Contract 0x56f2c8353049270d3553773e680b0d6c632544b6

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0xdc60fea89054c2732eddd81b6bf73ecab4838578d27bc7335f45bbc42235f5df0x60806040157980742021-07-01 14:59:20207 days 13 hrs ago0x9a8f92a830a5cb89a3816e3d267cb7791c16b04d IN  Create: TokenFactory0 MATIC0.0590534430
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0x8e74ae16dd1b8475bca5e211653e6dd5865545e8b48e6c46df9937a89703d2c0222319042021-12-04 8:10:0151 days 20 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x8e74ae16dd1b8475bca5e211653e6dd5865545e8b48e6c46df9937a89703d2c0222319042021-12-04 8:10:0151 days 20 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
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0x6cf05553b12146737848cf106452a572939beec8542753516973195b482f28d2189360012021-09-14 23:01:34132 days 5 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
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0xde7a9b6abbc848ad35e4ee04721da77cd684c7331ae88636f771f62b29bf57b1183964782021-09-02 0:58:47145 days 3 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x694404de2725df9ecd0946a9cd56035eb19a4e5ead2fb323bc4fe93e52aa7490183964782021-09-02 0:58:47145 days 3 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x694404de2725df9ecd0946a9cd56035eb19a4e5ead2fb323bc4fe93e52aa7490183964782021-09-02 0:58:47145 days 3 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0xfab22cc2cb5a97b104c08203efbc57fce433288e76f4a5bd4e60e754f0582756183964782021-09-02 0:58:47145 days 3 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0xfab22cc2cb5a97b104c08203efbc57fce433288e76f4a5bd4e60e754f0582756183964782021-09-02 0:58:47145 days 3 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x5f5f6fd04490993a5066b00b04f0baa62267f5219105d3225026a43138800c4e181973622021-08-28 6:32:51149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x5f5f6fd04490993a5066b00b04f0baa62267f5219105d3225026a43138800c4e181973622021-08-28 6:32:51149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0xd5c832ef1b8bd617140abf20490043c202a8f348554ffc8ff9a8d7a4165da71a181973612021-08-28 6:32:49149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0xd5c832ef1b8bd617140abf20490043c202a8f348554ffc8ff9a8d7a4165da71a181973612021-08-28 6:32:49149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0xbcff6bd9549b3ffe37a5a75be472afa3a214ff0f7cc46370899f93c51643cf86181973612021-08-28 6:32:49149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0xbcff6bd9549b3ffe37a5a75be472afa3a214ff0f7cc46370899f93c51643cf86181973612021-08-28 6:32:49149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x19909b8434e781cc12b620a973ebf7d39ee9e7f38042c5000046bbe530a205fc181971012021-08-28 6:23:53149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x19909b8434e781cc12b620a973ebf7d39ee9e7f38042c5000046bbe530a205fc181971012021-08-28 6:23:53149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
0x6565d22a539bcb576dfdadbd7f78b9433fb978d784fa1343ff15ef92f738985e181971002021-08-28 6:23:51149 days 22 hrs ago 0x56f2c8353049270d3553773e680b0d6c632544b6  Contract Creation0 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
TokenFactory

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 199 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 10 : TokenFactory.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

import "./SyntheticToken.sol";
import "../../common/interfaces/ExpandedIERC20.sol";
import "../../common/implementation/Lockable.sol";

/**
 * @title Factory for creating new mintable and burnable tokens.
 */

contract TokenFactory is Lockable {
    /**
     * @notice Create a new token and return it to the caller.
     * @dev The caller will become the only minter and burner and the new owner capable of assigning the roles.
     * @param tokenName used to describe the new token.
     * @param tokenSymbol short ticker abbreviation of the name. Ideally < 5 chars.
     * @param tokenDecimals used to define the precision used in the token's numerical representation.
     * @return newToken an instance of the newly created token interface.
     */
    function createToken(
        string calldata tokenName,
        string calldata tokenSymbol,
        uint8 tokenDecimals
    ) external nonReentrant() returns (ExpandedIERC20 newToken) {
        SyntheticToken mintableToken = new SyntheticToken(tokenName, tokenSymbol, tokenDecimals);
        mintableToken.resetOwner(msg.sender);
        newToken = ExpandedIERC20(address(mintableToken));
    }
}

File 2 of 10 : SyntheticToken.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;
import "../../common/implementation/ExpandedERC20.sol";
import "../../common/implementation/Lockable.sol";

/**
 * @title Burnable and mintable ERC20.
 * @dev The contract deployer will initially be the only minter, burner and owner capable of adding new roles.
 */

contract SyntheticToken is ExpandedERC20, Lockable {
    /**
     * @notice Constructs the SyntheticToken.
     * @param tokenName The name which describes the new token.
     * @param tokenSymbol The ticker abbreviation of the name. Ideally < 5 chars.
     * @param tokenDecimals The number of decimals to define token precision.
     */
    constructor(
        string memory tokenName,
        string memory tokenSymbol,
        uint8 tokenDecimals
    ) ExpandedERC20(tokenName, tokenSymbol, tokenDecimals) nonReentrant() {}

    /**
     * @notice Add Minter role to account.
     * @dev The caller must have the Owner role.
     * @param account The address to which the Minter role is added.
     */
    function addMinter(address account) external override nonReentrant() {
        addMember(uint256(Roles.Minter), account);
    }

    /**
     * @notice Remove Minter role from account.
     * @dev The caller must have the Owner role.
     * @param account The address from which the Minter role is removed.
     */
    function removeMinter(address account) external nonReentrant() {
        removeMember(uint256(Roles.Minter), account);
    }

    /**
     * @notice Add Burner role to account.
     * @dev The caller must have the Owner role.
     * @param account The address to which the Burner role is added.
     */
    function addBurner(address account) external override nonReentrant() {
        addMember(uint256(Roles.Burner), account);
    }

    /**
     * @notice Removes Burner role from account.
     * @dev The caller must have the Owner role.
     * @param account The address from which the Burner role is removed.
     */
    function removeBurner(address account) external nonReentrant() {
        removeMember(uint256(Roles.Burner), account);
    }

    /**
     * @notice Reset Owner role to account.
     * @dev The caller must have the Owner role.
     * @param account The new holder of the Owner role.
     */
    function resetOwner(address account) external override nonReentrant() {
        resetMember(uint256(Roles.Owner), account);
    }

    /**
     * @notice Checks if a given account holds the Minter role.
     * @param account The address which is checked for the Minter role.
     * @return bool True if the provided account is a Minter.
     */
    function isMinter(address account) public view nonReentrantView() returns (bool) {
        return holdsRole(uint256(Roles.Minter), account);
    }

    /**
     * @notice Checks if a given account holds the Burner role.
     * @param account The address which is checked for the Burner role.
     * @return bool True if the provided account is a Burner.
     */
    function isBurner(address account) public view nonReentrantView() returns (bool) {
        return holdsRole(uint256(Roles.Burner), account);
    }
}

File 3 of 10 : ExpandedIERC20.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

/**
 * @title ERC20 interface that includes burn and mint methods.
 */
abstract contract ExpandedIERC20 is IERC20 {
    /**
     * @notice Burns a specific amount of the caller's tokens.
     * @dev Only burns the caller's tokens, so it is safe to leave this method permissionless.
     */
    function burn(uint256 value) external virtual;

    /**
     * @dev Burns `value` tokens owned by `recipient`.
     * @param recipient address to burn tokens from.
     * @param value amount of tokens to burn.
     */
    function burnFrom(address recipient, uint256 value) external virtual returns (bool);

    /**
     * @notice Mints tokens and adds them to the balance of the `to` address.
     * @dev This method should be permissioned to only allow designated parties to mint tokens.
     */
    function mint(address to, uint256 value) external virtual returns (bool);

    function addMinter(address account) external virtual;

    function addBurner(address account) external virtual;

    function resetOwner(address account) external virtual;
}

File 4 of 10 : Lockable.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

/**
 * @title A contract that provides modifiers to prevent reentrancy to state-changing and view-only methods. This contract
 * is inspired by https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/ReentrancyGuard.sol
 * and https://github.com/balancer-labs/balancer-core/blob/master/contracts/BPool.sol.
 */
contract Lockable {
    bool private _notEntered;

    constructor() {
        // Storing an initial 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.
        _notEntered = true;
    }

    /**
     * @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 making it call a `private`
     * function that does the actual state modification.
     */
    modifier nonReentrant() {
        _preEntranceCheck();
        _preEntranceSet();
        _;
        _postEntranceReset();
    }

    /**
     * @dev Designed to prevent a view-only method from being re-entered during a call to a `nonReentrant()` state-changing method.
     */
    modifier nonReentrantView() {
        _preEntranceCheck();
        _;
    }

    // Internal methods are used to avoid copying the require statement's bytecode to every `nonReentrant()` method.
    // On entry into a function, `_preEntranceCheck()` should always be called to check if the function is being
    // re-entered. Then, if the function modifies state, it should call `_postEntranceSet()`, perform its logic, and
    // then call `_postEntranceReset()`.
    // View-only methods can simply call `_preEntranceCheck()` to make sure that it is not being re-entered.
    function _preEntranceCheck() internal view {
        // On the first call to nonReentrant, _notEntered will be true
        require(_notEntered, "ReentrancyGuard: reentrant call");
    }

    function _preEntranceSet() internal {
        // Any calls to nonReentrant after this point will fail
        _notEntered = false;
    }

    function _postEntranceReset() internal {
        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _notEntered = true;
    }
}

File 5 of 10 : ExpandedERC20.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./MultiRole.sol";
import "../interfaces/ExpandedIERC20.sol";

/**
 * @title An ERC20 with permissioned burning and minting. The contract deployer will initially
 * be the owner who is capable of adding new roles.
 */
contract ExpandedERC20 is ExpandedIERC20, ERC20, MultiRole {
    enum Roles {
        // Can set the minter and burner.
        Owner,
        // Addresses that can mint new tokens.
        Minter,
        // Addresses that can burn tokens that address owns.
        Burner
    }

    uint8 _decimals;

    /**
     * @notice Constructs the ExpandedERC20.
     * @param _tokenName The name which describes the new token.
     * @param _tokenSymbol The ticker abbreviation of the name. Ideally < 5 chars.
     * @param _tokenDecimals The number of decimals to define token precision.
     */
    constructor(
        string memory _tokenName,
        string memory _tokenSymbol,
        uint8 _tokenDecimals
    ) ERC20(_tokenName, _tokenSymbol) {
        _decimals = _tokenDecimals;
        _createExclusiveRole(uint256(Roles.Owner), uint256(Roles.Owner), msg.sender);
        _createSharedRole(uint256(Roles.Minter), uint256(Roles.Owner), new address[](0));
        _createSharedRole(uint256(Roles.Burner), uint256(Roles.Owner), new address[](0));
    }

    function decimals() public view virtual override(ERC20) returns (uint8) {
        return _decimals;
    }

    /**
     * @dev Mints `value` tokens to `recipient`, returning true on success.
     * @param recipient address to mint to.
     * @param value amount of tokens to mint.
     * @return True if the mint succeeded, or False.
     */
    function mint(address recipient, uint256 value)
        external
        override
        onlyRoleHolder(uint256(Roles.Minter))
        returns (bool)
    {
        _mint(recipient, value);
        return true;
    }

    /**
     * @dev Burns `value` tokens owned by `msg.sender`.
     * @param value amount of tokens to burn.
     */
    function burn(uint256 value) external override onlyRoleHolder(uint256(Roles.Burner)) {
        _burn(msg.sender, value);
    }

    /**
     * @dev Burns `value` tokens owned by `recipient`.
     * @param recipient address to burn tokens from.
     * @param value amount of tokens to burn.
     * @return True if the burn succeeded, or False.
     */
    function burnFrom(address recipient, uint256 value)
        external
        override
        onlyRoleHolder(uint256(Roles.Burner))
        returns (bool)
    {
        _burn(recipient, value);
        return true;
    }

    /**
     * @notice Add Minter role to account.
     * @dev The caller must have the Owner role.
     * @param account The address to which the Minter role is added.
     */
    function addMinter(address account) external virtual override {
        addMember(uint256(Roles.Minter), account);
    }

    /**
     * @notice Add Burner role to account.
     * @dev The caller must have the Owner role.
     * @param account The address to which the Burner role is added.
     */
    function addBurner(address account) external virtual override {
        addMember(uint256(Roles.Burner), account);
    }

    /**
     * @notice Reset Owner role to account.
     * @dev The caller must have the Owner role.
     * @param account The new holder of the Owner role.
     */
    function resetOwner(address account) external virtual override {
        resetMember(uint256(Roles.Owner), account);
    }
}

File 6 of 10 : 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 defaut 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");
        _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");
        _approve(_msgSender(), spender, currentAllowance - subtractedValue);

        return true;
    }

    /**
     * @dev Moves tokens `amount` from `sender` to `recipient`.
     *
     * This is internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `sender` cannot be the zero address.
     * - `recipient` cannot be the zero address.
     * - `sender` must have a balance of at least `amount`.
     */
    function _transfer(address sender, address recipient, uint256 amount) internal 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");
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;

        emit Transfer(sender, recipient, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal 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);
    }

    /**
     * @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");
        _balances[account] = accountBalance - amount;
        _totalSupply -= amount;

        emit Transfer(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 to 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 { }
}

File 7 of 10 : MultiRole.sol
// SPDX-License-Identifier: AGPL-3.0-only
pragma solidity ^0.8.0;

library Exclusive {
    struct RoleMembership {
        address member;
    }

    function isMember(RoleMembership storage roleMembership, address memberToCheck) internal view returns (bool) {
        return roleMembership.member == memberToCheck;
    }

    function resetMember(RoleMembership storage roleMembership, address newMember) internal {
        require(newMember != address(0x0), "Cannot set an exclusive role to 0x0");
        roleMembership.member = newMember;
    }

    function getMember(RoleMembership storage roleMembership) internal view returns (address) {
        return roleMembership.member;
    }

    function init(RoleMembership storage roleMembership, address initialMember) internal {
        resetMember(roleMembership, initialMember);
    }
}

library Shared {
    struct RoleMembership {
        mapping(address => bool) members;
    }

    function isMember(RoleMembership storage roleMembership, address memberToCheck) internal view returns (bool) {
        return roleMembership.members[memberToCheck];
    }

    function addMember(RoleMembership storage roleMembership, address memberToAdd) internal {
        require(memberToAdd != address(0x0), "Cannot add 0x0 to a shared role");
        roleMembership.members[memberToAdd] = true;
    }

    function removeMember(RoleMembership storage roleMembership, address memberToRemove) internal {
        roleMembership.members[memberToRemove] = false;
    }

    function init(RoleMembership storage roleMembership, address[] memory initialMembers) internal {
        for (uint256 i = 0; i < initialMembers.length; i++) {
            addMember(roleMembership, initialMembers[i]);
        }
    }
}

/**
 * @title Base class to manage permissions for the derived class.
 */
abstract contract MultiRole {
    using Exclusive for Exclusive.RoleMembership;
    using Shared for Shared.RoleMembership;

    enum RoleType { Invalid, Exclusive, Shared }

    struct Role {
        uint256 managingRole;
        RoleType roleType;
        Exclusive.RoleMembership exclusiveRoleMembership;
        Shared.RoleMembership sharedRoleMembership;
    }

    mapping(uint256 => Role) private roles;

    event ResetExclusiveMember(uint256 indexed roleId, address indexed newMember, address indexed manager);
    event AddedSharedMember(uint256 indexed roleId, address indexed newMember, address indexed manager);
    event RemovedSharedMember(uint256 indexed roleId, address indexed oldMember, address indexed manager);

    /**
     * @notice Reverts unless the caller is a member of the specified roleId.
     */
    modifier onlyRoleHolder(uint256 roleId) {
        require(holdsRole(roleId, msg.sender), "Sender does not hold required role");
        _;
    }

    /**
     * @notice Reverts unless the caller is a member of the manager role for the specified roleId.
     */
    modifier onlyRoleManager(uint256 roleId) {
        require(holdsRole(roles[roleId].managingRole, msg.sender), "Can only be called by a role manager");
        _;
    }

    /**
     * @notice Reverts unless the roleId represents an initialized, exclusive roleId.
     */
    modifier onlyExclusive(uint256 roleId) {
        require(roles[roleId].roleType == RoleType.Exclusive, "Must be called on an initialized Exclusive role");
        _;
    }

    /**
     * @notice Reverts unless the roleId represents an initialized, shared roleId.
     */
    modifier onlyShared(uint256 roleId) {
        require(roles[roleId].roleType == RoleType.Shared, "Must be called on an initialized Shared role");
        _;
    }

    /**
     * @notice Whether `memberToCheck` is a member of roleId.
     * @dev Reverts if roleId does not correspond to an initialized role.
     * @param roleId the Role to check.
     * @param memberToCheck the address to check.
     * @return True if `memberToCheck` is a member of `roleId`.
     */
    function holdsRole(uint256 roleId, address memberToCheck) public view returns (bool) {
        Role storage role = roles[roleId];
        if (role.roleType == RoleType.Exclusive) {
            return role.exclusiveRoleMembership.isMember(memberToCheck);
        } else if (role.roleType == RoleType.Shared) {
            return role.sharedRoleMembership.isMember(memberToCheck);
        }
        revert("Invalid roleId");
    }

    /**
     * @notice Changes the exclusive role holder of `roleId` to `newMember`.
     * @dev Reverts if the caller is not a member of the managing role for `roleId` or if `roleId` is not an
     * initialized, ExclusiveRole.
     * @param roleId the ExclusiveRole membership to modify.
     * @param newMember the new ExclusiveRole member.
     */
    function resetMember(uint256 roleId, address newMember) public onlyExclusive(roleId) onlyRoleManager(roleId) {
        roles[roleId].exclusiveRoleMembership.resetMember(newMember);
        emit ResetExclusiveMember(roleId, newMember, msg.sender);
    }

    /**
     * @notice Gets the current holder of the exclusive role, `roleId`.
     * @dev Reverts if `roleId` does not represent an initialized, exclusive role.
     * @param roleId the ExclusiveRole membership to check.
     * @return the address of the current ExclusiveRole member.
     */
    function getMember(uint256 roleId) public view onlyExclusive(roleId) returns (address) {
        return roles[roleId].exclusiveRoleMembership.getMember();
    }

    /**
     * @notice Adds `newMember` to the shared role, `roleId`.
     * @dev Reverts if `roleId` does not represent an initialized, SharedRole or if the caller is not a member of the
     * managing role for `roleId`.
     * @param roleId the SharedRole membership to modify.
     * @param newMember the new SharedRole member.
     */
    function addMember(uint256 roleId, address newMember) public onlyShared(roleId) onlyRoleManager(roleId) {
        roles[roleId].sharedRoleMembership.addMember(newMember);
        emit AddedSharedMember(roleId, newMember, msg.sender);
    }

    /**
     * @notice Removes `memberToRemove` from the shared role, `roleId`.
     * @dev Reverts if `roleId` does not represent an initialized, SharedRole or if the caller is not a member of the
     * managing role for `roleId`.
     * @param roleId the SharedRole membership to modify.
     * @param memberToRemove the current SharedRole member to remove.
     */
    function removeMember(uint256 roleId, address memberToRemove) public onlyShared(roleId) onlyRoleManager(roleId) {
        roles[roleId].sharedRoleMembership.removeMember(memberToRemove);
        emit RemovedSharedMember(roleId, memberToRemove, msg.sender);
    }

    /**
     * @notice Removes caller from the role, `roleId`.
     * @dev Reverts if the caller is not a member of the role for `roleId` or if `roleId` is not an
     * initialized, SharedRole.
     * @param roleId the SharedRole membership to modify.
     */
    function renounceMembership(uint256 roleId) public onlyShared(roleId) onlyRoleHolder(roleId) {
        roles[roleId].sharedRoleMembership.removeMember(msg.sender);
        emit RemovedSharedMember(roleId, msg.sender, msg.sender);
    }

    /**
     * @notice Reverts if `roleId` is not initialized.
     */
    modifier onlyValidRole(uint256 roleId) {
        require(roles[roleId].roleType != RoleType.Invalid, "Attempted to use an invalid roleId");
        _;
    }

    /**
     * @notice Reverts if `roleId` is initialized.
     */
    modifier onlyInvalidRole(uint256 roleId) {
        require(roles[roleId].roleType == RoleType.Invalid, "Cannot use a pre-existing role");
        _;
    }

    /**
     * @notice Internal method to initialize a shared role, `roleId`, which will be managed by `managingRoleId`.
     * `initialMembers` will be immediately added to the role.
     * @dev Should be called by derived contracts, usually at construction time. Will revert if the role is already
     * initialized.
     */
    function _createSharedRole(
        uint256 roleId,
        uint256 managingRoleId,
        address[] memory initialMembers
    ) internal onlyInvalidRole(roleId) {
        Role storage role = roles[roleId];
        role.roleType = RoleType.Shared;
        role.managingRole = managingRoleId;
        role.sharedRoleMembership.init(initialMembers);
        require(
            roles[managingRoleId].roleType != RoleType.Invalid,
            "Attempted to use an invalid role to manage a shared role"
        );
    }

    /**
     * @notice Internal method to initialize an exclusive role, `roleId`, which will be managed by `managingRoleId`.
     * `initialMember` will be immediately added to the role.
     * @dev Should be called by derived contracts, usually at construction time. Will revert if the role is already
     * initialized.
     */
    function _createExclusiveRole(
        uint256 roleId,
        uint256 managingRoleId,
        address initialMember
    ) internal onlyInvalidRole(roleId) {
        Role storage role = roles[roleId];
        role.roleType = RoleType.Exclusive;
        role.managingRole = managingRoleId;
        role.exclusiveRoleMembership.init(initialMember);
        require(
            roles[managingRoleId].roleType != RoleType.Invalid,
            "Attempted to use an invalid role to manage an exclusive role"
        );
    }
}

File 8 of 10 : 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 9 of 10 : 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 10 of 10 : 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) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 199
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

Contract ABI

[{"inputs":[{"internalType":"string","name":"tokenName","type":"string"},{"internalType":"string","name":"tokenSymbol","type":"string"},{"internalType":"uint8","name":"tokenDecimals","type":"uint8"}],"name":"createToken","outputs":[{"internalType":"contract ExpandedIERC20","name":"newToken","type":"address"}],"stateMutability":"nonpayable","type":"function"}]

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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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