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Contract

0x53E3A7EC57132173Ce615dEBb9A303fD2cd86789
 

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0 ETH

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$0.00

Token Holdings

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Method
Block
From
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Approve63195792018-09-12 18:31:292189 days ago1536777089IN
CryptoCities
0 ETH0.000228455
Transfer57837862018-06-13 21:27:422280 days ago1528925262IN
CryptoCities
0 ETH0.000093952
Transfer57837812018-06-13 21:26:382280 days ago1528925198IN
CryptoCities
0 ETH0.000123952
Transfer57558172018-06-08 22:55:572285 days ago1528498557IN
CryptoCities
0 ETH0.000184576
Transfer57558152018-06-08 22:55:142285 days ago1528498514IN
CryptoCities
0 ETH0.000364576
Approve55439432018-05-02 14:33:102323 days ago1525271590IN
CryptoCities
0 ETH0.000091382
Approve55341242018-04-30 20:52:132324 days ago1525121533IN
CryptoCities
0 ETH0.000137073
Approve54920342018-04-23 13:48:442332 days ago1524491324IN
CryptoCities
0 ETH0.000061382
Approve54582382018-04-17 18:37:432337 days ago1523990263IN
CryptoCities
0 ETH0.00003591.17
Approve54582172018-04-17 18:32:422337 days ago1523989962IN
CryptoCities
0 ETH0.000091382
Approve53249962018-03-26 11:35:462360 days ago1522064146IN
CryptoCities
0 ETH0.000122764
Approve53249012018-03-26 11:16:392360 days ago1522062999IN
CryptoCities
0 ETH0.000182764
Approve53069242018-03-23 11:34:382363 days ago1521804878IN
CryptoCities
0 ETH0.000045691
Approve52978022018-03-21 23:07:362364 days ago1521673656IN
CryptoCities
0 ETH0.000045691
Approve52718402018-03-17 14:33:582369 days ago1521297238IN
CryptoCities
0 ETH0.000095942.1
Approve52683892018-03-17 0:07:272369 days ago1521245247IN
CryptoCities
0 ETH0.000122764
Approve52664472018-03-16 16:13:512370 days ago1521216831IN
CryptoCities
0 ETH0.000091382
Approve52501352018-03-13 21:38:312372 days ago1520977111IN
CryptoCities
0 ETH0.000091382
Approve52188032018-03-08 13:45:342378 days ago1520516734IN
CryptoCities
0 ETH0.000182764
Payout52095872018-03-07 0:19:002379 days ago1520381940IN
CryptoCities
0 ETH0.0023043241
Approve52086572018-03-06 20:32:002379 days ago1520368320IN
CryptoCities
0 ETH0.000091382
Approve51817812018-03-02 7:28:212384 days ago1519975701IN
CryptoCities
0 ETH0.000182764
Approve51721072018-02-28 15:40:252386 days ago1519832425IN
CryptoCities
0 ETH0.000182764
Approve51671922018-02-27 19:41:102386 days ago1519760470IN
CryptoCities
0 ETH0.0005182111.342
Transfer51599032018-02-26 13:58:272388 days ago1519653507IN
CryptoCities
0 ETH0.0006197810
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52095872018-03-07 0:19:002379 days ago1520381940
CryptoCities
24.13925708 ETH
51439992018-02-23 20:38:572390 days ago1519418337
CryptoCities
0.00149723 ETH
51439992018-02-23 20:38:572390 days ago1519418337
CryptoCities
0.67539259 ETH
51438592018-02-23 20:11:102390 days ago1519416670
CryptoCities
0.6225004 ETH
51438592018-02-23 20:11:102390 days ago1519416670
CryptoCities
0.61270782 ETH
51438592018-02-23 20:11:102390 days ago1519416670
CryptoCities
0.61070386 ETH
51438572018-02-23 20:10:502390 days ago1519416650
CryptoCities
0.59917359 ETH
51438572018-02-23 20:10:502390 days ago1519416650
CryptoCities
0.59440672 ETH
51438562018-02-23 20:10:162390 days ago1519416616
CryptoCities
0.59143734 ETH
51438562018-02-23 20:10:162390 days ago1519416616
CryptoCities
0.5896451 ETH
51438562018-02-23 20:10:162390 days ago1519416616
CryptoCities
0.57367684 ETH
51438562018-02-23 20:10:162390 days ago1519416616
CryptoCities
0.54029603 ETH
51438152018-02-23 20:01:042390 days ago1519416064
CryptoCities
0.00021698 ETH
51438152018-02-23 20:01:042390 days ago1519416064
CryptoCities
0.54029603 ETH
51437182018-02-23 19:37:322390 days ago1519414652
CryptoCities
0.82366515 ETH
51437072018-02-23 19:34:282390 days ago1519414468
CryptoCities
0.00221185 ETH
51437072018-02-23 19:34:282390 days ago1519414468
CryptoCities
0.61832085 ETH
51436552018-02-23 19:23:012390 days ago1519413781
CryptoCities
0.92972526 ETH
51436512018-02-23 19:21:582390 days ago1519413718
CryptoCities
1.03375082 ETH
51435952018-02-23 19:08:462390 days ago1519412926
CryptoCities
1.31435929 ETH
51435892018-02-23 19:07:362390 days ago1519412856
CryptoCities
0.95481115 ETH
51435472018-02-23 18:58:372390 days ago1519412317
CryptoCities
1.9278063 ETH
51435332018-02-23 18:56:152390 days ago1519412175
CryptoCities
1.23549773 ETH
51435312018-02-23 18:55:572390 days ago1519412157
CryptoCities
1.83188726 ETH
51435252018-02-23 18:55:092390 days ago1519412109
CryptoCities
0.52905753 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
CityToken

Compiler Version
v0.4.19+commit.c4cbbb05

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-02-09
*/

pragma solidity ^0.4.18; // solhint-disable-line

/// @title Interface for contracts conforming to ERC-721: Non-Fungible Tokens
/// @author Dieter Shirley <[email protected]> (https://github.com/dete)
contract ERC721 {
  // Required methods
  function approve(address _to, uint256 _tokenId) public;
  function balanceOf(address _owner) public view returns (uint256 balance);
  function implementsERC721() public pure returns (bool);
  function ownerOf(uint256 _tokenId) public view returns (address addr);
  function takeOwnership(uint256 _tokenId) public;
  function totalSupply() public view returns (uint256 total);
  function transferFrom(address _from, address _to, uint256 _tokenId) public;
  function transfer(address _to, uint256 _tokenId) public;

  event Transfer(address indexed from, address indexed to, uint256 tokenId);
  event Approval(address indexed owner, address indexed approved, uint256 tokenId);

  // Optional
  // function name() public view returns (string name);
  // function symbol() public view returns (string symbol);
  // function tokenOfOwnerByIndex(address _owner, uint256 _index) external view returns (uint256 tokenId);
  // function tokenMetadata(uint256 _tokenId) public view returns (string infoUrl);
}


contract CityToken is ERC721 {

  /*** EVENTS ***/

  /// @dev The CityCreated event is fired whenever a new city comes into existence.
  event CityCreated(uint256 tokenId, string name, string country, address owner);

  /// @dev The TokenSold event is fired whenever a token is sold.
  event TokenSold(uint256 tokenId, uint256 oldPrice, uint256 newPrice, address prevOwner, address winner, string name, string country);

  /// @dev Transfer event as defined in current draft of ERC721. 
  ///  ownership is assigned, including create event.
  event Transfer(address from, address to, uint256 tokenId);

  /*** CONSTANTS ***/

  /// @notice Name and symbol of the non fungible token, as defined in ERC721.
  string public constant NAME = "CryptoCities"; // solhint-disable-line
  string public constant SYMBOL = "CityToken"; // solhint-disable-line

  uint256 private startingPrice = 0.05 ether;

  uint256 private constant PROMO_CREATION_LIMIT = 5000;

  /*** STORAGE ***/

  /// @dev A mapping from city IDs to the address that owns them. All cities have
  ///  some valid owner address.
  mapping (uint256 => address) public cityIndexToOwner;

  // @dev A mapping from owner address to count of tokens that address owns.
  //  Used internally inside balanceOf() to resolve ownership count.
  mapping (address => uint256) private ownershipTokenCount;

  /// @dev A mapping from CityIDs to an address that has been approved to call
  ///  transferFrom(). Each City can only have one approved address for transfer
  ///  at any time. A zero value means no approval is outstanding.
  mapping (uint256 => address) public cityIndexToApproved;

  // @dev A mapping from CityIDs to the price of the token.
  mapping (uint256 => uint256) private cityIndexToPrice;

  // The addresses of the accounts (or contracts) that can execute actions within each roles.
  address public ceoAddress;
  address public cooAddress;

  uint256 public promoCreatedCount;

  /*** DATATYPES ***/
  struct City {
    string name;
    string country;
  }

  City[] private cities;

  /*** ACCESS MODIFIERS ***/
  /// @dev Access modifier for CEO-only functionality
  modifier onlyCEO() {
    require(msg.sender == ceoAddress);
    _;
  }

  /// @dev Access modifier for COO-only functionality
  modifier onlyCOO() {
    require(msg.sender == cooAddress);
    _;
  }

  /// Access modifier for contract owner only functionality
  modifier onlyCLevel() {
    require(
      msg.sender == ceoAddress ||
      msg.sender == cooAddress
    );
    _;
  }

  /*** CONSTRUCTOR ***/
  function CityToken() public {
    ceoAddress = msg.sender;
    cooAddress = msg.sender;
  }

  /*** PUBLIC FUNCTIONS ***/
  /// @notice Grant another address the right to transfer token via takeOwnership() and transferFrom().
  /// @param _to The address to be granted transfer approval. Pass address(0) to
  ///  clear all approvals.
  /// @param _tokenId The ID of the Token that can be transferred if this call succeeds.
  /// @dev Required for ERC-721 compliance.
  function approve(
    address _to,
    uint256 _tokenId
  ) public {
    // Caller must own token.
    require(_owns(msg.sender, _tokenId));

    cityIndexToApproved[_tokenId] = _to;

    Approval(msg.sender, _to, _tokenId);
  }

  /// For querying balance of a particular account
  /// @param _owner The address for balance query
  /// @dev Required for ERC-721 compliance.
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return ownershipTokenCount[_owner];
  }

  /// @dev Creates a new promo City with the given name, country and price and assignes it to an address.
  function createPromoCity(address _owner, string _name, string _country, uint256 _price) public onlyCOO {
    require(promoCreatedCount < PROMO_CREATION_LIMIT);

    address cityOwner = _owner;
    if (cityOwner == address(0)) {
      cityOwner = cooAddress;
    }
    
    if (_price <= 0) {
      _price = startingPrice;
    }

    promoCreatedCount++;
    _createCity(_name, _country, cityOwner, _price);
  }

  /// @dev Creates a new City with the given name and country.
  function createContractCity(string _name, string _country) public onlyCOO {
    _createCity(_name, _country, address(this), startingPrice);
  }

  /// @notice Returns all the relevant information about a specific city.
  /// @param _tokenId The tokenId of the city of interest.
  function getCity(uint256 _tokenId) public view returns (
    string cityName,
    string country,
    uint256 sellingPrice,
    address owner
  ) {
    City storage city = cities[_tokenId];
    cityName = city.name;
    country = city.country;
    sellingPrice = cityIndexToPrice[_tokenId];
    owner = cityIndexToOwner[_tokenId];
  }

  function implementsERC721() public pure returns (bool) {
    return true;
  }

  /// @dev Required for ERC-721 compliance.
  function name() public pure returns (string) {
    return NAME;
  }

  /// For querying owner of token
  /// @param _tokenId The tokenID for owner inquiry
  /// @dev Required for ERC-721 compliance.
  function ownerOf(uint256 _tokenId)
    public
    view
    returns (address owner)
  {
    owner = cityIndexToOwner[_tokenId];
    require(owner != address(0));
  }

  function payout(address _to) public onlyCLevel {
    _payout(_to);
  }

  // Allows someone to send ether and obtain the token
  function purchase(uint256 _tokenId) public payable {
    address oldOwner = cityIndexToOwner[_tokenId];
    address newOwner = msg.sender;

    uint256 sellingPrice = cityIndexToPrice[_tokenId];

    // Making sure token owner is not sending to self
    require(oldOwner != newOwner);

    // Safety check to prevent against an unexpected 0x0 default.
    require(_addressNotNull(newOwner));

    // Making sure sent amount is greater than or equal to the sellingPrice
    require(msg.value >= sellingPrice);

    uint256 payment = uint256(SafeMath.div(SafeMath.mul(sellingPrice, 94), 100));
    uint256 purchaseExcess = SafeMath.sub(msg.value, sellingPrice);

    // Update price (20% increase)
    cityIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 120), 94);
    
    _transfer(oldOwner, newOwner, _tokenId);

    // Pay previous tokenOwner if owner is not contract
    if (oldOwner != address(this)) {
      oldOwner.transfer(payment); //(1-0.10)
    }

    TokenSold(_tokenId, sellingPrice, cityIndexToPrice[_tokenId], oldOwner, newOwner, cities[_tokenId].name, cities[_tokenId].country);

    msg.sender.transfer(purchaseExcess);
  }

  function priceOf(uint256 _tokenId) public view returns (uint256 price) {
    return cityIndexToPrice[_tokenId];
  }

  /// @dev Assigns a new address to act as the CEO. Only available to the current CEO.
  /// @param _newCEO The address of the new CEO
  function setCEO(address _newCEO) public onlyCEO {
    require(_newCEO != address(0));

    ceoAddress = _newCEO;
  }

  /// @dev Assigns a new address to act as the COO. Only available to the current COO.
  /// @param _newCOO The address of the new COO
  function setCOO(address _newCOO) public onlyCEO {
    require(_newCOO != address(0));

    cooAddress = _newCOO;
  }

  /// @dev Required for ERC-721 compliance.
  function symbol() public pure returns (string) {
    return SYMBOL;
  }

  /// @notice Allow pre-approved user to take ownership of a token
  /// @param _tokenId The ID of the Token that can be transferred if this call succeeds.
  /// @dev Required for ERC-721 compliance.
  function takeOwnership(uint256 _tokenId) public {
    address newOwner = msg.sender;
    address oldOwner = cityIndexToOwner[_tokenId];

    // Safety check to prevent against an unexpected 0x0 default.
    require(_addressNotNull(newOwner));

    // Making sure transfer is approved
    require(_approved(newOwner, _tokenId));

    _transfer(oldOwner, newOwner, _tokenId);
  }

  /// @param _owner The owner whose city tokens we are interested in.
  /// @dev This method MUST NEVER be called by smart contract code. First, it's fairly
  ///  expensive (it walks the entire Cities array looking for cities belonging to owner),
  ///  but it also returns a dynamic array, which is only supported for web3 calls, and
  ///  not contract-to-contract calls.
  function tokensOfOwner(address _owner) public view returns(uint256[] ownerTokens) {
    uint256 tokenCount = balanceOf(_owner);
    if (tokenCount == 0) {
        // Return an empty array
      return new uint256[](0);
    } else {
      uint256[] memory result = new uint256[](tokenCount);
      uint256 totalCities = totalSupply();
      uint256 resultIndex = 0;

      uint256 cityId;
      for (cityId = 0; cityId <= totalCities; cityId++) {
        if (cityIndexToOwner[cityId] == _owner) {
          result[resultIndex] = cityId;
          resultIndex++;
        }
      }
      return result;
    }
  }

  /// For querying totalSupply of token
  /// @dev Required for ERC-721 compliance.
  function totalSupply() public view returns (uint256 total) {
    return cities.length;
  }

  /// Owner initates the transfer of the token to another account
  /// @param _to The address for the token to be transferred to.
  /// @param _tokenId The ID of the Token that can be transferred if this call succeeds.
  /// @dev Required for ERC-721 compliance.
  function transfer(
    address _to,
    uint256 _tokenId
  ) public {
    require(_owns(msg.sender, _tokenId));
    require(_addressNotNull(_to));

    _transfer(msg.sender, _to, _tokenId);
  }

  /// Third-party initiates transfer of token from address _from to address _to
  /// @param _from The address for the token to be transferred from.
  /// @param _to The address for the token to be transferred to.
  /// @param _tokenId The ID of the Token that can be transferred if this call succeeds.
  /// @dev Required for ERC-721 compliance.
  function transferFrom(
    address _from,
    address _to,
    uint256 _tokenId
  ) public {
    require(_owns(_from, _tokenId));
    require(_approved(_to, _tokenId));
    require(_addressNotNull(_to));

    _transfer(_from, _to, _tokenId);
  }

  /*** PRIVATE FUNCTIONS ***/
  /// Safety check on _to address to prevent against an unexpected 0x0 default.
  function _addressNotNull(address _to) private pure returns (bool) {
    return _to != address(0);
  }

  /// For checking approval of transfer for address _to
  function _approved(address _to, uint256 _tokenId) private view returns (bool) {
    return cityIndexToApproved[_tokenId] == _to;
  }

  /// For creating City
  function _createCity(string _name, string _country, address _owner, uint256 _price) private {
    City memory _city = City({
      name: _name,
      country: _country
    });
    uint256 newCityId = cities.push(_city) - 1;

    // It's probably never going to happen, 4 billion tokens are A LOT, but
    // let's just be 100% sure we never let this happen.
    require(newCityId == uint256(uint32(newCityId)));

    CityCreated(newCityId, _name, _country, _owner);

    cityIndexToPrice[newCityId] = _price;

    // This will assign ownership, and also emit the Transfer event as
    // per ERC721 draft
    _transfer(address(0), _owner, newCityId);
  }

  /// Check for token ownership
  function _owns(address claimant, uint256 _tokenId) private view returns (bool) {
    return claimant == cityIndexToOwner[_tokenId];
  }

  /// For paying out balance on contract
  function _payout(address _to) private {
    if (_to == address(0)) {
      ceoAddress.transfer(this.balance);
    } else {
      _to.transfer(this.balance);
    }
  }

  /// @dev Assigns ownership of a specific City to an address.
  function _transfer(address _from, address _to, uint256 _tokenId) private {
    // Since the number of cities is capped to 2^32 we can't overflow this
    ownershipTokenCount[_to]++;
    //transfer ownership
    cityIndexToOwner[_tokenId] = _to;

    // When creating new cities _from is 0x0, but we can't account that address.
    if (_from != address(0)) {
      ownershipTokenCount[_from]--;
      // clear any previously approved ownership exchange
      delete cityIndexToApproved[_tokenId];
    }

    // Emit the transfer event.
    Transfer(_from, _to, _tokenId);
  }
}
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;
  }
}

Contract Security Audit

Contract ABI

[{"constant":true,"inputs":[],"name":"promoCreatedCount","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_tokenId","type":"uint256"}],"name":"approve","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"ceoAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"}],"name":"payout","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"implementsERC721","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"total","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"cityIndexToOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newCEO","type":"address"}],"name":"setCEO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newCOO","type":"address"}],"name":"setCOO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"name":"owner","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"tokensOfOwner","outputs":[{"name":"ownerTokens","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":false,"inputs":[{"name":"_owner","type":"address"},{"name":"_name","type":"string"},{"name":"_country","type":"string"},{"name":"_price","type":"uint256"}],"name":"createPromoCity","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"NAME","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_tokenId","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"cooAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"takeOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"priceOf","outputs":[{"name":"price","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"string"},{"name":"_country","type":"string"}],"name":"createContractCity","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"getCity","outputs":[{"name":"cityName","type":"string"},{"name":"country","type":"string"},{"name":"sellingPrice","type":"uint256"},{"name":"owner","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"cityIndexToApproved","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"purchase","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"SYMBOL","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"tokenId","type":"uint256"},{"indexed":false,"name":"name","type":"string"},{"indexed":false,"name":"country","type":"string"},{"indexed":false,"name":"owner","type":"address"}],"name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bzzr://71eba0c0c6147d6a6837175f255084ae2f51a9ac97bca6c2caefdfd944bf6de1

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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.