erc173i

// https://eips.ethereum.org/EIPS/eip-173
// https://github.com/0xcert/ethereum-erc721/blob/master/src/contracts/ownership/ownable.sol (this example)
// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol
// https://github.com/FriendlyUser/solidity-smart-contracts//blob/v0.2.0/contracts/other/CredVert/Ownable.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0 <0.8.0;

/// @title ERC-173 Contract Ownership Standard
/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-173.md
///  Note: the ERC-165 identifier for this interface is 0x7f5828d0
interface ERC173 /* is ERC165 */ {
    /// @dev This emits when ownership of a contract changes
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /// @notice Get the address of the owner
    /// @return The address of the owner.
    function owner() external view returns (address);
    /// @notice Set the address of the new owner of the contract
    /// @dev Set _newOwner to address(0) to renounce any ownership.
    /// @param _newOwner The address of the new owner of the contract
    function transferOwnership(address _newOwner) external;
}

interface ERC165 {
    /// @notice Query if a contract implements an interface
    /// @param interfaceID The interface identifier, as specified in ERC-165
    /// @dev Interface identification is specified in ERC-165. This function
    ///  uses less than 30,000 gas.
    /// @return `true` if the contract implements `interfaceID` and
    ///  `interfaceID` is not 0xffffffff, `false` otherwise
    function supportsInterface(bytes4 interfaceID) external view returns (bool);
}