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•  contract Ownable
•    - function renounceOwnership()
•    - function transferOwnership(address _n ...
•    - function _transferOwnership(address _ ...
• interface ERC165
•    - function supportsInterface(bytes4 _in ...
•  contract SupportsInterfaceWithLook ...
•    - function supportsInterface(bytes4 _in ...
•    - function _registerInterface(bytes4 _i ...
• library AddressUtils
•    - function isContract(address _addr)
• library SafeMath
•    - function mul(uint256 _a, uint256 _b)
•    - function div(uint256 _a, uint256 _b)
•    - function sub(uint256 _a, uint256 _b)
•    - function add(uint256 _a, uint256 _b)
•  contract ERC721Receiver
•    - function onERC721Received(
•  contract ERC721Basic is ERC165
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function exists(uint256 _tokenId)
•    - function approve(address _to, uint256 ...
•    - function getApproved(uint256 _tokenId ...
•    - function setApprovalForAll(address _o ...
•    - function isApprovedForAll(address _ow ...
•    - function transferFrom(address _from, ...
•    - function safeTransferFrom(address _fr ...
•    - function safeTransferFrom(
•  contract ERC721BasicToken is Suppo ...
•    - function balanceOf(address _owner)
•    - function ownerOf(uint256 _tokenId)
•    - function exists(uint256 _tokenId)
•    - function approve(address _to, uint256 ...
•    - function getApproved(uint256 _tokenId ...
•    - function setApprovalForAll(address _t ...
•    - function isApprovedForAll(
•    - function transferFrom(
•    - function safeTransferFrom(
•    - function safeTransferFrom(
•    - function isApprovedOrOwner(
•    - function _mint(address _to, uint256 _ ...
•    - function _burn(address _owner, uint25 ...
•    - function clearApproval(address _owner ...
•    - function addTokenTo(address _to, uint ...
•    - function removeTokenFrom(address _fro ...
•    - function checkAndCallSafeTransfer(
•  contract ERC721Enumerable is ERC72 ...
•    - function totalSupply()
•    - function tokenOfOwnerByIndex(
•    - function tokenByIndex(uint256 _index)
•  contract ERC721Metadata is ERC721B ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 _tokenId)
•  contract ERC721 is ERC721Basic, ER ...
•  contract ERC721Token is SupportsIn ...
•    - function name()
•    - function symbol()
•    - function tokenURI(uint256 _tokenId)
•    - function tokenOfOwnerByIndex(
•    - function totalSupply()
•    - function tokenByIndex(uint256 _index)
•    - function _setTokenURI(uint256 _tokenI ...
•    - function addTokenTo(address _to, uint ...
•    - function removeTokenFrom(address _fro ...
•    - function _mint(address _to, uint256 _ ...
•    - function _burn(address _owner, uint25 ...
•  contract Kudos is ERC721Token(& ... *
•    - function mint(address _to, uint256 _p ...
•    - function clone(address _to, uint256 _ ...
•    - function burn(address _owner, uint256 ...
•    - function setCloneFeePercentage(uint25 ...
•    - function setMintable(bool _isMintable ...
•    - function setPrice(uint256 _tokenId, u ...
•    - function setTokenURI(uint256 _tokenId ...
•    - function getKudosById(uint256 _tokenI ...
•    - function getNumClonesInWild(uint256 _ ...
•    - function getLatestId()

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/**
 *Submitted for verification at gnosisscan.io on 2022-08-03
*/

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

pragma solidity ^0.4.24;


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   * @notice Renouncing to ownership will leave the contract without an owner.
   * It will not be possible to call the functions with the `onlyOwner`
   * modifier anymore.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}
// File: openzeppelin-solidity/contracts/introspection/ERC165.sol

pragma solidity ^0.4.24;


/**
 * @title ERC165
 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md
 */
interface ERC165 {

  /**
   * @notice Query if a contract implements an interface
   * @param _interfaceId The interface identifier, as specified in ERC-165
   * @dev Interface identification is specified in ERC-165. This function
   * uses less than 30,000 gas.
   */
  function supportsInterface(bytes4 _interfaceId)
    external
    view
    returns (bool);
}
// File: openzeppelin-solidity/contracts/introspection/SupportsInterfaceWithLookup.sol

pragma solidity ^0.4.24;



/**
 * @title SupportsInterfaceWithLookup
 * @author Matt Condon (@shrugs)
 * @dev Implements ERC165 using a lookup table.
 */
contract SupportsInterfaceWithLookup is ERC165 {

  bytes4 public constant InterfaceId_ERC165 = 0x01ffc9a7;
  /**
   * 0x01ffc9a7 ===
   *   bytes4(keccak256('supportsInterface(bytes4)'))
   */

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

  /**
   * @dev A contract implementing SupportsInterfaceWithLookup
   * implement ERC165 itself
   */
  constructor()
    public
  {
    _registerInterface(InterfaceId_ERC165);
  }

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

  /**
   * @dev private method for registering an interface
   */
  function _registerInterface(bytes4 _interfaceId)
    internal
  {
    require(_interfaceId != 0xffffffff);
    supportedInterfaces[_interfaceId] = true;
  }
}
// File: openzeppelin-solidity/contracts/AddressUtils.sol

pragma solidity ^0.4.24;


/**
 * Utility library of inline functions on addresses
 */
library AddressUtils {

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

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

pragma solidity ^0.4.24;


/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (_a == 0) {
      return 0;
    }

    c = _a * _b;
    assert(c / _a == _b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
    // assert(_b > 0); // Solidity automatically throws when dividing by 0
    // uint256 c = _a / _b;
    // assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
    return _a / _b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
    assert(_b <= _a);
    return _a - _b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    c = _a + _b;
    assert(c >= _a);
    return c;
  }
}
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Receiver.sol

pragma solidity ^0.4.24;


/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
contract ERC721Receiver {
  /**
   * @dev Magic value to be returned upon successful reception of an NFT
   *  Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`,
   *  which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
   */
  bytes4 internal constant ERC721_RECEIVED = 0x150b7a02;

  /**
   * @notice Handle the receipt of an NFT
   * @dev The ERC721 smart contract calls this function on the recipient
   * after a `safetransfer`. This function MAY throw to revert and reject the
   * transfer. Return of other than the magic value MUST result in the
   * transaction being reverted.
   * Note: the contract address is always the message sender.
   * @param _operator The address which called `safeTransferFrom` function
   * @param _from The address which previously owned the token
   * @param _tokenId The NFT identifier which is being transferred
   * @param _data Additional data with no specified format
   * @return `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
   */
  function onERC721Received(
    address _operator,
    address _from,
    uint256 _tokenId,
    bytes _data
  )
    public
    returns(bytes4);
}
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Basic.sol

pragma solidity ^0.4.24;



/**
 * @title ERC721 Non-Fungible Token Standard basic interface
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Basic is ERC165 {

  bytes4 internal constant InterfaceId_ERC721 = 0x80ac58cd;
  /*
   * 0x80ac58cd ===
   *   bytes4(keccak256('balanceOf(address)')) ^
   *   bytes4(keccak256('ownerOf(uint256)')) ^
   *   bytes4(keccak256('approve(address,uint256)')) ^
   *   bytes4(keccak256('getApproved(uint256)')) ^
   *   bytes4(keccak256('setApprovalForAll(address,bool)')) ^
   *   bytes4(keccak256('isApprovedForAll(address,address)')) ^
   *   bytes4(keccak256('transferFrom(address,address,uint256)')) ^
   *   bytes4(keccak256('safeTransferFrom(address,address,uint256)')) ^
   *   bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)'))
   */

  bytes4 internal constant InterfaceId_ERC721Exists = 0x4f558e79;
  /*
   * 0x4f558e79 ===
   *   bytes4(keccak256('exists(uint256)'))
   */

  bytes4 internal constant InterfaceId_ERC721Enumerable = 0x780e9d63;
  /**
   * 0x780e9d63 ===
   *   bytes4(keccak256('totalSupply()')) ^
   *   bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) ^
   *   bytes4(keccak256('tokenByIndex(uint256)'))
   */

  bytes4 internal constant InterfaceId_ERC721Metadata = 0x5b5e139f;
  /**
   * 0x5b5e139f ===
   *   bytes4(keccak256('name()')) ^
   *   bytes4(keccak256('symbol()')) ^
   *   bytes4(keccak256('tokenURI(uint256)'))
   */

  event Transfer(
    address indexed _from,
    address indexed _to,
    uint256 indexed _tokenId
  );
  event Approval(
    address indexed _owner,
    address indexed _approved,
    uint256 indexed _tokenId
  );
  event ApprovalForAll(
    address indexed _owner,
    address indexed _operator,
    bool _approved
  );

  function balanceOf(address _owner) public view returns (uint256 _balance);
  function ownerOf(uint256 _tokenId) public view returns (address _owner);
  function exists(uint256 _tokenId) public view returns (bool _exists);

  function approve(address _to, uint256 _tokenId) public;
  function getApproved(uint256 _tokenId)
    public view returns (address _operator);

  function setApprovalForAll(address _operator, bool _approved) public;
  function isApprovedForAll(address _owner, address _operator)
    public view returns (bool);

  function transferFrom(address _from, address _to, uint256 _tokenId) public;
  function safeTransferFrom(address _from, address _to, uint256 _tokenId)
    public;

  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    public;
}
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721BasicToken.sol

pragma solidity ^0.4.24;







/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721Basic {

  using SafeMath for uint256;
  using AddressUtils for address;

  // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
  // which can be also obtained as `ERC721Receiver(0).onERC721Received.selector`
  bytes4 private constant ERC721_RECEIVED = 0x150b7a02;

  // Mapping from token ID to owner
  mapping (uint256 => address) internal tokenOwner;

  // Mapping from token ID to approved address
  mapping (uint256 => address) internal tokenApprovals;

  // Mapping from owner to number of owned token
  mapping (address => uint256) internal ownedTokensCount;

  // Mapping from owner to operator approvals
  mapping (address => mapping (address => bool)) internal operatorApprovals;

  constructor()
    public
  {
    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721);
    _registerInterface(InterfaceId_ERC721Exists);
  }

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

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

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

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

    tokenApprovals[_tokenId] = _to;
    emit Approval(owner, _to, _tokenId);
  }

  /**
   * @dev Gets the approved address for a token ID, or zero if no address set
   * @param _tokenId uint256 ID of the token to query the approval of
   * @return address currently approved for the given token ID
   */
  function getApproved(uint256 _tokenId) public view returns (address) {
    return tokenApprovals[_tokenId];
  }

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

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

  /**
   * @dev Transfers the ownership of a given token ID to another address
   * Usage of this method is discouraged, use `safeTransferFrom` whenever possible
   * Requires the msg sender to be the owner, approved, or operator
   * @param _from current owner of the token
   * @param _to address to receive the ownership of the given token ID
   * @param _tokenId uint256 ID of the token to be transferred
  */
  function transferFrom(
    address _from,
    address _to,
    uint256 _tokenId
  )
    public
  {
    require(isApprovedOrOwner(msg.sender, _tokenId));
    require(_from != address(0));
    require(_to != address(0));

    clearApproval(_from, _tokenId);
    removeTokenFrom(_from, _tokenId);
    addTokenTo(_to, _tokenId);

    emit Transfer(_from, _to, _tokenId);
  }

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

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

  /**
   * @dev Returns whether the given spender can transfer a given token ID
   * @param _spender address of the spender to query
   * @param _tokenId uint256 ID of the token to be transferred
   * @return bool whether the msg.sender is approved for the given token ID,
   *  is an operator of the owner, or is the owner of the token
   */
  function isApprovedOrOwner(
    address _spender,
    uint256 _tokenId
  )
    internal
    view
    returns (bool)
  {
    address owner = ownerOf(_tokenId);
    // Disable solium check because of
    // https://github.com/duaraghav8/Solium/issues/175
    // solium-disable-next-line operator-whitespace
    return (
      _spender == owner ||
      getApproved(_tokenId) == _spender ||
      isApprovedForAll(owner, _spender)
    );
  }

  /**
   * @dev Internal function to mint a new token
   * Reverts if the given token ID already exists
   * @param _to The address that will own the minted token
   * @param _tokenId uint256 ID of the token to be minted by the msg.sender
   */
  function _mint(address _to, uint256 _tokenId) internal {
    require(_to != address(0));
    addTokenTo(_to, _tokenId);
    emit Transfer(address(0), _to, _tokenId);
  }

  /**
   * @dev Internal function to burn a specific token
   * Reverts if the token does not exist
   * @param _tokenId uint256 ID of the token being burned by the msg.sender
   */
  function _burn(address _owner, uint256 _tokenId) internal {
    clearApproval(_owner, _tokenId);
    removeTokenFrom(_owner, _tokenId);
    emit Transfer(_owner, address(0), _tokenId);
  }

  /**
   * @dev Internal function to clear current approval of a given token ID
   * Reverts if the given address is not indeed the owner of the token
   * @param _owner owner of the token
   * @param _tokenId uint256 ID of the token to be transferred
   */
  function clearApproval(address _owner, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _owner);
    if (tokenApprovals[_tokenId] != address(0)) {
      tokenApprovals[_tokenId] = address(0);
    }
  }

  /**
   * @dev Internal function to add a token ID to the list of a given address
   * @param _to address representing the new owner of the given token ID
   * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
   */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    require(tokenOwner[_tokenId] == address(0));
    tokenOwner[_tokenId] = _to;
    ownedTokensCount[_to] = ownedTokensCount[_to].add(1);
  }

  /**
   * @dev Internal function to remove a token ID from the list of a given address
   * @param _from address representing the previous owner of the given token ID
   * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
   */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    require(ownerOf(_tokenId) == _from);
    ownedTokensCount[_from] = ownedTokensCount[_from].sub(1);
    tokenOwner[_tokenId] = address(0);
  }

  /**
   * @dev Internal function to invoke `onERC721Received` on a target address
   * The call is not executed if the target address is not a contract
   * @param _from address representing the previous owner of the given token ID
   * @param _to target address that will receive the tokens
   * @param _tokenId uint256 ID of the token to be transferred
   * @param _data bytes optional data to send along with the call
   * @return whether the call correctly returned the expected magic value
   */
  function checkAndCallSafeTransfer(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    internal
    returns (bool)
  {
    if (!_to.isContract()) {
      return true;
    }
    bytes4 retval = ERC721Receiver(_to).onERC721Received(
      msg.sender, _from, _tokenId, _data);
    return (retval == ERC721_RECEIVED);
  }
}


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

pragma solidity ^0.4.24;



/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Enumerable is ERC721Basic {
  function totalSupply() public view returns (uint256);
  function tokenOfOwnerByIndex(
    address _owner,
    uint256 _index
  )
    public
    view
    returns (uint256 _tokenId);

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


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Metadata is ERC721Basic {
  function name() external view returns (string _name);
  function symbol() external view returns (string _symbol);
  function tokenURI(uint256 _tokenId) public view returns (string);
}


/**
 * @title ERC-721 Non-Fungible Token Standard, full implementation interface
 * @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721 is ERC721Basic, ERC721Enumerable, ERC721Metadata {
}
// File: openzeppelin-solidity/contracts/token/ERC721/ERC721Token.sol

pragma solidity ^0.4.24;





/**
 * @title Full ERC721 Token
 * This implementation includes all the required and some optional functionality of the ERC721 standard
 * Moreover, it includes approve all functionality using operator terminology
 * @dev see https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
 */
contract ERC721Token is SupportsInterfaceWithLookup, ERC721BasicToken, ERC721 {

  // Token name
  string internal name_;

  // Token symbol
  string internal symbol_;

  // Mapping from owner to list of owned token IDs
  mapping(address => uint256[]) internal ownedTokens;

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

  // Array with all token ids, used for enumeration
  uint256[] internal allTokens;

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

  // Optional mapping for token URIs
  mapping(uint256 => string) internal tokenURIs;

  /**
   * @dev Constructor function
   */
  constructor(string _name, string _symbol) public {
    name_ = _name;
    symbol_ = _symbol;

    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721Enumerable);
    _registerInterface(InterfaceId_ERC721Metadata);
  }

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

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

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

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

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

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

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

  /**
   * @dev Internal function to add a token ID to the list of a given address
   * @param _to address representing the new owner of the given token ID
   * @param _tokenId uint256 ID of the token to be added to the tokens list of the given address
   */
  function addTokenTo(address _to, uint256 _tokenId) internal {
    super.addTokenTo(_to, _tokenId);
    uint256 length = ownedTokens[_to].length;
    ownedTokens[_to].push(_tokenId);
    ownedTokensIndex[_tokenId] = length;
  }

  /**
   * @dev Internal function to remove a token ID from the list of a given address
   * @param _from address representing the previous owner of the given token ID
   * @param _tokenId uint256 ID of the token to be removed from the tokens list of the given address
   */
  function removeTokenFrom(address _from, uint256 _tokenId) internal {
    super.removeTokenFrom(_from, _tokenId);

    // To prevent a gap in the array, we store the last token in the index of the token to delete, and
    // then delete the last slot.
    uint256 tokenIndex = ownedTokensIndex[_tokenId];
    uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
    uint256 lastToken = ownedTokens[_from][lastTokenIndex];

    ownedTokens[_from][tokenIndex] = lastToken;
    // This also deletes the contents at the last position of the array
    ownedTokens[_from].length--;

    // Note that this will handle single-element arrays. In that case, both tokenIndex and lastTokenIndex are going to
    // be zero. Then we can make sure that we will remove _tokenId from the ownedTokens list since we are first swapping
    // the lastToken to the first position, and then dropping the element placed in the last position of the list

    ownedTokensIndex[_tokenId] = 0;
    ownedTokensIndex[lastToken] = tokenIndex;
  }

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

    allTokensIndex[_tokenId] = allTokens.length;
    allTokens.push(_tokenId);
  }

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

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

    // Reorg all tokens array
    uint256 tokenIndex = allTokensIndex[_tokenId];
    uint256 lastTokenIndex = allTokens.length.sub(1);
    uint256 lastToken = allTokens[lastTokenIndex];

    allTokens[tokenIndex] = lastToken;
    allTokens[lastTokenIndex] = 0;

    allTokens.length--;
    allTokensIndex[_tokenId] = 0;
    allTokensIndex[lastToken] = tokenIndex;
  }

}
// File: browser/Kudos.sol

pragma solidity ^0.4.24;




/// @title Kudos
/// @author Jason Haas <[email protected]>
/// @notice Kudos ERC721 interface for minting, cloning, and transferring Kudos tokens.
contract Kudos is ERC721Token("Achievmintry", "CHIEV"), Ownable {
    using SafeMath for uint256;

    struct Kudo {
        uint256 priceFinney;
        uint256 numClonesAllowed;
        uint256 numClonesInWild;
        uint256 clonedFromId;
    }

    Kudo[] public kudos;
    uint256 public cloneFeePercentage = 50;
    bool public isMintable = true;

    modifier mintable {
        require(
            isMintable == true,
            "New kudos are no longer mintable on this contract.  Please see KUDOS_CONTRACT_MAINNET at http://gitcoin.co/l/gcsettings for latest address."
        );
        _;
    }

    constructor () public {
        // If the array is new, skip over the first index.
        if(kudos.length == 0) {
            Kudo memory _dummyKudo = Kudo({priceFinney: 0,numClonesAllowed: 0, numClonesInWild: 0,
                                           clonedFromId: 0
                                           });
            kudos.push(_dummyKudo);
        }
    }

    /// @dev mint(): Mint a new Gen0 Kudos.  These are the tokens that other Kudos will be "cloned from".
    /// @param _to Address to mint to.
    /// @param _priceFinney Price of the Kudos in Finney.
    /// @param _numClonesAllowed Maximum number of times this Kudos is allowed to be cloned.
    /// @param _tokenURI A URL to the JSON file containing the metadata for the Kudos.  See metadata.json for an example.
    /// @return the tokenId of the Kudos that has been minted.  Note that in a transaction only the tx_hash is returned.
    function mint(address _to, uint256 _priceFinney, uint256 _numClonesAllowed, string _tokenURI) public mintable onlyOwner returns (uint256 tokenId) {

        Kudo memory _kudo = Kudo({priceFinney: _priceFinney, numClonesAllowed: _numClonesAllowed,
                                  numClonesInWild: 0, clonedFromId: 0
                                  });
        // The new kudo is pushed onto the array and minted
        // Note that Solidity uses 0 as a default value when an item is not found in a mapping.

        tokenId = kudos.push(_kudo) - 1;
        kudos[tokenId].clonedFromId = tokenId;

        _mint(_to, tokenId);
        _setTokenURI(tokenId, _tokenURI);

    }

    /// @dev clone(): Clone a new Kudos from a Gen0 Kudos.
    /// @param _to The address to clone to.
    /// @param _tokenId The token id of the Kudos to clone and transfer.
    /// @param _numClonesRequested Number of clones to generate.
    function clone(address _to, uint256 _tokenId, uint256 _numClonesRequested) public payable mintable {
        // Grab existing Kudo blueprint
        Kudo memory _kudo = kudos[_tokenId];
        uint256 cloningCost  = _kudo.priceFinney * 10**15 * _numClonesRequested;
        require(
            _kudo.numClonesInWild + _numClonesRequested <= _kudo.numClonesAllowed,
            "The number of Kudos clones requested exceeds the number of clones allowed.");
        require(
            msg.value >= cloningCost,
            "Not enough Wei to pay for the Kudos clones.");

        // Pay the contract owner the cloneFeePercentage amount
        uint256 contractOwnerFee = (cloningCost.mul(cloneFeePercentage)).div(100);
        owner.transfer(contractOwnerFee);

        // Pay the token owner the cloningCost - contractOwnerFee
        uint256 tokenOwnerFee = cloningCost.sub(contractOwnerFee);
        ownerOf(_tokenId).transfer(tokenOwnerFee);

        // Update original kudo struct in the array
        _kudo.numClonesInWild += _numClonesRequested;
        kudos[_tokenId] = _kudo;

        // Create new kudo, don't let it be cloned
        for (uint i = 0; i < _numClonesRequested; i++) {
            Kudo memory _newKudo;
            _newKudo.priceFinney = _kudo.priceFinney;
            _newKudo.numClonesAllowed = 0;
            _newKudo.numClonesInWild = 0;
            _newKudo.clonedFromId = _tokenId;

            // Note that Solidity uses 0 as a default value when an item is not found in a mapping.
            uint256 newTokenId = kudos.push(_newKudo) - 1;

            // Mint the new kudos to the _to account
            _mint(_to, newTokenId);

            // Use the same tokenURI metadata from the Gen0 Kudos
            string memory _tokenURI = tokenURI(_tokenId);
            _setTokenURI(newTokenId, _tokenURI);
        }
        // Return the any leftvoer ETH to the sender
        msg.sender.transfer(msg.value - contractOwnerFee - tokenOwnerFee);
    }


    /// @dev burn(): Burn Kudos token.
    /// @param _owner The owner address of the token to burn.
    /// @param _tokenId The Kudos ID to be burned.
    function burn(address _owner, uint256 _tokenId) public onlyOwner {
        Kudo memory _kudo = kudos[_tokenId];
        uint256 gen0Id = _kudo.clonedFromId;
        if (_tokenId != gen0Id) {
            Kudo memory _gen0Kudo = kudos[gen0Id];
            _gen0Kudo.numClonesInWild -= 1;
            kudos[gen0Id] = _gen0Kudo;
        }
        delete kudos[_tokenId];
        _burn(_owner, _tokenId);
    }

    /// @dev setCloneFeePercentage(): Update the Kudos clone fee percentage.  Upon cloning a new kudos,
    ///                               cloneFeePercentage will go to the contract owner, and
    ///                               (100 - cloneFeePercentage) will go to the Gen0 Kudos owner.
    /// @param _cloneFeePercentage The percentage fee between 0 and 100.
    function setCloneFeePercentage(uint256 _cloneFeePercentage) public onlyOwner {
        require(
            _cloneFeePercentage >= 0 && _cloneFeePercentage <= 100,
            "Invalid range for cloneFeePercentage.  Must be between 0 and 100.");
        cloneFeePercentage = _cloneFeePercentage;
    }

    /// @dev setMintable(): set the isMintable public variable.  When set to `false`, no new 
    ///                     kudos are allowed to be minted or cloned.  However, all of already
    ///                     existing kudos will remain unchanged.
    /// @param _isMintable flag for the mintable function modifier.
    function setMintable(bool _isMintable) public onlyOwner {
        isMintable = _isMintable;
    }

    /// @dev setPrice(): Update the Kudos listing price.
    /// @param _tokenId The Kudos Id.
    /// @param _newPriceFinney The new price of the Kudos.
    function setPrice(uint256 _tokenId, uint256 _newPriceFinney) public onlyOwner {
        Kudo memory _kudo = kudos[_tokenId];

        _kudo.priceFinney = _newPriceFinney;
        kudos[_tokenId] = _kudo;
    }

    /// @dev setTokenURI(): Set an existing token URI.
    /// @param _tokenId The token id.
    /// @param _tokenURI The tokenURI string.  Typically this will be a link to a json file on IPFS.
    function setTokenURI(uint256 _tokenId, string _tokenURI) public onlyOwner {
        _setTokenURI(_tokenId, _tokenURI);
    }

    /// @dev getKudosById(): Return a Kudos struct/array given a Kudos Id. 
    /// @param _tokenId The Kudos Id.
    /// @return the Kudos struct, in array form.
    function getKudosById(uint256 _tokenId) view public returns (uint256 priceFinney,
                                                                uint256 numClonesAllowed,
                                                                uint256 numClonesInWild,
                                                                uint256 clonedFromId
                                                                )
    {
        Kudo memory _kudo = kudos[_tokenId];

        priceFinney = _kudo.priceFinney;
        numClonesAllowed = _kudo.numClonesAllowed;
        numClonesInWild = _kudo.numClonesInWild;
        clonedFromId = _kudo.clonedFromId;
    }

    /// @dev getNumClonesInWild(): Return a Kudos struct/array given a Kudos Id. 
    /// @param _tokenId The Kudos Id.
    /// @return the number of cloes in the wild
    function getNumClonesInWild(uint256 _tokenId) view public returns (uint256 numClonesInWild)
    {   
        Kudo memory _kudo = kudos[_tokenId];

        numClonesInWild = _kudo.numClonesInWild;
    }

    /// @dev getLatestId(): Returns the newest Kudos Id in the kudos array.
    /// @return the latest kudos id.
    function getLatestId() view public returns (uint256 tokenId)
    {
        if (kudos.length == 0) {
            tokenId = 0;
        } else {
            tokenId = kudos.length - 1;
        }
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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