Contract 0x6fe947ffd91ae3a7c8a6090b692ca2bdecd30269

 
 
Txn Hash
Method
Block
From
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Value [Txn Fee]
0x33ae86fb3a790c0102335e6c6a8043c3ca99a44d6c0fe9015c3c9aba8022946cApprove386682152023-01-29 14:41:442 days 18 hrs ago0x70b51ae472fe4f1720daa6e312b65c3a3494fede IN  Taco Tribe: GUAC Token0 MATIC0.002971299913 64.1860346
0x8b602d94210772dfc84ed4768485fd986b3e37b6c77c2c3971488762eb8e7f92Approve386572282023-01-29 8:01:373 days 1 hr ago0xe733090147a31290806b6c6499095d98ce302022 IN  Taco Tribe: GUAC Token0 MATIC0.001686631453 63.877876589
0xc8fa2cc96d020ad33040e453f6b3a9499a4e475b122cd6b7852b1f7f0667f677Approve386571152023-01-29 7:57:373 days 1 hr ago0xe733090147a31290806b6c6499095d98ce302022 IN  Taco Tribe: GUAC Token0 MATIC0.001586540455 60.087125264
0x294e92e34e2aca4d94b101691e6e051ae31ae25d5d4175a0b92ccee1642af562Approve386569762023-01-29 7:52:133 days 1 hr ago0xe733090147a31290806b6c6499095d98ce302022 IN  Taco Tribe: GUAC Token0 MATIC0.001461324455 55.344813503
0x4679e7904bafbe014d01236451ba6616c3c5b1650d9270efcacb982b7491236dApprove386568762023-01-29 7:48:053 days 1 hr ago0xe733090147a31290806b6c6499095d98ce302022 IN  Taco Tribe: GUAC Token0 MATIC0.001674797931 63.429705017
0xa3fa82a113ca42e717562267672e6085d634066736ad6a0ea8e1dacd00c189d2Approve386568652023-01-29 7:47:433 days 1 hr ago0xe733090147a31290806b6c6499095d98ce302022 IN  Taco Tribe: GUAC Token0 MATIC0.002743899988 59.258379163
0x044f8542f36bbbaa0b2b3a7dbdc67c21f62234a12bea80279a62ee93cad42953Approve386567542023-01-29 7:43:133 days 1 hr ago0xe733090147a31290806b6c6499095d98ce302022 IN  Taco Tribe: GUAC Token0 MATIC0.001816358442 62.195536317
0xb70cc4637113ec7af9ea92b3b9686d718dd6530cd684956c7d166794f1248a9bApprove385928332023-01-27 16:06:094 days 17 hrs ago0x6b88468fedb65f6de5ed65a5542a32a304634a45 IN  Taco Tribe: GUAC Token0 MATIC0.003662309041 79.113216998
0xe387a52fa1f6ed15fa47cbc6b4b0a2cb80c56b14118b647c91d04d293f48e816Approve385733922023-01-27 3:43:125 days 5 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001284502816 48.67015823
0x322642a5b011b663aad5696a8d57401544ca83d802876db599086931e0c3210cApprove385732012023-01-27 3:36:265 days 5 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001284502816 48.67015823
0x132d125cdaaeb08260f2cc16f17cffe2842ee484f28c37fac051fd64dc4b7e3bApprove385731312023-01-27 3:33:565 days 5 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001351185486 51.196782609
0x6de589d30b5d975bce94b05d244293c7b26be0587450fb14bc6a83d2f6b7db10Approve385731012023-01-27 3:32:525 days 5 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001217520029 46.132162385
0x75623290c5d6c8cd2670d276f4df5cd86421848a9d3e4049a7cd2179bfff6021Approve385730072023-01-27 3:29:325 days 5 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001718737751 65.123437101
0x53555881c5800108b6ef771f189b93800c27e635d67c2a29bd7db6df2086db95Approve385728962023-01-27 3:25:385 days 5 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001718737751 65.123437101
0x7975578bf734325bc5c53660a52d64edeb428fbfd756dd5e895988e67cd6fa13Approve385728442023-01-27 3:23:275 days 5 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001746667033 66.181685096
0x3228066e09f062168616ce0235253b48e0de24d358817b7fed6fcc3e4866b0f2Approve385728182023-01-27 3:22:335 days 6 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001748606801 66.255183428
0xaed9a2d8c391c37704f938fcd7d631abab67d852d0f05b541545e03a145ecaf4Approve385727882023-01-27 3:21:295 days 6 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.002530738233 54.669019125
0x2a7e8aacd1b3644d0a1f04ab8a1b2627084f075d3b068eadcb6b472f6b9cdb31Approve385727542023-01-27 3:20:175 days 6 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001865603661 63.908045393
0x36c98c4be5c75469c8ad4c44bbcf07ae7f1d83d8af66d4d208b76a56f158f93cApprove385727462023-01-27 3:19:595 days 6 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.001713683882 64.931944627
0xa771124f5ffb776a6b1d73ddb7eae3192583aff93fcc610c5b99cf6896d389caApprove385725762023-01-27 3:13:275 days 6 hrs ago0x9011444a3cac603c4302c11b6944e2f4af69b16a IN  Taco Tribe: GUAC Token0 MATIC0.004217303591 91.102211852
0x45b87da2487d1a7b86b15a5c860e5975c136b106cbcc9198a2df75d5dc8a6c86Approve385505212023-01-26 13:45:295 days 19 hrs ago0x3fdcff4caa234fbd40621de0e6d940cbc21fce96 IN  Taco Tribe: GUAC Token0 MATIC0.023355285649 504.520989573
0xd6709f6066f63258d231f5b612647225feb5f201539177dd1379d181815c01f1Approve385048632023-01-25 10:08:006 days 23 hrs ago0xd1e7ccb86fc82a3733f03cfe011b92015abc7b47 IN  Taco Tribe: GUAC Token0 MATIC0.002314018997 49.987449192
0xf1cf6deb64a63beea0b53c5f282bddec058f17130a2dbd7937d29a706b98d19bApprove384425212023-01-23 20:36:008 days 12 hrs ago0x91fd77c91e7378958be1a562a99abb6523c1218d IN  Taco Tribe: GUAC Token0 MATIC0.002817117383 60.855382871
0x636186714dc2b6165207850ec222e57994869e62e68c27817450daf32b2a99eaApprove383942302023-01-22 15:43:359 days 17 hrs ago0x90e20aa8c2cb87fc1b97f5b49bef55a2bd77b4e2 IN  Taco Tribe: GUAC Token0 MATIC0.002726883739 93.373638522
0x4e511c7f91b75d15c912f1ca2ab9e123229764ae23485ff667536b3c0e6e6642Approve383640672023-01-21 21:38:5310 days 11 hrs ago0xfc1cfdd8b33b42080bac1408d63007c0078b4df9 IN  Taco Tribe: GUAC Token0 MATIC0.001050503054 39.785754223
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OVERVIEW

$GUAC Token is used as rewards in the staking of Taco Tribe NFTs.

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Contract Source Code Verified (Exact Match)

Contract Name:
GUACToken

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2022-04-11
*/

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

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 `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, 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 `from` to `to` 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 from,
        address to,
        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/contracts/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;


/**
 * @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: @openzeppelin/contracts/utils/Context.sol


// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

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: @openzeppelin/contracts/token/ERC20/ERC20.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;




/**
 * @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 Contracts guidelines: functions revert
 * instead 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:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, 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}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, 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}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, 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) {
        address owner = _msgSender();
        _approve(owner, spender, _allowances[owner][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) {
        address owner = _msgSender();
        uint256 currentAllowance = _allowances[owner][spender];
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, 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:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
        }
        _balances[to] += amount;

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, 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 Spend `amount` form the allowance of `owner` toward `spender`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - 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: @openzeppelin/contracts/token/ERC20/extensions/ERC20Burnable.sol


// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/extensions/ERC20Burnable.sol)

pragma solidity ^0.8.0;



/**
 * @dev Extension of {ERC20} that allows token holders to destroy both their own
 * tokens and those that they have an allowance for, in a way that can be
 * recognized off-chain (via event analysis).
 */
abstract contract ERC20Burnable is Context, ERC20 {
    /**
     * @dev Destroys `amount` tokens from the caller.
     *
     * See {ERC20-_burn}.
     */
    function burn(uint256 amount) public virtual {
        _burn(_msgSender(), amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, deducting from the caller's
     * allowance.
     *
     * See {ERC20-_burn} and {ERC20-allowance}.
     *
     * Requirements:
     *
     * - the caller must have allowance for ``accounts``'s tokens of at least
     * `amount`.
     */
    function burnFrom(address account, uint256 amount) public virtual {
        _spendAllowance(account, _msgSender(), amount);
        _burn(account, amount);
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol


// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;


/**
 * @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() {
        _transferOwnership(_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 {
        _transferOwnership(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");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// File: contracts/GUACToken.sol



pragma solidity 0.8.4;





contract GUACToken is ERC20, ERC20Burnable, Ownable {

  mapping(address => bool) controllers;
  
  constructor() ERC20("GUACToken", "GUAC") { }

  function mint(address to, uint256 amount) external {
    require(controllers[msg.sender], "Only controllers can mint");
    _mint(to, amount);
  }

  function burnFrom(address account, uint256 amount) public override {
      if (controllers[msg.sender]) {
          _burn(account, amount);
      }
      else {
          super.burnFrom(account, amount);
      }
  }

  function addController(address controller) external onlyOwner {
    controllers[controller] = true;
  }

  function removeController(address controller) external onlyOwner {
    controllers[controller] = false;
  }
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://99c028ad2a84d53d5b601a40edec0d28175bcd2de6475663245a41274a89e917
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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