Address Details
contract
token
0x32A9FE697a32135BFd313a6Ac28792DaE4D9979d
- Token
- cMCO2 (cMCO2)
- Creator
- 0x35c4c1–ca32fd at 0xee81f4–c9c820
- Balance
- 0 CELO ( )
- Locked CELO Balance
- 0.00 CELO
- Voting CELO Balance
- 0.00 CELO
- Pending Unlocked Gold
- 0.00 CELO
- Tokens
-
Fetching tokens...
- Transactions
- 1,603 Transactions
- Transfers
- 3 Transfers
- Gas Used
- 67,128,134
- Last Balance Update
- 25161805
Transactions
Token Transfers
Tokens
Internal Transactions
Coin Balance History
Logs
Code
Read Contract
Write Contract
This contract has been verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- ControlledSideToken
- Optimization enabled
- false
- Compiler version
- v0.5.17+commit.d19bba13
- EVM Version
- istanbul
- Verified at
- 2021-09-04T01:43:33.397172Z
Contract source code
pragma solidity ^0.5.0; import "./zeppelin/token/ERC777/ERC777.sol"; import "./IERC677Receiver.sol"; import "./ISideToken.sol"; contract ControlledSideToken is ISideToken, ERC777 { using Address for address; using SafeMath for uint256; address public authorized; uint256 private _granularity; event Transfer(address,address,uint256,bytes); constructor( string memory _tokenName, string memory _tokenSymbol, address _authorizedAddr, address[] memory _onwerAddr, uint256 _newGranularity ) ERC777(_tokenName, _tokenSymbol, _onwerAddr) public { require(_authorizedAddr != address(0), "SideToken: Minter address is null"); require(_newGranularity >= 1, "SideToken: Granularity must be equal or bigger than 1"); authorized = _authorizedAddr; _granularity = _newGranularity; } modifier onlyAuthorized() { require(_msgSender() == authorized, "SideToken: Caller is not the minter"); _; } function mint( address account, uint256 amount, bytes calldata userData, bytes calldata operatorData ) external onlyAuthorized { _mint(_msgSender(), account, amount, userData, operatorData); } /** * @dev Overrides burn funcionality so only authorized wallets can burn * tokens. This is important because if a holder burns tokens on the * side token that amount would be forever stuck on the original bridge, * therefore the original token total supply would be forever wrong. * It's also imperative that we centralize burns on the main token as * this side token mirrors a real-world asset with an audited inventory. * * That's why only default operators can burn tokens and only the authorized * address can burn its tokens. Regular users and contracts can't. * * Also emits a {Transfer} event for ERC20 compatibility. */ function burn(uint256 amount, bytes calldata data) external onlyAuthorized { _burn(_msgSender(), _msgSender(), amount, data, ""); } /** * @dev ERC677 transfer token with additional data if the recipient is a contact. * @param recipient The address to transfer to. * @param amount The amount to be transferred. * @param data The extra data to be passed to the receiving contract. */ function transferAndCall(address recipient, uint amount, bytes calldata data) external returns (bool success) { address from = _msgSender(); _send(from, from, recipient, amount, data, "", false); emit Transfer(from, recipient, amount, data); IERC677Receiver(recipient).onTokenTransfer(from, amount, data); return true; } function granularity() public view returns (uint256) { return _granularity; } }
IERC677Receiver.sol
pragma solidity ^0.5.0; interface IERC677Receiver { function onTokenTransfer(address _sender, uint _value, bytes calldata _data) external; }
ISideToken.sol
pragma solidity ^0.5.0; interface ISideToken { function name() external view returns (string memory); function symbol() external view returns (string memory); function decimals() external pure returns (uint8); function granularity() external view returns (uint256); function burn(uint256 amount, bytes calldata data) external; function mint(address account, uint256 amount, bytes calldata userData, bytes calldata operatorData) external; function totalSupply() external view returns (uint256); function balanceOf(address owner) external view returns (uint256); function send(address recipient, uint256 amount, bytes calldata data) external; function transfer(address recipient, uint256 amount) external returns (bool); function allowance(address owner, address spender) external view returns (uint256); function approve(address spender, uint256 amount) external returns (bool); function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); }
Context.sol
pragma solidity ^0.5.0; /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns (address payable) { return msg.sender; } function _msgData() internal view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }
IERC1820Registry.sol
pragma solidity ^0.5.0; /** * @dev Interface of the global ERC1820 Registry, as defined in the * https://eips.ethereum.org/EIPS/eip-1820[EIP]. Accounts may register * implementers for interfaces in this registry, as well as query support. * * Implementers may be shared by multiple accounts, and can also implement more * than a single interface for each account. Contracts can implement interfaces * for themselves, but externally-owned accounts (EOA) must delegate this to a * contract. * * {IERC165} interfaces can also be queried via the registry. * * For an in-depth explanation and source code analysis, see the EIP text. */ interface IERC1820Registry { /** * @dev Sets `newManager` as the manager for `account`. A manager of an * account is able to set interface implementers for it. * * By default, each account is its own manager. Passing a value of `0x0` in * `newManager` will reset the manager to this initial state. * * Emits a {ManagerChanged} event. * * Requirements: * * - the caller must be the current manager for `account`. */ function setManager(address account, address newManager) external; /** * @dev Returns the manager for `account`. * * See {setManager}. */ function getManager(address account) external view returns (address); /** * @dev Sets the `implementer` contract as `account`'s implementer for * `interfaceHash`. * * `account` being the zero address is an alias for the caller's address. * The zero address can also be used in `implementer` to remove an old one. * * See {interfaceHash} to learn how these are created. * * Emits an {InterfaceImplementerSet} event. * * Requirements: * * - the caller must be the current manager for `account`. * - `interfaceHash` must not be an {IERC165} interface id (i.e. it must not * end in 28 zeroes). * - `implementer` must implement {IERC1820Implementer} and return true when * queried for support, unless `implementer` is the caller. See * {IERC1820Implementer-canImplementInterfaceForAddress}. */ function setInterfaceImplementer(address account, bytes32 interfaceHash, address implementer) external; /** * @dev Returns the implementer of `interfaceHash` for `account`. If no such * implementer is registered, returns the zero address. * * If `interfaceHash` is an {IERC165} interface id (i.e. it ends with 28 * zeroes), `account` will be queried for support of it. * * `account` being the zero address is an alias for the caller's address. */ function getInterfaceImplementer(address account, bytes32 interfaceHash) external view returns (address); /** * @dev Returns the interface hash for an `interfaceName`, as defined in the * corresponding * https://eips.ethereum.org/EIPS/eip-1820#interface-name[section of the EIP]. */ function interfaceHash(string calldata interfaceName) external pure returns (bytes32); /** * @notice Updates the cache with whether the contract implements an ERC165 interface or not. * @param account Address of the contract for which to update the cache. * @param interfaceId ERC165 interface for which to update the cache. */ function updateERC165Cache(address account, bytes4 interfaceId) external; /** * @notice Checks whether a contract implements an ERC165 interface or not. * If the result is not cached a direct lookup on the contract address is performed. * If the result is not cached or the cached value is out-of-date, the cache MUST be updated manually by calling * {updateERC165Cache} with the contract address. * @param account Address of the contract to check. * @param interfaceId ERC165 interface to check. * @return True if `account` implements `interfaceId`, false otherwise. */ function implementsERC165Interface(address account, bytes4 interfaceId) external view returns (bool); /** * @notice Checks whether a contract implements an ERC165 interface or not without using nor updating the cache. * @param account Address of the contract to check. * @param interfaceId ERC165 interface to check. * @return True if `account` implements `interfaceId`, false otherwise. */ function implementsERC165InterfaceNoCache(address account, bytes4 interfaceId) external view returns (bool); event InterfaceImplementerSet(address indexed account, bytes32 indexed interfaceHash, address indexed implementer); event ManagerChanged(address indexed account, address indexed newManager); }
SafeMath.sol
pragma solidity ^0.5.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. * * _Available since v2.4.0._ */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
IERC20.sol
pragma solidity ^0.5.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see {ERC20Detailed}. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
ERC777.sol
pragma solidity ^0.5.0; import "../../GSN/Context.sol"; import "./IERC777.sol"; import "./IERC777Recipient.sol"; import "./IERC777Sender.sol"; import "../../token/ERC20/IERC20.sol"; import "../../math/SafeMath.sol"; import "../../utils/Address.sol"; import "../../introspection/IERC1820Registry.sol"; /** * @dev Implementation of the {IERC777} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * * Support for ERC20 is included in this contract, as specified by the EIP: both * the ERC777 and ERC20 interfaces can be safely used when interacting with it. * Both {IERC777-Sent} and {IERC20-Transfer} events are emitted on token * movements. * * Additionally, the {IERC777-granularity} value is hard-coded to `1`, meaning that there * are no special restrictions in the amount of tokens that created, moved, or * destroyed. This makes integration with ERC20 applications seamless. */ contract ERC777 is Context, IERC777, IERC20 { using SafeMath for uint256; using Address for address; IERC1820Registry constant private _erc1820 = IERC1820Registry(0x8a0994B2b1b8aB22B8DE7000DD31931FD61771a9); mapping(address => uint256) private _balances; uint256 private _totalSupply; string private _name; string private _symbol; // We inline the result of the following hashes because Solidity doesn't resolve them at compile time. // See https://github.com/ethereum/solidity/issues/4024. // keccak256("ERC777TokensSender") bytes32 constant private TOKENS_SENDER_INTERFACE_HASH = 0x29ddb589b1fb5fc7cf394961c1adf5f8c6454761adf795e67fe149f658abe895; // keccak256("ERC777TokensRecipient") bytes32 constant private TOKENS_RECIPIENT_INTERFACE_HASH = 0xb281fc8c12954d22544db45de3159a39272895b169a852b314f9cc762e44c53b; // This isn't ever read from - it's only used to respond to the defaultOperators query. address[] private _defaultOperatorsArray; // Immutable, but accounts may revoke them (tracked in __revokedDefaultOperators). mapping(address => bool) private _defaultOperators; // For each account, a mapping of its operators and revoked default operators. mapping(address => mapping(address => bool)) private _operators; mapping(address => mapping(address => bool)) private _revokedDefaultOperators; // ERC20-allowances mapping (address => mapping (address => uint256)) private _allowances; /** * @dev `defaultOperators` may be an empty array. */ constructor( string memory name, string memory symbol, address[] memory defaultOperators ) public { _name = name; _symbol = symbol; _defaultOperatorsArray = defaultOperators; for (uint256 i = 0; i < _defaultOperatorsArray.length; i++) { _defaultOperators[_defaultOperatorsArray[i]] = true; } // register interfaces _erc1820.setInterfaceImplementer(address(this), keccak256("ERC777Token"), address(this)); _erc1820.setInterfaceImplementer(address(this), keccak256("ERC20Token"), address(this)); } /** * @dev See {IERC777-name}. */ function name() public view returns (string memory) { return _name; } /** * @dev See {IERC777-symbol}. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev See {ERC20Detailed-decimals}. * * Always returns 18, as per the * [ERC777 EIP](https://eips.ethereum.org/EIPS/eip-777#backward-compatibility). */ function decimals() public pure returns (uint8) { return 18; } /** * @dev See {IERC777-granularity}. * * This implementation always returns `1`. */ function granularity() public view returns (uint256) { return 1; } /** * @dev See {IERC777-totalSupply}. */ function totalSupply() public view returns (uint256) { return _totalSupply; } /** * @dev Returns the amount of tokens owned by an account (`tokenHolder`). */ function balanceOf(address tokenHolder) public view returns (uint256) { return _balances[tokenHolder]; } /** * @dev See {IERC777-send}. * * Also emits a {Transfer} event for ERC20 compatibility. */ function send(address recipient, uint256 amount, bytes calldata data) external { _send(_msgSender(), _msgSender(), recipient, amount, data, "", true); } /** * @dev See {IERC20-transfer}. * * Unlike `send`, `recipient` is _not_ required to implement the {IERC777Recipient} * interface if it is a contract. * * Also emits a {Sent} event. */ function transfer(address recipient, uint256 amount) external returns (bool) { require(recipient != address(0), "ERC777: transfer to zero address"); address from = _msgSender(); _callTokensToSend(from, from, recipient, amount, "", ""); _move(from, from, recipient, amount, "", ""); _callTokensReceived(from, from, recipient, amount, "", "", false); return true; } /** * @dev See {IERC777-burn}. * * Also emits a {Transfer} event for ERC20 compatibility. */ function burn(uint256 amount, bytes calldata data) external { _burn(_msgSender(), _msgSender(), amount, data, ""); } /** * @dev See {IERC777-isOperatorFor}. */ function isOperatorFor( address operator, address tokenHolder ) public view returns (bool) { return operator == tokenHolder || (_defaultOperators[operator] && !_revokedDefaultOperators[tokenHolder][operator]) || _operators[tokenHolder][operator]; } /** * @dev See {IERC777-authorizeOperator}. */ function authorizeOperator(address operator) external { require(_msgSender() != operator, "ERC777: authorizing self as operator"); if (_defaultOperators[operator]) { delete _revokedDefaultOperators[_msgSender()][operator]; } else { _operators[_msgSender()][operator] = true; } emit AuthorizedOperator(operator, _msgSender()); } /** * @dev See {IERC777-revokeOperator}. */ function revokeOperator(address operator) external { require(operator != _msgSender(), "ERC777: revoking self as operator"); if (_defaultOperators[operator]) { _revokedDefaultOperators[_msgSender()][operator] = true; } else { delete _operators[_msgSender()][operator]; } emit RevokedOperator(operator, _msgSender()); } /** * @dev See {IERC777-defaultOperators}. */ function defaultOperators() public view returns (address[] memory) { return _defaultOperatorsArray; } /** * @dev See {IERC777-operatorSend}. * * Emits {Sent} and {Transfer} events. */ function operatorSend( address sender, address recipient, uint256 amount, bytes calldata data, bytes calldata operatorData ) external { require(isOperatorFor(_msgSender(), sender), "ERC777: caller is not an operator"); _send(_msgSender(), sender, recipient, amount, data, operatorData, true); } /** * @dev See {IERC777-operatorBurn}. * * Emits {Burned} and {Transfer} events. */ function operatorBurn(address account, uint256 amount, bytes calldata data, bytes calldata operatorData) external { require(isOperatorFor(_msgSender(), account), "ERC777: caller is not an operator"); _burn(_msgSender(), account, amount, data, operatorData); } /** * @dev See {IERC20-allowance}. * * Note that operator and allowance concepts are orthogonal: operators may * not have allowance, and accounts with allowance may not be operators * themselves. */ function allowance(address holder, address spender) public view returns (uint256) { return _allowances[holder][spender]; } /** * @dev See {IERC20-approve}. * * Note that accounts cannot have allowance issued by their operators. */ function approve(address spender, uint256 value) external returns (bool) { address holder = _msgSender(); _approve(holder, spender, value); return true; } /** * @dev See {IERC20-transferFrom}. * * Note that operator and allowance concepts are orthogonal: operators cannot * call `transferFrom` (unless they have allowance), and accounts with * allowance cannot call `operatorSend` (unless they are operators). * * Emits {Sent}, {Transfer} and {Approval} events. */ function transferFrom(address holder, address recipient, uint256 amount) external returns (bool) { require(recipient != address(0), "ERC777: transfer to zero address"); require(holder != address(0), "ERC777: transfer from zero address"); address spender = _msgSender(); _callTokensToSend(spender, holder, recipient, amount, "", ""); _move(spender, holder, recipient, amount, "", ""); _approve(holder, spender, _allowances[holder][spender].sub(amount, "ERC777: transfer amount exceeds allowance")); _callTokensReceived(spender, holder, recipient, amount, "", "", false); return true; } /** * @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * If a send hook is registered for `account`, the corresponding function * will be called with `operator`, `data` and `operatorData`. * * See {IERC777Sender} and {IERC777Recipient}. * * Emits {Minted} and {Transfer} events. * * Requirements * * - `account` cannot be the zero address. * - if `account` is a contract, it must implement the {IERC777Recipient} * interface. */ function _mint( address operator, address account, uint256 amount, bytes memory userData, bytes memory operatorData ) internal { require(account != address(0), "ERC777: mint to zero address"); // Update state variables _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); _callTokensReceived(operator, address(0), account, amount, userData, operatorData, true); emit Minted(operator, account, amount, userData, operatorData); emit Transfer(address(0), account, amount); } /** * @dev Send tokens * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) * @param requireReceptionAck if true, contract recipients are required to implement ERC777TokensRecipient */ function _send( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData, bool requireReceptionAck ) internal { require(from != address(0), "ERC777: send from zero address"); require(to != address(0), "ERC777: send to zero address"); _callTokensToSend(operator, from, to, amount, userData, operatorData); _move(operator, from, to, amount, userData, operatorData); _callTokensReceived(operator, from, to, amount, userData, operatorData, requireReceptionAck); } /** * @dev Burn tokens * @param operator address operator requesting the operation * @param from address token holder address * @param amount uint256 amount of tokens to burn * @param data bytes extra information provided by the token holder * @param operatorData bytes extra information provided by the operator (if any) */ function _burn( address operator, address from, uint256 amount, bytes memory data, bytes memory operatorData ) internal { require(from != address(0), "ERC777: burn from zero address"); _callTokensToSend(operator, from, address(0), amount, data, operatorData); // Update state variables _balances[from] = _balances[from].sub(amount, "ERC777: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Burned(operator, from, amount, data, operatorData); emit Transfer(from, address(0), amount); } function _move( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData ) internal { _balances[from] = _balances[from].sub(amount, "ERC777: transfer amount exceeds balance"); _balances[to] = _balances[to].add(amount); emit Sent(operator, from, to, amount, userData, operatorData); emit Transfer(from, to, amount); } function _approve(address holder, address spender, uint256 value) internal { // TODO: restore this require statement if this function becomes internal, or is called at a new callsite. It is // currently unnecessary. //require(holder != address(0), "ERC777: approve from the zero address"); require(spender != address(0), "ERC777: approve to zero address"); _allowances[holder][spender] = value; emit Approval(holder, spender, value); } /** * @dev Call from.tokensToSend() if the interface is registered * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) */ function _callTokensToSend( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData ) internal { address implementer = _erc1820.getInterfaceImplementer(from, TOKENS_SENDER_INTERFACE_HASH); if (implementer != address(0)) { IERC777Sender(implementer).tokensToSend(operator, from, to, amount, userData, operatorData); } } /** * @dev Call to.tokensReceived() if the interface is registered. Reverts if the recipient is a contract but * tokensReceived() was not registered for the recipient * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) * @param requireReceptionAck if true, contract recipients are required to implement ERC777TokensRecipient */ function _callTokensReceived( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData, bool requireReceptionAck ) private { address implementer = _erc1820.getInterfaceImplementer(to, TOKENS_RECIPIENT_INTERFACE_HASH); if (implementer != address(0)) { IERC777Recipient(implementer).tokensReceived(operator, from, to, amount, userData, operatorData); } else if (requireReceptionAck) { require(!to.isContract(), "ERC777: token recipient contract has no implementer for ERC777TokensRecipient"); } } }
IERC777.sol
pragma solidity ^0.5.0; /** * @dev Interface of the ERC777Token standard as defined in the EIP. * * This contract uses the * [ERC1820 registry standard](https://eips.ethereum.org/EIPS/eip-1820) to let * token holders and recipients react to token movements by using setting implementers * for the associated interfaces in said registry. See `IERC1820Registry` and * `ERC1820Implementer`. */ interface IERC777 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() external view returns (string memory); /** * @dev Returns the smallest part of the token that is not divisible. This * means all token operations (creation, movement and destruction) must have * amounts that are a multiple of this number. * * For most token contracts, this value will equal 1. */ function granularity() external view returns (uint256); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by an account (`owner`). */ function balanceOf(address owner) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * If send or receive hooks are registered for the caller and `recipient`, * the corresponding functions will be called with `data` and empty * `operatorData`. See `IERC777Sender` and `IERC777Recipient`. * * Emits a `Sent` event. * * Requirements * * - the caller must have at least `amount` tokens. * - `recipient` cannot be the zero address. * - if `recipient` is a contract, it must implement the `tokensReceived` * interface. */ function send(address recipient, uint256 amount, bytes calldata data) external; /** * @dev Destroys `amount` tokens from the caller's account, reducing the * total supply. * * If a send hook is registered for the caller, the corresponding function * will be called with `data` and empty `operatorData`. See `IERC777Sender`. * * Emits a `Burned` event. * * Requirements * * - the caller must have at least `amount` tokens. */ function burn(uint256 amount, bytes calldata data) external; /** * @dev Returns true if an account is an operator of `tokenHolder`. * Operators can send and burn tokens on behalf of their owners. All * accounts are their own operator. * * See `operatorSend` and `operatorBurn`. */ function isOperatorFor(address operator, address tokenHolder) external view returns (bool); /** * @dev Make an account an operator of the caller. * * See `isOperatorFor`. * * Emits an `AuthorizedOperator` event. * * Requirements * * - `operator` cannot be calling address. */ function authorizeOperator(address operator) external; /** * @dev Make an account an operator of the caller. * * See `isOperatorFor` and `defaultOperators`. * * Emits a `RevokedOperator` event. * * Requirements * * - `operator` cannot be calling address. */ function revokeOperator(address operator) external; /** * @dev Returns the list of default operators. These accounts are operators * for all token holders, even if `authorizeOperator` was never called on * them. * * This list is immutable, but individual holders may revoke these via * `revokeOperator`, in which case `isOperatorFor` will return false. */ function defaultOperators() external view returns (address[] memory); /** * @dev Moves `amount` tokens from `sender` to `recipient`. The caller must * be an operator of `sender`. * * If send or receive hooks are registered for `sender` and `recipient`, * the corresponding functions will be called with `data` and * `operatorData`. See `IERC777Sender` and `IERC777Recipient`. * * Emits a `Sent` event. * * Requirements * * - `sender` cannot be the zero address. * - `sender` must have at least `amount` tokens. * - the caller must be an operator for `sender`. * - `recipient` cannot be the zero address. * - if `recipient` is a contract, it must implement the `tokensReceived` * interface. */ function operatorSend( address sender, address recipient, uint256 amount, bytes calldata data, bytes calldata operatorData ) external; /** * @dev Destoys `amount` tokens from `account`, reducing the total supply. * The caller must be an operator of `account`. * * If a send hook is registered for `account`, the corresponding function * will be called with `data` and `operatorData`. See `IERC777Sender`. * * Emits a `Burned` event. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. * - the caller must be an operator for `account`. */ function operatorBurn( address account, 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); }
IERC777Recipient.sol
pragma solidity ^0.5.0; /** * @dev Interface of the ERC777TokensRecipient standard as defined in the EIP. * * Accounts can be notified of `IERC777` tokens being sent to them by having a * contract implement this interface (contract holders can be their own * implementer) and registering it on the * [ERC1820 global registry](https://eips.ethereum.org/EIPS/eip-1820). * * See `IERC1820Registry` and `ERC1820Implementer`. */ interface IERC777Recipient { /** * @dev Called by an `IERC777` token contract whenever tokens are being * moved or created into a registered account (`to`). The type of operation * is conveyed by `from` being the zero address or not. * * This call occurs _after_ the token contract's state is updated, so * `IERC777.balanceOf`, etc., can be used to query the post-operation state. * * This function may revert to prevent the operation from being executed. */ function tokensReceived( address operator, address from, address to, uint amount, bytes calldata userData, bytes calldata operatorData ) external; }
IERC777Sender.sol
pragma solidity ^0.5.0; /** * @dev Interface of the ERC777TokensSender standard as defined in the EIP. * * `IERC777` Token holders can be notified of operations performed on their * tokens by having a contract implement this interface (contract holders can be * their own implementer) and registering it on the * [ERC1820 global registry](https://eips.ethereum.org/EIPS/eip-1820). * * See `IERC1820Registry` and `ERC1820Implementer`. */ interface IERC777Sender { /** * @dev Called by an `IERC777` token contract whenever a registered holder's * (`from`) tokens are about to be moved or destroyed. The type of operation * is conveyed by `to` being the zero address or not. * * This call occurs _before_ the token contract's state is updated, so * `IERC777.balanceOf`, etc., can be used to query the pre-operation state. * * This function may revert to prevent the operation from being executed. */ function tokensToSend( address operator, address from, address to, uint amount, bytes calldata userData, bytes calldata operatorData ) external; }
Address.sol
pragma solidity ^0.5.0; /** * @dev Collection of functions related to the address type, */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } }
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"string","name":"_tokenName","internalType":"string"},{"type":"string","name":"_tokenSymbol","internalType":"string"},{"type":"address","name":"_authorizedAddr","internalType":"address"},{"type":"address[]","name":"_onwerAddr","internalType":"address[]"},{"type":"uint256","name":"_newGranularity","internalType":"uint256"}]},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":true},{"type":"address","name":"spender","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"AuthorizedOperator","inputs":[{"type":"address","name":"operator","internalType":"address","indexed":true},{"type":"address","name":"tokenHolder","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Burned","inputs":[{"type":"address","name":"operator","internalType":"address","indexed":true},{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false},{"type":"bytes","name":"data","internalType":"bytes","indexed":false},{"type":"bytes","name":"operatorData","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"Minted","inputs":[{"type":"address","name":"operator","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false},{"type":"bytes","name":"data","internalType":"bytes","indexed":false},{"type":"bytes","name":"operatorData","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"RevokedOperator","inputs":[{"type":"address","name":"operator","internalType":"address","indexed":true},{"type":"address","name":"tokenHolder","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Sent","inputs":[{"type":"address","name":"operator","internalType":"address","indexed":true},{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false},{"type":"bytes","name":"data","internalType":"bytes","indexed":false},{"type":"bytes","name":"operatorData","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"","internalType":"address","indexed":false},{"type":"address","name":"","internalType":"address","indexed":false},{"type":"uint256","name":"","internalType":"uint256","indexed":false},{"type":"bytes","name":"","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"allowance","inputs":[{"type":"address","name":"holder","internalType":"address"},{"type":"address","name":"spender","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"approve","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"authorizeOperator","inputs":[{"type":"address","name":"operator","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"authorized","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"tokenHolder","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"burn","inputs":[{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"pure","payable":false,"outputs":[{"type":"uint8","name":"","internalType":"uint8"}],"name":"decimals","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address[]","name":"","internalType":"address[]"}],"name":"defaultOperators","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"granularity","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isOperatorFor","inputs":[{"type":"address","name":"operator","internalType":"address"},{"type":"address","name":"tokenHolder","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"mint","inputs":[{"type":"address","name":"account","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes","name":"userData","internalType":"bytes"},{"type":"bytes","name":"operatorData","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"name","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"operatorBurn","inputs":[{"type":"address","name":"account","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"},{"type":"bytes","name":"operatorData","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"operatorSend","inputs":[{"type":"address","name":"sender","internalType":"address"},{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"},{"type":"bytes","name":"operatorData","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"revokeOperator","inputs":[{"type":"address","name":"operator","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"send","inputs":[{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"symbol","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalSupply","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transfer","inputs":[{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"success","internalType":"bool"}],"name":"transferAndCall","inputs":[{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transferFrom","inputs":[{"type":"address","name":"holder","internalType":"address"},{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false}]
Contract Creation Code
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