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

# GPv2Authentication API

> Authentication contracts API for managing solver authorization in Gnosis Protocol v2

# GPv2Authentication API

Authentication contracts for managing solver authorization in Gnosis Protocol v2. Only trusted solvers can execute trades.

## GPv2Authentication Interface

Base interface with a single function:

```solidity theme={null}
interface GPv2Authentication {
    function isSolver(address) external view returns (bool);
}
```

## GPv2AllowListAuthentication Contract

The primary implementation featuring manager-based access control.

### State Variables

```solidity theme={null}
address public manager;
mapping(address => bool) private solvers;
```

### Events

```solidity theme={null}
event ManagerChanged(address newManager);
event SolverAdded(address solver);
event SolverRemoved(address solver);
```

### Functions

#### initializeManager

One-time initialization compatible with proxy deployment pattern.

```solidity theme={null}
function initializeManager(address manager_) external initializer;
```

#### setManager

Reassigns the manager role. Callable by manager or proxy owner.

```solidity theme={null}
function setManager(address manager_) external onlyManagerOrOwner;
```

#### addSolver

Adds a solver to the authorized allowlist.

```solidity theme={null}
function addSolver(address solver) external onlyManager;
```

#### removeSolver

Removes a solver from the authorized allowlist.

```solidity theme={null}
function removeSolver(address solver) external onlyManager;
```

#### isSolver

Checks if an address is an authorized solver.

```solidity theme={null}
function isSolver(address solver) external view returns (bool);
```

## Access Control

| Modifier             | Description                          |
| -------------------- | ------------------------------------ |
| `onlyManager`        | Restricts to current manager address |
| `onlyManagerOrOwner` | Allows manager or proxy admin        |

## Security Recommendations

* Assign the manager role to a multi-sig wallet or DAO
* Monitor for unauthorized changes via events
* Implement time-locks for critical operations