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// SPDX-License-Identifier: MIT
//
//
//  ________  ________  ________  ________  ________  _________
// |\   __  \|\   __  \|\   __  \|\   __  \|\   ____\|\___   ___\
// \ \  \|\ /\ \  \|\  \ \  \|\  \ \  \|\  \ \  \___|\|___ \  \_|
//  \ \   __  \ \  \\\  \ \  \\\  \ \  \\\  \ \_____  \   \ \  \
//   \ \  \|\  \ \  \\\  \ \  \\\  \ \  \\\  \|____|\  \   \ \  \
//    \ \_______\ \_______\ \_______\ \_______\____\_\  \   \ \__\
//     \|_______|\|_______|\|_______|\|_______|\_________\   \|__|
//                                            \|_________|
//
//
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";

interface ITZRKT {
	function mint(address to, uint256 amount) external;

	function totalSupply() external view returns (uint256);
}

contract MintTZRKT is Ownable {
	using ECDSA for bytes32;

	// TZRKT Contract address
	address private _tzrktContract;

	// users mint count
	mapping(address => uint256) private _userMintCount;

	/**
	 * whitelist check signer address
	 */
	address private _ogBillySignerAddress;
	address private _billyPlusSignerAddress;
	address private _billySignerAddress;

	/**
	 * mint start/end time
	 */
	uint256 private _ogBillyMintStartTime;
	uint256 private _ogBillyMintEndTime;
	uint256 private _billyPlusMintStartTime;
	uint256 private _billyPlusMintEndTime;
	uint256 private _billyMintStartTime;
	uint256 private _billyMintEndTime;

	// events
	event TZRKTContractChanged(address indexed previousContract, address indexed newContract);

	constructor() {
		// Minting Time
		_ogBillyMintStartTime = 1688014800; // 2023-06-29 05:00:00 UTC
		_ogBillyMintEndTime = 1688057999; // 2023-06-29 16:59:59 UTC
		_billyPlusMintStartTime = 1688058000; // 2023-06-29 17:00:00 UTC
		_billyPlusMintEndTime = 1688101199; // 2023-06-30 04:59:59 UTC
		_billyMintStartTime = 1688101200; // 2023-06-30 05:00:00 UTC
		_billyMintEndTime = 1688144400; // 2023-06-30 17:20:00 UTC
	}

	/**
	 * @notice set address of the TZRKT NFT contract.
	 * can only be called by the owner
	 * @param newTzrktContract TZRKT NFT contract address
	 */
	function setTZRKTContract(address newTzrktContract) public onlyOwner {
		require(newTzrktContract != address(0), "setTZRKTContract: contract address is the zero address");
		address oldTzrktContract = _tzrktContract;
		_tzrktContract = newTzrktContract;
		emit TZRKTContractChanged(oldTzrktContract, newTzrktContract);
	}

	/**
	 * @notice set address of the OG Billy Signer
	 * can only be called by the owner
	 * @param newSigner address of digital signature signer
	 */
	function setOgBillySignerAddress(address newSigner) public onlyOwner {
		require(newSigner != address(0), "setOgBillySignerAddress: signer address is the zero address");
		_ogBillySignerAddress = newSigner;
	}

	/**
	 * @notice set address of the Billy Plus Signer
	 * can only be called by the owner
	 * @param newSigner address of digital signature signer
	 */
	function setBillyPlusSignerAddress(address newSigner) public onlyOwner {
		require(newSigner != address(0), "setBillyPlusSignerAddress: signer address is the zero address");
		_billyPlusSignerAddress = newSigner;
	}

	/**
	 * @notice set address of the Billy Signer
	 * can only be called by the owner
	 * @param newSigner address of digital signature signer
	 */
	function setBillySignerAddress(address newSigner) public onlyOwner {
		require(newSigner != address(0), "setBillySignerAddress: signer address is the zero address");
		_billySignerAddress = newSigner;
	}

	/**
	 * @notice set OG Billy Mint Time
	 * can only be called by the owner
	 * @param startTime mint start epoch time
	 * @param endTime mint end epoch time
	 */
	function setOgBillyMintTime(uint256 startTime, uint256 endTime) public onlyOwner {
		require(startTime < endTime, "setOgBillyMintTime: startTime is greater than endTime");
		_ogBillyMintStartTime = startTime;
		_ogBillyMintEndTime = endTime;
	}

	/**
	 * @notice set Billy Plus Mint Time
	 * can only be called by the owner
	 * @param startTime mint start epoch time
	 * @param endTime mint end epoch time
	 */
	function setBillyPlusMintTime(uint256 startTime, uint256 endTime) public onlyOwner {
		require(startTime < endTime, "setBillyPlusMintTime: startTime is greater than endTime");
		_billyPlusMintStartTime = startTime;
		_billyPlusMintEndTime = endTime;
	}

	/**
	 * @notice set Billy Mint Time
	 * can only be called by the owner
	 * @param startTime mint start epoch time
	 * @param endTime mint end epoch time
	 */
	function setBillyMintTime(uint256 startTime, uint256 endTime) public onlyOwner {
		require(startTime < endTime, "setBillyMintTime: startTime is greater than endTime");
		_billyMintStartTime = startTime;
		_billyMintEndTime = endTime;
	}

	/**
	 * @notice mint for og billy
	 * @param amount amount of mint TZRKT
	 * @param ogBillySignature digital signature of og billy
	 * @param billyPlusSignature digital signature of billy plus
	 * @param billySignature digital signature of billy
	 */
	function mintOgBilly(
		uint256 amount,
		bytes memory ogBillySignature,
		bytes memory billyPlusSignature,
		bytes memory billySignature
	) public {
		require(_tzrktContract != address(0), "mintOgBilly: _tzrktContract is the zero address.");
		require(checkOgBillyMintTime(), "mintOgBilly: not minting time");

		// signature validate
		// need og billy signature
		bool ogBillyVerified = !_isEmptyStringBytes(ogBillySignature) &&
			_verifyAddressSigner(_msgSender(), _ogBillySignerAddress, ogBillySignature);
		require(ogBillyVerified, "mintOgBilly: signature invalid");

		uint256 mintAvailableCount = getMintAvailableCount(
			_msgSender(),
			ogBillySignature,
			billyPlusSignature,
			billySignature
		);
		require(amount <= mintAvailableCount, "mintOgBilly: exceeded mint supply.");

		ITZRKT(_tzrktContract).mint(_msgSender(), amount);

		_userMintCount[_msgSender()] += amount;
	}

	/**
	 * @notice mint for billy plus
	 * @param amount amount of mint TZRKT
	 * @param ogBillySignature digital signature of og billy
	 * @param billyPlusSignature digital signature of billy plus
	 * @param billySignature digital signature of billy
	 */
	function mintBillyPlus(
		uint256 amount,
		bytes memory ogBillySignature,
		bytes memory billyPlusSignature,
		bytes memory billySignature
	) public {
		require(_tzrktContract != address(0), "mintBillyPlus: _tzrktContract is the zero address.");
		require(checkBillyPlusMintTime(), "mintBillyPlus: not minting time");

		// signature validate
		// need og billy or billy plus
		bool ogBillyVerified = !_isEmptyStringBytes(ogBillySignature) &&
			_verifyAddressSigner(_msgSender(), _ogBillySignerAddress, ogBillySignature);
		bool billyPlusVerified = !_isEmptyStringBytes(billyPlusSignature) &&
			_verifyAddressSigner(_msgSender(), _billyPlusSignerAddress, billyPlusSignature);
		require(ogBillyVerified || billyPlusVerified, "mintBillyPlus: signature invalid");

		uint256 mintAvailableCount = getMintAvailableCount(
			_msgSender(),
			ogBillySignature,
			billyPlusSignature,
			billySignature
		);
		require(amount <= mintAvailableCount, "mintBillyPlus: exceeded mint supply.");

		ITZRKT(_tzrktContract).mint(_msgSender(), amount);

		_userMintCount[_msgSender()] += amount;
	}

	/**
	 * @notice mint for billy
	 * @param amount amount of mint TZRKT
	 * @param ogBillySignature digital signature of og billy
	 * @param billyPlusSignature digital signature of billy plus
	 * @param billySignature digital signature of billy
	 */
	function mintBilly(
		uint256 amount,
		bytes memory ogBillySignature,
		bytes memory billyPlusSignature,
		bytes memory billySignature
	) public {
		require(_tzrktContract != address(0), "mintBilly: _tzrktContract is the zero address.");
		require(checkBillyMintTime(), "mintBilly: not minting time");

		// signature validate
		// need og billy or billy plus or billy
		bool ogBillyVerified = !_isEmptyStringBytes(ogBillySignature) &&
			_verifyAddressSigner(_msgSender(), _ogBillySignerAddress, ogBillySignature);
		bool billyPlusVerified = !_isEmptyStringBytes(billyPlusSignature) &&
			_verifyAddressSigner(_msgSender(), _billyPlusSignerAddress, billyPlusSignature);
		bool billyVerified = !_isEmptyStringBytes(billySignature) &&
			_verifyAddressSigner(_msgSender(), _billySignerAddress, billySignature);
		require(ogBillyVerified || billyPlusVerified || billyVerified, "mintBilly: signature invalid");

		uint256 mintAvailableCount = getMintAvailableCount(
			_msgSender(),
			ogBillySignature,
			billyPlusSignature,
			billySignature
		);
		require(amount <= mintAvailableCount, "mintBilly: exceeded mint supply.");

		ITZRKT(_tzrktContract).mint(_msgSender(), amount);

		_userMintCount[_msgSender()] += amount;
	}

	/**
	 * @notice get current block timestamp
	 */
	function getCurrentBlockTime() public view returns (uint) {
		return block.timestamp;
	}

	/**
	 * @notice check start time of OG Billy
	 */
	function checkOgBillyMintTime() public view returns (bool) {
		return _ogBillyMintStartTime <= block.timestamp && _ogBillyMintEndTime >= block.timestamp;
	}

	/**
	 * @notice check start time of Billy Plus
	 */
	function checkBillyPlusMintTime() public view returns (bool) {
		return _billyPlusMintStartTime <= block.timestamp && _billyPlusMintEndTime >= block.timestamp;
	}

	/**
	 * @notice check start time of Billy
	 */
	function checkBillyMintTime() public view returns (bool) {
		return _billyMintStartTime <= block.timestamp && _billyMintEndTime >= block.timestamp;
	}

	/**
	 * @notice get users mint available count by role
	 * @param sender address of wallet
	 * @param ogBillySignature digital signature of og billy
	 * @param billyPlusSignature digital signature of billy plus
	 * @param billySignature digital signature of billy
	 */
	function getMintAvailableCount(
		address sender,
		bytes memory ogBillySignature,
		bytes memory billyPlusSignature,
		bytes memory billySignature
	) public view returns (uint256) {
		require(sender != address(0), "getMintAvailableCount: sender address is the zero address");

		uint256 totalMintAvailableCount = _getTotalMintAvailableCount(
			sender,
			ogBillySignature,
			billyPlusSignature,
			billySignature
		);
		return totalMintAvailableCount - _userMintCount[sender];
	}

	/**
	 * @notice verify signer
	 * @param sender address of wallet
	 * @param signerAddress address of signer
	 * @param signature digital signature
	 */
	function _verifyAddressSigner(
		address sender,
		address signerAddress,
		bytes memory signature
	) private pure returns (bool) {
		bytes32 messageHash = keccak256(abi.encodePacked(sender));
		return signerAddress == messageHash.toEthSignedMessageHash().recover(signature);
	}

	/**
	 * @notice get total mint available count by role
	 * OG Billy: 2, Billy Plus: 1, Billy: 1
	 * @param sender address of wallet
	 * @param ogBillySignature digital signature of og billy
	 * @param billyPlusSignature digital signature of billy plus
	 * @param billySignature digital signature of billy
	 */
	function _getTotalMintAvailableCount(
		address sender,
		bytes memory ogBillySignature,
		bytes memory billyPlusSignature,
		bytes memory billySignature
	) private view returns (uint256) {
		uint256 availableMintAmount = 0;
		if (
			!_isEmptyStringBytes(ogBillySignature) &&
			_verifyAddressSigner(sender, _ogBillySignerAddress, ogBillySignature)
		) {
			availableMintAmount += 2;
		}
		if (
			!_isEmptyStringBytes(billyPlusSignature) &&
			_verifyAddressSigner(sender, _billyPlusSignerAddress, billyPlusSignature)
		) {
			availableMintAmount += 1;
		}
		if (!_isEmptyStringBytes(billySignature) && _verifyAddressSigner(sender, _billySignerAddress, billySignature)) {
			availableMintAmount += 1;
		}
		return availableMintAmount;
	}

	/**
	 * @notice check bytes is empty string
	 * @param data bytes data
	 */
	function _isEmptyStringBytes(bytes memory data) private pure returns (bool) {
		if (data.length == 0) {
			return true;
		}
		for (uint256 i = 0; i < data.length; i++) {
			if (data[i] != 0x00) {
				return false;
			}
		}
		return true;
	}
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SignedMath.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(uint256 x, uint256 y, uint256 denominator, Rounding rounding) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10 ** 64) {
                value /= 10 ** 64;
                result += 64;
            }
            if (value >= 10 ** 32) {
                value /= 10 ** 32;
                result += 32;
            }
            if (value >= 10 ** 16) {
                value /= 10 ** 16;
                result += 16;
            }
            if (value >= 10 ** 8) {
                value /= 10 ** 8;
                result += 8;
            }
            if (value >= 10 ** 4) {
                value /= 10 ** 4;
                result += 4;
            }
            if (value >= 10 ** 2) {
                value /= 10 ** 2;
                result += 2;
            }
            if (value >= 10 ** 1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10 ** result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 256, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result << 3) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(bytes32 hash, bytes32 r, bytes32 vs) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, "\x19Ethereum Signed Message:\n32")
            mstore(0x1c, hash)
            message := keccak256(0x00, 0x3c)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\x19\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            data := keccak256(ptr, 0x42)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Data with intended validator, created from a
     * `validator` and `data` according to the version 0 of EIP-191.
     *
     * See {recover}.
     */
    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x00", validator, data));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = Math.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, Math.log256(value) + 1);
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// 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
// OpenZeppelin Contracts (last updated v4.9.0) (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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        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);
    }
}

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

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"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":true,"internalType":"address","name":"previousContract","type":"address"},{"indexed":true,"internalType":"address","name":"newContract","type":"address"}],"name":"TZRKTContractChanged","type":"event"},{"inputs":[],"name":"checkBillyMintTime","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkBillyPlusMintTime","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkOgBillyMintTime","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCurrentBlockTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"bytes","name":"ogBillySignature","type":"bytes"},{"internalType":"bytes","name":"billyPlusSignature","type":"bytes"},{"internalType":"bytes","name":"billySignature","type":"bytes"}],"name":"getMintAvailableCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"ogBillySignature","type":"bytes"},{"internalType":"bytes","name":"billyPlusSignature","type":"bytes"},{"internalType":"bytes","name":"billySignature","type":"bytes"}],"name":"mintBilly","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"ogBillySignature","type":"bytes"},{"internalType":"bytes","name":"billyPlusSignature","type":"bytes"},{"internalType":"bytes","name":"billySignature","type":"bytes"}],"name":"mintBillyPlus","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"ogBillySignature","type":"bytes"},{"internalType":"bytes","name":"billyPlusSignature","type":"bytes"},{"internalType":"bytes","name":"billySignature","type":"bytes"}],"name":"mintOgBilly","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"}],"name":"setBillyMintTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"}],"name":"setBillyPlusMintTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSigner","type":"address"}],"name":"setBillyPlusSignerAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSigner","type":"address"}],"name":"setBillySignerAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"startTime","type":"uint256"},{"internalType":"uint256","name":"endTime","type":"uint256"}],"name":"setOgBillyMintTime","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newSigner","type":"address"}],"name":"setOgBillySignerAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newTzrktContract","type":"address"}],"name":"setTZRKTContract","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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