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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)  contract Ownable    - function renounceOwnership()    - function transferOwnership(address _n ...    - function _transferOwnership(address _ ...  contract ERC20Basic    - function totalSupply()    - function balanceOf(address who)    - function transfer(address to, uint256 ...  contract ERC20 is ERC20Basic    - function allowance(address owner, add ...    - function transferFrom(address from, a ...    - function approve(address spender, uin ...  contract BasicToken is ERC20Basic    - function totalSupply()    - function transfer(address _to, uint25 ...    - function balanceOf(address _owner)  contract StandardToken is ERC20, B ...    - function transferFrom(    - function approve(address _spender, ui ...    - function allowance(    - function increaseApproval(    - function decreaseApproval(  contract MintableToken is Standard ...    - function mint(    - function finishMinting()  contract OneledgerToken is Mintabl ... *    - function activate()    - function transfer(address to, uint256 ...    - function transferFrom(address from, a ...  contract ICO is Ownable    - function()    - function updateRate(uint256 rate_)    - function updateWeiCap(uint256 weiCap_ ...    - function buyTokens()    - function addToWhiteList(address[] add ...    - function mintToken(address target, ui ...    - function closeSale()    - function validatePurchase(uint256 wei ...  contract OneledgerTokenVesting is ... *    - function getToken()    - function release()

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/**
 *Submitted for verification at Etherscan.io on 2018-06-13
*/

pragma solidity 0.4.24;


/**
 * @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 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (a == 0) {
      return 0;
    }

    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 a / b;
  }

  /**
  * @dev Subtracts 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 c) {
    c = a + b;
    assert(c >= a);
    return c;
  }
}

contract Ownable {
  address public owner;


  event OwnershipRenounced(address indexed previousOwner);
  event OwnershipTransferred(
    address indexed previousOwner,
    address indexed newOwner
  );


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  constructor() public {
    owner = msg.sender;
  }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Allows the current owner to relinquish control of the contract.
   */
  function renounceOwnership() public onlyOwner {
    emit OwnershipRenounced(owner);
    owner = address(0);
  }

  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function transferOwnership(address _newOwner) public onlyOwner {
    _transferOwnership(_newOwner);
  }

  /**
   * @dev Transfers control of the contract to a newOwner.
   * @param _newOwner The address to transfer ownership to.
   */
  function _transferOwnership(address _newOwner) internal {
    require(_newOwner != address(0));
    emit OwnershipTransferred(owner, _newOwner);
    owner = _newOwner;
  }
}

contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender)
    public view returns (uint256);

  function transferFrom(address from, address to, uint256 value)
    public returns (bool);

  function approve(address spender, uint256 value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  /**
  * @dev total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256) {
    return balances[_owner];
  }

}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address _owner,
    address _spender
   )
    public
    view
    returns (uint256)
  {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint _addedValue
  )
    public
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].add(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(
    address _spender,
    uint _subtractedValue
  )
    public
    returns (bool)
  {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/openzeppelin-solidity/issues/120
 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol
 */
contract MintableToken is StandardToken, Ownable {
  event Mint(address indexed to, uint256 amount);
  event MintFinished();

  bool public mintingFinished = false;


  modifier canMint() {
    require(!mintingFinished);
    _;
  }

  modifier hasMintPermission() {
    require(msg.sender == owner);
    _;
  }

  /**
   * @dev Function to mint tokens
   * @param _to The address that will receive the minted tokens.
   * @param _amount The amount of tokens to mint.
   * @return A boolean that indicates if the operation was successful.
   */
  function mint(
    address _to,
    uint256 _amount
  )
    hasMintPermission
    canMint
    public
    returns (bool)
  {
    totalSupply_ = totalSupply_.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    emit Mint(_to, _amount);
    emit Transfer(address(0), _to, _amount);
    return true;
  }

  /**
   * @dev Function to stop minting new tokens.
   * @return True if the operation was successful.
   */
  function finishMinting() onlyOwner canMint public returns (bool) {
    mintingFinished = true;
    emit MintFinished();
    return true;
  }
}


/**
* @title OneledgerToken
* @dev this is the oneledger token
*/
contract OneledgerToken is MintableToken {
    using SafeMath for uint256;

    string public name = "Oneledger Token";
    string public symbol = "OLT";
    uint8 public decimals = 18;
    bool public active = false;
    /**
     * @dev restrict function to be callable when token is active
     */
    modifier activated() {
        require(active == true);
        _;
    }

    /**
     * @dev activate token transfers
     */
    function activate() public onlyOwner {
        active = true;
    }

    /**
     * @dev transfer    ERC20 standard transfer wrapped with `activated` modifier
     */
    function transfer(address to, uint256 value) public activated returns (bool) {
        return super.transfer(to, value);
    }

    /**
     * @dev transfer    ERC20 standard transferFrom wrapped with `activated` modifier
     */
    function transferFrom(address from, address to, uint256 value) public activated returns (bool) {
        return super.transferFrom(from, to, value);
    }
}

contract ICO is Ownable {
    using SafeMath for uint256;

    struct WhiteListRecord {
        uint256 offeredWei;
        uint256 lastPurchasedTimestamp;
    }

    OneledgerToken public token;
    address public wallet; // Address where funds are collected
    uint256 public rate;   // How many token units a buyer gets per eth
    mapping (address => WhiteListRecord) public whiteList;
    uint256 public initialTime;
    bool public saleClosed;
    uint256 public weiCap;
    uint256 public weiRaised;

    uint256 public TOTAL_TOKEN_SUPPLY = 1000000000 * (10 ** 18);

    event BuyTokens(uint256 weiAmount, uint256 rate, uint256 token, address beneficiary);
    event UpdateRate(uint256 rate);
    event UpdateWeiCap(uint256 weiCap);
    /**
    * @dev constructor
    */
    constructor(address _wallet, uint256 _rate, uint256 _startDate, uint256 _weiCap) public {
        require(_rate > 0);
        require(_wallet != address(0));
        require(_weiCap.mul(_rate) <= TOTAL_TOKEN_SUPPLY);

        wallet = _wallet;
        rate = _rate;
        initialTime = _startDate;
        saleClosed = false;
        weiCap = _weiCap;
        weiRaised = 0;

        token = new OneledgerToken();
    }

    /**
     * @dev fallback function ***DO NOT OVERRIDE***
     */
    function() external payable {
        buyTokens();
    }

    /**
     * @dev update the rate
     */
    function updateRate(uint256 rate_) public onlyOwner {
      require(now <= initialTime);
      rate = rate_;
      emit UpdateRate(rate);
    }

    /**
     * @dev update the weiCap
     */
    function updateWeiCap(uint256 weiCap_) public onlyOwner {
      require(now <= initialTime);
      weiCap = weiCap_;
      emit UpdateWeiCap(weiCap_);
    }

    /**
     * @dev buy tokens
     */
    function buyTokens() public payable {
        validatePurchase(msg.value);
        uint256 tokenToBuy = msg.value.mul(rate);
        whiteList[msg.sender].lastPurchasedTimestamp = now;
        weiRaised = weiRaised.add(msg.value);
        token.mint(msg.sender, tokenToBuy);
        wallet.transfer(msg.value);
        emit BuyTokens(msg.value, rate, tokenToBuy, msg.sender);
    }

    /**
    * @dev add to white list
    * param addresses the list of address added to white list
    * param weiPerContributor the wei can be transfer per contributor
    * param capWei for the user in this list
    */
    function addToWhiteList(address[] addresses, uint256 weiPerContributor) public onlyOwner {
        for (uint32 i = 0; i < addresses.length; i++) {
            whiteList[addresses[i]] = WhiteListRecord(weiPerContributor, 0);
        }
    }

    /**
     * @dev mint token to new address, either contract or a wallet
     * param OneledgerTokenVesting vesting contract
     * param uint256 total token number to mint
    */
    function mintToken(address target, uint256 tokenToMint) public onlyOwner {
      token.mint(target, tokenToMint);
    }

    /**
     * @dev close the ICO
     */
    function closeSale() public onlyOwner {
        saleClosed = true;
        if (TOTAL_TOKEN_SUPPLY > token.totalSupply()) {
          token.mint(owner, TOTAL_TOKEN_SUPPLY.sub(token.totalSupply()));
        }
        token.finishMinting();
        token.transferOwnership(owner);
    }

    function validatePurchase(uint256 weiPaid) internal view{
        require(!saleClosed);
        require(initialTime <= now);
        require(whiteList[msg.sender].offeredWei > 0);
        require(weiPaid <= weiCap.sub(weiRaised));
        // can only purchase once every 24 hours
        require(now.sub(whiteList[msg.sender].lastPurchasedTimestamp) > 24 hours);
        uint256 elapsedTime = now.sub(initialTime);
        // check day 1 buy limit
        require(elapsedTime > 24 hours || msg.value <= whiteList[msg.sender].offeredWei);
        // check day 2 buy limit
        require(elapsedTime > 48 hours || msg.value <= whiteList[msg.sender].offeredWei.mul(2));
    }
}


contract OneledgerTokenVesting is Ownable{
    using SafeMath for uint256;

    event Released(uint256 amount);

    // beneficiary of tokens after they are released
    address public beneficiary;

    uint256 public startFrom;
    uint256 public period;
    uint256 public tokensReleasedPerPeriod;

    uint256 public elapsedPeriods;

    OneledgerToken private token;

    /**
     * @dev Creates a vesting contract for OneledgerToken
     * @param _beneficiary address of the beneficiary to whom vested tokens are transferred
     * @param _startFrom Datetime when the vesting will begin
     * @param _period The preiod to release the token
     * @param _tokensReleasedPerPeriod the token to release per period
     */
    constructor(
        address _beneficiary,
        uint256 _startFrom,
        uint256 _period,
        uint256 _tokensReleasedPerPeriod,
        OneledgerToken _token
    ) public {
        require(_beneficiary != address(0));
        require(_startFrom >= now);

        beneficiary = _beneficiary;
        startFrom = _startFrom;
        period = _period;
        tokensReleasedPerPeriod = _tokensReleasedPerPeriod;
        elapsedPeriods = 0;
        token = _token;
    }

    /**
     *  @dev getToken this may be more convinience for user
     *        to check if their vesting contract is binded with a right token
     * return OneledgerToken
     */
     function getToken() public view returns(OneledgerToken) {
       return token;
     }

    /**
     * @dev release
     * param _token Oneledgertoken that will be released to beneficiary
     */
    function release() public {
        require(msg.sender == owner || msg.sender == beneficiary);
        require(token.balanceOf(this) >= 0 && now >= startFrom);
        uint256 elapsedTime = now.sub(startFrom);
        uint256 periodsInCurrentRelease = elapsedTime.div(period).sub(elapsedPeriods);
        uint256 tokensReadyToRelease = periodsInCurrentRelease.mul(tokensReleasedPerPeriod);
        uint256 amountToTransfer = tokensReadyToRelease > token.balanceOf(this) ? token.balanceOf(this) : tokensReadyToRelease;
        require(amountToTransfer > 0);
        elapsedPeriods = elapsedPeriods.add(periodsInCurrentRelease);
        token.transfer(beneficiary, amountToTransfer);
        emit Released(amountToTransfer);
    }
}

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