# Credentialed

[Git Source](https://github.com/EntreDevelopers-Lab-Inc/Mezz-Companies/blob/f7a3e84e3dd5bb33c4bd7f77283983f9e8ba20b2/src/core/base/Credentialed.sol)

**Inherits:** ERC165Upgradeable, ICredentialed

**Author:** Daniel Yamagata & Naveen Ailawadi

A base contract that requires implementers to define a core identifier and version

*Contracts must be credentialed to be set in the Mezz Migrator*

## Functions

### coreId

Returns the coreId of the implementation as a bytes32

*The core ID is the keccak256 hash of the contract name followed by a version under the following syntax: "mezzanine.coreId.ContractName.vX" For example, the core ID of the 2nd version of the Treasury would be the following: keccak256(abi.encodePacked("mezzanine.coreId.Treasury.v2"))*

```solidity
function coreId() public pure virtual returns (bytes32);
```

### version

Returns the version of the implementation as a uint256

```solidity
function version() public pure virtual returns (uint256);
```

### supportsInterface

*ERC165 support*

```solidity
function supportsInterface(bytes4 interfaceId)
    public
    view
    virtual
    override(ERC165Upgradeable, IERC165)
    returns (bool);
```


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