Token

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library SafeMath    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function add(uint256 a, uint256 b)    - function mod(uint256 a, uint256 b)  contract ERC1820Registry    - function setInterfaceImplementer(addr ...    - function getInterfaceImplementer(addr ...    - function setManager(address _addr, ad ...    - function getManager(address _addr)  contract ERC1820Client    - function setInterfaceImplementation(s ...    - function interfaceAddr(address addr, ...    - function delegateManagement(address _ ... interface ERC20Token    - function name()    - function symbol()    - function decimals()    - function totalSupply()    - function balanceOf(address owner)    - function transfer(address to, uint256 ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...    - function allowance(address owner, add ... interface ERC777Token    - function name()    - function symbol()    - function totalSupply()    - function balanceOf(address owner)    - function granularity()    - function defaultOperators()    - function isOperatorFor(address operat ...    - function authorizeOperator(address op ...    - function revokeOperator(address opera ...    - function send(address to, uint256 amo ...    - function operatorSend(    - function burn(uint256 amount, bytes c ...    - function operatorBurn(address from, u ... interface ERC777TokensSender    - function tokensToSend( interface ERC777TokensRecipient    - function tokensReceived(  contract ERC777BaseToken is ERC777 ...    - function name()    - function symbol()    - function granularity()    - function totalSupply()    - function balanceOf(address _tokenHold ...    - function defaultOperators()    - function send(address _to, uint256 _a ...    - function authorizeOperator(address _o ...    - function revokeOperator(address _oper ...    - function isOperatorFor(address _opera ...    - function operatorSend(    - function burn(uint256 _amount, bytes ...    - function operatorBurn(    - function requireMultiple(uint256 _amo ...    - function isRegularAddress(address _ad ...    - function doSend(    - function doBurn(    - function callRecipient(    - function callSender(  contract ERC777ERC20BaseToken is E ...    - function decimals()    - function transfer(address _to, uint25 ...    - function transferFrom(address _from, ...    - function approve(address _spender, ui ...    - function _approve(address owner, addr ...    - function increaseAllowance(address sp ...    - function decreaseAllowance(address sp ...    - function allowance(address _owner, ad ...    - function doSend(    - function doBurn(  contract Ownable    - function owner()    - function isOwner()    - function renounceOwnership()    - function transferOwnership(address ne ...    - function _transferOwnership(address n ...  contract DATACHAIN is ERC777ERC20B ... *    - function dDefaultOperators()    - function _mint(address to, uint256 va ...    - function mint(address to, uint256 val ...

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/**
 *Submitted for verification at Etherscan.io on 2019-04-24
*/

pragma solidity 0.5.7;

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error.
 */
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on 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-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

contract ERC1820Registry {
    function setInterfaceImplementer(address _addr, bytes32 _interfaceHash, address _implementer) external;
    function getInterfaceImplementer(address _addr, bytes32 _interfaceHash) external view returns (address);
    function setManager(address _addr, address _newManager) external;
    function getManager(address _addr) public view returns (address);
}


/// Base client to interact with the registry.
contract ERC1820Client {
    ERC1820Registry constant ERC1820REGISTRY = ERC1820Registry(0x1820a4B7618BdE71Dce8cdc73aAB6C95905faD24);

    function setInterfaceImplementation(string memory _interfaceLabel, address _implementation) internal {
        bytes32 interfaceHash = keccak256(abi.encodePacked(_interfaceLabel));
        ERC1820REGISTRY.setInterfaceImplementer(address(this), interfaceHash, _implementation);
    }

    function interfaceAddr(address addr, string memory _interfaceLabel) internal view returns(address) {
        bytes32 interfaceHash = keccak256(abi.encodePacked(_interfaceLabel));
        return ERC1820REGISTRY.getInterfaceImplementer(addr, interfaceHash);
    }

    function delegateManagement(address _newManager) internal {
        ERC1820REGISTRY.setManager(address(this), _newManager);
    }
}

interface ERC20Token {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function transfer(address to, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function approve(address spender, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);

    // solhint-disable-next-line no-simple-event-func-name
    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Approval(address indexed owner, address indexed spender, uint256 amount);
}

interface ERC777Token {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function totalSupply() external view returns (uint256);
    function balanceOf(address owner) external view returns (uint256);
    function granularity() external view returns (uint256);

    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 send(address to, uint256 amount, bytes calldata data) 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);
}

interface ERC777TokensSender {
    function tokensToSend(
        address operator,
        address from,
        address to,
        uint amount,
        bytes calldata data,
        bytes calldata operatorData
    ) external;
}

interface ERC777TokensRecipient {
    function tokensReceived(
        address operator,
        address from,
        address to,
        uint256 amount,
        bytes calldata data,
        bytes calldata operatorData
    ) external;
}

contract ERC777BaseToken is ERC777Token, ERC1820Client {
    using SafeMath for uint256;

    string internal mName;
    string internal mSymbol;
    uint256 internal mGranularity;
    uint256 internal mTotalSupply;


    mapping(address => uint) internal mBalances;

    address[] internal mDefaultOperators;
    mapping(address => bool) internal mIsDefaultOperator;
    mapping(address => mapping(address => bool)) internal mRevokedDefaultOperator;
    mapping(address => mapping(address => bool)) internal mAuthorizedOperators;

    /* -- Constructor -- */
    //
    /// @notice Constructor to create a ReferenceToken
    /// @param _name Name of the new token
    /// @param _symbol Symbol of the new token.
    /// @param _granularity Minimum transferable chunk.
    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _granularity,
        address[] memory _defaultOperators
    ) internal {
        mName = _name;
        mSymbol = _symbol;
        mTotalSupply = 0;
        require(_granularity >= 1, "Granularity must be > 1");
        mGranularity = _granularity;

        mDefaultOperators = _defaultOperators;
        for (uint256 i = 0; i < mDefaultOperators.length; i++) { mIsDefaultOperator[mDefaultOperators[i]] = true; }

        setInterfaceImplementation("ERC777Token", address(this));
    }

    /* -- ERC777 Interface Implementation -- */
    //
    /// @return the name of the token
    function name() public view returns (string memory) { return mName; }

    /// @return the symbol of the token
    function symbol() public view returns (string memory) { return mSymbol; }

    /// @return the granularity of the token
    function granularity() public view returns (uint256) { return mGranularity; }

    /// @return the total supply of the token
    function totalSupply() public view returns (uint256) { return mTotalSupply; }

    /// @notice Return the account balance of some account
    /// @param _tokenHolder Address for which the balance is returned
    /// @return the balance of `_tokenAddress`.
    function balanceOf(address _tokenHolder) public view returns (uint256) { return mBalances[_tokenHolder]; }

    /// @notice Return the list of default operators
    /// @return the list of all the default operators
    function defaultOperators() public view returns (address[] memory) { return mDefaultOperators; }

    /// @notice Send `_amount` of tokens to address `_to` passing `_data` to the recipient
    /// @param _to The address of the recipient
    /// @param _amount The number of tokens to be sent
    function send(address _to, uint256 _amount, bytes calldata _data) external {
        doSend(msg.sender, msg.sender, _to, _amount, _data, "", true);
    }

    /// @notice Authorize a third party `_operator` to manage (send) `msg.sender`'s tokens.
    /// @param _operator The operator that wants to be Authorized
    function authorizeOperator(address _operator) external {
        require(_operator != msg.sender, "Cannot authorize yourself as an operator");
        if (mIsDefaultOperator[_operator]) {
            mRevokedDefaultOperator[_operator][msg.sender] = false;
        } else {
            mAuthorizedOperators[_operator][msg.sender] = true;
        }
        emit AuthorizedOperator(_operator, msg.sender);
    }

    /// @notice Revoke a third party `_operator`'s rights to manage (send) `msg.sender`'s tokens.
    /// @param _operator The operator that wants to be Revoked
    function revokeOperator(address _operator) external {
        require(_operator != msg.sender, "Cannot revoke yourself as an operator");
        if (mIsDefaultOperator[_operator]) {
            mRevokedDefaultOperator[_operator][msg.sender] = true;
        } else {
            mAuthorizedOperators[_operator][msg.sender] = false;
        }
        emit RevokedOperator(_operator, msg.sender);
    }

    /// @notice Check whether the `_operator` address is allowed to manage the tokens held by `_tokenHolder` address.
    /// @param _operator address to check if it has the right to manage the tokens
    /// @param _tokenHolder address which holds the tokens to be managed
    /// @return `true` if `_operator` is authorized for `_tokenHolder`
    function isOperatorFor(address _operator, address _tokenHolder) public view returns (bool) {
        return (_operator == _tokenHolder // solium-disable-line operator-whitespace
            || mAuthorizedOperators[_operator][_tokenHolder]
            || (mIsDefaultOperator[_operator] && !mRevokedDefaultOperator[_operator][_tokenHolder]));
    }

    /// @notice Send `_amount` of tokens on behalf of the address `from` to the address `to`.
    /// @param _from The address holding the tokens being sent
    /// @param _to The address of the recipient
    /// @param _amount The number of tokens to be sent
    /// @param _data Data generated by the user to be sent to the recipient
    /// @param _operatorData Data generated by the operator to be sent to the recipient
    function operatorSend(
        address _from,
        address _to,
        uint256 _amount,
        bytes calldata _data,
        bytes calldata _operatorData
    )
        external
    {
        require(isOperatorFor(msg.sender, _from), "Not an operator");
        doSend(msg.sender, _from, _to, _amount, _data, _operatorData, true);
    }

    function burn(uint256 _amount, bytes calldata _data) external {
        doBurn(msg.sender, msg.sender, _amount, _data, "");
    }

    function operatorBurn(
        address _tokenHolder,
        uint256 _amount,
        bytes calldata _data,
        bytes calldata _operatorData
    )
        external
    {
        require(isOperatorFor(msg.sender, _tokenHolder), "Not an operator");
        doBurn(msg.sender, _tokenHolder, _amount, _data, _operatorData);
    }

    /* -- Helper Functions -- */
    //
    /// @notice Internal function that ensures `_amount` is multiple of the granularity
    /// @param _amount The quantity that want's to be checked
    function requireMultiple(uint256 _amount) internal view {
        require(_amount % mGranularity == 0, "Amount is not a multiple of granualrity");
    }

    /// @notice Check whether an address is a regular address or not.
    /// @param _addr Address of the contract that has to be checked
    /// @return `true` if `_addr` is a regular address (not a contract)
    function isRegularAddress(address _addr) internal view returns(bool) {
        if (_addr == address(0)) { return false; }
        uint size;
        assembly { size := extcodesize(_addr) } // solium-disable-line security/no-inline-assembly
        return size == 0;
    }

    /// @notice Helper function actually performing the sending of tokens.
    /// @param _operator The address performing the send
    /// @param _from The address holding the tokens being sent
    /// @param _to The address of the recipient
    /// @param _amount The number of tokens to be sent
    /// @param _data Data generated by the user to be passed to the recipient
    /// @param _operatorData Data generated by the operator to be passed to the recipient
    /// @param _preventLocking `true` if you want this function to throw when tokens are sent to a contract not
    ///  implementing `ERC777tokensRecipient`.
    ///  ERC777 native Send functions MUST set this parameter to `true`, and backwards compatible ERC20 transfer
    ///  functions SHOULD set this parameter to `false`.
    function doSend(
        address _operator,
        address _from,
        address _to,
        uint256 _amount,
        bytes memory _data,
        bytes memory _operatorData,
        bool _preventLocking
    )
        internal
    {
        requireMultiple(_amount);

        callSender(_operator, _from, _to, _amount, _data, _operatorData);

        require(_to != address(0), "Cannot send to 0x0");
        require(mBalances[_from] >= _amount, "Not enough funds");

        mBalances[_from] = mBalances[_from].sub(_amount);
        mBalances[_to] = mBalances[_to].add(_amount);

        callRecipient(_operator, _from, _to, _amount, _data, _operatorData, _preventLocking);

        emit Sent(_operator, _from, _to, _amount, _data, _operatorData);
    }

    /// @notice Helper function actually performing the burning of tokens.
    /// @param _operator The address performing the burn
    /// @param _tokenHolder The address holding the tokens being burn
    /// @param _amount The number of tokens to be burnt
    /// @param _data Data generated by the token holder
    /// @param _operatorData Data generated by the operator
    function doBurn(
        address _operator,
        address _tokenHolder,
        uint256 _amount,
        bytes memory _data,
        bytes memory _operatorData
    )
        internal
    {
        callSender(_operator, _tokenHolder, address(0), _amount, _data, _operatorData);

        requireMultiple(_amount);
        require(balanceOf(_tokenHolder) >= _amount, "Not enough funds");

        mBalances[_tokenHolder] = mBalances[_tokenHolder].sub(_amount);
        mTotalSupply = mTotalSupply.sub(_amount);

        emit Burned(_operator, _tokenHolder, _amount, _data, _operatorData);
    }

    /// @notice Helper function that checks for ERC777TokensRecipient on the recipient and calls it.
    ///  May throw according to `_preventLocking`
    /// @param _operator The address performing the send or mint
    /// @param _from The address holding the tokens being sent
    /// @param _to The address of the recipient
    /// @param _amount The number of tokens to be sent
    /// @param _data Data generated by the user to be passed to the recipient
    /// @param _operatorData Data generated by the operator to be passed to the recipient
    /// @param _preventLocking `true` if you want this function to throw when tokens are sent to a contract not
    ///  implementing `ERC777TokensRecipient`.
    ///  ERC777 native Send functions MUST set this parameter to `true`, and backwards compatible ERC20 transfer
    ///  functions SHOULD set this parameter to `false`.
    function callRecipient(
        address _operator,
        address _from,
        address _to,
        uint256 _amount,
        bytes memory _data,
        bytes memory _operatorData,
        bool _preventLocking
    )
        internal
    {
        address recipientImplementation = interfaceAddr(_to, "ERC777TokensRecipient");
        if (recipientImplementation != address(0)) {
            ERC777TokensRecipient(recipientImplementation).tokensReceived(
                _operator, _from, _to, _amount, _data, _operatorData);
        } else if (_preventLocking) {
            require(isRegularAddress(_to), "Cannot send to contract without ERC777TokensRecipient");
        }
    }

    /// @notice Helper function that checks for ERC777TokensSender on the sender and calls it.
    ///  May throw according to `_preventLocking`
    /// @param _from The address holding the tokens being sent
    /// @param _to The address of the recipient
    /// @param _amount The amount of tokens to be sent
    /// @param _data Data generated by the user to be passed to the recipient
    /// @param _operatorData Data generated by the operator to be passed to the recipient
    ///  implementing `ERC777TokensSender`.
    ///  ERC777 native Send functions MUST set this parameter to `true`, and backwards compatible ERC20 transfer
    ///  functions SHOULD set this parameter to `false`.
    function callSender(
        address _operator,
        address _from,
        address _to,
        uint256 _amount,
        bytes memory _data,
        bytes memory _operatorData
    )
        internal
    {
        address senderImplementation = interfaceAddr(_from, "ERC777TokensSender");
        if (senderImplementation == address(0)) { return; }
        ERC777TokensSender(senderImplementation).tokensToSend(
            _operator, _from, _to, _amount, _data, _operatorData);
    }
}

contract ERC777ERC20BaseToken is ERC20Token, ERC777BaseToken {
    bool internal mErc20compatible;

    mapping(address => mapping(address => uint256)) internal mAllowed;

    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _granularity,
        address[] memory _defaultOperators
    )
        internal ERC777BaseToken(_name, _symbol, _granularity, _defaultOperators)
    {
        mErc20compatible = true;
        setInterfaceImplementation("ERC20Token", address(this));
    }

    /// @notice This modifier is applied to erc20 obsolete methods that are
    ///  implemented only to maintain backwards compatibility. When the erc20
    ///  compatibility is disabled, this methods will fail.
    modifier erc20 () {
        require(mErc20compatible, "ERC20 is disabled");
        _;
    }

    /// @notice For Backwards compatibility
    /// @return The decimals of the token. Forced to 18 in ERC777.
    function decimals() public erc20 view returns (uint8) { return uint8(18); }

    /// @notice ERC20 backwards compatible transfer.
    /// @param _to The address of the recipient
    /// @param _amount The number of tokens to be transferred
    /// @return `true`, if the transfer can't be done, it should fail.
    function transfer(address _to, uint256 _amount) public erc20 returns (bool success) {
        doSend(msg.sender, msg.sender, _to, _amount, "", "", false);
        return true;
    }

    /// @notice ERC20 backwards compatible transferFrom.
    /// @param _from The address holding the tokens being transferred
    /// @param _to The address of the recipient
    /// @param _amount The number of tokens to be transferred
    /// @return `true`, if the transfer can't be done, it should fail.
    function transferFrom(address _from, address _to, uint256 _amount) public erc20 returns (bool success) {
        require(_amount <= mAllowed[_from][msg.sender], "Not enough funds allowed");

        // Cannot be after doSend because of tokensReceived re-entry
        mAllowed[_from][msg.sender] = mAllowed[_from][msg.sender].sub(_amount);
        doSend(msg.sender, _from, _to, _amount, "", "", false);
        return true;
    }

    /// @notice ERC20 backwards compatible approve.
    ///  `msg.sender` approves `_spender` to spend `_amount` tokens on its behalf.
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _amount The number of tokens to be approved for transfer
    /// @return `true`, if the approve can't be done, it should fail.
    function approve(address _spender, uint256 _amount) public erc20 returns (bool success) {
        _approve(msg.sender, _spender, _amount);
        return true;
    }

    /**
     * @dev Approve an address to spend another addresses' tokens.
     * @param owner The address that owns the tokens.
     * @param spender The address that will spend the tokens.
     * @param value The number of tokens that can be spent.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        require(spender != address(0));
        require(owner != address(0));

        mAllowed[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    /**
     * @dev Increase the amount of tokens that an owner allowed to a spender.
     * approve should be called when _allowed[msg.sender][spender] == 0. To increment
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param addedValue The amount of tokens to increase the allowance by.
     */
    function increaseAllowance(address spender, uint256 addedValue) public erc20 returns (bool) {
        _approve(msg.sender, spender, mAllowed[msg.sender][spender].add(addedValue));
        return true;
    }

    

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender.
     * approve should be called when _allowed[msg.sender][spender] == 0. To decrement
     * allowed value is better to use this function to avoid 2 calls (and wait until
     * the first transaction is mined)
     * From MonolithDAO Token.sol
     * Emits an Approval event.
     * @param spender The address which will spend the funds.
     * @param subtractedValue The amount of tokens to decrease the allowance by.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public erc20 returns (bool) {
        _approve(msg.sender, spender, mAllowed[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    /// @notice ERC20 backwards compatible allowance.
    ///  This function makes it easy to read the `allowed[]` map
    /// @param _owner The address of the account that owns the token
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens of _owner that _spender is allowed
    ///  to spend
    function allowance(address _owner, address _spender) public erc20 view returns (uint256 remaining) {
        return mAllowed[_owner][_spender];
    }

    function doSend(
        address _operator,
        address _from,
        address _to,
        uint256 _amount,
        bytes memory _data,
        bytes memory _operatorData,
        bool _preventLocking
    )
        internal
    {
        super.doSend(_operator, _from, _to, _amount, _data, _operatorData, _preventLocking);
        if (mErc20compatible) { emit Transfer(_from, _to, _amount); }
    }

    function doBurn(
        address _operator,
        address _tokenHolder,
        uint256 _amount,
        bytes memory _data,
        bytes memory _operatorData
    )
        internal
    {
        super.doBurn(_operator, _tokenHolder, _amount, _data, _operatorData);
        if (mErc20compatible) { emit Transfer(_tokenHolder, address(0), _amount); }
    }
}

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

    /**
     * @return the address of the owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner());
        _;
    }

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     * @notice Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0));
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}


contract DATACHAIN is ERC777ERC20BaseToken, Ownable {
    string internal dName = "DATACHAIN";
    string internal dSymbol = "DC";
    uint256 internal dGranularity = 1;
    uint256 internal dTotalSupply = 1000000000 * (10**18);

    function dDefaultOperators() internal pure returns (address[] memory) {
        address[] memory defaultOps = new address[](1);
        
        defaultOps[0] = 0xa6903375509A5F4f740aEC4Aa677b8C18D41027b;
        
        return defaultOps;
    }

    constructor() public 
        ERC777ERC20BaseToken(
            dName, 
            dSymbol, 
            dGranularity, 
            dDefaultOperators()) 
    {
        _mint(msg.sender, dTotalSupply);
    }

    function _mint(address to, uint256 value) internal returns (bool) {

        require(to != address(0));

        requireMultiple(value);

        mTotalSupply = mTotalSupply.add(value);
        mBalances[to] = mBalances[to].add(value);

        callRecipient(msg.sender, address(0), to, value, "", "", true);


        emit Minted(msg.sender, to, value, "", "");

        emit Transfer(address(0), to, value);

        return true;
    }

    function mint(address to, uint256 value) public onlyOwner returns (bool) {
        _mint(to, value);
        return true;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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