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// SPDX-License-Identifier: GPL-3.0

// LICENSE
// VMAAuction.sol is a modified version of Nouns' NounsAuctionHouse.sol:
// https://github.com/nounsDAO/nouns-monorepo/blob/master/packages/nouns-contracts/contracts/NounsAuctionHouse.sol
//
// VMAAuction.sol source code Copyright LOVO licensed under the GPL-3.0 license.
// With modifications by Nounders DAO.

pragma solidity ^0.8.16;

import {ReentrancyGuard} from "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import {Pausable} from "@openzeppelin/contracts/security/Pausable.sol";
import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {IVMAAuction} from "./interfaces/IVMAAuction.sol";
import {IVoiceMaskAlpha} from "./interfaces/IVoiceMaskAlpha.sol";

contract VMAAuction is IVMAAuction, Pausable, ReentrancyGuard, Ownable {
    IVoiceMaskAlpha public voiceMaskAlpha;

    uint256 public timeBuffer;

    uint256 public reservePrice;

    uint256 public durationTime;

    uint256 public gas;

    uint8 public minBidIncrementPercentage;

    IVMAAuction.Auction public auction;

    constructor(
        IVoiceMaskAlpha _alpha, //alpha nft
        uint256 _timeBuffer, // padding time. 300 = 5min
        uint256 _reservePrice, // at least 0
        uint256 _durationTime, // 43200 = 12hrs
        uint8 _minBidIncrementPercentage // 2%
    ) {
        _pause();

        voiceMaskAlpha = _alpha;
        timeBuffer = _timeBuffer;
        reservePrice = _reservePrice;
        durationTime = _durationTime;
        minBidIncrementPercentage = _minBidIncrementPercentage;
        gas = 30000;
    }

    function settleCurrentAndCreateNewAuction()
        external
        override
        nonReentrant
        whenNotPaused
    {
        _settleAuction();
        _createAuction();
    }

    /**
     * Settle the current auction.
     * This function can be called when the contract is paused.
     */
    function settleAuction() external override whenPaused nonReentrant {
        _settleAuction();
    }

    /**
     * Create a bid for an Alpha, with a given value.
     */
    function createBid(uint256 alphaId)
        external
        payable
        override
        whenNotPaused
        nonReentrant
    {
        IVMAAuction.Auction memory _auction = auction;

        require(block.timestamp < _auction.endTime, "Auction is expired");
        require(_auction.alphaId == alphaId, "Not for this auction");
        require(msg.value >= reservePrice, "Send at least reservePrice");
        require(
            msg.value >=
                _auction.price +
                    ((_auction.price * minBidIncrementPercentage) / 100),
            "Increase the bid by minBidIncrementPercentage"
        );

        address payable lastBidder = _auction.bidder;
        require(msg.sender != lastBidder, "Wait for next turn");

        // Refund the last bidder
        if (lastBidder != address(0)) {
            _transferETH(lastBidder, _auction.price);
        }

        auction.price = msg.value;
        auction.bidder = payable(msg.sender);

        // Extend the auction if bidded within timeBuffer time before the auction ends.
        bool extended = _auction.endTime - block.timestamp < timeBuffer;
        if (extended) {
            auction.endTime = _auction.endTime = block.timestamp + timeBuffer;
        }

        emit AuctionBid(_auction.alphaId, msg.sender, msg.value, extended);

        if (extended) {
            emit AuctionExtended(_auction.alphaId, _auction.endTime);
        }
    }

    /**
     * Pause the auction.
     * CreateBid is unactivated by this function.
     * The auction can be settled by anyone after the endtime has passed.
     */
    function pause() external override onlyOwner {
        _pause();
    }

    /**
     * Unpause the auction.
     * If there is no active auction, this function will start a new auction.
     */
    function unpause() external override onlyOwner {
        _unpause();

        if (auction.startTime == 0 || auction.settled) {
            _createAuction();
        }
    }

    function setTimeBuffer(uint256 _timeBuffer) external override onlyOwner {
        timeBuffer = _timeBuffer;

        emit AuctionTimeBufferUpdated(_timeBuffer);
    }

    function setReservePrice(uint256 _reservePrice)
        external
        override
        onlyOwner
    {
        reservePrice = _reservePrice;

        emit AuctionReservePriceUpdated(_reservePrice);
    }

    function setMinBidIncrementPercentage(uint8 _minBidIncrementPercentage)
        external
        override
        onlyOwner
    {
        minBidIncrementPercentage = _minBidIncrementPercentage;

        emit AuctionMinBidIncrementPercentageUpdated(
            _minBidIncrementPercentage
        );
    }

    function setGas(uint256 _gas) external onlyOwner {
        require(_gas >= 21000, "Gas is not enough for transaction");
        gas = _gas;

        emit AuctionGasUpdated(gas);
    }

    function setDuration(uint256 _durationTime) external onlyOwner {
        durationTime = _durationTime;
    }

    /**
     * Create an auction.
     * Store the auction details in the auction state variable.
     * If the mint reverts, the contract will be paused.
     */
    function _createAuction() internal {
        try voiceMaskAlpha.mintAuction() returns (uint256 alphaId) {
            uint256 startTime = block.timestamp;
            uint256 endTime = startTime + durationTime;

            auction = Auction({
                alphaId: alphaId,
                price: 0, //입찰가
                startTime: startTime,
                endTime: endTime,
                bidder: payable(0),
                settled: false
            });

            emit AuctionCreated(alphaId, startTime, endTime);
        } catch Error(string memory error) {
            _pause();
            emit AuctionCreateFailed(error);
        }
    }

    /**
     *  Settle an auction. Finish the bid and payment.
     *  If there is no bid the Alpha NFT will be send to the owner's EOA.
     */
    function _settleAuction() internal {
        IVMAAuction.Auction memory _auction = auction;

        require(block.timestamp >= _auction.endTime, "Auction is active");
        require(!_auction.settled, "Auction is settled already");
        require(_auction.startTime != 0, "Auction didn't start yet");

        auction.settled = true;

        if (_auction.bidder == address(0)) {
            // No one made a bid
            voiceMaskAlpha.transferFrom(
                address(this),
                owner(),
                _auction.alphaId
            );
        } else {
            voiceMaskAlpha.transferFrom(
                address(this),
                _auction.bidder,
                _auction.alphaId
            );
        }

        if (_auction.price > 0) {
            //send money to the owner EOA
            _transferETH(owner(), _auction.price);
        }

        emit AuctionSettled(_auction.alphaId, _auction.bidder, _auction.price);
    }

    /**
     * Transfer ETH.
     */
    function _transferETH(address to, uint256 amount) internal {
        if (!_safeTransferETH(to, amount)) {
            emit AuctionRefundFailed(to, amount);
        }
    }

    /**
     * Transfer ETH and return the success status.
     */
    function _safeTransferETH(address to, uint256 value)
        internal
        returns (bool)
    {
        (bool success, ) = to.call{value: value, gas: gas}(new bytes(0));
        return success;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @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 ReentrancyGuard {
    // 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;

    uint256 private _status;

    constructor() {
        _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() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/Pausable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!paused(), "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(paused(), "Pausable: not paused");
        _;
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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 {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.16;


interface IVMAAuction {
    struct Auction {
        uint256 alphaId;
        uint256 price;// currently the highest bid price
        uint256 startTime;
        uint256 endTime;
        address payable bidder;
        bool settled;
    }

    event AuctionCreated(uint256 indexed alphaId, uint256 startTime, uint256 endTime);

    event AuctionBid(uint256 indexed alphaId, address sender, uint256 value, bool extended);

    event AuctionExtended(uint256 indexed alphaId, uint256 endTime);

    event AuctionCreateFailed(string error);

    event AuctionRefundFailed(address indexed winner, uint256 amount);

    event AuctionSettled(uint256 indexed alphaId, address winner, uint256 amount);

    event AuctionTimeBufferUpdated(uint256 timeBuffer);

    event AuctionReservePriceUpdated(uint256 reservePrice);

    event AuctionMinBidIncrementPercentageUpdated(uint256 minBidIncrementPercentage);

    event AuctionGasUpdated(uint256 gas);


    function settleAuction() external;

    function settleCurrentAndCreateNewAuction() external;

    function createBid(uint256 alphaId) external payable;

    function pause() external;

    function unpause() external;

    function setTimeBuffer(uint256 timeBuffer) external;

    function setReservePrice(uint256 reservePrice) external;

    function setMinBidIncrementPercentage(uint8 minBidIncrementPercentage) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.16;

// import { IERC721 } from '@openzeppelin/contracts/token/ERC721/IERC721.sol';
import {IERC721AQueryable} from "erc721a/contracts/extensions/IERC721AQueryable.sol";
import {IERC721ABurnable} from "erc721a/contracts/extensions/IERC721ABurnable.sol";

interface IVoiceMaskAlpha is IERC721ABurnable{
    event AlphaCreated(uint256 indexed tokenId, address to);

    event AlphaBurned(uint256 indexed tokenId);

    event MinterUpdated(address minter);

    function mintAuction() external returns (uint256);

    function mintTeam(address to, uint256 quantity) external returns (uint256);

    function burn(uint256 alphaId) external;

    function setMinter(address _minter) external;

    function setAuctionSupply(uint256 _maxMint) external;

    function setTeamSupply(uint256 _maxMint) external;

    function setBaseURI(string memory uri) external;

}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.3
// Creator: Chiru Labs

pragma solidity ^0.8.4;

import '../IERC721A.sol';

/**
 * @dev Interface of ERC721AQueryable.
 */
interface IERC721AQueryable is IERC721A {
    /**
     * Invalid query range (`start` >= `stop`).
     */
    error InvalidQueryRange();

    /**
     * @dev Returns the `TokenOwnership` struct at `tokenId` without reverting.
     *
     * If the `tokenId` is out of bounds:
     *
     * - `addr = address(0)`
     * - `startTimestamp = 0`
     * - `burned = false`
     * - `extraData = 0`
     *
     * If the `tokenId` is burned:
     *
     * - `addr = <Address of owner before token was burned>`
     * - `startTimestamp = <Timestamp when token was burned>`
     * - `burned = true`
     * - `extraData = <Extra data when token was burned>`
     *
     * Otherwise:
     *
     * - `addr = <Address of owner>`
     * - `startTimestamp = <Timestamp of start of ownership>`
     * - `burned = false`
     * - `extraData = <Extra data at start of ownership>`
     */
    function explicitOwnershipOf(uint256 tokenId) external view returns (TokenOwnership memory);

    /**
     * @dev Returns an array of `TokenOwnership` structs at `tokenIds` in order.
     * See {ERC721AQueryable-explicitOwnershipOf}
     */
    function explicitOwnershipsOf(uint256[] memory tokenIds) external view returns (TokenOwnership[] memory);

    /**
     * @dev Returns an array of token IDs owned by `owner`,
     * in the range [`start`, `stop`)
     * (i.e. `start <= tokenId < stop`).
     *
     * This function allows for tokens to be queried if the collection
     * grows too big for a single call of {ERC721AQueryable-tokensOfOwner}.
     *
     * Requirements:
     *
     * - `start < stop`
     */
    function tokensOfOwnerIn(
        address owner,
        uint256 start,
        uint256 stop
    ) external view returns (uint256[] memory);

    /**
     * @dev Returns an array of token IDs owned by `owner`.
     *
     * This function scans the ownership mapping and is O(`totalSupply`) in complexity.
     * It is meant to be called off-chain.
     *
     * See {ERC721AQueryable-tokensOfOwnerIn} for splitting the scan into
     * multiple smaller scans if the collection is large enough to cause
     * an out-of-gas error (10K collections should be fine).
     */
    function tokensOfOwner(address owner) external view returns (uint256[] memory);
}

// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.3
// Creator: Chiru Labs

pragma solidity ^0.8.4;

import '../IERC721A.sol';

/**
 * @dev Interface of ERC721ABurnable.
 */
interface IERC721ABurnable is IERC721A {
    /**
     * @dev Burns `tokenId`. See {ERC721A-_burn}.
     *
     * Requirements:
     *
     * - The caller must own `tokenId` or be an approved operator.
     */
    function burn(uint256 tokenId) external;
}

// SPDX-License-Identifier: MIT
// ERC721A Contracts v4.2.3
// Creator: Chiru Labs

pragma solidity ^0.8.4;

/**
 * @dev Interface of ERC721A.
 */
interface IERC721A {
    /**
     * The caller must own the token or be an approved operator.
     */
    error ApprovalCallerNotOwnerNorApproved();

    /**
     * The token does not exist.
     */
    error ApprovalQueryForNonexistentToken();

    /**
     * Cannot query the balance for the zero address.
     */
    error BalanceQueryForZeroAddress();

    /**
     * Cannot mint to the zero address.
     */
    error MintToZeroAddress();

    /**
     * The quantity of tokens minted must be more than zero.
     */
    error MintZeroQuantity();

    /**
     * The token does not exist.
     */
    error OwnerQueryForNonexistentToken();

    /**
     * The caller must own the token or be an approved operator.
     */
    error TransferCallerNotOwnerNorApproved();

    /**
     * The token must be owned by `from`.
     */
    error TransferFromIncorrectOwner();

    /**
     * Cannot safely transfer to a contract that does not implement the
     * ERC721Receiver interface.
     */
    error TransferToNonERC721ReceiverImplementer();

    /**
     * Cannot transfer to the zero address.
     */
    error TransferToZeroAddress();

    /**
     * The token does not exist.
     */
    error URIQueryForNonexistentToken();

    /**
     * The `quantity` minted with ERC2309 exceeds the safety limit.
     */
    error MintERC2309QuantityExceedsLimit();

    /**
     * The `extraData` cannot be set on an unintialized ownership slot.
     */
    error OwnershipNotInitializedForExtraData();

    // =============================================================
    //                            STRUCTS
    // =============================================================

    struct TokenOwnership {
        // The address of the owner.
        address addr;
        // Stores the start time of ownership with minimal overhead for tokenomics.
        uint64 startTimestamp;
        // Whether the token has been burned.
        bool burned;
        // Arbitrary data similar to `startTimestamp` that can be set via {_extraData}.
        uint24 extraData;
    }

    // =============================================================
    //                         TOKEN COUNTERS
    // =============================================================

    /**
     * @dev Returns the total number of tokens in existence.
     * Burned tokens will reduce the count.
     * To get the total number of tokens minted, please see {_totalMinted}.
     */
    function totalSupply() external view returns (uint256);

    // =============================================================
    //                            IERC165
    // =============================================================

    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);

    // =============================================================
    //                            IERC721
    // =============================================================

    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables
     * (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in `owner`'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`,
     * checking first that contract recipients are aware of the ERC721 protocol
     * to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move
     * this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement
     * {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external payable;

    /**
     * @dev Equivalent to `safeTransferFrom(from, to, tokenId, '')`.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external payable;

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom}
     * whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token
     * by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external payable;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the
     * zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external payable;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom}
     * for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    // =============================================================
    //                        IERC721Metadata
    // =============================================================

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

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);

    // =============================================================
    //                           IERC2309
    // =============================================================

    /**
     * @dev Emitted when tokens in `fromTokenId` to `toTokenId`
     * (inclusive) is transferred from `from` to `to`, as defined in the
     * [ERC2309](https://eips.ethereum.org/EIPS/eip-2309) standard.
     *
     * See {_mintERC2309} for more details.
     */
    event ConsecutiveTransfer(uint256 indexed fromTokenId, uint256 toTokenId, address indexed from, address indexed to);
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract IVoiceMaskAlpha","name":"_alpha","type":"address"},{"internalType":"uint256","name":"_timeBuffer","type":"uint256"},{"internalType":"uint256","name":"_reservePrice","type":"uint256"},{"internalType":"uint256","name":"_durationTime","type":"uint256"},{"internalType":"uint8","name":"_minBidIncrementPercentage","type":"uint8"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"alphaId","type":"uint256"},{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"},{"indexed":false,"internalType":"bool","name":"extended","type":"bool"}],"name":"AuctionBid","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"string","name":"error","type":"string"}],"name":"AuctionCreateFailed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"alphaId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"startTime","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"endTime","type":"uint256"}],"name":"AuctionCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"alphaId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"endTime","type":"uint256"}],"name":"AuctionExtended","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"gas","type":"uint256"}],"name":"AuctionGasUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"minBidIncrementPercentage","type":"uint256"}],"name":"AuctionMinBidIncrementPercentageUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"winner","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"AuctionRefundFailed","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"reservePrice","type":"uint256"}],"name":"AuctionReservePriceUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"alphaId","type":"uint256"},{"indexed":false,"internalType":"address","name":"winner","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"AuctionSettled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"timeBuffer","type":"uint256"}],"name":"AuctionTimeBufferUpdated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Paused","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"account","type":"address"}],"name":"Unpaused","type":"event"},{"inputs":[],"name":"auction","outputs":[{"internalType":"uint256","name":"alphaId","type":"uint256"},{"internalType":"uint256","name":"price","type":"uint256"},{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"},{"internalType":"address payable","name":"bidder","type":"address"},{"internalType":"bool","name":"settled","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"alphaId","type":"uint256"}],"name":"createBid","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"durationTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"gas","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minBidIncrementPercentage","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"pause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"reservePrice","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_durationTime","type":"uint256"}],"name":"setDuration","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_gas","type":"uint256"}],"name":"setGas","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint8","name":"_minBidIncrementPercentage","type":"uint8"}],"name":"setMinBidIncrementPercentage","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_reservePrice","type":"uint256"}],"name":"setReservePrice","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_timeBuffer","type":"uint256"}],"name":"setTimeBuffer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"settleAuction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"settleCurrentAndCreateNewAuction","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"timeBuffer","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"voiceMaskAlpha","outputs":[{"internalType":"contract IVoiceMaskAlpha","name":"","type":"address"}],"stateMutability":"view","type":"function"}]

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0000000000000000000000006a882514a509271bf8a5e3f16268c3a363dc93a9000000000000000000000000000000000000000000000000000000000000012c0000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000000000000000a8c00000000000000000000000000000000000000000000000000000000000000002

-----Decoded View---------------
Arg [0] : _alpha (address): 0x6a882514a509271Bf8A5e3F16268C3a363Dc93A9
Arg [1] : _timeBuffer (uint256): 300
Arg [2] : _reservePrice (uint256): 1
Arg [3] : _durationTime (uint256): 43200
Arg [4] : _minBidIncrementPercentage (uint8): 2

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000006a882514a509271bf8a5e3f16268c3a363dc93a9
Arg [1] : 000000000000000000000000000000000000000000000000000000000000012c
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000001
Arg [3] : 000000000000000000000000000000000000000000000000000000000000a8c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000002