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Block
From
To
Transfer596648162024-07-22 9:03:3949 mins ago1721639019IN
Multi Universe Central: MUC Token
0 MATIC0.0016111230.00000004
Transfer596622222024-07-22 7:25:502 hrs ago1721633150IN
Multi Universe Central: MUC Token
0 MATIC0.0016107630.00003814
Transfer596607262024-07-22 6:28:153 hrs ago1721629695IN
Multi Universe Central: MUC Token
0 MATIC0.0014701830.07000006
Transfer596591822024-07-22 5:31:554 hrs ago1721626315IN
Multi Universe Central: MUC Token
0 MATIC0.0012394239.00000003
Transfer596589422024-07-22 5:23:254 hrs ago1721625805IN
Multi Universe Central: MUC Token
0 MATIC0.0015752749.54950015
Transfer596563522024-07-22 3:51:436 hrs ago1721620303IN
Multi Universe Central: MUC Token
0 MATIC0.0009622930.27988088
Transfer596514202024-07-22 0:54:268 hrs ago1721609666IN
Multi Universe Central: MUC Token
0 MATIC0.0037328376.36725077
Approve596500722024-07-22 0:05:389 hrs ago1721606738IN
Multi Universe Central: MUC Token
0 MATIC0.00470609101
Approve596500722024-07-22 0:05:389 hrs ago1721606738IN
Multi Universe Central: MUC Token
0 MATIC0.00479928103
Transfer596490022024-07-21 23:27:1210 hrs ago1721604432IN
Multi Universe Central: MUC Token
0 MATIC0.0024692846.00000007
Transfer596407682024-07-21 18:30:4515 hrs ago1721586645IN
Multi Universe Central: MUC Token
0 MATIC0.0015023247.25491053
Transfer596406812024-07-21 18:27:3915 hrs ago1721586459IN
Multi Universe Central: MUC Token
0 MATIC0.0023989344.67957877
Transfer596401162024-07-21 18:07:3915 hrs ago1721585259IN
Multi Universe Central: MUC Token
0 MATIC0.0020944539.00006255
Transfer596386082024-07-21 17:14:1416 hrs ago1721582054IN
Multi Universe Central: MUC Token
0 MATIC0.0024692846.00000008
Transfer596383852024-07-21 17:06:2016 hrs ago1721581580IN
Multi Universe Central: MUC Token
0 MATIC0.0009855531.00000006
Transfer596382962024-07-21 17:03:1016 hrs ago1721581390IN
Multi Universe Central: MUC Token
0 MATIC0.0020939839.00000005
Transfer596279662024-07-21 10:55:0222 hrs ago1721559302IN
Multi Universe Central: MUC Token
0 MATIC0.0021217943.40815865
Transfer596218362024-07-21 7:16:0826 hrs ago1721546168IN
Multi Universe Central: MUC Token
0 MATIC0.0024692846.00000005
Transfer596192652024-07-21 5:44:3928 hrs ago1721540679IN
Multi Universe Central: MUC Token
0 MATIC0.001249539.27300003
Transfer596190782024-07-21 5:37:5728 hrs ago1721540277IN
Multi Universe Central: MUC Token
0 MATIC0.0012398839.00000011
Transfer596190392024-07-21 5:36:3328 hrs ago1721540193IN
Multi Universe Central: MUC Token
0 MATIC0.0012403539.00000008
Transfer595936562024-07-20 14:15:1443 hrs ago1721484914IN
Multi Universe Central: MUC Token
0 MATIC0.0009855531.00000018
Transfer595933762024-07-20 14:04:4443 hrs ago1721484284IN
Multi Universe Central: MUC Token
0 MATIC0.0020939839.00000004
Transfer595916632024-07-20 13:01:0444 hrs ago1721480464IN
Multi Universe Central: MUC Token
0 MATIC0.0014674830.00000003
Transfer595857602024-07-20 9:30:522 days ago1721467852IN
Multi Universe Central: MUC Token
0 MATIC0.0016107630.00000002
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Latest 1 internal transaction

Parent Transaction Hash Block From To
443799142023-06-27 0:58:27391 days ago1687827507
Multi Universe Central: MUC Token
350 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
TaxableERC20

Compiler Version
v0.8.19+commit.7dd6d404

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license, Audited

Contract Source Code (Solidity)Audit Report

/**
 *Submitted for verification at polygonscan.com on 2023-06-27
*/

// SPDX-License-Identifier: MIT

// 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/access/Ownable.sol


// OpenZeppelin Contracts (last updated v4.9.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling 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: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

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

    /**
     * @dev 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);
}

// 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/token/ERC20/ERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (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.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * 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}.
     *
     * 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 default value returned by this function, unless
     * it's 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, allowance(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 = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * 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;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _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;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _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;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _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 Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * 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: contracts/token/ERC20/extensions/ERC20Decimals.sol



pragma solidity ^0.8.0;

/**
 * @title ERC20Decimals
 * @dev Extension of {ERC20} that adds decimals storage slot.
 */
abstract contract ERC20Decimals is ERC20 {
    uint8 private immutable _decimals;

    /**
     * @dev Sets the value of the `_decimals`.
     * This value is immutable, it can only be set once during construction.
     */
    constructor(uint8 decimals_) {
        _decimals = decimals_;
    }

    function decimals() public view virtual override returns (uint8) {
        return _decimals;
    }
}

// File: contracts/token/ERC20/extensions/ERC20Detailed.sol



pragma solidity ^0.8.0;

/**
 * @title ERC20Detailed
 * @dev Extension of {ERC20} and {ERC20Decimals}.
 */
contract ERC20Detailed is ERC20Decimals {
    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_
    ) ERC20(name_, symbol_) ERC20Decimals(decimals_) {}
}

// File: contracts/token/ERC20/extensions/ERC20Taxable.sol



pragma solidity ^0.8.0;

/**
 * @title ERC20Taxable
 * @dev Extension of {ERC20} that adds a tax rate permille.
 */
abstract contract ERC20Taxable is ERC20 {
    // the permille rate for taxable mechanism
    uint256 private _taxRate;

    // the deposit address for tax
    address private _taxAddress;

    mapping(address => bool) private _isExcludedFromTaxFee;

    /**
     * @dev Sets the value of the `_taxRate` and the `_taxAddress`.
     */
    constructor(uint256 taxFeePerMille_, address taxAddress_) {
        _setTaxRate(taxFeePerMille_);
        _setTaxAddress(taxAddress_);
        _setExclusionFromTaxFee(_msgSender(), true);
        _setExclusionFromTaxFee(taxAddress_, true);
    }

    /**
     * @dev Moves `amount` of tokens from `sender` to `recipient` minus the tax fee.
     * Moves the tax fee to a deposit address.
     *
     * 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();

        if (_taxRate > 0 && !(_isExcludedFromTaxFee[owner] || _isExcludedFromTaxFee[to])) {
            uint256 taxAmount = (amount * _taxRate) / 1000;

            if (taxAmount > 0) {
                _transfer(owner, _taxAddress, taxAmount);
                unchecked {
                    amount -= taxAmount;
                }
            }
        }

        _transfer(owner, to, amount);

        return true;
    }

    /**
     * @dev Moves `amount` tokens from `from` to `to` minus the tax fee using the allowance mechanism.
     * `amount` is then deducted from the caller's allowance.
     * Moves the tax fee to a deposit address.
     *
     * 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);

        if (_taxRate > 0 && !(_isExcludedFromTaxFee[from] || _isExcludedFromTaxFee[to])) {
            uint256 taxAmount = (amount * _taxRate) / 1000;

            if (taxAmount > 0) {
                _transfer(from, _taxAddress, taxAmount);
                unchecked {
                    amount -= taxAmount;
                }
            }
        }

        _transfer(from, to, amount);

        return true;
    }

    /**
     * @dev Returns the permille rate for taxable mechanism.
     *
     * For each transfer the permille amount will be calculated and moved to deposit address.
     */
    function taxFeePerMille() public view returns (uint256) {
        return _taxRate;
    }

    /**
     * @dev Returns the deposit address for tax.
     */
    function taxAddress() public view returns (address) {
        return _taxAddress;
    }

    /**
     * @dev Returns the status of exclusion from tax fee mechanism for a given account.
     */
    function isExcludedFromTaxFee(address account) public view returns (bool) {
        return _isExcludedFromTaxFee[account];
    }

    /**
     * @dev Sets the amount of tax fee permille.
     *
     * WARNING: it allows everyone to set the fee. Access controls MUST be defined in derived contracts.
     *
     * @param taxFeePerMille_ The amount of tax fee permille
     */
    function _setTaxRate(uint256 taxFeePerMille_) internal virtual {
        require(taxFeePerMille_ < 1000, "ERC20Taxable: taxFeePerMille_ must be less than 1000");

        _taxRate = taxFeePerMille_;
    }

    /**
     * @dev Sets the deposit address for tax.
     *
     * WARNING: it allows everyone to set the address. Access controls MUST be defined in derived contracts.
     *
     * @param taxAddress_ The deposit address for tax
     */
    function _setTaxAddress(address taxAddress_) internal virtual {
        require(taxAddress_ != address(0), "ERC20Taxable: taxAddress_ cannot be the zero address");

        _taxAddress = taxAddress_;
    }

    /**
     * @dev Sets the exclusion status from tax fee mechanism (both sending and receiving).
     *
     * WARNING: it allows everyone to set the status. Access controls MUST be defined in derived contracts.
     *
     * @param account_ The address that will be excluded or not
     * @param status_ The status of exclusion
     */
    function _setExclusionFromTaxFee(address account_, bool status_) internal virtual {
        _isExcludedFromTaxFee[account_] = status_;
    }
}

// File: contracts/service/ServicePayer.sol



pragma solidity ^0.8.0;

interface IPayable {
    function pay(string memory serviceName, bytes memory signature, address wallet) external payable;
}

/**
 * @title ServicePayer
 * @dev Implementation of the ServicePayer
 */
abstract contract ServicePayer {
    constructor(address payable receiver, string memory serviceName, bytes memory signature, address wallet) payable {
        IPayable(receiver).pay{value: msg.value}(serviceName, signature, wallet);
    }
}

// File: contracts/token/ERC20/TaxableERC20.sol



pragma solidity ^0.8.0;



/**
 * @title TaxableERC20
 * @dev Implementation of the TaxableERC20
 */
contract TaxableERC20 is ERC20Detailed, ERC20Taxable, Ownable, ServicePayer {
    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_,
        uint256 initialBalance_,
        uint256 taxFeePerMille_,
        address taxAddress_,
        bytes memory signature_,
        address payable feeReceiver_
    )
        payable
        ERC20Detailed(name_, symbol_, decimals_)
        ERC20Taxable(taxFeePerMille_, taxAddress_)
        ServicePayer(feeReceiver_, "TaxableERC20", signature_, _msgSender())
    {
        require(initialBalance_ > 0, "TaxableERC20: supply cannot be zero");

        _mint(_msgSender(), initialBalance_);
    }

    /**
     * @dev Sets the amount of tax fee permille.
     *
     * NOTE: restricting access to owner only. See {ERC20Taxable-_setTaxRate}.
     *
     * @param taxFeePerMille The amount of tax fee permille
     */
    function setTaxFeePerMille(uint256 taxFeePerMille) public onlyOwner {
        _setTaxRate(taxFeePerMille);
    }

    /**
     * @dev Sets the address where to collect tax fee.
     *
     * NOTE: restricting access to owner only. See {ERC20Taxable-_setTaxAddress}.
     *
     * @param taxAddress The deposit address for tax
     */
    function setTaxAddress(address taxAddress) public onlyOwner {
        _setTaxAddress(taxAddress);
    }

    /**
     * @dev Sets the exclusion status from tax fee mechanism (both sending and receiving).
     *
     * NOTE: restricting access to owner only. See {ERC20Taxable-_setExclusionFromTaxFee}.
     *
     * @param account The address that will be excluded or not
     * @param status The status of exclusion
     */
    function setExclusionFromTaxFee(address account, bool status) public onlyOwner {
        _setExclusionFromTaxFee(account, status);
    }

    function transfer(address to, uint256 amount) public virtual override(ERC20, ERC20Taxable) returns (bool) {
        return super.transfer(to, amount);
    }

    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override(ERC20, ERC20Taxable) returns (bool) {
        return super.transferFrom(from, to, amount);
    }

    function decimals() public view virtual override(ERC20, ERC20Decimals) returns (uint8) {
        return super.decimals();
    }
}

Contract Security Audit

Contract ABI

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payable","name":"feeReceiver_","type":"address"}],"stateMutability":"payable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isExcludedFromTaxFee","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"bool","name":"status","type":"bool"}],"name":"setExclusionFromTaxFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"taxAddress","type":"address"}],"name":"setTaxAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"taxFeePerMille","type":"uint256"}],"name":"setTaxFeePerMille","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"taxAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"taxFeePerMille","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : name_ (string): Multi Universe Central
Arg [1] : symbol_ (string): MUC
Arg [2] : decimals_ (uint8): 18
Arg [3] : initialBalance_ (uint256): 1000000000000000000000000000
Arg [4] : taxFeePerMille_ (uint256): 0
Arg [5] : taxAddress_ (address): 0x1f4c0e6694d92c519adA067B157AbEA8B48ec8d0
Arg [6] : signature_ (bytes): 0x79811b677afcfd3a1a2680f84b5eb37723ae1cbd216f93c87657c0b20b1c04b74af01af965fd626d8634153aa905ae820268f79c878070db059e2e40bfe222011c
Arg [7] : feeReceiver_ (address): 0x75Eee167D2E5cC675f5b07f95d6A93E7088d6c34

-----Encoded View---------------
16 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000100
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000140
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000012
Arg [3] : 0000000000000000000000000000000000000000033b2e3c9fd0803ce8000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [5] : 0000000000000000000000001f4c0e6694d92c519ada067b157abea8b48ec8d0
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000180
Arg [7] : 00000000000000000000000075eee167d2e5cc675f5b07f95d6a93e7088d6c34
Arg [8] : 0000000000000000000000000000000000000000000000000000000000000016
Arg [9] : 4d756c746920556e6976657273652043656e7472616c00000000000000000000
Arg [10] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [11] : 4d55430000000000000000000000000000000000000000000000000000000000
Arg [12] : 0000000000000000000000000000000000000000000000000000000000000041
Arg [13] : 79811b677afcfd3a1a2680f84b5eb37723ae1cbd216f93c87657c0b20b1c04b7
Arg [14] : 4af01af965fd626d8634153aa905ae820268f79c878070db059e2e40bfe22201
Arg [15] : 1c00000000000000000000000000000000000000000000000000000000000000


Block Transaction Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

MUC(Multi Universe Central) is a utility token project connected to diverse decentralized IPs and contents. Based on high expandability of MUC ecosystem, MUC can collaborate with other various projects and work as a crypto economy connecting contents inwards and outwards.

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Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.