> For the complete documentation index, see [llms.txt](/llms.txt).

# Ed25519 private key

To retrieve the ed25519 private key of the user, use the `getEd25519PrivateKey` method. This private key can be used to sign transactions on Solana, Near, Algorand, and other chains that use the ed25519 curve.

The method returns an empty string if the user isn't authenticated, so you can use it to check for an existing session after [initialize](/embedded-wallets/sdk/flutter/#initialize-web3auth).

## Usage

```dart
final privateKey = await Web3AuthFlutter.getEd25519PrivateKey();

```

note

Web3Auth supports two widely used cryptographic curves, Secp256k1 and Ed25519, making it chain-agnostic and compatible with multiple blockchain networks. [Learn more about how to connect different blockchains](/embedded-wallets/connect-blockchain/).