OpenGPU

In the contract `OPENGPU` the role `_owner` has authority over the functions shown in the diagram below.  - `reduceFee()`: This function reduces the `feeMultiplier` used to calculate transaction fees. It can only be executed by the contract owner and cannot reduce the `feeMultiplier` below 1. **Privileged role**: Only the contract owner can call this function. In the contract `Ownable` the role `_owner` has authority over the functions shown in the diagram below.  - `transferOwnership(address newOwner)`: Allows the current owner to transfer control of the contract to a new owner, ensuring the new owner is not the zero address. **Privileged role**: Only the contract owner can call this function. - `renounceOwnership()`: Allows the current owner to renounce their ownership, setting the owner to the zero address and effectively removing any control they have over privileged functions. **Privileged role**: Only the contract owner can call this function. Any compromise to the `_owner` account may allow the hacker to take advantage of this authority and update the sensitive settings and execute sensitive functionalities of the project.