ETH Price: $3,638.95 (-1.76%)

Contract

0x92cB5F1FbabbcbDd891B9Cbd8E9a056c8c1eEbEF
 
Transaction Hash
Method
Block
From
To
Approve204668442024-08-06 3:28:23118 days ago1722914903IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.000086192.58723255
Set Owner204552202024-08-04 12:33:59120 days ago1722774839IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.000028891.20382362
Withdraw Amount204551892024-08-04 12:27:35120 days ago1722774455IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.000028291.19777143
Buy204551372024-08-04 12:17:11120 days ago1722773831IN
0x92cB5F1F...c8c1eEbEF
0.0001 ETH0.000029861.11162539
Approve204551332024-08-04 12:16:23120 days ago1722773783IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.000026941.10966643
Buy204551262024-08-04 12:14:59120 days ago1722773699IN
0x92cB5F1F...c8c1eEbEF
0.0001 ETH0.00002911.08343478
Approve197367162024-04-26 3:00:11220 days ago1714100411IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.000263234.94652729
Approve193890992024-03-08 7:56:47269 days ago1709884607IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0022428462.12187776
Approve191902112024-02-09 11:16:11297 days ago1707477371IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0025679148.25463535
Approve191902072024-02-09 11:15:23297 days ago1707477323IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0026439349.68302131
Approve191902042024-02-09 11:14:47297 days ago1707477287IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0027687452.02849935
Approve183339032023-10-12 11:01:23417 days ago1697108483IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.000344686.47702284
Approve181791652023-09-20 19:23:11439 days ago1695237791IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0013890238.47295674
Approve181791622023-09-20 19:22:35439 days ago1695237755IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0014094939.02696006
Approve181791582023-09-20 19:21:47439 days ago1695237707IN
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0 ETH0.0014854641.13035779
Approve181791502023-09-20 19:20:11439 days ago1695237611IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0015999944.30142391
Approve168507642023-03-17 23:23:11626 days ago1679095391IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0016373330.77474512
Approve167619982023-03-05 11:48:23638 days ago1678016903IN
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0 ETH0.0006484517.95480926
Approve167599392023-03-05 4:50:11638 days ago1677991811IN
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0 ETH0.001045719.65018027
Approve167599352023-03-05 4:49:23638 days ago1677991763IN
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0 ETH0.0010710120.12587417
Approve161227792022-12-06 2:31:23727 days ago1670293883IN
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0 ETH0.0005130314.20990034
Approve157394042022-10-13 13:09:59781 days ago1665666599IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0012642823.75763073
Transfer152922372022-08-07 1:26:24848 days ago1659835584IN
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0 ETH0.00012373.3008812
Approve152835462022-08-05 16:58:58850 days ago1659718738IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.000821922.75722907
Transfer From150090292022-06-22 18:46:19894 days ago1655923579IN
0x92cB5F1F...c8c1eEbEF
0 ETH0.0011158341.20199453
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Latest 25 internal transactions (View All)

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Parent Transaction Hash Block From To
65527632018-10-20 22:16:372235 days ago1540073797
0x92cB5F1F...c8c1eEbEF
0.00000913 ETH
65527632018-10-20 22:16:372235 days ago1540073797
0x92cB5F1F...c8c1eEbEF
4.23371134 ETH
61379262018-08-13 4:01:132303 days ago1534132873
0x92cB5F1F...c8c1eEbEF
0.00000567 ETH
61379262018-08-13 4:01:132303 days ago1534132873
0x92cB5F1F...c8c1eEbEF
3.82593639 ETH
61158712018-08-09 10:24:422307 days ago1533810282
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0.00376694 ETH
61158712018-08-09 10:24:422307 days ago1533810282
0x92cB5F1F...c8c1eEbEF
5.00410839 ETH
61158532018-08-09 10:20:012307 days ago1533810001
0x92cB5F1F...c8c1eEbEF
0.09028074 ETH
61158532018-08-09 10:20:012307 days ago1533810001
0x92cB5F1F...c8c1eEbEF
3.40442767 ETH
60222382018-07-24 15:00:092323 days ago1532444409
0x92cB5F1F...c8c1eEbEF
0.00000913 ETH
60222382018-07-24 15:00:092323 days ago1532444409
0x92cB5F1F...c8c1eEbEF
4.23371134 ETH
59975282018-07-20 10:29:092327 days ago1532082549
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0.00000529 ETH
59975282018-07-20 10:29:092327 days ago1532082549
0x92cB5F1F...c8c1eEbEF
4.61478926 ETH
58625912018-06-27 9:50:472350 days ago1530093047
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0.00001476 ETH
58625912018-06-27 9:50:472350 days ago1530093047
0x92cB5F1F...c8c1eEbEF
2.07580508 ETH
58436092018-06-24 2:36:582353 days ago1529807818
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0.0000139 ETH
58436092018-06-24 2:36:582353 days ago1529807818
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2.41623711 ETH
55135182018-04-27 7:07:332411 days ago1524812853
0x92cB5F1F...c8c1eEbEF
0.00000823 ETH
55135182018-04-27 7:07:332411 days ago1524812853
0x92cB5F1F...c8c1eEbEF
4.2333727 ETH
53997512018-04-07 22:45:112431 days ago1523141111
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0.00001423 ETH
53997512018-04-07 22:45:112431 days ago1523141111
0x92cB5F1F...c8c1eEbEF
2.28338558 ETH
53506932018-03-30 19:45:402439 days ago1522439140
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0.00000889 ETH
53506932018-03-30 19:45:402439 days ago1522439140
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3.17193017 ETH
52766542018-03-18 9:57:002451 days ago1521367020
0x92cB5F1F...c8c1eEbEF
159.74409837 ETH
52754022018-03-18 4:55:342451 days ago1521348934
0x92cB5F1F...c8c1eEbEF
0.00001476 ETH
52754022018-03-18 4:55:342451 days ago1521348934
0x92cB5F1F...c8c1eEbEF
2.07580508 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
ItemToken

Compiler Version
v0.4.20-nightly.2018.1.29+commit.a668b9de

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-02-03
*/

pragma solidity ^0.4.13;

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 ItemToken {
  using SafeMath for uint256;

  event Bought (uint256 indexed _itemId, address indexed _owner, uint256 _price);
  event Sold (uint256 indexed _itemId, address indexed _owner, uint256 _price);
  event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
  event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);

  address private owner;
  mapping (address => bool) private admins;
  IItemRegistry private itemRegistry;
  bool private erc721Enabled = false;

  uint256 private increaseLimit1 = 0.02 ether;
  uint256 private increaseLimit2 = 0.5 ether;
  uint256 private increaseLimit3 = 2.0 ether;
  uint256 private increaseLimit4 = 5.0 ether;

  uint256[] private listedItems;
  mapping (uint256 => address) private ownerOfItem;
  mapping (uint256 => uint256) private startingPriceOfItem;
  mapping (uint256 => uint256) private priceOfItem;
  mapping (uint256 => address) private approvedOfItem;

  function ItemToken () public {
    owner = msg.sender;
    admins[owner] = true;
  }

  /* Modifiers */
  modifier onlyOwner() {
    require(owner == msg.sender);
    _;
  }

  modifier onlyAdmins() {
    require(admins[msg.sender]);
    _;
  }

  modifier onlyERC721() {
    require(erc721Enabled);
    _;
  }

  /* Owner */
  function setOwner (address _owner) onlyOwner() public {
    owner = _owner;
  }

  function setItemRegistry (address _itemRegistry) onlyOwner() public {
    itemRegistry = IItemRegistry(_itemRegistry);
  }

  function addAdmin (address _admin) onlyOwner() public {
    admins[_admin] = true;
  }

  function removeAdmin (address _admin) onlyOwner() public {
    delete admins[_admin];
  }

  // Unlocks ERC721 behaviour, allowing for trading on third party platforms.
  function enableERC721 () onlyOwner() public {
    erc721Enabled = true;
  }

  /* Withdraw */
  /*
    NOTICE: These functions withdraw the developer's cut which is left
    in the contract by `buy`. User funds are immediately sent to the old
    owner in `buy`, no user funds are left in the contract.
  */
  function withdrawAll () onlyOwner() public {
    owner.transfer(this.balance);
  }

  function withdrawAmount (uint256 _amount) onlyOwner() public {
    owner.transfer(_amount);
  }

  /* Listing */
  function populateFromItemRegistry (uint256[] _itemIds) onlyOwner() public {
    for (uint256 i = 0; i < _itemIds.length; i++) {
      if (priceOfItem[_itemIds[i]] > 0 || itemRegistry.priceOf(_itemIds[i]) == 0) {
        continue;
      }

      listItemFromRegistry(_itemIds[i]);
    }
  }

  function listItemFromRegistry (uint256 _itemId) onlyOwner() public {
    require(itemRegistry != address(0));
    require(itemRegistry.ownerOf(_itemId) != address(0));
    require(itemRegistry.priceOf(_itemId) > 0);

    uint256 price = itemRegistry.priceOf(_itemId);
    address itemOwner = itemRegistry.ownerOf(_itemId);
    listItem(_itemId, price, itemOwner);
  }

  function listMultipleItems (uint256[] _itemIds, uint256 _price, address _owner) onlyAdmins() external {
    for (uint256 i = 0; i < _itemIds.length; i++) {
      listItem(_itemIds[i], _price, _owner);
    }
  }

  function listItem (uint256 _itemId, uint256 _price, address _owner) onlyAdmins() public {
    require(_price > 0);
    require(priceOfItem[_itemId] == 0);
    require(ownerOfItem[_itemId] == address(0));

    ownerOfItem[_itemId] = _owner;
    priceOfItem[_itemId] = _price;
    startingPriceOfItem[_itemId] = _price;
    listedItems.push(_itemId);
  }

  /* Buying */
  function calculateNextPrice (uint256 _price) public view returns (uint256 _nextPrice) {
    if (_price < increaseLimit1) {
      return _price.mul(200).div(95);
    } else if (_price < increaseLimit2) {
      return _price.mul(135).div(96);
    } else if (_price < increaseLimit3) {
      return _price.mul(125).div(97);
    } else if (_price < increaseLimit4) {
      return _price.mul(117).div(97);
    } else {
      return _price.mul(115).div(98);
    }
  }

  function calculateDevCut (uint256 _price) public view returns (uint256 _devCut) {
    if (_price < increaseLimit1) {
      return _price.mul(5).div(100); // 5%
    } else if (_price < increaseLimit2) {
      return _price.mul(4).div(100); // 4%
    } else if (_price < increaseLimit3) {
      return _price.mul(3).div(100); // 3%
    } else if (_price < increaseLimit4) {
      return _price.mul(3).div(100); // 3%
    } else {
      return _price.mul(2).div(100); // 2%
    }
  }

  /*
     Buy a country directly from the contract for the calculated price
     which ensures that the owner gets a profit.  All countries that
     have been listed can be bought by this method. User funds are sent
     directly to the previous owner and are never stored in the contract.
  */
  function buy (uint256 _itemId) payable public {
    require(priceOf(_itemId) > 0);
    require(ownerOf(_itemId) != address(0));
    require(msg.value >= priceOf(_itemId));
    require(ownerOf(_itemId) != msg.sender);
    require(!isContract(msg.sender));
    require(msg.sender != address(0));

    address oldOwner = ownerOf(_itemId);
    address newOwner = msg.sender;
    uint256 price = priceOf(_itemId);
    uint256 excess = msg.value.sub(price);

    _transfer(oldOwner, newOwner, _itemId);
    priceOfItem[_itemId] = nextPriceOf(_itemId);

    Bought(_itemId, newOwner, price);
    Sold(_itemId, oldOwner, price);

    // Devevloper's cut which is left in contract and accesed by
    // `withdrawAll` and `withdrawAmountTo` methods.
    uint256 devCut = calculateDevCut(price);

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

    if (excess > 0) {
      newOwner.transfer(excess);
    }
  }

  /* ERC721 */
  function implementsERC721() public view returns (bool _implements) {
    return erc721Enabled;
  }

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

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

  function totalSupply() public view returns (uint256 _totalSupply) {
    return listedItems.length;
  }

  function balanceOf (address _owner) public view returns (uint256 _balance) {
    uint256 counter = 0;

    for (uint256 i = 0; i < listedItems.length; i++) {
      if (ownerOf(listedItems[i]) == _owner) {
        counter++;
      }
    }

    return counter;
  }

  function ownerOf (uint256 _itemId) public view returns (address _owner) {
    return ownerOfItem[_itemId];
  }

  function tokensOf (address _owner) public view returns (uint256[] _tokenIds) {
    uint256[] memory items = new uint256[](balanceOf(_owner));

    uint256 itemCounter = 0;
    for (uint256 i = 0; i < listedItems.length; i++) {
      if (ownerOf(listedItems[i]) == _owner) {
        items[itemCounter] = listedItems[i];
        itemCounter += 1;
      }
    }

    return items;
  }

  function tokenExists (uint256 _itemId) public view returns (bool _exists) {
    return priceOf(_itemId) > 0;
  }

  function approvedFor(uint256 _itemId) public view returns (address _approved) {
    return approvedOfItem[_itemId];
  }

  function approve(address _to, uint256 _itemId) onlyERC721() public {
    require(msg.sender != _to);
    require(tokenExists(_itemId));
    require(ownerOf(_itemId) == msg.sender);

    if (_to == 0) {
      if (approvedOfItem[_itemId] != 0) {
        delete approvedOfItem[_itemId];
        Approval(msg.sender, 0, _itemId);
      }
    } else {
      approvedOfItem[_itemId] = _to;
      Approval(msg.sender, _to, _itemId);
    }
  }

  /* Transferring a country to another owner will entitle the new owner the profits from `buy` */
  function transfer(address _to, uint256 _itemId) onlyERC721() public {
    require(msg.sender == ownerOf(_itemId));
    _transfer(msg.sender, _to, _itemId);
  }

  function transferFrom(address _from, address _to, uint256 _itemId) onlyERC721() public {
    require(approvedFor(_itemId) == msg.sender);
    _transfer(_from, _to, _itemId);
  }

  function _transfer(address _from, address _to, uint256 _itemId) internal {
    require(tokenExists(_itemId));
    require(ownerOf(_itemId) == _from);
    require(_to != address(0));
    require(_to != address(this));

    ownerOfItem[_itemId] = _to;
    approvedOfItem[_itemId] = 0;

    Transfer(_from, _to, _itemId);
  }

  /* Read */
  function isAdmin (address _admin) public view returns (bool _isAdmin) {
    return admins[_admin];
  }

  function startingPriceOf (uint256 _itemId) public view returns (uint256 _startingPrice) {
    return startingPriceOfItem[_itemId];
  }

  function priceOf (uint256 _itemId) public view returns (uint256 _price) {
    return priceOfItem[_itemId];
  }

  function nextPriceOf (uint256 _itemId) public view returns (uint256 _nextPrice) {
    return calculateNextPrice(priceOf(_itemId));
  }

  function allOf (uint256 _itemId) external view returns (address _owner, uint256 _startingPrice, uint256 _price, uint256 _nextPrice) {
    return (ownerOf(_itemId), startingPriceOf(_itemId), priceOf(_itemId), nextPriceOf(_itemId));
  }

  function itemsForSaleLimit (uint256 _from, uint256 _take) public view returns (uint256[] _items) {
    uint256[] memory items = new uint256[](_take);

    for (uint256 i = 0; i < _take; i++) {
      items[i] = listedItems[_from + i];
    }

    return items;
  }

  /* Util */
  function isContract(address addr) internal view returns (bool) {
    uint size;
    assembly { size := extcodesize(addr) } // solium-disable-line
    return size > 0;
  }
}

interface IItemRegistry {
  function itemsForSaleLimit (uint256 _from, uint256 _take) public view returns (uint256[] _items);
  function ownerOf (uint256 _itemId) public view returns (address _owner);
  function priceOf (uint256 _itemId) public view returns (uint256 _price);
}

Contract Security Audit

Contract ABI

[{"constant":true,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"tokenExists","outputs":[{"name":"_exists","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_amount","type":"uint256"}],"name":"withdrawAmount","outputs":[],"payable":false,"stateMutability":"nonpayable","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":"_itemId","type":"uint256"}],"name":"approve","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"implementsERC721","outputs":[{"name":"_implements","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_owner","type":"address"}],"name":"setOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_admin","type":"address"}],"name":"removeAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"_totalSupply","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_itemRegistry","type":"address"}],"name":"setItemRegistry","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_itemId","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_admin","type":"address"}],"name":"isAdmin","outputs":[{"name":"_isAdmin","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"approvedFor","outputs":[{"name":"_approved","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"allOf","outputs":[{"name":"_owner","type":"address"},{"name":"_startingPrice","type":"uint256"},{"name":"_price","type":"uint256"},{"name":"_nextPrice","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"listItemFromRegistry","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_itemId","type":"uint256"},{"name":"_price","type":"uint256"},{"name":"_owner","type":"address"}],"name":"listItem","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_from","type":"uint256"},{"name":"_take","type":"uint256"}],"name":"itemsForSaleLimit","outputs":[{"name":"_items","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"tokensOf","outputs":[{"name":"_tokenIds","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"nextPriceOf","outputs":[{"name":"_nextPrice","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"ownerOf","outputs":[{"name":"_owner","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_price","type":"uint256"}],"name":"calculateDevCut","outputs":[{"name":"_devCut","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_admin","type":"address"}],"name":"addAdmin","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"_balance","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"enableERC721","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"withdrawAll","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_itemIds","type":"uint256[]"}],"name":"populateFromItemRegistry","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":"_itemId","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"startingPriceOf","outputs":[{"name":"_startingPrice","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"priceOf","outputs":[{"name":"_price","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_itemIds","type":"uint256[]"},{"name":"_price","type":"uint256"},{"name":"_owner","type":"address"}],"name":"listMultipleItems","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_itemId","type":"uint256"}],"name":"buy","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"_price","type":"uint256"}],"name":"calculateNextPrice","outputs":[{"name":"_nextPrice","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_itemId","type":"uint256"},{"indexed":true,"name":"_owner","type":"address"},{"indexed":false,"name":"_price","type":"uint256"}],"name":"Bought","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_itemId","type":"uint256"},{"indexed":true,"name":"_owner","type":"address"},{"indexed":false,"name":"_price","type":"uint256"}],"name":"Sold","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://d02d851d837ae9e5e9201563ae875962723201215471d512c64af47770035e05

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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.