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 contract ERC1155Metadata    - function uri(uint256 _id)    - function _logURIs(uint256[] memory _t ...    - function _logURIs(uint256[] memory _t ...    - function _setBaseMetadataURI(string m ...    - function _uint2str(uint256 _i) interface IERC1155TokenReceiver    - function onERC1155Received(    - function onERC1155BatchReceived(    - function supportsInterface(bytes4 int ... interface IERC165    - function supportsInterface(bytes4 _in ... library Address    - function isContract(address account)    - function toPayable(address account)    - function sendValue(address payable re ...  contract Context    - function _msgSender()    - function _msgData() library SafeMath    - function add(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b)    - function sub(uint256 a, uint256 b, st ...    - function mul(uint256 a, uint256 b)    - function div(uint256 a, uint256 b)    - function div(uint256 a, uint256 b, st ...    - function mod(uint256 a, uint256 b)    - function mod(uint256 a, uint256 b, st ...  contract OwnableDelegateProxy } library Roles    - function add(Role storage role, addre ...    - function remove(Role storage role, ad ...    - function has(Role storage role, addre ... library Strings    - function strConcat(    - function strConcat(    - function strConcat(    - function strConcat(string memory _a, ...    - function uint2str(uint256 _i)  contract ERC1155 is IERC165    - function safeTransferFrom(    - function safeBatchTransferFrom(    - function _safeTransferFrom(    - function _callonERC1155Received(    - function _safeBatchTransferFrom(    - function _callonERC1155BatchReceived(    - function setApprovalForAll(address _o ...    - function isApprovedForAll(address _ow ...    - function balanceOf(address _owner, ui ...    - function balanceOfBatch(address[] mem ...    - function supportsInterface(bytes4 _in ...  contract MinterRole is Context    - function isMinter(address account)    - function addMinter(address account)    - function renounceMinter()    - function _addMinter(address account)    - function _removeMinter(address accoun ...  contract Ownable is Context    - function owner()    - function isOwner()    - function renounceOwnership()    - function transferOwnership(address ne ...    - function _transferOwnership(address n ...  contract ProxyRegistry  contract WhitelistAdminRole is Con ...    - function isWhitelistAdmin(address acc ...    - function addWhitelistAdmin(address ac ...    - function renounceWhitelistAdmin()    - function _addWhitelistAdmin(address a ...    - function _removeWhitelistAdmin(addres ...  contract ERC1155MintBurn is ERC115 ...    - function _mint(    - function _batchMint(    - function _burn(    - function _batchBurn(  contract ERC1155Tradable is    - function removeWhitelistAdmin(address ...    - function removeMinter(address account ...    - function uri(uint256 _id)    - function totalSupply(uint256 _id)    - function maxSupply(uint256 _id)    - function setBaseMetadataURI(string me ...    - function create(    - function mint(    - function isApprovedForAll(address _ow ...    - function _exists(uint256 _id)    - function _getNextTokenID()    - function _incrementTokenTypeId()  contract StakeDaoNFT is ERC1155Tra ... *    - function contractURI()

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/**
 *Submitted for verification at Etherscan.io on 2021-04-16
*/

// SPDX-License-Identifier: UNLICENSED

pragma solidity 0.5.17;



// Part: ERC1155Metadata

/**
 * @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);
    }
}

// Part: IERC1155TokenReceiver

/**
 * @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);
}

// Part: IERC165

/**
 * @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);
}

// Part: OpenZeppelin/[email protected]/Address

/**
 * @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");
    }
}

// Part: OpenZeppelin/[email protected]/Context

/*
 * @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;
    }
}

// Part: OpenZeppelin/[email protected]/SafeMath

/**
 * @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;
    }
}

// Part: OwnableDelegateProxy

contract OwnableDelegateProxy {}

// Part: Roles

/**
 * @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];
    }
}

// Part: Strings

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);
    }
}

// Part: ERC1155

/**
 * @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;
    }
}

// Part: MinterRole

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);
    }
}

// Part: OpenZeppelin/[email protected]/Ownable

/**
 * @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;
    }
}

// Part: ProxyRegistry

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

// Part: WhitelistAdminRole

/**
 * @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);
    }
}

// Part: ERC1155MintBurn

/**
 * @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);
    }
}

// Part: ERC1155Tradable

/**
 * @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 private _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 calldata _uri,
        bytes calldata _data
    ) external onlyWhitelistAdmin returns (uint256 tokenId) {
        require(
            _initialSupply <= _maxSupply,
            "Initial supply cannot be more than max supply"
        );
        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 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);
    }

    /**
     * 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: StakeDaoNFT.sol

/**
 * @title Stake Dao NFT Contract
 */
contract StakeDaoNFT is ERC1155Tradable {
    constructor(address _proxyRegistryAddress)
        public
        ERC1155Tradable("Stake DAO NFT", "sdNFT", _proxyRegistryAddress)
    {
        _setBaseMetadataURI(
            "https://gateway.pinata.cloud/ipfs/QmZwsoGKw42DxNwnQXKtWiuULSzFrUPCNHUx6yhNgrUMj6/metadata/"
        );
    }

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

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000a5409ec958c83c3f309868babaca7c86dcb077c1

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

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