# Integration with Solana

### **TurnkeySigner for Solana Transactions**

TurnkeySigner extends `ISolanaSigner` with a **Turnkey-specific address**, ensuring that transaction signing is **linked securely** to Turnkey's infrastructure.

```typescript
export type TurnkeySigner = ISolanaSigner & {
    turnkeyAddress: string;
};
```

* The `turnkeyAddress` uniquely identifies a signer as a **Turnkey-managed wallet**.

**Wallet Recognition (solana-provider.ts)**

The Solana provider checks if a connected wallet is a **TurnkeySigner** via `isExternalSolanaSigner()`:

```typescript
isExternalSolanaSigner(): boolean {
    return !(this.solanaWallet as TurnkeySigner).turnkeyAddress;
}
```

* If `turnkeyAddress` is **missing**, the wallet is treated as **an external signer** (not managed by Turnkey).

### **Transaction Signing with TurnkeySigner**

* The provider retrieves the signer using `getSigner()`.
* If the signer is **Turnkey-integrated**, the signing process is secured by **Dynamic’s passkey-based authentication** and **AWS Nitro Enclaves** before executing `signTransaction` or `signAllTransactions`.


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