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• 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 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)
• library Address
•    - function isContract(address account)
•  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 ...
• library Roles
•    - function add(Role storage role, addre ...
•    - function remove(Role storage role, ad ...
•    - function has(Role storage role, addre ...
•  contract MinterRole
•    - function isMinter(address account)
•    - function addMinter(address account)
•    - function renounceMinter()
•    - function _addMinter(address account)
•    - function _removeMinter(address accoun ...
•  contract ERC721Mintable is ERC721, ...
•    - function mint(address to, uint256 tok ...
•  contract PauserRole
•    - function isPauser(address account)
•    - function addPauser(address account)
•    - function renouncePauser()
•    - function _addPauser(address account)
•    - function _removePauser(address accoun ...
•  contract Pausable is PauserRole
•    - function paused()
•    - function pause()
•    - function unpause()
•  contract ERC721Pausable is ERC721, ...
•    - function approve(address to, uint256 ...
•    - function setApprovalForAll(address to ...
•    - function transferFrom(address from, a ...
•  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 HeroAsset is ERC721Full, ...
•    - function setSupplyLimit(uint16 _heroT ...
•    - function setTokenURIPrefix(string cal ...
•    - function getSupplyLimit(uint16 _heroT ...
•    - function mintHeroAsset(address _owner ...
•    - function tokenURI(uint256 tokenId)
•  contract Ownable
•    - function owner()
•    - function isOwner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•    - function _transferOwnership(address n ...
•  contract OperatorRole is Ownable
•    - function isOperator(address account)
•    - function addOperator(address account)
•    - function removeOperator(address accou ...
• 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 Withdrawable is Ownable
•    - function withdrawEther()
•    - function withdrawToken(IERC20 _token)
•  contract ReentrancyGuard
•  contract DJTBase is Withdrawable, ...
•  contract HeroGatewayV2 is Operator ... *
•    - function transferAllTokensOfGateway(a ...
•    - function setPastEventHash(bytes32 _ev ...
•    - function setHeroAssetAddress(address ...
•    - function depositHero(uint256 _tokenId ...
•    - function withdrawHeroToAssetOwnerByAd ...
•    - function mintHero(address _assetOwner ...
•    - function onERC721Received(
•    - function checkIsPastEvent(bytes32 _ev ...
•    - function _transferHeroAsset(address _ ...
•    - function _withdrawHero(address _asset ...
•    - function _mintHero(address _assetOwne ...

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/**
 *Submitted for verification at Etherscan.io on 2019-03-01
*/

pragma solidity 0.5.4;

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/introspection/IERC165.sol

/**
 * @title IERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721.sol

/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721Receiver.sol

/**
 * @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(keccak256("onERC721Received(address,address,uint256,bytes)"))`
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data)
    public returns (bytes4);
}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/math/SafeMath.sol

/**
 * @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/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/utils/Address.sol

/**
 * 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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/introspection/ERC165.sol

/**
 * @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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721.sol

/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721 is ERC165, IERC721 {
    using SafeMath for uint256;
    using Address for address;

    // 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 => uint256) 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];
    }

    /**
     * @dev Gets the owner of the specified token ID
     * @param tokenId uint256 ID of the token to query the owner of
     * @return owner 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 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] = _ownedTokensCount[to].add(1);

        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] = _ownedTokensCount[owner].sub(1);
        _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] = _ownedTokensCount[from].sub(1);
        _ownedTokensCount[to] = _ownedTokensCount[to].add(1);

        _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 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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/access/Roles.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];
    }
}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/access/roles/MinterRole.sol

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));
        _;
    }

    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);
    }
}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Mintable.sol

/**
 * @title ERC721Mintable
 * @dev ERC721 minting logic
 */
contract ERC721Mintable is ERC721, MinterRole {
    /**
     * @dev Function to mint tokens
     * @param to The address that will receive the minted tokens.
     * @param tokenId The token id to mint.
     * @return A boolean that indicates if the operation was successful.
     */
    function mint(address to, uint256 tokenId) public onlyMinter returns (bool) {
        _mint(to, tokenId);
        return true;
    }
}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/access/roles/PauserRole.sol

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));
        _;
    }

    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);
    }
}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is PauserRole {
    event Paused(address account);
    event Unpaused(address account);

    bool private _paused;

    constructor () internal {
        _paused = false;
    }

    /**
     * @return true if the contract is paused, 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);
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused);
        _;
    }

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

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

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Pausable.sol

/**
 * @title ERC721 Non-Fungible Pausable token
 * @dev ERC721 modified with pausable transfers.
 **/
contract ERC721Pausable is ERC721, Pausable {
    function approve(address to, uint256 tokenId) public whenNotPaused {
        super.approve(to, tokenId);
    }

    function setApprovalForAll(address to, bool approved) public whenNotPaused {
        super.setApprovalForAll(to, approved);
    }

    function transferFrom(address from, address to, uint256 tokenId) public whenNotPaused {
        super.transferFrom(from, to, tokenId);
    }
}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721Enumerable.sol

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Enumerable.sol

/**
 * @title ERC-721 Non-Fungible Token with optional enumeration extension logic
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
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 ERC721 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 occcupied by
        // lasTokenId, 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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/IERC721Metadata.sol

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721Metadata.sol

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: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC721/ERC721FUll.sol

/**
 * @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://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
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/HeroAsset.sol

contract HeroAsset is ERC721Full, ERC721Mintable, ERC721Pausable {

    uint16 public constant HERO_TYPE_OFFSET = 10000;

    string public tokenURIPrefix = "https://www.mycryptoheroes.net/metadata/hero/";
    mapping(uint16 => uint16) private heroTypeToSupplyLimit;

    constructor() public ERC721Full("MyCryptoHeroes:Hero", "MCHH") {}

    function setSupplyLimit(uint16 _heroType, uint16 _supplyLimit) external onlyMinter {
        require(heroTypeToSupplyLimit[_heroType] == 0 || _supplyLimit < heroTypeToSupplyLimit[_heroType],
            "_supplyLimit is bigger");
        heroTypeToSupplyLimit[_heroType] = _supplyLimit;
    }

    function setTokenURIPrefix(string calldata _tokenURIPrefix) external onlyMinter {
        tokenURIPrefix = _tokenURIPrefix;
    }

    function getSupplyLimit(uint16 _heroType) public view returns (uint16) {
        return heroTypeToSupplyLimit[_heroType];
    }

    function mintHeroAsset(address _owner, uint256 _tokenId) public onlyMinter {
        uint16 _heroType = uint16(_tokenId / HERO_TYPE_OFFSET);
        uint16 _heroTypeIndex = uint16(_tokenId % HERO_TYPE_OFFSET) - 1;
        require(_heroTypeIndex < heroTypeToSupplyLimit[_heroType], "supply over");
        _mint(_owner, _tokenId);
    }

    function tokenURI(uint256 tokenId) public view returns (string memory) {
        bytes32 tokenIdBytes;
        if (tokenId == 0) {
            tokenIdBytes = "0";
        } else {
            uint256 value = tokenId;
            while (value > 0) {
                tokenIdBytes = bytes32(uint256(tokenIdBytes) / (2 ** 8));
                tokenIdBytes |= bytes32(((value % 10) + 48) * 2 ** (8 * 31));
                value /= 10;
            }
        }

        bytes memory prefixBytes = bytes(tokenURIPrefix);
        bytes memory tokenURIBytes = new bytes(prefixBytes.length + tokenIdBytes.length);

        uint8 i;
        uint8 index = 0;
        
        for (i = 0; i < prefixBytes.length; i++) {
            tokenURIBytes[index] = prefixBytes[i];
            index++;
        }
        
        for (i = 0; i < tokenIdBytes.length; i++) {
            tokenURIBytes[index] = tokenIdBytes[i];
            index++;
        }
        
        return string(tokenURIBytes);
    }

}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/ownership/Ownable.sol

/**
 * @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.
     * @notice Renouncing to ownership will leave the contract without an owner.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     */
    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/access/roles/OperatorRole.sol

contract OperatorRole is Ownable {
    using Roles for Roles.Role;

    event OperatorAdded(address indexed account);
    event OperatorRemoved(address indexed account);

    Roles.Role private operators;

    constructor() public {
        operators.add(msg.sender);
    }

    modifier onlyOperator() {
        require(isOperator(msg.sender));
        _;
    }
    
    function isOperator(address account) public view returns (bool) {
        return operators.has(account);
    }

    function addOperator(address account) public onlyOwner() {
        operators.add(account);
        emit OperatorAdded(account);
    }

    function removeOperator(address account) public onlyOwner() {
        operators.remove(account);
        emit OperatorRemoved(account);
    }

}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/token/ERC20/IERC20.sol

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/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: contracts/lib/github.com/contract-library/contract-library-0.0.4/contracts/ownership/Withdrawable.sol

contract Withdrawable is Ownable {
  function withdrawEther() external onlyOwner {
    msg.sender.transfer(address(this).balance);
  }

  function withdrawToken(IERC20 _token) external onlyOwner {
    require(_token.transfer(msg.sender, _token.balanceOf(address(this))));
  }
}

// File: contracts/lib/github.com/OpenZeppelin/openzeppelin-solidity-2.1.2/contracts/utils/ReentrancyGuard.sol

/**
 * @title Helps contracts guard against reentrancy attacks.
 * @author Remco Bloemen <remco@2π.com>, Eenae <[email protected]>
 * @dev If you mark a function `nonReentrant`, you should also
 * mark it `external`.
 */
contract ReentrancyGuard {
    /// @dev counter to allow mutex lock with only one SSTORE operation
    uint256 private _guardCounter;

    constructor () internal {
        // The counter starts at one to prevent changing it from zero to a non-zero
        // value, which is a more expensive operation.
        _guardCounter = 1;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and make it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _guardCounter += 1;
        uint256 localCounter = _guardCounter;
        _;
        require(localCounter == _guardCounter);
    }
}

// File: contracts/lib/github.com/contract-library/contract-library-0.0.4/contracts/DJTBase.sol

contract DJTBase is Withdrawable, Pausable, ReentrancyGuard {
    using SafeMath for uint256;
}

// File: contracts/HeroGatewayV2.sol

contract HeroGatewayV2 is OperatorRole, DJTBase {

  HeroAsset public heroAsset;

  event InComingEvent(
    address indexed locker,
    uint256 tokenId,
    uint256 at
  );

  event OutgoingEvent(
      address indexed assetOwner,
      uint256 tokenId,
      uint256 at,
      bytes32 indexed eventHash,
      uint8 eventType
  );

  uint public constant LIMIT = 10;

  mapping(bytes32 => bool) private isPastEvent;

  function transferAllTokensOfGateway(address _newAddress) external onlyOwner {
    uint256 balance = heroAsset.balanceOf(address(this));

    for (uint256 i=balance; i > 0; i--) {
      uint256 tokenId = heroAsset.tokenOfOwnerByIndex(address(this), i-1);
      _transferHeroAsset(address(this), _newAddress, tokenId);
    }
  }

  function setPastEventHash(bytes32 _eventHash, bool _desired) external onlyOperator {
    isPastEvent[_eventHash] = _desired;
  }

  function setHeroAssetAddress(address _heroAssetAddress) external onlyOwner {
    heroAsset = HeroAsset(_heroAssetAddress);
  }

  function depositHero(uint256 _tokenId) public whenNotPaused() {
    _transferHeroAsset(msg.sender, address(this), _tokenId);
    emit InComingEvent(msg.sender, _tokenId, block.timestamp);
  }

  function withdrawHeroToAssetOwnerByAdmin(address _assetOwner, uint256 _tokenId, bytes32 _eventHash) external onlyOperator {
    require(!checkIsPastEvent(_eventHash));
    _withdrawHero(_assetOwner, _tokenId, _eventHash);
    isPastEvent[_eventHash] = true;
  }

  function mintHero(address _assetOwner, uint256 _tokenId, bytes32 _eventHash) external onlyOperator {
    require(!checkIsPastEvent(_eventHash));
    _mintHero(_assetOwner, _tokenId, _eventHash);
    isPastEvent[_eventHash] = true;
  }

  function onERC721Received(
    address operator,
    address from,
    uint256 tokenId,
    bytes memory data
  )
  public
  returns(bytes4) { 
    return 0x150b7a02;
  }

  function checkIsPastEvent(bytes32 _eventHash) public view returns (bool) {
    return isPastEvent[_eventHash];
  }
  
  function _transferHeroAsset(address _from, address _to, uint256 _tokenId) private {
    heroAsset.safeTransferFrom(
      _from,
      _to,
      _tokenId
    );
  }

  function _withdrawHero(address _assetOwner, uint256 _tokenId, bytes32 _eventHash) private {
    _transferHeroAsset(address(this), _assetOwner, _tokenId);
    emit OutgoingEvent(_assetOwner, _tokenId, block.timestamp, _eventHash, 1);
  }

  function _mintHero(address _assetOwner, uint256 _tokenId, bytes32 _eventHash) private {
    heroAsset.mintHeroAsset(_assetOwner, _tokenId);
    emit OutgoingEvent(_assetOwner, _tokenId, block.timestamp, _eventHash, 0);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":false,"inputs":[{"name":"_assetOwner","type":"address"},{"name":"_tokenId","type":"uint256"},{"name":"_eventHash","type":"bytes32"}],"name":"mintHero","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newAddress","type":"address"}],"name":"transferAllTokensOfGateway","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"operator","type":"address"},{"name":"from","type":"address"},{"name":"tokenId","type":"uint256"},{"name":"data","type":"bytes"}],"name":"onERC721Received","outputs":[{"name":"","type":"bytes4"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"heroAsset","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_eventHash","type":"bytes32"}],"name":"checkIsPastEvent","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"isPauser","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"account","type":"address"}],"name":"isOperator","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renouncePauser","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdrawEther","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"account","type":"address"}],"name":"addPauser","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_token","type":"address"}],"name":"withdrawToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_heroAssetAddress","type":"address"}],"name":"setHeroAssetAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"account","type":"address"}],"name":"addOperator","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"depositHero","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"account","type":"address"}],"name":"removeOperator","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"LIMIT","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_eventHash","type":"bytes32"},{"name":"_desired","type":"bool"}],"name":"setPastEventHash","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_assetOwner","type":"address"},{"name":"_tokenId","type":"uint256"},{"name":"_eventHash","type":"bytes32"}],"name":"withdrawHeroToAssetOwnerByAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"locker","type":"address"},{"indexed":false,"name":"tokenId","type":"uint256"},{"indexed":false,"name":"at","type":"uint256"}],"name":"InComingEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"assetOwner","type":"address"},{"indexed":false,"name":"tokenId","type":"uint256"},{"indexed":false,"name":"at","type":"uint256"},{"indexed":true,"name":"eventHash","type":"bytes32"},{"indexed":false,"name":"eventType","type":"uint8"}],"name":"OutgoingEvent","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"account","type":"address"}],"name":"PauserAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"account","type":"address"}],"name":"PauserRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"account","type":"address"}],"name":"OperatorAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"account","type":"address"}],"name":"OperatorRemoved","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

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