bufrr · June 24, 2019 03:46
diff --git a/ballot.sol b/ballot.sol
 pragma solidity >=0.4.22 <0.6.0;
 contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
        address delegate;
    }
    struct Proposal {
        uint voteCount;
    }

    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    /// Create a new ballot with $(_numProposals) different proposals.
    constructor(uint8 _numProposals) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 1;
        proposals.length = _numProposals;
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function giveRightToVote(address toVoter) public {
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
    }

    /// Delegate your vote to the voter $(to).
    function delegate(address to) public {
        Voter storage sender = voters[msg.sender]; // assigns reference
        if (sender.voted) return;
        while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
            to = voters[to].delegate;
        if (to == msg.sender) return;
        sender.voted = true;
        sender.delegate = to;
        Voter storage delegateTo = voters[to];
        if (delegateTo.voted)
            proposals[delegateTo.vote].voteCount += sender.weight;
        else
            delegateTo.weight += sender.weight;
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public {
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;
        proposals[toProposal].voteCount += sender.weight;
    }

    function winningProposal() public view returns (uint8 _winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
    }
 }
diff --git a/ballot_test.sol b/ballot_test.sol

 import "remix_tests.sol"; // this import is automatically injected by Remix.
 import "./ballot.sol";

 contract test3 {
   
    Ballot ballotToTest;
    function beforeAll () public {
       ballotToTest = new Ballot(2);
    }
    
    function checkWinningProposal () public {
        ballotToTest.vote(1);
        Assert.equal(ballotToTest.winningProposal(), uint(1), "1 should be the winning proposal");
    }
    
    function checkWinninProposalWithReturnValue () public view returns (bool) {
        return ballotToTest.winningProposal() == 1;
    }
 }
diff --git a/creditsystem.sol b/creditsystem.sol
 pragma solidity ^0.4.20;

 //import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/access/roles/SignerRole.sol";

 /**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
 library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev give an account access to this role
     */
    function add(Role storage role, address account) internal {
        require(account != address(0));
        require(!has(role, account));

        role.bearer[account] = true;
    }

    /**
     * @dev remove an account's access to this role
     */
    function remove(Role storage role, address account) internal {
        require(account != address(0));
        require(has(role, account));

        role.bearer[account] = false;
    }

    /**
     * @dev check if an account has this role
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0));
        return role.bearer[account];
    }
 }

 contract SignerRole {
    using Roles for Roles.Role;

    event SignerAdded(address indexed account);
    event SignerRemoved(address indexed account);

    Roles.Role private _signers;

    function SignerRole() internal {
        _addSigner(msg.sender);
    }

    modifier onlySigner() {
        require(isSigner(msg.sender));
        _;
    }

    function isSigner(address account) public view returns (bool) {
        return _signers.has(account);
    }

    function addSigner(address account) public onlySigner {
        _addSigner(account);
    }

    function renounceSigner() public {
        _removeSigner(msg.sender);
    }

    function _addSigner(address account) internal {
        _signers.add(account);
        SignerAdded(account);
    }

    function _removeSigner(address account) internal {
        _signers.remove(account);
        SignerRemoved(account);
    }
 }


 contract Committee {
    /// @notice Whether the msg.sender is committee or not.
    /// @return Whether the transfer was successful or not
    function IsOndutyCommittee(address _user) public view returns(bool);
 }

 contract CreditSystem is SignerRole{
 // contract CreditSystem is SignerRole{
    event NewUserRegister(address indexed addr, bytes32 indexed hash);
    event NewIdentity(address indexed addr, bytes32 indexed hash);
    uint public unConfirmedSubAddressLen  = 0;

    mapping (address => UseID) IDs;
    mapping (bytes32 => UseData) DataSet;
    bytes32[] public unregister;

    /// @notice Committee contract address
    address public CommitteeAddr = address("UmixYUgBHA9vJj47myQKn8uZAm4anNCcQBB");

    struct Hash {
        bytes32 hash;
        uint8 status;
    }

    struct UseID {
        //address addr;             // msg.sender
        address useId;              // msg.sender
        string publicKey;           // user's publicKey
        Hash baseHash;              // keccak(idtype + idnum) and verified flag
        HashList hl;                // other certificate's hash and verifiy flag list implements by struct
    }

    struct UseData {
        bytes identity;             // certificate's data
        bytes issuer;               // certificate's issuer
        uint8 status;                // same flag with HashList verifies
        uint index;                 // index in the unregistered array
        string publicKey;           // user's publicKey
    }

    struct HashList {
        bytes32[] hashes;           // keccak(idtype + idnum)
        uint8[] status;            // certificate's status
    }

    struct subAddr {
        bool confirmed;
        string pubKey;
        string encryptedAS;
    }

    mapping (address => subAddr) public SubAddr;

    address[] public UnConfirmedSubAddress;

    /// @notice only committee can do
    modifier onlyCommittee(address _user) {
        require (Committee(CommitteeAddr).IsOndutyCommittee(_user) == true);
        _;
    }

    function test(address _user) public view returns(bool){
        return Committee(CommitteeAddr).IsOndutyCommittee(_user) == true;
    }

    function register(string memory _publicKey,
                    //address _useId,
                    bytes32 _hashKey,
                    bytes memory _identity,
                    bytes memory _issuer)
        public
        payable
        returns(bool){
        address addr = msg.sender;
        require(IDs[addr].useId == address(0) || DataSet[_hashKey].status == 4); // unregistered or rejected
        uint index = unregister.push(_hashKey) - 1;
        UseData memory ud = UseData(_identity, _issuer, 1, index, _publicKey);
        DataSet[_hashKey] = ud;
        UseID memory user = UseID(addr, _publicKey, Hash(_hashKey, 1), HashList(new bytes32[](0), new uint8[](0)));
        IDs[addr] = user;
        IDs[addr].hl.hashes.push(_hashKey);
        IDs[addr].hl.status.push(1);
        NewUserRegister(addr, _hashKey);
        return true;
    }

     // @notice modifier
    modifier subAddrNotAdded(address _addr) {
        require(!SubAddr[_addr].confirmed);
        _;
    }

   function subRegister(string _pubkey, string _encryptedAS)
        subAddrNotAdded(msg.sender)
        public
        payable
        returns (bool)
    {
        SubAddr[msg.sender].confirmed = false;
        SubAddr[msg.sender].pubKey = _pubkey;
        SubAddr[msg.sender].encryptedAS = _encryptedAS;
        for (uint i= 0; i < unConfirmedSubAddressLen; i++) {
                if (UnConfirmedSubAddress[i] == msg.sender) {
                  return false;
                }
            }
        UnConfirmedSubAddress.push(msg.sender);
        unConfirmedSubAddressLen = UnConfirmedSubAddress.length;
        return true;
    }

    // @dev check that subAddr confirmed
    function checkSubAddr(address _addr) public view returns (bool) {
        return SubAddr[_addr].confirmed;
    }

    function getUnConfirmedSubAddressLen()
        public
        view
        returns(uint){
        return UnConfirmedSubAddress.length;
    }

    function verifySub(address addr)
        public
        // onlyCommittee(msg.sender)
        returns(bool){
           SubAddr[addr].confirmed = true;
           for (uint i= 0; i < unConfirmedSubAddressLen; i++) {
                if (UnConfirmedSubAddress[i] == addr) {
                    UnConfirmedSubAddress[i] = UnConfirmedSubAddress[unConfirmedSubAddressLen - 1];
                    UnConfirmedSubAddress.length -= 1;
                    unConfirmedSubAddressLen = UnConfirmedSubAddress.length;
                }
            }
        return true;
    }

    function getUserInfo(address addr)
        public
        view
        returns(address, string memory, bytes32, bytes32[] memory, uint8[] memory){
        return (IDs[addr].useId,
        IDs[addr].publicKey,
        IDs[addr].baseHash.hash,
        IDs[addr].hl.hashes,
        IDs[addr].hl.status);
    }

    function getAccountStatus(address _user) public view returns (uint8){
        return DataSet[IDs[_user].baseHash.hash].status;
    }

    function addNewIdentity(bytes32 hashKey, bytes memory _identity, bytes memory _issuer)
        public
        payable
        returns(bool){
        require(IDs[msg.sender].useId != address(0)); // registered user
        uint index = unregister.push(hashKey) - 1;
        UseData memory ud = UseData(_identity, _issuer, 1, index, IDs[msg.sender].publicKey);
        DataSet[hashKey] = ud;
        IDs[msg.sender].hl.hashes.push(hashKey);
        IDs[msg.sender].hl.status.push(1);
        NewIdentity(msg.sender, hashKey);
        return true;
    }

    function getBaseData(address addr)
        public
        view
        returns(bytes32, uint8){
            Hash memory h = IDs[addr].baseHash;
            return (h.hash, h.status);
        }

    function getHashData(bytes32 hash)
        public
        view
        returns(bytes memory, bytes memory, uint8, string memory){
            UseData memory ud = DataSet[hash];
            return (ud.identity, ud.issuer, ud.status, ud.publicKey);
    }

    function getUnregisterHash()
        public
        view
        returns(bytes32[] memory){
        return unregister;
    }

    function getUnregisterLen()
        public
        view
        returns(uint){
        return unregister.length;
    }

    function verifyHash(address addr, bytes32 hash)
        public
        // onlySigner
        //onlyCommittee(msg.sender)
        returns(bool){
            require(IDs[addr].useId != address(0));
            require(DataSet[hash].status == 1);
            DataSet[hash].status = 3;
            for(uint i=0; i<IDs[addr].hl.hashes.length; i++){
                if(hash == IDs[addr].hl.hashes[i]){
                    IDs[addr].hl.status[i] = 3;
                    unregister[DataSet[hash].index] = unregister[unregister.length - 1];        // move the last element to the index
                    DataSet[unregister[unregister.length - 1]].index = DataSet[hash].index;     // update former last emement's index
                    unregister.length--;
                    return true;
                }
            }
        return false;
    }

    function rejectHash(address addr, bytes32 hash)
        public
        // onlySigner
        //onlyCommittee(msg.sender)
        returns(bool){
            require(IDs[addr].useId != address(0));
            require(DataSet[hash].status == 1);
            DataSet[hash].status = 4;
            for(uint i=0; i<IDs[addr].hl.hashes.length; i++){
                if(hash == IDs[addr].hl.hashes[i]){
                    IDs[addr].hl.status[i] = 4;
                    unregister[DataSet[hash].index] = unregister[unregister.length - 1];        // move the last element to the index
                    DataSet[unregister[unregister.length - 1]].index = DataSet[hash].index;     // update former last emement's index
                    unregister.length--;
                    return true;
                }
            }
        return false;
    }
 }
diff --git a/token.sol b/token.sol
 pragma solidity ^0.5.0;

 library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
 }

 contract MinterRole {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    constructor () internal {
        _addMinter(msg.sender);
    }

    modifier onlyMinter() {
        require(isMinter(msg.sender), "MinterRole: caller does not have the Minter role");
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(msg.sender);
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }
 }

 contract PauserRole {
    using Roles for Roles.Role;

    event PauserAdded(address indexed account);
    event PauserRemoved(address indexed account);

    Roles.Role private _pausers;

    constructor () internal {
        _addPauser(msg.sender);
    }

    modifier onlyPauser() {
        require(isPauser(msg.sender), "PauserRole: caller does not have the Pauser role");
        _;
    }

    function isPauser(address account) public view returns (bool) {
        return _pausers.has(account);
    }

    function addPauser(address account) public onlyPauser {
        _addPauser(account);
    }

    function renouncePauser() public {
        _removePauser(msg.sender);
    }

    function _addPauser(address account) internal {
        _pausers.add(account);
        emit PauserAdded(account);
    }

    function _removePauser(address account) internal {
        _pausers.remove(account);
        emit PauserRemoved(account);
    }
 }


 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.
     *
     * > 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);
 }

 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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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-solidity/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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
 }

 /**
 * @dev Implementation of the `IERC20` 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`.
 * For a generic mechanism see `ERC20Mintable`.
 *
 * *For a detailed writeup see our guide [How to implement supply
 * mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an `Approval` event is emitted on calls to `transferFrom`.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See `IERC20.approve`.
 */
 contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See `IERC20.totalSupply`.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See `IERC20.balanceOf`.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See `IERC20.transfer`.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(msg.sender, recipient, amount);
        return true;
    }

    /**
     * @dev See `IERC20.allowance`.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See `IERC20.approve`.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev See `IERC20.transferFrom`.
     *
     * Emits an `Approval` event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of `ERC20`;
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `value`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to `approve` that can be used as a mitigation for
     * problems described in `IERC20.approve`.
     *
     * Emits an `Approval` event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to `transfer`, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a `Transfer` event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount);
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a `Transfer` event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

     /**
     * @dev Destoys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a `Transfer` event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _totalSupply = _totalSupply.sub(value);
        _balances[account] = _balances[account].sub(value);
        emit Transfer(account, address(0), value);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an `Approval` event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

    /**
     * @dev Destoys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See `_burn` and `_approve`.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
    }
 }



 /**
 * @dev Extension of `ERC20` that adds a set of accounts with the `MinterRole`,
 * which have permission to mint (create) new tokens as they see fit.
 *
 * At construction, the deployer of the contract is the only minter.
 */
 contract ERC20Mintable is ERC20, MinterRole {
    /**
     * @dev See `ERC20._mint`.
     *
     * Requirements:
     *
     * - the caller must have the `MinterRole`.
     */
    function mint(address account, uint256 amount) public onlyMinter returns (bool) {
        _mint(account, amount);
        return true;
    }
 }


 contract ERC20Capped is ERC20Mintable {
    uint256 private _cap;

    /**
     * @dev Sets the value of the `cap`. This value is immutable, it can only be
     * set once during construction.
     */
    constructor (uint256 cap) public {
        require(cap > 0, "ERC20Capped: cap is 0");
        _cap = cap;
    }

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() public view returns (uint256) {
        return _cap;
    }

    /**
     * @dev See `ERC20Mintable.mint`.
     *
     * Requirements:
     *
     * - `value` must not cause the total supply to go over the cap.
     */
    function _mint(address account, uint256 value) internal {
        require(totalSupply().add(value) <= _cap, "ERC20Capped: cap exceeded");
        super._mint(account, value);
    }
 }

 contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
     * these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei.
     *
     * > Note that this information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * `IERC20.balanceOf` and `IERC20.transfer`.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
 }

 contract Pausable is PauserRole {
    /**
     * @dev Emitted when the pause is triggered by a pauser (`account`).
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by a pauser (`account`).
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state. Assigns the Pauser role
     * to the deployer.
     */
    constructor () internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Called by a pauser to pause, triggers stopped state.
     */
    function pause() public onlyPauser whenNotPaused {
        _paused = true;
        emit Paused(msg.sender);
    }

    /**
     * @dev Called by a pauser to unpause, returns to normal state.
     */
    function unpause() public onlyPauser whenPaused {
        _paused = false;
        emit Unpaused(msg.sender);
    }
 }

 contract ERC20Pausable is ERC20, Pausable {
    function transfer(address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transfer(to, value);
    }

    function transferFrom(address from, address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transferFrom(from, to, value);
    }

    function approve(address spender, uint256 value) public whenNotPaused returns (bool) {
        return super.approve(spender, value);
    }

    function increaseAllowance(address spender, uint addedValue) public whenNotPaused returns (bool) {
        return super.increaseAllowance(spender, addedValue);
    }

    function decreaseAllowance(address spender, uint subtractedValue) public whenNotPaused returns (bool) {
        return super.decreaseAllowance(spender, subtractedValue);
    }
 }

 contract USECNYToken is ERC20, ERC20Detailed, ERC20Capped, ERC20Pausable {

    constructor(
    )
        ERC20Detailed('USECNY', 'UCNY', 18)
        ERC20Capped(1*(10**10)*(10**18))
        ERC20()
        ERC20Pausable()
        public
        payable
    {}

 }
diff --git a/Untitled.sol b/Untitled.sol
 // this line is added to create a gist. Empty file is not allowed.
	pragma solidity >=0.4.22 <0.6.0;
	contract Ballot {

	struct Voter {
	uint weight;
	bool voted;
	uint8 vote;
	address delegate;
	}
	struct Proposal {
	uint voteCount;
	}

	address chairperson;
	mapping(address => Voter) voters;
	Proposal[] proposals;

	/// Create a new ballot with $(_numProposals) different proposals.
	constructor(uint8 _numProposals) public {
	chairperson = msg.sender;
	voters[chairperson].weight = 1;
	proposals.length = _numProposals;
	}

	/// Give $(toVoter) the right to vote on this ballot.
	/// May only be called by $(chairperson).
	function giveRightToVote(address toVoter) public {
	if (msg.sender != chairperson \|\| voters[toVoter].voted) return;
	voters[toVoter].weight = 1;
	}

	/// Delegate your vote to the voter $(to).
	function delegate(address to) public {
	Voter storage sender = voters[msg.sender]; // assigns reference
	if (sender.voted) return;
	while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
	to = voters[to].delegate;
	if (to == msg.sender) return;
	sender.voted = true;
	sender.delegate = to;
	Voter storage delegateTo = voters[to];
	if (delegateTo.voted)
	proposals[delegateTo.vote].voteCount += sender.weight;
	else
	delegateTo.weight += sender.weight;
	}

	/// Give a single vote to proposal $(toProposal).
	function vote(uint8 toProposal) public {
	Voter storage sender = voters[msg.sender];
	if (sender.voted \|\| toProposal >= proposals.length) return;
	sender.voted = true;
	sender.vote = toProposal;
	proposals[toProposal].voteCount += sender.weight;
	}

	function winningProposal() public view returns (uint8 _winningProposal) {
	uint256 winningVoteCount = 0;
	for (uint8 prop = 0; prop < proposals.length; prop++)
	if (proposals[prop].voteCount > winningVoteCount) {
	winningVoteCount = proposals[prop].voteCount;
	_winningProposal = prop;
	}
	}
	}

	import "remix_tests.sol"; // this import is automatically injected by Remix.
	import "./ballot.sol";

	contract test3 {

	Ballot ballotToTest;
	function beforeAll () public {
	ballotToTest = new Ballot(2);
	}

	function checkWinningProposal () public {
	ballotToTest.vote(1);
	Assert.equal(ballotToTest.winningProposal(), uint(1), "1 should be the winning proposal");
	}

	function checkWinninProposalWithReturnValue () public view returns (bool) {
	return ballotToTest.winningProposal() == 1;
	}
	}
	pragma solidity ^0.4.20;

	//import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/access/roles/SignerRole.sol";

	/**
	* @title Roles
	* @dev Library for managing addresses assigned to a Role.
	*/
	library Roles {
	struct Role {
	mapping (address => bool) bearer;
	}

	/**
	* @dev give an account access to this role
	*/
	function add(Role storage role, address account) internal {
	require(account != address(0));
	require(!has(role, account));

	role.bearer[account] = true;
	}

	/**
	* @dev remove an account's access to this role
	*/
	function remove(Role storage role, address account) internal {
	require(account != address(0));
	require(has(role, account));

	role.bearer[account] = false;
	}

	/**
	* @dev check if an account has this role
	* @return bool
	*/
	function has(Role storage role, address account) internal view returns (bool) {
	require(account != address(0));
	return role.bearer[account];
	}
	}

	contract SignerRole {
	using Roles for Roles.Role;

	event SignerAdded(address indexed account);
	event SignerRemoved(address indexed account);

	Roles.Role private _signers;

	function SignerRole() internal {
	_addSigner(msg.sender);
	}

	modifier onlySigner() {
	require(isSigner(msg.sender));
	_;
	}

	function isSigner(address account) public view returns (bool) {
	return _signers.has(account);
	}

	function addSigner(address account) public onlySigner {
	_addSigner(account);
	}

	function renounceSigner() public {
	_removeSigner(msg.sender);
	}

	function _addSigner(address account) internal {
	_signers.add(account);
	SignerAdded(account);
	}

	function _removeSigner(address account) internal {
	_signers.remove(account);
	SignerRemoved(account);
	}
	}


	contract Committee {
	/// @notice Whether the msg.sender is committee or not.
	/// @return Whether the transfer was successful or not
	function IsOndutyCommittee(address _user) public view returns(bool);
	}

	contract CreditSystem is SignerRole{
	// contract CreditSystem is SignerRole{
	event NewUserRegister(address indexed addr, bytes32 indexed hash);
	event NewIdentity(address indexed addr, bytes32 indexed hash);
	uint public unConfirmedSubAddressLen = 0;

	mapping (address => UseID) IDs;
	mapping (bytes32 => UseData) DataSet;
	bytes32[] public unregister;

	/// @notice Committee contract address
	address public CommitteeAddr = address("UmixYUgBHA9vJj47myQKn8uZAm4anNCcQBB");

	struct Hash {
	bytes32 hash;
	uint8 status;
	}

	struct UseID {
	//address addr; // msg.sender
	address useId; // msg.sender
	string publicKey; // user's publicKey
	Hash baseHash; // keccak(idtype + idnum) and verified flag
	HashList hl; // other certificate's hash and verifiy flag list implements by struct
	}

	struct UseData {
	bytes identity; // certificate's data
	bytes issuer; // certificate's issuer
	uint8 status; // same flag with HashList verifies
	uint index; // index in the unregistered array
	string publicKey; // user's publicKey
	}

	struct HashList {
	bytes32[] hashes; // keccak(idtype + idnum)
	uint8[] status; // certificate's status
	}

	struct subAddr {
	bool confirmed;
	string pubKey;
	string encryptedAS;
	}

	mapping (address => subAddr) public SubAddr;

	address[] public UnConfirmedSubAddress;

	/// @notice only committee can do
	modifier onlyCommittee(address _user) {
	require (Committee(CommitteeAddr).IsOndutyCommittee(_user) == true);
	_;
	}

	function test(address _user) public view returns(bool){
	return Committee(CommitteeAddr).IsOndutyCommittee(_user) == true;
	}

	function register(string memory _publicKey,
	//address _useId,
	bytes32 _hashKey,
	bytes memory _identity,
	bytes memory _issuer)
	public
	payable
	returns(bool){
	address addr = msg.sender;
	require(IDs[addr].useId == address(0) \|\| DataSet[_hashKey].status == 4); // unregistered or rejected
	uint index = unregister.push(_hashKey) - 1;
	UseData memory ud = UseData(_identity, _issuer, 1, index, _publicKey);
	DataSet[_hashKey] = ud;
	UseID memory user = UseID(addr, _publicKey, Hash(_hashKey, 1), HashList(new bytes32[](0), new uint8[](0)));
	IDs[addr] = user;
	IDs[addr].hl.hashes.push(_hashKey);
	IDs[addr].hl.status.push(1);
	NewUserRegister(addr, _hashKey);
	return true;
	}

	// @notice modifier
	modifier subAddrNotAdded(address _addr) {
	require(!SubAddr[_addr].confirmed);
	_;
	}

	function subRegister(string _pubkey, string _encryptedAS)
	subAddrNotAdded(msg.sender)
	public
	payable
	returns (bool)
	{
	SubAddr[msg.sender].confirmed = false;
	SubAddr[msg.sender].pubKey = _pubkey;
	SubAddr[msg.sender].encryptedAS = _encryptedAS;
	for (uint i= 0; i < unConfirmedSubAddressLen; i++) {
	if (UnConfirmedSubAddress[i] == msg.sender) {
	return false;
	}
	}
	UnConfirmedSubAddress.push(msg.sender);
	unConfirmedSubAddressLen = UnConfirmedSubAddress.length;
	return true;
	}

	// @dev check that subAddr confirmed
	function checkSubAddr(address _addr) public view returns (bool) {
	return SubAddr[_addr].confirmed;
	}

	function getUnConfirmedSubAddressLen()
	public
	view
	returns(uint){
	return UnConfirmedSubAddress.length;
	}

	function verifySub(address addr)
	public
	// onlyCommittee(msg.sender)
	returns(bool){
	SubAddr[addr].confirmed = true;
	for (uint i= 0; i < unConfirmedSubAddressLen; i++) {
	if (UnConfirmedSubAddress[i] == addr) {
	UnConfirmedSubAddress[i] = UnConfirmedSubAddress[unConfirmedSubAddressLen - 1];
	UnConfirmedSubAddress.length -= 1;
	unConfirmedSubAddressLen = UnConfirmedSubAddress.length;
	}
	}
	return true;
	}

	function getUserInfo(address addr)
	public
	view
	returns(address, string memory, bytes32, bytes32[] memory, uint8[] memory){
	return (IDs[addr].useId,
	IDs[addr].publicKey,
	IDs[addr].baseHash.hash,
	IDs[addr].hl.hashes,
	IDs[addr].hl.status);
	}

	function getAccountStatus(address _user) public view returns (uint8){
	return DataSet[IDs[_user].baseHash.hash].status;
	}

	function addNewIdentity(bytes32 hashKey, bytes memory _identity, bytes memory _issuer)
	public
	payable
	returns(bool){
	require(IDs[msg.sender].useId != address(0)); // registered user
	uint index = unregister.push(hashKey) - 1;
	UseData memory ud = UseData(_identity, _issuer, 1, index, IDs[msg.sender].publicKey);
	DataSet[hashKey] = ud;
	IDs[msg.sender].hl.hashes.push(hashKey);
	IDs[msg.sender].hl.status.push(1);
	NewIdentity(msg.sender, hashKey);
	return true;
	}

	function getBaseData(address addr)
	public
	view
	returns(bytes32, uint8){
	Hash memory h = IDs[addr].baseHash;
	return (h.hash, h.status);
	}

	function getHashData(bytes32 hash)
	public
	view
	returns(bytes memory, bytes memory, uint8, string memory){
	UseData memory ud = DataSet[hash];
	return (ud.identity, ud.issuer, ud.status, ud.publicKey);
	}

	function getUnregisterHash()
	public
	view
	returns(bytes32[] memory){
	return unregister;
	}

	function getUnregisterLen()
	public
	view
	returns(uint){
	return unregister.length;
	}

	function verifyHash(address addr, bytes32 hash)
	public
	// onlySigner
	//onlyCommittee(msg.sender)
	returns(bool){
	require(IDs[addr].useId != address(0));
	require(DataSet[hash].status == 1);
	DataSet[hash].status = 3;
	for(uint i=0; i<IDs[addr].hl.hashes.length; i++){
	if(hash == IDs[addr].hl.hashes[i]){
	IDs[addr].hl.status[i] = 3;
	unregister[DataSet[hash].index] = unregister[unregister.length - 1]; // move the last element to the index
	DataSet[unregister[unregister.length - 1]].index = DataSet[hash].index; // update former last emement's index
	unregister.length--;
	return true;
	}
	}
	return false;
	}

	function rejectHash(address addr, bytes32 hash)
	public
	// onlySigner
	//onlyCommittee(msg.sender)
	returns(bool){
	require(IDs[addr].useId != address(0));
	require(DataSet[hash].status == 1);
	DataSet[hash].status = 4;
	for(uint i=0; i<IDs[addr].hl.hashes.length; i++){
	if(hash == IDs[addr].hl.hashes[i]){
	IDs[addr].hl.status[i] = 4;
	unregister[DataSet[hash].index] = unregister[unregister.length - 1]; // move the last element to the index
	DataSet[unregister[unregister.length - 1]].index = DataSet[hash].index; // update former last emement's index
	unregister.length--;
	return true;
	}
	}
	return false;
	}
	}
	pragma solidity ^0.5.0;

	library Roles {
	struct Role {
	mapping (address => bool) bearer;
	}

	/**
	* @dev Give an account access to this role.
	*/
	function add(Role storage role, address account) internal {
	require(!has(role, account), "Roles: account already has role");
	role.bearer[account] = true;
	}

	/**
	* @dev Remove an account's access to this role.
	*/
	function remove(Role storage role, address account) internal {
	require(has(role, account), "Roles: account does not have role");
	role.bearer[account] = false;
	}

	/**
	* @dev Check if an account has this role.
	* @return bool
	*/
	function has(Role storage role, address account) internal view returns (bool) {
	require(account != address(0), "Roles: account is the zero address");
	return role.bearer[account];
	}
	}

	contract MinterRole {
	using Roles for Roles.Role;

	event MinterAdded(address indexed account);
	event MinterRemoved(address indexed account);

	Roles.Role private _minters;

	constructor () internal {
	_addMinter(msg.sender);
	}

	modifier onlyMinter() {
	require(isMinter(msg.sender), "MinterRole: caller does not have the Minter role");
	_;
	}

	function isMinter(address account) public view returns (bool) {
	return _minters.has(account);
	}

	function addMinter(address account) public onlyMinter {
	_addMinter(account);
	}

	function renounceMinter() public {
	_removeMinter(msg.sender);
	}

	function _addMinter(address account) internal {
	_minters.add(account);
	emit MinterAdded(account);
	}

	function _removeMinter(address account) internal {
	_minters.remove(account);
	emit MinterRemoved(account);
	}
	}

	contract PauserRole {
	using Roles for Roles.Role;

	event PauserAdded(address indexed account);
	event PauserRemoved(address indexed account);

	Roles.Role private _pausers;

	constructor () internal {
	_addPauser(msg.sender);
	}

	modifier onlyPauser() {
	require(isPauser(msg.sender), "PauserRole: caller does not have the Pauser role");
	_;
	}

	function isPauser(address account) public view returns (bool) {
	return _pausers.has(account);
	}

	function addPauser(address account) public onlyPauser {
	_addPauser(account);
	}

	function renouncePauser() public {
	_removePauser(msg.sender);
	}

	function _addPauser(address account) internal {
	_pausers.add(account);
	emit PauserAdded(account);
	}

	function _removePauser(address account) internal {
	_pausers.remove(account);
	emit PauserRemoved(account);
	}
	}


	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.
	*
	* > 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);
	}

	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) {
	require(b <= a, "SafeMath: subtraction overflow");
	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-solidity/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) {
	// Solidity only automatically asserts when dividing by 0
	require(b > 0, "SafeMath: division by zero");
	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) {
	require(b != 0, "SafeMath: modulo by zero");
	return a % b;
	}
	}

	/**
	* @dev Implementation of the `IERC20` 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`.
	* For a generic mechanism see `ERC20Mintable`.
	*
	* *For a detailed writeup see our guide [How to implement supply
	* mechanisms](https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226).*
	*
	* We have followed general OpenZeppelin guidelines: functions revert instead
	* of returning `false` on failure. This behavior is nonetheless conventional
	* and does not conflict with the expectations of ERC20 applications.
	*
	* Additionally, an `Approval` event is emitted on calls to `transferFrom`.
	* This allows applications to reconstruct the allowance for all accounts just
	* by listening to said events. Other implementations of the EIP may not emit
	* these events, as it isn't required by the specification.
	*
	* Finally, the non-standard `decreaseAllowance` and `increaseAllowance`
	* functions have been added to mitigate the well-known issues around setting
	* allowances. See `IERC20.approve`.
	*/
	contract ERC20 is IERC20 {
	using SafeMath for uint256;

	mapping (address => uint256) private _balances;

	mapping (address => mapping (address => uint256)) private _allowances;

	uint256 private _totalSupply;

	/**
	* @dev See `IERC20.totalSupply`.
	*/
	function totalSupply() public view returns (uint256) {
	return _totalSupply;
	}

	/**
	* @dev See `IERC20.balanceOf`.
	*/
	function balanceOf(address account) public view returns (uint256) {
	return _balances[account];
	}

	/**
	* @dev See `IERC20.transfer`.
	*
	* Requirements:
	*
	* - `recipient` cannot be the zero address.
	* - the caller must have a balance of at least `amount`.
	*/
	function transfer(address recipient, uint256 amount) public returns (bool) {
	_transfer(msg.sender, recipient, amount);
	return true;
	}

	/**
	* @dev See `IERC20.allowance`.
	*/
	function allowance(address owner, address spender) public view returns (uint256) {
	return _allowances[owner][spender];
	}

	/**
	* @dev See `IERC20.approve`.
	*
	* Requirements:
	*
	* - `spender` cannot be the zero address.
	*/
	function approve(address spender, uint256 value) public returns (bool) {
	_approve(msg.sender, spender, value);
	return true;
	}

	/**
	* @dev See `IERC20.transferFrom`.
	*
	* Emits an `Approval` event indicating the updated allowance. This is not
	* required by the EIP. See the note at the beginning of `ERC20`;
	*
	* Requirements:
	* - `sender` and `recipient` cannot be the zero address.
	* - `sender` must have a balance of at least `value`.
	* - the caller must have allowance for `sender`'s tokens of at least
	* `amount`.
	*/
	function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
	_transfer(sender, recipient, amount);
	_approve(sender, msg.sender, _allowances[sender][msg.sender].sub(amount));
	return true;
	}

	/**
	* @dev Atomically increases the allowance granted to `spender` by the caller.
	*
	* This is an alternative to `approve` that can be used as a mitigation for
	* problems described in `IERC20.approve`.
	*
	* Emits an `Approval` event indicating the updated allowance.
	*
	* Requirements:
	*
	* - `spender` cannot be the zero address.
	*/
	function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
	_approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));
	return true;
	}

	/**
	* @dev Atomically decreases the allowance granted to `spender` by the caller.
	*
	* This is an alternative to `approve` that can be used as a mitigation for
	* problems described in `IERC20.approve`.
	*
	* Emits an `Approval` event indicating the updated allowance.
	*
	* Requirements:
	*
	* - `spender` cannot be the zero address.
	* - `spender` must have allowance for the caller of at least
	* `subtractedValue`.
	*/
	function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
	_approve(msg.sender, spender, _allowances[msg.sender][spender].sub(subtractedValue));
	return true;
	}

	/**
	* @dev Moves tokens `amount` from `sender` to `recipient`.
	*
	* This is internal function is equivalent to `transfer`, and can be used to
	* e.g. implement automatic token fees, slashing mechanisms, etc.
	*
	* Emits a `Transfer` event.
	*
	* Requirements:
	*
	* - `sender` cannot be the zero address.
	* - `recipient` cannot be the zero address.
	* - `sender` must have a balance of at least `amount`.
	*/
	function _transfer(address sender, address recipient, uint256 amount) internal {
	require(sender != address(0), "ERC20: transfer from the zero address");
	require(recipient != address(0), "ERC20: transfer to the zero address");

	_balances[sender] = _balances[sender].sub(amount);
	_balances[recipient] = _balances[recipient].add(amount);
	emit Transfer(sender, recipient, amount);
	}

	/** @dev Creates `amount` tokens and assigns them to `account`, increasing
	* the total supply.
	*
	* Emits a `Transfer` event with `from` set to the zero address.
	*
	* Requirements
	*
	* - `to` cannot be the zero address.
	*/
	function _mint(address account, uint256 amount) internal {
	require(account != address(0), "ERC20: mint to the zero address");

	_totalSupply = _totalSupply.add(amount);
	_balances[account] = _balances[account].add(amount);
	emit Transfer(address(0), account, amount);
	}

	/**
	* @dev Destoys `amount` tokens from `account`, reducing the
	* total supply.
	*
	* Emits a `Transfer` event with `to` set to the zero address.
	*
	* Requirements
	*
	* - `account` cannot be the zero address.
	* - `account` must have at least `amount` tokens.
	*/
	function _burn(address account, uint256 value) internal {
	require(account != address(0), "ERC20: burn from the zero address");

	_totalSupply = _totalSupply.sub(value);
	_balances[account] = _balances[account].sub(value);
	emit Transfer(account, address(0), value);
	}

	/**
	* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
	*
	* This is internal function is equivalent to `approve`, and can be used to
	* e.g. set automatic allowances for certain subsystems, etc.
	*
	* Emits an `Approval` event.
	*
	* Requirements:
	*
	* - `owner` cannot be the zero address.
	* - `spender` cannot be the zero address.
	*/
	function _approve(address owner, address spender, uint256 value) internal {
	require(owner != address(0), "ERC20: approve from the zero address");
	require(spender != address(0), "ERC20: approve to the zero address");

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

	/**
	* @dev Destoys `amount` tokens from `account`.`amount` is then deducted
	* from the caller's allowance.
	*
	* See `_burn` and `_approve`.
	*/
	function _burnFrom(address account, uint256 amount) internal {
	_burn(account, amount);
	_approve(account, msg.sender, _allowances[account][msg.sender].sub(amount));
	}
	}



	/**
	* @dev Extension of `ERC20` that adds a set of accounts with the `MinterRole`,
	* which have permission to mint (create) new tokens as they see fit.
	*
	* At construction, the deployer of the contract is the only minter.
	*/
	contract ERC20Mintable is ERC20, MinterRole {
	/**
	* @dev See `ERC20._mint`.
	*
	* Requirements:
	*
	* - the caller must have the `MinterRole`.
	*/
	function mint(address account, uint256 amount) public onlyMinter returns (bool) {
	_mint(account, amount);
	return true;
	}
	}


	contract ERC20Capped is ERC20Mintable {
	uint256 private _cap;

	/**
	* @dev Sets the value of the `cap`. This value is immutable, it can only be
	* set once during construction.
	*/
	constructor (uint256 cap) public {
	require(cap > 0, "ERC20Capped: cap is 0");
	_cap = cap;
	}

	/**
	* @dev Returns the cap on the token's total supply.
	*/
	function cap() public view returns (uint256) {
	return _cap;
	}

	/**
	* @dev See `ERC20Mintable.mint`.
	*
	* Requirements:
	*
	* - `value` must not cause the total supply to go over the cap.
	*/
	function _mint(address account, uint256 value) internal {
	require(totalSupply().add(value) <= _cap, "ERC20Capped: cap exceeded");
	super._mint(account, value);
	}
	}

	contract ERC20Detailed is IERC20 {
	string private _name;
	string private _symbol;
	uint8 private _decimals;

	/**
	* @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
	* these values are immutable: they can only be set once during
	* construction.
	*/
	constructor (string memory name, string memory symbol, uint8 decimals) public {
	_name = name;
	_symbol = symbol;
	_decimals = decimals;
	}

	/**
	* @dev Returns the name of the token.
	*/
	function name() public view returns (string memory) {
	return _name;
	}

	/**
	* @dev Returns the symbol of the token, usually a shorter version of the
	* name.
	*/
	function symbol() public view returns (string memory) {
	return _symbol;
	}

	/**
	* @dev Returns the number of decimals used to get its user representation.
	* For example, if `decimals` equals `2`, a balance of `505` tokens should
	* be displayed to a user as `5,05` (`505 / 10 ** 2`).
	*
	* Tokens usually opt for a value of 18, imitating the relationship between
	* Ether and Wei.
	*
	* > Note that this information is only used for _display_ purposes: it in
	* no way affects any of the arithmetic of the contract, including
	* `IERC20.balanceOf` and `IERC20.transfer`.
	*/
	function decimals() public view returns (uint8) {
	return _decimals;
	}
	}

	contract Pausable is PauserRole {
	/**
	* @dev Emitted when the pause is triggered by a pauser (`account`).
	*/
	event Paused(address account);

	/**
	* @dev Emitted when the pause is lifted by a pauser (`account`).
	*/
	event Unpaused(address account);

	bool private _paused;

	/**
	* @dev Initializes the contract in unpaused state. Assigns the Pauser role
	* to the deployer.
	*/
	constructor () internal {
	_paused = false;
	}

	/**
	* @dev Returns true if the contract is paused, and false otherwise.
	*/
	function paused() public view returns (bool) {
	return _paused;
	}

	/**
	* @dev Modifier to make a function callable only when the contract is not paused.
	*/
	modifier whenNotPaused() {
	require(!_paused, "Pausable: paused");
	_;
	}

	/**
	* @dev Modifier to make a function callable only when the contract is paused.
	*/
	modifier whenPaused() {
	require(_paused, "Pausable: not paused");
	_;
	}

	/**
	* @dev Called by a pauser to pause, triggers stopped state.
	*/
	function pause() public onlyPauser whenNotPaused {
	_paused = true;
	emit Paused(msg.sender);
	}

	/**
	* @dev Called by a pauser to unpause, returns to normal state.
	*/
	function unpause() public onlyPauser whenPaused {
	_paused = false;
	emit Unpaused(msg.sender);
	}
	}

	contract ERC20Pausable is ERC20, Pausable {
	function transfer(address to, uint256 value) public whenNotPaused returns (bool) {
	return super.transfer(to, value);
	}

	function transferFrom(address from, address to, uint256 value) public whenNotPaused returns (bool) {
	return super.transferFrom(from, to, value);
	}

	function approve(address spender, uint256 value) public whenNotPaused returns (bool) {
	return super.approve(spender, value);
	}

	function increaseAllowance(address spender, uint addedValue) public whenNotPaused returns (bool) {
	return super.increaseAllowance(spender, addedValue);
	}

	function decreaseAllowance(address spender, uint subtractedValue) public whenNotPaused returns (bool) {
	return super.decreaseAllowance(spender, subtractedValue);
	}
	}

	contract USECNYToken is ERC20, ERC20Detailed, ERC20Capped, ERC20Pausable {

	constructor(
	)
	ERC20Detailed('USECNY', 'UCNY', 18)
	ERC20Capped(1(1010)(10**18))
	ERC20()
	ERC20Pausable()
	public
	payable
	{}

	}