pragma solidity ^0.6.0; import "@openzeppelin/contracts/access/AccessControl.sol"; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; contract MyToken is ERC20, AccessControl { bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE"); bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE"); constructor() public ERC20("MyToken", "TKN") { // Grant the contract deployer the default admin role: it will be able // to grant and revoke any roles _setupRole(DEFAULT_ADMIN_ROLE, msg.sender); } function mint(address to, uint256 amount) public { require(hasRole(MINTER_ROLE, msg.sender), "Caller is not a minter"); _mint(to, amount); } function burn(address from, uint256 amount) public { require(hasRole(BURNER_ROLE, msg.sender), "Caller is not a burner"); _burn(from, amount); } } 0.5.0