StardustTreasury

{{
  "language": "Solidity",
  "sources": {
    "@openzeppelin/contracts/access/Ownable.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../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.
 *
 * The initial owner is set to the address provided by the deployer. 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;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

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

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @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 {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @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 {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _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);
    }
}
"
    },
    "@openzeppelin/contracts/interfaces/draft-IERC6093.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/draft-IERC6093.sol)
pragma solidity >=0.8.4;

/**
 * @dev Standard ERC-20 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-20 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 ERC-721 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-721 tokens.
 */
interface IERC721Errors {
    /**
     * @dev Indicates that an address can't be an owner. For example, `address(0)` is a forbidden owner in ERC-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 ERC-1155 Errors
 * Interface of the https://eips.ethereum.org/EIPS/eip-6093[ERC-6093] custom errors for ERC-1155 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);
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC1363.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC1363.sol)

pragma solidity >=0.6.2;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}
"
    },
    "@openzeppelin/contracts/interfaces/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC165.sol)

pragma solidity >=0.4.16;

import {IERC165} from "../utils/introspection/IERC165.sol";
"
    },
    "@openzeppelin/contracts/interfaces/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (interfaces/IERC20.sol)

pragma solidity >=0.4.16;

import {IERC20} from "../token/ERC20/IERC20.sol";
"
    },
    "@openzeppelin/contracts/token/ERC20/ERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC20Metadata} from "./extensions/IERC20Metadata.sol";
import {Context} from "../../utils/Context.sol";
import {IERC20Errors} from "../../interfaces/draft-IERC6093.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}.
 *
 * 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 ERC-20
 * applications.
 */
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}.
     *
     * Both 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;
    }

    /// @inheritdoc IERC20
    function totalSupply() public view virtual returns (uint256) {
        return _totalSupply;
    }

    /// @inheritdoc IERC20
    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;
    }

    /// @inheritdoc IERC20
    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}.
     *
     * Skips emitting an {Approval} event indicating an allowance update. This is not
     * required by the ERC. See {xref-ERC20-_approve-address-address-uint256-bool-}[_approve].
     *
     * 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:
     *
     * ```solidity
     * 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);
            }
        }
    }
}
"
    },
    "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity >=0.6.2;

import {IERC20} from "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC-20 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);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (token/ERC20/IERC20.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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);
}
"
    },
    "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @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.encodeCall(token.transfer, (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.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transferFrom, (from, to, 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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

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

    /**
     * @dev Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}
"
    },
    "@openzeppelin/contracts/utils/Context.sol": {
      "content": "// SPDX-License-Identifier: MIT
// 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;
    }
}
"
    },
    "@openzeppelin/contracts/utils/introspection/IERC165.sol": {
      "content": "// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.4.0) (utils/introspection/IERC165.sol)

pragma solidity >=0.4.16;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}
"
    },
    "interfaces/IAzimuth.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

import "../U/interfaces/IAzimuth.sol";
"
    },
    "interfaces/IEcliptic.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

import "../U/interfaces/IEcliptic.sol";
"
    },
    "U/ArbitrumRegisterLib.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

// Minimal Arbitrum L1 interfaces (declared top-level for compilation compatibility)
interface IL1CustomGateway {
    function registerTokenToL2(
        address l2Token,
        uint256 maxGas,
        uint256 gasPriceBid,
        uint256 maxSubmissionCost,
        address creditBackAddress
    ) external payable;
}

interface IL1GatewayRouter {
    function setGateway(
        address gateway,
        uint256 maxGas,
        uint256 gasPriceBid,
        uint256 maxSubmissionCost,
        address creditBackAddress
    ) external payable;
}

library ArbitrumRegisterLib {

    error ZeroAddress();
    error IncorrectMsgValue(uint256 required, uint256 provided);

    /// One-shot Arbitrum registration (gateway map + router setGateway)
    /// @param gatewayParams [submissionCost, maxGas, gasPriceBid]
    /// @param routerParams  [submissionCost, maxGas, gasPriceBid]
    /// @param refundL2Address L2 account that receives leftover submission fees
    function registerCustomArbitrumBridge(
        address arbitrumToken,
        address arbitrumCustomGateway,
        address arbitrumRouter,
        uint256[3] calldata gatewayParams,
        uint256[3] calldata routerParams,
        address refundL2Address
    ) internal {
        if (
            arbitrumToken == address(0) ||
            arbitrumCustomGateway == address(0) ||
            arbitrumRouter == address(0) ||
            refundL2Address == address(0)
        ) revert ZeroAddress();

        uint256 gatewayCallValue = gatewayParams[0] + gatewayParams[1] * gatewayParams[2];
        uint256 routerCallValue = routerParams[0] + routerParams[1] * routerParams[2];
        uint256 requiredValue = gatewayCallValue + routerCallValue;
        if (msg.value != requiredValue) revert IncorrectMsgValue(requiredValue, msg.value);

        // 1) Gateway registration (creates the Arbitrum retryable ticket)
        IL1CustomGateway(arbitrumCustomGateway).registerTokenToL2{ value: gatewayCallValue }(
            arbitrumToken,
            gatewayParams[1], // maxGas
            gatewayParams[2], // gasPriceBid
            gatewayParams[0], // maxSubmissionCost
            refundL2Address
        );

        // 2) Router mapping (second retryable)
        IL1GatewayRouter(arbitrumRouter).setGateway{ value: routerCallValue }(
            arbitrumCustomGateway,
            routerParams[1], // maxGas
            routerParams[2], // gasPriceBid
            routerParams[0], // maxSubmissionCost
            refundL2Address
        );
    }
}
"
    },
    "U/interfaces/IAzimuth.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

interface IAzimuth {
    function getOwner(uint32 _point) external view returns (address);
    function hasBeenLinked(uint32 _point) external view returns (bool);
    function getSpawnProxy(uint16 _point) external view returns (address);
}"
    },
    "U/interfaces/IEcliptic.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

interface IEcliptic {
    function transferFrom(address _from, address _to, uint256 _tokenId) external;
    function transferPoint(uint32 _point, address _target, bool _reset) external;
    function depositAddress() external view returns (address);
    function azimuth() external view returns (address);
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}"
    },
    "U/Stardust.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "./ArbitrumRegisterLib.sol";

/**
 * @title Stardust (U) - ERC-20 token backed by virgin Urbit stars.
 * @notice Each token represents 1/65,536th of an Urbit star. 8 decimal precision.
 * @dev Minting and burning controlled exclusively by the Treasury contract.
 */
contract Stardust is ERC20, Ownable {
    uint256 private constant MAX_SUPPLY = 4_278_190_080 * 10 ** 8;
    bool private bridgeRegistered;

    error AlreadyRegistered();
    error InvalidRefundAddress();

    constructor() ERC20("Stardust", "U") Ownable(msg.sender) {}

    function decimals() public pure override returns (uint8) { return 8; }
    
    function mint(address to, uint256 amount) external onlyOwner { _mint(to, amount); }
    function burn(address from, uint256 amount) external onlyOwner { _burn(from, amount); }
    
    /// @notice Returns the fixed total supply of the Stardust token (10⁻⁸ precision)
    function totalSupply() public pure override returns (uint256) {
        return MAX_SUPPLY;
    }

    /// @notice Arbitrum marker (0xb1) for generic-custom gateway compatibility
    function isArbitrumEnabled() external pure returns (uint8) { return 0xb1; }

    /// One-time Arbitrum bridge registration; forwards calls so this token is msg.sender
    /// @param gatewayParams [submissionCost, maxGas, gasPriceBid]
    /// @param routerParams  [submissionCost, maxGas, gasPriceBid]
    /// @param refundL2Address Arbitrum refund address
    function registerArbitrumBridge(
        address arbitrumToken,
        address arbitrumCustomGateway,
        address arbitrumRouter,
        uint256[3] calldata gatewayParams,
        uint256[3] calldata routerParams,
        address refundL2Address
    ) external payable onlyOwner {
        if (bridgeRegistered) revert AlreadyRegistered();
        if (refundL2Address == address(0) || refundL2Address == address(this)) {
            revert InvalidRefundAddress();
        }
        ArbitrumRegisterLib.registerCustomArbitrumBridge(
            arbitrumToken,
            arbitrumCustomGateway,
            arbitrumRouter,
            gatewayParams,
            routerParams,
            refundL2Address
        );
        bridgeRegistered = true;

        emit ArbitrumBridgeRegistered(
            arbitrumToken,
            arbitrumCustomGateway,
            arbitrumRouter,
            refundL2Address,
            gatewayParams[0],
            routerParams[0]
        );
    }

    event ArbitrumBridgeRegistered(
        address indexed arbitrumToken,
        address indexed arbitrumCustomGateway,
        address indexed arbitrumRouter,
        address refundAddress,
        uint256 gatewaySubmissionCost,
        uint256 routerSubmissionCost
    );
}
"
    },
    "U/StardustTreasury.sol": {
      "content": "// SPDX-License-Identifier: MIT
pragma solidity 0.8.30;

import "./Stardust.sol";
import "../interfaces/IAzimuth.sol";
import "../interfaces/IEcliptic.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
/**
 * @title StardustTreasury - Treasury for wrapping Urbit stars as ERC-20 tokens
 * @notice Deposit virgin Urbit stars to receive 65,536 U tokens per star. Burn U tokens to withdraw stars.
 * @dev Architecture:
 *      - Pull-only deposits via depositStars() after setApprovalForAll(treasury, true)
 *      - Validates: star ID ∈ [256, 65535], never networked
 *      - Uses uint16 for star IDs for type clarity and smaller in-memory footprint; dynamic storage
 *        arrays do not pack, so storage gas is unaffected
 *      - All ownership checks resolve via IEcliptic(ecliptic).azimuth() to match Ecliptic's
 *        internal validation and avoid opaque 0x reverts
 *      - Pull-only design ensures no outbound transfers on deposit, minimizing attack surface
 *      - Immutable after deployment
 * 
 *      Security Assumptions:
 *      - Azimuth and Ecliptic contracts are canonical and trusted
 *      - hasBeenLinked() is the authoritative virginity check (never had keys set)
 *      - No reentrancy guards needed: only calls trusted Urbit contracts, no external callbacks
 */
contract StardustTreasury {
    using SafeERC20 for IERC20;
    
    // Constants
    uint256 private constant TOKENS_PER_STAR = 65_536 * 10**8; // 65,536 tokens with 8 decimals
    uint32 private constant STAR_MIN = 256;
    uint32 private constant STAR_MAX = 65535;
    uint256 private constant MAX_BATCH = 255;
    address private constant L2_DEPOSIT_ADDRESS = 0x1111111111111111111111111111111111111111;
    
    // Immutable state
    Stardust public immutable stardust;
    IAzimuth public immutable azimuth;
    IEcliptic public immutable ecliptic;
    
    // State variables
    uint16[] private depositedStars; // Star IDs in treasury (each element uses one slot despite uint16)
    mapping(uint32 => uint16) private indexPlusOne; // Star location: 0=not deposited, else array index+1
    bool public sunsetActivated;
    uint64 public sunsetActivatedAt;    // Timestamp when sunset was activated (0 if not activated)
    
    // Guardian role management (can activate sunset and rescue tokens)
    address public guardian;            // Emergency role (initially deployer)
    address public pendingGuardian;     // Pending guardian for two-step transfer
    
    // Events
    event StarsDeposited(address indexed depositor, uint32[] starIds, uint256 totalTokensIssued);
    event StarsWithdrawn(address indexed withdrawer, address indexed recipient, uint32[] starIds, uint256 totalTokensBurned);
    event SunsetActivated(address indexed activator, uint64 timestamp);
    event GuardianTransferStarted(address indexed current, address indexed pending);
    event GuardianTransferred(address indexed previous, address indexed current);
    
    // Custom errors
    error NotStar();
    error AlreadyLinked();
    error SpawnProxyIsL2Deposit();
    error StarAlreadyDeposited();
    error StarNotDeposited();
    error SunsetAlreadyActivated();
    error SunsetActive();
    error NotGuardian();
    error NotPendingGuardian();
    error ZeroAddress();
    error BadArrayLength();
    error NotOwner();
    error NoETH();
    error NotAllowedToken();
    error EthSendFailed();
    error NotApprovedForAll();
    error AzimuthMismatch();
    error L2DepositAddressMismatch();
    
    /**
     * @notice Constructor
     * @param _azimuth Address of the Azimuth contract
     * @param _ecliptic Address of the Ecliptic contract
     */
    constructor(address _azimuth, address _ecliptic) {
        if (_azimuth == address(0) || _ecliptic == address(0)) revert ZeroAddress();
        
        azimuth = IAzimuth(_azimuth);
        ecliptic = IEcliptic(_ecliptic);
        guardian = msg.sender; // Initially deployer, can be transferred to multisig

        // Ensure we're using the same Azimuth instance as Ecliptic for consistent validation
        if (address(azimuth) != ecliptic.azimuth()) revert AzimuthMismatch();

        // Deploy the Stardust token
        stardust = new Stardust();
    }
    
    /**
     * @notice Deposit Urbit stars and receive U tokens
     * @param starIds Array of star IDs to deposit (max 255 per transaction)
     * @dev Requires prior setApprovalForAll. Validates virginity, pulls stars, mints tokens.
     */
    function depositStars(uint32[] calldata starIds) external {
        if (sunsetActivated) revert SunsetActive();
        uint256 count = starIds.length;
        if (count == 0 || count > MAX_BATCH) revert BadArrayLength();
        
        // Use Azimuth for ownership/virginity checks (verified to match Ecliptic's in constructor)
        IAzimuth A = azimuth;
        
        // One-time operator approval check upfront (cheaper than per-star)
        if (!ecliptic.isApprovedForAll(msg.sender, address(this))) revert NotApprovedForAll();
        
        // 65,536 IDs → 256 words × 256 bits (8 KB) for duplicate detection
        uint256[256] memory seen;
        
        // Preflight validation using Ecliptic's Azimuth
        for (uint256 i; i < count;) {
            uint32 id = starIds[i];
            
            // Range check (stars only: 256-65535)
            if (id < STAR_MIN || id > STAR_MAX) revert NotStar();
            
            // Duplicate check via bitmap (detects duplicates within this call's input array only)
            uint256 w = id >> 8;
            uint256 m = uint256(1) << (id & 0xff);
            if (seen[w] & m != 0) revert StarAlreadyDeposited();
            seen[w] |= m;
            
            // Check not already deposited
            if (indexPlusOne[id] != 0) revert StarAlreadyDeposited();
            
            // Virginity check (never had keys set)
            if (A.hasBeenLinked(id)) revert AlreadyLinked();

            // Special-case: if spawnProxy == L2 deposit address, reset won't clear it.
            if (A.getSpawnProxy(uint16(id)) == L2_DEPOSIT_ADDRESS) revert SpawnProxyIsL2Deposit();
            
            // Owner check using Ecliptic's Azimuth ensures _from parameter alignment
            if (A.getOwner(id) != msg.sender) revert NotOwner();
            
            unchecked { ++i; }
        }
        
        // Pull all stars and record in treasury
        uint256 baseLen = depositedStars.length;
        for (uint256 i; i < count;) {
            uint32 starId = starIds[i];
            
            ecliptic.transferFrom(msg.sender, address(this), uint256(starId));
            
            // Record in treasury
            depositedStars.push(uint16(starId));
            indexPlusOne[starId] = uint16(baseLen + i + 1);
            
            unchecked { ++i; }
        }
        
        // Mint tokens for all deposited stars
        uint256 totalTokens;
        unchecked { totalTokens = count * TOKENS_PER_STAR; } // Safe: max 255 * 65536e8 << 2^256
        stardust.mint(msg.sender, totalTokens);
        
        emit StarsDeposited(msg.sender, starIds, totalTokens);
    }
    
    /**
     * @notice Withdraw stars by burning U tokens (LIFO order)
     * @param count Number of stars to withdraw
     */
    function withdrawStars(uint256 count) external {
        if (count == 0 || count > MAX_BATCH) revert BadArrayLength();
        
        uint256 len = depositedStars.length;
        if (count > len) revert BadArrayLength();
        
        // Build array of stars to withdraw (LIFO)
        uint32[] memory starIds = new uint32[](count);
        for (uint256 i; i < count;) {
            starIds[i] = _removeAt(len - 1 - i);
            unchecked { ++i; }
        }
        
        _withdraw(msg.sender, starIds);
    }
    
    /**
     * @notice Withdraw specific stars by burning U tokens
     * @param starIds Array of specific star IDs to withdraw
     */
    function withdrawSpecificStars(uint32[] calldata starIds) external {
        uint256 count = starIds.length;
        if (count == 0 || count > MAX_BATCH) revert BadArrayLength();
        
        // Remove each star from storage
        for (uint256 i; i < count;) {
            uint16 ip1 = indexPlusOne[starIds[i]];
            if (ip1 == 0) revert StarNotDeposited();
            _removeAt(uint256(ip1 - 1));
            unchecked { ++i; }
        }
        
        _withdraw(msg.sender, starIds);
    }
    
    /**
     * @notice Internal function to handle withdrawal logic
     * @param recipient The address to send the stars to
     * @param starIds Array of star IDs to withdraw
     * @dev Burns tokens and transfers stars
     */
    function _withdraw(address recipient, uint32[] memory starIds) private {
        uint256 count = starIds.length;
        uint256 totalTokens;
        unchecked { totalTokens = count * TOKENS_PER_STAR; } // Safe: max 255 * 65536e8 << 2^256
        
        // Burn tokens (will revert if insufficient balance)
        stardust.burn(msg.sender, totalTokens);
        
        // Transfer all stars
        for (uint256 i; i < count;) {
            ecliptic.transferPoint(starIds[i], recipient, true);
            unchecked { ++i; }
        }
        
        emit StarsWithdrawn(msg.sender, recipient, starIds, totalTokens);
    }
    
    /**
     * @notice Only the guardian can call this function
     */
    modifier onlyGuardian() {
        if (msg.sender != guardian) revert NotGuardian();
        _;
    }
    
    /**
     * @notice Activate sunset mode - permanently disables new deposits
     * @dev Only callable by guardian, irreversible once activated
     */
    function activateSunset() external onlyGuardian {
        if (sunsetActivated) revert SunsetAlreadyActivated();
        
        uint64 ts = uint64(block.timestamp);
        sunsetActivated = true;
        sunsetActivatedAt = ts;
        
        emit SunsetActivated(msg.sender, ts);
    }
    
    /**
     * @notice Start transfer of guardian role (step 1 of 2)
     * @param newGuardian Address to transfer guardian role to
     * @dev Two-step process prevents accidental transfer to wrong address
     */
    function transferGuardian(address newGuardian) external onlyGuardian {
        if (newGuardian == address(0)) revert ZeroAddress();
        pendingGuardian = newGuardian;
        emit GuardianTransferStarted(guardian, newGuardian);
    }
    
    /**
     * @notice Accept transfer of guardian role (step 2 of 2)
     * @dev Must be called by the pending guardian to complete transfer
     */
    function acceptGuardian() external {
        if (msg.sender != pendingGuardian) revert NotPendingGuardian();
        address previous = guardian;
        guardian = msg.sender;
        pendingGuardian = address(0);
        emit GuardianTransferred(previous, guardian);
    }
    
    /**
     * @notice Permanently renounce the guardian role
     * @dev After calling this, sunset can never be activated and rescue is disabled. Use with extreme caution.
     */
    function renounceGuardian() external onlyGuardian {
        emit GuardianTransferred(guardian, address(0));
        guardian = address(0);
        pendingGuardian = address(0);
    }
    
    /// @notice Get the total number of stars in the treasury
    function totalStarsDeposited() external view returns (uint256) {
        return depositedStars.length;
    }
    
    /**
     * @notice Check if multiple stars are deposited
     * @param starIds Array of star IDs to check
     * @return Array of booleans indicating deposit status
     */
    function areDeposited(uint32[] calldata starIds) 
        external 
        view 
        returns (bool[] memory) 
    {
        uint256 count = starIds.length;
        bool[] memory results = new bool[](count);
        
        for (uint256 i; i < count;) {
            results[i] = indexPlusOne[starIds[i]] != 0;
            unchecked { ++i; }
        }
        
        return results;
    }
    
    /**
     * @notice Get deposit information about a star
     * @param starId The star ID to query
     * @return isDeposited Whether the star is currently deposited
     * @return depositIndex The index in the depositedStars array (type(uint256).max if not deposited)
     */
    function getStarInfo(uint32 starId) 
        external 
        view 
        returns (bool isDeposited, uint256 depositIndex) 
    {
        uint16 idxPlusOne = indexPlusOne[starId];
        
        if (idxPlusOne == 0) {
            return (false, type(uint256).max);
        }
        
        // Return true and the actual index (subtract 1 from stored value)
        return (true, uint256(idxPlusOne - 1));
    }
    
    /**
     * @notice Remove and return a star at the given index
     * @param idx The index in depositedStars array to remove
     * @dev Maintains array density by swap-and-pop
     */
    function _removeAt(uint256 idx) private returns (uint32 removed) {
        uint256 last = depositedStars.length - 1;
        removed = uint32(depositedStars[idx]);
        
        // Swap with last element if not already last
        if (idx != last) {
            uint16 lastStar = depositedStars[last];
            depositedStars[idx] = lastStar;
            indexPlusOne[uint32(lastStar)] = uint16(idx + 1);
        }
        
        depositedStars.pop();
        delete indexPlusOne[removed];
    }

    /**
     * @notice Guardian helper that forwards bridge registration to the token.
     * @param arbitrumToken L2 token address
     * @param arbitrumCustomGateway L1 custom gateway address
     * @param arbitrumRouter L1 gateway router address
     * @param gatewayParams [submissionCost, maxGas, gasPriceBid]
     * @param routerParams  [submissionCost, maxGas, gasPriceBid]
     * @param refundL2Address Arbitrum address that receives any leftover submission funds
     */
    function registerStardustBridge(
        address arbitrumToken,
        address arbitrumCustomGateway,
        address arbitrumRouter,
        uint256[3] calldata gatewayParams,
        uint256[3] calldata routerParams,
        address refundL2Address
    ) external onlyGuardian payable {
        stardust.registerArbitrumBridge{ value: msg.value }(
            arbitrumToken,
            arbitrumCustomGateway,
            arbitrumRouter,
            gatewayParams,
            routerParams,
            refundL2Address
        );
    }
    
    /**
     * @notice Rescue ETH or ERC20 tokens sent to this contract
     * @param asset Token address (use address(0) for ETH)
     * @param to Recipient address
     */
    function rescue(address asset, address to) external onlyGuardian {
        if (to == address(0)) revert ZeroAddress();
        
        // Rescue ETH
        if (asset == address(0)) {
            uint256 ethBalance = address(this).balance;
            if (ethBalance > 0) {
                (bool success, ) = to.call{value: ethBalance}("");
                if (!success) revert EthSendFailed();
            }
            return;
        }
        
        // Rescue ERC20 (except Stardust)
        if (asset == address(stardust)) revert NotAllowedToken();
        uint256 tokenBalance = IERC20(asset).balanceOf(address(this));
        if (tokenBalance > 0) {
            IERC20(asset).safeTransfe