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// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.8.27;

import { UtilLib } from "./utils/UtilLib.sol";

import { LRTConfigRoleChecker, ILRTConfig, LRTConstants } from "./utils/LRTConfigRoleChecker.sol";

import { ERC20Upgradeable, Initializable } from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";

import { PausableUpgradeable } from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";

/// @title rsETH token Contract

/// @author Kelp DAO

/// @notice The ERC20 contract for the rsETH token

contract RSETH is Initializable, LRTConfigRoleChecker, ERC20Upgradeable, PausableUpgradeable {

error DailyMintLimitExceeded(uint256 currentAmount, uint256 maxAmount);

/*//////////////////////////////////////////////////////////////

State Variables

event MaxMintAmountPerDayUpdated(uint256 newMaxMintAmountPerDay);

//////////////////////////////////////////////////////////////*/

/// @notice Maximum amount that can be minted in a 24-hour period

uint256 public maxMintAmountPerDay;

/// @notice Amount minted in the current 24-hour period

uint256 public currentPeriodMintedAmount;

/// @notice Start time of the current 24-hour period

uint256 public periodStartTime;

/// @notice Address to which recovered funds are sent

address public custodyAddress;

/// @dev If > 0, transfers TO or FROM this address are blocked until timestamp (24h block)

mapping(address account => uint256 blockedUntil) public transfersBlockedUntil;

/// @dev Permanently exempt addresses mapping (rsETH transfers for these can never be blocked)

mapping(address account => bool isExempt) public isPermanentlyExempt;

/*//////////////////////////////////////////////////////////////

Modifiers

//////////////////////////////////////////////////////////////*/

/// @dev Modifier to check and update daily mint limits

/// @param amount The amount to be minted

modifier checkDailyMintLimit(uint256 amount) {

// Check if we need to reset the period or initialize the period

// Check if we need to reset the period if it has been more than 24 hours

if (periodStartTime == 0 || block.timestamp >= periodStartTime + 1 days) {

if (block.timestamp >= periodStartTime + 1 days) {

currentPeriodMintedAmount = 0;

periodStartTime = block.timestamp;

periodStartTime = getCurrentPeriodStartTime();

}

// Check if minting would exceed the daily limit

if (currentPeriodMintedAmount + amount > maxMintAmountPerDay) {

revert DailyMintLimitExceeded(currentPeriodMintedAmount + amount, maxMintAmountPerDay);

}

currentPeriodMintedAmount += amount;

}

/*//////////////////////////////////////////////////////////////

Custom Errors

//////////////////////////////////////////////////////////////*/

error PeriodStartTimeShouldBeWithin24Hours();

error DailyMintLimitExceeded(uint256 currentAmount, uint256 maxAmount);

error TransfersBlocked(address account, uint256 blockedUntil);

error CannotPermanentlyExemptBlockedAddress(address account, uint256 blockedUntil);

error AddressPermanentlyExempt(address account);

error NoActiveTransferBlock(address account);

/*//////////////////////////////////////////////////////////////

Events

//////////////////////////////////////////////////////////////*/

event MaxMintAmountPerDayUpdated(uint256 newMaxMintAmountPerDay);

event FrozenFundsRecovered(address indexed from, address indexed to, uint256 amount);

event UserTransfersBlocked(address indexed user, uint256 until);

event PermanentExemptionAdded(address indexed account);

event CustodyAddressUpdated(address indexed newCustodyAddress);

event PeriodStartTimeSet(uint256 newPeriodStartTime);

/*//////////////////////////////////////////////////////////////

Constructor

//////////////////////////////////////////////////////////////*/

/// @custom:oz-upgrades-unsafe-allow constructor

constructor() {

_disableInitializers();

}

/*//////////////////////////////////////////////////////////////

Initializers

//////////////////////////////////////////////////////////////*/

/// @dev Initializes the contract

/// @param admin Admin address

/// @param lrtConfigAddr LRT config address

function initialize(address admin, address lrtConfigAddr) external initializer {

UtilLib.checkNonZeroAddress(admin);

UtilLib.checkNonZeroAddress(lrtConfigAddr);

__ERC20_init("rsETH", "rsETH");

__Pausable_init();

lrtConfig = ILRTConfig(lrtConfigAddr);

emit UpdatedLRTConfig(lrtConfigAddr);

}

/// @notice Initializes the contract with a period start time and the custody address

/// @param _periodStartTime The period start time

/// @param _custodyAddress The custody address for recovered funds

function reinitialize(uint256 _periodStartTime, address _custodyAddress) external reinitializer(2) onlyLRTManager {

if (_periodStartTime > block.timestamp || _periodStartTime <= block.timestamp - 1 days) {

revert PeriodStartTimeShouldBeWithin24Hours();

}

periodStartTime = _periodStartTime;

emit PeriodStartTimeSet(_periodStartTime);

_setCustodyAddress(_custodyAddress);

}

/*//////////////////////////////////////////////////////////////

Manager Functions

//////////////////////////////////////////////////////////////*/

/// @notice Sets the maximum amount that can be minted in 24 hours

/// @param _maxMintAmountPerDay The maximum amount that can be minted in 24 hours

function setMaxMintAmountPerDay(uint256 _maxMintAmountPerDay) external onlyLRTManager {

maxMintAmountPerDay = _maxMintAmountPerDay;

emit MaxMintAmountPerDayUpdated(_maxMintAmountPerDay);

}

/// @notice Permanently add accounts to the exempted list (non-reversible)

/// @param accounts Accounts to mark as permanently exempt (cannot have transfers blocked)

function addPermanentExemptions(address[] calldata accounts) external onlyLRTManager {

uint256 length = accounts.length;

for (uint256 i = 0; i < length; ++i) {

address account = accounts[i];

UtilLib.checkNonZeroAddress(account);

// Ensure the account is not currently blocked

uint256 blockedUntil = transfersBlockedUntil[account];

if (blockedUntil != 0) {

if (block.timestamp < blockedUntil) {

revert CannotPermanentlyExemptBlockedAddress(account, blockedUntil);

}

// Auto-clean up expired block

delete transfersBlockedUntil[account];

}

if (!isPermanentlyExempt[account]) {

isPermanentlyExempt[account] = true;

emit PermanentExemptionAdded(account);

}

/// @notice Block transfers TO and FROM given users for 24 hours

/// @dev Re-applying the block before expiry refreshes the hold to `block.timestamp + 1 days`

/// (i.e. not cumulative; never more than 24h from the latest call). Exempt addresses cannot be blocked.

/// Emits {UserTransfersBlocked} only when the timestamp changes.

/// @param accounts Addresses to block.

function blockUserTransfers(address[] calldata accounts) external onlyLRTManager {

uint256 blockedUntil = block.timestamp + 1 days;

uint256 length = accounts.length;

for (uint256 i = 0; i < length; ++i) {

address account = accounts[i];

if (isPermanentlyExempt[account] || account == address(0)) continue;

uint256 prevBlockedUntil = transfersBlockedUntil[account];

if (blockedUntil != prevBlockedUntil) {

transfersBlockedUntil[account] = blockedUntil;

emit UserTransfersBlocked(account, blockedUntil);

}

/*//////////////////////////////////////////////////////////////

Pause Management

//////////////////////////////////////////////////////////////*/

/// @dev Triggers stopped state. Contract must not be paused.

function pause() external onlyRole(LRTConstants.PAUSER_ROLE) {

_pause();

}

/// @dev Returns to normal state. Contract must be paused.

function unpause() external onlyLRTAdmin {

_unpause();

}

/*//////////////////////////////////////////////////////////////

Admin Functions

//////////////////////////////////////////////////////////////*/

/// @notice Sets the custody address for recovered funds

/// @param newCustodyAddress The new custody address

function setCustodyAddress(address newCustodyAddress) external onlyLRTAdmin {

_setCustodyAddress(newCustodyAddress);

}

/// @notice Recover the entire balance from a currently blocked, non-exempt address to a designated custody address

/// @dev Only callable by LRT admin. Works only while the block is active.

/// Emits {FrozenFundsRecovered} even if the recovered amount is zero (for transparency and completeness).

function recoverFrozenFunds(address from) external onlyLRTAdmin {

UtilLib.checkNonZeroAddress(from);

UtilLib.checkNonZeroAddress(custodyAddress);

if (isPermanentlyExempt[from]) revert AddressPermanentlyExempt(from);

uint256 blockedUntil = transfersBlockedUntil[from];

if (blockedUntil == 0 || block.timestamp >= blockedUntil) revert NoActiveTransferBlock(from);

uint256 accountBalance = balanceOf(from);

// Bypass transfer block enforcement when transferring to custody address

super._transfer(from, custodyAddress, accountBalance);

emit FrozenFundsRecovered(from, custodyAddress, accountBalance);

}

/*//////////////////////////////////////////////////////////////

Mint & Burn

//////////////////////////////////////////////////////////////*/

/// @notice Mints rsETH when called by an authorized caller

/// @param to the account to mint to

/// @param amount the amount of rsETH to mint

function mint(

address to,

uint256 amount

)

external

onlyRole(LRTConstants.MINTER_ROLE)

whenNotPaused

checkDailyMintLimit(amount)

{

_enforceNotBlocked(to);

_mint(to, amount);

}

/// @notice Burns rsETH when called by an authorized caller

/// @param account the account to burn from

/// @param amount the amount of rsETH to burn

function burnFrom(address account, uint256 amount) external onlyRole(LRTConstants.BURNER_ROLE) whenNotPaused {

_enforceNotBlocked(account);

_burn(account, amount);

}

/// @dev Triggers stopped state.

/*//////////////////////////////////////////////////////////////

/// @dev Only callable by LRT config manager. Contract must NOT be paused.

View Functions

function pause() external onlyLRTManager {

//////////////////////////////////////////////////////////////*/

_pause();

/// @notice Returns the aligned start timestamp of the effective current 24-hour minting period, accounting for any

/// possibly skipped days

/// @return uint256 The start timestamp of the effective current 24-hour period

function getCurrentPeriodStartTime() public view returns (uint256) {

// Calculate the full (complete) days elapsed since the period start time (floors the result)

uint256 daysElapsed = (block.timestamp - periodStartTime) / 1 days;

return periodStartTime + daysElapsed * 1 days;

}

/// @notice Returns to normal state.

/// @notice Gets the remaining daily minting limit

/// @dev Only callable by the rsETH admin. Contract must be paused

/// @return uint256 The remaining daily minting limit

function unpause() external onlyLRTAdmin {

function remainingDailyMintLimit() external view returns (uint256) {

_unpause();

if (maxMintAmountPerDay == 0) return 0;

// If we're on a new day but no mint has occurred yet, treat currentPeriodMintedAmount as 0

uint256 effectiveDailyMintAmount = (block.timestamp >= periodStartTime + 1 days) ? 0 : currentPeriodMintedAmount;

return maxMintAmountPerDay > effectiveDailyMintAmount ? maxMintAmountPerDay - effectiveDailyMintAmount : 0;

}

/// @notice Returns the timestamp at which the current effective daily minting period ends,

/// accounting for any skipped days during which no minting occurred

/// @dev A mint executed at exactly this timestamp is counted towards the next period's minting limit

/// @return uint256 The timestamp at which the effective current minting period ends

function getNextDailyLimitResetTimestamp() external view returns (uint256) {

return getCurrentPeriodStartTime() + 1 days;

}

/*//////////////////////////////////////////////////////////////

Internal Functions

//////////////////////////////////////////////////////////////*/

/// @dev Override ERC20 `_transfer` to enforce transfer blocks on `from` and `to` addresses

function _transfer(address from, address to, uint256 amount) internal override {

_enforceNotBlocked(from);

_enforceNotBlocked(to);

super._transfer(from, to, amount);

}

/// @dev Reverts if `account` is currently blocked (used for transfers, mints, and burns)

function _enforceNotBlocked(address account) internal {

// Addresses that are permanently exempt can never be blocked

if (isPermanentlyExempt[account]) return;

// Check if the account has an active transfer block

uint256 blockedUntil = transfersBlockedUntil[account];

if (blockedUntil == 0) return;

if (block.timestamp < blockedUntil) revert TransfersBlocked(account, blockedUntil);

// Auto-clean up expired block

delete transfersBlockedUntil[account];

}

/// @dev Internal function to set the custody address

function _setCustodyAddress(address newCustodyAddress) internal {

UtilLib.checkNonZeroAddress(newCustodyAddress);

custodyAddress = newCustodyAddress;

emit CustodyAddressUpdated(newCustodyAddress);

}

保存された差分

原文

ファイルを開く

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.27;

import { UtilLib } from "./utils/UtilLib.sol";
import { LRTConfigRoleChecker, ILRTConfig, LRTConstants } from "./utils/LRTConfigRoleChecker.sol";

import { ERC20Upgradeable, Initializable } from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import { PausableUpgradeable } from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";

/// @title rsETH token Contract
/// @author Kelp DAO
/// @notice The ERC20 contract for the rsETH token
contract RSETH is Initializable, LRTConfigRoleChecker, ERC20Upgradeable, PausableUpgradeable {
    error DailyMintLimitExceeded(uint256 currentAmount, uint256 maxAmount);

event MaxMintAmountPerDayUpdated(uint256 newMaxMintAmountPerDay);

uint256 public maxMintAmountPerDay;
    uint256 public currentPeriodMintedAmount;
    uint256 public periodStartTime;

/// @dev Modifier to check and update daily mint limits
    /// @param amount The amount to be minted
    modifier checkDailyMintLimit(uint256 amount) {
        // Check if we need to reset the period or initialize the period
        if (periodStartTime == 0 || block.timestamp >= periodStartTime + 1 days) {
            currentPeriodMintedAmount = 0;
            periodStartTime = block.timestamp;
        }

// Check if minting would exceed the daily limit
        if (currentPeriodMintedAmount + amount > maxMintAmountPerDay) {
            revert DailyMintLimitExceeded(currentPeriodMintedAmount + amount, maxMintAmountPerDay);
        }

currentPeriodMintedAmount += amount;
        _;
    }

/// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

/// @dev Initializes the contract
    /// @param admin Admin address
    /// @param lrtConfigAddr LRT config address
    function initialize(address admin, address lrtConfigAddr) external initializer {
        UtilLib.checkNonZeroAddress(admin);
        UtilLib.checkNonZeroAddress(lrtConfigAddr);

__ERC20_init("rsETH", "rsETH");
        __Pausable_init();
        lrtConfig = ILRTConfig(lrtConfigAddr);
        emit UpdatedLRTConfig(lrtConfigAddr);
    }

/// @notice Sets the maximum amount that can be minted in 24 hours
    /// @param _maxMintAmountPerDay The maximum amount that can be minted in 24 hours
    function setMaxMintAmountPerDay(uint256 _maxMintAmountPerDay) external onlyLRTManager {
        maxMintAmountPerDay = _maxMintAmountPerDay;
        emit MaxMintAmountPerDayUpdated(_maxMintAmountPerDay);
    }

/// @notice Mints rsETH when called by an authorized caller
    /// @param to the account to mint to
    /// @param amount the amount of rsETH to mint
    function mint(
        address to,
        uint256 amount
    )
        external
        onlyRole(LRTConstants.MINTER_ROLE)
        whenNotPaused
        checkDailyMintLimit(amount)
    {
        _mint(to, amount);
    }

/// @notice Burns rsETH when called by an authorized caller
    /// @param account the account to burn from
    /// @param amount the amount of rsETH to burn
    function burnFrom(address account, uint256 amount) external onlyRole(LRTConstants.BURNER_ROLE) whenNotPaused {
        _burn(account, amount);
    }

/// @dev Triggers stopped state.
    /// @dev Only callable by LRT config manager. Contract must NOT be paused.
    function pause() external onlyLRTManager {
        _pause();
    }

/// @notice Returns to normal state.
    /// @dev Only callable by the rsETH admin. Contract must be paused
    function unpause() external onlyLRTAdmin {
        _unpause();
    }
}

変更されたテキスト

ファイルを開く

// SPDX-License-Identifier: BUSL-1.1
pragma solidity 0.8.27;

import { UtilLib } from "./utils/UtilLib.sol";
import { LRTConfigRoleChecker, ILRTConfig, LRTConstants } from "./utils/LRTConfigRoleChecker.sol";

/// @title rsETH token Contract
/// @author Kelp DAO
/// @notice The ERC20 contract for the rsETH token
contract RSETH is Initializable, LRTConfigRoleChecker, ERC20Upgradeable, PausableUpgradeable {
    /*//////////////////////////////////////////////////////////////
                            State Variables
    //////////////////////////////////////////////////////////////*/

/// @notice Maximum amount that can be minted in a 24-hour period
    uint256 public maxMintAmountPerDay;

/// @notice Amount minted in the current 24-hour period
    uint256 public currentPeriodMintedAmount;

/// @notice Start time of the current 24-hour period
    uint256 public periodStartTime;

/// @notice Address to which recovered funds are sent
    address public custodyAddress;

/// @dev If > 0, transfers TO or FROM this address are blocked until timestamp (24h block)
    mapping(address account => uint256 blockedUntil) public transfersBlockedUntil;

/// @dev Permanently exempt addresses mapping (rsETH transfers for these can never be blocked)
    mapping(address account => bool isExempt) public isPermanentlyExempt;

/*//////////////////////////////////////////////////////////////
                            Modifiers
    //////////////////////////////////////////////////////////////*/

/// @dev Modifier to check and update daily mint limits
    /// @param amount The amount to be minted
    modifier checkDailyMintLimit(uint256 amount) {
        // Check if we need to reset the period if it has been more than 24 hours
        if (block.timestamp >= periodStartTime + 1 days) {
            currentPeriodMintedAmount = 0;
            periodStartTime = getCurrentPeriodStartTime();
        }

currentPeriodMintedAmount += amount;
        _;
    }

/*//////////////////////////////////////////////////////////////
                            Custom Errors
    //////////////////////////////////////////////////////////////*/

error PeriodStartTimeShouldBeWithin24Hours();
    error DailyMintLimitExceeded(uint256 currentAmount, uint256 maxAmount);
    error TransfersBlocked(address account, uint256 blockedUntil);
    error CannotPermanentlyExemptBlockedAddress(address account, uint256 blockedUntil);
    error AddressPermanentlyExempt(address account);
    error NoActiveTransferBlock(address account);

/*//////////////////////////////////////////////////////////////
                            Events
    //////////////////////////////////////////////////////////////*/

event MaxMintAmountPerDayUpdated(uint256 newMaxMintAmountPerDay);
    event FrozenFundsRecovered(address indexed from, address indexed to, uint256 amount);
    event UserTransfersBlocked(address indexed user, uint256 until);
    event PermanentExemptionAdded(address indexed account);
    event CustodyAddressUpdated(address indexed newCustodyAddress);
    event PeriodStartTimeSet(uint256 newPeriodStartTime);

/*//////////////////////////////////////////////////////////////
                            Constructor
    //////////////////////////////////////////////////////////////*/

/// @custom:oz-upgrades-unsafe-allow constructor
    constructor() {
        _disableInitializers();
    }

/*//////////////////////////////////////////////////////////////
                            Initializers
    //////////////////////////////////////////////////////////////*/

__ERC20_init("rsETH", "rsETH");
        __Pausable_init();
        lrtConfig = ILRTConfig(lrtConfigAddr);
        emit UpdatedLRTConfig(lrtConfigAddr);
    }

/// @notice Initializes the contract with a period start time and the custody address
    /// @param _periodStartTime The period start time
    /// @param _custodyAddress The custody address for recovered funds
    function reinitialize(uint256 _periodStartTime, address _custodyAddress) external reinitializer(2) onlyLRTManager {
        if (_periodStartTime > block.timestamp || _periodStartTime <= block.timestamp - 1 days) {
            revert PeriodStartTimeShouldBeWithin24Hours();
        }
        periodStartTime = _periodStartTime;
        emit PeriodStartTimeSet(_periodStartTime);

_setCustodyAddress(_custodyAddress);
    }

/*//////////////////////////////////////////////////////////////
                            Manager Functions
    //////////////////////////////////////////////////////////////*/

/// @notice Permanently add accounts to the exempted list (non-reversible)
    /// @param accounts Accounts to mark as permanently exempt (cannot have transfers blocked)
    function addPermanentExemptions(address[] calldata accounts) external onlyLRTManager {
        uint256 length = accounts.length;

for (uint256 i = 0; i < length; ++i) {
            address account = accounts[i];
            UtilLib.checkNonZeroAddress(account);

// Ensure the account is not currently blocked
            uint256 blockedUntil = transfersBlockedUntil[account];
            if (blockedUntil != 0) {
                if (block.timestamp < blockedUntil) {
                    revert CannotPermanentlyExemptBlockedAddress(account, blockedUntil);
                }
                // Auto-clean up expired block
                delete transfersBlockedUntil[account];
            }

if (!isPermanentlyExempt[account]) {
                isPermanentlyExempt[account] = true;
                emit PermanentExemptionAdded(account);
            }
        }
    }

/// @notice Block transfers TO and FROM given users for 24 hours
    /// @dev Re-applying the block before expiry refreshes the hold to `block.timestamp + 1 days`
    ///      (i.e. not cumulative; never more than 24h from the latest call). Exempt addresses cannot be blocked.
    ///      Emits {UserTransfersBlocked} only when the timestamp changes.
    /// @param accounts Addresses to block.
    function blockUserTransfers(address[] calldata accounts) external onlyLRTManager {
        uint256 blockedUntil = block.timestamp + 1 days;
        uint256 length = accounts.length;

for (uint256 i = 0; i < length; ++i) {
            address account = accounts[i];

if (isPermanentlyExempt[account] || account == address(0)) continue;

uint256 prevBlockedUntil = transfersBlockedUntil[account];

if (blockedUntil != prevBlockedUntil) {
                transfersBlockedUntil[account] = blockedUntil;
                emit UserTransfersBlocked(account, blockedUntil);
            }
        }
    }

/*//////////////////////////////////////////////////////////////
                            Pause Management
    //////////////////////////////////////////////////////////////*/

/// @dev Triggers stopped state. Contract must not be paused.
    function pause() external onlyRole(LRTConstants.PAUSER_ROLE) {
        _pause();
    }

/// @dev Returns to normal state. Contract must be paused.
    function unpause() external onlyLRTAdmin {
        _unpause();
    }

/*//////////////////////////////////////////////////////////////
                            Admin Functions
    //////////////////////////////////////////////////////////////*/

/// @notice Sets the custody address for recovered funds
    /// @param newCustodyAddress The new custody address
    function setCustodyAddress(address newCustodyAddress) external onlyLRTAdmin {
        _setCustodyAddress(newCustodyAddress);
    }

/// @notice Recover the entire balance from a currently blocked, non-exempt address to a designated custody address
    /// @dev Only callable by LRT admin. Works only while the block is active.
    ///      Emits {FrozenFundsRecovered} even if the recovered amount is zero (for transparency and completeness).
    function recoverFrozenFunds(address from) external onlyLRTAdmin {
        UtilLib.checkNonZeroAddress(from);
        UtilLib.checkNonZeroAddress(custodyAddress);

if (isPermanentlyExempt[from]) revert AddressPermanentlyExempt(from);

uint256 blockedUntil = transfersBlockedUntil[from];
        if (blockedUntil == 0 || block.timestamp >= blockedUntil) revert NoActiveTransferBlock(from);

uint256 accountBalance = balanceOf(from);

// Bypass transfer block enforcement when transferring to custody address
        super._transfer(from, custodyAddress, accountBalance);
        emit FrozenFundsRecovered(from, custodyAddress, accountBalance);
    }

/*//////////////////////////////////////////////////////////////
                            Mint & Burn
    //////////////////////////////////////////////////////////////*/

/*//////////////////////////////////////////////////////////////
                            View Functions
    //////////////////////////////////////////////////////////////*/

/// @notice Returns the aligned start timestamp of the effective current 24-hour minting period, accounting for any
    /// possibly skipped days
    /// @return uint256 The start timestamp of the effective current 24-hour period
    function getCurrentPeriodStartTime() public view returns (uint256) {
        // Calculate the full (complete) days elapsed since the period start time (floors the result)
        uint256 daysElapsed = (block.timestamp - periodStartTime) / 1 days;
        return periodStartTime + daysElapsed * 1 days;
    }

/// @notice Gets the remaining daily minting limit
    /// @return uint256 The remaining daily minting limit
    function remainingDailyMintLimit() external view returns (uint256) {
        if (maxMintAmountPerDay == 0) return 0;

// If we're on a new day but no mint has occurred yet, treat currentPeriodMintedAmount as 0
        uint256 effectiveDailyMintAmount = (block.timestamp >= periodStartTime + 1 days) ? 0 : currentPeriodMintedAmount;

return maxMintAmountPerDay > effectiveDailyMintAmount ? maxMintAmountPerDay - effectiveDailyMintAmount : 0;
    }

/// @notice Returns the timestamp at which the current effective daily minting period ends,
    /// accounting for any skipped days during which no minting occurred
    /// @dev A mint executed at exactly this timestamp is counted towards the next period's minting limit
    /// @return uint256 The timestamp at which the effective current minting period ends
    function getNextDailyLimitResetTimestamp() external view returns (uint256) {
        return getCurrentPeriodStartTime() + 1 days;
    }

/*//////////////////////////////////////////////////////////////
                            Internal Functions
    //////////////////////////////////////////////////////////////*/

/// @dev Override ERC20 `_transfer` to enforce transfer blocks on `from` and `to` addresses
    function _transfer(address from, address to, uint256 amount) internal override {
        _enforceNotBlocked(from);
        _enforceNotBlocked(to);
        super._transfer(from, to, amount);
    }

/// @dev Reverts if `account` is currently blocked (used for transfers, mints, and burns)
    function _enforceNotBlocked(address account) internal {
        // Addresses that are permanently exempt can never be blocked
        if (isPermanentlyExempt[account]) return;

// Check if the account has an active transfer block
        uint256 blockedUntil = transfersBlockedUntil[account];
        if (blockedUntil == 0) return;

if (block.timestamp < blockedUntil) revert TransfersBlocked(account, blockedUntil);

// Auto-clean up expired block
        delete transfersBlockedUntil[account];
    }

/// @dev Internal function to set the custody address
    function _setCustodyAddress(address newCustodyAddress) internal {
        UtilLib.checkNonZeroAddress(newCustodyAddress);
        custodyAddress = newCustodyAddress;
        emit CustodyAddressUpdated(newCustodyAddress);
    }
}