Contract Source Code (Solidity)

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Outline

• interface IWhitelist
•    - function detectTransferRestriction(
•    - function messageForTransferRestrictio ...
•    - function authorizeTransfer(
•    - function activateWallet(
•    - function deactivateWallet(
•    - function walletActivated(
• interface IERC20Detailed
•    - function decimals()
•    - function name()
•    - function symbol()
• library SafeMath
•    - function add(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b)
•    - function sub(uint256 a, uint256 b, st ...
•    - function mul(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b)
•    - function div(uint256 a, uint256 b, st ...
•    - function mod(uint256 a, uint256 b)
•    - function mod(uint256 a, uint256 b, st ...
• library BigDiv
•    - function bigDiv2x1(
•    - function bigDiv2x1RoundUp(
•    - function bigDiv2x2(
• library Sqrt
•    - function sqrt(uint x)
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
• library Address
•    - function isContract(address account)
•    - function toPayable(address account)
•    - function sendValue(address payable re ...
• library SafeERC20
•    - function safeTransfer(IERC20 token, a ...
•    - function safeTransferFrom(IERC20 toke ...
•    - function safeApprove(IERC20 token, ad ...
•    - function safeIncreaseAllowance(IERC20 ...
•    - function safeDecreaseAllowance(IERC20 ...
•    - function callOptionalReturn(IERC20 to ...
•  contract Initializable
•    - function isConstructor()
•  contract Context is Initializable
•    - function _msgSender()
•    - function _msgData()
•  contract ERC20 is Initializable, C ...
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•    - function _transfer(address sender, ad ...
•    - function _mint(address account, uint2 ...
•    - function _burn(address account, uint2 ...
•    - function _approve(address owner, addr ...
•    - function _burnFrom(address account, u ...
• library Roles
•    - function add(Role storage role, addre ...
•    - function remove(Role storage role, ad ...
•    - function has(Role storage role, addre ...
•  contract MinterRole is Initializab ...
•    - function initialize(address sender)
•    - function isMinter(address account)
•    - function addMinter(address account)
•    - function renounceMinter()
•    - function _addMinter(address account)
•    - function _removeMinter(address accoun ...
•  contract ERC20Mintable is Initiali ...
•    - function initialize(address sender)
•    - function mint(address account, uint25 ...
•  contract ERC20Capped is Initializa ...
•    - function initialize(uint256 cap, addr ...
•    - function cap()
•    - function _mint(address account, uint2 ...
•  contract PauserRole is Initializab ...
•    - function initialize(address sender)
•    - function isPauser(address account)
•    - function addPauser(address account)
•    - function renouncePauser()
•    - function _addPauser(address account)
•    - function _removePauser(address accoun ...
•  contract Pausable is Initializable ...
•    - function initialize(address sender)
•    - function paused()
•    - function pause()
•    - function unpause()
•  contract ERC20Pausable is Initiali ...
•    - function initialize(address sender)
•    - function transfer(address to, uint256 ...
•    - function transferFrom(address from, a ...
•    - function approve(address spender, uin ...
•    - function increaseAllowance(address sp ...
•    - function decreaseAllowance(address sp ...
•  contract ContinuousOffering is ERC ...
•    - function buybackReserve()
•    - function _transfer(
•    - function _burn(
•    - function _mint(
•    - function _collectInvestment(
•    - function _transferCurrency(
•    - function _initialize(
•    - function initializeDomainSeparator()
•    - function _updateConfig(
•    - function burn(
•    - function burnFrom(
•    - function _distributeInvestment(uint _ ...
•    - function estimateBuyValue(
•    - function _buy(
•    - function buy(
•    - function permitBuy(
•    - function estimateSellValue(
•    - function _sell(
•    - function sell(
•    - function permitSell(
•    - function _close()
•    - function permit(
•    - function name()
•    - function symbol()
•    - function decimals()
•  contract VisionToken is Continuous ... *
•    - function revenueCommitmentBasisPoints ...
•    - function investmentReserveBasisPoints ...
•    - function runStartedOn()
•    - function initialize(
•    - function estimateExitFee(uint _msgVal ...
•    - function close()
•    - function pay(uint _currencyValue)
•    - function()
•    - function updateConfig(
•    - function initializeRunStartedOn(
•    - function _distributeInvestment(

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/**
 *Submitted for verification at Etherscan.io on 2020-11-16
*/

pragma solidity 0.5.17;


/**
 * Source: https://raw.githubusercontent.com/simple-restricted-token/reference-implementation/master/contracts/token/ERC1404/ERC1404.sol
 * With ERC-20 APIs removed (will be implemented as a separate contract).
 * And adding authorizeTransfer.
 */
interface IWhitelist {
  /**
   * @notice Detects if a transfer will be reverted and if so returns an appropriate reference code
   * @param from Sending address
   * @param to Receiving address
   * @param value Amount of tokens being transferred
   * @return Code by which to reference message for rejection reasoning
   * @dev Overwrite with your custom transfer restriction logic
   */
  function detectTransferRestriction(
    address from,
    address to,
    uint value
  ) external view returns (uint8);

  /**
   * @notice Returns a human-readable message for a given restriction code
   * @param restrictionCode Identifier for looking up a message
   * @return Text showing the restriction's reasoning
   * @dev Overwrite with your custom message and restrictionCode handling
   */
  function messageForTransferRestriction(uint8 restrictionCode)
    external
    pure
    returns (string memory);

  /**
   * @notice Called by the DAT contract before a transfer occurs.
   * @dev This call will revert when the transfer is not authorized.
   * This is a mutable call to allow additional data to be recorded,
   * such as when the user aquired their tokens.
   */
  function authorizeTransfer(
    address _from,
    address _to,
    uint _value,
    bool _isSell
  ) external;

  function activateWallet(
    address _wallet
  ) external;

  function deactivateWallet(
    address _wallet
  ) external;

  function walletActivated(
    address _wallet
  ) external returns(bool);
}

interface IERC20Detailed {
  /**
   * @dev Returns the number of decimals used to get its user representation.
   * For example, if `decimals` equals `2`, a balance of `505` tokens should
   * be displayed to a user as `5,05` (`505 / 10 ** 2`).
   *
   * Tokens usually opt for a value of 18, imitating the relationship between
   * Ether and Wei.
   *
   * NOTE: This information is only used for _display_ purposes: it in
   * no way affects any of the arithmetic of the contract, including
   * {IERC20-balanceOf} and {IERC20-transfer}.
   */
  function decimals() external view returns (uint8);

  function name() external view returns (string memory);

  function symbol() external view returns (string memory);

}

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     * - Subtraction cannot overflow.
     *
     * _Available since v2.4.0._
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     * - The divisor cannot be zero.
     *
     * _Available since v2.4.0._
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

/**
 * @title Reduces the size of terms before multiplication, to avoid an overflow, and then
 * restores the proper size after division.
 * @notice This effectively allows us to overflow values in the numerator and/or denominator
 * of a fraction, so long as the end result does not overflow as well.
 * @dev Results may be off by 1 + 0.000001% for 2x1 calls and 2 + 0.00001% for 2x2 calls.
 * Do not use if your contract expects very small result values to be accurate.
 */
library BigDiv {
  using SafeMath for uint;

  /// @notice The max possible value
  uint private constant MAX_UINT = 2**256 - 1;

  /// @notice When multiplying 2 terms <= this value the result won't overflow
  uint private constant MAX_BEFORE_SQUARE = 2**128 - 1;

  /// @notice The max error target is off by 1 plus up to 0.000001% error
  /// for bigDiv2x1 and that `* 2` for bigDiv2x2
  uint private constant MAX_ERROR = 100000000;

  /// @notice A larger error threshold to use when multiple rounding errors may apply
  uint private constant MAX_ERROR_BEFORE_DIV = MAX_ERROR * 2;

  /**
   * @notice Returns the approx result of `a * b / d` so long as the result is <= MAX_UINT
   * @param _numA the first numerator term
   * @param _numB the second numerator term
   * @param _den the denominator
   * @return the approx result with up to off by 1 + MAX_ERROR, rounding down if needed
   */
  function bigDiv2x1(
    uint _numA,
    uint _numB,
    uint _den
  ) internal pure returns (uint) {
    if (_numA == 0 || _numB == 0) {
      // would div by 0 or underflow if we don't special case 0
      return 0;
    }

    uint value;

    if (MAX_UINT / _numA >= _numB) {
      // a*b does not overflow, return exact math
      value = _numA * _numB;
      value /= _den;
      return value;
    }

    // Sort numerators
    uint numMax = _numB;
    uint numMin = _numA;
    if (_numA > _numB) {
      numMax = _numA;
      numMin = _numB;
    }

    value = numMax / _den;
    if (value > MAX_ERROR) {
      // _den is small enough to be MAX_ERROR or better w/o a factor
      value = value.mul(numMin);
      return value;
    }

    // formula = ((a / f) * b) / (d / f)
    // factor >= a / sqrt(MAX) * (b / sqrt(MAX))
    uint factor = numMin - 1;
    factor /= MAX_BEFORE_SQUARE;
    factor += 1;
    uint temp = numMax - 1;
    temp /= MAX_BEFORE_SQUARE;
    temp += 1;
    if (MAX_UINT / factor >= temp) {
      factor *= temp;
      value = numMax / factor;
      if (value > MAX_ERROR_BEFORE_DIV) {
        value = value.mul(numMin);
        temp = _den - 1;
        temp /= factor;
        temp = temp.add(1);
        value /= temp;
        return value;
      }
    }

    // formula: (a / (d / f)) * (b / f)
    // factor: b / sqrt(MAX)
    factor = numMin - 1;
    factor /= MAX_BEFORE_SQUARE;
    factor += 1;
    value = numMin / factor;
    temp = _den - 1;
    temp /= factor;
    temp += 1;
    temp = numMax / temp;
    value = value.mul(temp);
    return value;
  }

  /**
   * @notice Returns the approx result of `a * b / d` so long as the result is <= MAX_UINT
   * @param _numA the first numerator term
   * @param _numB the second numerator term
   * @param _den the denominator
   * @return the approx result with up to off by 1 + MAX_ERROR, rounding down if needed
   * @dev roundUp is implemented by first rounding down and then adding the max error to the result
   */
  function bigDiv2x1RoundUp(
    uint _numA,
    uint _numB,
    uint _den
  ) internal pure returns (uint) {
    // first get the rounded down result
    uint value = bigDiv2x1(_numA, _numB, _den);

    if (value == 0) {
      // when the value rounds down to 0, assume up to an off by 1 error
      return 1;
    }

    // round down has a max error of MAX_ERROR, add that to the result
    // for a round up error of <= MAX_ERROR
    uint temp = value - 1;
    temp /= MAX_ERROR;
    temp += 1;
    if (MAX_UINT - value < temp) {
      // value + error would overflow, return MAX
      return MAX_UINT;
    }

    value += temp;

    return value;
  }

  /**
   * @notice Returns the approx result of `a * b / (c * d)` so long as the result is <= MAX_UINT
   * @param _numA the first numerator term
   * @param _numB the second numerator term
   * @param _denA the first denominator term
   * @param _denB the second denominator term
   * @return the approx result with up to off by 2 + MAX_ERROR*10 error, rounding down if needed
   * @dev this uses bigDiv2x1 and adds additional rounding error so the max error of this
   * formula is larger
   */
  function bigDiv2x2(
    uint _numA,
    uint _numB,
    uint _denA,
    uint _denB
  ) internal pure returns (uint) {
    if (MAX_UINT / _denA >= _denB) {
      // denA*denB does not overflow, use bigDiv2x1 instead
      return bigDiv2x1(_numA, _numB, _denA * _denB);
    }

    if (_numA == 0 || _numB == 0) {
      // would div by 0 or underflow if we don't special case 0
      return 0;
    }

    // Sort denominators
    uint denMax = _denB;
    uint denMin = _denA;
    if (_denA > _denB) {
      denMax = _denA;
      denMin = _denB;
    }

    uint value;

    if (MAX_UINT / _numA >= _numB) {
      // a*b does not overflow, use `a / d / c`
      value = _numA * _numB;
      value /= denMin;
      value /= denMax;
      return value;
    }

    // `ab / cd` where both `ab` and `cd` would overflow

    // Sort numerators
    uint numMax = _numB;
    uint numMin = _numA;
    if (_numA > _numB) {
      numMax = _numA;
      numMin = _numB;
    }

    // formula = (a/d) * b / c
    uint temp = numMax / denMin;
    if (temp > MAX_ERROR_BEFORE_DIV) {
      return bigDiv2x1(temp, numMin, denMax);
    }

    // formula: ((a/f) * b) / d then either * f / c or / c * f
    // factor >= a / sqrt(MAX) * (b / sqrt(MAX))
    uint factor = numMin - 1;
    factor /= MAX_BEFORE_SQUARE;
    factor += 1;
    temp = numMax - 1;
    temp /= MAX_BEFORE_SQUARE;
    temp += 1;
    if (MAX_UINT / factor >= temp) {
      factor *= temp;

      value = numMax / factor;
      if (value > MAX_ERROR_BEFORE_DIV) {
        value = value.mul(numMin);
        value /= denMin;
        if (value > 0 && MAX_UINT / value >= factor) {
          value *= factor;
          value /= denMax;
          return value;
        }
      }
    }

    // formula: (a/f) * b / ((c*d)/f)
    // factor >= c / sqrt(MAX) * (d / sqrt(MAX))
    factor = denMin;
    factor /= MAX_BEFORE_SQUARE;
    temp = denMax;
    // + 1 here prevents overflow of factor*temp
    temp /= MAX_BEFORE_SQUARE + 1;
    factor *= temp;
    return bigDiv2x1(numMax / factor, numMin, MAX_UINT);
  }
}

/**
 * @title Calculates the square root of a given value.
 * @dev Results may be off by 1.
 */
library Sqrt {
  /// @notice The max possible value
  uint private constant MAX_UINT = 2**256 - 1;

  // Source: https://github.com/ethereum/dapp-bin/pull/50
  function sqrt(uint x) internal pure returns (uint y) {
    if (x == 0) {
      return 0;
    } else if (x <= 3) {
      return 1;
    } else if (x == MAX_UINT) {
      // Without this we fail on x + 1 below
      return 2**128 - 1;
    }

    uint z = (x + 1) / 2;
    y = x;
    while (z < y) {
      y = z;
      z = (x / z + z) / 2;
    }
  }
}

/**
 * @dev Interface of the ERC20 standard as defined in the EIP. Does not include
 * the optional functions; to access them see {ERC20Detailed}.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: 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
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following 
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
        // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
        // for accounts without code, i.e. `keccak256('')`
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != accountHash && codehash != 0x0);
    }

    /**
     * @dev Converts an `address` into `address payable`. Note that this is
     * simply a type cast: the actual underlying value is not changed.
     *
     * _Available since v2.4.0._
     */
    function toPayable(address account) internal pure returns (address payable) {
        return address(uint160(account));
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     *
     * _Available since v2.4.0._
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-call-value
        (bool success, ) = recipient.call.value(amount)("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
}

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using SafeMath for uint256;
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        // solhint-disable-next-line max-line-length
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).add(value);
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero");
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance));
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves.

        // A Solidity high level call has three parts:
        //  1. The target address is checked to verify it contains contract code
        //  2. The call itself is made, and success asserted
        //  3. The return value is decoded, which in turn checks the size of the returned data.
        // solhint-disable-next-line max-line-length
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

/**
 * @title Initializable
 *
 * @dev Helper contract to support initializer functions. To use it, replace
 * the constructor with a function that has the `initializer` modifier.
 * WARNING: Unlike constructors, initializer functions must be manually
 * invoked. This applies both to deploying an Initializable contract, as well
 * as extending an Initializable contract via inheritance.
 * WARNING: When used with inheritance, manual care must be taken to not invoke
 * a parent initializer twice, or ensure that all initializers are idempotent,
 * because this is not dealt with automatically as with constructors.
 */
contract Initializable {

  /**
   * @dev Indicates that the contract has been initialized.
   */
  bool private initialized;

  /**
   * @dev Indicates that the contract is in the process of being initialized.
   */
  bool private initializing;

  /**
   * @dev Modifier to use in the initializer function of a contract.
   */
  modifier initializer() {
    require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized");

    bool isTopLevelCall = !initializing;
    if (isTopLevelCall) {
      initializing = true;
      initialized = true;
    }

    _;

    if (isTopLevelCall) {
      initializing = false;
    }
  }

  /// @dev Returns true if and only if the function is running in the constructor
  function isConstructor() private view returns (bool) {
    // extcodesize checks the size of the code stored in an address, and
    // address returns the current address. Since the code is still not
    // deployed when running a constructor, any checks on its code size will
    // yield zero, making it an effective way to detect if a contract is
    // under construction or not.
    address self = address(this);
    uint256 cs;
    assembly { cs := extcodesize(self) }
    return cs == 0;
  }

  // Reserved storage space to allow for layout changes in the future.
  uint256[50] private ______gap;
}

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
contract Context is Initializable {
    // Empty internal constructor, to prevent people from mistakenly deploying
    // an instance of this contract, which should be used via inheritance.
    constructor () internal { }
    // solhint-disable-previous-line no-empty-blocks

    function _msgSender() internal view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20Mintable}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Initializable, Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

    mapping (address => mapping (address => uint256)) private _allowances;

    uint256 private _totalSupply;

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20};
     *
     * Requirements:
     * - `sender` and `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     * - the caller must have allowance for `sender`'s tokens of at least
     * `amount`.
     */
    function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue));
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply = _totalSupply.add(amount);
        _balances[account] = _balances[account].add(amount);
        emit Transfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: burn from the zero address");

        _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
        _totalSupply = _totalSupply.sub(amount);
        emit Transfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
     *
     * This is internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`.`amount` is then deducted
     * from the caller's allowance.
     *
     * See {_burn} and {_approve}.
     */
    function _burnFrom(address account, uint256 amount) internal {
        _burn(account, amount);
        _approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
    }

    uint256[50] private ______gap;
}

/**
 * @title Roles
 * @dev Library for managing addresses assigned to a Role.
 */
library Roles {
    struct Role {
        mapping (address => bool) bearer;
    }

    /**
     * @dev Give an account access to this role.
     */
    function add(Role storage role, address account) internal {
        require(!has(role, account), "Roles: account already has role");
        role.bearer[account] = true;
    }

    /**
     * @dev Remove an account's access to this role.
     */
    function remove(Role storage role, address account) internal {
        require(has(role, account), "Roles: account does not have role");
        role.bearer[account] = false;
    }

    /**
     * @dev Check if an account has this role.
     * @return bool
     */
    function has(Role storage role, address account) internal view returns (bool) {
        require(account != address(0), "Roles: account is the zero address");
        return role.bearer[account];
    }
}

contract MinterRole is Initializable, Context {
    using Roles for Roles.Role;

    event MinterAdded(address indexed account);
    event MinterRemoved(address indexed account);

    Roles.Role private _minters;

    function initialize(address sender) public initializer {
        if (!isMinter(sender)) {
            _addMinter(sender);
        }
    }

    modifier onlyMinter() {
        require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role");
        _;
    }

    function isMinter(address account) public view returns (bool) {
        return _minters.has(account);
    }

    function addMinter(address account) public onlyMinter {
        _addMinter(account);
    }

    function renounceMinter() public {
        _removeMinter(_msgSender());
    }

    function _addMinter(address account) internal {
        _minters.add(account);
        emit MinterAdded(account);
    }

    function _removeMinter(address account) internal {
        _minters.remove(account);
        emit MinterRemoved(account);
    }

    uint256[50] private ______gap;
}

/**
 * @dev Extension of {ERC20} that adds a set of accounts with the {MinterRole},
 * which have permission to mint (create) new tokens as they see fit.
 *
 * At construction, the deployer of the contract is the only minter.
 */
contract ERC20Mintable is Initializable, ERC20, MinterRole {
    function initialize(address sender) public initializer {
        MinterRole.initialize(sender);
    }

    /**
     * @dev See {ERC20-_mint}.
     *
     * Requirements:
     *
     * - the caller must have the {MinterRole}.
     */
    function mint(address account, uint256 amount) public onlyMinter returns (bool) {
        _mint(account, amount);
        return true;
    }

    uint256[50] private ______gap;
}

/**
 * @dev Extension of {ERC20Mintable} that adds a cap to the supply of tokens.
 */
contract ERC20Capped is Initializable, ERC20Mintable {
    uint256 private _cap;

    /**
     * @dev Sets the value of the `cap`. This value is immutable, it can only be
     * set once during construction.
     */
    function initialize(uint256 cap, address sender) public initializer {
        ERC20Mintable.initialize(sender);

        require(cap > 0, "ERC20Capped: cap is 0");
        _cap = cap;
    }

    /**
     * @dev Returns the cap on the token's total supply.
     */
    function cap() public view returns (uint256) {
        return _cap;
    }

    /**
     * @dev See {ERC20Mintable-mint}.
     *
     * Requirements:
     *
     * - `value` must not cause the total supply to go over the cap.
     */
    function _mint(address account, uint256 value) internal {
        require(totalSupply().add(value) <= _cap, "ERC20Capped: cap exceeded");
        super._mint(account, value);
    }

    uint256[50] private ______gap;
}

contract PauserRole is Initializable, Context {
    using Roles for Roles.Role;

    event PauserAdded(address indexed account);
    event PauserRemoved(address indexed account);

    Roles.Role private _pausers;

    function initialize(address sender) public initializer {
        if (!isPauser(sender)) {
            _addPauser(sender);
        }
    }

    modifier onlyPauser() {
        require(isPauser(_msgSender()), "PauserRole: caller does not have the Pauser role");
        _;
    }

    function isPauser(address account) public view returns (bool) {
        return _pausers.has(account);
    }

    function addPauser(address account) public onlyPauser {
        _addPauser(account);
    }

    function renouncePauser() public {
        _removePauser(_msgSender());
    }

    function _addPauser(address account) internal {
        _pausers.add(account);
        emit PauserAdded(account);
    }

    function _removePauser(address account) internal {
        _pausers.remove(account);
        emit PauserRemoved(account);
    }

    uint256[50] private ______gap;
}

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
contract Pausable is Initializable, Context, PauserRole {
    /**
     * @dev Emitted when the pause is triggered by a pauser (`account`).
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by a pauser (`account`).
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state. Assigns the Pauser role
     * to the deployer.
     */
    function initialize(address sender) public initializer {
        PauserRole.initialize(sender);

        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

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

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @dev Called by a pauser to pause, triggers stopped state.
     */
    function pause() public onlyPauser whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Called by a pauser to unpause, returns to normal state.
     */
    function unpause() public onlyPauser whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

    uint256[50] private ______gap;
}

/**
 * @title Pausable token
 * @dev ERC20 with pausable transfers and allowances.
 *
 * Useful if you want to stop trades until the end of a crowdsale, or have
 * an emergency switch for freezing all token transfers in the event of a large
 * bug.
 */
contract ERC20Pausable is Initializable, ERC20, Pausable {
    function initialize(address sender) public initializer {
        Pausable.initialize(sender);
    }

    function transfer(address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transfer(to, value);
    }

    function transferFrom(address from, address to, uint256 value) public whenNotPaused returns (bool) {
        return super.transferFrom(from, to, value);
    }

    function approve(address spender, uint256 value) public whenNotPaused returns (bool) {
        return super.approve(spender, value);
    }

    function increaseAllowance(address spender, uint256 addedValue) public whenNotPaused returns (bool) {
        return super.increaseAllowance(spender, addedValue);
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public whenNotPaused returns (bool) {
        return super.decreaseAllowance(spender, subtractedValue);
    }

    uint256[50] private ______gap;
}

/**
 * @title Continuous Offering abstract contract
 * @notice A shared base for various offerings from Fairmint.
 */
contract ContinuousOffering is ERC20Pausable, ERC20Capped, IERC20Detailed
{
  using SafeMath for uint;
  using Sqrt for uint;
  using SafeERC20 for IERC20;

  /**
   * Events
   */

  event Buy(
    address indexed _from,
    address indexed _to,
    uint _currencyValue,
    uint _fairValue
  );
  event Sell(
    address indexed _from,
    address indexed _to,
    uint _currencyValue,
    uint _fairValue
  );
  event Burn(
    address indexed _from,
    uint _fairValue
  );
  event StateChange(
    uint _previousState,
    uint _newState
  );

  /**
   * Constants
   */

  /// @notice The default state
  uint internal constant STATE_INIT = 0;

  /// @notice The state after initGoal has been reached
  uint internal constant STATE_RUN = 1;

  /// @notice The state after closed by the `beneficiary` account from STATE_RUN
  uint internal constant STATE_CLOSE = 2;

  /// @notice The state after closed by the `beneficiary` account from STATE_INIT
  uint internal constant STATE_CANCEL = 3;

  /// @notice When multiplying 2 terms, the max value is 2^128-1
  uint internal constant MAX_BEFORE_SQUARE = 2**128 - 1;

  /// @notice The denominator component for values specified in basis points.
  uint internal constant BASIS_POINTS_DEN = 10000;

  /// @notice The max `totalSupply() + burnedSupply`
  /// @dev This limit ensures that the DAT's formulas do not overflow (<MAX_BEFORE_SQUARE/2)
  uint internal constant MAX_SUPPLY = 10 ** 38;

  /**
   * Data specific to our token business logic
   */

  /// @notice The contract for transfer authorizations, if any.
  IWhitelist public whitelist;

  /// @notice The total number of burned FAIR tokens, excluding tokens burned from a `Sell` action in the DAT.
  uint public burnedSupply;

  /**
   * Data for DAT business logic
   */

  /// @dev unused slot which remains to ensure compatible upgrades
  bool private __autoBurn;

  /// @notice The address of the beneficiary organization which receives the investments.
  /// Points to the wallet of the organization.
  address payable public beneficiary;

  /// @notice The buy slope of the bonding curve.
  /// Does not affect the financial model, only the granularity of FAIR.
  /// @dev This is the numerator component of the fractional value.
  uint public buySlopeNum;

  /// @notice The buy slope of the bonding curve.
  /// Does not affect the financial model, only the granularity of FAIR.
  /// @dev This is the denominator component of the fractional value.
  uint public buySlopeDen;

  /// @notice The address from which the updatable variables can be updated
  address public control;

  /// @notice The address of the token used as reserve in the bonding curve
  /// (e.g. the DAI contract). Use ETH if 0.
  IERC20 public currency;

  /// @notice The address where fees are sent.
  address payable public feeCollector;

  /// @notice The percent fee collected each time new FAIR are issued expressed in basis points.
  uint public feeBasisPoints;

  /// @notice The initial fundraising goal (expressed in FAIR) to start the c-org.
  /// `0` means that there is no initial fundraising and the c-org immediately moves to run state.
  uint public initGoal;

  /// @notice A map with all investors in init state using address as a key and amount as value.
  /// @dev This structure's purpose is to make sure that only investors can withdraw their money if init_goal is not reached.
  mapping(address => uint) public initInvestors;

  /// @notice The initial number of FAIR created at initialization for the beneficiary.
  /// Technically however, this variable is not a constant as we must always have
  ///`init_reserve>=total_supply+burnt_supply` which means that `init_reserve` will be automatically
  /// decreased to equal `total_supply+burnt_supply` in case `init_reserve>total_supply+burnt_supply`
  /// after an investor sells his FAIRs.
  /// @dev Organizations may move these tokens into vesting contract(s)
  uint public initReserve;

  /// @notice The investment reserve of the c-org. Defines the percentage of the value invested that is
  /// automatically funneled and held into the buyback_reserve expressed in basis points.
  /// Internal since this is n/a to all derivative contracts.
  uint internal __investmentReserveBasisPoints;

  /// @dev unused slot which remains to ensure compatible upgrades
  uint private __openUntilAtLeast;

  /// @notice The minimum amount of `currency` investment accepted.
  uint public minInvestment;

  /// @dev The revenue commitment of the organization. Defines the percentage of the value paid through the contract
  /// that is automatically funneled and held into the buyback_reserve expressed in basis points.
  /// Internal since this is n/a to all derivative contracts.
  uint internal __revenueCommitmentBasisPoints;

  /// @notice The current state of the contract.
  /// @dev See the constants above for possible state values.
  uint public state;

  /// @dev If this value changes we need to reconstruct the DOMAIN_SEPARATOR
  string public constant version = "3";
  // --- EIP712 niceties ---
  // Original source: https://etherscan.io/address/0x6b175474e89094c44da98b954eedeac495271d0f#code
  mapping (address => uint) public nonces;
  bytes32 public DOMAIN_SEPARATOR;
  // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
  bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

  // The success fee (expressed in currency) that will be earned by setupFeeRecipient as soon as initGoal
  // is reached. We must have setup_fee <= buy_slope*init_goal^(2)/2
  uint public setupFee;

  // The recipient of the setup_fee once init_goal is reached
  address payable public setupFeeRecipient;

  /// @notice The minimum time before which the c-org contract cannot be closed once the contract has
  /// reached the `run` state.
  /// @dev When updated, the new value of `minimum_duration` cannot be earlier than the previous value.
  uint public minDuration;

  /// @dev Initialized at `0` and updated when the contract switches from `init` state to `run` state
  /// or when the initial trial period ends.
  uint public __startedOn;

  /// @notice The max possible value
  uint internal constant MAX_UINT = 2**256 - 1;

  // keccak256("PermitBuy(address from,address to,uint256 currencyValue,uint256 minTokensBought,uint256 nonce,uint256 deadline)");
  bytes32 public constant PERMIT_BUY_TYPEHASH = 0xaf42a244b3020d6a2253d9f291b4d3e82240da42b22129a8113a58aa7a3ddb6a;

  // keccak256("PermitSell(address from,address to,uint256 quantityToSell,uint256 minCurrencyReturned,uint256 nonce,uint256 deadline)");
  bytes32 public constant PERMIT_SELL_TYPEHASH = 0x5dfdc7fb4c68a4c249de5e08597626b84fbbe7bfef4ed3500f58003e722cc548;

  modifier authorizeTransfer(
    address _from,
    address _to,
    uint _value,
    bool _isSell
  )
  {
    if(address(whitelist) != address(0))
    {
      //automatically activate wallet _from
      //does not activate if,
      //1. _from is zero address,
      //2. it is burn
      if(!whitelist.walletActivated(_from) && _from != address(0) && !(_to == address(0) && !_isSell)){
        whitelist.activateWallet(_from);
      }
      //automatically activate wallet _to
      //does not activate if,
      //1. _to is zero address,
      if(!whitelist.walletActivated(_to) && _to != address(0)){
        whitelist.activateWallet(_to);
      }
      // This is not set for the minting of initialReserve
      whitelist.authorizeTransfer(_from, _to, _value, _isSell);
    }
    _;
    if(address(whitelist) != address(0)){
      //automatically deactivates _from if _from's balance is zero
      if(balanceOf(_from) == 0 && _from != address(0) && !(_to==address(0) && !_isSell)){
        //deactivate wallets without balance
        whitelist.deactivateWallet(_from);
      }
    }
  }

  /**
   * Buyback reserve
   */

  /// @notice The total amount of currency value currently locked in the contract and available to sellers.
  function buybackReserve() public view returns (uint)
  {
    uint reserve = address(this).balance;
    if(address(currency) != address(0))
    {
      reserve = currency.balanceOf(address(this));
    }

    if(reserve > MAX_BEFORE_SQUARE)
    {
      /// Math: If the reserve becomes excessive, cap the value to prevent overflowing in other formulas
      return MAX_BEFORE_SQUARE;
    }

    return reserve;
  }

  /**
   * Functions required by the ERC-20 token standard
   */

  /// @dev Moves tokens from one account to another if authorized.
  function _transfer(
    address _from,
    address _to,
    uint _amount
  ) internal
    authorizeTransfer(_from, _to, _amount, false)
  {
    require(state != STATE_INIT || _from == beneficiary, "ONLY_BENEFICIARY_DURING_INIT");
    super._transfer(_from, _to, _amount);
  }

  /// @dev Removes tokens from the circulating supply.
  function _burn(
    address _from,
    uint _amount,
    bool _isSell
  ) internal
    authorizeTransfer(_from, address(0), _amount, _isSell)
  {
    super._burn(_from, _amount);

    if(!_isSell)
    {
      // This is a burn
      require(state == STATE_RUN, "INVALID_STATE");
      // SafeMath not required as we cap how high this value may get during mint
      burnedSupply += _amount;
      emit Burn(_from, _amount);
    }
  }

  /// @notice Called to mint tokens on `buy`.
  function _mint(
    address _to,
    uint _quantity
  ) internal
    authorizeTransfer(address(0), _to, _quantity, false)
  {
    super._mint(_to, _quantity);

    // Math: If this value got too large, the DAT may overflow on sell
    require(totalSupply().add(burnedSupply) <= MAX_SUPPLY, "EXCESSIVE_SUPPLY");
  }

  /**
   * Transaction Helpers
   */

  /// @notice Confirms the transfer of `_quantityToInvest` currency to the contract.
  function _collectInvestment(
    address payable _from,
    uint _quantityToInvest,
    uint _msgValue,
    bool _refundRemainder
  ) internal
  {
    if(address(currency) == address(0))
    {
      // currency is ETH
      if(_refundRemainder)
      {
        // Math: if _msgValue was not sufficient then revert
        uint refund = _msgValue.sub(_quantityToInvest);
        if(refund > 0)
        {
          Address.sendValue(msg.sender, refund);
        }
      }
      else
      {
        require(_quantityToInvest == _msgValue, "INCORRECT_MSG_VALUE");
      }
    }
    else
    {
      // currency is ERC20
      require(_msgValue == 0, "DO_NOT_SEND_ETH");

      currency.safeTransferFrom(_from, address(this), _quantityToInvest);
    }
  }

  /// @dev Send `_amount` currency from the contract to the `_to` account.
  function _transferCurrency(
    address payable _to,
    uint _amount
  ) internal
  {
    if(_amount > 0)
    {
      if(address(currency) == address(0))
      {
        Address.sendValue(_to, _amount);
      }
      else
      {
        currency.safeTransfer(_to, _amount);
      }
    }
  }

  /**
   * Config / Control
   */

  /// @notice Called once after deploy to set the initial configuration.
  /// None of the values provided here may change once initially set.
  /// @dev using the init pattern in order to support zos upgrades
  function _initialize(
    uint _initReserve,
    address _currencyAddress,
    uint _initGoal,
    uint _buySlopeNum,
    uint _buySlopeDen,
    uint _setupFee,
    address payable _setupFeeRecipient
  ) internal
  {
    // The ERC-20 implementation will confirm initialize is only run once
    ERC20Capped.initialize((5000000 * (10 ** 18)), msg.sender);
    // Also update the pausable setting
    _addPauser(msg.sender);

    require(_buySlopeNum > 0, "INVALID_SLOPE_NUM");
    require(_buySlopeDen > 0, "INVALID_SLOPE_DEN");
    require(_buySlopeNum < MAX_BEFORE_SQUARE, "EXCESSIVE_SLOPE_NUM");
    require(_buySlopeDen < MAX_BEFORE_SQUARE, "EXCESSIVE_SLOPE_DEN");
    buySlopeNum = _buySlopeNum;
    buySlopeDen = _buySlopeDen;

    // Setup Fee
    require(_setupFee == 0 || _setupFeeRecipient != address(0), "MISSING_SETUP_FEE_RECIPIENT");
    require(_setupFeeRecipient == address(0) || _setupFee != 0, "MISSING_SETUP_FEE");
    // setup_fee <= (n/d)*(g^2)/2
    uint initGoalInCurrency = _initGoal * _initGoal;
    initGoalInCurrency = initGoalInCurrency.mul(_buySlopeNum);
    initGoalInCurrency /= 2 * _buySlopeDen;
    require(_setupFee <= initGoalInCurrency, "EXCESSIVE_SETUP_FEE");
    setupFee = _setupFee;
    setupFeeRecipient = _setupFeeRecipient;

    // Set default values (which may be updated using `updateConfig`)
    uint decimals = 18;
    if(_currencyAddress != address(0))
    {
      decimals = IERC20Detailed(_currencyAddress).decimals();
    }
    minInvestment = 100 * (10 ** decimals);
    beneficiary = msg.sender;
    control = msg.sender;
    feeCollector = msg.sender;

    // Save currency
    currency = IERC20(_currencyAddress);

    // Mint the initial reserve
    if(_initReserve > 0)
    {
      initReserve = _initReserve;
      _mint(beneficiary, initReserve);
    }

    initializeDomainSeparator();
  }

  /// @notice Used to initialize the domain separator used in meta-transactions
  /// @dev This is separate from `initialize` to allow upgraded contracts to update the version
  /// There is no harm in calling this multiple times / no permissions required
  function initializeDomainSeparator() public
  {
    uint id;
    // solium-disable-next-line
    assembly
    {
      id := chainid()
    }
    DOMAIN_SEPARATOR = keccak256(
      abi.encode(
        keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
        keccak256(bytes(name())),
        keccak256(bytes(version)),
        id,
        address(this)
      )
    );
  }

  function _updateConfig(
    address _whitelistAddress,
    address payable _beneficiary,
    address _control,
    address payable _feeCollector,
    uint _feeBasisPoints,
    uint _minInvestment,
    uint _minDuration
  ) internal
  {
    // This require(also confirms that initialize has been called.
    require(msg.sender == control, "CONTROL_ONLY");

    // address(0) is okay
    whitelist = IWhitelist(_whitelistAddress);

    require(_control != address(0), "INVALID_ADDRESS");
    control = _control;

    require(_feeCollector != address(0), "INVALID_ADDRESS");
    feeCollector = _feeCollector;

    require(_feeBasisPoints <= BASIS_POINTS_DEN, "INVALID_FEE");
    feeBasisPoints = _feeBasisPoints;

    require(_minInvestment > 0, "INVALID_MIN_INVESTMENT");
    minInvestment = _minInvestment;

    require(_minDuration >= minDuration, "MIN_DURATION_MAY_NOT_BE_REDUCED");
    minDuration = _minDuration;

    if(beneficiary != _beneficiary)
    {
      require(_beneficiary != address(0), "INVALID_ADDRESS");
      uint tokens = balanceOf(beneficiary);
      initInvestors[_beneficiary] = initInvestors[_beneficiary].add(initInvestors[beneficiary]);
      initInvestors[beneficiary] = 0;
      if(tokens > 0)
      {
        _transfer(beneficiary, _beneficiary, tokens);
      }
      beneficiary = _beneficiary;
    }
  }

  /**
   * Functions for our business logic
   */

  /// @notice Burn the amount of tokens from the address msg.sender if authorized.
  /// @dev Note that this is not the same as a `sell` via the DAT.
  function burn(
    uint _amount
  ) public
  {
    _burn(msg.sender, _amount, false);
  }

  /// @notice Burn the amount of tokens from the given address if approved.
  function burnFrom(
    address _from,
    uint _amount
  ) public
  {
    _approve(_from, msg.sender, allowance(_from, msg.sender).sub(_amount, "ERC20: burn amount exceeds allowance"));
    _burn(_from, _amount, false);
  }

  // Buy

  /// @dev Distributes _value currency between the buybackReserve, beneficiary, and feeCollector.
  function _distributeInvestment(uint _value) internal;

  /// @notice Calculate how many FAIR tokens you would buy with the given amount of currency if `buy` was called now.
  /// @param _currencyValue How much currency to spend in order to buy FAIR.
  function estimateBuyValue(
    uint _currencyValue
  ) public view
    returns (uint)
  {
    if(_currencyValue < minInvestment)
    {
      return 0;
    }

    /// Calculate the tokenValue for this investment
    uint tokenValue;
    if(state == STATE_INIT)
    {
      uint currencyValue = _currencyValue;
      uint _totalSupply = totalSupply();
      // (buy_slope*init_goal)*(init_goal+init_reserve-total_supply)
      // n/d: buy_slope (MAX_BEFORE_SQUARE / MAX_BEFORE_SQUARE)
      // g: init_goal (MAX_BEFORE_SQUARE)
      // t: total_supply (MAX_BEFORE_SQUARE)
      // r: init_reserve (MAX_BEFORE_SQUARE)
      // source: ((n/d)*g)*(g+r-t)
      // impl: (g n (g + r - t))/(d)
      uint max = BigDiv.bigDiv2x1(
        initGoal * buySlopeNum,
        initGoal + initReserve - _totalSupply,
        buySlopeDen
      );
      if(currencyValue > max)
      {
        currencyValue = max;
      }
      // Math: worst case
      // MAX * MAX_BEFORE_SQUARE
      // / MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE
      tokenValue = BigDiv.bigDiv2x1(
        currencyValue,
        buySlopeDen,
        initGoal * buySlopeNum
      );

      if(currencyValue != _currencyValue)
      {
        currencyValue = _currencyValue - max;
        // ((2*next_amount/buy_slope)+init_goal^2)^(1/2)-init_goal
        // a: next_amount | currencyValue
        // n/d: buy_slope (MAX_BEFORE_SQUARE / MAX_BEFORE_SQUARE)
        // g: init_goal (MAX_BEFORE_SQUARE/2)
        // r: init_reserve (MAX_BEFORE_SQUARE/2)
        // sqrt(((2*a/(n/d))+g^2)-g
        // sqrt((2 d a + n g^2)/n) - g

        // currencyValue == 2 d a
        uint temp = 2 * buySlopeDen;
        currencyValue = temp.mul(currencyValue);

        // temp == g^2
        temp = initGoal;
        temp *= temp;

        // temp == n g^2
        temp = temp.mul(buySlopeNum);

        // temp == (2 d a) + n g^2
        temp = currencyValue.add(temp);

        // temp == (2 d a + n g^2)/n
        temp /= buySlopeNum;

        // temp == sqrt((2 d a + n g^2)/n)
        temp = temp.sqrt();

        // temp == sqrt((2 d a + n g^2)/n) - g
        temp -= initGoal;

        tokenValue = tokenValue.add(temp);
      }
    }
    else if(state == STATE_RUN)
    {
      // initReserve is reduced on sell as necessary to ensure that this line will not overflow
      uint supply = totalSupply() + burnedSupply - initReserve;
      // Math: worst case
      // MAX * 2 * MAX_BEFORE_SQUARE
      // / MAX_BEFORE_SQUARE
      tokenValue = BigDiv.bigDiv2x1(
        _currencyValue,
        2 * buySlopeDen,
        buySlopeNum
      );

      // Math: worst case MAX + (MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE)
      tokenValue = tokenValue.add(supply * supply);
      tokenValue = tokenValue.sqrt();

      // Math: small chance of underflow due to possible rounding in sqrt
      tokenValue = tokenValue.sub(supply);
    }
    else
    {
      // invalid state
      return 0;
    }

    return tokenValue;
  }

  function _buy(
    address payable _from,
    address _to,
    uint _currencyValue,
    uint _minTokensBought
  ) internal
  {
    require(_to != address(0), "INVALID_ADDRESS");
    require(_minTokensBought > 0, "MUST_BUY_AT_LEAST_1");

    // Calculate the tokenValue for this investment
    uint tokenValue = estimateBuyValue(_currencyValue);
    require(tokenValue >= _minTokensBought, "PRICE_SLIPPAGE");

    emit Buy(_from, _to, _currencyValue, tokenValue);

    _collectInvestment(_from, _currencyValue, msg.value, false);

    // Update state, initInvestors, and distribute the investment when appropriate
    if(state == STATE_INIT)
    {
      // Math worst case: MAX_BEFORE_SQUARE
      initInvestors[_to] += tokenValue;
      // Math worst case:
      // MAX_BEFORE_SQUARE + MAX_BEFORE_SQUARE
      if(totalSupply() + tokenValue - initReserve >= initGoal)
      {
        emit StateChange(state, STATE_RUN);
        state = STATE_RUN;
        if(__startedOn == 0) {
          __startedOn = block.timestamp;
        }

        // Math worst case:
        // MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE/2
        // / MAX_BEFORE_SQUARE
        uint beneficiaryContribution = BigDiv.bigDiv2x1(
          initInvestors[beneficiary],
          buySlopeNum * initGoal,
          buySlopeDen
        );

        if(setupFee > 0)
        {
          _transferCurrency(setupFeeRecipient, setupFee);
          if(beneficiaryContribution > setupFee)
          {
            beneficiaryContribution -= setupFee;
          }
          else
          {
            beneficiaryContribution = 0;
          }
        }

        _distributeInvestment(buybackReserve().sub(beneficiaryContribution));
      }
    }
    else // implied: if(state == STATE_RUN)
    {
      if(_to != beneficiary)
      {
        _distributeInvestment(_currencyValue);
      }
    }

    _mint(_to, tokenValue);
  }

  /// @notice Purchase FAIR tokens with the given amount of currency.
  /// @param _to The account to receive the FAIR tokens from this purchase.
  /// @param _currencyValue How much currency to spend in order to buy FAIR.
  /// @param _minTokensBought Buy at least this many FAIR tokens or the transaction reverts.
  /// @dev _minTokensBought is necessary as the price will change if some elses transaction mines after
  /// yours was submitted.
  function buy(
    address _to,
    uint _currencyValue,
    uint _minTokensBought
  ) public payable
  {
    _buy(msg.sender, _to, _currencyValue, _minTokensBought);
  }

  /// @notice Allow users to sign a message authorizing a buy
  function permitBuy(
    address payable _from,
    address _to,
    uint _currencyValue,
    uint _minTokensBought,
    uint _deadline,
    uint8 _v,
    bytes32 _r,
    bytes32 _s
  ) external
  {
    require(_deadline >= block.timestamp, "EXPIRED");
    bytes32 digest = keccak256(abi.encode(PERMIT_BUY_TYPEHASH, _from, _to, _currencyValue, _minTokensBought, nonces[_from]++, _deadline));
    digest = keccak256(
      abi.encodePacked(
        "\x19\x01",
        DOMAIN_SEPARATOR,
        digest
      )
    );
    address recoveredAddress = ecrecover(digest, _v, _r, _s);
    require(recoveredAddress != address(0) && recoveredAddress == _from, "INVALID_SIGNATURE");
    _buy(_from, _to, _currencyValue, _minTokensBought);
  }

  /// Sell

  function estimateSellValue(
    uint _quantityToSell
  ) public view
    returns(uint)
  {
    uint reserve = buybackReserve();

    // Calculate currencyValue for this sale
    uint currencyValue;
    if(state == STATE_RUN)
    {
      uint supply = totalSupply() + burnedSupply;

      // buyback_reserve = r
      // total_supply = t
      // burnt_supply = b
      // amount = a
      // source: (t+b)*a*(2*r)/((t+b)^2)-(((2*r)/((t+b)^2)*a^2)/2)+((2*r)/((t+b)^2)*a*b^2)/(2*(t))
      // imp: (a b^2 r)/(t (b + t)^2) + (2 a r)/(b + t) - (a^2 r)/(b + t)^2

      // Math: burnedSupply is capped in FAIR such that the square will never overflow
      // Math worst case:
      // MAX * MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE/2 * MAX_BEFORE_SQUARE/2
      // / MAX_BEFORE_SQUARE/2 * MAX_BEFORE_SQUARE/2 * MAX_BEFORE_SQUARE/2
      currencyValue = BigDiv.bigDiv2x2(
        _quantityToSell.mul(reserve),
        burnedSupply * burnedSupply,
        totalSupply(), supply * supply
      );
      // Math: worst case currencyValue is MAX_BEFORE_SQUARE (max reserve, 1 supply)

      // Math worst case:
      // MAX * 2 * MAX_BEFORE_SQUARE
      uint temp = _quantityToSell.mul(2 * reserve);
      temp /= supply;
      // Math: worst-case temp is MAX_BEFORE_SQUARE (max reserve, 1 supply)

      // Math: considering the worst-case for currencyValue and temp, this can never overflow
      currencyValue += temp;

      // Math: worst case
      // MAX * MAX * MAX_BEFORE_SQUARE
      // / MAX_BEFORE_SQUARE/2 * MAX_BEFORE_SQUARE/2
      temp = BigDiv.bigDiv2x1RoundUp(
        _quantityToSell.mul(_quantityToSell),
        reserve,
        supply * supply
      );
      if(currencyValue > temp)
      {
        currencyValue -= temp;
      }
      else
      {
        currencyValue = 0;
      }
    }
    else if(state == STATE_CLOSE)
    {
      // Math worst case
      // MAX * MAX_BEFORE_SQUARE
      currencyValue = _quantityToSell.mul(reserve);
      currencyValue /= totalSupply();
    }
    else
    {
      // STATE_INIT or STATE_CANCEL
      // Math worst case:
      // MAX * MAX_BEFORE_SQUARE
      currencyValue = _quantityToSell.mul(reserve);
      // Math: FAIR blocks initReserve from being burned unless we reach the RUN state which prevents an underflow
      currencyValue /= totalSupply() - initReserve;
    }

    return currencyValue;
  }

  function _sell(
    address _from,
    address payable _to,
    uint _quantityToSell,
    uint _minCurrencyReturned
  ) internal
  {
    require(_from != beneficiary || state >= STATE_CLOSE, "BENEFICIARY_ONLY_SELL_IN_CLOSE_OR_CANCEL");
    require(_minCurrencyReturned > 0, "MUST_SELL_AT_LEAST_1");

    uint currencyValue = estimateSellValue(_quantityToSell);
    require(currencyValue >= _minCurrencyReturned, "PRICE_SLIPPAGE");

    if(state == STATE_INIT || state == STATE_CANCEL)
    {
      initInvestors[_from] = initInvestors[_from].sub(_quantityToSell);
    }

    _burn(_from, _quantityToSell, true);
    uint supply = totalSupply() + burnedSupply;
    if(supply < initReserve)
    {
      initReserve = supply;
    }

    _transferCurrency(_to, currencyValue);
    emit Sell(_from, _to, currencyValue, _quantityToSell);
  }

  /// @notice Sell FAIR tokens for at least the given amount of currency.
  /// @param _to The account to receive the currency from this sale.
  /// @param _quantityToSell How many FAIR tokens to sell for currency value.
  /// @param _minCurrencyReturned Get at least this many currency tokens or the transaction reverts.
  /// @dev _minCurrencyReturned is necessary as the price will change if some elses transaction mines after
  /// yours was submitted.
  function sell(
    address payable _to,
    uint _quantityToSell,
    uint _minCurrencyReturned
  ) public
  {
    _sell(msg.sender, _to, _quantityToSell, _minCurrencyReturned);
  }

  /// @notice Allow users to sign a message authorizing a sell
  function permitSell(
    address _from,
    address payable _to,
    uint _quantityToSell,
    uint _minCurrencyReturned,
    uint _deadline,
    uint8 _v,
    bytes32 _r,
    bytes32 _s
  ) external
  {
    require(_deadline >= block.timestamp, "EXPIRED");
    bytes32 digest = keccak256(abi.encode(PERMIT_SELL_TYPEHASH, _from, _to, _quantityToSell, _minCurrencyReturned, nonces[_from]++, _deadline));
    digest = keccak256(
      abi.encodePacked(
        "\x19\x01",
        DOMAIN_SEPARATOR,
        digest
      )
    );
    address recoveredAddress = ecrecover(digest, _v, _r, _s);
    require(recoveredAddress != address(0) && recoveredAddress == _from, "INVALID_SIGNATURE");
    _sell(_from, _to, _quantityToSell, _minCurrencyReturned);
  }

  /// Close

  /// @notice Called by the beneficiary account to STATE_CLOSE or STATE_CANCEL the c-org,
  /// preventing any more tokens from being minted.
  /// @dev Requires an `exitFee` to be paid.  If the currency is ETH, include a little more than
  /// what appears to be required and any remainder will be returned to your account.  This is
  /// because another user may have a transaction mined which changes the exitFee required.
  /// For other `currency` types, the beneficiary account will be billed the exact amount required.
  function _close() internal
  {
    require(msg.sender == beneficiary, "BENEFICIARY_ONLY");

    if(state == STATE_INIT)
    {
      // Allow the org to cancel anytime if the initGoal was not reached.
      emit StateChange(state, STATE_CANCEL);
      state = STATE_CANCEL;
    }
    else if(state == STATE_RUN)
    {
      // Collect the exitFee and close the c-org.
      require(MAX_UINT - minDuration > __startedOn, "MAY_NOT_CLOSE");
      require(minDuration + __startedOn <= block.timestamp, "TOO_EARLY");

      emit StateChange(state, STATE_CLOSE);
      state = STATE_CLOSE;
    }
    else
    {
      revert("INVALID_STATE");
    }
  }

  // --- Approve by signature ---
  // EIP-2612
  // Original source: https://github.com/Uniswap/uniswap-v2-core/blob/master/contracts/UniswapV2ERC20.sol
  function permit(
    address owner,
    address spender,
    uint value,
    uint deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external
  {
    require(deadline >= block.timestamp, "EXPIRED");
    bytes32 digest = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline));
    digest = keccak256(
      abi.encodePacked(
        "\x19\x01",
        DOMAIN_SEPARATOR,
        digest
      )
    );
    address recoveredAddress = ecrecover(digest, v, r, s);
    require(recoveredAddress != address(0) && recoveredAddress == owner, "INVALID_SIGNATURE");
    _approve(owner, spender, value);
  }

  /**
* @dev Returns the name of the token.
*/
  function name() public view returns (string memory) {
    return "Vision Token";
  }

  /**
   * @dev Returns the symbol of the token, usually a shorter version of the
   * name.
   */
  function symbol() public view returns (string memory) {
    return "VISION";
  }

  /**
   * @dev Returns the number of decimals used to get its user representation.
   * For example, if `decimals` equals `2`, a balance of `505` tokens should
   * be displayed to a user as `5,05` (`505 / 10 ** 2`).
   *
   * Tokens usually opt for a value of 18, imitating the relationship between
   * Ether and Wei.
   *
   * NOTE: This information is only used for _display_ purposes: it in
   * no way affects any of the arithmetic of the contract, including
   * {IERC20-balanceOf} and {IERC20-transfer}.
   */
  function decimals() public view returns (uint8) {
    return 18;
  }

  uint256[50] private __gap;
}

/**
 * @title Decentralized Autonomous Trust
 * This contract is the reference implementation provided by Fairmint for a
 * Decentralized Autonomous Trust as described in the continuous
 * organization whitepaper (https://github.com/c-org/whitepaper) and
 * specified here: https://github.com/fairmint/c-org/wiki. Use at your own
 * risk. If you have question or if you're looking for a ready-to-use
 * solution using this contract, you might be interested in Fairmint's
 * offering. Do not hesitate to get in touch with us: https://fairmint.co
 */
contract VisionToken is ContinuousOffering {
  event Close(uint _exitFee);
  event Pay(address indexed _from, uint _currencyValue);
  event UpdateConfig(
    address _whitelistAddress,
    address indexed _beneficiary,
    address indexed _control,
    address indexed _feeCollector,
    uint _revenueCommitmentBasisPoints,
    uint _feeBasisPoints,
    uint _minInvestment,
    uint _minDuration
  );

  /// @notice The revenue commitment of the organization. Defines the percentage of the value paid through the contract
  /// that is automatically funneled and held into the buyback_reserve expressed in basis points.
  /// Internal since this is n/a to all derivative contracts.
  function revenueCommitmentBasisPoints() public view returns (uint) {
    return __revenueCommitmentBasisPoints;
  }

  /// @notice The investment reserve of the c-org. Defines the percentage of the value invested that is
  /// automatically funneled and held into the buyback_reserve expressed in basis points.
  /// Internal since this is n/a to all derivative contracts.
  function investmentReserveBasisPoints() public view returns (uint) {
    return __investmentReserveBasisPoints;
  }

  /// @notice Initialized at `0` and updated when the contract switches from `init` state to `run` state
  /// with the current timestamp.
  function runStartedOn() public view returns (uint) {
    return __startedOn;
  }

  function initialize(
    uint _initReserve,
    address _currencyAddress,
    uint _initGoal,
    uint _buySlopeNum,
    uint _buySlopeDen,
    uint _investmentReserveBasisPoints,
    uint _setupFee,
    address payable _setupFeeRecipient
  ) public
  {
    // _initialize will enforce this is only called once
    super._initialize(
      _initReserve,
      _currencyAddress,
      _initGoal,
      _buySlopeNum,
      _buySlopeDen,
      _setupFee,
      _setupFeeRecipient
    );

    // Set initGoal, which in turn defines the initial state
    if(_initGoal == 0)
    {
      emit StateChange(state, STATE_RUN);
      state = STATE_RUN;
      __startedOn = block.timestamp;
    }
    else
    {
      // Math: If this value got too large, the DAT would overflow on sell
      require(_initGoal < MAX_SUPPLY, "EXCESSIVE_GOAL");
      initGoal = _initGoal;
    }

    // 100% or less
    require(_investmentReserveBasisPoints <= BASIS_POINTS_DEN, "INVALID_RESERVE");
    __investmentReserveBasisPoints = _investmentReserveBasisPoints;
  }



  /// Close


  function estimateExitFee(uint _msgValue) public view returns (uint) {
    uint exitFee;

    if (state == STATE_RUN) {
      uint reserve = buybackReserve();
      reserve = reserve.sub(_msgValue);

      // Source: t*(t+b)*(n/d)-r
      // Implementation: (b n t)/d + (n t^2)/d - r

      uint _totalSupply = totalSupply();

      // Math worst case:
      // MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE/2 * MAX_BEFORE_SQUARE
      exitFee = BigDiv.bigDiv2x1(
        _totalSupply,
        burnedSupply * buySlopeNum,
        buySlopeDen
      );
      // Math worst case:
      // MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE * MAX_BEFORE_SQUARE
      exitFee += BigDiv.bigDiv2x1(
        _totalSupply,
        buySlopeNum * _totalSupply,
        buySlopeDen
      );
      // Math: this if condition avoids a potential overflow
      if (exitFee <= reserve) {
        exitFee = 0;
      } else {
        exitFee -= reserve;
      }
    }

    return exitFee;
  }

  /// @notice Called by the beneficiary account to STATE_CLOSE or STATE_CANCEL the c-org,
  /// preventing any more tokens from being minted.
  /// @dev Requires an `exitFee` to be paid.  If the currency is ETH, include a little more than
  /// what appears to be required and any remainder will be returned to your account.  This is
  /// because another user may have a transaction mined which changes the exitFee required.
  /// For other `currency` types, the beneficiary account will be billed the exact amount required.
  function close() public payable {
    uint exitFee = 0;

    if (state == STATE_RUN) {
      exitFee = estimateExitFee(msg.value);
      _collectInvestment(msg.sender, exitFee, msg.value, true);
    }

    super._close();
    emit Close(exitFee);
  }

  /// Pay

  /// @dev Pay the organization on-chain.
  /// @param _currencyValue How much currency which was paid.
  function pay(uint _currencyValue) public payable {
    _collectInvestment(msg.sender, _currencyValue, msg.value, false);
    require(state == STATE_RUN, "INVALID_STATE");
    require(_currencyValue > 0, "MISSING_CURRENCY");

    // Send a portion of the funds to the beneficiary, the rest is added to the buybackReserve
    // Math: if _currencyValue is < (2^256 - 1) / 10000 this will not overflow
    uint reserve = _currencyValue.mul(__revenueCommitmentBasisPoints);
    reserve /= BASIS_POINTS_DEN;

    // Math: this will never underflow since revenueCommitmentBasisPoints is capped to BASIS_POINTS_DEN
    _transferCurrency(beneficiary, _currencyValue - reserve);

    emit Pay(msg.sender, _currencyValue);
  }

  /// @notice Pay the organization on-chain without minting any tokens.
  /// @dev This allows you to add funds directly to the buybackReserve.
  function() external payable {
    require(address(currency) == address(0), "ONLY_FOR_CURRENCY_ETH");
  }

  function updateConfig(
    address _whitelistAddress,
    address payable _beneficiary,
    address _control,
    address payable _feeCollector,
    uint _feeBasisPoints,
    uint _revenueCommitmentBasisPoints,
    uint _minInvestment,
    uint _minDuration
  ) public {
    _updateConfig(
      _whitelistAddress,
      _beneficiary,
      _control,
      _feeCollector,
      _feeBasisPoints,
      _minInvestment,
      _minDuration
    );

    require(
      _revenueCommitmentBasisPoints <= BASIS_POINTS_DEN,
      "INVALID_COMMITMENT"
    );
    require(
      _revenueCommitmentBasisPoints >= __revenueCommitmentBasisPoints,
      "COMMITMENT_MAY_NOT_BE_REDUCED"
    );
    __revenueCommitmentBasisPoints = _revenueCommitmentBasisPoints;

    emit UpdateConfig(
      _whitelistAddress,
      _beneficiary,
      _control,
      _feeCollector,
      _revenueCommitmentBasisPoints,
      _feeBasisPoints,
      _minInvestment,
      _minDuration
    );
  }

  /// @notice A temporary function to set `runStartedOn`, to be used by contracts which were
  /// already deployed before this feature was introduced.
  /// @dev This function will be removed once known users have called the function.
  function initializeRunStartedOn(
    uint _runStartedOn
  ) external
  {
    require(msg.sender == control, "CONTROL_ONLY");
    require(state == STATE_RUN, "ONLY_CALL_IN_RUN");
    require(__startedOn == 0, "ONLY_CALL_IF_NOT_AUTO_SET");
    require(_runStartedOn <= block.timestamp, "DATE_MUST_BE_IN_PAST");

    __startedOn = _runStartedOn;
  }

  /// @dev Distributes _value currency between the buybackReserve, beneficiary, and feeCollector.
  function _distributeInvestment(
    uint _value
  ) internal
  {
    // Rounding favors buybackReserve, then beneficiary, and feeCollector is last priority.

    // Math: if investment value is < (2^256 - 1) / 10000 this will never overflow.
    // Except maybe with a huge single investment, but they can try again with multiple smaller investments.
    uint reserve = __investmentReserveBasisPoints.mul(_value);
    reserve /= BASIS_POINTS_DEN;
    reserve = _value.sub(reserve);
    uint fee = reserve.mul(feeBasisPoints);
    fee /= BASIS_POINTS_DEN;

    // Math: since feeBasisPoints is <= BASIS_POINTS_DEN, this will never underflow.
    _transferCurrency(beneficiary, reserve - fee);
    _transferCurrency(feeCollector, fee);
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

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payable","name":"_to","type":"address"},{"internalType":"uint256","name":"_quantityToSell","type":"uint256"},{"internalType":"uint256","name":"_minCurrencyReturned","type":"uint256"}],"name":"sell","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"setupFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"setupFeeRecipient","outputs":[{"internalType":"address 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payable","name":"_beneficiary","type":"address"},{"internalType":"address","name":"_control","type":"address"},{"internalType":"address payable","name":"_feeCollector","type":"address"},{"internalType":"uint256","name":"_feeBasisPoints","type":"uint256"},{"internalType":"uint256","name":"_revenueCommitmentBasisPoints","type":"uint256"},{"internalType":"uint256","name":"_minInvestment","type":"uint256"},{"internalType":"uint256","name":"_minDuration","type":"uint256"}],"name":"updateConfig","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"whitelist","outputs":[{"internalType":"contract IWhitelist","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"}]

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