Contract 0xc5F572B705cAE1893CdcEB5161ce40e2fC5bB6cD

 
 
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0xda59267ff1ccdc5e52ff312d238d4aee1bf5e7d4359caa7400501d47bc95aea4Set Approval For...163713402023-01-09 19:29:2318 days 18 hrs ago0x61524303810f8bdd61aef58af39355aa353dedd2 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00123942 26.64222001
0xd4ef8510317faf7e43b9b68467bfa8d79b39571bc60f443096df8ae9f8090bf2Set Approval For...163685502023-01-09 10:09:1119 days 3 hrs agoENS Name saloschin.eth IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00081609 17.54244556
0x6f01fc97a60242e9d476412cd1e67793dbafa282deb736a2fe9eca8c6e55b198Set Approval For...163675462023-01-09 6:47:5919 days 6 hrs ago0xbd746ab0318da8682a96c40e87a28f6d1f0048d1 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00074012 15.90940486
0xa37fe199261764e6bb6253723f0ef2bf234c025ad3f073cff535553f2367f425Set Approval For...163669722023-01-09 4:52:2319 days 8 hrs ago0x4e51a06e4643197e1be2f050b6af60f9ad3cef06 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.0007595 16.32597166
0x8a1362a591a4f20b2f5eba2b89acf513ca5f3a101c51e6274f6371dbf082eefdSet Approval For...163148322023-01-01 22:13:5926 days 15 hrs agovEmpire DDAO: Deployer IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00077978 16.7619081
0x2c9b02735a624a8c2231d1565747e5e81b21e9bafbbd62ebee4c89a828e64784Safe Transfer Fr...162610082022-12-25 9:56:3534 days 3 hrs ago0xeaecf21b67dc32931cd00b7e563e893d1cde85c8 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00077086 13.89721157
0xcc4f9789079648c4f0630394a90f13e0c79c11049e10686639881630acfba0aeSet Approval For...162607812022-12-25 9:11:1134 days 4 hrs ago0xeaecf21b67dc32931cd00b7e563e893d1cde85c8 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00063096 13.56304523
0x2f9e45af49bedff338a8c433e641ca77ff248acb64b2375eca893e61fcea9ccfSet Approval For...162046832022-12-17 13:21:4742 days 17 mins agoENS Name totoevd.eth IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00074265 15.96392971
0x6119c4d76ba94d1479f2459d23ff9c9616ecea838ca242ac4898246a7caeaa7fSet Approval For...161870092022-12-15 2:07:3544 days 11 hrs ago0x3bd6f082a05655e9dfd3ce9cce4c05daf7d634dc IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00068388 14.70049221
0xba4d1f5792b80ee860c58b6d24fef1fb1b34eb0bdc616df535e2bac55b7e839eSafe Transfer Fr...161868582022-12-15 1:37:1144 days 12 hrs ago0x109752f48f8e8e5a96ccde8b1a245cc4a4aa8635 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00063222 11.44162506
0xeefd10286f0729c65fc8733911e523d220211406372b519aedc0f3eca89a74eaSafe Transfer Fr...161867182022-12-15 1:08:5944 days 12 hrs ago0x7f3f0dabbcc190d3994c6d8c0a9fe94205ad779e IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00068527 12.40157362
0x013b853d671a80d6d2e1836faa8dd63cc288a846e41ba9b28e38006a87d9c607Set Approval For...161783672022-12-13 21:09:3545 days 16 hrs ago0xc5c5b53438a7fc9cddea4f0ded2d12fbf75b6c76 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00071029 15.26820597
0xbac491bebad836a92f5c1e998953755ffdbc1ec97fe348efe43892991e157354Safe Transfer Fr...161686802022-12-12 12:39:1147 days 59 mins ago0x37e06ba4b0403d33bbabafd63662b1f0fbfdf2cd IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00078393 14.14098521
0x48df460d6e3051d737bed2d54de6baf08eb1777f82989d86f7616ab0217814f2Set Approval For...161333002022-12-07 14:03:5951 days 23 hrs ago0x37e06ba4b0403d33bbabafd63662b1f0fbfdf2cd IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00066985 14.39893189
0x7a2b8863467aca1eb94dfb14c0be944774c24993b754fa27545c94f1470e6bf1Set Approval For...159982482022-11-18 16:59:2370 days 20 hrs ago0x67557095bad5dca7499ee7b40a71e030fe511322 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00094076 20.18588084
0x62ffc9a3182cfbfc1729c990f99d96bab4267d7526df3c5fb31ffd5560d8952bSet Approval For...158196442022-10-24 18:09:4795 days 19 hrs agoENS Name arbdegen.eth IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00258247 55.51204402
0xda1ef5fb1d66674d66078f3ef3c32c53c38845e1f1464b6d17bbc841eb016dfeSet Approval For...158065062022-10-22 22:03:2397 days 15 hrs ago0x9824697f7c12cabada9b57842060931c48dea969 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.0007443316
0xa99bd4b4828f882eabd6a56bec9b57362ff2308dccaa910d06fc1959a4726356Set Approval For...157478012022-10-14 17:20:35105 days 20 hrs ago0xee7c5c1d372d39956801836433afb307fc8d4c21 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00161114 34.57027859
0x9628b3dffb1f38589b493d9ceec90bdd391768d24735bfdbfec04ff33e03a888Set Approval For...157478002022-10-14 17:20:23105 days 20 hrs ago0xee7c5c1d372d39956801836433afb307fc8d4c21 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00166783 35.85122578
0xb3e977ea6a720fa14c2250bb727604277c2753ff3e22dc5abb2bec918342b1edSet Approval For...156897152022-10-06 14:40:11113 days 22 hrs ago0xfd43dd630d0d9f335bd24d4ba636f9c4ad411d02 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00093259 20.04675401
0x80966ed9b7a220fbb2123cd517c8c1363ec393ddbb72facee2aeb5780dd371a6Safe Transfer Fr...155686032022-09-19 15:58:59130 days 21 hrs agoENS Name orphi.eth IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.0013261624
0xb1949ec0ad70d0f1824d45a3272d66f83f82d61501c87c83256268797abbbd64Safe Transfer Fr...155114722022-09-10 23:05:23139 days 14 hrs ago0x0fcbb74b8142e756b77e4abbb5e9381737058511 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00221492 40.00000001
0xafcce28ddd8d9a0655ec8bed61509683723277dbd9ea852b54fdd7f3b4335661Safe Transfer Fr...154995182022-09-08 23:45:36141 days 13 hrs ago0x58bb53c1a645637107581893a029be3df1fe49f3 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.0012321 22.24624692
0xb753fce00ab677808dfffe6ec715c38dab8ce177ea2e90652fd423d1bcc56e2fSet Approval For...154359302022-08-29 19:28:54151 days 18 hrs ago0xc5f16770dcc9ce6e6f2e02f7afdc101b28926308 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00128522 27.62674429
0x561f5f5d4eaf19cac49149a78769ac9352c0d5f5d0533c704b1e63c23466ac16Safe Transfer Fr...154119842022-08-25 23:29:29155 days 14 hrs ago0xbf95117477d5cef81ec4d569a8169376d2066d13 IN  0xc5f572b705cae1893cdceb5161ce40e2fc5bb6cd0 Ether0.00052098 9.40653962
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Contract Source Code Verified (Exact Match)

Contract Name:
StakeDaoNFT_V2

Compiler Version
v0.5.17+commit.d19bba13

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 8 : StakeDaoNFT_V2.sol
//SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/ownership/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/GSN/Context.sol";
import "./ERC1155Tradable.sol";

/**
 * @title StrategyRole
 * @dev Owner is responsible to add/remove strategy
 */
contract StrategyRole is Context, Ownable {
    using Roles for Roles.Role;

    event StrategyAdded(address indexed account);
    event StrategyRemoved(address indexed account);

    Roles.Role private _strategies;

    modifier onlyStrategy() {
        require(
            isStrategy(_msgSender()),
            "StrategyRole: caller does not have the Strategy role"
        );
        _;
    }

    function isStrategy(address account) public view returns (bool) {
        return _strategies.has(account);
    }

    function addStrategy(address account) public onlyOwner {
        _addStrategy(account);
    }

    function removeStrategy(address account) public onlyOwner {
        _removeStrategy(account);
    }

    function _addStrategy(address account) internal {
        _strategies.add(account);
        emit StrategyAdded(account);
    }

    function _removeStrategy(address account) internal {
        _strategies.remove(account);
        emit StrategyRemoved(account);
    }
}

/**
 * @title Strategy Access NFT Contract for StakeDAO
 * @dev The contract keeps a count of NFTs being used in some strategy for
 *      for each user and allows transfers based on that.
 */
contract StakeDaoNFT_V2 is ERC1155Tradable, StrategyRole {
    using SafeMath for uint256;

    event StartedUsingNFT(
        address indexed account,
        uint256 indexed id,
        address indexed strategy
    );
    event EndedUsingNFT(
        address indexed account,
        uint256 indexed id,
        address indexed strategy
    );

    // mapping account => nftId => useCount
    // this is used to restrict transfers if nft is being used in any strategy
    mapping(address => mapping(uint256 => uint256)) internal totalUseCount;

    // mapping account => nftId => strategyAddress => useCount
    // this is used to make sure a strategy can only end using nft that it started using before
    mapping(address => mapping(uint256 => mapping(address => uint256)))
        internal stratUseCount;

    // TODO: proper name, metadata uri
    constructor(address _proxyRegistryAddress)
        public
        ERC1155Tradable("Stake DAO NFT", "sdNFT", _proxyRegistryAddress)
    {
        _setBaseMetadataURI(
            "https://gateway.pinata.cloud/ipfs/QmS2txkRpQUX3XhMHjYNem8iCoPhPekYcjbwamT2NDCkH1/metadata/"
        );

        // starting ids for these nfts from 223
        // since 222 nfts (tempest, pythia) have been minted using old implementation
        _currentTokenID = 222;
    }

    function contractURI() public view returns (string memory) {
        return
            "https://gateway.pinata.cloud/ipfs/Qmc1i37KPdg7Cp8rzjgp3QoCECaEbfoSymCpKG8hF85ENv";
    }

    function getTotalUseCount(address _account, uint256 _id)
        public
        view
        returns (uint256)
    {
        return totalUseCount[_account][_id];
    }

    function getStratUseCount(
        address _account,
        uint256 _id,
        address _strategy
    ) public view returns (uint256) {
        return stratUseCount[_account][_id][_strategy];
    }

    /**
     * @notice Mark NFT as being used. Only callable by registered strategies
     * @param _account  User account address
     * @param _id       ID of the token type
     */
    function startUsingNFT(address _account, uint256 _id) public onlyStrategy {
        require(
            balances[_account][_id] > 0,
            "StakeDaoNFT_V2: user account doesnt have NFT"
        );
        stratUseCount[_account][_id][msg.sender] = stratUseCount[_account][_id][
            msg.sender
        ].add(1);
        totalUseCount[_account][_id] = totalUseCount[_account][_id].add(1);
        emit StartedUsingNFT(_account, _id, msg.sender);
    }

    /**
     * @notice Unmark NFT as being used. Only callable by registered strategies
     * @param _account  User account address
     * @param _id       ID of the token type
     */
    function endUsingNFT(address _account, uint256 _id) public onlyStrategy {
        // if a strategy tries to call endUsingNFT function for which it did not call
        // startUsingNFT then subtraction reverts due to safemath.
        stratUseCount[_account][_id][msg.sender] = stratUseCount[_account][_id][
            msg.sender
        ].sub(1);
        totalUseCount[_account][_id] = totalUseCount[_account][_id].sub(1);
        emit EndedUsingNFT(_account, _id, msg.sender);
    }

    /**
     * @dev Overrides safeTransferFrom function of ERC1155 to introduce totalUseCount check
     */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes memory _data
    ) public {
        // check if nft is being used
        require(
            totalUseCount[_from][_id] == 0,
            "StakeDaoNFT_V2: NFT being used in strategy"
        );
        super.safeTransferFrom(_from, _to, _id, _amount, _data);
    }

    /**
     * @dev Overrides safeBatchTransferFrom function of ERC1155 to introduce totalUseCount check
     */
    function safeBatchTransferFrom(
        address _from,
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) public {
        // Number of transfer to execute
        uint256 nTransfer = _ids.length;

        // check if any nft is being used
        for (uint256 i = 0; i < nTransfer; i++) {
            require(
                totalUseCount[_from][_ids[i]] == 0,
                "StakeDaoNFT_V2: NFT being used in strategy"
            );
        }

        super.safeBatchTransferFrom(_from, _to, _ids, _amounts, _data);
    }

    function burn(
        address _from,
        uint256 _id,
        uint256 _amount
    ) public onlyOwner {
        // check if nft is being used
        require(
            totalUseCount[_from][_id] == 0,
            "StakeDaoNFT_V2: NFT being used in strategy"
        );
        super.burn(_from, _id, _amount);
    }
}

File 2 of 8 : Ownable.sol
pragma solidity ^0.5.0;

import "../GSN/Context.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(isOwner(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return _msgSender() == _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: 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 Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

File 3 of 8 : SafeMath.sol
pragma solidity ^0.5.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

File 4 of 8 : Context.sol
pragma solidity ^0.5.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

File 5 of 8 : ERC1155Tradable.sol
//SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/math/Math.sol";
import "@openzeppelin/contracts/GSN/Context.sol";
import "@openzeppelin/contracts/ownership/Ownable.sol";
import "@openzeppelin/contracts/math/SafeMath.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/Address.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(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

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

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

contract MinterRole is Context {
    using Roles for Roles.Role;

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

    Roles.Role private _minters;

    constructor() internal {
        _addMinter(_msgSender());
    }

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

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

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

    function renounceMinter() public {
        _removeMinter(_msgSender());
    }

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

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

/**
 * @title WhitelistAdminRole
 * @dev WhitelistAdmins are responsible for assigning and removing Whitelisted accounts.
 */
contract WhitelistAdminRole is Context {
    using Roles for Roles.Role;

    event WhitelistAdminAdded(address indexed account);
    event WhitelistAdminRemoved(address indexed account);

    Roles.Role private _whitelistAdmins;

    constructor() internal {
        _addWhitelistAdmin(_msgSender());
    }

    modifier onlyWhitelistAdmin() {
        require(
            isWhitelistAdmin(_msgSender()),
            "WhitelistAdminRole: caller does not have the WhitelistAdmin role"
        );
        _;
    }

    function isWhitelistAdmin(address account) public view returns (bool) {
        return _whitelistAdmins.has(account);
    }

    function addWhitelistAdmin(address account) public onlyWhitelistAdmin {
        _addWhitelistAdmin(account);
    }

    function renounceWhitelistAdmin() public {
        _removeWhitelistAdmin(_msgSender());
    }

    function _addWhitelistAdmin(address account) internal {
        _whitelistAdmins.add(account);
        emit WhitelistAdminAdded(account);
    }

    function _removeWhitelistAdmin(address account) internal {
        _whitelistAdmins.remove(account);
        emit WhitelistAdminRemoved(account);
    }
}

/**
 * @title ERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
interface IERC165 {
    /**
     * @notice Query if a contract implements an interface
     * @dev Interface identification is specified in ERC-165. This function
     * uses less than 30,000 gas
     * @param _interfaceId The interface identifier, as specified in ERC-165
     */
    function supportsInterface(bytes4 _interfaceId)
        external
        view
        returns (bool);
}

/**
 * @dev ERC-1155 interface for accepting safe transfers.
 */
interface IERC1155TokenReceiver {
    /**
     * @notice Handle the receipt of a single ERC1155 token type
     * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeTransferFrom` after the balance has been updated
     * This function MAY throw to revert and reject the transfer
     * Return of other amount than the magic value MUST result in the transaction being reverted
     * Note: The token contract address is always the message sender
     * @param _operator  The address which called the `safeTransferFrom` function
     * @param _from      The address which previously owned the token
     * @param _id        The id of the token being transferred
     * @param _amount    The amount of tokens being transferred
     * @param _data      Additional data with no specified format
     * @return           `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     */
    function onERC1155Received(
        address _operator,
        address _from,
        uint256 _id,
        uint256 _amount,
        bytes calldata _data
    ) external returns (bytes4);

    /**
     * @notice Handle the receipt of multiple ERC1155 token types
     * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeBatchTransferFrom` after the balances have been updated
     * This function MAY throw to revert and reject the transfer
     * Return of other amount than the magic value WILL result in the transaction being reverted
     * Note: The token contract address is always the message sender
     * @param _operator  The address which called the `safeBatchTransferFrom` function
     * @param _from      The address which previously owned the token
     * @param _ids       An array containing ids of each token being transferred
     * @param _amounts   An array containing amounts of each token being transferred
     * @param _data      Additional data with no specified format
     * @return           `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     */
    function onERC1155BatchReceived(
        address _operator,
        address _from,
        uint256[] calldata _ids,
        uint256[] calldata _amounts,
        bytes calldata _data
    ) external returns (bytes4);

    /**
     * @notice Indicates whether a contract implements the `ERC1155TokenReceiver` functions and so can accept ERC1155 token types.
     * @param  interfaceID The ERC-165 interface ID that is queried for support.s
     * @dev This function MUST return true if it implements the ERC1155TokenReceiver interface and ERC-165 interface.
     *      This function MUST NOT consume more than 5,000 gas.
     * @return Wheter ERC-165 or ERC1155TokenReceiver interfaces are supported.
     */
    function supportsInterface(bytes4 interfaceID) external view returns (bool);
}

interface IERC1155 {
    // Events

    /**
     * @dev Either TransferSingle or TransferBatch MUST emit when tokens are transferred, including zero amount transfers as well as minting or burning
     *   Operator MUST be msg.sender
     *   When minting/creating tokens, the `_from` field MUST be set to `0x0`
     *   When burning/destroying tokens, the `_to` field MUST be set to `0x0`
     *   The total amount transferred from address 0x0 minus the total amount transferred to 0x0 may be used by clients and exchanges to be added to the "circulating supply" for a given token ID
     *   To broadcast the existence of a token ID with no initial balance, the contract SHOULD emit the TransferSingle event from `0x0` to `0x0`, with the token creator as `_operator`, and a `_amount` of 0
     */
    event TransferSingle(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256 _id,
        uint256 _amount
    );

    /**
     * @dev Either TransferSingle or TransferBatch MUST emit when tokens are transferred, including zero amount transfers as well as minting or burning
     *   Operator MUST be msg.sender
     *   When minting/creating tokens, the `_from` field MUST be set to `0x0`
     *   When burning/destroying tokens, the `_to` field MUST be set to `0x0`
     *   The total amount transferred from address 0x0 minus the total amount transferred to 0x0 may be used by clients and exchanges to be added to the "circulating supply" for a given token ID
     *   To broadcast the existence of multiple token IDs with no initial balance, this SHOULD emit the TransferBatch event from `0x0` to `0x0`, with the token creator as `_operator`, and a `_amount` of 0
     */
    event TransferBatch(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256[] _ids,
        uint256[] _amounts
    );

    /**
     * @dev MUST emit when an approval is updated
     */
    event ApprovalForAll(
        address indexed _owner,
        address indexed _operator,
        bool _approved
    );

    /**
     * @dev MUST emit when the URI is updated for a token ID
     *   URIs are defined in RFC 3986
     *   The URI MUST point a JSON file that conforms to the "ERC-1155 Metadata JSON Schema"
     */
    event URI(string _amount, uint256 indexed _id);

    /**
     * @notice Transfers amount of an _id from the _from address to the _to address specified
     * @dev MUST emit TransferSingle event on success
     * Caller must be approved to manage the _from account's tokens (see isApprovedForAll)
     * MUST throw if `_to` is the zero address
     * MUST throw if balance of sender for token `_id` is lower than the `_amount` sent
     * MUST throw on any other error
     * When transfer is complete, this function MUST check if `_to` is a smart contract (code size > 0). If so, it MUST call `onERC1155Received` on `_to` and revert if the return amount is not `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * @param _from    Source address
     * @param _to      Target address
     * @param _id      ID of the token type
     * @param _amount  Transfered amount
     * @param _data    Additional data with no specified format, sent in call to `_to`
     */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes calldata _data
    ) external;

    /**
     * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call)
     * @dev MUST emit TransferBatch event on success
     * Caller must be approved to manage the _from account's tokens (see isApprovedForAll)
     * MUST throw if `_to` is the zero address
     * MUST throw if length of `_ids` is not the same as length of `_amounts`
     * MUST throw if any of the balance of sender for token `_ids` is lower than the respective `_amounts` sent
     * MUST throw on any other error
     * When transfer is complete, this function MUST check if `_to` is a smart contract (code size > 0). If so, it MUST call `onERC1155BatchReceived` on `_to` and revert if the return amount is not `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * Transfers and events MUST occur in the array order they were submitted (_ids[0] before _ids[1], etc)
     * @param _from     Source addresses
     * @param _to       Target addresses
     * @param _ids      IDs of each token type
     * @param _amounts  Transfer amounts per token type
     * @param _data     Additional data with no specified format, sent in call to `_to`
     */
    function safeBatchTransferFrom(
        address _from,
        address _to,
        uint256[] calldata _ids,
        uint256[] calldata _amounts,
        bytes calldata _data
    ) external;

    /**
     * @notice Get the balance of an account's Tokens
     * @param _owner  The address of the token holder
     * @param _id     ID of the Token
     * @return        The _owner's balance of the Token type requested
     */
    function balanceOf(address _owner, uint256 _id)
        external
        view
        returns (uint256);

    /**
     * @notice Get the balance of multiple account/token pairs
     * @param _owners The addresses of the token holders
     * @param _ids    ID of the Tokens
     * @return        The _owner's balance of the Token types requested (i.e. balance for each (owner, id) pair)
     */
    function balanceOfBatch(address[] calldata _owners, uint256[] calldata _ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @notice Enable or disable approval for a third party ("operator") to manage all of caller's tokens
     * @dev MUST emit the ApprovalForAll event on success
     * @param _operator  Address to add to the set of authorized operators
     * @param _approved  True if the operator is approved, false to revoke approval
     */
    function setApprovalForAll(address _operator, bool _approved) external;

    /**
     * @notice Queries the approval status of an operator for a given owner
     * @param _owner     The owner of the Tokens
     * @param _operator  Address of authorized operator
     * @return           True if the operator is approved, false if not
     */
    function isApprovedForAll(address _owner, address _operator)
        external
        view
        returns (bool isOperator);
}

/**
 * @dev Implementation of Multi-Token Standard contract
 */
contract ERC1155 is IERC165 {
    using SafeMath for uint256;
    using Address for address;

    /***********************************|
  |        Variables and Events       |
  |__________________________________*/

    // onReceive function signatures
    bytes4 internal constant ERC1155_RECEIVED_VALUE = 0xf23a6e61;
    bytes4 internal constant ERC1155_BATCH_RECEIVED_VALUE = 0xbc197c81;

    // Objects balances
    mapping(address => mapping(uint256 => uint256)) internal balances;

    // Operator Functions
    mapping(address => mapping(address => bool)) internal operators;

    // Events
    event TransferSingle(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256 _id,
        uint256 _amount
    );
    event TransferBatch(
        address indexed _operator,
        address indexed _from,
        address indexed _to,
        uint256[] _ids,
        uint256[] _amounts
    );
    event ApprovalForAll(
        address indexed _owner,
        address indexed _operator,
        bool _approved
    );
    event URI(string _uri, uint256 indexed _id);

    /***********************************|
  |     Public Transfer Functions     |
  |__________________________________*/

    /**
     * @notice Transfers amount amount of an _id from the _from address to the _to address specified
     * @param _from    Source address
     * @param _to      Target address
     * @param _id      ID of the token type
     * @param _amount  Transfered amount
     * @param _data    Additional data with no specified format, sent in call to `_to`
     */
    function safeTransferFrom(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes memory _data
    ) public {
        require(
            (msg.sender == _from) || isApprovedForAll(_from, msg.sender),
            "ERC1155#safeTransferFrom: INVALID_OPERATOR"
        );
        require(
            _to != address(0),
            "ERC1155#safeTransferFrom: INVALID_RECIPIENT"
        );
        // require(_amount >= balances[_from][_id]) is not necessary since checked with safemath operations

        _safeTransferFrom(_from, _to, _id, _amount);
        _callonERC1155Received(_from, _to, _id, _amount, _data);
    }

    /**
     * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call)
     * @param _from     Source addresses
     * @param _to       Target addresses
     * @param _ids      IDs of each token type
     * @param _amounts  Transfer amounts per token type
     * @param _data     Additional data with no specified format, sent in call to `_to`
     */
    function safeBatchTransferFrom(
        address _from,
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) public {
        // Requirements
        require(
            (msg.sender == _from) || isApprovedForAll(_from, msg.sender),
            "ERC1155#safeBatchTransferFrom: INVALID_OPERATOR"
        );
        require(
            _to != address(0),
            "ERC1155#safeBatchTransferFrom: INVALID_RECIPIENT"
        );

        _safeBatchTransferFrom(_from, _to, _ids, _amounts);
        _callonERC1155BatchReceived(_from, _to, _ids, _amounts, _data);
    }

    /***********************************|
  |    Internal Transfer Functions    |
  |__________________________________*/

    /**
     * @notice Transfers amount amount of an _id from the _from address to the _to address specified
     * @param _from    Source address
     * @param _to      Target address
     * @param _id      ID of the token type
     * @param _amount  Transfered amount
     */
    function _safeTransferFrom(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount
    ) internal {
        // Update balances
        balances[_from][_id] = balances[_from][_id].sub(_amount); // Subtract amount
        balances[_to][_id] = balances[_to][_id].add(_amount); // Add amount

        // Emit event
        emit TransferSingle(msg.sender, _from, _to, _id, _amount);
    }

    /**
     * @notice Verifies if receiver is contract and if so, calls (_to).onERC1155Received(...)
     */
    function _callonERC1155Received(
        address _from,
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes memory _data
    ) internal {
        // Check if recipient is contract
        if (_to.isContract()) {
            bytes4 retval = IERC1155TokenReceiver(_to).onERC1155Received(
                msg.sender,
                _from,
                _id,
                _amount,
                _data
            );
            require(
                retval == ERC1155_RECEIVED_VALUE,
                "ERC1155#_callonERC1155Received: INVALID_ON_RECEIVE_MESSAGE"
            );
        }
    }

    /**
     * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call)
     * @param _from     Source addresses
     * @param _to       Target addresses
     * @param _ids      IDs of each token type
     * @param _amounts  Transfer amounts per token type
     */
    function _safeBatchTransferFrom(
        address _from,
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts
    ) internal {
        require(
            _ids.length == _amounts.length,
            "ERC1155#_safeBatchTransferFrom: INVALID_ARRAYS_LENGTH"
        );

        // Number of transfer to execute
        uint256 nTransfer = _ids.length;

        // Executing all transfers
        for (uint256 i = 0; i < nTransfer; i++) {
            // Update storage balance of previous bin
            balances[_from][_ids[i]] = balances[_from][_ids[i]].sub(
                _amounts[i]
            );
            balances[_to][_ids[i]] = balances[_to][_ids[i]].add(_amounts[i]);
        }

        // Emit event
        emit TransferBatch(msg.sender, _from, _to, _ids, _amounts);
    }

    /**
     * @notice Verifies if receiver is contract and if so, calls (_to).onERC1155BatchReceived(...)
     */
    function _callonERC1155BatchReceived(
        address _from,
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) internal {
        // Pass data if recipient is contract
        if (_to.isContract()) {
            bytes4 retval = IERC1155TokenReceiver(_to).onERC1155BatchReceived(
                msg.sender,
                _from,
                _ids,
                _amounts,
                _data
            );
            require(
                retval == ERC1155_BATCH_RECEIVED_VALUE,
                "ERC1155#_callonERC1155BatchReceived: INVALID_ON_RECEIVE_MESSAGE"
            );
        }
    }

    /***********************************|
  |         Operator Functions        |
  |__________________________________*/

    /**
     * @notice Enable or disable approval for a third party ("operator") to manage all of caller's tokens
     * @param _operator  Address to add to the set of authorized operators
     * @param _approved  True if the operator is approved, false to revoke approval
     */
    function setApprovalForAll(address _operator, bool _approved) external {
        // Update operator status
        operators[msg.sender][_operator] = _approved;
        emit ApprovalForAll(msg.sender, _operator, _approved);
    }

    /**
     * @notice Queries the approval status of an operator for a given owner
     * @param _owner     The owner of the Tokens
     * @param _operator  Address of authorized operator
     * @return True if the operator is approved, false if not
     */
    function isApprovedForAll(address _owner, address _operator)
        public
        view
        returns (bool isOperator)
    {
        return operators[_owner][_operator];
    }

    /***********************************|
  |         Balance Functions         |
  |__________________________________*/

    /**
     * @notice Get the balance of an account's Tokens
     * @param _owner  The address of the token holder
     * @param _id     ID of the Token
     * @return The _owner's balance of the Token type requested
     */
    function balanceOf(address _owner, uint256 _id)
        public
        view
        returns (uint256)
    {
        return balances[_owner][_id];
    }

    /**
     * @notice Get the balance of multiple account/token pairs
     * @param _owners The addresses of the token holders
     * @param _ids    ID of the Tokens
     * @return        The _owner's balance of the Token types requested (i.e. balance for each (owner, id) pair)
     */
    function balanceOfBatch(address[] memory _owners, uint256[] memory _ids)
        public
        view
        returns (uint256[] memory)
    {
        require(
            _owners.length == _ids.length,
            "ERC1155#balanceOfBatch: INVALID_ARRAY_LENGTH"
        );

        // Variables
        uint256[] memory batchBalances = new uint256[](_owners.length);

        // Iterate over each owner and token ID
        for (uint256 i = 0; i < _owners.length; i++) {
            batchBalances[i] = balances[_owners[i]][_ids[i]];
        }

        return batchBalances;
    }

    /***********************************|
  |          ERC165 Functions         |
  |__________________________________*/

    /**
     * INTERFACE_SIGNATURE_ERC165 = bytes4(keccak256("supportsInterface(bytes4)"));
     */
    bytes4 private constant INTERFACE_SIGNATURE_ERC165 = 0x01ffc9a7;

    /**
     * INTERFACE_SIGNATURE_ERC1155 =
     * bytes4(keccak256("safeTransferFrom(address,address,uint256,uint256,bytes)")) ^
     * bytes4(keccak256("safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)")) ^
     * bytes4(keccak256("balanceOf(address,uint256)")) ^
     * bytes4(keccak256("balanceOfBatch(address[],uint256[])")) ^
     * bytes4(keccak256("setApprovalForAll(address,bool)")) ^
     * bytes4(keccak256("isApprovedForAll(address,address)"));
     */
    bytes4 private constant INTERFACE_SIGNATURE_ERC1155 = 0xd9b67a26;

    /**
     * @notice Query if a contract implements an interface
     * @param _interfaceID  The interface identifier, as specified in ERC-165
     * @return `true` if the contract implements `_interfaceID` and
     */
    function supportsInterface(bytes4 _interfaceID)
        external
        view
        returns (bool)
    {
        if (
            _interfaceID == INTERFACE_SIGNATURE_ERC165 ||
            _interfaceID == INTERFACE_SIGNATURE_ERC1155
        ) {
            return true;
        }
        return false;
    }
}

/**
 * @notice Contract that handles metadata related methods.
 * @dev Methods assume a deterministic generation of URI based on token IDs.
 *      Methods also assume that URI uses hex representation of token IDs.
 */
contract ERC1155Metadata {
    // URI's default URI prefix
    string internal baseMetadataURI;
    event URI(string _uri, uint256 indexed _id);

    /***********************************|
  |     Metadata Public Function s    |
  |__________________________________*/

    /**
     * @notice A distinct Uniform Resource Identifier (URI) for a given token.
     * @dev URIs are defined in RFC 3986.
     *      URIs are assumed to be deterministically generated based on token ID
     *      Token IDs are assumed to be represented in their hex format in URIs
     * @return URI string
     */
    function uri(uint256 _id) public view returns (string memory) {
        return
            string(abi.encodePacked(baseMetadataURI, _uint2str(_id), ".json"));
    }

    /***********************************|
  |    Metadata Internal Functions    |
  |__________________________________*/

    /**
     * @notice Will emit default URI log event for corresponding token _id
     * @param _tokenIDs Array of IDs of tokens to log default URI
     */
    function _logURIs(uint256[] memory _tokenIDs) internal {
        string memory baseURL = baseMetadataURI;
        string memory tokenURI;

        for (uint256 i = 0; i < _tokenIDs.length; i++) {
            tokenURI = string(
                abi.encodePacked(baseURL, _uint2str(_tokenIDs[i]), ".json")
            );
            emit URI(tokenURI, _tokenIDs[i]);
        }
    }

    /**
     * @notice Will emit a specific URI log event for corresponding token
     * @param _tokenIDs IDs of the token corresponding to the _uris logged
     * @param _URIs    The URIs of the specified _tokenIDs
     */
    function _logURIs(uint256[] memory _tokenIDs, string[] memory _URIs)
        internal
    {
        require(
            _tokenIDs.length == _URIs.length,
            "ERC1155Metadata#_logURIs: INVALID_ARRAYS_LENGTH"
        );
        for (uint256 i = 0; i < _tokenIDs.length; i++) {
            emit URI(_URIs[i], _tokenIDs[i]);
        }
    }

    /**
     * @notice Will update the base URL of token's URI
     * @param _newBaseMetadataURI New base URL of token's URI
     */
    function _setBaseMetadataURI(string memory _newBaseMetadataURI) internal {
        baseMetadataURI = _newBaseMetadataURI;
    }

    /***********************************|
  |    Utility Internal Functions     |
  |__________________________________*/

    /**
     * @notice Convert uint256 to string
     * @param _i Unsigned integer to convert to string
     */
    function _uint2str(uint256 _i)
        internal
        pure
        returns (string memory _uintAsString)
    {
        if (_i == 0) {
            return "0";
        }

        uint256 j = _i;
        uint256 ii = _i;
        uint256 len;

        // Get number of bytes
        while (j != 0) {
            len++;
            j /= 10;
        }

        bytes memory bstr = new bytes(len);
        uint256 k = len - 1;

        // Get each individual ASCII
        while (ii != 0) {
            bstr[k--] = bytes1(uint8(48 + (ii % 10)));
            ii /= 10;
        }

        // Convert to string
        return string(bstr);
    }
}

/**
 * @dev Multi-Fungible Tokens with minting and burning methods. These methods assume
 *      a parent contract to be executed as they are `internal` functions
 */
contract ERC1155MintBurn is ERC1155 {
    /****************************************|
  |            Minting Functions           |
  |_______________________________________*/

    /**
     * @notice Mint _amount of tokens of a given id
     * @param _to      The address to mint tokens to
     * @param _id      Token id to mint
     * @param _amount  The amount to be minted
     * @param _data    Data to pass if receiver is contract
     */
    function _mint(
        address _to,
        uint256 _id,
        uint256 _amount,
        bytes memory _data
    ) internal {
        // Add _amount
        balances[_to][_id] = balances[_to][_id].add(_amount);

        // Emit event
        emit TransferSingle(msg.sender, address(0x0), _to, _id, _amount);

        // Calling onReceive method if recipient is contract
        _callonERC1155Received(address(0x0), _to, _id, _amount, _data);
    }

    /**
     * @notice Mint tokens for each ids in _ids
     * @param _to       The address to mint tokens to
     * @param _ids      Array of ids to mint
     * @param _amounts  Array of amount of tokens to mint per id
     * @param _data    Data to pass if receiver is contract
     */
    function _batchMint(
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) internal {
        require(
            _ids.length == _amounts.length,
            "ERC1155MintBurn#batchMint: INVALID_ARRAYS_LENGTH"
        );

        // Number of mints to execute
        uint256 nMint = _ids.length;

        // Executing all minting
        for (uint256 i = 0; i < nMint; i++) {
            // Update storage balance
            balances[_to][_ids[i]] = balances[_to][_ids[i]].add(_amounts[i]);
        }

        // Emit batch mint event
        emit TransferBatch(msg.sender, address(0x0), _to, _ids, _amounts);

        // Calling onReceive method if recipient is contract
        _callonERC1155BatchReceived(address(0x0), _to, _ids, _amounts, _data);
    }

    /****************************************|
  |            Burning Functions           |
  |_______________________________________*/

    /**
     * @notice Burn _amount of tokens of a given token id
     * @param _from    The address to burn tokens from
     * @param _id      Token id to burn
     * @param _amount  The amount to be burned
     */
    function _burn(
        address _from,
        uint256 _id,
        uint256 _amount
    ) internal {
        //Substract _amount
        balances[_from][_id] = balances[_from][_id].sub(_amount);

        // Emit event
        emit TransferSingle(msg.sender, _from, address(0x0), _id, _amount);
    }

    /**
     * @notice Burn tokens of given token id for each (_ids[i], _amounts[i]) pair
     * @param _from     The address to burn tokens from
     * @param _ids      Array of token ids to burn
     * @param _amounts  Array of the amount to be burned
     */
    function _batchBurn(
        address _from,
        uint256[] memory _ids,
        uint256[] memory _amounts
    ) internal {
        require(
            _ids.length == _amounts.length,
            "ERC1155MintBurn#batchBurn: INVALID_ARRAYS_LENGTH"
        );

        // Number of mints to execute
        uint256 nBurn = _ids.length;

        // Executing all minting
        for (uint256 i = 0; i < nBurn; i++) {
            // Update storage balance
            balances[_from][_ids[i]] = balances[_from][_ids[i]].sub(
                _amounts[i]
            );
        }

        // Emit batch mint event
        emit TransferBatch(msg.sender, _from, address(0x0), _ids, _amounts);
    }
}

library Strings {
    // via https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol
    function strConcat(
        string memory _a,
        string memory _b,
        string memory _c,
        string memory _d,
        string memory _e
    ) internal pure returns (string memory) {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        bytes memory _bc = bytes(_c);
        bytes memory _bd = bytes(_d);
        bytes memory _be = bytes(_e);
        string memory abcde = new string(
            _ba.length + _bb.length + _bc.length + _bd.length + _be.length
        );
        bytes memory babcde = bytes(abcde);
        uint256 k = 0;
        for (uint256 i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
        for (uint256 i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
        for (uint256 i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
        for (uint256 i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
        for (uint256 i = 0; i < _be.length; i++) babcde[k++] = _be[i];
        return string(babcde);
    }

    function strConcat(
        string memory _a,
        string memory _b,
        string memory _c,
        string memory _d
    ) internal pure returns (string memory) {
        return strConcat(_a, _b, _c, _d, "");
    }

    function strConcat(
        string memory _a,
        string memory _b,
        string memory _c
    ) internal pure returns (string memory) {
        return strConcat(_a, _b, _c, "", "");
    }

    function strConcat(string memory _a, string memory _b)
        internal
        pure
        returns (string memory)
    {
        return strConcat(_a, _b, "", "", "");
    }

    function uint2str(uint256 _i)
        internal
        pure
        returns (string memory _uintAsString)
    {
        if (_i == 0) {
            return "0";
        }
        uint256 j = _i;
        uint256 len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint256 k = len - 1;
        while (_i != 0) {
            bstr[k--] = bytes1(uint8(48 + (_i % 10)));
            _i /= 10;
        }
        return string(bstr);
    }
}

contract OwnableDelegateProxy {}

contract ProxyRegistry {
    mapping(address => OwnableDelegateProxy) public proxies;
}

/**
 * @title ERC1155Tradable
 * ERC1155Tradable - ERC1155 contract that whitelists an operator address, 
 * has create and mint functionality, and supports useful standards from OpenZeppelin,
  like _exists(), name(), symbol(), and totalSupply()
 */
contract ERC1155Tradable is
    ERC1155,
    ERC1155MintBurn,
    ERC1155Metadata,
    Ownable,
    MinterRole,
    WhitelistAdminRole
{
    using Strings for string;

    address proxyRegistryAddress;
    uint256 internal _currentTokenID = 0;
    mapping(uint256 => address) public creators;
    mapping(uint256 => uint256) public tokenSupply;
    mapping(uint256 => uint256) public tokenMaxSupply;
    // Contract name
    string public name;
    // Contract symbol
    string public symbol;

    constructor(
        string memory _name,
        string memory _symbol,
        address _proxyRegistryAddress
    ) public {
        name = _name;
        symbol = _symbol;
        proxyRegistryAddress = _proxyRegistryAddress;
    }

    function removeWhitelistAdmin(address account) public onlyOwner {
        _removeWhitelistAdmin(account);
    }

    function removeMinter(address account) public onlyOwner {
        _removeMinter(account);
    }

    function uri(uint256 _id) public view returns (string memory) {
        require(_exists(_id), "ERC721Tradable#uri: NONEXISTENT_TOKEN");
        return Strings.strConcat(baseMetadataURI, Strings.uint2str(_id));
    }

    /**
     * @dev Returns the total quantity for a token ID
     * @param _id uint256 ID of the token to query
     * @return amount of token in existence
     */
    function totalSupply(uint256 _id) public view returns (uint256) {
        return tokenSupply[_id];
    }

    /**
     * @dev Returns the max quantity for a token ID
     * @param _id uint256 ID of the token to query
     * @return amount of token in existence
     */
    function maxSupply(uint256 _id) public view returns (uint256) {
        return tokenMaxSupply[_id];
    }

    /**
     * @dev Will update the base URL of token's URI
     * @param _newBaseMetadataURI New base URL of token's URI
     */
    function setBaseMetadataURI(string memory _newBaseMetadataURI)
        public
        onlyWhitelistAdmin
    {
        _setBaseMetadataURI(_newBaseMetadataURI);
    }

    /**
     * @dev Creates a new token type and assigns _initialSupply to an address
     * @param _maxSupply max supply allowed
     * @param _initialSupply Optional amount to supply the first owner
     * @param _uri Optional URI for this token type
     * @param _data Optional data to pass if receiver is contract
     * @return The newly created token ID
     */
    function create(
        uint256 _maxSupply,
        uint256 _initialSupply,
        string memory _uri,
        bytes memory _data
    ) public onlyWhitelistAdmin returns (uint256 tokenId) {
        require(_initialSupply <= _maxSupply, "_initialSupply > _maxSupply");
        uint256 _id = _getNextTokenID();
        _incrementTokenTypeId();
        creators[_id] = msg.sender;

        if (bytes(_uri).length > 0) {
            emit URI(_uri, _id);
        }

        if (_initialSupply != 0) _mint(msg.sender, _id, _initialSupply, _data);
        tokenSupply[_id] = _initialSupply;
        tokenMaxSupply[_id] = _maxSupply;
        return _id;
    }

    /**
     * @dev Creates multiple new token types and assigns _initialSupply[i] of each token type, to an address
     * @param _maxSupply Array of max supplies allowed
     * @param _initialSupply Array of optional amounts to supply the first owner
     * @param _uri Array of optional URIs for each token type
     * @param _data Optional data to pass if receiver is contract. Same for each new token type
     * @return Array of newly created token IDs
     */
    function batchCreate(
        uint256[] calldata _maxSupply,
        uint256[] calldata _initialSupply,
        string[] calldata _uri,
        bytes calldata _data
    ) external onlyWhitelistAdmin returns (uint256[] memory) {
        require(
            _initialSupply.length == _maxSupply.length &&
                _uri.length == _maxSupply.length,
            "Array lengths mismatch"
        );

        uint256[] memory _ids = new uint256[](_maxSupply.length);
        uint256 _id = 0;

        for (uint256 index = 0; index < _maxSupply.length; index++) {
            _id = create(
                _maxSupply[index],
                _initialSupply[index],
                _uri[index],
                _data
            );

            _ids[index] = _id;
        }
        return _ids;
    }

    /**
     * @dev Mints some amount of tokens to an address
     * @param _to          Address of the future owner of the token
     * @param _id          Token ID to mint
     * @param _quantity    Amount of tokens to mint
     * @param _data        Data to pass if receiver is contract
     */
    function mint(
        address _to,
        uint256 _id,
        uint256 _quantity,
        bytes memory _data
    ) public onlyMinter {
        uint256 tokenId = _id;
        require(
            tokenSupply[tokenId] < tokenMaxSupply[tokenId],
            "Max supply reached"
        );
        _mint(_to, _id, _quantity, _data);
        tokenSupply[_id] = tokenSupply[_id].add(_quantity);
    }

    /**
     * @dev Mints some amount of tokens to an address
     * @param _to       The address to mint tokens to
     * @param _ids      Array of ids to mint
     * @param _amounts  Array of amount of tokens to mint per id
     * @param _data     Data to pass if receiver is contract
     */
    function batchMint(
        address _to,
        uint256[] memory _ids,
        uint256[] memory _amounts,
        bytes memory _data
    ) public onlyMinter {
        uint256 nMints = _ids.length;
        for (uint256 i = 0; i < nMints; i++) {
            uint256 tokenId = _ids[i];
            require(
                tokenSupply[tokenId] < tokenMaxSupply[tokenId],
                "Max supply reached"
            );
            tokenSupply[tokenId] = tokenSupply[tokenId].add(_amounts[i]);
        }
        _batchMint(_to, _ids, _amounts, _data);
    }

    /**
     * @notice Burn _amount of tokens of a given token id
     * @param _from    The address to burn tokens from
     * @param _id      Token id to burn
     * @param _amount  The amount to be burned
     */
    function burn(
        address _from,
        uint256 _id,
        uint256 _amount
    ) public onlyOwner {
        tokenSupply[_id] = tokenSupply[_id].sub(_amount);
        _burn(_from, _id, _amount);
    }

    /**
     * Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-free listings.
     */
    function isApprovedForAll(address _owner, address _operator)
        public
        view
        returns (bool isOperator)
    {
        // Whitelist OpenSea proxy contract for easy trading.
        ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress);
        if (address(proxyRegistry.proxies(_owner)) == _operator) {
            return true;
        }

        return ERC1155.isApprovedForAll(_owner, _operator);
    }

    /**
     * @dev Returns whether the specified token exists by checking to see if it has a creator
     * @param _id uint256 ID of the token to query the existence of
     * @return bool whether the token exists
     */
    function _exists(uint256 _id) internal view returns (bool) {
        return creators[_id] != address(0);
    }

    /**
     * @dev calculates the next token ID based on value of _currentTokenID
     * @return uint256 for the next token ID
     */
    function _getNextTokenID() private view returns (uint256) {
        return _currentTokenID.add(1);
    }

    /**
     * @dev increments the value of _currentTokenID
     */
    function _incrementTokenTypeId() private {
        _currentTokenID++;
    }
}

File 6 of 8 : Math.sol
pragma solidity ^0.5.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a >= b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow, so we distribute
        return (a / 2) + (b / 2) + ((a % 2 + b % 2) / 2);
    }
}

File 7 of 8 : IERC20.sol
pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 8 of 8 : Address.sol
pragma solidity ^0.5.5;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following 
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1

-----Decoded View---------------
Arg [0] : _proxyRegistryAddress (address): 0xa5409ec958C83C3f309868babACA7c86DCB077c1

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1


Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.