Contract 0x4eeC0Ed0d135cAbC6bB97e87379a65368fD018F4 1

 

Contract Overview

Balance:
29.15000000000000002 BNB

BNB Value:
$16,168.92 (@ $554.68/BNB)

Token:
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x051a8728ba6f90bdfc14e4ebebba6d2531c169415a11666edaa24894f39f615aRedeem128342862021-11-21 12:46:0715 days 1 hr ago0x78dc97268e579888544b7e202a9ccd6fe5878234 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x1c214641ebbf8508d78475c2e9f6b51c4f1b15c8f422250165945590cef44c31Redeem126827442021-11-16 0:24:0920 days 13 hrs ago0xa4e131a22df699e6b3ee2933b614bd75457f6bd7 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x6f201fface85a8c515a109a988f8d8605bcc84a3155aab2faa57762abd82a6bbRedeem125493182021-11-11 4:55:4825 days 9 hrs ago0x56d45dd99dfcfd7898b6aa209ac2acde89f9e5ad IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x328115e65eef22932266a29e4843a1df224d166a877e9b84c90483d33ea38273Redeem125247212021-11-10 7:19:2326 days 6 hrs ago0xffb1e15980288297a7273d911cc7f642acd4de0a IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x9fd18829dc9acd876b24cea9490633c64d4ca0b20aef0f49b05086516b098e83Redeem123384702021-11-03 17:57:1732 days 19 hrs ago0xd0048be3375987263dcbec4c95b244e8c2f222ef IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0xdcf4ba3f0366ee8416cf8ace856a73892f52c758d1837d4aa316f34bef6320b5Approve123304602021-11-03 10:44:1833 days 3 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.000220805
0xb84a8e03d2e757ac531f6aa9aeedf220881c3b3fb2b6fb0392fabcfedbfa2861Mint123304572021-11-03 10:44:0933 days 3 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00027485
0x5d8ec0f8f07dcb892c55bfc135af8ec2be83033d4a2896e0f024c8b5275f6a40Transfer123304552021-11-03 10:44:0333 days 3 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f45.25 BNB0.000110555
0xff59d82ba976826b8c1411f147d2b1c59c08b74a37ddcbe93f6b55d90d10be9bRedeem122756792021-11-01 11:45:1235 days 2 hrs ago0xc8cac7985e716aa5e87621e567e3e49c08b489a1 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x047c4654d63cf85f275a329594d709f0fcc827c084b958c78fe3979600e00599Redeem121525042021-10-28 3:00:5139 days 10 hrs ago0x424bdea7365bc7b25d60927c0b48cf3204c99547 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016961
0x671a8e262345388f9e3e0d1b8c2e0dbd6fcfafbbf05bff8947f7d04563e29747Redeem118508282021-10-17 12:15:4850 days 1 hr ago0xc3465b3200ffe73e5ae9261cbb6455b842e5bf79 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x5c002301dee11fd6da98a81c5e8275351910722eef594404c702e34a059509eeRedeem110996772021-09-21 5:47:1176 days 8 hrs ago0x9b352af76f759a49f0bb8be1c9d9483424cda430 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x9af5d51085c61aa44a1fcd34e1c21675460939050bb7da69ba799f69cf52f64eApprove109253452021-09-15 3:55:2682 days 10 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.000220805
0x4048d1baa98827864a1647d1d9bcc61fb52dc159e6cbdcfde9fb198bb749f4d8Mint109253422021-09-15 3:55:1782 days 10 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00027485
0x71f25116005756f19f5015f0b5b8ccd2e9f51eb5844958eac91a0fa98d62b053Transfer109253402021-09-15 3:55:1182 days 10 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f45.3 BNB0.000110555
0xaa51000baf4fe43e65d32de320937663e20a65bc1ab6a56b5ad9defc5cbedc61Transfer109251372021-09-15 3:45:0282 days 10 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40.7 BNB0.000110555
0xcd58f6a9b22c304f8ce5691aff4d50fbc1456ee70ce67565f078f25c0aed1125Redeem104504392021-08-29 12:24:0799 days 1 hr ago0x108a3ea7ec24c41040e64bea970c8a71c742416f IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x76f59bff8d492dbb78de279c51ded5087879306fb2b881d82c62a15f571b83eaRedeem100537262021-08-15 15:14:53112 days 22 hrs ago0xb91a8589a9251f4b7fa78cfd5a777a5d91f03900 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0xa7df86c26d492abf90c271cf53a58defde1c8ed2782384f9fc81a7d3680f0a90Redeem100303002021-08-14 19:42:57113 days 18 hrs ago0x08533afc6f839ddcea6a85ee243e519c644abcf1 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x9da4205693c54acb762e097c76795862b1229881bcb62a2d22934ba6a2251052Approve98668762021-08-09 0:28:28119 days 13 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.000220805
0xd428cb35aaacff85afc2aeac63e85269decdd3382d853a2b6698d901f4865eeeMint98668732021-08-09 0:28:19119 days 13 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00027485
0xef8a50c66a7c4114e6b734dbac8e9da81ffcff8f48a124bf0e626ed79ae2b4fcTransfer98668702021-08-09 0:28:10119 days 13 hrs ago0x79105ce19a3d44c59ca48f827d865601a6945a1b IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40.15 BNB0.000110555
0x696ddb93161a8916aec08128c575dc3546977e76f88bd52460b57e017ca59673Redeem98020352021-08-06 16:54:19121 days 21 hrs ago0x7608d9c79baeac6b3ed2ccd458de983737928105 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0x3d49808be4516a7b63dcc2e5e3455cd2f4222e7d47820c461d437a25a6cf0ad1Redeem97097392021-08-03 9:23:43125 days 4 hrs ago0xb333d02b679f6f7a4b325de16246b7501fdc5c29 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
0xeb3d78e9a88b6eb5c17ea1e9bdea2a4f19779b37d9fcb87d97fbf4b751d6a988Redeem96855022021-08-02 11:55:56126 days 2 hrs ago0x3d267a32f84d14b22822301c2659556b8faad930 IN  0x4eec0ed0d135cabc6bb97e87379a65368fd018f40 BNB0.00016955
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Latest 18 internal transactions
Parent Txn Hash Block From To Value
0x051a8728ba6f90bdfc14e4ebebba6d2531c169415a11666edaa24894f39f615a128342862021-11-21 12:46:0715 days 1 hr ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x78dc97268e579888544b7e202a9ccd6fe58782340.5 BNB
0x1c214641ebbf8508d78475c2e9f6b51c4f1b15c8f422250165945590cef44c31126827442021-11-16 0:24:0920 days 13 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xa4e131a22df699e6b3ee2933b614bd75457f6bd70.5 BNB
0x6f201fface85a8c515a109a988f8d8605bcc84a3155aab2faa57762abd82a6bb125493182021-11-11 4:55:4825 days 9 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x56d45dd99dfcfd7898b6aa209ac2acde89f9e5ad0.5 BNB
0x328115e65eef22932266a29e4843a1df224d166a877e9b84c90483d33ea38273125247212021-11-10 7:19:2326 days 6 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xffb1e15980288297a7273d911cc7f642acd4de0a0.5 BNB
0x9fd18829dc9acd876b24cea9490633c64d4ca0b20aef0f49b05086516b098e83123384702021-11-03 17:57:1732 days 19 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xd0048be3375987263dcbec4c95b244e8c2f222ef0.5 BNB
0xff59d82ba976826b8c1411f147d2b1c59c08b74a37ddcbe93f6b55d90d10be9b122756792021-11-01 11:45:1235 days 2 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xc8cac7985e716aa5e87621e567e3e49c08b489a10.5 BNB
0x047c4654d63cf85f275a329594d709f0fcc827c084b958c78fe3979600e00599121525042021-10-28 3:00:5139 days 10 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x424bdea7365bc7b25d60927c0b48cf3204c995471 BNB
0x671a8e262345388f9e3e0d1b8c2e0dbd6fcfafbbf05bff8947f7d04563e29747118508282021-10-17 12:15:4850 days 1 hr ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xc3465b3200ffe73e5ae9261cbb6455b842e5bf790.5 BNB
0x5c002301dee11fd6da98a81c5e8275351910722eef594404c702e34a059509ee110996772021-09-21 5:47:1176 days 8 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x9b352af76f759a49f0bb8be1c9d9483424cda4300.5 BNB
0xcd58f6a9b22c304f8ce5691aff4d50fbc1456ee70ce67565f078f25c0aed1125104504392021-08-29 12:24:0799 days 1 hr ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x108a3ea7ec24c41040e64bea970c8a71c742416f0.5 BNB
0x76f59bff8d492dbb78de279c51ded5087879306fb2b881d82c62a15f571b83ea100537262021-08-15 15:14:53112 days 22 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xb91a8589a9251f4b7fa78cfd5a777a5d91f039000.5 BNB
0xa7df86c26d492abf90c271cf53a58defde1c8ed2782384f9fc81a7d3680f0a90100303002021-08-14 19:42:57113 days 18 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x08533afc6f839ddcea6a85ee243e519c644abcf10.5 BNB
0x696ddb93161a8916aec08128c575dc3546977e76f88bd52460b57e017ca5967398020352021-08-06 16:54:19121 days 21 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x7608d9c79baeac6b3ed2ccd458de9837379281050.5 BNB
0x3d49808be4516a7b63dcc2e5e3455cd2f4222e7d47820c461d437a25a6cf0ad197097392021-08-03 9:23:43125 days 4 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xb333d02b679f6f7a4b325de16246b7501fdc5c290.5 BNB
0xeb3d78e9a88b6eb5c17ea1e9bdea2a4f19779b37d9fcb87d97fbf4b751d6a98896855022021-08-02 11:55:56126 days 2 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x3d267a32f84d14b22822301c2659556b8faad9300.75 BNB
0x8e381cf4f4e1e7fec6b13c6091ddc8e5bfe92ce903dc5c8c6469e0b411cfb93a96394932021-07-31 20:19:58127 days 17 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x99079720971ac97965f25bbdbecf6b52f131212a0.5 BNB
0x76744d8eff0ec5df4e7beac738401927849414a0d57223ba3d2b9e73ae73b60496100692021-07-30 19:17:13128 days 18 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40x20da92e7d88eb154e7efa1216ef728c45e65d7ac0.5 BNB
0x4e0acba1e37d859bbe35ebb5bddde252840657a0c10180b487dca076303aff0e95885852021-07-30 0:59:33129 days 12 hrs ago 0x4eec0ed0d135cabc6bb97e87379a65368fd018f40xf43e0e6e4cc5b84896c94e5d943022313b9872c51.5 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
Goal

Compiler Version
v0.8.6+commit.11564f7e

Optimization Enabled:
Yes with 999999 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 8 : Ownable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _setOwner(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _setOwner(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 2 of 8 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

File 3 of 8 : ERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.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 {ERC20PresetMinterPauser}.
 *
 * 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, IERC20Metadata {
    mapping(address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override 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. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * 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 virtual override returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override 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 virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override 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 virtual override returns (bool) {
        _transfer(sender, recipient, amount);

        uint256 currentAllowance = _allowances[sender][_msgSender()];
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
            _approve(sender, _msgSender(), currentAllowance - amount);
        }

        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 virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + 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 virtual returns (bool) {
        uint256 currentAllowance = _allowances[_msgSender()][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(_msgSender(), spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient`.
     *
     * This 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 virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        uint256 senderBalance = _balances[sender];
        require(senderBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[sender] = senderBalance - amount;
        }
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);

        _afterTokenTransfer(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:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        _balances[account] += amount;
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(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 virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
        }
        _totalSupply -= amount;

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This 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 virtual {
        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 Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 4 of 8 : IERC20.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
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 5 of 8 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 6 of 8 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @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) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @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].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) private pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

File 7 of 8 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/*
 * @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 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.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 8 of 8 : Goal.sol
// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity =0.8.6;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

/**
 * @title NFTKEY Goal Token
 * NFTKEY participation reward token
 */
contract Goal is ERC20, Ownable, ReentrancyGuard {
    using Address for address;

    event Mint(address indexed account, uint256 amount);
    event Redeem(address indexed account, uint256 ethAmount, uint256 amount);
    event AddReward(uint256 amount);

    constructor() ERC20("Goal Token", "GOAL") {}

    uint256 public unitValue = 50000000000000000; // 0.05 is the minimum Goal token unit value
    uint256 public expireTimestamp = 1640995200; // Sat Jan 01 2022 00:00:00 GMT+0000

    /**
     * @dev Update floor unit value of Goal token to be minted
     * @param _newValue new value of Goal token
     */
    function updateUnitValue(uint256 _newValue) external onlyOwner {
        require(_newValue >= 50000000000000000, "Minimum unit value is 0.05");
        require(
            (totalSupply() * _newValue) / 1e18 <= address(this).balance,
            "Can't increase unit value more than total redeemable amount"
        );

        unitValue = _newValue;
    }

    /**
     * @dev Mint Goal to account
     * @param account address to mint tokens to
     * @param amount amount of GOAL tokens to mint
     */
    function mint(address account, uint256 amount) external onlyOwner {
        require(account != address(0), "Should not mint to 0 address");
        require(
            ((amount + totalSupply()) * unitValue) / 1e18 <= address(this).balance,
            "Don't have enough fund to mint tokens"
        );

        _mint(account, amount);

        emit Mint(account, amount);
    }

    /**
     * @dev Redeem Goal to ETH
     * @param amount Amount of Goal to redeem for ETH
     * Goal is burnt when redeemed to ETH
     */
    function redeem(uint256 amount) external nonReentrant {
        require(amount > 0, "Redeeming 0 GOAL");
        require(amount <= balanceOf(msg.sender), "Attemping to redeem more than owned GOAL");

        uint256 ethAmount = (amount * unitValue) / 1e18;

        _burn(msg.sender, amount);

        Address.sendValue(payable(msg.sender), ethAmount);

        emit Redeem(msg.sender, ethAmount, amount);
    }

    receive() external payable {
        emit AddReward(msg.value);
    }

    /**
     * @dev withdraw all ETH
     * Withdraw ETH to owner
     */
    function withdraw() external onlyOwner {
        require(block.timestamp >= expireTimestamp, "Can't withdraw fund before expiration");

        Address.sendValue(payable(msg.sender), address(this).balance);
    }
}

Settings
{
  "remappings": [],
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

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uts":[{"internalType":"uint256","name":"_newValue","type":"uint256"}],"name":"updateUnitValue","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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