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ERC-20
DeFi
CoinMarketCap
CoinGecko
Add Token to MetaMask (Web3)Overview
Max Total Supply
1,784,075.604273303587294425 VISION
Holders
1,325 (0.00%)
Market
Price
$0.19 @ 0.000073 ETH
Onchain Market Cap
$344,278.15
Circulating Supply Market Cap
$0.00
Other Info
Token Contract (WITH 18 Decimals)
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| # | Exchange | Pair | Price | 24H Volume | % Volume |
|---|
Contract Name:
VisionToken
Compiler Version
v0.5.17+commit.d19bba13
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*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);
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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