## `rememberKey`

### Signature

```solidity
function rememberKey(uint256 privateKey) external returns (address keyAddr);
```

### Description

Stores a private key in forge's local wallet and returns the corresponding address. The address can then be used for [broadcasting](/reference/cheatcodes/broadcast).

### Parameters

| Parameter    | Type      | Description                  |
|--------------|-----------|------------------------------|
| `privateKey` | `uint256` | The private key to store     |

### Returns

| Type      | Description                          |
|-----------|--------------------------------------|
| `address` | The address corresponding to the key |

### Examples

Derive and remember a key from a mnemonic:

```solidity [script/Deploy.s.sol]
string memory mnemonic = "test test test test test test test test test test test junk";
uint256 privateKey = vm.deriveKey(mnemonic, 0);
address deployer = vm.rememberKey(privateKey);

vm.startBroadcast(deployer);
// ... deploy contracts
vm.stopBroadcast();
```

Load a private key from an environment variable:

```solidity [script/Deploy.s.sol]
address deployer = vm.rememberKey(vm.envUint("PRIVATE_KEY"));

vm.startBroadcast(deployer);
// ... deploy contracts
vm.stopBroadcast();
```

### Related Cheatcodes

* [`deriveKey`](/reference/cheatcodes/derive-key) - Derives a private key from a mnemonic
* [`broadcast`](/reference/cheatcodes/broadcast) - Sets the next call's msg.sender
* [`startBroadcast`](/reference/cheatcodes/start-broadcast) - Starts broadcasting transactions

### See Also

* [`deriveRememberKey`](/reference/forge-std/derive-remember-key)