ERC-777.sol

pragma solidity ^0.5.7;

interface ERC777 {
  function name() external view returns (string memory);
  function symbol() external view returns (string memory);
  function totalSupply() external view returns (uint256);
  function granularity() external view returns (uint256);

  function balanceOf(address owner) external view returns (uint256);
  function send(address to, uint256 amount, bytes calldata data) external;
  
  function defaultOperators() external view returns (address[] memory);
  function isOperatorFor(address operator, address tokenHolder) external view returns (bool);
  function authorizeOperator(address operator) external;
  function revokeOperator(address operator) external;
  function operatorSend(
    address from,
    address to,
    uint256 amount,
    bytes calldata data,
    bytes calldata operatorData
  ) external;

  function burn(uint256 amount, bytes calldata data) external;
  function operatorBurn(address from, uint256 amount, bytes calldata data, bytes calldata operatorData) external;

  event Sent(
    address indexed operator,
    address indexed from,
    address indexed to,
    uint256 amount,
    bytes data,
    bytes operatorData
  );
  event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData);
  event Burned(address indexed operator, address indexed from, uint256 amount, bytes data, bytes operatorData);
  event AuthorizedOperator(address indexed operator, address indexed tokenHolder);
  event RevokedOperator(address indexed operator, address indexed tokenHolder);
}