ERC-20
Overview
Max Total Supply
59 EC
Holders
28
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 0 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
CountryToken
Compiler Version
v0.4.19+commit.c4cbbb05
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *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
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Deployed Bytecode
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Swarm Source
bzzr://b540d430fab7d771a2fad4b2c2ea57216f49e76d4c9ec385835d31644d942a90
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