Contract

0x5C7b19F83AC93d8268da02CC06Cb61089d6d952A

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ContractCreator

0x68303711...69a1BF6B3 at txn 0x45c85f0464e452034a99a7b2a7b4b3665978430badf3112912438dd590988532

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Bitizen Lambo (LAMBO)

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Latest 2 from a total of 2 transactions

	Transaction Hash	Method	Block		From		To
	0xdadbb2cf4e4d651261c3ce51704095de4161254bf876283fc13e50929a9fd62d	Do Pause	6866286	2018-12-11 10:06:30	2195 days ago	1544522790	0x68303711...69a1BF6B3	IN	0x5C7b19F8...89d6d952A	0 ETH$0.00	0.00042501	10
	0xe724933fd3ee917cdfbd31d96447ca0d37d48752911c08560432bc945993456a	Add Operator	6247172	2018-08-31 14:56:08	2297 days ago	1535727368	0x68303711...69a1BF6B3	IN	0x5C7b19F8...89d6d952A	0 ETH$0.00	0.00112698	13

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Contract Source Code Verified (Exact Match)

Contract Name:

BitizenCarToken

Compiler Version

v0.4.24+commit.e67f0147

Optimization Enabled:

Yes with 200 runs

Other Settings:

default evmVersion

Contract Source Code (Solidity)

IDE

/**
 *Submitted for verification at Etherscan.io on 2018-08-31
*/

pragma solidity ^0.4.24; 
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);
}

interface ERC721 /* is ERC165 */ {
    /// @dev This emits when ownership of any NFT changes by any mechanism.
    ///  This event emits when NFTs are created (`from` == 0) and destroyed
    ///  (`to` == 0). Exception: during contract creation, any number of NFTs
    ///  may be created and assigned without emitting Transfer. At the time of
    ///  any transfer, the approved address for that NFT (if any) is reset to none.
    event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId);

    /// @dev This emits when the approved address for an NFT is changed or
    ///  reaffirmed. The zero address indicates there is no approved address.
    ///  When a Transfer event emits, this also indicates that the approved
    ///  address for that NFT (if any) is reset to none.
    event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId);

    /// @dev This emits when an operator is enabled or disabled for an owner.
    ///  The operator can manage all NFTs of the owner.
    event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved);

    /// @notice Count all NFTs assigned to an owner
    /// @dev NFTs assigned to the zero address are considered invalid, and this
    ///  function throws for queries about the zero address.
    /// @param _owner An address for whom to query the balance
    /// @return The number of NFTs owned by `_owner`, possibly zero
    function balanceOf(address _owner) external view returns (uint256);

    /// @notice Find the owner of an NFT
    /// @dev NFTs assigned to zero address are considered invalid, and queries
    ///  about them do throw.
    /// @param _tokenId The identifier for an NFT
    /// @return The address of the owner of the NFT
    function ownerOf(uint256 _tokenId) external view returns (address);

    /// @notice Transfers the ownership of an NFT from one address to another address
    /// @dev Throws unless `msg.sender` is the current owner, an authorized
    ///  operator, or the approved address for this NFT. Throws if `_from` is
    ///  not the current owner. Throws if `_to` is the zero address. Throws if
    ///  `_tokenId` is not a valid NFT. When transfer is complete, this function
    ///  checks if `_to` is a smart contract (code size > 0). If so, it calls
    ///  `onERC721Received` on `_to` and throws if the return value is not
    ///  `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`.
    /// @param _from The current owner of the NFT
    /// @param _to The new owner
    /// @param _tokenId The NFT to transfer
    /// @param data Additional data with no specified format, sent in call to `_to`
    function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) external;

    /// @notice Transfers the ownership of an NFT from one address to another address
    /// @dev This works identically to the other function with an extra data parameter,
    ///  except this function just sets data to "".
    /// @param _from The current owner of the NFT
    /// @param _to The new owner
    /// @param _tokenId The NFT to transfer
    function safeTransferFrom(address _from, address _to, uint256 _tokenId) external;

    /// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
    ///  TO CONFIRM THAT `_to` IS CAPABLE OF RECEIVING NFTS OR ELSE
    ///  THEY MAY BE PERMANENTLY LOST
    /// @dev Throws unless `msg.sender` is the current owner, an authorized
    ///  operator, or the approved address for this NFT. Throws if `_from` is
    ///  not the current owner. Throws if `_to` is the zero address. Throws if
    ///  `_tokenId` is not a valid NFT.
    /// @param _from The current owner of the NFT
    /// @param _to The new owner
    /// @param _tokenId The NFT to transfer
    function transferFrom(address _from, address _to, uint256 _tokenId) external;

    /// @notice Change or reaffirm the approved address for an NFT
    /// @dev The zero address indicates there is no approved address.
    ///  Throws unless `msg.sender` is the current NFT owner, or an authorized
    ///  operator of the current owner.
    /// @param _approved The new approved NFT controller
    /// @param _tokenId The NFT to approve
    function approve(address _approved, uint256 _tokenId) external;

    /// @notice Enable or disable approval for a third party ("operator") to manage
    ///  all of `msg.sender`'s assets
    /// @dev Emits the ApprovalForAll event. The contract MUST allow
    ///  multiple operators per owner.
    /// @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 Get the approved address for a single NFT
    /// @dev Throws if `_tokenId` is not a valid NFT.
    /// @param _tokenId The NFT to find the approved address for
    /// @return The approved address for this NFT, or the zero address if there is none
    function getApproved(uint256 _tokenId) external view returns (address);

    /// @notice Query if an address is an authorized operator for another address
    /// @param _owner The address that owns the NFTs
    /// @param _operator The address that acts on behalf of the owner
    /// @return True if `_operator` is an approved operator for `_owner`, false otherwise
    function isApprovedForAll(address _owner, address _operator) external view returns (bool);
}

///  Note: the ERC-165 identifier for this interface is 0x780e9d63.
interface ERC721Enumerable /* is ERC721 */ {
    /// @notice Count NFTs tracked by this contract
    /// @return A count of valid NFTs tracked by this contract, where each one of
    ///  them has an assigned and queryable owner not equal to the zero address
    function totalSupply() external view returns (uint256);

    /// @notice Enumerate valid NFTs
    /// @dev Throws if `_index` >= `totalSupply()`.
    /// @param _index A counter less than `totalSupply()`
    /// @return The token identifier for the `_index`th NFT,
    ///  (sort order not specified)
    function tokenByIndex(uint256 _index) external view returns (uint256);

    /// @notice Enumerate NFTs assigned to an owner
    /// @dev Throws if `_index` >= `balanceOf(_owner)` or if
    ///  `_owner` is the zero address, representing invalid NFTs.
    /// @param _owner An address where we are interested in NFTs owned by them
    /// @param _index A counter less than `balanceOf(_owner)`
    /// @return The token identifier for the `_index`th NFT assigned to `_owner`,
    ///   (sort order not specified)
    function tokenOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256);
}

///  Note: the ERC-165 identifier for this interface is 0x5b5e139f.
interface ERC721Metadata /* is ERC721 */ {
  /// @notice A descriptive name for a collection of NFTs in this contract
  function name() external view returns (string _name);

  /// @notice An abbreviated name for NFTs in this contract
  function symbol() external view returns (string _symbol);

  /// @notice A distinct Uniform Resource Identifier (URI) for a given asset.
  /// @dev Throws if `_tokenId` is not a valid NFT. URIs are defined in RFC
  ///  3986. The URI may point to a JSON file that conforms to the "ERC721
  ///  Metadata JSON Schema".
  function tokenURI(uint256 _tokenId) external view returns (string);
}

/// @dev Note: the ERC-165 identifier for this interface is 0x150b7a02.
interface ERC721TokenReceiver {
    /// @notice Handle the receipt of an NFT
    /// @dev The ERC721 smart contract calls this function on the recipient
    ///  after a `transfer`. 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)"))`
    ///  unless throwing
    function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes _data) external returns(bytes4);
}

/**
 * @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;
  }
}

/**
 * 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;
  }

}
 
library UrlStr {
  
  // generate url by tokenId
  // baseUrl must end with 00000000
  function generateUrl(string url,uint256 _tokenId) internal pure returns (string _url){
    _url = url;
    bytes memory _tokenURIBytes = bytes(_url);
    uint256 base_len = _tokenURIBytes.length - 1;
    _tokenURIBytes[base_len - 7] = byte(48 + _tokenId / 10000000 % 10);
    _tokenURIBytes[base_len - 6] = byte(48 + _tokenId / 1000000 % 10);
    _tokenURIBytes[base_len - 5] = byte(48 + _tokenId / 100000 % 10);
    _tokenURIBytes[base_len - 4] = byte(48 + _tokenId / 10000 % 10);
    _tokenURIBytes[base_len - 3] = byte(48 + _tokenId / 1000 % 10);
    _tokenURIBytes[base_len - 2] = byte(48 + _tokenId / 100 % 10);
    _tokenURIBytes[base_len - 1] = byte(48 + _tokenId / 10 % 10);
    _tokenURIBytes[base_len - 0] = byte(48 + _tokenId / 1 % 10);
  }
}

/**
 * @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) {
    if (a == 0) {
      return 0;
    }
    uint256 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 c;
  }

  /**
  * @dev Substracts 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) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}
 
/**
 * @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;
  }
}

/**
 * @title Operator
 * @dev Allow two roles: 'owner' or 'operator'
 *      - owner: admin/superuser (e.g. with financial rights)
 *      - operator: can update configurations
 */
contract Operator is Ownable {
    address[] public operators;

    uint public MAX_OPS = 20; // Default maximum number of operators allowed

    mapping(address => bool) public isOperator;

    event OperatorAdded(address operator);
    event OperatorRemoved(address operator);

    // @dev Throws if called by any non-operator account. Owner has all ops rights.
    modifier onlyOperator() {
        require(
            isOperator[msg.sender] || msg.sender == owner,
            "Permission denied. Must be an operator or the owner."
        );
        _;
    }

    /**
     * @dev Allows the current owner or operators to add operators
     * @param _newOperator New operator address
     */
    function addOperator(address _newOperator) public onlyOwner {
        require(
            _newOperator != address(0),
            "Invalid new operator address."
        );

        // Make sure no dups
        require(
            !isOperator[_newOperator],
            "New operator exists."
        );

        // Only allow so many ops
        require(
            operators.length < MAX_OPS,
            "Overflow."
        );

        operators.push(_newOperator);
        isOperator[_newOperator] = true;

        emit OperatorAdded(_newOperator);
    }

    /**
     * @dev Allows the current owner or operators to remove operator
     * @param _operator Address of the operator to be removed
     */
    function removeOperator(address _operator) public onlyOwner {
        // Make sure operators array is not empty
        require(
            operators.length > 0,
            "No operator."
        );

        // Make sure the operator exists
        require(
            isOperator[_operator],
            "Not an operator."
        );

        // Manual array manipulation:
        // - replace the _operator with last operator in array
        // - remove the last item from array
        address lastOperator = operators[operators.length - 1];
        for (uint i = 0; i < operators.length; i++) {
            if (operators[i] == _operator) {
                operators[i] = lastOperator;
            }
        }
        operators.length -= 1; // remove the last element

        isOperator[_operator] = false;
        emit OperatorRemoved(_operator);
    }

    // @dev Remove ALL operators
    function removeAllOps() public onlyOwner {
        for (uint i = 0; i < operators.length; i++) {
            isOperator[operators[i]] = false;
        }
        operators.length = 0;
    }
}
 
contract Pausable is Operator {

  event FrozenFunds(address target, bool frozen);

  bool public isPaused = false;
  
  mapping(address => bool)  frozenAccount;

  modifier whenNotPaused {
    require(!isPaused);
    _;
  }

  modifier whenPaused {
    require(isPaused);
    _;  
  }

  modifier whenNotFreeze(address _target) {
    require(_target != address(0));
    require(!frozenAccount[_target]);
    _;
  }

  function isFrozen(address _target) external view returns (bool) {
    require(_target != address(0));
    return frozenAccount[_target];
  }

  function doPause() external  whenNotPaused onlyOwner {
    isPaused = true;
  }

  function doUnpause() external  whenPaused onlyOwner {
    isPaused = false;
  }

  function freezeAccount(address _target, bool _freeze) public onlyOwner {
    require(_target != address(0));
    frozenAccount[_target] = _freeze;
    emit FrozenFunds(_target, _freeze);
  }

}

contract ERC721BasicToken is SupportsInterfaceWithLookup, ERC721, Pausable{

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

  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 public 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;

  /**
   * @dev Guarantees msg.sender is owner of the given token
   * @param _tokenId uint256 ID of the token to validate its ownership belongs to msg.sender
   */
  modifier onlyOwnerOf(uint256 _tokenId) {
    require(_ownerOf(_tokenId) == msg.sender,"This token not owned by this address");
    _;
  }
  
  function _ownerOf(uint256 _tokenId) internal view returns(address) {
    address _owner = tokenOwner[_tokenId];
    require(_owner != address(0),"Token not exist");
    return _owner;
  }

  /**
   * @dev Checks msg.sender can transfer a token, by being owner, approved, or operator
   * @param _tokenId uint256 ID of the token to validate
   */
  modifier canTransfer(uint256 _tokenId) {
    require(isApprovedOrOwner(msg.sender, _tokenId), "This address have no permisstion");
    _;
  }

  constructor()
    public
  {
    // register the supported interfaces to conform to ERC721 via ERC165
    _registerInterface(InterfaceId_ERC721);
    _registerInterface(InterfaceId_ERC721Exists);
    _registerInterface(ERC721_RECEIVED);
  }

  /**
   * @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) external 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) external view returns (address) {
    return _ownerOf(_tokenId);
  }

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

  /**
   * @dev 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) external whenNotPaused {
    address _owner = _ownerOf(_tokenId);
    require(_to != _owner);
    require(msg.sender == _owner || operatorApprovals[_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) external 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) external whenNotPaused {
    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
  )
    external
    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
  )
    external
    canTransfer(_tokenId)
  {
    _transfer(_from,_to,_tokenId);
  }


  function _transfer(
    address _from,
    address _to,
    uint256 _tokenId) internal {
    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
  )
    external
    canTransfer(_tokenId)
  {
    // 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) internal {
    _transfer(_from, _to, _tokenId);
      // solium-disable-next-line arg-overflow
    require(checkAndCallSafeTransfer(_from, _to, _tokenId, _data));
  }

  function safeTransferFrom(
    address _from,
    address _to,
    uint256 _tokenId,
    bytes _data
  )
    external
    canTransfer(_tokenId)
  {
    _safeTransferFrom(_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 ||
      tokenApprovals[_tokenId] == _spender ||
      operatorApprovals[_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 whenNotPaused {
    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 whenNotPaused {
    require(tokenOwner[_tokenId] == address(0));
    require(!frozenAccount[_to]);  
    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 whenNotPaused {
    require(_ownerOf(_tokenId) == _from);
    require(!frozenAccount[_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 = ERC721TokenReceiver(_to).onERC721Received(
      msg.sender, _from, _tokenId, _data);
    return (retval == ERC721_RECEIVED);
  }
}
 
contract ERC721ExtendToken is ERC721BasicToken, ERC721Enumerable, ERC721Metadata {

  using UrlStr for string;

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

  bytes4 public constant InterfaceId_ERC721Metadata = 0x5b5e139f;
  /**
   * 0x5b5e139f ===
   *   bytes4(keccak256('name()')) ^
   *   bytes4(keccak256('symbol()')) ^
   *   bytes4(keccak256('tokenURI(uint256)'))
   */
  string internal BASE_URL = "https://www.bitguild.com/bitizens/api/lambo/getCarInfo/00000000";

  // 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;

  function updateBaseURI(string _url) external onlyOwner {
    BASE_URL = _url;
  }
  
  /**
   * @dev Constructor function
   */
  constructor() public {
    // 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 "Bitizen Lambo";
  }

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

  /**
   * @dev Returns an URI for a given token ID
   * Throws if the token ID does not exist. May return an empty string.
   * @param _tokenId uint256 ID of the token to query
   */
  function tokenURI(uint256 _tokenId) external view returns (string) {
    require(exists(_tokenId));
    return BASE_URL.generateUrl(_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(address(0)!=_owner);
    require(_index < ownedTokensCount[_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 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 whenNotPaused {
    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 whenNotPaused {
    super.removeTokenFrom(_from, _tokenId);

    uint256 tokenIndex = ownedTokensIndex[_tokenId];
    uint256 lastTokenIndex = ownedTokens[_from].length.sub(1);
    uint256 lastToken = ownedTokens[_from][lastTokenIndex];

    ownedTokens[_from][tokenIndex] = lastToken;
    ownedTokens[_from][lastTokenIndex] = 0;
    // 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

    ownedTokens[_from].length--;
    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);
    

    // 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;
  }
}

interface BitizenCarService {
  function isBurnedCar(uint256 _carId) external view returns (bool);
  function getOwnerCars(address _owner) external view returns(uint256[]);
  function getBurnedCarIdByIndex(uint256 _index) external view returns (uint256);
  function getCarInfo(uint256 _carId) external view returns(string, uint8, uint8);
  function createCar(address _owner, string _foundBy, uint8 _type, uint8 _ext) external returns(uint256);
  function updateCar(uint256 _carId, string _newFoundBy, uint8 _newType, uint8 _ext) external;
  function burnCar(address _owner, uint256 _carId) external;
}

contract BitizenCarToken is ERC721ExtendToken {
  
  enum CarHandleType{CREATE_CAR, UPDATE_CAR, BURN_CAR}

  event TransferStateChanged(address indexed _owner, bool _state);
  
  event CarHandleEvent(address indexed _owner, uint256 indexed _carId, CarHandleType _type);

  struct BitizenCar{
    string foundBy; // founder name
    uint8 carType;  // car type
    uint8 ext;      // for future
  }
 
  // car id index
  uint256 internal carIndex = 0;

  // car id => car 
  mapping (uint256 => BitizenCar) carInfos;

  // all the burned car id
  uint256[] internal burnedCars;

  // check car id => isBurned
  mapping(uint256 => bool) internal isBurned;

  // add a switch to handle transfer
  bool public carTransferState = false;

  modifier validCar(uint256 _carId) {
    require(_carId > 0 && _carId <= carIndex, "invalid car");
    _;
  }

  function changeTransferState(bool _newState) public onlyOwner {
    if(carTransferState == _newState) return;
    carTransferState = _newState;
    emit TransferStateChanged(owner, carTransferState);
  }

  function isBurnedCar(uint256 _carId) external view validCar(_carId) returns (bool) {
    return isBurned[_carId];
  }

  function getBurnedCarCount() external view returns (uint256) {
    return burnedCars.length;
  }

  function getBurnedCarIdByIndex(uint256 _index) external view returns (uint256) {
    require(_index < burnedCars.length, "out of boundary");
    return burnedCars[_index];
  }

  function getCarInfo(uint256 _carId) external view validCar(_carId) returns(string, uint8, uint8)  {
    BitizenCar storage car = carInfos[_carId];
    return(car.foundBy, car.carType, car.ext);
  }

  function getOwnerCars(address _owner) external view onlyOperator returns(uint256[]) {
    require(_owner != address(0));
    return ownedTokens[_owner];
  }

  function createCar(address _owner, string _foundBy, uint8 _type, uint8 _ext) external onlyOperator returns(uint256) {
    require(_owner != address(0));
    BitizenCar memory car = BitizenCar(_foundBy, _type, _ext);
    uint256 carId = ++carIndex;
    carInfos[carId] = car;
    _mint(_owner, carId);
    emit CarHandleEvent(_owner, carId, CarHandleType.CREATE_CAR);
    return carId;
  }

  function updateCar(uint256 _carId, string _newFoundBy, uint8 _type, uint8 _ext) external onlyOperator {
    require(exists(_carId));
    BitizenCar storage car = carInfos[_carId];
    car.foundBy = _newFoundBy;
    car.carType = _type;
    car.ext = _ext;
    emit CarHandleEvent(_ownerOf(_carId), _carId, CarHandleType.UPDATE_CAR);
  }

  function burnCar(address _owner, uint256 _carId) external onlyOperator {
    burnedCars.push(_carId);
    isBurned[_carId] = true;
    _burn(_owner, _carId);
    emit CarHandleEvent(_owner, _carId, CarHandleType.BURN_CAR);
  }

  // override
  // add transfer condition
  function _transfer(address _from,address _to,uint256 _tokenId) internal {
    require(carTransferState == true, "not allown transfer at current time");
    super._transfer(_from, _to, _tokenId);
  }
  
  function () public payable {
    revert();
  }
}

Contract Security Audit

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Contract ABI

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Contract Creation Code

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bzzr://d7b79bf41ed385e54b8f92371e0f6b812e89e5e5f8720bf7bb5ee78867595f54

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Multichain Portfolio | 30 Chains

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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.

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