Feature Tip: Add private address tag to any address under My Name Tag !
ERC-20
Overview
Max Total Supply
6,000,000 ULLU
Holders
206
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
2,504.140151087612114957 ULLUValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
ulluToken
Compiler Version
v0.5.16+commit.9c3226ce
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2020-04-15 */ // File: openzeppelin-solidity/contracts/math/SafeMath.sol pragma solidity >=0.4.21 <0.7.0; /** * @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; } } // File: openzeppelin-solidity/contracts/GSN/Context.sol /* * @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 { // 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; } } // File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol /** * @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); } // File: openzeppelin-solidity/contracts/utils/Address.sol /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * This test is non-exhaustive, and there may be false-negatives: during the * execution of a contract's constructor, its address will be reported as * not containing 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. */ function isContract(address account) internal view returns (bool) { // This method relies in extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. // 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 != 0x0 && codehash != accountHash); } /** * @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"); } } // File: openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol /** * @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"); } } } // File: openzeppelin-solidity/contracts/utils/ReentrancyGuard.sol /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. */ contract ReentrancyGuard { // counter to allow mutex lock with only one SSTORE operation uint256 private _guardCounter; constructor () internal { // The counter starts at one to prevent changing it from zero to a non-zero // value, which is a more expensive operation. _guardCounter = 1; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and make it call a * `private` function that does the actual work. */ modifier nonReentrant() { _guardCounter += 1; uint256 localCounter = _guardCounter; _; require(localCounter == _guardCounter, "ReentrancyGuard: reentrant call"); } } // File: openzeppelin-solidity/contracts/crowdsale/Crowdsale.sol /** * @title Crowdsale * @dev Crowdsale is a base contract for managing a token crowdsale, * allowing investors to purchase tokens with ether. This contract implements * such functionality in its most fundamental form and can be extended to provide additional * functionality and/or custom behavior. * The external interface represents the basic interface for purchasing tokens, and conforms * the base architecture for crowdsales. It is *not* intended to be modified / overridden. * The internal interface conforms the extensible and modifiable surface of crowdsales. Override * the methods to add functionality. Consider using 'super' where appropriate to concatenate * behavior. */ contract Crowdsale is Context, ReentrancyGuard { using SafeMath for uint256; using SafeERC20 for IERC20; // The token being sold IERC20 private _token; // Address where funds are collected address payable private _wallet; // How many token units a buyer gets per wei. // The rate is the conversion between wei and the smallest and indivisible token unit. // So, if you are using a rate of 1 with a ERC20Detailed token with 3 decimals called TOK // 1 wei will give you 1 unit, or 0.001 TOK. uint256 private _rate; // Amount of wei raised uint256 private _weiRaised; /** * Event for token purchase logging * @param purchaser who paid for the tokens * @param beneficiary who got the tokens * @param value weis paid for purchase * @param amount amount of tokens purchased */ event TokensPurchased(address indexed purchaser, address indexed beneficiary, uint256 value, uint256 amount); /** * @param rate Number of token units a buyer gets per wei * @dev The rate is the conversion between wei and the smallest and indivisible * token unit. So, if you are using a rate of 1 with a ERC20Detailed token * with 3 decimals called TOK, 1 wei will give you 1 unit, or 0.001 TOK. * @param wallet Address where collected funds will be forwarded to * @param token Address of the token being sold */ constructor (uint256 rate, address payable wallet, IERC20 token) public { require(rate > 0, "Crowdsale: rate is 0"); require(wallet != address(0), "Crowdsale: wallet is the zero address"); require(address(token) != address(0), "Crowdsale: token is the zero address"); _rate = rate; _wallet = wallet; _token = token; } /** * @dev fallback function ***DO NOT OVERRIDE*** * Note that other contracts will transfer funds with a base gas stipend * of 2300, which is not enough to call buyTokens. Consider calling * buyTokens directly when purchasing tokens from a contract. */ function () external payable { buyTokens(_msgSender()); } /** * @return the token being sold. */ function token() public view returns (IERC20) { return _token; } /** * @return the address where funds are collected. */ function wallet() public view returns (address payable) { return _wallet; } /** * @return the number of token units a buyer gets per wei. */ function rate() public view returns (uint256) { return _rate; } /** * @return the amount of wei raised. */ function weiRaised() public view returns (uint256) { return _weiRaised; } /** * @dev low level token purchase ***DO NOT OVERRIDE*** * This function has a non-reentrancy guard, so it shouldn't be called by * another `nonReentrant` function. * @param beneficiary Recipient of the token purchase */ function buyTokens(address beneficiary) public nonReentrant payable { uint256 weiAmount = msg.value; _preValidatePurchase(beneficiary, weiAmount); // calculate token amount to be created uint256 tokens = _getTokenAmount(weiAmount); // update state _weiRaised = _weiRaised.add(weiAmount); _processPurchase(beneficiary, tokens); emit TokensPurchased(_msgSender(), beneficiary, weiAmount, tokens); _updatePurchasingState(beneficiary, weiAmount); _forwardFunds(); _postValidatePurchase(beneficiary, weiAmount); } /** * @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met. * Use `super` in contracts that inherit from Crowdsale to extend their validations. * Example from CappedCrowdsale.sol's _preValidatePurchase method: * super._preValidatePurchase(beneficiary, weiAmount); * require(weiRaised().add(weiAmount) <= cap); * @param beneficiary Address performing the token purchase * @param weiAmount Value in wei involved in the purchase */ function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal view { require(beneficiary != address(0), "Crowdsale: beneficiary is the zero address"); require(weiAmount != 0, "Crowdsale: weiAmount is 0"); this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 } /** * @dev Validation of an executed purchase. Observe state and use revert statements to undo rollback when valid * conditions are not met. * @param beneficiary Address performing the token purchase * @param weiAmount Value in wei involved in the purchase */ function _postValidatePurchase(address beneficiary, uint256 weiAmount) internal view { // solhint-disable-previous-line no-empty-blocks } /** * @dev Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends * its tokens. * @param beneficiary Address performing the token purchase * @param tokenAmount Number of tokens to be emitted */ function _deliverTokens(address beneficiary, uint256 tokenAmount) internal { _token.safeTransfer(beneficiary, tokenAmount); } /** * @dev Executed when a purchase has been validated and is ready to be executed. Doesn't necessarily emit/send * tokens. * @param beneficiary Address receiving the tokens * @param tokenAmount Number of tokens to be purchased */ function _processPurchase(address beneficiary, uint256 tokenAmount) internal { _deliverTokens(beneficiary, tokenAmount); } /** * @dev Override for extensions that require an internal state to check for validity (current user contributions, * etc.) * @param beneficiary Address receiving the tokens * @param weiAmount Value in wei involved in the purchase */ function _updatePurchasingState(address beneficiary, uint256 weiAmount) internal { // solhint-disable-previous-line no-empty-blocks } /** * @dev Override to extend the way in which ether is converted to tokens. * @param weiAmount Value in wei to be converted into tokens * @return Number of tokens that can be purchased with the specified _weiAmount */ function _getTokenAmount(uint256 weiAmount) internal view returns (uint256) { return weiAmount.mul(_rate); } /** * @dev Determines how ETH is stored/forwarded on purchases. */ function _forwardFunds() internal { _wallet.transfer(msg.value); } } // File: openzeppelin-solidity/contracts/crowdsale/validation/CappedCrowdsale.sol /** * @title CappedCrowdsale * @dev Crowdsale with a limit for total contributions. */ contract CappedCrowdsale is Crowdsale { using SafeMath for uint256; uint256 private _cap; /** * @dev Constructor, takes maximum amount of wei accepted in the crowdsale. * @param cap Max amount of wei to be contributed */ constructor (uint256 cap) public { require(cap > 0, "CappedCrowdsale: cap is 0"); _cap = cap; } /** * @return the cap of the crowdsale. */ function cap() public view returns (uint256) { return _cap; } /** * @dev Checks whether the cap has been reached. * @return Whether the cap was reached */ function capReached() public view returns (bool) { return weiRaised() >= _cap; } /** * @dev Extend parent behavior requiring purchase to respect the funding cap. * @param beneficiary Token purchaser * @param weiAmount Amount of wei contributed */ function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal view { super._preValidatePurchase(beneficiary, weiAmount); require(weiRaised().add(weiAmount) <= _cap, "CappedCrowdsale: cap exceeded"); } } // File: openzeppelin-solidity/contracts/crowdsale/validation/TimedCrowdsale.sol /** * @title TimedCrowdsale * @dev Crowdsale accepting contributions only within a time frame. */ contract TimedCrowdsale is Crowdsale { using SafeMath for uint256; uint256 private _openingTime; uint256 private _closingTime; /** * Event for crowdsale extending * @param newClosingTime new closing time * @param prevClosingTime old closing time */ event TimedCrowdsaleExtended(uint256 prevClosingTime, uint256 newClosingTime); /** * @dev Reverts if not in crowdsale time range. */ modifier onlyWhileOpen { require(isOpen(), "TimedCrowdsale: not open"); _; } /** * @dev Constructor, takes crowdsale opening and closing times. * @param openingTime Crowdsale opening time * @param closingTime Crowdsale closing time */ constructor (uint256 openingTime, uint256 closingTime) public { // solhint-disable-next-line not-rely-on-time require(openingTime >= block.timestamp, "TimedCrowdsale: opening time is before current time"); // solhint-disable-next-line max-line-length require(closingTime > openingTime, "TimedCrowdsale: opening time is not before closing time"); _openingTime = openingTime; _closingTime = closingTime; } /** * @return the crowdsale opening time. */ function openingTime() public view returns (uint256) { return _openingTime; } /** * @return the crowdsale closing time. */ function closingTime() public view returns (uint256) { return _closingTime; } /** * @return true if the crowdsale is open, false otherwise. */ function isOpen() public view returns (bool) { // solhint-disable-next-line not-rely-on-time return block.timestamp >= _openingTime && block.timestamp <= _closingTime; } /** * @dev Checks whether the period in which the crowdsale is open has already elapsed. * @return Whether crowdsale period has elapsed */ function hasClosed() public view returns (bool) { // solhint-disable-next-line not-rely-on-time return block.timestamp > _closingTime; } /** * @dev Extend parent behavior requiring to be within contributing period. * @param beneficiary Token purchaser * @param weiAmount Amount of wei contributed */ function _preValidatePurchase(address beneficiary, uint256 weiAmount) internal onlyWhileOpen view { super._preValidatePurchase(beneficiary, weiAmount); } /** * @dev Extend crowdsale. * @param newClosingTime Crowdsale closing time */ function _extendTime(uint256 newClosingTime) internal { require(!hasClosed(), "TimedCrowdsale: already closed"); // solhint-disable-next-line max-line-length require(newClosingTime > _closingTime, "TimedCrowdsale: new closing time is before current closing time"); emit TimedCrowdsaleExtended(_closingTime, newClosingTime); _closingTime = newClosingTime; } } // File: openzeppelin-solidity/contracts/crowdsale/distribution/FinalizableCrowdsale.sol /** * @title FinalizableCrowdsale * @dev Extension of TimedCrowdsale with a one-off finalization action, where one * can do extra work after finishing. */ contract FinalizableCrowdsale is TimedCrowdsale { using SafeMath for uint256; bool private _finalized; event CrowdsaleFinalized(); constructor () internal { _finalized = false; } /** * @return true if the crowdsale is finalized, false otherwise. */ function finalized() public view returns (bool) { return _finalized; } /** * @dev Must be called after crowdsale ends, to do some extra finalization * work. Calls the contract's finalization function. */ function finalize() public { require(!_finalized, "FinalizableCrowdsale: already finalized"); require(hasClosed(), "FinalizableCrowdsale: not closed"); _finalized = true; _finalization(); emit CrowdsaleFinalized(); } /** * @dev Can be overridden to add finalization logic. The overriding function * should call super._finalization() to ensure the chain of finalization is * executed entirely. */ function _finalization() internal { // solhint-disable-previous-line no-empty-blocks } } // File: openzeppelin-solidity/contracts/ownership/Secondary.sol /** * @dev A Secondary contract can only be used by its primary account (the one that created it). */ contract Secondary is Context { address private _primary; /** * @dev Emitted when the primary contract changes. */ event PrimaryTransferred( address recipient ); /** * @dev Sets the primary account to the one that is creating the Secondary contract. */ constructor () internal { _primary = _msgSender(); emit PrimaryTransferred(_primary); } /** * @dev Reverts if called from any account other than the primary. */ modifier onlyPrimary() { require(_msgSender() == _primary, "Secondary: caller is not the primary account"); _; } /** * @return the address of the primary. */ function primary() public view returns (address) { return _primary; } /** * @dev Transfers contract to a new primary. * @param recipient The address of new primary. */ function transferPrimary(address recipient) public onlyPrimary { require(recipient != address(0), "Secondary: new primary is the zero address"); _primary = recipient; emit PrimaryTransferred(_primary); } } // File: openzeppelin-solidity/contracts/payment/escrow/Escrow.sol /** * @title Escrow * @dev Base escrow contract, holds funds designated for a payee until they * withdraw them. * * Intended usage: This contract (and derived escrow contracts) should be a * standalone contract, that only interacts with the contract that instantiated * it. That way, it is guaranteed that all Ether will be handled according to * the `Escrow` rules, and there is no need to check for payable functions or * transfers in the inheritance tree. The contract that uses the escrow as its * payment method should be its primary, and provide public methods redirecting * to the escrow's deposit and withdraw. */ contract Escrow is Secondary { using SafeMath for uint256; using Address for address payable; event Deposited(address indexed payee, uint256 weiAmount); event Withdrawn(address indexed payee, uint256 weiAmount); mapping(address => uint256) private _deposits; function depositsOf(address payee) public view returns (uint256) { return _deposits[payee]; } /** * @dev Stores the sent amount as credit to be withdrawn. * @param payee The destination address of the funds. */ function deposit(address payee) public onlyPrimary payable { uint256 amount = msg.value; _deposits[payee] = _deposits[payee].add(amount); emit Deposited(payee, amount); } /** * @dev Withdraw accumulated balance for a payee, forwarding 2300 gas (a * Solidity `transfer`). * * NOTE: This function has been deprecated, use {withdrawWithGas} instead. * Calling contracts with fixed-gas limits is an anti-pattern and may break * contract interactions in network upgrades (hardforks). * https://diligence.consensys.net/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more.] * * @param payee The address whose funds will be withdrawn and transferred to. */ function withdraw(address payable payee) public onlyPrimary { uint256 payment = _deposits[payee]; _deposits[payee] = 0; payee.transfer(payment); emit Withdrawn(payee, payment); } /** * @dev Same as {withdraw}, but forwarding all gas to the recipient. * * WARNING: Forwarding all gas opens the door to reentrancy vulnerabilities. * Make sure you trust the recipient, or are either following the * checks-effects-interactions pattern or using {ReentrancyGuard}. * * _Available since v2.4.0._ */ function withdrawWithGas(address payable payee) public onlyPrimary { uint256 payment = _deposits[payee]; _deposits[payee] = 0; payee.sendValue(payment); emit Withdrawn(payee, payment); } } // File: openzeppelin-solidity/contracts/payment/escrow/ConditionalEscrow.sol /** * @title ConditionalEscrow * @dev Base abstract escrow to only allow withdrawal if a condition is met. * @dev Intended usage: See {Escrow}. Same usage guidelines apply here. */ contract ConditionalEscrow is Escrow { /** * @dev Returns whether an address is allowed to withdraw their funds. To be * implemented by derived contracts. * @param payee The destination address of the funds. */ function withdrawalAllowed(address payee) public view returns (bool); function withdraw(address payable payee) public { require(withdrawalAllowed(payee), "ConditionalEscrow: payee is not allowed to withdraw"); super.withdraw(payee); } } // File: openzeppelin-solidity/contracts/payment/escrow/RefundEscrow.sol /** * @title RefundEscrow * @dev Escrow that holds funds for a beneficiary, deposited from multiple * parties. * @dev Intended usage: See {Escrow}. Same usage guidelines apply here. * @dev The primary account (that is, the contract that instantiates this * contract) may deposit, close the deposit period, and allow for either * withdrawal by the beneficiary, or refunds to the depositors. All interactions * with `RefundEscrow` will be made through the primary contract. See the * `RefundableCrowdsale` contract for an example of `RefundEscrow`’s use. */ contract RefundEscrow is ConditionalEscrow { enum State { Active, Refunding, Closed } event RefundsClosed(); event RefundsEnabled(); State private _state; address payable private _beneficiary; /** * @dev Constructor. * @param beneficiary The beneficiary of the deposits. */ constructor (address payable beneficiary) public { require(beneficiary != address(0), "RefundEscrow: beneficiary is the zero address"); _beneficiary = beneficiary; _state = State.Active; } /** * @return The current state of the escrow. */ function state() public view returns (State) { return _state; } /** * @return The beneficiary of the escrow. */ function beneficiary() public view returns (address) { return _beneficiary; } /** * @dev Stores funds that may later be refunded. * @param refundee The address funds will be sent to if a refund occurs. */ function deposit(address refundee) public payable { require(_state == State.Active, "RefundEscrow: can only deposit while active"); super.deposit(refundee); } /** * @dev Allows for the beneficiary to withdraw their funds, rejecting * further deposits. */ function close() public onlyPrimary { require(_state == State.Active, "RefundEscrow: can only close while active"); _state = State.Closed; emit RefundsClosed(); } /** * @dev Allows for refunds to take place, rejecting further deposits. */ function enableRefunds() public onlyPrimary { require(_state == State.Active, "RefundEscrow: can only enable refunds while active"); _state = State.Refunding; emit RefundsEnabled(); } /** * @dev Withdraws the beneficiary's funds. */ function beneficiaryWithdraw() public { require(_state == State.Closed, "RefundEscrow: beneficiary can only withdraw while closed"); _beneficiary.transfer(address(this).balance); } /** * @dev Returns whether refundees can withdraw their deposits (be refunded). The overridden function receives a * 'payee' argument, but we ignore it here since the condition is global, not per-payee. */ function withdrawalAllowed(address) public view returns (bool) { return _state == State.Refunding; } } // File: openzeppelin-solidity/contracts/crowdsale/distribution/RefundableCrowdsale.sol /** * @title RefundableCrowdsale * @dev Extension of `FinalizableCrowdsale` contract that adds a funding goal, and the possibility of users * getting a refund if goal is not met. * * Deprecated, use `RefundablePostDeliveryCrowdsale` instead. Note that if you allow tokens to be traded before the goal * is met, then an attack is possible in which the attacker purchases tokens from the crowdsale and when they sees that * the goal is unlikely to be met, they sell their tokens (possibly at a discount). The attacker will be refunded when * the crowdsale is finalized, and the users that purchased from them will be left with worthless tokens. */ contract RefundableCrowdsale is Context, FinalizableCrowdsale { using SafeMath for uint256; // minimum amount of funds to be raised in weis uint256 private _goal; // refund escrow used to hold funds while crowdsale is running RefundEscrow private _escrow; /** * @dev Constructor, creates RefundEscrow. * @param goal Funding goal */ constructor (uint256 goal) public { require(goal > 0, "RefundableCrowdsale: goal is 0"); _escrow = new RefundEscrow(wallet()); _goal = goal; } /** * @return minimum amount of funds to be raised in wei. */ function goal() public view returns (uint256) { return _goal; } /** * @dev Investors can claim refunds here if crowdsale is unsuccessful. * @param refundee Whose refund will be claimed. */ function claimRefund(address payable refundee) public { require(finalized(), "RefundableCrowdsale: not finalized"); require(!goalReached(), "RefundableCrowdsale: goal reached"); _escrow.withdraw(refundee); } /** * @dev Checks whether funding goal was reached. * @return Whether funding goal was reached */ function goalReached() public view returns (bool) { return weiRaised() >= _goal; } /** * @dev Escrow finalization task, called when finalize() is called. */ function _finalization() internal { if (goalReached()) { _escrow.close(); _escrow.beneficiaryWithdraw(); } else { _escrow.enableRefunds(); } super._finalization(); } /** * @dev Overrides Crowdsale fund forwarding, sending funds to escrow. */ function _forwardFunds() internal { _escrow.deposit.value(msg.value)(_msgSender()); } } // File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol /** * @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 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")); } } // File: openzeppelin-solidity/contracts/access/Roles.sol /** * @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]; } } // File: openzeppelin-solidity/contracts/access/roles/MinterRole.sol contract MinterRole is Context { using Roles for Roles.Role; event MinterAdded(address indexed account); event MinterRemoved(address indexed account); Roles.Role private _minters; constructor () internal { _addMinter(_msgSender()); } 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); } } // File: openzeppelin-solidity/contracts/token/ERC20/ERC20Mintable.sol /** * @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 ERC20, MinterRole { /** * @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; } } // File: openzeppelin-solidity/contracts/crowdsale/emission/MintedCrowdsale.sol /** * @title MintedCrowdsale * @dev Extension of Crowdsale contract whose tokens are minted in each purchase. * Token ownership should be transferred to MintedCrowdsale for minting. */ contract MintedCrowdsale is Crowdsale { /** * @dev Overrides delivery by minting tokens upon purchase. * @param beneficiary Token purchaser * @param tokenAmount Number of tokens to be minted */ function _deliverTokens(address beneficiary, uint256 tokenAmount) internal { // Potentially dangerous assumption about the type of the token. require( ERC20Mintable(address(token())).mint(beneficiary, tokenAmount), "MintedCrowdsale: minting failed" ); } } // File: openzeppelin-solidity/contracts/token/ERC20/ERC20Detailed.sol /** * @dev Optional functions from the ERC20 standard. */ contract ERC20Detailed is IERC20 { string private _name; string private _symbol; uint8 private _decimals; /** * @dev Sets the values for `name`, `symbol`, and `decimals`. All three of * these values are immutable: they can only be set once during * construction. */ constructor (string memory name, string memory symbol, uint8 decimals) public { _name = name; _symbol = symbol; _decimals = decimals; } /** * @dev Returns the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view returns (string memory) { return _symbol; } /** * @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 _decimals; } } // File: contracts/CovidToken.sol // solium-disable linebreak-style pragma solidity >=0.4.21 <0.7.0; /** * @title SampleCrowdsaleToken * @dev Very simple ERC20 Token that can be minted. * It is meant to be used in a crowdsale contract. */ contract ulluToken is ERC20Mintable, ERC20Detailed { constructor( string memory _name, string memory _symbol, uint8 _decimals) ERC20Detailed(_name, _symbol, _decimals) public { } } /** * @title SampleCrowdsale * @dev This is an example of a fully fledged crowdsale. * The way to add new features to a base crowdsale is by multiple inheritance. * In this example we are providing following extensions: * CappedCrowdsale - sets a max boundary for raised funds * RefundableCrowdsale - set a min goal to be reached and returns funds if it's not met * MintedCrowdsale - assumes the token can be minted by the crowdsale, which does so * when receiving purchases. * * After adding multiple features it's good practice to run integration tests * to ensure that subcontracts works together as intended. */
Contract Security Audit
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Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000120000000000000000000000000000000000000000000000000000000000000004756c6c75000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004554c4c5500000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): ullu
Arg [1] : _symbol (string): ULLU
Arg [2] : _decimals (uint8): 18
-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [4] : 756c6c7500000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [6] : 554c4c5500000000000000000000000000000000000000000000000000000000
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Swarm Source
bzzr://e49b27d0e3b76fbea1704da650a2b64ef784f17976fdbc3d14d322542f473846
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