# Registry

> *Address:* [*0xFA8beC73cebB9D88FF88a2f75E7D7312f2Fd39EC*](https://polygonscan.com/address/0xFA8beC73cebB9D88FF88a2f75E7D7312f2Fd39EC)

The primary contract and system entry point is `DIMORegistry`. This contract has all of the storage and is in charge of adding, deleting, and updating modules. It also directs calls and transactions to the appropriate module, which houses the implementation logic, using delegate calls. Nevertheless, no module has`constructor`, and the only contract that does so is `DIMORegistry`.

The only contract that cannot be upgraded is DIMORegistry, which helps to increase security and fend against harmful attempts. Only addresses with the admin role can access the functions that alter modules.

```solidity
struct Storage {
    // Maps function selectors to the implementations that execute the functions
    mapping(bytes4 => address) implementations;

    // Maps the implementation to the hash of all its selectors
    // implementation => keccak256(abi.encode(selectors))
    mapping(address => bytes32) selectorsHash; 
}
```