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Contract Source Code Verified (Exact Match)

Contract Name:
Anyrand

Compiler Version
v0.8.28+commit.7893614a

Optimization Enabled:
Yes with 1000 runs

Other Settings:
paris EvmVersion

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 17 : Anyrand.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;

import {Ownable} from "solady/src/auth/Ownable.sol";
import {ReentrancyGuardUpgradeable} from "@openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol";
import {UUPSUpgradeable} from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import {Gas} from "./lib/Gas.sol";
import {ITypeAndVersion} from "./interfaces/ITypeAndVersion.sol";
import {IRandomiserCallbackV3} from "./interfaces/IRandomiserCallbackV3.sol";
import {AnyrandStorage} from "./AnyrandStorage.sol";
import {IGasStation} from "./interfaces/IGasStation.sol";
import {IDrandBeacon} from "./interfaces/IDrandBeacon.sol";

/// @title Anyrand
/// @author Kevin Charm ([email protected])
/// @notice Coordinator for requesting and receiving verified randomness from
///     a drand (https://drand.love) beacon.
contract Anyrand is
    AnyrandStorage,
    ITypeAndVersion,
    Ownable,
    UUPSUpgradeable,
    ReentrancyGuardUpgradeable
{
    constructor() {
        _disableInitializers();
    }

    /// @notice Initialise the contract
    /// @param beacon_ The address of contract with drand beacon data
    /// @param requestPremiumMultiplierBps_ The percentage multiplier applied
    ///     to the raw tx cost
    /// @param maxCallbackGasLimit_ The maximum callback gas limit
    /// @param maxDeadlineDelta_ The maximum deadline delta
    /// @param gasStation_ The address of the gas station
    /// @param maxFeePerGas_ The maximum effective fee per gas for requests
    function init(
        address beacon_,
        uint256 requestPremiumMultiplierBps_,
        uint256 maxCallbackGasLimit_,
        uint256 maxDeadlineDelta_,
        address gasStation_,
        uint256 maxFeePerGas_
    ) public initializer {
        __UUPSUpgradeable_init();
        // solady/auth/Ownable requires explicit initialisation
        _initializeOwner(msg.sender);

        MainStorage storage $ = _getMainStorage();

        _setBeacon(beacon_);

        $.nextRequestId = 1;

        $.requestPremiumMultiplierBps = requestPremiumMultiplierBps_;
        emit RequestPremiumMultiplierUpdated(requestPremiumMultiplierBps_);

        $.maxCallbackGasLimit = maxCallbackGasLimit_;
        emit MaxCallbackGasLimitUpdated(maxCallbackGasLimit_);

        $.maxDeadlineDelta = maxDeadlineDelta_;
        emit MaxDeadlineDeltaUpdated(maxDeadlineDelta_);

        $.gasStation = gasStation_;
        emit GasStationUpdated(gasStation_);

        $.maxFeePerGas = maxFeePerGas_;
        emit MaxFeePerGasUpdated(maxFeePerGas_);
    }

    /// @inheritdoc UUPSUpgradeable
    function _authorizeUpgrade(
        address newImplementation
    ) internal override onlyOwner {}

    /// @notice See {ITypeAndVersion-typeAndVersion}
    function typeAndVersion() external pure returns (string memory) {
        return "Anyrand 1.0.0";
    }

    /// @notice Compute keccak256 of a request
    /// @param requestId Request id, acts as a nonce
    /// @param requester Address of contract that initiated the request.
    /// @param pubKeyHash hash of the beacon's public key
    /// @param round Target round of the drand beacon.
    /// @param callbackGasLimit Gas limit for callback
    function _hashRequest(
        uint256 requestId,
        address requester,
        bytes32 pubKeyHash,
        uint256 round,
        uint256 callbackGasLimit
    ) internal view returns (bytes32) {
        return
            keccak256(
                abi.encode(
                    block.chainid,
                    address(this),
                    requestId,
                    requester,
                    pubKeyHash,
                    round,
                    callbackGasLimit
                )
            );
    }

    /// @notice Withdraw ETH
    /// @param amount Amount of ETH (in wei) to withdraw. Input 0
    ///     to withdraw entire balance
    function withdrawETH(uint256 amount) external onlyOwner {
        if (amount == 0) {
            amount = address(this).balance;
        }
        (bool success, ) = msg.sender.call{value: amount}("");
        if (!success) {
            revert TransferFailed(msg.sender, amount);
        }
        emit ETHWithdrawn(amount);
    }

    /// @notice Compute the total request price.
    /// @notice NB: The gas calculation uses `tx.gasprice`, so gas prices must
    ///     be explicitly specified if calling this function statically!
    ///     Calling this function from a block explorer will give an incorrect
    ///     price.
    /// @param callbackGasLimit The callback gas limit that will be used for
    ///     the randomness request
    function getRequestPrice(
        uint256 callbackGasLimit
    ) public view virtual returns (uint256, uint256) {
        MainStorage storage $ = _getMainStorage();
        (uint256 rawTxCost, uint256 effectiveFeePerGas) = IGasStation(
            $.gasStation
        ).getTxCost(
                200_000 /** fulfillRandomness overhead */ + callbackGasLimit
            );
        uint256 totalCost = (rawTxCost * $.requestPremiumMultiplierBps) / 1e4;
        if (effectiveFeePerGas > $.maxFeePerGas) {
            // Cap gas price at maxFeePerGas (keeper will only fulfill when gas
            // price <= maxFeePerGas)
            // Importantly, fulfilment is permissionless, so it's possible to
            // override this behaviour and fulfill randomness even when the
            // keeper refuses to.
            totalCost = $.maxFeePerGas * callbackGasLimit;
            effectiveFeePerGas = $.maxFeePerGas;
        }
        return (totalCost, effectiveFeePerGas);
    }

    /// @notice Compute the drand beacon round given a genesis timestamp,
    ///     deadline and period.
    /// @param genesis The genesis timestamp of the drand beacon
    /// @param deadline The deadline timestamp after which the randomness will
    ///     be available
    /// @param period The period of the drand beacon
    function getRound(
        uint256 genesis,
        uint256 deadline,
        uint256 period
    ) public pure returns (uint64) {
        uint256 delta = deadline - genesis;
        return uint64(delta / period + (delta % period > 0 ? 1 : 0));
    }

    /// @notice Request randomness. Note that the fulfilment of the request will
    ///     always be *after* the deadline, but never before.
    /// @param deadline Timestamp of when the randomness should be fulfilled. A
    ///     beacon round closest to this timestamp (rounding up to the nearest
    ///     future round) will be used as the round from which to derive
    ///     randomness.
    /// @param callbackGasLimit Gas limit for callback
    function requestRandomness(
        uint256 deadline,
        uint256 callbackGasLimit
    ) external payable override nonReentrant returns (uint256) {
        // Compute the total request price (including the premium) that will be
        // used to cover the keeper's costs
        (uint256 reqPrice, uint256 effectiveFeePerGas) = getRequestPrice(
            callbackGasLimit
        );
        if (msg.value != reqPrice) {
            revert IncorrectPayment(msg.value, reqPrice);
        }

        MainStorage storage $ = _getMainStorage();
        if (callbackGasLimit > $.maxCallbackGasLimit) {
            revert OverGasLimit(callbackGasLimit);
        }

        bytes32 pubKeyHash = $.currentBeaconPubKeyHash;
        // Here we find the nearest round
        uint64 round;
        {
            IDrandBeacon drandBeacon = IDrandBeacon($.beacons[pubKeyHash]);
            pubKeyHash = drandBeacon.publicKeyHash();
            uint256 genesis = drandBeacon.genesisTimestamp();
            uint256 period = drandBeacon.period();
            if (
                (deadline > block.timestamp + $.maxDeadlineDelta) ||
                (deadline < genesis) ||
                deadline < (block.timestamp + period)
            ) {
                revert InvalidDeadline(deadline);
            }
            // Calculate nearest round from deadline (rounding to the future)
            round = getRound(genesis, deadline, period);
        }

        // Record the commitment of this request
        uint256 requestId = $.nextRequestId++;
        assert($.requestStates[requestId] == RequestState.Nonexistent);
        $.requestStates[requestId] = RequestState.Pending;
        $.requests[requestId] = _hashRequest(
            requestId,
            msg.sender,
            pubKeyHash,
            round,
            callbackGasLimit
        );

        emit RandomnessRequested(
            requestId,
            msg.sender,
            pubKeyHash,
            round,
            callbackGasLimit,
            reqPrice,
            effectiveFeePerGas
        );

        return requestId;
    }

    /// @notice Call a function, forwarding an exact amount of gas, whilst also
    ///     measuring how much gas was actually used.
    /// @param callbackGasLimit The amount of gas to use
    /// @param target The address to call
    /// @param data The data to send
    /// @return success Whether the call succeeded
    /// @return gasUsed The amount of gas used
    function _callWithExactGas(
        uint256 callbackGasLimit,
        address target,
        bytes memory data
    ) private returns (bool success, uint256 gasUsed) {
        gasUsed = gasleft();
        success = Gas.callWithExactGas(callbackGasLimit, target, data);
        gasUsed -= gasleft();
    }

    /// @notice Fulfill a randomness request (for beacon keepers).
    /// @notice Note that fulfilment only depends on the validity of the BLS
    ///     signature over the expected beacon round, and DOES NOT check
    ///     the block timestamp against that round.
    /// @param requestId Which request id to fulfill
    /// @param requester Address of account that initiated the request.
    /// @param round Target round of the drand beacon.
    /// @param callbackGasLimit Gas limit for callback
    /// @param signature Beacon signature of the round, from which randomness
    ///     is derived.
    function fulfillRandomness(
        uint256 requestId,
        address requester,
        bytes32 pubKeyHash,
        uint256 round,
        uint256 callbackGasLimit,
        uint256[2] calldata signature
    ) external nonReentrant {
        MainStorage storage $ = _getMainStorage();

        // Ensure the request is in the correct state
        if ($.requestStates[requestId] != RequestState.Pending) {
            revert InvalidRequestState($.requestStates[requestId]);
        }

        // The inputs provided by the keeper must match the commitment we
        // recorded when the request was made.
        bytes32 reqHash = _hashRequest(
            requestId,
            requester,
            pubKeyHash,
            round,
            callbackGasLimit
        );
        if ($.requests[requestId] != reqHash) {
            revert InvalidRequestHash(reqHash);
        }

        // Nullify the request hash; fulfilments must never be replayable
        $.requests[requestId] = bytes32(0);

        // Beacon verification: we check that the signature over the round is
        // valid for the given pubkey.
        IDrandBeacon($.beacons[pubKeyHash]).verifyBeaconRound(round, signature);

        // Derive randomness from the signature
        uint256 randomness = uint256(
            keccak256(
                abi.encode(
                    signature[0] /** entropy */,
                    signature[1] /** entropy */,
                    block.chainid /** domain separator */,
                    address(this) /** salt */,
                    requestId /** salt */,
                    requester /** salt */
                )
            )
        );

        (bool didCallbackSucceed, uint256 gasUsed) = _callWithExactGas(
            callbackGasLimit,
            requester,
            abi.encodePacked(
                IRandomiserCallbackV3.receiveRandomness.selector,
                abi.encode(requestId, randomness)
            )
        );
        if (!didCallbackSucceed) {
            // The following code is to help debug any issues that occur in the
            // case that the callback fails.
            bytes32 retdata;
            assembly {
                function min(a, b) -> c {
                    switch lt(a, b)
                    case 1 {
                        c := a
                    }
                    default {
                        c := b
                    }
                }

                mstore(0, 0)
                // Copy a maximum of 32B from returndata, to ease debugging
                let r := returndatasize()
                returndatacopy(0, 0, min(r, 32))
                retdata := mload(0)
            }
            emit RandomnessCallbackFailed(
                requestId,
                retdata,
                callbackGasLimit,
                gasUsed
            );
            $.requestStates[requestId] = RequestState.Failed;
        } else {
            $.requestStates[requestId] = RequestState.Fulfilled;
        }

        emit RandomnessFulfilled(
            requestId,
            randomness,
            didCallbackSucceed,
            gasUsed
        );
    }

    /// @notice Get the state of a request
    /// @param requestId The request identifier
    function getRequestState(
        uint256 requestId
    ) external view returns (RequestState) {
        MainStorage storage $ = _getMainStorage();
        return $.requestStates[requestId];
    }

    /// @notice Add a new beacon and set the current beacon to it
    /// @param newBeacon The new beacon
    function _setBeacon(address newBeacon) internal {
        // Sanity check
        try IDrandBeacon(newBeacon).publicKeyHash() returns (
            bytes32 pubKeyHash
        ) {
            if (pubKeyHash == bytes32(0) || pubKeyHash == keccak256(hex"")) {
                revert InvalidBeacon(newBeacon);
            }

            // Looks good - add the beacon and update it
            MainStorage storage $ = _getMainStorage();
            $.beacons[pubKeyHash] = newBeacon;
            $.currentBeaconPubKeyHash = pubKeyHash;
            emit BeaconUpdated(newBeacon);
        } catch {
            revert InvalidBeacon(newBeacon);
        }
    }

    ///////////////////////////////////////////////////////////////////////////
    /// Privileged setters ////////////////////////////////////////////////////
    ///////////////////////////////////////////////////////////////////////////

    /// @notice Add a new beacon and set the current beacon to it (privileged)
    /// @notice This is intended to be used only in the case that the evmnet
    ///     beacon is deprecated in favour of the BLS12-381 beacon.
    /// @notice NB: This can replace/fix a beacon that is known to this
    ///     contract by its public key hash.
    /// @param newBeacon The new beacon
    function setBeacon(address newBeacon) external onlyOwner {
        _setBeacon(newBeacon);
    }

    /// @notice Update request price
    /// @param newRequestPremiumMultiplierBps The new request premium multiplier
    function setRequestPremiumMultiplierBps(
        uint256 newRequestPremiumMultiplierBps
    ) external onlyOwner {
        MainStorage storage $ = _getMainStorage();
        $.requestPremiumMultiplierBps = newRequestPremiumMultiplierBps;
        emit RequestPremiumMultiplierUpdated(newRequestPremiumMultiplierBps);
    }

    /// @notice Update max callback gas limit
    /// @param newMaxCallbackGasLimit The new max callback gas limit
    function setMaxCallbackGasLimit(
        uint256 newMaxCallbackGasLimit
    ) external onlyOwner {
        MainStorage storage $ = _getMainStorage();
        $.maxCallbackGasLimit = newMaxCallbackGasLimit;
        emit MaxCallbackGasLimitUpdated(newMaxCallbackGasLimit);
    }

    /// @notice Update max deadline delta
    /// @param newMaxDeadlineDelta The new max deadline delta
    function setMaxDeadlineDelta(
        uint256 newMaxDeadlineDelta
    ) external onlyOwner {
        MainStorage storage $ = _getMainStorage();
        $.maxDeadlineDelta = newMaxDeadlineDelta;
        emit MaxDeadlineDeltaUpdated(newMaxDeadlineDelta);
    }

    /// @notice Set the gas station
    /// @param newGasStation The new gas station
    function setGasStation(address newGasStation) external onlyOwner {
        MainStorage storage $ = _getMainStorage();
        $.gasStation = newGasStation;
        emit GasStationUpdated(newGasStation);
    }
}

File 2 of 17 : 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 3 of 17 : UUPSUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/utils/UUPSUpgradeable.sol)

pragma solidity ^0.8.20;

import {IERC1822Proxiable} from "@openzeppelin/contracts/interfaces/draft-IERC1822.sol";
import {ERC1967Utils} from "@openzeppelin/contracts/proxy/ERC1967/ERC1967Utils.sol";
import {Initializable} from "./Initializable.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822Proxiable {
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    address private immutable __self = address(this);

    /**
     * @dev The version of the upgrade interface of the contract. If this getter is missing, both `upgradeTo(address)`
     * and `upgradeToAndCall(address,bytes)` are present, and `upgradeTo` must be used if no function should be called,
     * while `upgradeToAndCall` will invoke the `receive` function if the second argument is the empty byte string.
     * If the getter returns `"5.0.0"`, only `upgradeToAndCall(address,bytes)` is present, and the second argument must
     * be the empty byte string if no function should be called, making it impossible to invoke the `receive` function
     * during an upgrade.
     */
    string public constant UPGRADE_INTERFACE_VERSION = "5.0.0";

    /**
     * @dev The call is from an unauthorized context.
     */
    error UUPSUnauthorizedCallContext();

    /**
     * @dev The storage `slot` is unsupported as a UUID.
     */
    error UUPSUnsupportedProxiableUUID(bytes32 slot);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        _checkProxy();
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        _checkNotDelegated();
        _;
    }

    function __UUPSUpgradeable_init() internal onlyInitializing {
    }

    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual notDelegated returns (bytes32) {
        return ERC1967Utils.IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     *
     * @custom:oz-upgrades-unsafe-allow-reachable delegatecall
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) public payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data);
    }

    /**
     * @dev Reverts if the execution is not performed via delegatecall or the execution
     * context is not of a proxy with an ERC1967-compliant implementation pointing to self.
     * See {_onlyProxy}.
     */
    function _checkProxy() internal view virtual {
        if (
            address(this) == __self || // Must be called through delegatecall
            ERC1967Utils.getImplementation() != __self // Must be called through an active proxy
        ) {
            revert UUPSUnauthorizedCallContext();
        }
    }

    /**
     * @dev Reverts if the execution is performed via delegatecall.
     * See {notDelegated}.
     */
    function _checkNotDelegated() internal view virtual {
        if (address(this) != __self) {
            // Must not be called through delegatecall
            revert UUPSUnauthorizedCallContext();
        }
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;

    /**
     * @dev Performs an implementation upgrade with a security check for UUPS proxies, and additional setup call.
     *
     * As a security check, {proxiableUUID} is invoked in the new implementation, and the return value
     * is expected to be the implementation slot in ERC1967.
     *
     * Emits an {IERC1967-Upgraded} event.
     */
    function _upgradeToAndCallUUPS(address newImplementation, bytes memory data) private {
        try IERC1822Proxiable(newImplementation).proxiableUUID() returns (bytes32 slot) {
            if (slot != ERC1967Utils.IMPLEMENTATION_SLOT) {
                revert UUPSUnsupportedProxiableUUID(slot);
            }
            ERC1967Utils.upgradeToAndCall(newImplementation, data);
        } catch {
            // The implementation is not UUPS
            revert ERC1967Utils.ERC1967InvalidImplementation(newImplementation);
        }
    }
}

File 4 of 17 : ReentrancyGuardUpgradeable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/ReentrancyGuard.sol)

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

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

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

    /// @custom:storage-location erc7201:openzeppelin.storage.ReentrancyGuard
    struct ReentrancyGuardStorage {
        uint256 _status;
    }

    // keccak256(abi.encode(uint256(keccak256("openzeppelin.storage.ReentrancyGuard")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 private constant ReentrancyGuardStorageLocation = 0x9b779b17422d0df92223018b32b4d1fa46e071723d6817e2486d003becc55f00;

    function _getReentrancyGuardStorage() private pure returns (ReentrancyGuardStorage storage $) {
        assembly {
            $.slot := ReentrancyGuardStorageLocation
        }
    }

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    function __ReentrancyGuard_init() internal onlyInitializing {
        __ReentrancyGuard_init_unchained();
    }

    function __ReentrancyGuard_init_unchained() internal onlyInitializing {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        $._status = NOT_ENTERED;
    }

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

    function _nonReentrantBefore() private {
        ReentrancyGuardStorage storage $ = _getReentrancyGuardStorage();
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if ($._status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

        // Any calls to nonReentrant after this point will fail
        $._status = ENTERED;
    }

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

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

File 5 of 17 : draft-IERC1822.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.20;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822Proxiable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

File 6 of 17 : IBeacon.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.20;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeacon {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {UpgradeableBeacon} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

File 7 of 17 : ERC1967Utils.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (proxy/ERC1967/ERC1967Utils.sol)

pragma solidity ^0.8.20;

import {IBeacon} from "../beacon/IBeacon.sol";
import {Address} from "../../utils/Address.sol";
import {StorageSlot} from "../../utils/StorageSlot.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 */
library ERC1967Utils {
    // We re-declare ERC-1967 events here because they can't be used directly from IERC1967.
    // This will be fixed in Solidity 0.8.21. At that point we should remove these events.
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1.
     */
    // solhint-disable-next-line private-vars-leading-underscore
    bytes32 internal constant IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev The `implementation` of the proxy is invalid.
     */
    error ERC1967InvalidImplementation(address implementation);

    /**
     * @dev The `admin` of the proxy is invalid.
     */
    error ERC1967InvalidAdmin(address admin);

    /**
     * @dev The `beacon` of the proxy is invalid.
     */
    error ERC1967InvalidBeacon(address beacon);

    /**
     * @dev An upgrade function sees `msg.value > 0` that may be lost.
     */
    error ERC1967NonPayable();

    /**
     * @dev Returns the current implementation address.
     */
    function getImplementation() internal view returns (address) {
        return StorageSlot.getAddressSlot(IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        if (newImplementation.code.length == 0) {
            revert ERC1967InvalidImplementation(newImplementation);
        }
        StorageSlot.getAddressSlot(IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Performs implementation upgrade with additional setup call if data is nonempty.
     * This function is payable only if the setup call is performed, otherwise `msg.value` is rejected
     * to avoid stuck value in the contract.
     *
     * Emits an {IERC1967-Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);

        if (data.length > 0) {
            Address.functionDelegateCall(newImplementation, data);
        } else {
            _checkNonPayable();
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1.
     */
    // solhint-disable-next-line private-vars-leading-underscore
    bytes32 internal constant ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     *
     * TIP: To get this value clients can read directly from the storage slot shown below (specified by EIP1967) using
     * the https://eth.wiki/json-rpc/API#eth_getstorageat[`eth_getStorageAt`] RPC call.
     * `0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103`
     */
    function getAdmin() internal view returns (address) {
        return StorageSlot.getAddressSlot(ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        if (newAdmin == address(0)) {
            revert ERC1967InvalidAdmin(address(0));
        }
        StorageSlot.getAddressSlot(ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {IERC1967-AdminChanged} event.
     */
    function changeAdmin(address newAdmin) internal {
        emit AdminChanged(getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is the keccak-256 hash of "eip1967.proxy.beacon" subtracted by 1.
     */
    // solhint-disable-next-line private-vars-leading-underscore
    bytes32 internal constant BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function getBeacon() internal view returns (address) {
        return StorageSlot.getAddressSlot(BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        if (newBeacon.code.length == 0) {
            revert ERC1967InvalidBeacon(newBeacon);
        }

        StorageSlot.getAddressSlot(BEACON_SLOT).value = newBeacon;

        address beaconImplementation = IBeacon(newBeacon).implementation();
        if (beaconImplementation.code.length == 0) {
            revert ERC1967InvalidImplementation(beaconImplementation);
        }
    }

    /**
     * @dev Change the beacon and trigger a setup call if data is nonempty.
     * This function is payable only if the setup call is performed, otherwise `msg.value` is rejected
     * to avoid stuck value in the contract.
     *
     * Emits an {IERC1967-BeaconUpgraded} event.
     *
     * CAUTION: Invoking this function has no effect on an instance of {BeaconProxy} since v5, since
     * it uses an immutable beacon without looking at the value of the ERC-1967 beacon slot for
     * efficiency.
     */
    function upgradeBeaconToAndCall(address newBeacon, bytes memory data) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);

        if (data.length > 0) {
            Address.functionDelegateCall(IBeacon(newBeacon).implementation(), data);
        } else {
            _checkNonPayable();
        }
    }

    /**
     * @dev Reverts if `msg.value` is not zero. It can be used to avoid `msg.value` stuck in the contract
     * if an upgrade doesn't perform an initialization call.
     */
    function _checkNonPayable() private {
        if (msg.value > 0) {
            revert ERC1967NonPayable();
        }
    }
}

File 8 of 17 : Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://consensys.net/diligence/blog/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

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

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

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

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

File 9 of 17 : StorageSlot.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

pragma solidity ^0.8.20;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```solidity
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(newImplementation.code.length > 0);
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` with member `value` located at `slot`.
     */
    function getStringSlot(bytes32 slot) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` with member `value` located at `slot`.
     */
    function getBytesSlot(bytes32 slot) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

File 10 of 17 : AnyrandStorage.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;

import {IAnyrand} from "./interfaces/IAnyrand.sol";

/// @title AnyrandStorage
/// @author Kevin Charm ([email protected])
/// @notice Base abstract contract for Anyrand, defining storage layout and
///     external getter boilerplate.
abstract contract AnyrandStorage is IAnyrand {
    /// @custom:storage-location erc7201:io.frogworks.anyrand.v1.main_storage
    struct MainStorage {
        /// @notice Current beacon public key hash
        bytes32 currentBeaconPubKeyHash;
        /// @notice The multiplier applied to the raw tx cost of fulfilment
        uint256 requestPremiumMultiplierBps;
        /// @notice Maximum callback gas limit
        uint256 maxCallbackGasLimit;
        /// @notice Maximum number of seconds in the future from which randomness
        ///     can be requested
        uint256 maxDeadlineDelta;
        /// @notice Self-explanatory
        uint256 nextRequestId;
        /// @notice Request hashes - see {Anyrand-hashRequest}
        mapping(uint256 requestId => bytes32 requestHash) requests;
        /// @notice Gas station
        address gasStation;
        /// @notice Maximum effective gas price (in wei) for requests
        uint256 maxFeePerGas;
        /// @notice Request states
        mapping(uint256 requestId => RequestState state) requestStates;
        /// @notice Beacons mapped by their public key hash
        mapping(bytes32 pubkeyHash => address beacon) beacons;
    }

    /// @notice Get contract storage
    function _getMainStorage() internal pure returns (MainStorage storage $) {
        assembly {
            // (keccak256("io.frogworks.anyrand.v1.main_storage") - 1) & ~0xff
            $.slot := 0x73bb1f7ad954352194401771e442b57f02df3da05251c4536bf437f932f99200
        }
    }

    function currentBeaconPubKeyHash() external view returns (bytes32) {
        return _getMainStorage().currentBeaconPubKeyHash;
    }

    function beacon(bytes32 pubkeyHash) external view returns (address) {
        return _getMainStorage().beacons[pubkeyHash];
    }

    function requestPremiumMultiplierBps() external view returns (uint256) {
        return _getMainStorage().requestPremiumMultiplierBps;
    }

    function maxCallbackGasLimit() external view returns (uint256) {
        return _getMainStorage().maxCallbackGasLimit;
    }

    function maxDeadlineDelta() external view returns (uint256) {
        return _getMainStorage().maxDeadlineDelta;
    }

    function nextRequestId() external view returns (uint256) {
        return _getMainStorage().nextRequestId;
    }

    function requests(uint256 requestId) external view returns (bytes32) {
        return _getMainStorage().requests[requestId];
    }

    function gasStation() external view returns (address) {
        return _getMainStorage().gasStation;
    }

    function maxFeePerGas() external view returns (uint256) {
        return _getMainStorage().maxFeePerGas;
    }
}

File 11 of 17 : IAnyrand.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8;

interface IAnyrand {
    /// @notice State of a request
    enum RequestState {
        /// @notice The request does not exist
        Nonexistent,
        /// @notice A request has been made, waiting for fulfilment
        Pending,
        /// @notice The request has been fulfilled successfully
        Fulfilled,
        /// @notice The request was fulfilled, but the callback failed
        Failed
    }

    event RandomnessRequested(
        uint256 indexed requestId,
        address indexed requester,
        bytes32 indexed pubKeyHash,
        uint256 round,
        uint256 callbackGasLimit,
        uint256 feePaid,
        uint256 effectiveFeePerGas
    );
    event RandomnessFulfilled(
        uint256 indexed requestId,
        uint256 randomness,
        bool callbackSuccess,
        uint256 actualGasUsed
    );
    event RandomnessCallbackFailed(
        uint256 indexed requestId,
        bytes32 retdata,
        uint256 gasLimit,
        uint256 actualGasUsed
    );
    event RequestPremiumMultiplierUpdated(uint256 newPrice);
    event ETHWithdrawn(uint256 amount);
    event BeaconUpdated(address indexed newBeacon);
    event MaxCallbackGasLimitUpdated(uint256 newMaxCallbackGasLimit);
    event MaxDeadlineDeltaUpdated(uint256 maxDeadlineDelta);
    event GasStationUpdated(address indexed newGasStation);
    event MaxFeePerGasUpdated(uint256 maxFeePerGas);

    error TransferFailed(address to, uint256 value);
    error IncorrectPayment(uint256 got, uint256 want);
    error OverGasLimit(uint256 callbackGasLimit);
    error InvalidRequestHash(bytes32 requestHash);
    error InvalidDeadline(uint256 deadline);
    error InsufficientGas();
    error InvalidBeacon(address beacon);
    error InvalidRequestState(RequestState state);

    /// @notice Compute the total request price
    /// @param callbackGasLimit The callback gas limit that will be used for
    ///     the randomness request
    function getRequestPrice(
        uint256 callbackGasLimit
    ) external view returns (uint256 totalPrice, uint256 effectiveFeePerGas);

    /// @notice Request randomness
    /// @param deadline Timestamp of when the randomness should be fulfilled. A
    ///     beacon round closest to this timestamp (rounding up to the nearest
    ///     future round) will be used as the round from which to derive
    ///     randomness.
    /// @param callbackGasLimit Gas limit for callback
    function requestRandomness(
        uint256 deadline,
        uint256 callbackGasLimit
    ) external payable returns (uint256);

    /// @notice Get the state of a request
    /// @param requestId The request identifier
    function getRequestState(
        uint256 requestId
    ) external view returns (RequestState);
}

File 12 of 17 : IDrandBeacon.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8;

/// @title IDrandBeacon
/// @author Kevin Charm ([email protected])
/// @notice Contract containing immutable information about a drand beacon.
interface IDrandBeacon {
    /// @notice Get the public key of the beacon
    function publicKey() external view returns (bytes memory);

    /// @notice Get the public key hash of the beacon
    function publicKeyHash() external view returns (bytes32);

    /// @notice Get the genesis timestamp of the beacon
    function genesisTimestamp() external view returns (uint256);

    /// @notice Get the period of the beacon
    function period() external view returns (uint256);

    /// @notice Verify the signature produced by a drand beacon round against
    ///     the known public key. Should revert if the signature is invalid.
    /// @param round The beacon round to verify
    /// @param signature The signature to verify
    function verifyBeaconRound(
        uint256 round,
        uint256[2] memory signature
    ) external;
}

File 13 of 17 : IGasStation.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.8;

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

interface IGasStation is ITypeAndVersion {
    /// @notice Compute the instantaneous cost of a transaction that consumes
    ///     `gasLimit` of gas
    /// @param gasLimit The gas limit that will be used to calculate the cost
    ///     of the transaction.
    /// @return totalCost The total transaction cost (in wei)
    /// @return effectiveFeePerGas The effective fee per gas, after accounting
    ///     for multidimensional pricing for L2s
    function getTxCost(
        uint256 gasLimit
    ) external view returns (uint256 totalCost, uint256 effectiveFeePerGas);
}

File 14 of 17 : IRandomiserCallbackV3.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8;

interface IRandomiserCallbackV3 {
    /// @notice Receive random words from a randomiser.
    /// @dev Ensure that proper access control is enforced on this function;
    ///     only the designated randomiser may call this function and the
    ///     requestId should be as expected from the randomness request.
    /// @param requestId The identifier for the original randomness request
    /// @param randomWord Uniform random number in the range [0, 2**256)
    function receiveRandomness(uint256 requestId, uint256 randomWord) external;
}

File 15 of 17 : ITypeAndVersion.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8;

/// @title ITypeAndVersion
interface ITypeAndVersion {
    /// @notice Identifier for contract type and version
    function typeAndVersion() external view returns (string memory);
}

File 16 of 17 : Gas.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8;

/// Code here was taken from the Chainlink repo at https://github.com/smartcontractkit/chainlink,
///
/// The MIT License (MIT)
///
/// Copyright (c) 2018 SmartContract ChainLink, Ltd.
///
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
///
/// The above copyright notice and this permission notice shall be included in
/// all copies or substantial portions of the Software.
///
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
/// THE SOFTWARE.

library Gas {
    // 5k is plenty for an EXTCODESIZE call (2600) + warm CALL (100)
    // and some arithmetic operations.
    uint256 internal constant GAS_FOR_CALL_EXACT_CHECK = 5_000;

    /// @dev calls target address with exactly gasAmount gas and data as calldata
    /// or reverts if at least gasAmount gas is not available.
    function callWithExactGas(
        uint256 gasAmount,
        address target,
        bytes memory data
    ) internal returns (bool success) {
        assembly {
            let g := gas()
            // Compute g -= GAS_FOR_CALL_EXACT_CHECK and check for underflow
            // The gas actually passed to the callee is min(gasAmount, 63//64*gas available).
            // We want to ensure that we revert if gasAmount >  63//64*gas available
            // as we do not want to provide them with less, however that check itself costs
            // gas.  GAS_FOR_CALL_EXACT_CHECK ensures we have at least enough gas to be able
            // to revert if gasAmount >  63//64*gas available.
            if lt(g, GAS_FOR_CALL_EXACT_CHECK) {
                revert(0, 0)
            }
            g := sub(g, GAS_FOR_CALL_EXACT_CHECK)
            // if g - g//64 <= gasAmount, revert
            // (we subtract g//64 because of EIP-150)
            if iszero(gt(sub(g, div(g, 64)), gasAmount)) {
                revert(0, 0)
            }
            // solidity calls check that a contract actually exists at the destination, so we do the same
            if iszero(extcodesize(target)) {
                revert(0, 0)
            }
            // call and return whether we succeeded. ignore return data
            // call(gas,addr,value,argsOffset,argsLength,retOffset,retLength)
            success := call(
                gasAmount,
                target,
                0,
                add(data, 0x20),
                mload(data),
                0,
                0
            )
        }
        return success;
    }
}

File 17 of 17 : Ownable.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

/// @notice Simple single owner authorization mixin.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/auth/Ownable.sol)
///
/// @dev Note:
/// This implementation does NOT auto-initialize the owner to `msg.sender`.
/// You MUST call the `_initializeOwner` in the constructor / initializer.
///
/// While the ownable portion follows
/// [EIP-173](https://eips.ethereum.org/EIPS/eip-173) for compatibility,
/// the nomenclature for the 2-step ownership handover may be unique to this codebase.
abstract contract Ownable {
    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                       CUSTOM ERRORS                        */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The caller is not authorized to call the function.
    error Unauthorized();

    /// @dev The `newOwner` cannot be the zero address.
    error NewOwnerIsZeroAddress();

    /// @dev The `pendingOwner` does not have a valid handover request.
    error NoHandoverRequest();

    /// @dev Cannot double-initialize.
    error AlreadyInitialized();

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                           EVENTS                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The ownership is transferred from `oldOwner` to `newOwner`.
    /// This event is intentionally kept the same as OpenZeppelin's Ownable to be
    /// compatible with indexers and [EIP-173](https://eips.ethereum.org/EIPS/eip-173),
    /// despite it not being as lightweight as a single argument event.
    event OwnershipTransferred(address indexed oldOwner, address indexed newOwner);

    /// @dev An ownership handover to `pendingOwner` has been requested.
    event OwnershipHandoverRequested(address indexed pendingOwner);

    /// @dev The ownership handover to `pendingOwner` has been canceled.
    event OwnershipHandoverCanceled(address indexed pendingOwner);

    /// @dev `keccak256(bytes("OwnershipTransferred(address,address)"))`.
    uint256 private constant _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE =
        0x8be0079c531659141344cd1fd0a4f28419497f9722a3daafe3b4186f6b6457e0;

    /// @dev `keccak256(bytes("OwnershipHandoverRequested(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE =
        0xdbf36a107da19e49527a7176a1babf963b4b0ff8cde35ee35d6cd8f1f9ac7e1d;

    /// @dev `keccak256(bytes("OwnershipHandoverCanceled(address)"))`.
    uint256 private constant _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE =
        0xfa7b8eab7da67f412cc9575ed43464468f9bfbae89d1675917346ca6d8fe3c92;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                          STORAGE                           */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev The owner slot is given by:
    /// `bytes32(~uint256(uint32(bytes4(keccak256("_OWNER_SLOT_NOT")))))`.
    /// It is intentionally chosen to be a high value
    /// to avoid collision with lower slots.
    /// The choice of manual storage layout is to enable compatibility
    /// with both regular and upgradeable contracts.
    bytes32 internal constant _OWNER_SLOT =
        0xffffffffffffffffffffffffffffffffffffffffffffffffffffffff74873927;

    /// The ownership handover slot of `newOwner` is given by:
    /// ```
    ///     mstore(0x00, or(shl(96, user), _HANDOVER_SLOT_SEED))
    ///     let handoverSlot := keccak256(0x00, 0x20)
    /// ```
    /// It stores the expiry timestamp of the two-step ownership handover.
    uint256 private constant _HANDOVER_SLOT_SEED = 0x389a75e1;

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                     INTERNAL FUNCTIONS                     */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Override to return true to make `_initializeOwner` prevent double-initialization.
    function _guardInitializeOwner() internal pure virtual returns (bool guard) {}

    /// @dev Initializes the owner directly without authorization guard.
    /// This function must be called upon initialization,
    /// regardless of whether the contract is upgradeable or not.
    /// This is to enable generalization to both regular and upgradeable contracts,
    /// and to save gas in case the initial owner is not the caller.
    /// For performance reasons, this function will not check if there
    /// is an existing owner.
    function _initializeOwner(address newOwner) internal virtual {
        if (_guardInitializeOwner()) {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                if sload(ownerSlot) {
                    mstore(0x00, 0x0dc149f0) // `AlreadyInitialized()`.
                    revert(0x1c, 0x04)
                }
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Store the new value.
                sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
            }
        } else {
            /// @solidity memory-safe-assembly
            assembly {
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Store the new value.
                sstore(_OWNER_SLOT, newOwner)
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, 0, newOwner)
            }
        }
    }

    /// @dev Sets the owner directly without authorization guard.
    function _setOwner(address newOwner) internal virtual {
        if (_guardInitializeOwner()) {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
                // Store the new value.
                sstore(ownerSlot, or(newOwner, shl(255, iszero(newOwner))))
            }
        } else {
            /// @solidity memory-safe-assembly
            assembly {
                let ownerSlot := _OWNER_SLOT
                // Clean the upper 96 bits.
                newOwner := shr(96, shl(96, newOwner))
                // Emit the {OwnershipTransferred} event.
                log3(0, 0, _OWNERSHIP_TRANSFERRED_EVENT_SIGNATURE, sload(ownerSlot), newOwner)
                // Store the new value.
                sstore(ownerSlot, newOwner)
            }
        }
    }

    /// @dev Throws if the sender is not the owner.
    function _checkOwner() internal view virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // If the caller is not the stored owner, revert.
            if iszero(eq(caller(), sload(_OWNER_SLOT))) {
                mstore(0x00, 0x82b42900) // `Unauthorized()`.
                revert(0x1c, 0x04)
            }
        }
    }

    /// @dev Returns how long a two-step ownership handover is valid for in seconds.
    /// Override to return a different value if needed.
    /// Made internal to conserve bytecode. Wrap it in a public function if needed.
    function _ownershipHandoverValidFor() internal view virtual returns (uint64) {
        return 48 * 3600;
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                  PUBLIC UPDATE FUNCTIONS                   */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Allows the owner to transfer the ownership to `newOwner`.
    function transferOwnership(address newOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            if iszero(shl(96, newOwner)) {
                mstore(0x00, 0x7448fbae) // `NewOwnerIsZeroAddress()`.
                revert(0x1c, 0x04)
            }
        }
        _setOwner(newOwner);
    }

    /// @dev Allows the owner to renounce their ownership.
    function renounceOwnership() public payable virtual onlyOwner {
        _setOwner(address(0));
    }

    /// @dev Request a two-step ownership handover to the caller.
    /// The request will automatically expire in 48 hours (172800 seconds) by default.
    function requestOwnershipHandover() public payable virtual {
        unchecked {
            uint256 expires = block.timestamp + _ownershipHandoverValidFor();
            /// @solidity memory-safe-assembly
            assembly {
                // Compute and set the handover slot to `expires`.
                mstore(0x0c, _HANDOVER_SLOT_SEED)
                mstore(0x00, caller())
                sstore(keccak256(0x0c, 0x20), expires)
                // Emit the {OwnershipHandoverRequested} event.
                log2(0, 0, _OWNERSHIP_HANDOVER_REQUESTED_EVENT_SIGNATURE, caller())
            }
        }
    }

    /// @dev Cancels the two-step ownership handover to the caller, if any.
    function cancelOwnershipHandover() public payable virtual {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, caller())
            sstore(keccak256(0x0c, 0x20), 0)
            // Emit the {OwnershipHandoverCanceled} event.
            log2(0, 0, _OWNERSHIP_HANDOVER_CANCELED_EVENT_SIGNATURE, caller())
        }
    }

    /// @dev Allows the owner to complete the two-step ownership handover to `pendingOwner`.
    /// Reverts if there is no existing ownership handover requested by `pendingOwner`.
    function completeOwnershipHandover(address pendingOwner) public payable virtual onlyOwner {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute and set the handover slot to 0.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            let handoverSlot := keccak256(0x0c, 0x20)
            // If the handover does not exist, or has expired.
            if gt(timestamp(), sload(handoverSlot)) {
                mstore(0x00, 0x6f5e8818) // `NoHandoverRequest()`.
                revert(0x1c, 0x04)
            }
            // Set the handover slot to 0.
            sstore(handoverSlot, 0)
        }
        _setOwner(pendingOwner);
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                   PUBLIC READ FUNCTIONS                    */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Returns the owner of the contract.
    function owner() public view virtual returns (address result) {
        /// @solidity memory-safe-assembly
        assembly {
            result := sload(_OWNER_SLOT)
        }
    }

    /// @dev Returns the expiry timestamp for the two-step ownership handover to `pendingOwner`.
    function ownershipHandoverExpiresAt(address pendingOwner)
        public
        view
        virtual
        returns (uint256 result)
    {
        /// @solidity memory-safe-assembly
        assembly {
            // Compute the handover slot.
            mstore(0x0c, _HANDOVER_SLOT_SEED)
            mstore(0x00, pendingOwner)
            // Load the handover slot.
            result := sload(keccak256(0x0c, 0x20))
        }
    }

    /*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
    /*                         MODIFIERS                          */
    /*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/

    /// @dev Marks a function as only callable by the owner.
    modifier onlyOwner() virtual {
        _checkOwner();
        _;
    }
}

Settings
{
  "viaIR": false,
  "optimizer": {
    "enabled": true,
    "runs": 1000
  },
  "evmVersion": "paris",
  "outputSelection": {
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        "userdoc",
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        "abi"
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  }
}

Contract ABI

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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.