSigner

> Flutter Final Class

**Final Class**

EVM variant of `CrossmintNonCustodialSigner`. Signs with secp256k1 keys using hex encoding. Applies the EIP-191 personal-message prefix when signing arbitrary strings.

```dart theme={null}
final class CrossmintEvmNonCustodialSigner extends CrossmintNonCustodialSigner
```

## Constructors

### CrossmintEvmNonCustodialSigner

```dart theme={null}
CrossmintEvmNonCustodialSigner({
  required super.client,
  required super.bridge,
  required super.type,
  required super.locator,
  super.address,
  super.onAuthRequired,
  super.bridgeClient,
})
```

Creates an EVM non-custodial signer.

## Methods

### signMessage

```dart theme={null}
Future<String> signMessage(String message)
```

### signTransaction

```dart theme={null}
Future<String> signTransaction(String transaction)
```