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Contract Overview
Balance: 1.391756112958835288 Ether
Ether Value: $800.01 (@ $574.82/ETH)
Transactions: 608 txns
Token Contract: John Orion Young (JOY)
 Latest 25 txns from a total Of 608 transactions
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TxHash Age From To Value [TxFee]
0x5b2081b354f6bd5c7aa1160e7509c92c5df2fc377346d56b641bf3fcfd34f68e3 hrs 17 mins ago0xc8c4ab6e1e7dcc4e2957244baba86ed937dc0ee8  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540 Ether0.00023653
0x25d399735edf83bba3a3b807546fe6161769663a83f1115b948468d09b7e8ca012 hrs 23 mins ago0x0436610420446f77e09ce7a106a77adfbb6b09ef  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.081781867364753 Ether0.000265664
0xea76ff56caf38e70be4ce681fe406c440193fb8d8cc88fe06aeb5d8d277f92c71 day 10 hrs ago0x27d5b14f2314fce17afc00b2bc12854aa6551408  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.081781867364753 Ether0.00033208
0x13c33e3c965fa4a2eea81894b713c4af285776b1d3821754527a0a840fa692741 day 11 hrs ago0x530cf036ed4fa58f7301a9c788c9806624cefd19  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.081781867364753 Ether0.000265664
0xaa317056269ef5c68170220c3805a456483fa4b6c0ced45acc296feae90ff5421 day 11 hrs ago0x530cf036ed4fa58f7301a9c788c9806624cefd19  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.041355373916794 Ether0.000265664
0xefbd0fbd067bc0455d4bd70a167292e97cba7f71f9cb826a7519d5fc4ad7793c1 day 12 hrs ago0x5b95bd246e81eca6072e7b4f0875b6855c1e1016  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.115005750981685 Ether0.000569912
0x4e5bf8d5a7186ebca23686140e60a6cd8f7b0f62a3598e7cd3dfa471bc8781071 day 18 hrs ago0x123085670e817602041e58febb243abe01a9a825  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.319821138250917 Ether0.000925488
0xf6a0308a5ca986471e3240dc46850d3ee56520feab10350d28a9b8b57df256ea1 day 18 hrs ago0x163ff3601c7e78c71f19e92b65aa3a46ba855a45  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.22742836497843 Ether0.00122124
0xd317ae5bfc70816776898b07fcb87b98910876dbd5ad7a49f3c1f23b6d98f8ba1 day 18 hrs ago0x123085670e817602041e58febb243abe01a9a825  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.161726837317994 Ether0.000925488
0x3467726a21c0bde37d7b923dcf480e8953dbc0357ea166cde275ad18bb2472671 day 18 hrs ago0x163ff3601c7e78c71f19e92b65aa3a46ba855a45  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.115005750981685 Ether0.00122124
0x374be611b9f270be3353939dbf85e0e2e3a64bd08207246f33e43a944102e4d21 day 18 hrs ago0x123085670e817602041e58febb243abe01a9a825  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.081781867364753 Ether0.000925488
0x8375a68edbda4e388c1c0281278dda91d51921a2dfeca036e00a14bcd4ad8c931 day 18 hrs ago0x123085670e817602041e58febb243abe01a9a825  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.058155994570491 Ether0.000532026
0x9843029e7ac7aaa3f386c3a78aa1f91e89a2cc35a80198a572990b84d31e049b1 day 18 hrs ago0xef764bac8a438e7e498c2e5fccf0f174c3e3f8db  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.06 Ether0.000960895
0x132005c092793f65fd3092feaebee700e27fbe67900baa88bef0a1a0eda0a9ba1 day 18 hrs ago0x163ff3601c7e78c71f19e92b65aa3a46ba855a45  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.041355373916794 Ether0.00122124
0x13cb31e981de7cc1c565e319f970a64f9d92b505ea3a4804db59799c957e2e1b1 day 18 hrs ago0x3632b138a3351270ba5801d1b2e2f79d212d4592  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.019643802610477 Ether0.000338562
0x9b69b30980e9822eb9f3c9b4652431bf37f05d0af0514443e288e994cc9b8cf21 day 18 hrs ago0x3632b138a3351270ba5801d1b2e2f79d212d4592  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.002105263157894 Ether0.000290196
0x21dc3be285b071b45c769e8f9aa0ca8f9c65e654d93027b2ba797e5e3054aa841 day 18 hrs ago0x123085670e817602041e58febb243abe01a9a825  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.019643802610477 Ether0.00076785
0xa45d6278461a0ce3794f75b97387b3395a352dd5cbb693ced46c6a2d8bac64bf1 day 18 hrs ago0x3632b138a3351270ba5801d1b2e2f79d212d4592  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.001 Ether0.00024183
0x9b1931c56935f41a8b5d9c06f8237814886feb2ca05931448a8ec92157cc15ff1 day 18 hrs ago0x93811dabfbee9736035025cba91491d7747cfd47  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.004432132963988 Ether0.000266013
0x5c46216e40da008b0106230327a67bcfa46c5770d067b206f21e55c576e5a5fc1 day 18 hrs ago0xef764bac8a438e7e498c2e5fccf0f174c3e3f8db  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.02 Ether0.000957957
0xe88869cbd0580359f0b9b5f0df2da9d5916a4db516bdc7c50903843fca5a5ba61 day 18 hrs ago0x163ff3601c7e78c71f19e92b65aa3a46ba855a45  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.004432132963988 Ether0.00121785
0x978881b4f88023573ae460d16636214bac26120590c79228e1ea3682a527847c1 day 18 hrs ago0x123085670e817602041e58febb243abe01a9a825  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.002105263157894 Ether0.00072809
0xbbc677015334c15d6e1f88e7074dbba9696c7983abc4641d22e2e3c0f8f4d1da1 day 18 hrs ago0x91e89565a4623bef6bd37e88c97e8177ade9590d  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.001 Ether0.000290196
0x974f96ec1ebca85c7757b0041bfd6ea7fb21d6c57fa31456d5b7a84cb87ea9761 day 18 hrs ago0x93811dabfbee9736035025cba91491d7747cfd47  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540.001 Ether0.00047949
0x14c675c66d7fdcc596514e0006e22a55b19cffc723af51089a3fb85e814c716e1 day 18 hrs ago0x9ae048c47aef066e03593d5edb230e3fa80c3f17  IN   0x96313f2c374f901e3831ea6de67b1165c4f39a540 Ether0.001390776
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 Internal Transactions as a result of Contract Execution
 Latest 25 Internal Txns, Click here to View More View All
ParentTxHash Block Age From To Value
0x25d399735edf83bba3a3b807546fe6161769663a83f1115b948468d09b7e8ca0568217412 hrs 23 mins ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x93811dabfbee9736035025cba91491d7747cfd470.073603680628278544 Ether
0xea76ff56caf38e70be4ce681fe406c440193fb8d8cc88fe06aeb5d8d277f92c756768631 day 10 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x123085670e817602041e58febb243abe01a9a8250.073603680628278544 Ether
0x13c33e3c965fa4a2eea81894b713c4af285776b1d3821754527a0a840fa6927456766871 day 11 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xb823dc506011eedab6f8feecc88806dbfc55ea930.073603680628278544 Ether
0xaa317056269ef5c68170220c3805a456483fa4b6c0ced45acc296feae90ff54256766871 day 11 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xb823dc506011eedab6f8feecc88806dbfc55ea930.037219836525114681 Ether
0xefbd0fbd067bc0455d4bd70a167292e97cba7f71f9cb826a7519d5fc4ad7793c56765411 day 12 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x530cf036ed4fa58f7301a9c788c9806624cefd190.103505175883516701 Ether
0x4e5bf8d5a7186ebca23686140e60a6cd8f7b0f62a3598e7cd3dfa471bc87810756750821 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x163ff3601c7e78c71f19e92b65aa3a46ba855a450.287839024425825784 Ether
0xf6a0308a5ca986471e3240dc46850d3ee56520feab10350d28a9b8b57df256ea56750711 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x123085670e817602041e58febb243abe01a9a8250.204685528480587225 Ether
0xd317ae5bfc70816776898b07fcb87b98910876dbd5ad7a49f3c1f23b6d98f8ba56750641 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x163ff3601c7e78c71f19e92b65aa3a46ba855a450.14555415358619536 Ether
0x3467726a21c0bde37d7b923dcf480e8953dbc0357ea166cde275ad18bb24726756750591 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x123085670e817602041e58febb243abe01a9a8250.103505175883516701 Ether
0x374be611b9f270be3353939dbf85e0e2e3a64bd08207246f33e43a944102e4d256750551 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xef764bac8a438e7e498c2e5fccf0f174c3e3f8db0.073603680628278544 Ether
0x9843029e7ac7aaa3f386c3a78aa1f91e89a2cc35a80198a572990b84d31e049b56750511 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xef764bac8a438e7e498c2e5fccf0f174c3e3f8db0.001844005429508311 Ether
0x9843029e7ac7aaa3f386c3a78aa1f91e89a2cc35a80198a572990b84d31e049b56750511 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x163ff3601c7e78c71f19e92b65aa3a46ba855a450.052340395113442521 Ether
0x132005c092793f65fd3092feaebee700e27fbe67900baa88bef0a1a0eda0a9ba56750481 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x123085670e817602041e58febb243abe01a9a8250.037219836525114681 Ether
0x21dc3be285b071b45c769e8f9aa0ca8f9c65e654d93027b2ba797e5e3054aa8456750441 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xef764bac8a438e7e498c2e5fccf0f174c3e3f8db0.017679422349429474 Ether
0x5c46216e40da008b0106230327a67bcfa46c5770d067b206f21e55c576e5a5fc56750391 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xef764bac8a438e7e498c2e5fccf0f174c3e3f8db0.010669193760023333 Ether
0x5c46216e40da008b0106230327a67bcfa46c5770d067b206f21e55c576e5a5fc56750391 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x163ff3601c7e78c71f19e92b65aa3a46ba855a450.008397725615979001 Ether
0xe88869cbd0580359f0b9b5f0df2da9d5916a4db516bdc7c50903843fca5a5ba656750381 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x123085670e817602041e58febb243abe01a9a8250.003988919667590026 Ether
0x978881b4f88023573ae460d16636214bac26120590c79228e1ea3682a527847c56750341 day 18 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x93811dabfbee9736035025cba91491d7747cfd470.001894736842105263 Ether
0x552c5303f58f6b55aeddd5de32d10c685518a49bf0b5ac01baa17c26d959214b56726582 days 4 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x5b95bd246e81eca6072e7b4f0875b6855c1e10160.073603680628278544 Ether
0x94e7dddfd0eb5b5f924d718f2b30fcd1340ffef658e2890a59ae72a39c36b64a56723782 days 5 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x0436610420446f77e09ce7a106a77adfbb6b09ef0.037219836525114681 Ether
0x5b21ab08e3ccdfbdebd6e8e0b530c54adbc8dfe39ac5d7fbb68115ea6f3459a156719432 days 7 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xcecbe670c11d4d28678955f23e0d2d708d79c8930.037219836525114681 Ether
0x5f7ff6d809a21f54a468bdf49eb468d0640f488d3648448074432e130b59228e56718182 days 8 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x3b0535c602078a22a9954209b3556549c4e5e9870.037219836525114681 Ether
0x5a442f99f46191132898e28d3a59bd607566973618d255e8bec59b982b27814f56689282 days 20 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x11b6a5fe2906f3354145613db0d99ceb51f604c90.052340395113442521 Ether
0x05ef360f06895e0b2baf66b772007c9f2d6801afd127ff639aca5ea9f30138c856678803 days 1 hr ago0x96313f2c374f901e3831ea6de67b1165c4f39a540x123085670e817602041e58febb243abe01a9a8250.103505175883516701 Ether
0xed998271e780f370d5bf53cfbb72f4782d09ff56fb11eaa7d903aa9555311e3e56669183 days 5 hrs ago0x96313f2c374f901e3831ea6de67b1165c4f39a540xf0333b94f895eb5aab3822da376f9cbcfce8a19c0.14555415358619536 Ether
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Contract Source Code Verified (Exact match)
Contract Name: JoyArt
Compiler Version: v0.4.18+commit.9cf6e910
Optimization Enabled: No
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.18;

// inspired by
// https://github.com/axiomzen/cryptokitties-bounty/blob/master/contracts/KittyAccessControl.sol
contract AccessControl {
    /// @dev The addresses of the accounts (or contracts) that can execute actions within each roles
    address public ceoAddress;
    address public cooAddress;

    /// @dev Keeps track whether the contract is paused. When that is true, most actions are blocked
    bool public paused = false;

    /// @dev The AccessControl constructor sets the original C roles of the contract to the sender account
    function AccessControl() public {
        ceoAddress = msg.sender;
        cooAddress = msg.sender;
    }

    /// @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);
        _;
    }

    /// @dev Access modifier for any CLevel functionality
    modifier onlyCLevel() {
        require(msg.sender == ceoAddress || msg.sender == cooAddress);
        _;
    }

    /// @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 CEO
    /// @param _newCOO The address of the new COO
    function setCOO(address _newCOO) public onlyCEO {
        require(_newCOO != address(0));
        cooAddress = _newCOO;
    }

    /// @dev Modifier to allow actions only when the contract IS NOT paused
    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    /// @dev Modifier to allow actions only when the contract IS paused
    modifier whenPaused {
        require(paused);
        _;
    }

    /// @dev Pause the smart contract. Only can be called by the CEO
    function pause() public onlyCEO whenNotPaused {
        paused = true;
    }

    /// @dev Unpauses the smart contract. Only can be called by the CEO
    function unpause() public onlyCEO whenPaused {
        paused = false;
    }
}


/**
 * Interface for required functionality in the ERC721 standard
 * for non-fungible tokens.
 *
 * Author: Nadav Hollander (nadav at dharma.io)
 * https://github.com/dharmaprotocol/NonFungibleToken/blob/master/contracts/ERC721.sol
 */
contract ERC721 {
    // Events
    event Transfer(address indexed _from, address indexed _to, uint256 _tokenId);
    event Approval(address indexed _owner, address indexed _approved, uint256 _tokenId);

    /// For querying totalSupply of token.
    function totalSupply() public view returns (uint256 _totalSupply);

    /// 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);

    /// 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);

    /// @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;

    // NOT IMPLEMENTED
    // function getApproved(uint256 _tokenId) public view returns (address _approved);

    /// 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;

    /// Owner initates the transfer of the token to another account.
    /// @param _to The address of the recipient, can be a user or contract.
    /// @param _tokenId The ID of the token to transfer.
    /// @dev Required for ERC-721 compliance.
    function transfer(address _to, uint256 _tokenId) public;

    ///
    function implementsERC721() public view returns (bool _implementsERC721);

    // EXTRA
    /// @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;
}


contract DetailedERC721 is ERC721 {
    function name() public view returns (string _name);
    function symbol() public view returns (string _symbol);
}

contract JoyArt is AccessControl, DetailedERC721 {
    using SafeMath for uint256;

    event TokenCreated(uint256 tokenId, string name, uint256 price, address owner);
    event TokenSold(
        uint256 indexed tokenId,
        string name,
        uint256 sellingPrice,
        uint256 newPrice,
        address indexed oldOwner,
        address indexed newOwner
    );

    mapping (uint256 => address) private tokenIdToOwner;
    mapping (uint256 => uint256) private tokenIdToPrice;
    mapping (address => uint256) private ownershipTokenCount;
    mapping (uint256 => address) private tokenIdToApproved;

    struct Art {
        string name;
    }

    Art[] private artworks;

    uint256 private startingPrice = 0.001 ether;
    bool private erc721Enabled = false;

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

    function createToken(string _name, address _owner, uint256 _price) public onlyCLevel {
        require(_owner != address(0));
        require(_price >= startingPrice);

        _createToken(_name, _owner, _price);
    }

    function createToken(string _name) public onlyCLevel {

        _createToken(_name, address(this), startingPrice);
    }

    function _createToken(string _name, address _owner, uint256 _price) private {
        Art memory _art = Art({
            name: _name
        });
        uint256 newTokenId = artworks.push(_art) - 1;
        tokenIdToPrice[newTokenId] = _price;

        TokenCreated(newTokenId, _name, _price, _owner);

        _transfer(address(0), _owner, newTokenId);
    }

    function getToken(uint256 _tokenId) public view returns (
        string _tokenName,
        uint256 _price,
        uint256 _nextPrice,
        address _owner
    ) {
        _tokenName = artworks[_tokenId].name;
        _price = tokenIdToPrice[_tokenId];
        _nextPrice = nextPriceOf(_tokenId);
        _owner = tokenIdToOwner[_tokenId];
    }

    function getAllTokens() public view returns (
        uint256[],
        uint256[],
        address[]
    ) {
        uint256 total = totalSupply();
        uint256[] memory prices = new uint256[](total);
        uint256[] memory nextPrices = new uint256[](total);
        address[] memory owners = new address[](total);

        for (uint256 i = 0; i < total; i++) {
            prices[i] = tokenIdToPrice[i];
            nextPrices[i] = nextPriceOf(i);
            owners[i] = tokenIdToOwner[i];
        }

        return (prices, nextPrices, owners);
    }

    function tokensOf(address _owner) public view returns(uint256[]) {
        uint256 tokenCount = balanceOf(_owner);
        if (tokenCount == 0) {
            return new uint256[](0);
        } else {
            uint256[] memory result = new uint256[](tokenCount);
            uint256 total = totalSupply();
            uint256 resultIndex = 0;

            for (uint256 i = 0; i < total; i++) {
                if (tokenIdToOwner[i] == _owner) {
                    result[resultIndex] = i;
                    resultIndex++;
                }
            }
            return result;
        }
    }

    function withdrawBalance(address _to, uint256 _amount) public onlyCEO {
        require(_amount <= this.balance);
 
        uint256 amountToWithdraw = _amount;
 
        if (amountToWithdraw == 0) {
            amountToWithdraw = this.balance;
        }
 
        if(_to == address(0)) {
            ceoAddress.transfer(amountToWithdraw);
        } else {
            _to.transfer(amountToWithdraw);
        }
    }

    function purchase(uint256 _tokenId) public payable whenNotPaused {
        address oldOwner = ownerOf(_tokenId);
        address newOwner = msg.sender;
        uint256 sellingPrice = priceOf(_tokenId);

        require(oldOwner != address(0));
        require(newOwner != address(0));
        require(oldOwner != newOwner);
        require(!_isContract(newOwner));
        require(sellingPrice > 0);
        require(msg.value >= sellingPrice);

        _transfer(oldOwner, newOwner, _tokenId);
        tokenIdToPrice[_tokenId] = nextPriceOf(_tokenId);
        TokenSold(
            _tokenId,
            artworks[_tokenId].name,
            sellingPrice,
            priceOf(_tokenId),
            oldOwner,
            newOwner
        );

        uint256 excess = msg.value.sub(sellingPrice);
        uint256 contractCut = sellingPrice.mul(10).div(100); // 10% cut

        if (oldOwner != address(this)) {
            oldOwner.transfer(sellingPrice.sub(contractCut));
        }

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

    function priceOf(uint256 _tokenId) public view returns (uint256 _price) {
        return tokenIdToPrice[_tokenId];
    }

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

    function nextPriceOf(uint256 _tokenId) public view returns (uint256 _nextPrice) {
        uint256 _price = priceOf(_tokenId);
        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 enableERC721() public onlyCEO {
        erc721Enabled = true;
    }

    function totalSupply() public view returns (uint256 _totalSupply) {
        _totalSupply = artworks.length;
    }

    function balanceOf(address _owner) public view returns (uint256 _balance) {
        _balance = ownershipTokenCount[_owner];
    }

    function ownerOf(uint256 _tokenId) public view returns (address _owner) {
        _owner = tokenIdToOwner[_tokenId];
    }

    function approve(address _to, uint256 _tokenId) public whenNotPaused onlyERC721 {
        require(_owns(msg.sender, _tokenId));
        tokenIdToApproved[_tokenId] = _to;
        Approval(msg.sender, _to, _tokenId);
    }

    function transferFrom(address _from, address _to, uint256 _tokenId) public whenNotPaused onlyERC721 {
        require(_to != address(0));
        require(_owns(_from, _tokenId));
        require(_approved(msg.sender, _tokenId));

        _transfer(_from, _to, _tokenId);
    }

    function transfer(address _to, uint256 _tokenId) public whenNotPaused onlyERC721 {
        require(_to != address(0));
        require(_owns(msg.sender, _tokenId));

        _transfer(msg.sender, _to, _tokenId);
    }

    function implementsERC721() public view whenNotPaused returns (bool) {
        return erc721Enabled;
    }

    function takeOwnership(uint256 _tokenId) public whenNotPaused onlyERC721 {
        require(_approved(msg.sender, _tokenId));
        _transfer(tokenIdToOwner[_tokenId], msg.sender, _tokenId);
    }

    function name() public view returns (string _name) {
        _name = "John Orion Young";
    }

    function symbol() public view returns (string _symbol) {
        _symbol = "JOY";
    }

    function _owns(address _claimant, uint256 _tokenId) private view returns (bool) {
        return tokenIdToOwner[_tokenId] == _claimant;
    }

    function _approved(address _to, uint256 _tokenId) private view returns (bool) {
        return tokenIdToApproved[_tokenId] == _to;
    }

    function _transfer(address _from, address _to, uint256 _tokenId) private {
        ownershipTokenCount[_to]++;
        tokenIdToOwner[_tokenId] = _to;

        if (_from != address(0)) {
            ownershipTokenCount[_from]--;
            delete tokenIdToApproved[_tokenId];
        }

        Transfer(_from, _to, _tokenId);
    }

    function _isContract(address addr) private view returns (bool) {
        uint256 size;
        assembly { size := extcodesize(addr) }
        return size > 0;
    }
}


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 ABI  
[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"_name","type":"string"}],"payable":false,"stateMutability":"view","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":"ceoAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_amount","type":"uint256"}],"name":"withdrawBalance","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"implementsERC721","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"_totalSupply","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newCEO","type":"address"}],"name":"setCEO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getAllTokens","outputs":[{"name":"","type":"uint256[]"},{"name":"","type":"uint256[]"},{"name":"","type":"address[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_newCOO","type":"address"}],"name":"setCOO","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_name","type":"string"}],"name":"createToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"tokensOf","outputs":[{"name":"","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"nextPriceOf","outputs":[{"name":"_nextPrice","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"name":"_owner","type":"address"}],"payable":false,"stateMutability":"view","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":"_name","type":"string"},{"name":"_owner","type":"address"},{"name":"_price","type":"uint256"}],"name":"createToken","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"_symbol","type":"string"}],"payable":false,"stateMutability":"view","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":"cooAddress","outputs":[{"name":"","type":"address"}],"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":"_tokenId","type":"uint256"}],"name":"priceOf","outputs":[{"name":"_price","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"getToken","outputs":[{"name":"_tokenName","type":"string"},{"name":"_price","type":"uint256"},{"name":"_nextPrice","type":"uint256"},{"name":"_owner","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_tokenId","type":"uint256"}],"name":"purchase","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"tokenId","type":"uint256"},{"indexed":false,"name":"name","type":"string"},{"indexed":false,"name":"price","type":"uint256"},{"indexed":false,"name":"owner","type":"address"}],"name":"TokenCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"tokenId","type":"uint256"},{"indexed":false,"name":"name","type":"string"},{"indexed":false,"name":"sellingPrice","type":"uint256"},{"indexed":false,"name":"newPrice","type":"uint256"},{"indexed":true,"name":"oldOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"TokenSold","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"}]

  Contract Creation Code Switch To Opcodes View
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   Swarm Source:
bzzr://4850b130b0c9b696394f163b2b258082bf46c0d80841967bdba5480b36caa79b

 

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