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0x8cC379A292a47Cb8406Fb1bd8a6D98f442275f0e
 

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Uranium3o8 (U) (@$49.5614)

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Approve193211252024-02-27 19:58:231 day 8 hrs ago1709063903IN
Uranium3o8: U Token
0 ETH0.002618856.22042089
Approve193084862024-02-26 1:31:593 days 3 hrs ago1708911119IN
Uranium3o8: U Token
0 ETH0.0014020230.05985854
Approve193075822024-02-25 22:29:473 days 6 hrs ago1708900187IN
Uranium3o8: U Token
0 ETH0.0016148334.66727345
Approve193069742024-02-25 20:26:473 days 8 hrs ago1708892807IN
Uranium3o8: U Token
0 ETH0.0011336938.77067308
Approve192780702024-02-21 19:19:597 days 9 hrs ago1708543199IN
Uranium3o8: U Token
0 ETH0.0014587131.47792017
Approve192693572024-02-20 13:58:358 days 14 hrs ago1708437515IN
Uranium3o8: U Token
0 ETH0.0022376548.03795654
Approve192673392024-02-20 7:09:238 days 21 hrs ago1708412963IN
Uranium3o8: U Token
0 ETH0.0009050819.5208829
Approve192600672024-02-19 6:41:239 days 22 hrs ago1708324883IN
Uranium3o8: U Token
0 ETH0.0006312425.98036236
Approve192426262024-02-16 19:47:1112 days 9 hrs ago1708112831IN
Uranium3o8: U Token
0 ETH0.0009668320.88514154
Approve192424172024-02-16 19:05:1112 days 9 hrs ago1708110311IN
Uranium3o8: U Token
0 ETH0.0014550631.23737641
Approve192409492024-02-16 14:08:3512 days 14 hrs ago1708092515IN
Uranium3o8: U Token
0 ETH0.0022903849.48874651
Transfer192347672024-02-15 17:17:4713 days 11 hrs ago1708017467IN
Uranium3o8: U Token
0 ETH0.0025014143.07064996
Approve192261322024-02-14 12:12:4714 days 16 hrs ago1707912767IN
Uranium3o8: U Token
0 ETH0.0006670425.00068489
Approve192261122024-02-14 12:08:4714 days 16 hrs ago1707912527IN
Uranium3o8: U Token
0 ETH0.0009065519.46188351
Approve192135922024-02-12 18:00:2316 days 10 hrs ago1707760823IN
Uranium3o8: U Token
0 ETH0.0025467455.01371335
Approve192008712024-02-10 23:09:1118 days 5 hrs ago1707606551IN
Uranium3o8: U Token
0 ETH0.0006735627.65393705
Approve192008512024-02-10 23:05:1118 days 5 hrs ago1707606311IN
Uranium3o8: U Token
0 ETH0.0013855129.70589891
Approve191978622024-02-10 12:59:3518 days 15 hrs ago1707569975IN
Uranium3o8: U Token
0 ETH0.0016506735.43661568
Approve191738152024-02-07 4:02:5922 days 54 mins ago1707278579IN
Uranium3o8: U Token
0 ETH0.0012129826.20907367
Approve191561332024-02-04 16:28:1124 days 12 hrs ago1707064091IN
Uranium3o8: U Token
0 ETH0.0011801725.30335807
Approve191558552024-02-04 15:31:5924 days 13 hrs ago1707060719IN
Uranium3o8: U Token
0 ETH0.0008440818.23355092
Approve191298082024-01-31 23:43:4728 days 5 hrs ago1706744627IN
Uranium3o8: U Token
0 ETH0.0010287122.05593352
Approve191280132024-01-31 17:41:5928 days 11 hrs ago1706722919IN
Uranium3o8: U Token
0 ETH0.0011373124.41576366
Approve191264482024-01-31 12:25:2328 days 16 hrs ago1706703923IN
Uranium3o8: U Token
0 ETH0.0011468624.58910816
Approve191244622024-01-31 5:43:3528 days 23 hrs ago1706679815IN
Uranium3o8: U Token
0 ETH0.0008485718.2171143
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Contract Source Code Verified (Exact Match)

Contract Name:
Uranium3o8

Compiler Version
v0.8.21+commit.d9974bed

Optimization Enabled:
Yes with 200 runs

Other Settings:
paris EvmVersion
File 1 of 16 : Uranium3o8.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import {IERC20} from "../lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
import {ERC20} from "../lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol";
import {Pausable} from "./Pausable.sol";
import {Blacklistable} from "./Blacklistable.sol";
import {ReentrancyGuard} from "../lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol";
import {Rescuable} from "./Rescuable.sol";
import {SafeERC20} from "../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @title Uranium3o8 Token
 * @dev ERC20 token with pausable, blacklistable, and rescuable features.
 * @notice Major powers are separated amongst the roles in the Uranium3o8 token
 *
 * Owner: Can change ownership and update contract roles.
 *   Power: can transfer Ownership, update Pauser, Rescuer, Blacklister, and MasterMinter.
 *
 * Pauser: Can pause and unpause the contract.
 *   Power: Pause and Unpause. Pausing restricts all non-view functions in the Uranium3o8 contract.
 *
 * Rescuer: Can rescue ERC20 tokens accidentally sent to the contract.
 *   Power: Rescue Funds. 
            Rescue rights not affected by pauses.
 *
 * Blacklister: Can manage the blacklist and restrict certain functions.
 *   Power: Add to and Remove from Blacklist.
 *          Blacklisted addresses face restricted functionalities.
 *          Blacklisting rights are not affected by pauses.
 *
 * Master Minter: Controls minting-related operations and configuration.
 *   Power: Issue and Redeem tokens. Configure and manage minters.
 *   The Master minter has the exclusive authority to add, update, and remove minters.
 *   Constraint: Minting and burning can only be performed by the masterMinter. 
 *   Minters' operations are subject to the allowance set by the masterMinter.
 */

contract Uranium3o8 is
    Pausable,
    Blacklistable,
    Rescuable,
    ReentrancyGuard,
    ERC20
{
    constructor() ERC20("Uranium3o8", "U") {
        masterMinter = address(msg.sender);
    }

    uint256 public maxMinterNumber;

    address public masterMinter;
    /** @notice array of all minter address */
    address[] public minterAddresses;
    /** @notice mapping to check if a given address is a minter */
    mapping(address => bool) public minters;
    /** @notice mapping of minter to its allowance */
    mapping(address => uint256) public minterAllowance;
    /** @notice mapping of minter to allowance already used */
    mapping(address => uint256) public minterUsedAllowance;

    event Issued(uint256 amount);
    event Redeemed(uint256 amount);
    event MintedByMinter(uint256 amount, uint256 usedAllowance, address minter);
    event BurnedByMinter(uint256 amount, uint256 usedAllowance, address minter);
    event MasterMinterChanged(address indexed newMasterMinter);
    event MinterConfigured(
        address indexed minter,
        uint256 minterAllowanceAmount
    );
    event MinterRemoved(address minter);
    event DestroyedBlackFunds(
        address indexed blackListedUser,
        uint256 dirtyFunds
    );
    event MaximumNumberOfMinters(uint256 newMinterNumber);

    /**
     * @dev Throws if called by any account other than a minter
     */
    modifier onlyMinters() {
        require(minters[msg.sender], "Uranium3o8: caller is not a minter");
        _;
    }

    /**
     * @dev Throws if called by any account other than the masterMinter
     */
    modifier onlyMasterMinter() {
        require(
            msg.sender == masterMinter,
            "Uranium3o8: caller is not the masterMinter"
        );
        _;
    }

    /**
     @dev checks if it is on the minterAddresses array
     * We iterate over the dynamic array and not the mapping because 
     * this is the most informationally dense structure where data on minters is stored. 
     */

    function isMinter(address minter) public view returns (bool) {
        // for (uint i = 0; i < minterAddresses.length; i++) {
        //     if (minterAddresses[i] == minter) {
        //         return true;
        //     }
        // }
        // return false;
        bool _is = minters[minter];
        return _is;
    }

    function allMinters() public view returns (address[] memory) {
        return minterAddresses;
    }

    function numberOfMinters() public view returns (uint256 mintersNumber) {
        address[] memory _minterAddresses = allMinters();
        mintersNumber = _minterAddresses.length;
        return mintersNumber;
    }

    function transfer(
        address _to,
        uint256 _value
    )
        public
        override
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(_to)
        returns (bool)
    {
        return super.transfer(_to, _value);
    }

    function transferFrom(
        address _from,
        address _to,
        uint256 _value
    )
        public
        override
        whenNotPaused
        notBlacklisted(_from)
        notBlacklisted(_to)
        returns (bool)
    {
        return super.transferFrom(_from, _to, _value);
    }

    /** @dev Issues a new amount of tokens.
     * These tokens are deposted into the owner address.
     * Only the masterMinter call this function.
     * Issue amount is unlimited.
     */

    function issue(
        uint256 amount
    )
        external
        nonReentrant
        onlyMasterMinter
        whenNotPaused
        notBlacklisted(msg.sender)
    {
        _mint(masterMinter, amount);
        emit Issued(amount);
    }

    /** @dev Redeems an amount of tokens.
     * These tokens are withdrawn from the owner address,
     * which means the tokens must be deposited from the owner address before hand.
     * Only the masterMinter call this function.
     * The redemption amount must be covered by the balance in the owern address
     * or the call will fail.
     */

    function redeem(
        uint256 amount
    )
        external
        nonReentrant
        onlyMasterMinter
        whenNotPaused
        notBlacklisted(msg.sender)
    {
        _burn(masterMinter, amount);
        emit Redeemed(amount);
    }

    /**
     * @notice Mint new tokens by an authorized minter.
     * MasterMinter may not call this function as masterMinter cannot be added to the list of minters
     * @param to Recipient address for minted tokens.
     * @param amount Amount of tokens to mint.
     * Requirements: Authorized minter, contract not paused, recipient not blacklisting.
     * Emits a MintedByMinter event.
     */
    function mintByMinter(
        address to,
        uint256 amount
    )
        external
        nonReentrant
        onlyMinters
        whenNotPaused
        notBlacklisted(msg.sender)
        notBlacklisted(to)
    {
        uint256 allowance = minterAllowance[msg.sender];
        uint256 usedAllowance = minterUsedAllowance[msg.sender];
        require(usedAllowance + amount <= allowance, "Insufficient allowance");

        _mint(to, amount);
        minterUsedAllowance[msg.sender] += amount;
        emit MintedByMinter(amount, minterUsedAllowance[msg.sender], to);
    }

    /**
     * @notice Redeems tokens by an authorized minter.
     * MasterMinter may not call this function as masterMinter cannot be added to the list of minters
     * @param amount Amount of tokens to be redeemed.
     * Requirements: Authorized minter, contract not paused, recipient not blacklisting.
     * Emits a BurnedByMinter event.
     */

    function burnByMinter(
        uint256 amount
    )
        external
        nonReentrant
        onlyMinters
        whenNotPaused
        notBlacklisted(msg.sender)
    {
        uint256 usedAllowance = minterUsedAllowance[msg.sender];
        /** the minter can't burn if it has not used any of its allowance. */
        require(usedAllowance > 0, "minter has not used any of its allowance");
        /** The following basically means if a minter burns more than its usedAllownace,
         * there will be tokens left unburned,
         * and some other minter will have to burn it.
         */
        bool burningMoreThanUsedAllowance = (usedAllowance < amount);
        uint256 burningAmount = (
            burningMoreThanUsedAllowance ? usedAllowance : amount
        );
        minterUsedAllowance[msg.sender] -= burningAmount;
        _burn(msg.sender, burningAmount);
        emit BurnedByMinter(burningAmount, usedAllowance, msg.sender);
    }

    /**
     * @dev Updates the address of the masterMinter role.
     * Only the contract owner can update the masterMinter address.
     * @param _newMasterMinter The new address to be set as the masterMinter.
     * The new address cannot be the zero address and must not be blacklisted.
     * Emits a MasterMinterChanged event.
     */
    function updateMasterMinter(
        address _newMasterMinter
    )
        external
        nonReentrant
        whenNotPaused
        onlyOwner
        notBlacklisted(_newMasterMinter)
    {
        require(
            _newMasterMinter != address(0),
            "Uranium3o8: new masterMinter is the zero address"
        );
        masterMinter = _newMasterMinter;
        emit MasterMinterChanged(masterMinter);
    }

    /**
     * @dev Function to add a new minter or to update the allowance of a minter
     * @param minter The address of the minter
     * @param newMinterAllowanceAmount The minting amount allowed for the minter
     * @return True if the operation was successful.
     */
    function configureMinter(
        address minter,
        uint256 newMinterAllowanceAmount
    ) external nonReentrant whenNotPaused onlyMasterMinter returns (bool) {
        require(minter != masterMinter, "Trying to add masterMinter");
        require(
            minter != address(0),
            "Trying to add the zero address as minter!"
        );
        bool _alreadyIsMinter = isMinter(minter);
        if (!_alreadyIsMinter) {
            require(
                numberOfMinters() + 1 <= maxMinterNumber,
                "maximum number of minters reached"
            );
        }
        /** If the masterMinter reconfigures the minter's allowance
         * to something lower than the allowance it has already used,
         * the minter's usedAllowance will be reset to the new allowance,
         * which effectively means the minter will not be able to mint anymore.
         */
        uint256 oldMinterAllowanceAmount = minterAllowance[minter];
        uint256 usedAllowance = minterUsedAllowance[minter];
        if (
            newMinterAllowanceAmount <= oldMinterAllowanceAmount &&
            usedAllowance >= newMinterAllowanceAmount
        ) {
            minterUsedAllowance[minter] = newMinterAllowanceAmount;
        }

        minterAllowance[minter] = newMinterAllowanceAmount;
        if (!_alreadyIsMinter) {
            minterAddresses.push(minter);
            minters[minter] = true;
            assert(numberOfMinters() <= maxMinterNumber);
        }
        emit MinterConfigured(minter, newMinterAllowanceAmount);
        return true;
    }

    /**
     * @dev Removes a minter from the list of authorized minters.
     * Only the masterMinter can call this function to remove a minter.
     * @param minter The address of the minter to be removed.
     * @return A boolean indicating the success of the operation.
     * Requirements: Caller must be the masterMinter, contract not paused,
     * the minter address cannot be the zero address, and the minter cannot be the contract owner.
     * Emits a MinterRemoved event.
     */
    function removeMinter(
        address minter
    ) external nonReentrant whenNotPaused onlyMasterMinter returns (bool) {
        require(minter != address(0), "Zero address!");
        require(isMinter(minter), "Address not on list of minter addresses!");
        // deleting value from mapping
        delete minters[minter];
        delete minterAllowance[minter];
        delete minterUsedAllowance[minter];

        // Find and remove the minter from the list of minter addresses
        for (uint256 i = 0; i < minterAddresses.length; i++) {
            // if the programme finds a slot in the array whose entry is the minter
            // it replaces it with the last element in the array
            if (minterAddresses[i] == minter) {
                minterAddresses[i] = minterAddresses[
                    minterAddresses.length - 1
                ];
                minterAddresses.pop();
                break;
            }
        }
        emit MinterRemoved(minter);
        return true;
    }

    /** @dev called by owner to configure the maximum number of minters
     * Not in the hands of the masterMinter to separate powers.
     */
    function setMaximumNumberOfMinters(
        uint256 minterNumber
    ) external onlyOwner {
        maxMinterNumber = minterNumber;
        emit MaximumNumberOfMinters(minterNumber);
    }

    /**
     * @dev this function destroys the balance of a blacklisted address.
     * The function is callable only by the masterMinter and not the blacklister.
     * This is to concentrate the rights concerning supply change in the hands of the masterMinter.
     * And to deprive the blacklister of independent and unchecked fund destruction powers.
     */
    function destroyBlackFunds(
        address _blackListedUser
    ) external nonReentrant onlyMasterMinter {
        require(isBlacklisted[_blackListedUser], "user is not blacklisted!");
        uint256 dirtyFunds = balanceOf(_blackListedUser);
        _burn(_blackListedUser, dirtyFunds);
        emit DestroyedBlackFunds(_blackListedUser, dirtyFunds);
    }
}

File 2 of 16 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

File 3 of 16 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

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.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 4 of 16 : Pausable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/** @dev This is based on OpenZeppelin's Pausable.
 * Unfortunately it's only last updated v4.7.0 (security/Pausable.sol).
 * So we have to manually update the contract ourselves.
 */

// import {Ownable} from "../lib/openzeppelin-contracts/contracts/access/Ownable.sol";
import {UnrenounceableOwnable2Step} from "./UnrenounceableOwnable2Step.sol";

/**
 * @dev A contract module enabling an authorized account to pause and unpause functionality.
 *
 * This module provides the `whenNotPaused` and `whenPaused` modifiers for functions.
 * The whenNotPaused modifier is used for normal functions of an ERC20 token - transfer(), transferFrom() but also other
 * functions such as issue() and redeem().
 * The function of introducing these modifiers in the contract, is to pause all activity in the situation where something has gone wrong.
 */
// contract Pausable is Ownable {
contract Pausable is UnrenounceableOwnable2Step {
    address public pauser;
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    /**
     * @dev Emitted when the pauser address is updated.
     * @param newAddress The new address assigned as the pauser.
     */
    event PauserChanged(address indexed newAddress);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
        pauser = msg.sender;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     * Requirements:
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     * Requirements:
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     * Requirements:
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     * Requirements:
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

    /**
     * @dev throws if called by any account other than the pauser
     */
    modifier onlyPauser() {
        require(msg.sender == pauser, "Pausable: caller is not the pauser");
        _;
    }

    // Pausing

    function pause() public onlyPauser returns (bool) {
        _pause();
        return (paused());
    }

    function unpause() public onlyPauser returns (bool) {
        _unpause();
        return (paused());
    }

    /**
     * @dev update the pauser role - only the owner can call this function
     * Requirements:
     * - The newPauser must not be the zero address.
     */
    function updatePauser(address _newPauser) external onlyOwner {
        require(
            _newPauser != address(0),
            "Pausable: new pauser is the zero address"
        );
        pauser = _newPauser;
        emit PauserChanged(pauser);
    }
}

File 5 of 16 : Blacklistable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import {ERC20} from "../lib/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol";
// import {Ownable} from "../lib/openzeppelin-contracts/contracts/access/Ownable.sol";
import {UnrenounceableOwnable2Step} from "./UnrenounceableOwnable2Step.sol";

/**
 * @title Blacklistable Contract
 * @dev This contract provides functionality to manage a blacklist of addresses and control access to blacklisting operations.
 */

// contract Blacklistable is Ownable {
contract Blacklistable is UnrenounceableOwnable2Step {
    mapping(address => bool) public isBlacklisted;
    address public blacklister;

    event AddedBlackList(address indexed evilUser);
    event RemovedBlackList(address indexed clearedUser);
    event BlacklisterChanged(address indexed newBlacklister);

    /**
     * @dev Initializes the contract with the deployer's address as the initial blacklister.
     */
    constructor() {
        blacklister = msg.sender;
    }

    /**
     * @dev Reverts if called by any account other than the blacklister
     */
    modifier onlyBlacklister() {
        require(
            msg.sender == blacklister,
            "Blacklistable: caller is not the blacklister"
        );
        _;
    }

    /**
     * @dev Throws if argument account is blacklisted
     * @param _account The address to check
     */
    modifier notBlacklisted(address _account) {
        require(
            !isBlacklisted[_account],
            "Blacklistable: account is blacklisted"
        );
        _;
    }

    /**
     * @dev Blacklists an address.
     * @param _evilUser Address to blacklist.
     * Emits `AddedBlackList` event.
     */
    function addBlacklist(address _evilUser) external onlyBlacklister {
        isBlacklisted[_evilUser] = true;
        emit AddedBlackList(_evilUser);
    }

    /**
     * @dev Removes an address from the blacklist.
     * @param _clearedUser Address to unblacklist.
     * Emits `RemovedBlackList` event.
     */
    function removeBlackList(address _clearedUser) external onlyBlacklister {
        isBlacklisted[_clearedUser] = false;
        emit RemovedBlackList(_clearedUser);
    }

    /**
     * @dev Updates the blacklister address. Only the owner can change the blacklister.
     * @param _newBlacklister New blacklister's address.
     * Requires non-zero address.
     * Emits `BlacklisterChanged` event.
     */
    function updateBlacklister(address _newBlacklister) external onlyOwner {
        require(
            _newBlacklister != address(0),
            "Blacklistable: new blacklister is the zero address"
        );
        blacklister = _newBlacklister;
        emit BlacklisterChanged(blacklister);
    }

    /**
     * @dev Checks if an address is blacklisted.
     */
    function getBlackListStatus(address _maker) public view returns (bool) {
        return isBlacklisted[_maker];
    }
}

File 6 of 16 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == _ENTERED;
    }
}

File 7 of 16 : Rescuable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import {IERC20} from "../lib/openzeppelin-contracts/contracts/interfaces/IERC20.sol";
// import {Ownable} from "../lib/openzeppelin-contracts/contracts/access/Ownable.sol";
import {UnrenounceableOwnable2Step} from "./UnrenounceableOwnable2Step.sol";
import {SafeERC20} from "../lib/openzeppelin-contracts/contracts/token/ERC20/utils/SafeERC20.sol";

contract Rescuable is UnrenounceableOwnable2Step {
    using SafeERC20 for IERC20;

    address public rescuer;

    event RescuerChanged(address indexed newRescuer);

    /**
     * @notice Revert if called by any account other than the rescuer.
     */
    modifier onlyRescuer() {
        require(msg.sender == rescuer, "Rescuable: caller is not the rescuer");
        _;
    }

    constructor() {
        rescuer = msg.sender;
    }

    /**
     * @notice Rescue ERC20 tokens locked up in this contract.
     * @param tokenContract ERC20 token contract address
     * @param to        Recipient address
     * @param amount    Amount to withdraw
     */
    function rescueERC20(
        address tokenContract,
        address to,
        uint256 amount
    ) external onlyRescuer {
        IERC20(tokenContract).transfer(to, amount);
    }

    /**
     * @notice Assign the rescuer role to a given address.
     * @param newRescuer New rescuer's address
     */
    function updateRescuer(address newRescuer) external onlyOwner {
        require(
            newRescuer != address(0),
            "Rescuable: new rescuer is the zero address"
        );
        rescuer = newRescuer;
        emit RescuerChanged(newRescuer);
    }
}

File 8 of 16 : SafeERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";
import "../extensions/IERC20Permit.sol";
import "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    /**
     * @dev Deprecated. This function has issues similar to the ones found in
     * {IERC20-approve}, and its usage is discouraged.
     *
     * Whenever possible, use {safeIncreaseAllowance} and
     * {safeDecreaseAllowance} instead.
     */
    function safeApprove(IERC20 token, address spender, uint256 value) internal {
        // safeApprove should only be called when setting an initial allowance,
        // or when resetting it to zero. To increase and decrease it, use
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'
        require(
            (value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance + value));
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        unchecked {
            uint256 oldAllowance = token.allowance(address(this), spender);
            require(oldAllowance >= value, "SafeERC20: decreased allowance below zero");
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, oldAllowance - value));
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Compatible with tokens that require the approval to be set to
     * 0 before setting it to a non-zero value.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeWithSelector(token.approve.selector, spender, value);

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, 0));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Use a ERC-2612 signature to set the `owner` approval toward `spender` on `token`.
     * Revert on invalid signature.
     */
    function safePermit(
        IERC20Permit token,
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal {
        uint256 nonceBefore = token.nonces(owner);
        token.permit(owner, spender, value, deadline, v, r, s);
        uint256 nonceAfter = token.nonces(owner);
        require(nonceAfter == nonceBefore + 1, "SafeERC20: permit did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed");
        require(returndata.length == 0 || abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return
            success && (returndata.length == 0 || abi.decode(returndata, (bool))) && Address.isContract(address(token));
    }
}

File 9 of 16 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (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 10 of 16 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

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 11 of 16 : Context.sol
// SPDX-License-Identifier: MIT
// 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 12 of 16 : UnrenounceableOwnable2Step.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import {Ownable2Step} from "../lib/openzeppelin-contracts/contracts/access/Ownable2Step.sol";

contract UnrenounceableOwnable2Step is Ownable2Step {
    function renounceOwnership() public view override onlyOwner {
        revert("UnrenounceableOwnable2Step: renounceOwnership is disabled");
    }
}

File 13 of 16 : IERC20Permit.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

File 14 of 16 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.0/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

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

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

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

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

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

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

File 15 of 16 : Ownable2Step.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.sol";

/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2Step is Ownable {
    address private _pendingOwner;

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

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

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

File 16 of 16 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

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

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

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

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

Settings
{
  "remappings": [
    "@prb-test/=lib/prb-test/src/",
    "@prb/test/=lib/prb-math/lib/prb-test/src/",
    "@uniswap/v2-periphery/=lib/pizza/lib/v2-periphery/contracts/",
    "chainlink/=lib/chainlink/",
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts/contracts/",
    "pizza-oracles/=lib/pizza-oracles/src/",
    "pizza/=lib/pizza/",
    "prb-math/=lib/prb-math/src/",
    "prb-test/=lib/prb-test/src/",
    "pyth-sdk-solidity/=lib/pizza/lib/pyth-sdk-solidity/",
    "solidity-lib/=lib/pizza/lib/solidity-lib/contracts/",
    "v2-core/=lib/pizza/lib/v2-core/contracts/",
    "v2-periphery/=lib/pizza/lib/v2-periphery/contracts/",
    "@uniswap/lib/=lib/uranium-token/lib/solidity-lib/",
    "@uniswap/v2-core/=lib/uranium-token/lib/v2-core/",
    "uranium-oracles/=lib/uranium-oracles/src/",
    "uranium-token/=lib/uranium-token/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

Contract Security Audit

Contract ABI

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OVERVIEW

$U, a digital token backed by physical uranium, grants unprecedented access to direct ownership of uranium, an increasingly valuable energy resource in a net zero-carbon future.

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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.