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Contract

0x124F967d50dEdF23D9B1cC4Ac42851513bC67C07
 

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ETH Balance

0.0064 ETH

Eth Value

$23.43 (@ $3,660.32/ETH)

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Buy53893172018-04-06 5:17:532448 days ago1522991873IN
0x124F967d...13bC67C07
0.08 ETH0.000359834.4
Withdraw All52733032018-03-17 20:21:472468 days ago1521318107IN
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0 ETH0.000154554
Buy52606302018-03-15 16:59:402470 days ago1521133180IN
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0.04 ETH0.000267124
Buy52606192018-03-15 16:57:072470 days ago1521133027IN
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0.04 ETH0.000267124
Buy52606132018-03-15 16:55:392470 days ago1521132939IN
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0.04 ETH0.000267124
Buy52596062018-03-15 12:30:522470 days ago1521117052IN
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0.04 ETH0.000163562
Buy52445022018-03-12 22:37:232473 days ago1520894243IN
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0.32 ETH0.0006213712
Buy52428862018-03-12 15:56:542473 days ago1520870214IN
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0.16 ETH0.0009813712
Buy52404942018-03-12 6:01:572473 days ago1520834517IN
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0.16 ETH0.000200343
Buy52404782018-03-12 5:58:192473 days ago1520834299IN
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0.16 ETH0.000200343
Buy52404772018-03-12 5:58:182473 days ago1520834298IN
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0.16 ETH0.000200343
Buy52404562018-03-12 5:51:392473 days ago1520833899IN
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0.884736 ETH0.000268254
Buy52404272018-03-12 5:43:432473 days ago1520833423IN
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0.08 ETH0.000267124
Buy52404232018-03-12 5:42:502473 days ago1520833370IN
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0.08 ETH0.000267124
Buy52404232018-03-12 5:42:502473 days ago1520833370IN
0x124F967d...13bC67C07
0.04 ETH0.000267124
Buy52403882018-03-12 5:34:082473 days ago1520832848IN
0x124F967d...13bC67C07
0.08 ETH0.000267124
Buy52403882018-03-12 5:34:082473 days ago1520832848IN
0x124F967d...13bC67C07
0.08 ETH0.000267124
Buy52403882018-03-12 5:34:082473 days ago1520832848IN
0x124F967d...13bC67C07
0.08 ETH0.000267124
Buy52401702018-03-12 4:43:042473 days ago1520829784IN
0x124F967d...13bC67C07
0.08 ETH0.000066781
Buy52401702018-03-12 4:43:042473 days ago1520829784IN
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0.08 ETH0.000066781
Buy52401702018-03-12 4:43:042473 days ago1520829784IN
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0.08 ETH0.000066781
Buy52401592018-03-12 4:41:362473 days ago1520829696IN
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0.08 ETH0.000066781
Buy52401382018-03-12 4:36:392473 days ago1520829399IN
0x124F967d...13bC67C07
0.08 ETH0.000066781
Buy52383272018-03-11 21:17:242474 days ago1520803044IN
0x124F967d...13bC67C07
0.08 ETH0.000051781
Buy52351392018-03-11 8:31:392474 days ago1520757099IN
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1.91102976 ETH0.000274954.1
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Latest 25 internal transactions (View All)

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53893172018-04-06 5:17:532448 days ago1522991873
0x124F967d...13bC67C07
0.0736 ETH
52733032018-03-17 20:21:472468 days ago1521318107
0x124F967d...13bC67C07
0.72763658 ETH
52733032018-03-17 20:21:472468 days ago1521318107
0x124F967d...13bC67C07
0.72763658 ETH
52606302018-03-15 16:59:402470 days ago1521133180
0x124F967d...13bC67C07
0.0368 ETH
52606192018-03-15 16:57:072470 days ago1521133027
0x124F967d...13bC67C07
0.0368 ETH
52606132018-03-15 16:55:392470 days ago1521132939
0x124F967d...13bC67C07
0.0368 ETH
52596062018-03-15 12:30:522470 days ago1521117052
0x124F967d...13bC67C07
0.0368 ETH
52445022018-03-12 22:37:232473 days ago1520894243
0x124F967d...13bC67C07
0.2944 ETH
52428862018-03-12 15:56:542473 days ago1520870214
0x124F967d...13bC67C07
0.1472 ETH
52404942018-03-12 6:01:572473 days ago1520834517
0x124F967d...13bC67C07
0.1472 ETH
52404782018-03-12 5:58:192473 days ago1520834299
0x124F967d...13bC67C07
0.1472 ETH
52404772018-03-12 5:58:182473 days ago1520834298
0x124F967d...13bC67C07
0.1472 ETH
52404562018-03-12 5:51:392473 days ago1520833899
0x124F967d...13bC67C07
0.81395712 ETH
52404272018-03-12 5:43:432473 days ago1520833423
0x124F967d...13bC67C07
0.0736 ETH
52404232018-03-12 5:42:502473 days ago1520833370
0x124F967d...13bC67C07
0.0736 ETH
52404232018-03-12 5:42:502473 days ago1520833370
0x124F967d...13bC67C07
0.0368 ETH
52403882018-03-12 5:34:082473 days ago1520832848
0x124F967d...13bC67C07
0.0736 ETH
52403882018-03-12 5:34:082473 days ago1520832848
0x124F967d...13bC67C07
0.0736 ETH
52403882018-03-12 5:34:082473 days ago1520832848
0x124F967d...13bC67C07
0.0736 ETH
52401702018-03-12 4:43:042473 days ago1520829784
0x124F967d...13bC67C07
0.0736 ETH
52401702018-03-12 4:43:042473 days ago1520829784
0x124F967d...13bC67C07
0.0736 ETH
52401702018-03-12 4:43:042473 days ago1520829784
0x124F967d...13bC67C07
0.0736 ETH
52401592018-03-12 4:41:362473 days ago1520829696
0x124F967d...13bC67C07
0.0736 ETH
52401382018-03-12 4:36:392473 days ago1520829399
0x124F967d...13bC67C07
0.0736 ETH
52383272018-03-11 21:17:242474 days ago1520803044
0x124F967d...13bC67C07
0.0736 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
KpopCeleb

Compiler Version
v0.4.20+commit.3155dd80

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-03-07
*/

// KpopCeleb is a ERC-721 celeb (https://github.com/ethereum/eips/issues/721)
// Kpop celebrity cards as digital collectibles
// Kpop.io is the official website

pragma solidity ^0.4.18;

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
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 ERC721 {
  function approve(address _to, uint _celebId) public;
  function balanceOf(address _owner) public view returns (uint balance);
  function implementsERC721() public pure returns (bool);
  function ownerOf(uint _celebId) public view returns (address addr);
  function takeOwnership(uint _celebId) public;
  function totalSupply() public view returns (uint total);
  function transferFrom(address _from, address _to, uint _celebId) public;
  function transfer(address _to, uint _celebId) public;

  event Transfer(address indexed from, address indexed to, uint celebId);
  event Approval(address indexed owner, address indexed approved, uint celebId);
}

contract KpopCeleb is ERC721 {
  using SafeMath for uint;

  address public author;
  address public coauthor;

  string public constant NAME = "KpopCeleb";
  string public constant SYMBOL = "KpopCeleb";

  uint public GROWTH_BUMP = 0.5 ether;
  uint public MIN_STARTING_PRICE = 0.002 ether;
  uint public PRICE_INCREASE_SCALE = 120; // 120% of previous price

  struct Celeb {
    string name;
  }

  Celeb[] public celebs;

  mapping(uint => address) public celebIdToOwner;
  mapping(uint => uint) public celebIdToPrice; // in wei
  mapping(address => uint) public userToNumCelebs;
  mapping(uint => address) public celebIdToApprovedRecipient;
  mapping(uint => uint[6]) public celebIdToTraitValues;
  mapping(uint => uint[6]) public celebIdToTraitBoosters;

  address public KPOP_ARENA_CONTRACT_ADDRESS = 0x0;

  event Transfer(address indexed from, address indexed to, uint celebId);
  event Approval(address indexed owner, address indexed approved, uint celebId);
  event CelebSold(uint celebId, uint oldPrice, uint newPrice, string celebName, address prevOwner, address newOwner);

  function KpopCeleb() public {
    author = msg.sender;
    coauthor = msg.sender;
  }

  function _transfer(address _from, address _to, uint _celebId) private {
    require(ownerOf(_celebId) == _from);
    require(!isNullAddress(_to));
    require(balanceOf(_from) > 0);

    uint prevBalances = balanceOf(_from) + balanceOf(_to);
    celebIdToOwner[_celebId] = _to;
    userToNumCelebs[_from]--;
    userToNumCelebs[_to]++;

    // Clear outstanding approvals
    delete celebIdToApprovedRecipient[_celebId];

    Transfer(_from, _to, _celebId);

    assert(balanceOf(_from) + balanceOf(_to) == prevBalances);
  }

  function buy(uint _celebId) payable public {
    address prevOwner = ownerOf(_celebId);
    uint currentPrice = celebIdToPrice[_celebId];

    require(prevOwner != msg.sender);
    require(!isNullAddress(msg.sender));
    require(msg.value >= currentPrice);

    // Take a cut off the payment
    uint payment = uint(SafeMath.div(SafeMath.mul(currentPrice, 92), 100));
    uint leftover = SafeMath.sub(msg.value, currentPrice);
    uint newPrice;

    _transfer(prevOwner, msg.sender, _celebId);

    if (currentPrice < GROWTH_BUMP) {
      newPrice = SafeMath.mul(currentPrice, 2);
    } else {
      newPrice = SafeMath.div(SafeMath.mul(currentPrice, PRICE_INCREASE_SCALE), 100);
    }

    celebIdToPrice[_celebId] = newPrice;

    if (prevOwner != address(this)) {
      prevOwner.transfer(payment);
    }

    CelebSold(_celebId, currentPrice, newPrice,
      celebs[_celebId].name, prevOwner, msg.sender);

    msg.sender.transfer(leftover);
  }

  function balanceOf(address _owner) public view returns (uint balance) {
    return userToNumCelebs[_owner];
  }

  function ownerOf(uint _celebId) public view returns (address addr) {
    return celebIdToOwner[_celebId];
  }

  function totalSupply() public view returns (uint total) {
    return celebs.length;
  }

  function transfer(address _to, uint _celebId) public {
    _transfer(msg.sender, _to, _celebId);
  }

  /** START FUNCTIONS FOR AUTHORS **/

  function createCeleb(string _name, uint _price, address _owner, uint[6] _traitValues, uint[6] _traitBoosters) public onlyAuthors {
    require(_price >= MIN_STARTING_PRICE);

    address owner = _owner == 0x0 ? author : _owner;

    uint celebId = celebs.push(Celeb(_name)) - 1;
    celebIdToOwner[celebId] = owner;
    celebIdToPrice[celebId] = _price;
    celebIdToTraitValues[celebId] = _traitValues;
    celebIdToTraitBoosters[celebId] = _traitBoosters;
    userToNumCelebs[owner]++;
  }

  function updateCeleb(uint _celebId, string _name, uint[6] _traitValues, uint[6] _traitBoosters) public onlyAuthors {
    require(_celebId >= 0 && _celebId < totalSupply());

    celebs[_celebId].name = _name;
    celebIdToTraitValues[_celebId] = _traitValues;
    celebIdToTraitBoosters[_celebId] = _traitBoosters;
  }

  function withdraw(uint _amount, address _to) public onlyAuthors {
    require(!isNullAddress(_to));
    require(_amount <= this.balance);

    _to.transfer(_amount);
  }

  function withdrawAll() public onlyAuthors {
    require(author != 0x0);
    require(coauthor != 0x0);

    uint halfBalance = uint(SafeMath.div(this.balance, 2));

    author.transfer(halfBalance);
    coauthor.transfer(halfBalance);
  }

  function setCoAuthor(address _coauthor) public onlyAuthor {
    require(!isNullAddress(_coauthor));

    coauthor = _coauthor;
  }

  function setKpopArenaContractAddress(address _address) public onlyAuthors {
    require(!isNullAddress(_address));

    KPOP_ARENA_CONTRACT_ADDRESS = _address;
  }

  function updateTraits(uint _celebId) public onlyArena {
    require(_celebId < totalSupply());

    for (uint i = 0; i < 6; i++) {
      uint booster = celebIdToTraitBoosters[_celebId][i];
      celebIdToTraitValues[_celebId][i] = celebIdToTraitValues[_celebId][i].add(booster);
    }
  }

  /** END FUNCTIONS FOR AUTHORS **/

  function getCeleb(uint _celebId) public view returns (
    string name,
    uint price,
    address owner,
    uint[6] traitValues,
    uint[6] traitBoosters
  ) {
    name = celebs[_celebId].name;
    price = celebIdToPrice[_celebId];
    owner = celebIdToOwner[_celebId];
    traitValues = celebIdToTraitValues[_celebId];
    traitBoosters = celebIdToTraitBoosters[_celebId];
  }

  /** START FUNCTIONS RELATED TO EXTERNAL CONTRACT INTERACTIONS **/

  function approve(address _to, uint _celebId) public {
    require(msg.sender == ownerOf(_celebId));

    celebIdToApprovedRecipient[_celebId] = _to;

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

  function transferFrom(address _from, address _to, uint _celebId) public {
    require(ownerOf(_celebId) == _from);
    require(isApproved(_to, _celebId));
    require(!isNullAddress(_to));

    _transfer(_from, _to, _celebId);
  }

  function takeOwnership(uint _celebId) public {
    require(!isNullAddress(msg.sender));
    require(isApproved(msg.sender, _celebId));

    address currentOwner = celebIdToOwner[_celebId];

    _transfer(currentOwner, msg.sender, _celebId);
  }

  /** END FUNCTIONS RELATED TO EXTERNAL CONTRACT INTERACTIONS **/

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

  /** MODIFIERS **/

  modifier onlyAuthor() {
    require(msg.sender == author);
    _;
  }

  modifier onlyAuthors() {
    require(msg.sender == author || msg.sender == coauthor);
    _;
  }

  modifier onlyArena() {
    require(msg.sender == author || msg.sender == coauthor || msg.sender == KPOP_ARENA_CONTRACT_ADDRESS);
    _;
  }

  /** FUNCTIONS THAT WONT BE USED FREQUENTLY **/

  function setMinStartingPrice(uint _price) public onlyAuthors {
    MIN_STARTING_PRICE = _price;
  }

  function setGrowthBump(uint _bump) public onlyAuthors {
    GROWTH_BUMP = _bump;
  }

  function setPriceIncreaseScale(uint _scale) public onlyAuthors {
    PRICE_INCREASE_SCALE = _scale;
  }

  /** PRIVATE FUNCTIONS **/

  function isApproved(address _to, uint _celebId) private view returns (bool) {
    return celebIdToApprovedRecipient[_celebId] == _to;
  }

  function isNullAddress(address _addr) private pure returns (bool) {
    return _addr == 0x0;
  }
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://b198026ce6dc8eb2bed9c95b0b2ed1b796b740528506ebf888177f040681b3f2

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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.