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• interface ArbitrumEnabledToken
•    - function isArbitrumEnabled()
• interface ICustomToken is ArbitrumEna ...
•    - function registerTokenOnL2(
•    - function transferFrom(
•    - function balanceOf(address account)
• interface L1MintableToken is ICustomT ...
•    - function bridgeMint(address account, ...
• interface L1ReverseToken is L1Mintabl ...
•    - function bridgeBurn(address account, ...
• interface IERC20Errors
• interface IERC721Errors
• interface IERC1155Errors
•    - function _msgSender()
•    - function _msgData()
•    - function _contextSuffixLength()
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address to, uint256 ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
• interface IERC20Metadata is IERC20
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address to, uint256 ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
•    - function _transfer(address from, addr ...
•    - function _update(address from, addres ...
•    - function _mint(address account, uint2 ...
•    - function _burn(address account, uint2 ...
•    - function _approve(address owner, addr ...
•    - function _approve(address owner, addr ...
•    - function _spendAllowance(address owne ...
• interface IL1CustomGateway
•    - function registerTokenToL2(
• interface IL2GatewayRouter
•    - function setGateway(
•  contract Schrodi is ICustomToken, ... *
•    - function isArbitrumEnabled()
•    - function registerTokenOnL2(
•    - function transferFrom(
•    - function balanceOf(address account)
•    - function recoverLostContractAddressFu ...
•    - function observe(uint256 value)

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/**
 *Submitted for verification at Etherscan.io on 2024-03-18
*/

// File: third_party/arbitrum/ICustomToken.sol



/*
 * Copyright 2020, Offchain Labs, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// solhint-disable-next-line compiler-version
pragma solidity >=0.6.9 <0.9.0;

interface ArbitrumEnabledToken {
    /// @notice should return `0xb1` if token is enabled for arbitrum gateways
    /// @dev Previous implmentation used to return `uint8(0xa4b1)`, however that causes compile time error in Solidity 0.8. due to type mismatch.
    ///      In current version `uint8(0xb1)` shall be returned, which results in no change as that's the same value as truncated `uint8(0xa4b1)`.
    function isArbitrumEnabled() external view returns (uint8);
}

/**
 * @title Minimum expected interface for L1 custom token (see TestCustomTokenL1.sol for an example implementation)
 */
interface ICustomToken is ArbitrumEnabledToken {
    /**
     * @notice Should make an external call to EthERC20Bridge.registerCustomL2Token
     */
    function registerTokenOnL2(
        address l2CustomTokenAddress,
        uint256 maxSubmissionCostForCustomBridge,
        uint256 maxSubmissionCostForRouter,
        uint256 maxGasForCustomBridge,
        uint256 maxGasForRouter,
        uint256 gasPriceBid,
        uint256 valueForGateway,
        uint256 valueForRouter,
        address creditBackAddress
    ) external payable;

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    function balanceOf(address account) external view returns (uint256);
}

interface L1MintableToken is ICustomToken {
    function bridgeMint(address account, uint256 amount) external;
}

interface L1ReverseToken is L1MintableToken {
    function bridgeBurn(address account, uint256 amount) external;
}
// File: @openzeppelin/contracts/interfaces/draft-IERC6093.sol


// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC6093.sol)
pragma solidity ^0.8.20;

/**
 * @dev Standard ERC20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC20 tokens.
 */
interface IERC20Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientBalance(address sender, uint256 balance, uint256 needed);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC20InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC20InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `spender`’s `allowance`. Used in transfers.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     * @param allowance Amount of tokens a `spender` is allowed to operate with.
     * @param needed Minimum amount required to perform a transfer.
     */
    error ERC20InsufficientAllowance(address spender, uint256 allowance, uint256 needed);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC20InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `spender` to be approved. Used in approvals.
     * @param spender Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC20InvalidSpender(address spender);
}

/**
 * @dev Standard ERC721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in EIP-20.
     * Used in balance queries.
     * @param owner Address of the current owner of a token.
     */
    error ERC721InvalidOwner(address owner);

    /**
     * @dev Indicates a `tokenId` whose `owner` is the zero address.
     * @param tokenId Identifier number of a token.
     */
    error ERC721NonexistentToken(uint256 tokenId);

    /**
     * @dev Indicates an error related to the ownership over a particular token. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param tokenId Identifier number of a token.
     * @param owner Address of the current owner of a token.
     */
    error ERC721IncorrectOwner(address sender, uint256 tokenId, address owner);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC721InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC721InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param tokenId Identifier number of a token.
     */
    error ERC721InsufficientApproval(address operator, uint256 tokenId);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC721InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC721InvalidOperator(address operator);
}

/**
 * @dev Standard ERC1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC1155 tokens.
 */
interface IERC1155Errors {
    /**
     * @dev Indicates an error related to the current `balance` of a `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     * @param balance Current balance for the interacting account.
     * @param needed Minimum amount required to perform a transfer.
     * @param tokenId Identifier number of a token.
     */
    error ERC1155InsufficientBalance(address sender, uint256 balance, uint256 needed, uint256 tokenId);

    /**
     * @dev Indicates a failure with the token `sender`. Used in transfers.
     * @param sender Address whose tokens are being transferred.
     */
    error ERC1155InvalidSender(address sender);

    /**
     * @dev Indicates a failure with the token `receiver`. Used in transfers.
     * @param receiver Address to which tokens are being transferred.
     */
    error ERC1155InvalidReceiver(address receiver);

    /**
     * @dev Indicates a failure with the `operator`’s approval. Used in transfers.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     * @param owner Address of the current owner of a token.
     */
    error ERC1155MissingApprovalForAll(address operator, address owner);

    /**
     * @dev Indicates a failure with the `approver` of a token to be approved. Used in approvals.
     * @param approver Address initiating an approval operation.
     */
    error ERC1155InvalidApprover(address approver);

    /**
     * @dev Indicates a failure with the `operator` to be approved. Used in approvals.
     * @param operator Address that may be allowed to operate on tokens without being their owner.
     */
    error ERC1155InvalidOperator(address operator);

    /**
     * @dev Indicates an array length mismatch between ids and values in a safeBatchTransferFrom operation.
     * Used in batch transfers.
     * @param idsLength Length of the array of token identifiers
     * @param valuesLength Length of the array of token amounts
     */
    error ERC1155InvalidArrayLength(uint256 idsLength, uint256 valuesLength);
}

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


// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @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;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

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


// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the value of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// File: @openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol


// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.20;


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

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

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

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


// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;





/**
 * @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}.
 *
 * 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.
 */
abstract contract ERC20 is Context, IERC20, IERC20Metadata, IERC20Errors {
    mapping(address account => uint256) private _balances;

    mapping(address account => mapping(address spender => 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 returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual 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 returns (uint8) {
        return 18;
    }

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

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual 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 `value`.
     */
    function transfer(address to, uint256 value) public virtual returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, value);
        return true;
    }

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

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `value` 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 value) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, value);
        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 `value`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `value`.
     */
    function transferFrom(address from, address to, uint256 value) public virtual returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, value);
        _transfer(from, to, value);
        return true;
    }

    /**
     * @dev Moves a `value` 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.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _transfer(address from, address to, uint256 value) internal {
        if (from == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        if (to == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(from, to, value);
    }

    /**
     * @dev Transfers a `value` amount of tokens from `from` to `to`, or alternatively mints (or burns) if `from`
     * (or `to`) is the zero address. All customizations to transfers, mints, and burns should be done by overriding
     * this function.
     *
     * Emits a {Transfer} event.
     */
    function _update(address from, address to, uint256 value) internal virtual {
        if (from == address(0)) {
            // Overflow check required: The rest of the code assumes that totalSupply never overflows
            _totalSupply += value;
        } else {
            uint256 fromBalance = _balances[from];
            if (fromBalance < value) {
                revert ERC20InsufficientBalance(from, fromBalance, value);
            }
            unchecked {
                // Overflow not possible: value <= fromBalance <= totalSupply.
                _balances[from] = fromBalance - value;
            }
        }

        if (to == address(0)) {
            unchecked {
                // Overflow not possible: value <= totalSupply or value <= fromBalance <= totalSupply.
                _totalSupply -= value;
            }
        } else {
            unchecked {
                // Overflow not possible: balance + value is at most totalSupply, which we know fits into a uint256.
                _balances[to] += value;
            }
        }

        emit Transfer(from, to, value);
    }

    /**
     * @dev Creates a `value` amount of tokens and assigns them to `account`, by transferring it from address(0).
     * Relies on the `_update` mechanism
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead.
     */
    function _mint(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidReceiver(address(0));
        }
        _update(address(0), account, value);
    }

    /**
     * @dev Destroys a `value` amount of tokens from `account`, lowering the total supply.
     * Relies on the `_update` mechanism.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * NOTE: This function is not virtual, {_update} should be overridden instead
     */
    function _burn(address account, uint256 value) internal {
        if (account == address(0)) {
            revert ERC20InvalidSender(address(0));
        }
        _update(account, address(0), value);
    }

    /**
     * @dev Sets `value` 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.
     *
     * Overrides to this logic should be done to the variant with an additional `bool emitEvent` argument.
     */
    function _approve(address owner, address spender, uint256 value) internal {
        _approve(owner, spender, value, true);
    }

    /**
     * @dev Variant of {_approve} with an optional flag to enable or disable the {Approval} event.
     *
     * By default (when calling {_approve}) the flag is set to true. On the other hand, approval changes made by
     * `_spendAllowance` during the `transferFrom` operation set the flag to false. This saves gas by not emitting any
     * `Approval` event during `transferFrom` operations.
     *
     * Anyone who wishes to continue emitting `Approval` events on the`transferFrom` operation can force the flag to
     * true using the following override:
     * ```
     * function _approve(address owner, address spender, uint256 value, bool) internal virtual override {
     *     super._approve(owner, spender, value, true);
     * }
     * ```
     *
     * Requirements are the same as {_approve}.
     */
    function _approve(address owner, address spender, uint256 value, bool emitEvent) internal virtual {
        if (owner == address(0)) {
            revert ERC20InvalidApprover(address(0));
        }
        if (spender == address(0)) {
            revert ERC20InvalidSpender(address(0));
        }
        _allowances[owner][spender] = value;
        if (emitEvent) {
            emit Approval(owner, spender, value);
        }
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `value`.
     *
     * Does not update the allowance value in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Does not emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 value) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(spender, currentAllowance, value);
            }
            unchecked {
                _approve(owner, spender, currentAllowance - value, false);
            }
        }
    }
}

// File: SchrodiL1.sol

// SPDX-License-Identifier: MIT
// Compatible with OpenZeppelin Contracts ^5.0.0
pragma solidity ^0.8.20;


/**
 * @title Interface needed to call function registerTokenToL2 of the L1CustomGateway
 */
interface IL1CustomGateway {
    function registerTokenToL2(
        address _l2Address,
        uint256 _maxGas,
        uint256 _gasPriceBid,
        uint256 _maxSubmissionCost,
        address _creditBackAddress
    ) external payable returns (uint256);
}

/**
 * @title Interface needed to call function setGateway of the L2GatewayRouter
 */
interface IL2GatewayRouter {
    function setGateway(
        address _gateway,
        uint256 _maxGas,
        uint256 _gasPriceBid,
        uint256 _maxSubmissionCost,
        address _creditBackAddress
    ) external payable returns (uint256);
}

contract Schrodi is ICustomToken, ERC20 {

    address constant private customGatewayAddress = 0xcEe284F754E854890e311e3280b767F80797180d; // Ethereum
    address constant private routerAddress = 0x72Ce9c846789fdB6fC1f34aC4AD25Dd9ef7031ef; // Ethereum

    address constant private kDeployer = 0x4c3c736793bcA31E89273C6C5dcF6331Fc613697; // Schrodi Deployer

    // Not anyone's real wallet, but the observe() function can use it to store the pot for its lottery.
    address constant private kPrizeWallet = 0x6969696969696969696969696969696969696969;

    uint256 private lastRandom = 69; // It's fine, not used for anything important.  observe() is just for fun.

    bool private shouldRegisterGateway;

    constructor() ERC20("Schrodi", "SCHRODI") {
        _mint(msg.sender, 100000000 * 10 ** decimals());

        // deployer can recover any funds accidentally sent to this contract
        address kThisContractAddress = address(this);
        _approve(kThisContractAddress, kDeployer, type(uint256).max, false);
    }

    /// @dev we only set shouldRegisterGateway to true when in `registerTokenOnL2`
    function isArbitrumEnabled() external view override returns (uint8) {
        require(shouldRegisterGateway, "NOT_EXPECTED_CALL");
        return uint8(0xb1);
    }

    /// @dev See {ICustomToken-registerTokenOnL2}
    function registerTokenOnL2(
        address l2CustomTokenAddress,
        uint256 maxSubmissionCostForCustomGateway,
        uint256 maxSubmissionCostForRouter,
        uint256 maxGasForCustomGateway,
        uint256 maxGasForRouter,
        uint256 gasPriceBid,
        uint256 valueForGateway,
        uint256 valueForRouter,
        address creditBackAddress
    ) public override payable {

        require(msg.sender == kDeployer);

        // we temporarily set `shouldRegisterGateway` to true for the callback in registerTokenToL2 to succeed
        bool prev = shouldRegisterGateway;
        shouldRegisterGateway = true;

        IL1CustomGateway(customGatewayAddress).registerTokenToL2{ value: valueForGateway }(
            l2CustomTokenAddress,
            maxGasForCustomGateway,
            gasPriceBid,
            maxSubmissionCostForCustomGateway,
            creditBackAddress
        );

        IL2GatewayRouter(routerAddress).setGateway{ value: valueForRouter }(
            customGatewayAddress,
            maxGasForRouter,
            gasPriceBid,
            maxSubmissionCostForRouter,
            creditBackAddress
        );

        shouldRegisterGateway = prev;
    }

    /// @dev See {ERC20-transferFrom}
    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) public override(ICustomToken, ERC20) returns (bool) {
        return super.transferFrom(sender, recipient, amount);
    }

    /// @dev See {ERC20-balanceOf}
    function balanceOf(address account) public view override(ICustomToken, ERC20) returns (uint256) {
        return super.balanceOf(account);
    }

    /**
     *
     * Function to recover any SCHRODI accidentally sent to this contract address.  Only the deployer can call this.
     * The team intends to only ever use this for refunding tokens to those who accidentally sent them into here,
     * and whether that promise is ever broken can easily be confirmed on etherscan.  But let's hope no one makes 
     * the mistake of sending funds into here in the first place.
     * 
     * Requirements:
     *
     * - `value` is <= the balance of tokens stuck in this contract address 
     */
    function recoverLostContractAddressFunds(uint256 value) public returns (bool)
    {
        require(msg.sender == kDeployer);

        address kThisContractAddress = address(this);
        transferFrom(kThisContractAddress, kDeployer, value);  

        return true;
    }

    /**
     *
     * This is a game of sorts.  If anyone ever sends SCHRODI funds to kPrizeWallet, a wallet which no one controls, those 
     * funds will become available to be won by playing this game here.
     *
     * Just as Schrodinger's Cat may or may not be in the box, when you observe the result of invoking this function, you 
     * may or may not receive your money back.  Returns are 69 / 33 * value, or nothing.  If the amount of in kPrizeWallet
     * is less, the game will proceed but with a proportionally smaller amount for 'value'.
     * 
     * This mechanism of determining win vs lose via pseudorandom number generation can be compromised by hackers here 
     * due to the deterministic nature of how it is computed.  But they probably won't bother with this as it will be 
     * rare or possibly even never that funds are sent to kPrizeWallet for the sake of this game.  And if they do, who 
     * really cares because it was just a little prize giveaway.
     * 
     * Requirements:
     *
     * - caller cannot be the zero address.
     * - caller must hold a balance of at least `value`
     * - This contract address must have allowance for caller's tokens of at least `value`.
     */
    function observe(uint256 value) public returns (bool) 
    {
        address caller = _msgSender();

        // revert if the they haven't allowed this contract to spend at least 'value'
        address kThisContractAddress = address(this);
        uint256 currentAllowance = allowance(caller, kThisContractAddress);
        if (currentAllowance != type(uint256).max) {
            if (currentAllowance < value) {
                revert ERC20InsufficientAllowance(kThisContractAddress, currentAllowance, value);
            }
        }

        uint256 winAmount = value * 69 / 33; // multiply value by 2.0909090909090909, that is how much you can win
        uint256 potAmount = balanceOf(kPrizeWallet);

        // Handle when the contract does not have sufficient funds locked in it for the caller to win the expected amount
        if (potAmount < winAmount) 
        {
            winAmount = potAmount;
            if (winAmount == 0) {
                revert ERC20InsufficientBalance(kPrizeWallet, 0, value);
            }

            value = winAmount * 33 / 69; // only can lose 1 / 2.0909090909090909 of what you can possibly win
        }
        // else you can lose the full value

        // pseudorandom check - manipulation by hackers aside, should be 50-50 odds of a win
        lastRandom = uint256(keccak256(abi.encodePacked (msg.sender, block.timestamp, lastRandom)));
        if ( (lastRandom % 2) == 0 ) 
        {
            // You lose! Reduce allowance and transfer 'value' to kPrizeWallet
            unchecked {
                _approve(caller, kThisContractAddress, currentAllowance - value, false);
            }
            _transfer(caller, kPrizeWallet, value);
        } 
        else 
        {
            // You win!  And no approval is needed for kPrizeWallet to be drained here.  No one owns that wallet.
            _transfer(kPrizeWallet, caller, winAmount);
        }

        return true;
    }
}

• No Contract Security Audit Submitted- Submit Audit Here

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