Contract Source Code (Solidity)

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•  contract Ownable
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
•  contract StateSyncerVerifier is Ow ...
•    - function isOnlyStateSyncerContract()
•    - function changeStateSyncerAddress(add ...
• interface StateReceiver
•    - function onStateReceive(uint256 id, b ...
• 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 ChainIdMixin
•  contract LibEIP712Domain is ChainI ...
•    - function hashEIP712Message(bytes32 ha ...
•  contract LibTokenTransferOrder is ...
•    - function getTokenTransferOrderHash(
•    - function hashTokenTransferOrder(
•  contract ChildToken is Ownable, Li ...
•    - function deposit(address user, uint25 ...
•    - function withdraw(uint256 amountOrTok ...
•    - function setParent(address _parent)
•    - function ecrecovery(bytes32 hash, byt ...
• interface IERC20
•    - function transfer(address to, uint256 ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
•    - function totalSupply()
•    - function balanceOf(address who)
•    - function allowance(address owner, add ...
•  contract ERC20Detailed is IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•  contract ERC20 is IERC20
•    - function totalSupply()
•    - function balanceOf(address owner)
•    - function allowance(address owner, add ...
•    - function transfer(address to, uint256 ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function _transfer(address from, addr ...
•    - function _mint(address account, uint2 ...
•    - function _burn(address account, uint2 ...
•    - function _approve(address owner, addr ...
•    - function _burnFrom(address account, u ...
•  contract BaseERC20 is ChildToken
•    - function transferWithSig(
•    - function balanceOf(address account)
•    - function _transfer(address sender, ad ...
•    - function _transferFrom(address from, ...
• interface IParentToken
•    - function beforeTransfer(address sende ...
•  contract ChildERC20 is BaseERC20, ...
•    - function setParent(address _parent)
•    - function deposit(address user, uint25 ...
•    - function withdraw(uint256 amount)
•    - function transfer(address to, uint256 ...
•    - function allowance(address, address)
•    - function approve(address, uint256)
•    - function transferFrom(address, addres ...
• interface IERC165
•    - function supportsInterface(bytes4 int ...
•  contract IERC721 is IERC165
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address own ...
•    - function transferFrom(address from, a ...
•    - function safeTransferFrom(address fro ...
•    - function safeTransferFrom(address fro ...
•  contract IERC721Receiver
•    - function onERC721Received(address ope ...
• library Address
•    - function isContract(address account)
• library Counters
•    - function current(Counter storage coun ...
•    - function increment(Counter storage co ...
•    - function decrement(Counter storage co ...
•  contract ERC165 is IERC165
•    - function supportsInterface(bytes4 int ...
•    - function _registerInterface(bytes4 in ...
•  contract ERC721 is ERC165, IERC721
•    - function balanceOf(address owner)
•    - function ownerOf(uint256 tokenId)
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address to ...
•    - function isApprovedForAll(address own ...
•    - function transferFrom(address from, a ...
•    - function safeTransferFrom(address fro ...
•    - function safeTransferFrom(address fro ...
•    - function _exists(uint256 tokenId)
•    - function _isApprovedOrOwner(address s ...
•    - function _mint(address to, uint256 to ...
•    - function _burn(address owner, uint256 ...
•    - function _burn(uint256 tokenId)
•    - function _transferFrom(address from, ...
•    - function _checkOnERC721Received(addre ...
•    - function _clearApproval(uint256 token ...
•  contract IERC721Enumerable is IERC ...
•    - function totalSupply()
•    - function tokenOfOwnerByIndex(address ...
•    - function tokenByIndex(uint256 index)
•  contract ERC721Enumerable is ERC16 ...
•    - function tokenOfOwnerByIndex(address ...
•    - function totalSupply()
•    - function tokenByIndex(uint256 index)
•    - function _transferFrom(address from, ...
•    - function _mint(address to, uint256 to ...
•    - function _burn(address owner, uint256 ...
•    - function _tokensOfOwner(address owner ...
•    - function _addTokenToOwnerEnumeration( ...
•    - function _addTokenToAllTokensEnumerat ...
•    - function _removeTokenFromOwnerEnumera ...
•    - function _removeTokenFromAllTokensEnu ...
•  contract IERC721Metadata is IERC72 ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 tokenId)
•  contract ERC721Metadata is ERC165, ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 tokenId)
•    - function _setTokenURI(uint256 tokenId ...
•    - function _burn(address owner, uint256 ...
•  contract ERC721Full is ERC721, ERC ...
•  contract ChildERC721 is ChildToken ...
•    - function transferWithSig(
•    - function setParent(address _parent)
•    - function approve(address to, uint256 ...
•    - function getApproved(uint256 tokenId)
•    - function setApprovalForAll(address op ...
•    - function isApprovedForAll(address own ...
•    - function deposit(address user, uint25 ...
•    - function withdraw(uint256 tokenId)
•    - function transferFrom(address from, a ...
•    - function _transferFrom(address from, ...
•  contract ChildChain is Ownable, St ... *
•    - function onStateReceive(
•    - function addToken(
•    - function mapToken(address rootToken, ...
•    - function withdrawTokens(
•    - function depositTokens(

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/**
 *Submitted for verification at polygonscan.com on 2021-05-18
*/

// File: openzeppelin-solidity/contracts/ownership/Ownable.sol

pragma solidity ^0.5.2;

/**
 * @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;
    }
}

// File: contracts/child/bor/StateSyncerVerifier.sol

pragma solidity ^0.5.2;


contract StateSyncerVerifier is Ownable {
    address public stateSyncer;

    event StateSyncerAddressChanged(
        address indexed previousAddress,
        address indexed newAddress
    );

    /**
   * @dev Throws if called by any account other than state syncer
   */
    modifier onlyStateSyncer() {
        require(
            isOnlyStateSyncerContract(),
            "State syncer: caller is not the state syncer contract"
        );
        _;
    }

    // initial setup
    constructor() public {
        // default state syncer contract
        stateSyncer = 0x0000000000000000000000000000000000001001;

        // emit event for first change
        emit StateSyncerAddressChanged(address(0), stateSyncer);
    }

    /**
   * @dev Returns true if the caller is the state syncer contract
   * TODO: replace onlyOwner ownership with 0x1000 for validator majority
   */
    function isOnlyStateSyncerContract() public view returns (bool) {
        return msg.sender == stateSyncer;
    }

    // change state syncer address
    function changeStateSyncerAddress(address newAddress) public onlyOwner {
        require(
            newAddress != address(0),
            "State syncer: new state syncer address is the zero address"
        );
        emit StateSyncerAddressChanged(stateSyncer, newAddress);
        stateSyncer = newAddress;
    }
}

// File: contracts/child/bor/StateReceiver.sol

pragma solidity ^0.5.2;

// StateReceiver represents interface to receive state
interface StateReceiver {
    function onStateReceive(uint256 id, bytes calldata data) external;
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol

pragma solidity ^0.5.2;

/**
 * @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;
    }
}

// File: contracts/common/mixin/ChainIdMixin.sol

pragma solidity ^0.5.2;

contract ChainIdMixin {
  bytes constant public networkId = hex"89";
  uint256 constant public CHAINID = 137;
}

// File: contracts/child/misc/EIP712.sol

pragma solidity ^0.5.2;


contract LibEIP712Domain is ChainIdMixin {
    string internal constant EIP712_DOMAIN_SCHEMA = "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)";
    bytes32 public constant EIP712_DOMAIN_SCHEMA_HASH = keccak256(
        abi.encodePacked(EIP712_DOMAIN_SCHEMA)
    );

    string internal constant EIP712_DOMAIN_NAME = "Matic Network";
    string internal constant EIP712_DOMAIN_VERSION = "1";
    uint256 internal constant EIP712_DOMAIN_CHAINID = CHAINID;

    bytes32 public EIP712_DOMAIN_HASH;

    constructor() public {
        EIP712_DOMAIN_HASH = keccak256(
            abi.encode(
                EIP712_DOMAIN_SCHEMA_HASH,
                keccak256(bytes(EIP712_DOMAIN_NAME)),
                keccak256(bytes(EIP712_DOMAIN_VERSION)),
                EIP712_DOMAIN_CHAINID,
                address(this)
            )
        );
    }

    function hashEIP712Message(bytes32 hashStruct)
        internal
        view
        returns (bytes32 result)
    {
        bytes32 domainHash = EIP712_DOMAIN_HASH;

        // Assembly for more efficient computing:
        // keccak256(abi.encode(
        //     EIP191_HEADER,
        //     domainHash,
        //     hashStruct
        // ));

        assembly {
            // Load free memory pointer
            let memPtr := mload(64)

            mstore(
                memPtr,
                0x1901000000000000000000000000000000000000000000000000000000000000
            ) // EIP191 header
            mstore(add(memPtr, 2), domainHash) // EIP712 domain hash
            mstore(add(memPtr, 34), hashStruct) // Hash of struct

            // Compute hash
            result := keccak256(memPtr, 66)
        }
        return result;
    }
}

// File: contracts/child/misc/LibTokenTransferOrder.sol

pragma solidity ^0.5.2;


contract LibTokenTransferOrder is LibEIP712Domain {
    string internal constant EIP712_TOKEN_TRANSFER_ORDER_SCHEMA = "TokenTransferOrder(address spender,uint256 tokenIdOrAmount,bytes32 data,uint256 expiration)";
    bytes32 public constant EIP712_TOKEN_TRANSFER_ORDER_SCHEMA_HASH = keccak256(
        abi.encodePacked(EIP712_TOKEN_TRANSFER_ORDER_SCHEMA)
    );

    struct TokenTransferOrder {
        address spender;
        uint256 tokenIdOrAmount;
        bytes32 data;
        uint256 expiration;
    }

    function getTokenTransferOrderHash(
        address spender,
        uint256 tokenIdOrAmount,
        bytes32 data,
        uint256 expiration
    ) public view returns (bytes32 orderHash) {
        orderHash = hashEIP712Message(
            hashTokenTransferOrder(spender, tokenIdOrAmount, data, expiration)
        );
    }

    function hashTokenTransferOrder(
        address spender,
        uint256 tokenIdOrAmount,
        bytes32 data,
        uint256 expiration
    ) internal pure returns (bytes32 result) {
        bytes32 schemaHash = EIP712_TOKEN_TRANSFER_ORDER_SCHEMA_HASH;

        // Assembly for more efficiently computing:
        // return keccak256(abi.encode(
        //   schemaHash,
        //   spender,
        //   tokenIdOrAmount,
        //   data,
        //   expiration
        // ));

        assembly {
            // Load free memory pointer
            let memPtr := mload(64)

            mstore(memPtr, schemaHash) // hash of schema
            mstore(
                add(memPtr, 32),
                and(spender, 0xffffffffffffffffffffffffffffffffffffffff)
            ) // spender
            mstore(add(memPtr, 64), tokenIdOrAmount) // tokenIdOrAmount
            mstore(add(memPtr, 96), data) // hash of data
            mstore(add(memPtr, 128), expiration) // expiration

            // Compute hash
            result := keccak256(memPtr, 160)
        }
        return result;
    }
}

// File: contracts/child/ChildToken.sol

pragma solidity ^0.5.2;




contract ChildToken is Ownable, LibTokenTransferOrder {
    using SafeMath for uint256;

    // ERC721/ERC20 contract token address on root chain
    address public token;
    address public parent;
    address public parentOwner;

    mapping(bytes32 => bool) public disabledHashes;

    modifier isParentOwner() {
        require(msg.sender == parentOwner);
        _;
    }

    function deposit(address user, uint256 amountOrTokenId) public;
    function withdraw(uint256 amountOrTokenId) public payable;
    function setParent(address _parent) public;

    event LogFeeTransfer(
        address indexed token,
        address indexed from,
        address indexed to,
        uint256 amount,
        uint256 input1,
        uint256 input2,
        uint256 output1,
        uint256 output2
    );

    function ecrecovery(bytes32 hash, bytes memory sig)
        public
        pure
        returns (address result)
    {
        bytes32 r;
        bytes32 s;
        uint8 v;
        if (sig.length != 65) {
            return address(0x0);
        }
        assembly {
            r := mload(add(sig, 32))
            s := mload(add(sig, 64))
            v := and(mload(add(sig, 65)), 255)
        }
        // https://github.com/ethereum/go-ethereum/issues/2053
        if (v < 27) {
            v += 27;
        }
        if (v != 27 && v != 28) {
            return address(0x0);
        }
        // get address out of hash and signature
        result = ecrecover(hash, v, r, s);
        // ecrecover returns zero on error
        require(result != address(0x0), "Error in ecrecover");
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol

pragma solidity ^0.5.2;

/**
 * @title ERC20 interface
 * @dev see https://eips.ethereum.org/EIPS/eip-20
 */
interface IERC20 {
    function transfer(address to, uint256 value) external returns (bool);

    function approve(address spender, uint256 value) external returns (bool);

    function transferFrom(address from, address to, uint256 value) external returns (bool);

    function totalSupply() external view returns (uint256);

    function balanceOf(address who) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    event Transfer(address indexed from, address indexed to, uint256 value);

    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol

pragma solidity ^0.5.2;


/**
 * @title ERC20Detailed token
 * @dev The decimals are only for visualization purposes.
 * All the operations are done using the smallest and indivisible token unit,
 * just as on Ethereum all the operations are done in wei.
 */
contract ERC20Detailed is IERC20 {
    string private _name;
    string private _symbol;
    uint8 private _decimals;

    constructor (string memory name, string memory symbol, uint8 decimals) public {
        _name = name;
        _symbol = symbol;
        _decimals = decimals;
    }

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

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

    /**
     * @return the number of decimals of the token.
     */
    function decimals() public view returns (uint8) {
        return _decimals;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol

pragma solidity ^0.5.2;



/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://eips.ethereum.org/EIPS/eip-20
 * Originally based on code by FirstBlood:
 * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 *
 * This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for
 * all accounts just by listening to said events. Note that this isn't required by the specification, and other
 * compliant implementations may not do it.
 */
contract ERC20 is IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    /**
     * @dev Total number of tokens in existence
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev Gets the balance of the specified address.
     * @param owner The address to query the balance of.
     * @return A uint256 representing the amount owned by the passed address.
     */
    function balanceOf(address owner) public view returns (uint256) {
        return _balances[owner];
    }

    /**
     * @dev Function to check the amount of tokens that an owner allowed to a spender.
     * @param owner address The address which owns the funds.
     * @param spender address The address which will spend the funds.
     * @return A uint256 specifying the amount of tokens still available for the spender.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowed[owner][spender];
    }

    /**
     * @dev Transfer token to a specified address
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     */
    function transfer(address to, uint256 value) public returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
     * 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
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     */
    function approve(address spender, uint256 value) public returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Transfer tokens from one address to another.
     * Note that while this function emits an Approval event, this is not required as per the specification,
     * and other compliant implementations may not emit the event.
     * @param from address The address which you want to send tokens from
     * @param to address The address which you want to transfer to
     * @param value uint256 the amount of tokens to be transferred
     */
    function transferFrom(address from, address to, uint256 value) public returns (bool) {
        _transfer(from, to, value);
        _approve(from, msg.sender, _allowed[from][msg.sender].sub(value));
        return true;
    }

    /**
     * @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 returns (bool) {
        _approve(msg.sender, spender, _allowed[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 returns (bool) {
        _approve(msg.sender, spender, _allowed[msg.sender][spender].sub(subtractedValue));
        return true;
    }

    /**
     * @dev Transfer token for a specified addresses
     * @param from The address to transfer from.
     * @param to The address to transfer to.
     * @param value The amount to be transferred.
     */
    function _transfer(address from, address to, uint256 value) internal {
        require(to != address(0));

        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(value);
        emit Transfer(from, to, value);
    }

    /**
     * @dev Internal function that mints an amount of the token and assigns it to
     * an account. This encapsulates the modification of balances such that the
     * proper events are emitted.
     * @param account The account that will receive the created tokens.
     * @param value The amount that will be created.
     */
    function _mint(address account, uint256 value) internal {
        require(account != address(0));

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

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account.
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burn(address account, uint256 value) internal {
        require(account != address(0));

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

    /**
     * @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));

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

    /**
     * @dev Internal function that burns an amount of the token of a given
     * account, deducting from the sender's allowance for said account. Uses the
     * internal burn function.
     * Emits an Approval event (reflecting the reduced allowance).
     * @param account The account whose tokens will be burnt.
     * @param value The amount that will be burnt.
     */
    function _burnFrom(address account, uint256 value) internal {
        _burn(account, value);
        _approve(account, msg.sender, _allowed[account][msg.sender].sub(value));
    }
}

// File: contracts/child/BaseERC20.sol

pragma solidity ^0.5.2;


contract BaseERC20 is ChildToken {
    event Deposit(
        address indexed token,
        address indexed from,
        uint256 amount,
        uint256 input1,
        uint256 output1
    );

    event Withdraw(
        address indexed token,
        address indexed from,
        uint256 amount,
        uint256 input1,
        uint256 output1
    );

    event LogTransfer(
        address indexed token,
        address indexed from,
        address indexed to,
        uint256 amount,
        uint256 input1,
        uint256 input2,
        uint256 output1,
        uint256 output2
    );

    constructor() public {}

    function transferWithSig(
        bytes calldata sig,
        uint256 amount,
        bytes32 data,
        uint256 expiration,
        address to
    ) external returns (address from) {
        require(amount > 0);
        require(
            expiration == 0 || block.number <= expiration,
            "Signature is expired"
        );

        bytes32 dataHash = getTokenTransferOrderHash(
            msg.sender,
            amount,
            data,
            expiration
        );
        require(disabledHashes[dataHash] == false, "Sig deactivated");
        disabledHashes[dataHash] = true;

        from = ecrecovery(dataHash, sig);
        _transferFrom(from, address(uint160(to)), amount);
    }

    function balanceOf(address account) external view returns (uint256);
    function _transfer(address sender, address recipient, uint256 amount)
        internal;

    /// @param from Address from where tokens are withdrawn.
    /// @param to Address to where tokens are sent.
    /// @param value Number of tokens to transfer.
    /// @return Returns success of function call.
    function _transferFrom(address from, address to, uint256 value)
        internal
        returns (bool)
    {
        uint256 input1 = this.balanceOf(from);
        uint256 input2 = this.balanceOf(to);
        _transfer(from, to, value);
        emit LogTransfer(
            token,
            from,
            to,
            value,
            input1,
            input2,
            this.balanceOf(from),
            this.balanceOf(to)
        );
        return true;
    }
}

// File: contracts/child/misc/IParentToken.sol

pragma solidity ^0.5.2;
//interface for parent contract of any child token

interface IParentToken {
    function beforeTransfer(address sender, address to, uint256 value)
        external
        returns (bool);
}

// File: contracts/child/ChildERC20.sol

pragma solidity ^0.5.2;





contract ChildERC20 is BaseERC20, ERC20, ERC20Detailed {
    constructor(
        address _owner,
        address _token,
        string memory _name,
        string memory _symbol,
        uint8 _decimals
    ) public ERC20Detailed(_name, _symbol, _decimals) {
        require(_token != address(0x0) && _owner != address(0x0));
        parentOwner = _owner;
        token = _token;
    }

    function setParent(address _parent) public isParentOwner {
        require(_parent != address(0x0));
        parent = _parent;
    }

    /**
   * Deposit tokens
   *
   * @param user address for address
   * @param amount token balance
   */
    function deposit(address user, uint256 amount) public onlyOwner {
        // check for amount and user
        require(amount > 0 && user != address(0x0));

        // input balance
        uint256 input1 = balanceOf(user);

        // increase balance
        _mint(user, amount);

        // deposit events
        emit Deposit(token, user, amount, input1, balanceOf(user));
    }

    /**
   * Withdraw tokens
   *
   * @param amount tokens
   */
    function withdraw(uint256 amount) public payable {
        address user = msg.sender;
        // input balance
        uint256 input = balanceOf(user);

        // check for amount
        require(amount > 0 && input >= amount);

        // decrease balance
        _burn(user, amount);

        // withdraw event
        emit Withdraw(token, user, amount, input, balanceOf(user));
    }

    /// @dev Function that is called when a user or another contract wants to transfer funds.
    /// @param to Address of token receiver.
    /// @param value Number of tokens to transfer.
    /// @return Returns success of function call.
    function transfer(address to, uint256 value) public returns (bool) {
        if (
            parent != address(0x0) &&
            !IParentToken(parent).beforeTransfer(msg.sender, to, value)
        ) {
            return false;
        }
        return _transferFrom(msg.sender, to, value);
    }

    function allowance(address, address) public view returns (uint256) {
        revert("Disabled feature");
    }

    function approve(address, uint256) public returns (bool) {
        revert("Disabled feature");
    }

    function transferFrom(address, address, uint256) public returns (bool) {
        revert("Disabled feature");
    }
}

// File: openzeppelin-solidity/contracts/introspection/IERC165.sol

pragma solidity ^0.5.2;

/**
 * @title IERC165
 * @dev https://eips.ethereum.org/EIPS/eip-165
 */
interface IERC165 {
    /**
     * @notice Query if a contract implements an interface
     * @param interfaceId The interface identifier, as specified in ERC-165
     * @dev Interface identification is specified in ERC-165. This function
     * uses less than 30,000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721.sol

pragma solidity ^0.5.2;


/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    function balanceOf(address owner) public view returns (uint256 balance);
    function ownerOf(uint256 tokenId) public view returns (address owner);

    function approve(address to, uint256 tokenId) public;
    function getApproved(uint256 tokenId) public view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) public;
    function isApprovedForAll(address owner, address operator) public view returns (bool);

    function transferFrom(address from, address to, uint256 tokenId) public;
    function safeTransferFrom(address from, address to, uint256 tokenId) public;

    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Receiver.sol

pragma solidity ^0.5.2;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
contract IERC721Receiver {
    /**
     * @notice Handle the receipt of an NFT
     * @dev The ERC721 smart contract calls this function on the recipient
     * after a `safeTransfer`. This function MUST return the function selector,
     * otherwise the caller will revert the transaction. The selector to be
     * returned can be obtained as `this.onERC721Received.selector`. This
     * function MAY throw to revert and reject the transfer.
     * Note: the ERC721 contract address is always the message sender.
     * @param operator The address which called `safeTransferFrom` function
     * @param from The address which previously owned the token
     * @param tokenId The NFT identifier which is being transferred
     * @param data Additional data with no specified format
     * @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data)
    public returns (bytes4);
}

// File: openzeppelin-solidity/contracts/utils/Address.sol

pragma solidity ^0.5.2;

/**
 * Utility library of inline functions on addresses
 */
library Address {
    /**
     * Returns whether the target address is a contract
     * @dev This function will return false if invoked during the constructor of a contract,
     * as the code is not actually created until after the constructor finishes.
     * @param account address of the account to check
     * @return whether the target address is a contract
     */
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        // XXX Currently there is no better way to check if there is a contract in an address
        // than to check the size of the code at that address.
        // See https://ethereum.stackexchange.com/a/14016/36603
        // for more details about how this works.
        // TODO Check this again before the Serenity release, because all addresses will be
        // contracts then.
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

// File: openzeppelin-solidity/contracts/drafts/Counters.sol

pragma solidity ^0.5.2;


/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids
 *
 * Include with `using Counters for Counters.Counter;`
 * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the SafeMath
 * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
 * directly accessed.
 */
library Counters {
    using SafeMath for uint256;

    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {
        counter._value += 1;
    }

    function decrement(Counter storage counter) internal {
        counter._value = counter._value.sub(1);
    }
}

// File: openzeppelin-solidity/contracts/introspection/ERC165.sol

pragma solidity ^0.5.2;


/**
 * @title ERC165
 * @author Matt Condon (@shrugs)
 * @dev Implements ERC165 using a lookup table.
 */
contract ERC165 is IERC165 {
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;
    /*
     * 0x01ffc9a7 ===
     *     bytes4(keccak256('supportsInterface(bytes4)'))
     */

    /**
     * @dev a mapping of interface id to whether or not it's supported
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    /**
     * @dev A contract implementing SupportsInterfaceWithLookup
     * implement ERC165 itself
     */
    constructor () internal {
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev implement supportsInterface(bytes4) using a lookup table
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev internal method for registering an interface
     */
    function _registerInterface(bytes4 interfaceId) internal {
        require(interfaceId != 0xffffffff);
        _supportedInterfaces[interfaceId] = true;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC721/ERC721.sol

pragma solidity ^0.5.2;







/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is ERC165, IERC721 {
    using SafeMath for uint256;
    using Address for address;
    using Counters for Counters.Counter;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from token ID to owner
    mapping (uint256 => address) private _tokenOwner;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to number of owned token
    mapping (address => Counters.Counter) private _ownedTokensCount;

    // Mapping from owner to operator approvals
    mapping (address => mapping (address => bool)) private _operatorApprovals;

    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;
    /*
     * 0x80ac58cd ===
     *     bytes4(keccak256('balanceOf(address)')) ^
     *     bytes4(keccak256('ownerOf(uint256)')) ^
     *     bytes4(keccak256('approve(address,uint256)')) ^
     *     bytes4(keccak256('getApproved(uint256)')) ^
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) ^
     *     bytes4(keccak256('isApprovedForAll(address,address)')) ^
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) ^
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
     */

    constructor () public {
        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
    }

    /**
     * @dev Gets the balance of the specified address
     * @param owner address to query the balance of
     * @return uint256 representing the amount owned by the passed address
     */
    function balanceOf(address owner) public view returns (uint256) {
        require(owner != address(0));
        return _ownedTokensCount[owner].current();
    }

    /**
     * @dev Gets the owner of the specified token ID
     * @param tokenId uint256 ID of the token to query the owner of
     * @return address currently marked as the owner of the given token ID
     */
    function ownerOf(uint256 tokenId) public view returns (address) {
        address owner = _tokenOwner[tokenId];
        require(owner != address(0));
        return owner;
    }

    /**
     * @dev Approves another address to transfer the given token ID
     * The zero address indicates there is no approved address.
     * There can only be one approved address per token at a given time.
     * Can only be called by the token owner or an approved operator.
     * @param to address to be approved for the given token ID
     * @param tokenId uint256 ID of the token to be approved
     */
    function approve(address to, uint256 tokenId) public {
        address owner = ownerOf(tokenId);
        require(to != owner);
        require(msg.sender == owner || isApprovedForAll(owner, msg.sender));

        _tokenApprovals[tokenId] = to;
        emit Approval(owner, to, tokenId);
    }

    /**
     * @dev Gets the approved address for a token ID, or zero if no address set
     * Reverts if the token ID does not exist.
     * @param tokenId uint256 ID of the token to query the approval of
     * @return address currently approved for the given token ID
     */
    function getApproved(uint256 tokenId) public view returns (address) {
        require(_exists(tokenId));
        return _tokenApprovals[tokenId];
    }

    /**
     * @dev Sets or unsets the approval of a given operator
     * An operator is allowed to transfer all tokens of the sender on their behalf
     * @param to operator address to set the approval
     * @param approved representing the status of the approval to be set
     */
    function setApprovalForAll(address to, bool approved) public {
        require(to != msg.sender);
        _operatorApprovals[msg.sender][to] = approved;
        emit ApprovalForAll(msg.sender, to, approved);
    }

    /**
     * @dev Tells whether an operator is approved by a given owner
     * @param owner owner address which you want to query the approval of
     * @param operator operator address which you want to query the approval of
     * @return bool whether the given operator is approved by the given owner
     */
    function isApprovedForAll(address owner, address operator) public view returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev Transfers the ownership of a given token ID to another address
     * Usage of this method is discouraged, use `safeTransferFrom` whenever possible
     * Requires the msg.sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function transferFrom(address from, address to, uint256 tokenId) public {
        require(_isApprovedOrOwner(msg.sender, tokenId));

        _transferFrom(from, to, tokenId);
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement `onERC721Received`,
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement `onERC721Received`,
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public {
        transferFrom(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data));
    }

    /**
     * @dev Returns whether the specified token exists
     * @param tokenId uint256 ID of the token to query the existence of
     * @return bool whether the token exists
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        address owner = _tokenOwner[tokenId];
        return owner != address(0);
    }

    /**
     * @dev Returns whether the given spender can transfer a given token ID
     * @param spender address of the spender to query
     * @param tokenId uint256 ID of the token to be transferred
     * @return bool whether the msg.sender is approved for the given token ID,
     * is an operator of the owner, or is the owner of the token
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
        address owner = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Internal function to mint a new token
     * Reverts if the given token ID already exists
     * @param to The address that will own the minted token
     * @param tokenId uint256 ID of the token to be minted
     */
    function _mint(address to, uint256 tokenId) internal {
        require(to != address(0));
        require(!_exists(tokenId));

        _tokenOwner[tokenId] = to;
        _ownedTokensCount[to].increment();

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Internal function to burn a specific token
     * Reverts if the token does not exist
     * Deprecated, use _burn(uint256) instead.
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(address owner, uint256 tokenId) internal {
        require(ownerOf(tokenId) == owner);

        _clearApproval(tokenId);

        _ownedTokensCount[owner].decrement();
        _tokenOwner[tokenId] = address(0);

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Internal function to burn a specific token
     * Reverts if the token does not exist
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(uint256 tokenId) internal {
        _burn(ownerOf(tokenId), tokenId);
    }

    /**
     * @dev Internal function to transfer ownership of a given token ID to another address.
     * As opposed to transferFrom, this imposes no restrictions on msg.sender.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _transferFrom(address from, address to, uint256 tokenId) internal {
        require(ownerOf(tokenId) == from);
        require(to != address(0));

        _clearApproval(tokenId);

        _ownedTokensCount[from].decrement();
        _ownedTokensCount[to].increment();

        _tokenOwner[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Internal function to invoke `onERC721Received` on a target address
     * The call is not executed if the target address is not a contract
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        internal returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }

        bytes4 retval = IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data);
        return (retval == _ERC721_RECEIVED);
    }

    /**
     * @dev Private function to clear current approval of a given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _clearApproval(uint256 tokenId) private {
        if (_tokenApprovals[tokenId] != address(0)) {
            _tokenApprovals[tokenId] = address(0);
        }
    }
}

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Enumerable.sol

pragma solidity ^0.5.2;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract IERC721Enumerable is IERC721 {
    function totalSupply() public view returns (uint256);
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256 tokenId);

    function tokenByIndex(uint256 index) public view returns (uint256);
}

// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Enumerable.sol

pragma solidity ^0.5.2;




/**
 * @title ERC-721 Non-Fungible Token with optional enumeration extension logic
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721Enumerable is ERC165, ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => uint256[]) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;
    /*
     * 0x780e9d63 ===
     *     bytes4(keccak256('totalSupply()')) ^
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
     *     bytes4(keccak256('tokenByIndex(uint256)'))
     */

    /**
     * @dev Constructor function
     */
    constructor () public {
        // register the supported interface to conform to ERC721Enumerable via ERC165
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev Gets the token ID at a given index of the tokens list of the requested owner
     * @param owner address owning the tokens list to be accessed
     * @param index uint256 representing the index to be accessed of the requested tokens list
     * @return uint256 token ID at the given index of the tokens list owned by the requested address
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
        require(index < balanceOf(owner));
        return _ownedTokens[owner][index];
    }

    /**
     * @dev Gets the total amount of tokens stored by the contract
     * @return uint256 representing the total amount of tokens
     */
    function totalSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev Gets the token ID at a given index of all the tokens in this contract
     * Reverts if the index is greater or equal to the total number of tokens
     * @param index uint256 representing the index to be accessed of the tokens list
     * @return uint256 token ID at the given index of the tokens list
     */
    function tokenByIndex(uint256 index) public view returns (uint256) {
        require(index < totalSupply());
        return _allTokens[index];
    }

    /**
     * @dev Internal function to transfer ownership of a given token ID to another address.
     * As opposed to transferFrom, this imposes no restrictions on msg.sender.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _transferFrom(address from, address to, uint256 tokenId) internal {
        super._transferFrom(from, to, tokenId);

        _removeTokenFromOwnerEnumeration(from, tokenId);

        _addTokenToOwnerEnumeration(to, tokenId);
    }

    /**
     * @dev Internal function to mint a new token
     * Reverts if the given token ID already exists
     * @param to address the beneficiary that will own the minted token
     * @param tokenId uint256 ID of the token to be minted
     */
    function _mint(address to, uint256 tokenId) internal {
        super._mint(to, tokenId);

        _addTokenToOwnerEnumeration(to, tokenId);

        _addTokenToAllTokensEnumeration(tokenId);
    }

    /**
     * @dev Internal function to burn a specific token
     * Reverts if the token does not exist
     * Deprecated, use _burn(uint256) instead
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(address owner, uint256 tokenId) internal {
        super._burn(owner, tokenId);

        _removeTokenFromOwnerEnumeration(owner, tokenId);
        // Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund
        _ownedTokensIndex[tokenId] = 0;

        _removeTokenFromAllTokensEnumeration(tokenId);
    }

    /**
     * @dev Gets the list of token IDs of the requested owner
     * @param owner address owning the tokens
     * @return uint256[] List of token IDs owned by the requested address
     */
    function _tokensOfOwner(address owner) internal view returns (uint256[] storage) {
        return _ownedTokens[owner];
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the _ownedTokensIndex mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        _ownedTokens[from].length--;

        // Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occupied by
        // lastTokenId, or just over the end of the array if the token was the last one).
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        _allTokens.length--;
        _allTokensIndex[tokenId] = 0;
    }
}

// File: openzeppelin-solidity/contracts/token/ERC721/IERC721Metadata.sol

pragma solidity ^0.5.2;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract IERC721Metadata is IERC721 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Metadata.sol

pragma solidity ^0.5.2;




contract ERC721Metadata is ERC165, ERC721, IERC721Metadata {
    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;
    /*
     * 0x5b5e139f ===
     *     bytes4(keccak256('name()')) ^
     *     bytes4(keccak256('symbol()')) ^
     *     bytes4(keccak256('tokenURI(uint256)'))
     */

    /**
     * @dev Constructor function
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
    }

    /**
     * @dev Gets the token name
     * @return string representing the token name
     */
    function name() external view returns (string memory) {
        return _name;
    }

    /**
     * @dev Gets the token symbol
     * @return string representing the token symbol
     */
    function symbol() external view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns an URI for a given token ID
     * Throws if the token ID does not exist. May return an empty string.
     * @param tokenId uint256 ID of the token to query
     */
    function tokenURI(uint256 tokenId) external view returns (string memory) {
        require(_exists(tokenId));
        return _tokenURIs[tokenId];
    }

    /**
     * @dev Internal function to set the token URI for a given token
     * Reverts if the token ID does not exist
     * @param tokenId uint256 ID of the token to set its URI
     * @param uri string URI to assign
     */
    function _setTokenURI(uint256 tokenId, string memory uri) internal {
        require(_exists(tokenId));
        _tokenURIs[tokenId] = uri;
    }

    /**
     * @dev Internal function to burn a specific token
     * Reverts if the token does not exist
     * Deprecated, use _burn(uint256) instead
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned by the msg.sender
     */
    function _burn(address owner, uint256 tokenId) internal {
        super._burn(owner, tokenId);

        // Clear metadata (if any)
        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Full.sol

pragma solidity ^0.5.2;




/**
 * @title Full ERC721 Token
 * This implementation includes all the required and some optional functionality of the ERC721 standard
 * Moreover, it includes approve all functionality using operator terminology
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721Full is ERC721, ERC721Enumerable, ERC721Metadata {
    constructor (string memory name, string memory symbol) public ERC721Metadata(name, symbol) {
        // solhint-disable-previous-line no-empty-blocks
    }
}

// File: contracts/child/ChildERC721.sol

pragma solidity ^0.5.2;


contract ChildERC721 is ChildToken, ERC721Full {
    event Deposit(address indexed token, address indexed from, uint256 tokenId);

    event Withdraw(
        address indexed token,
        address indexed from,
        uint256 tokenId
    );

    event LogTransfer(
        address indexed token,
        address indexed from,
        address indexed to,
        uint256 tokenId
    );

    constructor(
        address _owner,
        address _token,
        string memory name,
        string memory symbol
    ) public ERC721Full(name, symbol) {
        require(_token != address(0x0) && _owner != address(0x0));
        parentOwner = _owner;
        token = _token;
    }

    function transferWithSig(
        bytes calldata sig,
        uint256 tokenId,
        bytes32 data,
        uint256 expiration,
        address to
    ) external returns (address) {
        require(
            expiration == 0 || block.number <= expiration,
            "Signature is expired"
        );

        bytes32 dataHash = getTokenTransferOrderHash(
            msg.sender,
            tokenId,
            data,
            expiration
        );
        require(disabledHashes[dataHash] == false, "Sig deactivated");
        disabledHashes[dataHash] = true;

        // recover address and send tokens
        address from = ecrecovery(dataHash, sig);
        _transferFrom(from, to, tokenId);
        require(
            _checkOnERC721Received(from, to, tokenId, ""),
            "_checkOnERC721Received failed"
        );
        return from;
    }

    function setParent(address _parent) public isParentOwner {
        require(_parent != address(0x0));
        parent = _parent;
    }

    function approve(address to, uint256 tokenId) public {
        revert("Disabled feature");
    }

    function getApproved(uint256 tokenId)
        public
        view
        returns (address operator)
    {
        revert("Disabled feature");
    }

    function setApprovalForAll(address operator, bool _approved) public {
        revert("Disabled feature");
    }

    function isApprovedForAll(address owner, address operator)
        public
        view
        returns (bool)
    {
        revert("Disabled feature");
    }

    /**
   * @notice Deposit tokens
   * @param user address for deposit
   * @param tokenId tokenId to mint to user's account
   */
    function deposit(address user, uint256 tokenId) public onlyOwner {
        require(user != address(0x0));
        _mint(user, tokenId);
        emit Deposit(token, user, tokenId);
    }

    /**
   * @notice Withdraw tokens
   * @param tokenId tokenId of the token to be withdrawn
   */
    function withdraw(uint256 tokenId) public payable {
        require(ownerOf(tokenId) == msg.sender);
        _burn(msg.sender, tokenId);
        emit Withdraw(token, msg.sender, tokenId);
    }

    /**
   * @dev Overriding the inherited method so that it emits LogTransfer
   */
    function transferFrom(address from, address to, uint256 tokenId) public {
        if (
            parent != address(0x0) &&
            !IParentToken(parent).beforeTransfer(msg.sender, to, tokenId)
        ) {
            return;
        }
        _transferFrom(from, to, tokenId);
    }

    function _transferFrom(address from, address to, uint256 tokenId) internal {
        super._transferFrom(from, to, tokenId);
        emit LogTransfer(token, from, to, tokenId);
    }
}

// File: contracts/child/ChildChain.sol

pragma solidity ^0.5.2;







contract ChildChain is Ownable, StateSyncerVerifier, StateReceiver {
    // mapping for (root token => child token)
    mapping(address => address) public tokens;
    mapping(address => bool) public isERC721;
    mapping(uint256 => bool) public deposits;
    mapping(uint256 => bool) public withdraws;

    event NewToken(
        address indexed rootToken,
        address indexed token,
        uint8 _decimals
    );

    event TokenDeposited(
        address indexed rootToken,
        address indexed childToken,
        address indexed user,
        uint256 amount,
        uint256 depositCount
    );

    event TokenWithdrawn(
        address indexed rootToken,
        address indexed childToken,
        address indexed user,
        uint256 amount,
        uint256 withrawCount
    );

    constructor() public {
        //Mapping matic Token
        tokens[0x7D1AfA7B718fb893dB30A3aBc0Cfc608AaCfeBB0] = 0x0000000000000000000000000000000000001010;
    }

    function onStateReceive(
        uint256, /* id */
        bytes calldata data
    ) external onlyStateSyncer {
        (address user, address rootToken, uint256 amountOrTokenId, uint256 depositId) = abi
            .decode(data, (address, address, uint256, uint256));
        depositTokens(rootToken, user, amountOrTokenId, depositId);
    }

    function addToken(
        address _owner,
        address _rootToken,
        string memory _name,
        string memory _symbol,
        uint8 _decimals,
        bool _isERC721
    ) public onlyOwner returns (address token) {
        // check if root token already exists
        require(tokens[_rootToken] == address(0x0), "Token already mapped");

        // create new token contract
        if (_isERC721) {
            token = address(
                new ChildERC721(_owner, _rootToken, _name, _symbol)
            );
            isERC721[_rootToken] = true;
        } else {
            token = address(
                new ChildERC20(_owner, _rootToken, _name, _symbol, _decimals)
            );
        }

        // add mapping with root token
        tokens[_rootToken] = token;

        // broadcast new token's event
        emit NewToken(_rootToken, token, _decimals);
    }

    // for testnet updates remove for mainnet
    function mapToken(address rootToken, address token, bool isErc721)
        public
        onlyOwner
    {
        tokens[rootToken] = token;
        isERC721[rootToken] = isErc721;
    }

    function withdrawTokens(
        address rootToken,
        address user,
        uint256 amountOrTokenId,
        uint256 withdrawCount
    ) public onlyOwner {
        // check if withdrawal happens only once
        require(withdraws[withdrawCount] == false);

        // set withdrawal flag
        withdraws[withdrawCount] = true;

        // retrieve child tokens
        address childToken = tokens[rootToken];

        // check if child token is mapped
        require(childToken != address(0x0), "child token is not mapped");

        ChildToken obj;

        if (isERC721[rootToken]) {
            obj = ChildERC721(childToken);
        } else {
            obj = ChildERC20(childToken);
        }
        // withdraw tokens
        obj.withdraw(amountOrTokenId);

        // Emit TokenWithdrawn event
        emit TokenWithdrawn(
            rootToken,
            childToken,
            user,
            amountOrTokenId,
            withdrawCount
        );
    }

    function depositTokens(
        address rootToken,
        address user,
        uint256 amountOrTokenId,
        uint256 depositId
    ) internal {
        // check if deposit happens only once
        require(deposits[depositId] == false);

        // set deposit flag
        deposits[depositId] = true;

        // retrieve child tokens
        address childToken = tokens[rootToken];

        // check if child token is mapped
        require(childToken != address(0x0));

        ChildToken obj;

        if (isERC721[rootToken]) {
            obj = ChildERC721(childToken);
        } else {
            obj = ChildERC20(childToken);
        }

        // deposit tokens
        obj.deposit(user, amountOrTokenId);

        // Emit TokenDeposited event
        emit TokenDeposited(
            rootToken,
            childToken,
            user,
            amountOrTokenId,
            depositId
        );
    }

}

• No Contract Security Audit Submitted- Submit Audit Here

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