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0x7cbec64D099D49eA91062746B38182455c94862C

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Register9876182025-03-17 12:56:2336 days ago1742216183IN
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Register9874602025-03-17 12:07:2336 days ago1742213243IN
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Register9874522025-03-17 12:05:1136 days ago1742213111IN
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Register9874472025-03-17 12:02:5936 days ago1742212979IN
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Register9874412025-03-17 12:01:2336 days ago1742212883IN
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Register9874362025-03-17 11:59:2336 days ago1742212763IN
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Register9874202025-03-17 11:54:4736 days ago1742212487IN
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Register9874202025-03-17 11:54:4736 days ago1742212487IN
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Register9874202025-03-17 11:54:4736 days ago1742212487IN
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Register9874202025-03-17 11:54:4736 days ago1742212487IN
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Register9874202025-03-17 11:54:4736 days ago1742212487IN
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Register9874202025-03-17 11:54:4736 days ago1742212487IN
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Register9874122025-03-17 11:52:3536 days ago1742212355IN
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Register9874122025-03-17 11:52:3536 days ago1742212355IN
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Register9874122025-03-17 11:52:3536 days ago1742212355IN
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Register9874102025-03-17 11:52:2336 days ago1742212343IN
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Register9874102025-03-17 11:52:2336 days ago1742212343IN
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0 ETH0.000005270.1000001
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Register9874052025-03-17 11:50:5936 days ago1742212259IN
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0 ETH0.000005270.1000002
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0 ETH0.000005270.1000001
Register9874042025-03-17 11:50:2336 days ago1742212223IN
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0 ETH0.000005270.1000002
Register9874042025-03-17 11:50:2336 days ago1742212223IN
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0 ETH0.000005270.1000002
Register9874042025-03-17 11:50:2336 days ago1742212223IN
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Contract Source Code Verified (Exact Match)

Contract Name:
EventRegister

Compiler Version
v0.8.24+commit.e11b9ed9

Optimization Enabled:
Yes with 200 runs

Other Settings:
cancun EvmVersion
File 1 of 9 : EventRegister.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24.0;

import { Ownable2StepUpgradeable } from
    "@openzeppelin/contracts-upgradeable/access/Ownable2StepUpgradeable.sol";
import { AccessControlUpgradeable } from
    "@openzeppelin/contracts-upgradeable/access/AccessControlUpgradeable.sol";
/**
 * @title EventRegister
 * @notice A contract that allows authorized managers to create events, manage user registrations,
 *         and track user participation using role-based access control.
 * @dev Utilizes OpenZeppelin's AccessControl for role management. The contract does not hold any
 * Ether.
 */

contract EventRegister is Ownable2StepUpgradeable, AccessControlUpgradeable {
    /**
     * @dev The role identifier for event managers. This role allows accounts to create events
     *      and manage registrations.
     */
    bytes32 public constant EVENT_MANAGER_ROLE = keccak256("EVENT_MANAGER_ROLE");

    /**
     * @dev Represents an event with its associated details.
     */
    struct Event {
        ///< Unique identifier for the event.
        uint256 id;
        ///< Name of the event.
        string name;
        ///< Flag indicating whether the event exists.
        bool exists;
        ///< Flag indicating whether registrations are open for the event.
        bool registrationOpen;
    }

    /**
     * @dev Mapping from event ID to Event details.
     */
    mapping(uint256 eventId => Event eventData) public events;

    /**
     * @dev Mapping from event ID to a mapping of user addresses to their registration status.
     *      Indicates whether a user has registered for a specific event.
     */
    mapping(uint256 eventId => mapping(address registrant => bool isRegistered)) public isRegistered;

    /**
     * @dev Emitted when a new event is created.
     * @param id The unique identifier of the created event.
     * @param name The name of the created event.
     */
    event EventCreated(uint256 id, string name);

    /**
     * @dev Emitted when a user registers for an event.
     * @param registrant The address of the user who registered.
     * @param eventId The unique identifier of the event for which the user registered.
     */
    event Registered(address indexed registrant, uint256 eventId);

    /**
     * @dev Emitted when a user unregisters for an event.
     * @param registrant The address of the user who unregistered.
     * @param eventId The unique identifier of the event for which the user unregistered.
     */
    event Unregistered(address indexed registrant, uint256 eventId);

    /**
     * @dev Emitted when registrations are opened for an event.
     * @param eventId The unique identifier of the event whose registrations are opened.
     */
    event RegistrationOpened(uint256 eventId);

    /**
     * @dev Emitted when registrations are closed for an event.
     * @param eventId The unique identifier of the event whose registrations are closed.
     */
    event RegistrationClosed(uint256 eventId);

    /**
     * @dev Counter for assigning unique event IDs.
     */
    uint256 private nextEventId;

    /**
     * @notice Contract initializer
     * @dev Initializes the contract by granting the deployer the default admin role.
     *    The deployer is also granted the EVENT_MANAGER_ROLE.
     *    The deployer is set as the owner of the contract.
     */
    function initialize() external initializer {
        __Context_init();
        _grantRole(EVENT_MANAGER_ROLE, _msgSender());
        _transferOwnership(_msgSender());
    }

    /**
     * @notice Initializes the contract by granting the deployer the default admin role.
     * @dev The deployer of the contract is granted the DEFAULT_ADMIN_ROLE, allowing them to manage
     * roles.
     */
    constructor() {
        _grantRole(DEFAULT_ADMIN_ROLE, _msgSender());
    }

    /**
     * @notice Grants the EVENT_MANAGER_ROLE to a specified account.
     * @dev Only accounts with the DEFAULT_ADMIN_ROLE can call this function.
     * @param account The address to be granted the EVENT_MANAGER_ROLE.
     *
     * Requirements:
     *
     * - The caller must have the DEFAULT_ADMIN_ROLE.
     */
    function grantEventManagerRole(address account) external onlyRole(DEFAULT_ADMIN_ROLE) {
        grantRole(EVENT_MANAGER_ROLE, account);
    }

    /**
     * @notice Revokes the EVENT_MANAGER_ROLE from a specified account.
     * @dev Only accounts with the DEFAULT_ADMIN_ROLE can call this function.
     * @param account The address from which the EVENT_MANAGER_ROLE will be revoked.
     *
     * Requirements:
     *
     * - The caller must have the DEFAULT_ADMIN_ROLE.
     */
    function revokeEventManagerRole(address account) external onlyRole(DEFAULT_ADMIN_ROLE) {
        revokeRole(EVENT_MANAGER_ROLE, account);
    }

    /**
     * @notice Creates a new event with the given name.
     * @dev Only accounts with the EVENT_MANAGER_ROLE can call this function.
     *      Emits EventCreated and RegistrationOpened events upon successful creation.
     * @param _name The name of the event to be created.
     *
     * Requirements:
     *
     * - The caller must have the EVENT_MANAGER_ROLE.
     */
    function createEvent(string memory _name) external onlyRole(EVENT_MANAGER_ROLE) {
        uint256 eventId = nextEventId;
        events[eventId] = Event({ id: eventId, name: _name, exists: true, registrationOpen: true });
        emit EventCreated(eventId, _name);
        emit RegistrationOpened(eventId); // Emit event indicating registrations are open
        nextEventId++;
    }

    /**
     * @notice Opens registrations for a specific event.
     * @dev Only accounts with the EVENT_MANAGER_ROLE can call this function.
     *      Emits a RegistrationOpened event upon successful operation.
     * @param _eventId The unique identifier of the event for which to open registrations.
     *
     * Requirements:
     *
     * - The event with `_eventId` must exist.
     * - Registrations for the event must currently be closed.
     * - The caller must have the EVENT_MANAGER_ROLE.
     */
    function openRegistration(uint256 _eventId) external onlyRole(EVENT_MANAGER_ROLE) {
        require(events[_eventId].exists, "Event not found");
        require(!events[_eventId].registrationOpen, "Already open");

        events[_eventId].registrationOpen = true;
        emit RegistrationOpened(_eventId);
    }

    /**
     * @notice Closes registrations for a specific event.
     * @dev Only accounts with the EVENT_MANAGER_ROLE can call this function.
     *      Emits a RegistrationClosed event upon successful operation.
     * @param _eventId The unique identifier of the event for which to close registrations.
     *
     * Requirements:
     *
     * - The event with `_eventId` must exist.
     * - Registrations for the event must currently be open.
     * - The caller must have the EVENT_MANAGER_ROLE.
     */
    function closeRegistration(uint256 _eventId) external onlyRole(EVENT_MANAGER_ROLE) {
        require(events[_eventId].exists, "Event not found");
        require(events[_eventId].registrationOpen, "Already closed");

        events[_eventId].registrationOpen = false;
        emit RegistrationClosed(_eventId);
    }

    /**
     * @notice Allows a user to register for a specific event.
     * @dev Emits a Registered event upon successful registration.
     * @param _eventId The unique identifier of the event to register for.
     *
     * Requirements:
     *
     * - The event with `_eventId` must exist.
     * - Registrations for the event must be open.
     * - The caller must not have already registered for the event.
     */
    function register(uint256 _eventId) external {
        Event memory currentEvent = events[_eventId];
        require(currentEvent.exists, "Event not found");
        require(currentEvent.registrationOpen, "Registrations closed");
        require(!isRegistered[_eventId][msg.sender], "Already registered");

        isRegistered[_eventId][msg.sender] = true;

        emit Registered(msg.sender, _eventId);
    }

    /**
     * @notice Allows the event manager to unregister a user from a specific event.
     * @dev Emits an Unregistered event upon successful un-registration.
     * @param _eventId The unique identifier of the event to unregister from.
     * @param _user The address of the user to unregister.
     *
     * Requirements:
     * - The event with `_eventId` must exist.
     * - Registrations for the event must be open.
     * - The user must be registered for the event.
     */
    function unregister(uint256 _eventId, address _user) external onlyRole(EVENT_MANAGER_ROLE) {
        Event memory currentEvent = events[_eventId];
        require(currentEvent.exists, "Event not found");
        require(currentEvent.registrationOpen, "Registrations closed");
        require(isRegistered[_eventId][_user], "Not registered");

        isRegistered[_eventId][_user] = false;
        emit Unregistered(_user, _eventId);
    }

    /**
     * @notice Retrieves all event IDs for which a user has registered.
     * @dev Iterates through all existing events to compile a list of registrations.
     * @param _user The address of the user whose registrations are to be retrieved.
     * @return An array of event IDs that the user has registered for.
     *
     */
    function getRegisteredEvents(address _user) external view returns (uint256[] memory) {
        uint256[] memory temp = new uint256[](nextEventId);
        uint256 count = 0;

        for (uint256 i = 0; i < nextEventId; i++) {
            if (isRegistered[i][_user]) {
                temp[count] = i;
                count++;
            }
        }

        // Create a fixed-size array to return
        uint256[] memory registeredEvents = new uint256[](count);
        for (uint256 j = 0; j < count; j++) {
            registeredEvents[j] = temp[j];
        }

        return registeredEvents;
    }

    /**
     * @notice Retrieves the details of a specific event.
     * @dev Returns the event's ID, name, and registration status.
     * @param _eventId The unique identifier of the event to retrieve.
     * @return id The unique identifier of the event.
     * @return name The name of the event.
     * @return registrationOpen_ A boolean indicating whether registrations are open for the event.
     *
     * Requirements:
     *
     * - The event with `_eventId` must exist.
     */
    function getEvent(uint256 _eventId)
        external
        view
        returns (uint256 id, string memory name, bool registrationOpen_)
    {
        require(events[_eventId].exists, "Event not found");
        Event memory e = events[_eventId];
        return (e.id, e.name, e.registrationOpen);
    }
}

File 2 of 9 : Ownable2StepUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.20;

import {OwnableUpgradeable} from "./OwnableUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is specified at deployment time in the constructor for `Ownable`. This
 * can later be changed with {transferOwnership} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2StepUpgradeable is Initializable, OwnableUpgradeable {
    /// @custom:storage-location erc7201:openzeppelin.storage.Ownable2Step
    struct Ownable2StepStorage {
        address _pendingOwner;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Ownable2Step")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant Ownable2StepStorageLocation = 0x237e158222e3e6968b72b9db0d8043aacf074ad9f650f0d1606b4d82ee432c00;

    function _getOwnable2StepStorage() private pure returns (Ownable2StepStorage storage $) {
        assembly {
            $.slot := Ownable2StepStorageLocation
        }
    }

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

    function __Ownable2Step_init() internal onlyInitializing {
    }

    function __Ownable2Step_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        Ownable2StepStorage storage $ = _getOwnable2StepStorage();
        return $._pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        Ownable2StepStorage storage $ = _getOwnable2StepStorage();
        $._pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        Ownable2StepStorage storage $ = _getOwnable2StepStorage();
        delete $._pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() public virtual {
        address sender = _msgSender();
        if (pendingOwner() != sender) {
            revert OwnableUnauthorizedAccount(sender);
        }
        _transferOwnership(sender);
    }
}

File 3 of 9 : AccessControlUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/AccessControl.sol)

pragma solidity ^0.8.20;

import {IAccessControl} from "@openzeppelin/contracts/access/IAccessControl.sol";
import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {ERC165Upgradeable} from "../utils/introspection/ERC165Upgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControlUpgradeable is Initializable, ContextUpgradeable, IAccessControl, ERC165Upgradeable {
    struct RoleData {
        mapping(address account => bool) hasRole;
        bytes32 adminRole;
    }

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;


    /// @custom:storage-location erc7201:openzeppelin.storage.AccessControl
    struct AccessControlStorage {
        mapping(bytes32 role => RoleData) _roles;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.AccessControl")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant AccessControlStorageLocation = 0x02dd7bc7dec4dceedda775e58dd541e08a116c6c53815c0bd028192f7b626800;

    function _getAccessControlStorage() private pure returns (AccessControlStorage storage $) {
        assembly {
            $.slot := AccessControlStorageLocation
        }
    }

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with an {AccessControlUnauthorizedAccount} error including the required role.
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

    function __AccessControl_init() internal onlyInitializing {
    }

    function __AccessControl_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IAccessControl).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        return $._roles[role].hasRole[account];
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `_msgSender()`
     * is missing `role`. Overriding this function changes the behavior of the {onlyRole} modifier.
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `account`
     * is missing `role`.
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert AccessControlUnauthorizedAccount(account, role);
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual returns (bytes32) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        return $._roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address callerConfirmation) public virtual {
        if (callerConfirmation != _msgSender()) {
            revert AccessControlBadConfirmation();
        }

        _revokeRole(role, callerConfirmation);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        AccessControlStorage storage $ = _getAccessControlStorage();
        bytes32 previousAdminRole = getRoleAdmin(role);
        $._roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Attempts to grant `role` to `account` and returns a boolean indicating if `role` was granted.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        if (!hasRole(role, account)) {
            $._roles[role].hasRole[account] = true;
            emit RoleGranted(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Attempts to revoke `role` to `account` and returns a boolean indicating if `role` was revoked.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual returns (bool) {
        AccessControlStorage storage $ = _getAccessControlStorage();
        if (hasRole(role, account)) {
            $._roles[role].hasRole[account] = false;
            emit RoleRevoked(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }
}

File 4 of 9 : OwnableUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {ContextUpgradeable} from "../utils/ContextUpgradeable.sol";
import {Initializable} from "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    /// @custom:storage-location erc7201:openzeppelin.storage.Ownable
    struct OwnableStorage {
        address _owner;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Ownable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant OwnableStorageLocation = 0x9016d09d72d40fdae2fd8ceac6b6234c7706214fd39c1cd1e609a0528c199300;

    function _getOwnableStorage() private pure returns (OwnableStorage storage $) {
        assembly {
            $.slot := OwnableStorageLocation
        }
    }

    /**
     * @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.
     */
    function __Ownable_init(address initialOwner) internal onlyInitializing {
        __Ownable_init_unchained(initialOwner);
    }

    function __Ownable_init_unchained(address initialOwner) internal onlyInitializing {
        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) {
        OwnableStorage storage $ = _getOwnableStorage();
        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 {
        OwnableStorage storage $ = _getOwnableStorage();
        address oldOwner = $._owner;
        $._owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

File 5 of 9 : Initializable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.20;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```solidity
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 *
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Storage of the initializable contract.
     *
     * It's implemented on a custom ERC-7201 namespace to reduce the risk of storage collisions
     * when using with upgradeable contracts.
     *
     * @custom:storage-location erc7201:openzeppelin.storage.Initializable
     */
    struct InitializableStorage {
        /**
         * @dev Indicates that the contract has been initialized.
         */
        uint64 _initialized;
        /**
         * @dev Indicates that the contract is in the process of being initialized.
         */
        bool _initializing;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.Initializable")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant INITIALIZABLE_STORAGE = 0xf0c57e16840df040f15088dc2f81fe391c3923bec73e23a9662efc9c229c6a00;

    /**
     * @dev The contract is already initialized.
     */
    error InvalidInitialization();

    /**
     * @dev The contract is not initializing.
     */
    error NotInitializing();

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint64 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that in the context of a constructor an `initializer` may be invoked any
     * number of times. This behavior in the constructor can be useful during testing and is not expected to be used in
     * production.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        // Cache values to avoid duplicated sloads
        bool isTopLevelCall = !$._initializing;
        uint64 initialized = $._initialized;

        // Allowed calls:
        // - initialSetup: the contract is not in the initializing state and no previous version was
        //                 initialized
        // - construction: the contract is initialized at version 1 (no reininitialization) and the
        //                 current contract is just being deployed
        bool initialSetup = initialized == 0 && isTopLevelCall;
        bool construction = initialized == 1 && address(this).code.length == 0;

        if (!initialSetup && !construction) {
            revert InvalidInitialization();
        }
        $._initialized = 1;
        if (isTopLevelCall) {
            $._initializing = true;
        }
        _;
        if (isTopLevelCall) {
            $._initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: Setting the version to 2**64 - 1 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint64 version) {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing || $._initialized >= version) {
            revert InvalidInitialization();
        }
        $._initialized = version;
        $._initializing = true;
        _;
        $._initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        _checkInitializing();
        _;
    }

    /**
     * @dev Reverts if the contract is not in an initializing state. See {onlyInitializing}.
     */
    function _checkInitializing() internal view virtual {
        if (!_isInitializing()) {
            revert NotInitializing();
        }
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        // solhint-disable-next-line var-name-mixedcase
        InitializableStorage storage $ = _getInitializableStorage();

        if ($._initializing) {
            revert InvalidInitialization();
        }
        if ($._initialized != type(uint64).max) {
            $._initialized = type(uint64).max;
            emit Initialized(type(uint64).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint64) {
        return _getInitializableStorage()._initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _getInitializableStorage()._initializing;
    }

    /**
     * @dev Returns a pointer to the storage namespace.
     */
    // solhint-disable-next-line var-name-mixedcase
    function _getInitializableStorage() private pure returns (InitializableStorage storage $) {
        assembly {
            $.slot := INITIALIZABLE_STORAGE
        }
    }
}

File 6 of 9 : IAccessControl.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/IAccessControl.sol)

pragma solidity ^0.8.20;

/**
 * @dev External interface of AccessControl declared to support ERC165 detection.
 */
interface IAccessControl {
    /**
     * @dev The `account` is missing a role.
     */
    error AccessControlUnauthorizedAccount(address account, bytes32 neededRole);

    /**
     * @dev The caller of a function is not the expected one.
     *
     * NOTE: Don't confuse with {AccessControlUnauthorizedAccount}.
     */
    error AccessControlBadConfirmation();

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {AccessControl-_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     */
    function renounceRole(bytes32 role, address callerConfirmation) external;
}

File 7 of 9 : ContextUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;
import {Initializable} from "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

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

File 8 of 9 : ERC165Upgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

import {IERC165} from "@openzeppelin/contracts/utils/introspection/IERC165.sol";
import {Initializable} from "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165Upgradeable is Initializable, IERC165 {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 9 of 9 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * 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[EIP 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);
}

Settings
{
  "remappings": [
    "@openzeppelin/contracts-upgradeable/=node_modules/@openzeppelin/contracts-upgradeable/",
    "@openzeppelin/contracts/=node_modules/@openzeppelin/contracts/",
    "solady/=node_modules/solady/",
    "forge-std/=node_modules/forge-std/",
    "ds-test/=node_modules/ds-test/src/",
    "p256-verifier/=node_modules/p256-verifier/",
    "murky/=node_modules/murky/src/",
    "solidity-stringutils/=node_modules/solidity-stringutils/",
    "@taiko/blacklist/=node_modules/@taiko/supplementary-contracts/contracts/blacklist/",
    "openzeppelin-foundry-upgrades/=node_modules/openzeppelin-foundry-upgrades/src/",
    "hardhat/=node_modules/hardhat/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "cancun",
  "viaIR": false,
  "libraries": {}
}

Contract Security Audit

Contract ABI

API
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.