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/**
 *Submitted for verification at Etherscan.io on 2018-07-02
*/

pragma solidity 0.4.18;

// File: zeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


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


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() 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 transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: zeppelin-solidity/contracts/math/SafeMath.sol

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {
  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;
  }

  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;
  }

  function sub(uint256 a, uint256 b) internal pure returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal pure returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

// File: zeppelin-solidity/contracts/token/ERC20Basic.sol

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  uint256 public totalSupply;
  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);
}

// File: zeppelin-solidity/contracts/token/BasicToken.sol

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

  mapping(address => uint256) balances;

  /**
  * @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]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    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 balance) {
    return balances[_owner];
  }

}

// File: zeppelin-solidity/contracts/token/ERC20.sol

/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
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);
}

// File: zeppelin-solidity/contracts/token/StandardToken.sol

/**
 * @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);
    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;
    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];
  }

  /**
   * 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
   */
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  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);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

// File: zeppelin-solidity/contracts/token/MintableToken.sol

/**
 * @title Mintable token
 * @dev Simple ERC20 Token example, with mintable token creation
 * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-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);
    _;
  }

  /**
   * @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) onlyOwner canMint public returns (bool) {
    totalSupply = totalSupply.add(_amount);
    balances[_to] = balances[_to].add(_amount);
    Mint(_to, _amount);
    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;
    MintFinished();
    return true;
  }
}

// File: contracts/OAKToken.sol

contract OAKToken is MintableToken {
  string public name = "Acorn Collective Token";
  string public symbol = "OAK";
  uint256 public decimals = 18;

  mapping(address => bool) public kycRequired;

  // overriding MintableToken#mint to add kyc logic
  function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) {
    kycRequired[_to] = true;
    return super.mint(_to, _amount);
  }

  // overriding MintableToken#transfer to add kyc logic
  function transfer(address _to, uint _value) public returns (bool) {
    require(!kycRequired[msg.sender]);

    return super.transfer(_to, _value);
  }

  // overriding MintableToken#transferFrom to add kyc logic
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(!kycRequired[_from]);

    return super.transferFrom(_from, _to, _value);
  }

  function kycVerify(address participant) onlyOwner public {
    kycRequired[participant] = false;
    KycVerified(participant);
  }
  event KycVerified(address indexed participant);
}

// File: contracts/Crowdsale.sol

/**
 * @title Crowdsale
 * @dev Crowdsale is a base contract for managing a token crowdsale.
 * Crowdsales have a start and end timestamps, where investors can make
 * token purchases and the crowdsale will assign them tokens based
 * on a token per ETH rate. Funds collected are forwarded to a wallet
 * as they arrive.
 */
contract Crowdsale {
  using SafeMath for uint256;

  // The token being sold
  OAKToken public token;

  // start and end timestamps where investments are allowed (both inclusive)
  uint256 public startTime;
  uint256 public endTime;

  // address where funds are collected
  address public wallet;

  // how many token units a buyer gets per wei
  uint256 public rate;

  // amount of raised money in wei
  uint256 public weiRaised;

  /**
   * event for token purchase logging
   * @param purchaser who paid for the tokens
   * @param beneficiary who got the tokens
   * @param value weis paid for purchase
   * @param amount amount of tokens purchased
   */
  event TokenPurchase(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount);


  function Crowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet) public {
    require(_startTime >= now);
    require(_endTime >= _startTime);
    require(_rate > 0);
    require(_wallet != address(0));

    token = createTokenContract();
    startTime = _startTime;
    endTime = _endTime;
    rate = _rate;
    wallet = _wallet;
  }

  // creates the token to be sold.
  // override this method to have crowdsale of a specific mintable token.
  event CrowdSaleTokenContractCreation();
  // creates the token to be sold.
  function createTokenContract() internal returns (OAKToken) {
    OAKToken newToken = new OAKToken();
    CrowdSaleTokenContractCreation();
    return newToken;
  }


  // fallback function can be used to buy tokens
  function () external payable {
    buyTokens(msg.sender);
  }

  // low level token purchase function
  function buyTokens(address beneficiary) public payable {
    require(beneficiary != address(0));
    require(validPurchase());

    uint256 weiAmount = msg.value;

    // calculate token amount to be created
    uint256 tokens = weiAmount.mul(rate);

    // update state
    weiRaised = weiRaised.add(weiAmount);

    token.mint(beneficiary, tokens);
    TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

    forwardFunds();
  }

  // send ether to the fund collection wallet
  // override to create custom fund forwarding mechanisms
  function forwardFunds() internal {
    wallet.transfer(msg.value);
  }

  // @return true if the transaction can buy tokens
  function validPurchase() internal view returns (bool) {
    bool withinPeriod = now >= startTime && now <= endTime;
    bool nonZeroPurchase = msg.value != 0;
    return withinPeriod && nonZeroPurchase;
  }

  // @return true if crowdsale event has ended
  function hasEnded() public view returns (bool) {
    return now > endTime;
  }


}

// File: contracts/FinalizableCrowdsale.sol

/**
 * @title FinalizableCrowdsale
 * @dev Extension of Crowdsale where an owner can do extra work
 * after finishing.
 */
contract FinalizableCrowdsale is Crowdsale, Ownable {
  using SafeMath for uint256;

  bool public isFinalized = false;

  event Finalized();

  /**
   * @dev Must be called after crowdsale ends, to do some extra finalization
   * work. Calls the contract's finalization function.
   */
  function finalize() onlyOwner public {
    require(!isFinalized);
    require(hasEnded());

    finalization();
    Finalized();

    isFinalized = true;
  }

  /**
   * @dev Can be overridden to add finalization logic. The overriding function
   * should call super.finalization() to ensure the chain of finalization is
   * executed entirely.
   */
  function finalization() internal {
  }
}

// File: zeppelin-solidity/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused);
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused);
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() onlyOwner whenNotPaused public {
    paused = true;
    Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() onlyOwner whenPaused public {
    paused = false;
    Unpause();
  }
}

// File: contracts/OAKTokenCrowdsale.sol

contract OAKTokenCrowdsale is FinalizableCrowdsale, Pausable {

  uint256 public restrictedPercent;
  address public restricted;
  uint256 public soldTokens;
  uint256 public hardCap;
  uint256 public vipRate;

  uint256 public totalTokenSupply;

  mapping(address => bool) public vip;

  //TokenTimelock logic
  uint256 public Y1_lockedTokenReleaseTime;
  uint256 public Y1_lockedTokenAmount;

  uint256 public Y2_lockedTokenReleaseTime;
  uint256 public Y2_lockedTokenAmount;


  // constructor
  function OAKTokenCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, address _wallet) public
  Crowdsale(_startTime, _endTime, _rate, _wallet) {

    // total token supply for sales
    totalTokenSupply = 75000000 * 10 ** 18;

    // hardCap for pre-sale
    hardCap = 7000000 * 10 ** 18;

    vipRate = _rate;
    soldTokens = 0;

    restrictedPercent = 20;
    restricted = msg.sender;
  }

  // update hardCap for sale
  function setHardCap(uint256 _hardCap) public onlyOwner {
    require(!isFinalized);
    require(_hardCap >= 0 && _hardCap <= totalTokenSupply);

    hardCap = _hardCap;
  }

  // update address where funds are collected
  function setWalletAddress(address _wallet) public onlyOwner {
    require(!isFinalized);

    wallet = _wallet;
  }

  // update token units a buyer gets per wei
  function setRate(uint256 _rate) public onlyOwner {
    require(!isFinalized);
    require(_rate > 0);

    rate = _rate;
  }

  // update token units a vip buyer gets per wei
  function setVipRate(uint256 _vipRate) public onlyOwner {
    require(!isFinalized);
    require(_vipRate > 0);

    vipRate = _vipRate;
  }

  // add VIP buyer address
  function setVipAddress(address _address) public onlyOwner {
    vip[_address] = true;
  }

  // remove VIP buyer address
  function unsetVipAddress(address _address) public onlyOwner {
    vip[_address] = false;
  }

  // update startTime, endTime for post-sales
  function setSalePeriod(uint256 _startTime, uint256 _endTime) public onlyOwner {
    require(!isFinalized);
    require(_startTime > 0);
    require(_endTime > _startTime);

    startTime = _startTime;
    endTime = _endTime;
  }

  // fallback function can be used to buy tokens
  function () external payable {
    buyTokens(msg.sender);
  }

  // overriding Crowdsale#buyTokens to add pausable sales and vip logic
  function buyTokens(address beneficiary) public whenNotPaused payable {
    require(beneficiary != address(0));
    require(!isFinalized);

    uint256 weiAmount = msg.value;
    uint tokens;

    if(vip[msg.sender] == true){
      tokens = weiAmount.mul(vipRate);
    }else{
      tokens = weiAmount.mul(rate);
    }
    require(validPurchase(tokens));
    soldTokens = soldTokens.add(tokens);

    // update state
    weiRaised = weiRaised.add(weiAmount);

    token.mint(beneficiary, tokens);
    TokenPurchase(msg.sender, beneficiary, weiAmount, tokens);

    forwardFunds();
  }

  // overriding Crowdsale#validPurchase to add capped sale logic
  // @return true if the transaction can buy tokens
  function validPurchase(uint256 tokens) internal view returns (bool) {
    bool withinPeriod = now >= startTime && now <= endTime;
    bool withinCap = soldTokens.add(tokens) <= hardCap;
    bool withinTotalSupply = soldTokens.add(tokens) <= totalTokenSupply;
    bool nonZeroPurchase = msg.value != 0;
    return withinPeriod && nonZeroPurchase && withinCap && withinTotalSupply;
  }

  // overriding FinalizableCrowdsale#finalization to add 20% of sold token for owner
  function finalization() internal {
    // mint locked token to Crowdsale contract
    uint256 restrictedTokens = soldTokens.div(100).mul(restrictedPercent);
    token.mint(this, restrictedTokens);
    token.kycVerify(this);

    Y1_lockedTokenReleaseTime = now + 1 years;
    Y1_lockedTokenAmount = restrictedTokens.div(2);

    Y2_lockedTokenReleaseTime = now + 2 years;
    Y2_lockedTokenAmount = restrictedTokens.div(2);

    // stop minting new tokens
    token.finishMinting();

    // transfer the contract ownership to OAKTokenCrowdsale.owner
    token.transferOwnership(owner);

  }

  // release the 1st year locked token
  function Y1_release() onlyOwner public {
    require(Y1_lockedTokenAmount > 0);
    require(now > Y1_lockedTokenReleaseTime);

    // transfer the locked token to restricted
    token.transfer(restricted, Y1_lockedTokenAmount);

    Y1_lockedTokenAmount = 0;
  }

  // release the 2nd year locked token
  function Y2_release() onlyOwner public {
    require(Y1_lockedTokenAmount == 0);
    require(Y2_lockedTokenAmount > 0);
    require(now > Y2_lockedTokenReleaseTime);

    uint256 amount = token.balanceOf(this);
    require(amount > 0);

    // transfer the locked token to restricted
    token.transfer(restricted, amount);

    Y2_lockedTokenAmount = 0;
  }

  function kycVerify(address participant) onlyOwner public {
    token.kycVerify(participant);
  }

  function addPrecommitment(address participant, uint balance) onlyOwner public {
    require(!isFinalized);
    require(balance > 0);
    // Check if the total token supply will be exceeded
    require(soldTokens.add(balance) <= totalTokenSupply);

    soldTokens = soldTokens.add(balance);
    token.mint(participant, balance);
  }

}

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