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•  contract ERC721
•    - function approve(address _to, uint256 ...
•    - function balanceOf(address _owner)
•    - function implementsERC721()
•    - function ownerOf(uint256 _tokenId)
•    - function takeOwnership(uint256 _token ...
•    - function totalSupply()
•    - function transferFrom(address _from, ...
•    - function transfer(address _to, uint25 ...
•  contract RichToken is ERC721 *
•    - function RichToken()
•    - function approve(
•    - function balanceOf(address _owner)
•    - function createRichContract(string _n ...
•    - function getRichToken(uint256 _tokenI ...
•    - function implementsERC721()
•    - function name()
•    - function ownerOf(uint256 _tokenId)
•    - function payout(address _to)
•    - function purchase(uint256 _tokenId)
•    - function priceOf(uint256 _tokenId)
•    - function setCreator(address _creator)
•    - function symbol()
•    - function takeOwnership(uint256 _token ...
•    - function totalSupply()
•    - function transfer(
•    - function transferFrom(
•    - function _addressNotNull(address _to)
•    - function _approved(address _to, uint2 ...
•    - function _createRich(string _name, ad ...
•    - function _owns(address claimant, uint ...
•    - function _payout(address _to)
•    - function _transfer(address _from, add ...
• library SafeMath
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function add(uint256 a, uint256 b)

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/**
 *Submitted for verification at Etherscan.io on 2018-02-17
*/

pragma solidity ^0.4.18;

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);

}


contract RichToken is ERC721 {

  /*** EVENTS ***/

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

  /// @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 = "RichToken";
  string public constant SYMBOL = "RT";

  uint256 private startingPrice = 10 ether;

  /*** STORAGE ***/

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

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

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

  address public creator;

  /*** DATATYPES ***/
  struct Rich {
    string name;
  }

  Rich[] private richtokens;

  modifier onlyCreator() {
    require(msg.sender == creator);
    _;
  }

  function RichToken() public {
    creator = msg.sender;
  }

  /*** 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));

    richtokenIndexToApproved[_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];
  }

  function createRichContract(string _name) public onlyCreator {
    _createRich(_name, address(this), startingPrice);
  }

  /// @notice Returns all the relevant information about a specific richtoken.
  /// @param _tokenId The tokenId of the richtoken of interest.
  function getRichToken(uint256 _tokenId) public view returns (
    string richtokenName,
    uint256 sellingPrice,
    address owner
  ) {
    Rich storage richtoken = richtokens[_tokenId];
    richtokenName = richtoken.name;
    sellingPrice = richtokenIndexToPrice[_tokenId];
    owner = richtokenIndexToOwner[_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 = richtokenIndexToOwner[_tokenId];
    require(owner != address(0));
  }

  function payout(address _to) public onlyCreator {
    _payout(_to);
  }

  // Allows someone to send ether and obtain the token
  function purchase(uint256 _tokenId) public payable {
    address oldOwner = richtokenIndexToOwner[_tokenId];
    address newOwner = msg.sender;

    uint256 sellingPrice = richtokenIndexToPrice[_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, 92), 100));
    uint256 purchaseExcess = SafeMath.sub(msg.value, sellingPrice);

    richtokenIndexToPrice[_tokenId] = SafeMath.div(SafeMath.mul(sellingPrice, 120), 92);

    _transfer(oldOwner, newOwner, _tokenId);

    // Pay previous tokenOwner if owner is not contract
    if (oldOwner != address(this)) {
      oldOwner.transfer(payment);
    }

    TokenSold(_tokenId, sellingPrice, richtokenIndexToPrice[_tokenId], oldOwner, newOwner, richtokens[_tokenId].name);

    msg.sender.transfer(purchaseExcess);
  }

  function priceOf(uint256 _tokenId) public view returns (uint256 price) {
    return richtokenIndexToPrice[_tokenId];
  }

  function setCreator(address _creator) public onlyCreator {
    require(_creator != address(0));

    creator = _creator;
  }

  /// @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 = richtokenIndexToOwner[_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);
  }

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

  /// For creating Rich Token
  function _createRich(string _name, address _owner, uint256 _price) private {
    Rich memory _richtoken = Rich({
      name: _name
    });
    uint256 newRichId = richtokens.push(_richtoken) - 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(newRichId == uint256(uint32(newRichId)));

    Birth(newRichId, _name, _owner);

    richtokenIndexToPrice[newRichId] = _price;

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

  /// Check for token ownership
  function _owns(address claimant, uint256 _tokenId) private view returns (bool) {
    return claimant == richtokenIndexToOwner[_tokenId];
  }

  /// For paying out balance on contract
  function _payout(address _to) private {
    if (_to == address(0)) {
      creator.transfer(this.balance);
    } else {
      _to.transfer(this.balance);
    }
  }

  /// @dev Assigns ownership of a specific Rich to an address.
  function _transfer(address _from, address _to, uint256 _tokenId) private {
    // Since the number of richtokens is capped to 2^32 we can't overflow this
    ownershipTokenCount[_to]++;
    //transfer ownership
    richtokenIndexToOwner[_tokenId] = _to;

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

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