security-erc20-token.sol

pragma solidity ^0.8.7;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract SecurityHashrateToken is ERC20 {
    address private owner;
    mapping (address => bool) private authorized;

    constructor(uint256 initialSupply) ERC20("SECURITYHASHRATE", "SHRTK") {
        owner = msg.sender;
        _mint(msg.sender, initialSupply);
    }

    function addAuthorizedAddress(address _authorizedAddress) public onlyOwner {
        authorized[_authorizedAddress] = true;
    }

    function removeAuthorizedAddress(address _authorizedAddress) public onlyOwner {
        authorized[_authorizedAddress] = false;
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        require(authorized[recipient] == true, "Address should be authorized to receive tokens");

        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    modifier onlyOwner {
      require(msg.sender == owner);
      _;
    }
}