ETH Price: $2,228.85 (-2.02%)
 

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ETH Balance

0.260398611766370729 ETH

Eth Value

$580.39 (@ $2,228.85/ETH)

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Transaction Hash
Method
Block
From
To
Withdraw Rent222276982025-04-09 0:14:47301 days ago1744157687IN
0x0c507D48...Cfc6442Db
0 ETH0.000027090.98441152
Update Payout222276942025-04-09 0:13:59301 days ago1744157639IN
0x0c507D48...Cfc6442Db
0 ETH0.000148290.92500419
Purchase Country68966342018-12-16 10:13:312607 days ago1544955211IN
0x0c507D48...Cfc6442Db
0 ETH0.0025
Withdraw Rent67497112018-11-22 4:47:182631 days ago1542862038IN
0x0c507D48...Cfc6442Db
0 ETH0.000254086
Withdraw Rent66983672018-11-13 18:35:422639 days ago1542134142IN
0x0c507D48...Cfc6442Db
0 ETH0.000169394
Purchase Country66583422018-11-07 5:27:512646 days ago1541568471IN
0x0c507D48...Cfc6442Db
0.04665403 ETH0.000900655
Purchase Country66556172018-11-06 18:39:192646 days ago1541529559IN
0x0c507D48...Cfc6442Db
0 ETH0.00287
Purchase Country66555942018-11-06 18:33:462646 days ago1541529226IN
0x0c507D48...Cfc6442Db
0 ETH0.0025
Withdraw Rent53390692018-03-28 20:34:572869 days ago1522269297IN
0x0c507D48...Cfc6442Db
0 ETH0.000098092
Withdraw Rent53041752018-03-23 0:34:352875 days ago1521765275IN
0x0c507D48...Cfc6442Db
0 ETH0.000069851.01
Withdraw Rent52971322018-03-21 20:31:382876 days ago1521664298IN
0x0c507D48...Cfc6442Db
0 ETH0.000031.1
Withdraw Rent52733232018-03-17 20:25:442880 days ago1521318344IN
0x0c507D48...Cfc6442Db
0 ETH0.000092071.7
Withdraw Rent52733212018-03-17 20:25:292880 days ago1521318329IN
0x0c507D48...Cfc6442Db
0 ETH0.000046361.7
Withdraw Rent52733212018-03-17 20:25:292880 days ago1521318329IN
0x0c507D48...Cfc6442Db
0 ETH0.000046361.7
Withdraw Rent52728872018-03-17 18:43:442880 days ago1521312224IN
0x0c507D48...Cfc6442Db
0 ETH0.000182593
Withdraw Rent52589352018-03-15 9:46:282883 days ago1521107188IN
0x0c507D48...Cfc6442Db
0 ETH0.000245245
Withdraw Rent52329332018-03-10 23:28:522887 days ago1520724532IN
0x0c507D48...Cfc6442Db
0 ETH0.000122652.2
Purchase Country52311052018-03-10 15:53:422887 days ago1520697222IN
0x0c507D48...Cfc6442Db
0 ETH0.0025
Withdraw Rent52196322018-03-08 17:05:272889 days ago1520528727IN
0x0c507D48...Cfc6442Db
0 ETH0.000151472
Withdraw Rent52046392018-03-06 4:06:402892 days ago1520309200IN
0x0c507D48...Cfc6442Db
0 ETH0.000196194
Withdraw Rent51989492018-03-05 4:48:502893 days ago1520225330IN
0x0c507D48...Cfc6442Db
0 ETH0.000136194
Withdraw Rent51987732018-03-05 4:04:122893 days ago1520222652IN
0x0c507D48...Cfc6442Db
0 ETH0.000284335.1
Withdraw Rent51975932018-03-04 23:26:432893 days ago1520206003IN
0x0c507D48...Cfc6442Db
0 ETH0.000196194
Withdraw Rent51974122018-03-04 22:43:392893 days ago1520203419IN
0x0c507D48...Cfc6442Db
0 ETH0.000068092
Withdraw Rent51974102018-03-04 22:43:162893 days ago1520203396IN
0x0c507D48...Cfc6442Db
0 ETH0.00011152
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Latest 25 internal transactions (View All)

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Parent Transaction Hash Method Block
From
To
Transfer236563672025-10-25 18:49:11101 days ago1761418151
0x0c507D48...Cfc6442Db
0.00225377 ETH
Transfer66583422018-11-07 5:27:512646 days ago1541568471
0x0c507D48...Cfc6442Db
0.04280507 ETH
Transfer53390692018-03-28 20:34:572869 days ago1522269297
0x0c507D48...Cfc6442Db
0.00307444 ETH
Transfer53041752018-03-23 0:34:352875 days ago1521765275
0x0c507D48...Cfc6442Db
0.00614888 ETH
Transfer52971322018-03-21 20:31:382876 days ago1521664298
0x0c507D48...Cfc6442Db
0.00148804 ETH
Transfer52733232018-03-17 20:25:442880 days ago1521318344
0x0c507D48...Cfc6442Db
0.07101276 ETH
Transfer52733212018-03-17 20:25:292880 days ago1521318329
0x0c507D48...Cfc6442Db
0.03415831 ETH
Transfer52733212018-03-17 20:25:292880 days ago1521318329
0x0c507D48...Cfc6442Db
0.01934279 ETH
Transfer52728872018-03-17 18:43:442880 days ago1521312224
0x0c507D48...Cfc6442Db
0.00341266 ETH
Transfer52589352018-03-15 9:46:282883 days ago1521107188
0x0c507D48...Cfc6442Db
0.00211817 ETH
Transfer52329332018-03-10 23:28:522887 days ago1520724532
0x0c507D48...Cfc6442Db
0.00153722 ETH
Transfer52196322018-03-08 17:05:272889 days ago1520528727
0x0c507D48...Cfc6442Db
0.00513454 ETH
Transfer52046392018-03-06 4:06:402892 days ago1520309200
0x0c507D48...Cfc6442Db
0.0076861 ETH
Transfer51989492018-03-05 4:48:502893 days ago1520225330
0x0c507D48...Cfc6442Db
0.00922332 ETH
Transfer51987732018-03-05 4:04:122893 days ago1520222652
0x0c507D48...Cfc6442Db
0.00238827 ETH
Transfer51975932018-03-04 23:26:432893 days ago1520206003
0x0c507D48...Cfc6442Db
0.00269013 ETH
Transfer51974122018-03-04 22:43:392893 days ago1520203419
0x0c507D48...Cfc6442Db
0.00317593 ETH
Transfer51974102018-03-04 22:43:162893 days ago1520203396
0x0c507D48...Cfc6442Db
0.01076054 ETH
Transfer51973222018-03-04 22:24:202893 days ago1520202260
0x0c507D48...Cfc6442Db
0.01229776 ETH
Transfer51973052018-03-04 22:19:392893 days ago1520201979
0x0c507D48...Cfc6442Db
0.03535607 ETH
Transfer51973022018-03-04 22:19:132893 days ago1520201953
0x0c507D48...Cfc6442Db
0.75887111 ETH
Transfer51972482018-03-04 22:07:362893 days ago1520201256
0x0c507D48...Cfc6442Db
0.00606644 ETH
Transfer51972442018-03-04 22:06:372893 days ago1520201197
0x0c507D48...Cfc6442Db
1.09462505 ETH
Transfer51972442018-03-04 22:06:372893 days ago1520201197
0x0c507D48...Cfc6442Db
0.00475121 ETH
Transfer51972302018-03-04 22:04:062893 days ago1520201046
0x0c507D48...Cfc6442Db
0.0203324 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
CountryToken

Compiler Version
v0.4.19+commit.c4cbbb05

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2018-02-25
*/

pragma solidity ^0.4.18;

/**
 * @title ERC721 interface
 * @dev see https://github.com/ethereum/eips/issues/721
 */
contract ERC721 {
  event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
  event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);

  function balanceOf(address _owner) public view returns (uint256 _balance);
  function ownerOf(uint256 _tokenId) public view returns (address _owner);
  function transfer(address _to, uint256 _tokenId) public;
  function approve(address _to, uint256 _tokenId) public;
  function takeOwnership(uint256 _tokenId) public;
}

/**
 * @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 OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() 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 transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  function mul(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint256 a, uint256 b) internal constant 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;
  }

  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }
  
  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

/**
 * @title ERC721Token
 * Generic implementation for the required functionality of the ERC721 standard
 */
contract CountryToken is ERC721, Ownable {
  using SafeMath for uint256;

  // Total amount of tokens
  uint256 private totalTokens;
  uint256[] private listedCountries;
  uint256 public devOwed;
  uint256 public poolTotal;
  uint256 public lastPurchase;

  // Country Data
  mapping (uint256 => Country) public countryData;

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

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

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

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

  // Balances from % payouts.
  mapping (address => uint256) private payoutBalances; 

  // Events
  event CountryPurchased(uint256 indexed _tokenId, address indexed _owner, uint256 _purchasePrice);

  // Purchasing Caps for Determining Next Pool Cut
  uint256 private firstCap  = 0.5 ether;
  uint256 private secondCap = 1.0 ether;
  uint256 private thirdCap  = 3.0 ether;
  uint256 private finalCap  = 5.0 ether;

  // Struct to store Country Data
  struct Country {
      uint256 startingPrice; // Price the item started at.
      uint256 price;         // Current price of the item.
      uint256 lastPrice;     // lastPrice this was sold for, used for adding to pool.
      uint256 payout;        // The percent of the pool rewarded.
      uint256 withdrawn;     // The amount of Eth this country has withdrawn from the pool.
      address owner;         // Current owner of the item.
  }

  /**
  * @dev createListing Adds new ERC721 Token
  * @param _tokenId uint256 ID of new token
  * @param _startingPrice uint256 starting price in wei
  * @param _payoutPercentage uint256 payout percentage (divisible by 10)
  * @param _owner address of new owner
  */
  function createListing(uint256 _tokenId, uint256 _startingPrice, uint256 _payoutPercentage, address _owner) onlyOwner() public {

    // make sure price > 0
    require(_startingPrice > 0);
    // make sure token hasn't been used yet
    require(countryData[_tokenId].price == 0);
    
    // create new token
    Country storage newCountry = countryData[_tokenId];

    newCountry.owner = _owner;
    newCountry.price = getNextPrice(_startingPrice);
    newCountry.lastPrice = _startingPrice;
    newCountry.payout = _payoutPercentage;
    newCountry.startingPrice = _startingPrice;

    // store country in storage
    listedCountries.push(_tokenId);
    
    // mint new token
    _mint(_owner, _tokenId);
  }

  function createMultiple (uint256[] _itemIds, uint256[] _prices, uint256[] _payouts, address[] _owners) onlyOwner() external {
    for (uint256 i = 0; i < _itemIds.length; i++) {
      createListing(_itemIds[i], _prices[i], _payouts[i], _owners[i]);
    }
  }

  /**
  * @dev Determines next price of token
  * @param _price uint256 ID of current price
  */
  function getNextPrice (uint256 _price) private view returns (uint256 _nextPrice) {
    if (_price < firstCap) {
      return _price.mul(200).div(95);
    } else if (_price < secondCap) {
      return _price.mul(135).div(96);
    } else if (_price < thirdCap) {
      return _price.mul(125).div(97);
    } else if (_price < finalCap) {
      return _price.mul(117).div(97);
    } else {
      return _price.mul(115).div(98);
    }
  }

  function calculatePoolCut (uint256 _price) public view returns (uint256 _poolCut) {
    if (_price < firstCap) {
      return _price.mul(10).div(100); // 5%
    } else if (_price < secondCap) {
      return _price.mul(9).div(100); // 4%
    } else if (_price < thirdCap) {
      return _price.mul(8).div(100); // 3%
    } else if (_price < finalCap) {
      return _price.mul(7).div(100); // 3%
    } else {
      return _price.mul(5).div(100); // 2%
    }
  }

  /**
  * @dev Purchase country from previous owner
  * @param _tokenId uint256 of token
  */
  function purchaseCountry(uint256 _tokenId) public 
    payable
    isNotContract(msg.sender)
  {

    // get data from storage
    Country storage country = countryData[_tokenId];
    uint256 price = country.price;
    address oldOwner = country.owner;
    address newOwner = msg.sender;
    uint256 excess = msg.value.sub(price);

    // revert checks
    require(price > 0);
    require(msg.value >= price);
    require(oldOwner != msg.sender);

    // Calculate pool cut for taxes.
    uint256 profit = price.sub(country.lastPrice);
    uint256 poolCut = calculatePoolCut(profit);
    poolTotal += poolCut;
    
    // 3% goes to developers
    uint256 devCut = price.mul(3).div(100);
    devOwed = devOwed.add(devCut);

    transferCountry(oldOwner, newOwner, _tokenId);

    // set new prices
    country.lastPrice = price;
    country.price = getNextPrice(price);

    // raise event
    CountryPurchased(_tokenId, newOwner, price);

    // Transfer payment to old owner minus the developer's and pool's cut.
    oldOwner.transfer(price.sub(devCut.add(poolCut)));

    // Send refund to owner if needed
    if (excess > 0) {
      newOwner.transfer(excess);
    }
    
    // set last purchase price to storage
    lastPurchase = now;

  }

  /**
  * @dev Transfer Country from Previous Owner to New Owner
  * @param _from previous owner address
  * @param _to new owner address
  * @param _tokenId uint256 ID of token
  */
  function transferCountry(address _from, address _to, uint256 _tokenId) internal {

    // check token exists
    require(tokenExists(_tokenId));

    // make sure previous owner is correct
    require(countryData[_tokenId].owner == _from);

    require(_to != address(0));
    require(_to != address(this));

    // pay any unpaid payouts to previous owner of country
    updateSinglePayout(_from, _tokenId);

    // clear approvals linked to this token
    clearApproval(_from, _tokenId);

    // remove token from previous owner
    removeToken(_from, _tokenId);

    // update owner and add token to new owner
    countryData[_tokenId].owner = _to;
    addToken(_to, _tokenId);

   //raise event
    Transfer(_from, _to, _tokenId);
  }

  /**
  * @dev Withdraw dev's cut
  */
  function withdraw() onlyOwner public {
    owner.transfer(devOwed);
    devOwed = 0;
  }

  /**
  * @dev Updates the payout for the countrys the owner has
  * @param _owner address of token owner
  */
  function updatePayout(address _owner) public {
    uint256[] memory countrys = ownedTokens[_owner];
    uint256 owed;
    for (uint256 i = 0; i < countrys.length; i++) {
        uint256 totalCountryOwed = poolTotal * countryData[countrys[i]].payout / 10000;
        uint256 countryOwed = totalCountryOwed.sub(countryData[countrys[i]].withdrawn);
        owed += countryOwed;
        
        countryData[countrys[i]].withdrawn += countryOwed;
    }
    payoutBalances[_owner] += owed;
  }

  /**
   * @dev Update a single country payout for transfers.
   * @param _owner Address of the owner of the country.
   * @param _itemId Unique Id of the token.
  **/
  function updateSinglePayout(address _owner, uint256 _itemId) internal {
    uint256 totalCountryOwed = poolTotal * countryData[_itemId].payout / 10000;
    uint256 countryOwed = totalCountryOwed.sub(countryData[_itemId].withdrawn);
        
    countryData[_itemId].withdrawn += countryOwed;
    payoutBalances[_owner] += countryOwed;
  }

  /**
  * @dev Owner can withdraw their accumulated payouts
  * @param _owner address of token owner
  */
  function withdrawRent(address _owner) public {
      updatePayout(_owner);
      uint256 payout = payoutBalances[_owner];
      payoutBalances[_owner] = 0;
      _owner.transfer(payout);
  }

  function getRentOwed(address _owner) public view returns (uint256 owed) {
    updatePayout(_owner);
    return payoutBalances[_owner];
  }

  /**
  * @dev Return all country data
  * @param _tokenId uint256 of token
  */
  function getCountryData (uint256 _tokenId) external view 
  returns (address _owner, uint256 _startingPrice, uint256 _price, uint256 _nextPrice, uint256 _payout) 
  {
    Country memory country = countryData[_tokenId];
    return (country.owner, country.startingPrice, country.price, getNextPrice(country.price), country.payout);
  }

  /**
  * @dev Determines if token exists by checking it's price
  * @param _tokenId uint256 ID of token
  */
  function tokenExists (uint256 _tokenId) public view returns (bool _exists) {
    return countryData[_tokenId].price > 0;
  }

  /**
  * @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);
    _;
  }

  /**
  * @dev Guarantees msg.sender is not a contract
  * @param _buyer address of person buying country
  */
  modifier isNotContract(address _buyer) {
    uint size;
    assembly { size := extcodesize(_buyer) }
    require(size == 0);
    _;
  }


  /**
  * @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 totalTokens;
  }

  /**
  * @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) {
    return ownedTokens[_owner].length;
  }

  /**
  * @dev Gets the list of tokens owned by a given address
  * @param _owner address to query the tokens of
  * @return uint256[] representing the list of tokens owned by the passed address
  */
  function tokensOf(address _owner) public view returns (uint256[]) {
    return ownedTokens[_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 Gets the approved address to take ownership of a given token ID
   * @param _tokenId uint256 ID of the token to query the approval of
   * @return address currently approved to take ownership of the given token ID
   */
  function approvedFor(uint256 _tokenId) public view returns (address) {
    return tokenApprovals[_tokenId];
  }

  /**
  * @dev Transfers the ownership of a given token ID to another address
  * @param _to address to receive the ownership of the given token ID
  * @param _tokenId uint256 ID of the token to be transferred
  */
  function transfer(address _to, uint256 _tokenId) public onlyOwnerOf(_tokenId) {
    clearApprovalAndTransfer(msg.sender, _to, _tokenId);
  }

  /**
  * @dev Approves another address to claim for the ownership of the given token ID
  * @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 onlyOwnerOf(_tokenId) {
    address owner = ownerOf(_tokenId);
    require(_to != owner);
    if (approvedFor(_tokenId) != 0 || _to != 0) {
      tokenApprovals[_tokenId] = _to;
      Approval(owner, _to, _tokenId);
    }
  }

  /**
  * @dev Claims the ownership of a given token ID
  * @param _tokenId uint256 ID of the token being claimed by the msg.sender
  */
  function takeOwnership(uint256 _tokenId) public {
    require(isApprovedFor(msg.sender, _tokenId));
    clearApprovalAndTransfer(ownerOf(_tokenId), msg.sender, _tokenId);
  }

  /**
   * @dev Tells whether the msg.sender is approved for the given token ID or not
   * This function is not private so it can be extended in further implementations like the operatable ERC721
   * @param _owner address of the owner to query the approval of
   * @param _tokenId uint256 ID of the token to query the approval of
   * @return bool whether the msg.sender is approved for the given token ID or not
   */
  function isApprovedFor(address _owner, uint256 _tokenId) internal view returns (bool) {
    return approvedFor(_tokenId) == _owner;
  }
  
  /**
  * @dev Internal function to clear current approval and transfer the ownership of a given token ID
  * @param _from address which you want to send tokens from
  * @param _to address which you want to transfer the token to
  * @param _tokenId uint256 ID of the token to be transferred
  */
  function clearApprovalAndTransfer(address _from, address _to, uint256 _tokenId) internal isNotContract(_to) {
    require(_to != address(0));
    require(_to != ownerOf(_tokenId));
    require(ownerOf(_tokenId) == _from);

    clearApproval(_from, _tokenId);
    updateSinglePayout(_from, _tokenId);
    removeToken(_from, _tokenId);
    addToken(_to, _tokenId);
    Transfer(_from, _to, _tokenId);
  }

  /**
  * @dev Internal function to clear current approval of a given token ID
  * @param _tokenId uint256 ID of the token to be transferred
  */
  function clearApproval(address _owner, uint256 _tokenId) private {
    require(ownerOf(_tokenId) == _owner);
    tokenApprovals[_tokenId] = 0;
    Approval(_owner, 0, _tokenId);
  }


    /**
  * @dev Mint token function
  * @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));
    addToken(_to, _tokenId);
    Transfer(0x0, _to, _tokenId);
  }

  /**
  * @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 addToken(address _to, uint256 _tokenId) private {
    require(tokenOwner[_tokenId] == address(0));
    tokenOwner[_tokenId] = _to;
    countryData[_tokenId].owner = _to;
    uint256 length = balanceOf(_to);
    ownedTokens[_to].push(_tokenId);
    ownedTokensIndex[_tokenId] = length;
    totalTokens = totalTokens.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 removeToken(address _from, uint256 _tokenId) private {
    require(ownerOf(_tokenId) == _from);

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

    tokenOwner[_tokenId] = 0;
    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;
    totalTokens = totalTokens.sub(1);
  }

  function name() public pure returns (string _name) {
    return "EtherCountries.io Country";
  }

  function symbol() public pure returns (string _symbol) {
    return "EC";
  }

}

Contract Security Audit

Contract ABI

API
[{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"tokenExists","outputs":[{"name":"_exists","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"getRentOwed","outputs":[{"name":"owed","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"_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":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"purchaseCountry","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"approvedFor","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"lastPurchase","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_price","type":"uint256"}],"name":"calculatePoolCut","outputs":[{"name":"_poolCut","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"countryData","outputs":[{"name":"startingPrice","type":"uint256"},{"name":"price","type":"uint256"},{"name":"lastPrice","type":"uint256"},{"name":"payout","type":"uint256"},{"name":"withdrawn","type":"uint256"},{"name":"owner","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"tokensOf","outputs":[{"name":"","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"withdrawRent","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"poolTotal","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_itemIds","type":"uint256[]"},{"name":"_prices","type":"uint256[]"},{"name":"_payouts","type":"uint256[]"},{"name":"_owners","type":"address[]"}],"name":"createMultiple","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_tokenId","type":"uint256"},{"name":"_startingPrice","type":"uint256"},{"name":"_payoutPercentage","type":"uint256"},{"name":"_owner","type":"address"}],"name":"createListing","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"_symbol","type":"string"}],"payable":false,"stateMutability":"pure","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":"_tokenId","type":"uint256"}],"name":"getCountryData","outputs":[{"name":"_owner","type":"address"},{"name":"_startingPrice","type":"uint256"},{"name":"_price","type":"uint256"},{"name":"_nextPrice","type":"uint256"},{"name":"_payout","type":"uint256"}],"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":"devOwed","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"updatePayout","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_tokenId","type":"uint256"},{"indexed":true,"name":"_owner","type":"address"},{"indexed":false,"name":"_purchasePrice","type":"uint256"}],"name":"CountryPurchased","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_approved","type":"address"},{"indexed":false,"name":"_tokenId","type":"uint256"}],"name":"Approval","type":"event"}]

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Swarm Source

bzzr://b540d430fab7d771a2fad4b2c2ea57216f49e76d4c9ec385835d31644d942a90

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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.