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Contract

0x2a605B89C3ddf839126DaCCd3FDAF6dF8C18DF76
 

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Method
Block
From
To
Payout52092082018-03-06 22:44:552544 days ago1520376295IN
0x2a605B89...F8C18DF76
0 ETH0.000249448
Purchase51630422018-02-27 2:40:332552 days ago1519699233IN
0x2a605B89...F8C18DF76
0.04360243 ETH0.000107781
Purchase51628752018-02-27 1:59:312552 days ago1519696771IN
0x2a605B89...F8C18DF76
0.00963177 ETH0.0001232
Purchase51627902018-02-27 1:41:542552 days ago1519695714IN
0x2a605B89...F8C18DF76
0.00963177 ETH0.000095894
Purchase51627882018-02-27 1:41:122552 days ago1519695672IN
0x2a605B89...F8C18DF76
0.00212765 ETH0.000024231
Purchase51589782018-02-26 10:06:222552 days ago1519639582IN
0x2a605B89...F8C18DF76
0.00452693 ETH0.000091034
Purchase51589752018-02-26 10:06:022552 days ago1519639562IN
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0.00452693 ETH0.000068273
Purchase51589742018-02-26 10:05:482552 days ago1519639548IN
0x2a605B89...F8C18DF76
0.00212765 ETH0.000045512
Transfer51588782018-02-26 9:41:572552 days ago1519638117IN
0x2a605B89...F8C18DF76
0 ETH0.0000633
Purchase51588732018-02-26 9:40:432552 days ago1519638043IN
0x2a605B89...F8C18DF76
0.00963177 ETH0.00076510
Purchase51588532018-02-26 9:36:332552 days ago1519637793IN
0x2a605B89...F8C18DF76
0.00963177 ETH0.000375154.1
Purchase51588502018-02-26 9:35:452552 days ago1519637745IN
0x2a605B89...F8C18DF76
0.00452693 ETH0.000645427
Purchase51588432018-02-26 9:34:082552 days ago1519637648IN
0x2a605B89...F8C18DF76
0.00452693 ETH0.000050062.2
Purchase51588402018-02-26 9:33:382552 days ago1519637618IN
0x2a605B89...F8C18DF76
0.00452693 ETH0.00046395
Purchase51588322018-02-26 9:32:122553 days ago1519637532IN
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0.00452693 ETH0.0005496
Purchase51588282018-02-26 9:31:212553 days ago1519637481IN
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0.00212765 ETH0.000118275
Purchase51588252018-02-26 9:30:422553 days ago1519637442IN
0x2a605B89...F8C18DF76
0.00212765 ETH0.00032134.2
Purchase51588242018-02-26 9:30:262553 days ago1519637426IN
0x2a605B89...F8C18DF76
0.00212765 ETH0.000313654.1
Purchase51588202018-02-26 9:29:552553 days ago1519637395IN
0x2a605B89...F8C18DF76
0.00212765 ETH0.000190654.1
Purchase51587942018-02-26 9:22:312553 days ago1519636951IN
0x2a605B89...F8C18DF76
0.001 ETH0.0001082
Purchase51587932018-02-26 9:22:202553 days ago1519636940IN
0x2a605B89...F8C18DF76
0.001 ETH0.0001382
Purchase51580352018-02-26 6:05:292553 days ago1519625129IN
0x2a605B89...F8C18DF76
0.001 ETH0.000199922
Create Contract ...51580202018-02-26 6:02:362553 days ago1519624956IN
0x2a605B89...F8C18DF76
0 ETH0.000210342
Create Contract ...51580182018-02-26 6:02:022553 days ago1519624922IN
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0 ETH0.000210462
Create Contract ...51580122018-02-26 6:00:482553 days ago1519624848IN
0x2a605B89...F8C18DF76
0 ETH0.000601495
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52092082018-03-06 22:44:552544 days ago1520376295
0x2a605B89...F8C18DF76
0.16043215 ETH
51630422018-02-27 2:40:332552 days ago1519699233
0x2a605B89...F8C18DF76
999 wei
51630422018-02-27 2:40:332552 days ago1519699233
0x2a605B89...F8C18DF76
0.04098628 ETH
51628752018-02-27 1:59:312552 days ago1519696771
0x2a605B89...F8C18DF76
0 ETH
51628752018-02-27 1:59:312552 days ago1519696771
0x2a605B89...F8C18DF76
0.00905387 ETH
51588732018-02-26 9:40:432552 days ago1519638043
0x2a605B89...F8C18DF76
0 ETH
51588732018-02-26 9:40:432552 days ago1519638043
0x2a605B89...F8C18DF76
0.00905387 ETH
51588532018-02-26 9:36:332552 days ago1519637793
0x2a605B89...F8C18DF76
0 ETH
51588532018-02-26 9:36:332552 days ago1519637793
0x2a605B89...F8C18DF76
0.00905387 ETH
51588502018-02-26 9:35:452552 days ago1519637745
0x2a605B89...F8C18DF76
0 ETH
51588502018-02-26 9:35:452552 days ago1519637745
0x2a605B89...F8C18DF76
0.00425531 ETH
51588402018-02-26 9:33:382552 days ago1519637618
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0 ETH
51588402018-02-26 9:33:382552 days ago1519637618
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0.00425531 ETH
51588322018-02-26 9:32:122553 days ago1519637532
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0 ETH
51588322018-02-26 9:32:122553 days ago1519637532
0x2a605B89...F8C18DF76
0.00425531 ETH
51588252018-02-26 9:30:422553 days ago1519637442
0x2a605B89...F8C18DF76
0 ETH
51588252018-02-26 9:30:422553 days ago1519637442
0x2a605B89...F8C18DF76
0.00199999 ETH
51588242018-02-26 9:30:262553 days ago1519637426
0x2a605B89...F8C18DF76
0 ETH
51588242018-02-26 9:30:262553 days ago1519637426
0x2a605B89...F8C18DF76
0.00199999 ETH
51588202018-02-26 9:29:552553 days ago1519637395
0x2a605B89...F8C18DF76
0 ETH
51588202018-02-26 9:29:552553 days ago1519637395
0x2a605B89...F8C18DF76
0.00199999 ETH
51587942018-02-26 9:22:312553 days ago1519636951
0x2a605B89...F8C18DF76
0 ETH
51587932018-02-26 9:22:202553 days ago1519636940
0x2a605B89...F8C18DF76
0 ETH
51580352018-02-26 6:05:292553 days ago1519625129
0x2a605B89...F8C18DF76
0 ETH
51546662018-02-25 16:13:582553 days ago1519575238
0x2a605B89...F8C18DF76
998 wei
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Contract Source Code Verified (Exact Match)

Contract Name:
CryptoSocialMediaToken

Compiler Version
v0.4.21-nightly.2018.2.23+commit.cae6cc2c

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-02-24
*/

pragma solidity ^0.4.18; 



/// @title Interface for contracts conforming to ERC-721: Non-Fungible Tokens
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 CryptoSocialMediaToken is ERC721 {

  // Modified CryptoCelebs contract
  // Note: "Item" refers to a SocialMedia asset.
  
  /*** EVENTS ***/

  /// @dev The Birth event is fired whenever a new item comes into existence.
  event Birth(uint256 tokenId, string name, address owner, bytes32 message);

  /// @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);

  /// @dev Transfer event as defined in current draft of ERC721. 
  ///  ownership is assigned, including births.
  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 = "CryptoSocialMedia"; // solhint-disable-line
  string public constant SYMBOL = "CryptoSocialMediaToken"; // solhint-disable-line

  uint256 private startingPrice = 0.001 ether;
  uint256 private constant PROMO_CREATION_LIMIT = 5000;
  uint256 private firstStepLimit =  0.053613 ether;
  uint256 private secondStepLimit = 0.564957 ether;

  /*** STORAGE ***/

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

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

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

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

  /*** DATATYPES ***/
  struct Item {
    string name;
	bytes32 message;
  }

  Item[] private items;

  /*** 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 CryptoSocialMediaToken() public {
    ceoAddress = msg.sender;
    cooAddress = msg.sender;
	
	createContractItem("4chan", "");
	createContractItem("9gag", "");
	createContractItem("Discord", "");
	createContractItem("Facebook", "");
	createContractItem("Google Plus", "");
	createContractItem("Instagram", "");
	createContractItem("Medium", "");
	createContractItem("Periscope", "");
	createContractItem("Pinterest", "");
	createContractItem("Reddit", "");
	createContractItem("Skype", "");
	createContractItem("Snapchat", "");
	createContractItem("Tumblr", "");
	createContractItem("Twitch", "");
	createContractItem("Twitter", "");
	createContractItem("Wechat", "");
	createContractItem("Whatsapp", "");
	createContractItem("Youtube", "");
	
  }

  /*** 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));

    itemIndexToApproved[_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 Item with the given name.
  function createContractItem(string _name, bytes32 _message) public onlyCOO {
    _createItem(_name, address(this), startingPrice, _message);
  }

  /// @notice Returns all the relevant information about a specific item.
  /// @param _tokenId The tokenId of the item of interest.
  function getItem(uint256 _tokenId) public view returns (
    string itemName,
    uint256 sellingPrice,
    address owner,
	bytes32 itemMessage
  ) {
    Item storage item = items[_tokenId];
    itemName = item.name;
	itemMessage = item.message;
    sellingPrice = itemIndexToPrice[_tokenId];
    owner = itemIndexToOwner[_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 = itemIndexToOwner[_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, bytes32 _message) public payable {
    address oldOwner = itemIndexToOwner[_tokenId];
    address newOwner = msg.sender;

    uint256 sellingPrice = itemIndexToPrice[_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 prices
    if (sellingPrice < firstStepLimit) {
      // first stage
      itemIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 200), 94);
    } else if (sellingPrice < secondStepLimit) {
      // second stage
      itemIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 120), 94);
    } else {
      // third stage
      itemIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 115), 94);
    }

    _transfer(oldOwner, newOwner, _tokenId);
	
    // Pay previous tokenOwner if owner is not contract
    if (oldOwner != address(this)) {
      oldOwner.transfer(payment); //(1-0.06)
    }

    TokenSold(_tokenId, sellingPrice, itemIndexToPrice[_tokenId], oldOwner, newOwner, items[_tokenId].name);

    msg.sender.transfer(purchaseExcess);
	
	// Update the message of the item 
	items[_tokenId].message = _message;
  }

  function priceOf(uint256 _tokenId) public view returns (uint256 price) {
    return itemIndexToPrice[_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 = itemIndexToOwner[_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 social media 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 Items array looking for items 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 totalItems = totalSupply();
      uint256 resultIndex = 0;

      uint256 itemId;
      for (itemId = 0; itemId <= totalItems; itemId++) {
        if (itemIndexToOwner[itemId] == _owner) {
          result[resultIndex] = itemId;
          resultIndex++;
        }
      }
      return result;
    }
  }

  /// For querying totalSupply of token
  /// @dev Required for ERC-721 compliance.
  function totalSupply() public view returns (uint256 total) {
    return items.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 itemIndexToApproved[_tokenId] == _to;
  }

  /// For creating Item
  function _createItem(string _name, address _owner, uint256 _price, bytes32 _message) private {
    Item memory _item = Item({
      name: _name,
	  message: _message
    });
    uint256 newItemId = items.push(_item) - 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(newItemId == uint256(uint32(newItemId)));

    Birth(newItemId, _name, _owner, _message);

    itemIndexToPrice[newItemId] = _price;

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

  /// Check for token ownership
  function _owns(address claimant, uint256 _tokenId) private view returns (bool) {
    return claimant == itemIndexToOwner[_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 Item to an address.
  function _transfer(address _from, address _to, uint256 _tokenId) private {
    // Since the number of items is capped to 2^32 we can't overflow this
    ownershipTokenCount[_to]++;
    //transfer ownership
    itemIndexToOwner[_tokenId] = _to;

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

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Swarm Source

bzzr://763284522bf8109168c908226877a0f5ca8b894b095fd464e0aa397ed4c2fdd9

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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.