interface IERC1594 {
    // Issuance / Redemption Events
    event Issued(address indexed _operator, address indexed _to, uint256 _value, bytes _data);
    event Redeemed(address indexed _operator, address indexed _from, uint256 _value, bytes _data);

    // Transfers
    function transferWithData(address _to, uint256 _value, bytes calldata _data) external;
    function transferFromWithData(address _from, address _to, uint256 _value, bytes calldata _data) external;

    // Token Redemption
    function redeem(uint256 _value, bytes calldata _data) external;
    function redeemFrom(address _tokenHolder, uint256 _value, bytes calldata _data) external;

    // Token Issuance
    function issue(address _tokenHolder, uint256 _value, bytes calldata _data) external;
    function isIssuable() external view returns (bool);

    // Transfer Validity
    function canTransfer(address _to, uint256 _value, bytes calldata _data) external view returns (bool, byte, bytes32);
    function canTransferFrom(address _from, address _to, uint256 _value, bytes calldata _data) external view returns (bool, byte, bytes32);
}
/// @title IERC1594 Security Token Standard
/// @dev See https://github.com/SecurityTokenStandard/EIP-Spec
function issue(address _tokenHolder, uint256 _value, bytes calldata _data) external;

// Token Issuance