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Contract

0x92e6F37F41F78B7Dd64d9741E2abD304Cc3d9f0e

Overview

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0 ETH

ETH Value

$0.00

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Transaction Hash
Method
Block
From
To
Use Vending Mach...55000682025-03-30 22:49:258 secs ago1743374965IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000010620.04525
Use Vending Mach...54997812025-03-30 22:44:295 mins ago1743374669IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000012730.04525
Use Vending Mach...54997472025-03-30 22:43:545 mins ago1743374634IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000008240.04525
Use Vending Mach...54992912025-03-30 22:36:0213 mins ago1743374162IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000034060.04525
Use Vending Mach...54992212025-03-30 22:34:5014 mins ago1743374090IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000013740.04525
Use Vending Mach...54992142025-03-30 22:34:2715 mins ago1743374067IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000013330.04525
Use Vending Mach...54991762025-03-30 22:33:4915 mins ago1743374029IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000008580.04525
Use Vending Mach...54991692025-03-30 22:33:4215 mins ago1743374022IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000015860.04525
Use Vending Mach...54991432025-03-30 22:33:1616 mins ago1743373996IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000008580.04525
Use Vending Mach...54991382025-03-30 22:33:1016 mins ago1743373990IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000015370.04525
Use Vending Mach...54991092025-03-30 22:32:4116 mins ago1743373961IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000008580.04525
Use Vending Mach...54990632025-03-30 22:31:5317 mins ago1743373913IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000015630.04525
Use Vending Mach...54990352025-03-30 22:31:2518 mins ago1743373885IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.00001070.04525
Use Vending Mach...54982212025-03-30 22:17:1532 mins ago1743373035IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.0000160.04525
Use Vending Mach...54981972025-03-30 22:16:4932 mins ago1743373009IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000012030.04525
Use Vending Mach...54980602025-03-30 22:14:2435 mins ago1743372864IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000013850.04525
Use Vending Mach...54979342025-03-30 22:12:0937 mins ago1743372729IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000010680.04525
Use Vending Mach...54979332025-03-30 22:12:0837 mins ago1743372728IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000035580.04525
Use Vending Mach...54978652025-03-30 22:10:5538 mins ago1743372655IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000011670.04525
Use Vending Mach...54973682025-03-30 22:02:0847 mins ago1743372128IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000016190.04525
Use Vending Mach...54973392025-03-30 22:01:3947 mins ago1743372099IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000013950.04525
Use Vending Mach...54973272025-03-30 22:01:2648 mins ago1743372086IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000010670.04525
Use Vending Mach...54973132025-03-30 22:01:0948 mins ago1743372069IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000008760.04525
Use Vending Mach...54973072025-03-30 22:01:0348 mins ago1743372063IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000014150.04525
Use Vending Mach...54972742025-03-30 22:00:3049 mins ago1743372030IN
0x92e6F37F...4Cc3d9f0e
0 ETH0.000008760.04525
View all transactions

Latest 1 internal transaction

Parent Transaction Hash Block From To
49739652025-03-24 16:33:136 days ago1742833993  Contract Creation0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
Dabble

Compiler Version
v0.8.24+commit.e11b9ed9

ZkSolc Version
v1.5.11

Optimization Enabled:
Yes with Mode 3

Other Settings:
paris EvmVersion
File 1 of 13 : Dabble.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/token/ERC1155/utils/ERC1155Receiver.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";

contract Dabble is Ownable, ERC1155Receiver, ReentrancyGuard {

    IERC20 public usdc;

    address public feeRecipient = 0x2f2A13462f6d4aF64954ee84641D265932849b64;
    address public signerAddress = 0xf156ed63C0b6D07132Fa8704FB09EAa76fF30EE4;

    mapping(uint256 => VendingMachine) public vendingMachines;
    mapping(uint256 => VendingMachineItem[]) public vendingMachineItems;

    mapping(address => VendingState) public vendingStates;
    mapping(address => uint256) public nonces;
    mapping(address => mapping(uint256 => bool)) public nonceUsed;

    uint256 public vendingMachineId = 1;
    uint256 public fee = 0;

    struct VendingMachine {
        address owner;
        bool isActive;
        uint256 totalWeight;
    }

    struct VendingMachineItem {
        address contractAddress;
        uint256 itemId;
        uint256 quantity;
        uint256 itemsPerWin;
        uint256 weight;
        uint256 buyBackPrice;
    }

    struct VendingState {
        uint256 vendingMachineId;
        uint256 blockNumber;
        uint256 cost;
        uint256 boost;
    }

    struct CommitVendingMachineParams {
        address user;
        uint256 vendingMachineId;
        uint256 nonce;
        uint256 boost;
        uint256 cost;
        uint256 fee;
        bytes signature;
        bool permissioned;
    }

    modifier checkNonce(address user, uint256 nonce) {
        require(!nonceUsed[user][nonce], "Invalid nonce");
        nonceUsed[user][nonce] = true;
        nonces[user]++;
        _;
    }

    // ------------------------------------------------------
    //               Vending Machine Creation
    // ------------------------------------------------------
    function createVendingMachine(
        address _owner,
        VendingMachineItem[] memory _items
    ) public onlyOwner {
        _addItemsToVendingMachine(_owner, vendingMachineId, _items);
        vendingMachineId++;
    }

    function _addItemsToVendingMachine(
        address _owner,
        uint256 _vendingMachineId,
        VendingMachineItem[] memory _items
    ) internal {
        vendingMachines[_vendingMachineId] = VendingMachine({
            owner: _owner,
            isActive: true,
            totalWeight: 0
        });

        uint256 previousWeight = 0;
        uint256 totalWeight = 0;

        for (uint256 i = 0; i < _items.length; i++) {
            VendingMachineItem memory item = _items[i];
            vendingMachineItems[_vendingMachineId].push(item);

            require(previousWeight <= item.weight, "Weights must be in ascending order");
            require(item.quantity > 0, "Quantity must be greater than 0");
            require(item.itemsPerWin > 0, "itemsPerWin must be greater than 0");
            require(item.quantity % item.itemsPerWin == 0, "Quantity must be divisible by itemsPerWin");

            totalWeight += item.weight;
            previousWeight = item.weight;

            IERC1155(item.contractAddress).safeTransferFrom(
                msg.sender,
                address(this),
                item.itemId,
                item.quantity,
                ""
            );
        }

        vendingMachines[_vendingMachineId].totalWeight = totalWeight;
    }

    // ------------------------------------------------------
    //               Add Items to Vending Machine
    // ------------------------------------------------------
    function addToVendingMachine(uint256 _vendingMachineId, VendingMachineItem[] memory _items) 
        public 
        onlyOwner 
    {
        closeVendingMachine(_vendingMachineId, false);

        _addItemsToVendingMachine(msg.sender, _vendingMachineId, _items);
    }

    // ------------------------------------------------------
    //               Closing Vending Machine
    // ------------------------------------------------------
    function closeVendingMachine(uint256 _vendingMachineId, bool _isActive)
        public
        onlyOwner
    {
        require(vendingMachines[_vendingMachineId].isActive, "Vending machine is not active");
        vendingMachines[_vendingMachineId].isActive = _isActive;

        for (uint256 i = 0; i < vendingMachineItems[_vendingMachineId].length; i++) {
            VendingMachineItem memory item = vendingMachineItems[_vendingMachineId][i];
            if (item.quantity == 0) continue;

            IERC1155(item.contractAddress).safeTransferFrom(
                address(this),
                vendingMachines[_vendingMachineId].owner,
                item.itemId,
                item.quantity,
                ""
            );
        }

        delete vendingMachineItems[_vendingMachineId];
    }

    // ------------------------------------------------------
    //                 Commit Phase
    // ------------------------------------------------------
    function useVendingMachineCommit(CommitVendingMachineParams memory _params)
        public
        nonReentrant
        checkNonce(_params.user, _params.nonce)
    {
        VendingMachine storage vendingMachine = vendingMachines[_params.vendingMachineId];
        require(vendingMachine.isActive, "Vending machine is not active");
        require(vendingStates[_params.user].vendingMachineId == 0, "Already committed");

        if(!_params.permissioned) {
            require(msg.sender == _params.user, "Not authorized");
        }

        bytes32 hash = ECDSA.toEthSignedMessageHash(
            keccak256(
                abi.encode(
                    _params.user,
                    _params.permissioned,
                    _params.nonce,
                    _params.boost,
                    _params.cost,
                    _params.fee,
                    _params.vendingMachineId
                )
            )
        );

        require(_verify(hash, _params.signature), "Invalid signature");

        if (_params.cost > 0) {
            require(
                usdc.transferFrom(_params.user, address(this), _params.cost),
                "Transfer failed"
            );
        }

        if (_params.fee > 0) {
            require(
                usdc.transferFrom(_params.user, feeRecipient, _params.fee),
                "Transfer failed"
            );
        }

        vendingStates[_params.user] = VendingState({
            vendingMachineId: _params.vendingMachineId,
            blockNumber: block.number + 2,
            cost: _params.cost,
            boost: _params.boost
        });
    }

    // ------------------------------------------------------
    //              getVendingMachineReward
    // ------------------------------------------------------
    function getVendingMachineReward(address _user, bytes32 _blockHash, uint256 rewardNonce)
        public
        view
        returns (uint256)
    {
        uint256 _vendingMachineId = vendingStates[_user].vendingMachineId;
        VendingMachine memory vendingMachine = vendingMachines[_vendingMachineId];

        uint256 totalWeight = vendingMachine.totalWeight;

        if(vendingStates[_user].boost > 0) {
            totalWeight += vendingStates[_user].boost * vendingMachineItems[_vendingMachineId].length;
        }

        uint256 randomNumber = getRandomNumber(totalWeight, _blockHash, rewardNonce);

        uint256 itemToReceiveId = 0;
        uint256 cumulativeWeight = 0;

        uint256 itemsAvailable = 0;

        for (uint256 i = 0; i < vendingMachineItems[_vendingMachineId].length; i++) {
            VendingMachineItem memory item = vendingMachineItems[_vendingMachineId][i];
            itemsAvailable += item.quantity;
        }

        if (itemsAvailable == 0) {
            return vendingMachineItems[_vendingMachineId].length;
        }

        for (uint256 i = 0; i < vendingMachineItems[_vendingMachineId].length; i++) {
            VendingMachineItem memory item = vendingMachineItems[_vendingMachineId][i];
            cumulativeWeight += (item.weight + vendingStates[_user].boost);

            if (randomNumber < cumulativeWeight) {
                itemToReceiveId = i;
                break;
            }
        }

        for (uint256 i = itemToReceiveId; i < vendingMachineItems[_vendingMachineId].length; i++) {
            VendingMachineItem memory item = vendingMachineItems[_vendingMachineId][i];
            if (item.quantity >= item.itemsPerWin) {
                itemToReceiveId = i;
                break;
            }
            itemToReceiveId = i + 1;
        }

        uint256 length_ = vendingMachineItems[_vendingMachineId].length;
        if (itemToReceiveId >= length_) {
            return length_;
        }

        return itemToReceiveId;
    }

    // ------------------------------------------------------
    //               Finalize Phase
    // ------------------------------------------------------
    function useVendingMachineFinalize(
        address _user,
        uint256 _nonce,
        bytes32 _blockHash,
        bytes memory _signature,
        bool _buyBack,
        bool _permissioned,
        bool _buyBackOverride,
        uint256 rewardNonce
    ) 
        public 
        nonReentrant
        checkNonce(_user, _nonce) 
    {
        require(vendingStates[_user].vendingMachineId != 0, "Not committed");
        uint256 _vendingMachineId = vendingStates[_user].vendingMachineId;

        if (!_permissioned) {
            require(msg.sender == _user, "Not authorized");
        }

        require(block.number > vendingStates[_user].blockNumber, "Not enough blocks passed");

        bytes32 hash = ECDSA.toEthSignedMessageHash(
            keccak256(
                abi.encode(
                    _user,
                    _nonce,
                    _blockHash,
                    _vendingMachineId,
                    _buyBack,
                    _permissioned,
                    _buyBackOverride,
                    rewardNonce
                )
            )
        );
        require(_verify(hash, _signature), "Invalid signature");

        uint256 itemToReceiveId = getVendingMachineReward(_user, _blockHash, rewardNonce);

        _useVendingMachineFinalize(_user, itemToReceiveId, _buyBack, _vendingMachineId, _buyBackOverride);
    }

    function _useVendingMachineFinalize(
        address _user,
        uint256 _itemToReceiveId,
        bool _buyBack,
        uint256 _vendingMachineId,
        bool _buyBackOverride
    ) 
        internal 
    {
        uint256 _cost = vendingStates[_user].cost;

        vendingStates[_user] = VendingState({
            vendingMachineId: 0,
            blockNumber: 0,
            cost: 0,
            boost: 0
        });

        if (_buyBackOverride) {
            return;
        }

        if (_itemToReceiveId == vendingMachineItems[_vendingMachineId].length) {
            if (_cost > 0) {
                IERC20(usdc).transfer(_user, _cost);
            }
            return;
        }

        VendingMachineItem storage itemToReceive = vendingMachineItems[_vendingMachineId][_itemToReceiveId];

        if (_buyBack) {
            if (itemToReceive.buyBackPrice > 0) {
                IERC20(usdc).transfer(_user, itemToReceive.buyBackPrice);
            }
            return;
        }

        if (_cost > 0) {
            IERC20(usdc).transfer(owner(), _cost);
        }

        itemToReceive.quantity -= itemToReceive.itemsPerWin;

        IERC1155(itemToReceive.contractAddress).safeTransferFrom(
            address(this),
            _user,
            itemToReceive.itemId,
            itemToReceive.itemsPerWin,
            ""
        );
    }

    function getItemsLeftInVendingMachine(uint256 _vendingMachineId) public view returns (uint256) {
        uint256 itemsAvailable = 0;

        for (uint256 i = 0; i < vendingMachineItems[_vendingMachineId].length; i++) {
            VendingMachineItem memory item = vendingMachineItems[_vendingMachineId][i];
            itemsAvailable += item.quantity;
        }

        return itemsAvailable;
    }

    // ------------------------------------------------------
    //           Signature Verification & Helpers
    // ------------------------------------------------------
    function setSigner(address _newSigner) public onlyOwner {
        signerAddress = _newSigner;
    }

    function _verify(bytes32 hash, bytes memory signature)
        internal
        view
        returns (bool)
    {
        address recovered = ECDSA.recover(hash, signature);
        return recovered == signerAddress;
    }

    function getVendingMachineItem(uint256 _vendingMachineId, uint256 index)
        public
        view
        returns (
            address contractAddress,
            uint256 itemId,
            uint256 quantity,
            uint256 itemsPerWin,
            uint256 weight,
            uint256 buyBackPrice
        )
    {
        VendingMachineItem memory item = vendingMachineItems[_vendingMachineId][index];
        return (
            item.contractAddress,
            item.itemId,
            item.quantity,
            item.itemsPerWin,
            item.weight,
            item.buyBackPrice
        );
    }

    // ------------------------------------------------------
    //         ERC1155Receiver Implementation
    // ------------------------------------------------------
    function onERC1155Received(
        address,
        address,
        uint256,
        uint256,
        bytes memory
    )
        public
        virtual
        override
        returns (bytes4)
    {
        return this.onERC1155Received.selector;
    }

    function onERC1155BatchReceived(
        address,
        address,
        uint256[] memory,
        uint256[] memory,
        bytes memory
    )
        public
        virtual
        override
        returns (bytes4)
    {
        return this.onERC1155BatchReceived.selector;
    }

    function supportsInterface(bytes4 interfaceId) 
        public 
        view 
        virtual 
        override 
        returns (bool)
    {
        return interfaceId == type(IERC1155Receiver).interfaceId;
    }

    // ------------------------------------------------------
    //                 Admin Functions
    // ------------------------------------------------------
    function setUSDC(address _usdc) external onlyOwner {
        usdc = IERC20(_usdc);
    }

    function setFee(uint256 _fee) external onlyOwner {
        fee = _fee;
    }

    function withdraw() external onlyOwner {
        IERC20(usdc).transfer(owner(), IERC20(usdc).balanceOf(address(this)));
    }

    function getRandomNumber(uint256 totalWeight, bytes32 _blockHash, uint256 rewardNonce) public pure returns (uint256) {
        bytes32 blockHash = keccak256(abi.encodePacked(_blockHash, rewardNonce));
        return uint256(blockHash) % totalWeight;
    }
}

File 2 of 13 : IERC20.sol
// 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);
}

File 3 of 13 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (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 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);
    }
}

File 4 of 13 : ECDSA.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @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) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

File 5 of 13 : IERC1155.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC1155/IERC1155.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC1155 compliant contract, as defined in the
 * https://eips.ethereum.org/EIPS/eip-1155[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155 is IERC165 {
    /**
     * @dev Emitted when `value` tokens of token type `id` are transferred from `from` to `to` by `operator`.
     */
    event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value);

    /**
     * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all
     * transfers.
     */
    event TransferBatch(
        address indexed operator,
        address indexed from,
        address indexed to,
        uint256[] ids,
        uint256[] values
    );

    /**
     * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to
     * `approved`.
     */
    event ApprovalForAll(address indexed account, address indexed operator, bool approved);

    /**
     * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI.
     *
     * If an {URI} event was emitted for `id`, the standard
     * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value
     * returned by {IERC1155MetadataURI-uri}.
     */
    event URI(string value, uint256 indexed id);

    /**
     * @dev Returns the amount of tokens of token type `id` owned by `account`.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) external view returns (uint256);

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids)
        external
        view
        returns (uint256[] memory);

    /**
     * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`,
     *
     * Emits an {ApprovalForAll} event.
     *
     * Requirements:
     *
     * - `operator` cannot be the caller.
     */
    function setApprovalForAll(address operator, bool approved) external;

    /**
     * @dev Returns true if `operator` is approved to transfer ``account``'s tokens.
     *
     * See {setApprovalForAll}.
     */
    function isApprovedForAll(address account, address operator) external view returns (bool);

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If the caller is not `from`, it must have been approved to spend ``from``'s tokens via {setApprovalForAll}.
     * - `from` must have a balance of tokens of type `id` of at least `amount`.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes calldata data
    ) external;

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the
     * acceptance magic value.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] calldata ids,
        uint256[] calldata amounts,
        bytes calldata data
    ) external;
}

File 6 of 13 : ERC1155Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC1155/utils/ERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "../IERC1155Receiver.sol";
import "../../../utils/introspection/ERC165.sol";

/**
 * @dev _Available since v3.1._
 */
abstract contract ERC1155Receiver is ERC165, IERC1155Receiver {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return interfaceId == type(IERC1155Receiver).interfaceId || super.supportsInterface(interfaceId);
    }
}

File 7 of 13 : ReentrancyGuard.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be _NOT_ENTERED
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

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

File 8 of 13 : Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.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 `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);
    }
}

File 9 of 13 : ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

File 10 of 13 : Context.sol
// 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;
    }
}

File 11 of 13 : IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 12 of 13 : IERC1155Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC1155/IERC1155Receiver.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev _Available since v3.1._
 */
interface IERC1155Receiver is IERC165 {
    /**
     * @dev Handles the receipt of a single ERC1155 token type. This function is
     * called at the end of a `safeTransferFrom` after the balance has been updated.
     *
     * NOTE: To accept the transfer, this must return
     * `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))`
     * (i.e. 0xf23a6e61, or its own function selector).
     *
     * @param operator The address which initiated the transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param id The ID of the token being transferred
     * @param value The amount of tokens being transferred
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed
     */
    function onERC1155Received(
        address operator,
        address from,
        uint256 id,
        uint256 value,
        bytes calldata data
    ) external returns (bytes4);

    /**
     * @dev Handles the receipt of a multiple ERC1155 token types. This function
     * is called at the end of a `safeBatchTransferFrom` after the balances have
     * been updated.
     *
     * NOTE: To accept the transfer(s), this must return
     * `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))`
     * (i.e. 0xbc197c81, or its own function selector).
     *
     * @param operator The address which initiated the batch transfer (i.e. msg.sender)
     * @param from The address which previously owned the token
     * @param ids An array containing ids of each token being transferred (order and length must match values array)
     * @param values An array containing amounts of each token being transferred (order and length must match ids array)
     * @param data Additional data with no specified format
     * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed
     */
    function onERC1155BatchReceived(
        address operator,
        address from,
        uint256[] calldata ids,
        uint256[] calldata values,
        bytes calldata data
    ) external returns (bytes4);
}

File 13 of 13 : Math.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (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) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 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 10, 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 * 8) < value ? 1 : 0);
        }
    }
}

Settings
{
  "optimizer": {
    "enabled": true,
    "mode": "3"
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "abi"
      ]
    }
  },
  "detectMissingLibraries": false,
  "forceEVMLA": false,
  "enableEraVMExtensions": true,
  "codegen": "evmla",
  "libraries": {}
}

Contract Security Audit

Contract ABI

API
[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"uint256","name":"_vendingMachineId","type":"uint256"},{"components":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"uint256","name":"itemId","type":"uint256"},{"internalType":"uint256","name":"quantity","type":"uint256"},{"internalType":"uint256","name":"itemsPerWin","type":"uint256"},{"internalType":"uint256","name":"weight","type":"uint256"},{"internalType":"uint256","name":"buyBackPrice","type":"uint256"}],"internalType":"struct Dabble.VendingMachineItem[]","name":"_items","type":"tuple[]"}],"name":"addToVendingMachine","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_vendingMachineId","type":"uint256"},{"internalType":"bool","name":"_isActive","type":"bool"}],"name":"closeVendingMachine","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"},{"components":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"uint256","name":"itemId","type":"uint256"},{"internalType":"uint256","name":"quantity","type":"uint256"},{"internalType":"uint256","name":"itemsPerWin","type":"uint256"},{"internalType":"uint256","name":"weight","type":"uint256"},{"internalType":"uint256","name":"buyBackPrice","type":"uint256"}],"internalType":"struct Dabble.VendingMachineItem[]","name":"_items","type":"tuple[]"}],"name":"createVendingMachine","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeRecipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_vendingMachineId","type":"uint256"}],"name":"getItemsLeftInVendingMachine","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"totalWeight","type":"uint256"},{"internalType":"bytes32","name":"_blockHash","type":"bytes32"},{"internalType":"uint256","name":"rewardNonce","type":"uint256"}],"name":"getRandomNumber","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"_vendingMachineId","type":"uint256"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"getVendingMachineItem","outputs":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"uint256","name":"itemId","type":"uint256"},{"internalType":"uint256","name":"quantity","type":"uint256"},{"internalType":"uint256","name":"itemsPerWin","type":"uint256"},{"internalType":"uint256","name":"weight","type":"uint256"},{"internalType":"uint256","name":"buyBackPrice","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"bytes32","name":"_blockHash","type":"bytes32"},{"internalType":"uint256","name":"rewardNonce","type":"uint256"}],"name":"getVendingMachineReward","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"nonceUsed","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"uint256[]","name":"","type":"uint256[]"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155BatchReceived","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"onERC1155Received","outputs":[{"internalType":"bytes4","name":"","type":"bytes4"}],"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":"_fee","type":"uint256"}],"name":"setFee","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newSigner","type":"address"}],"name":"setSigner","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_usdc","type":"address"}],"name":"setUSDC","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"signerAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"usdc","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"user","type":"address"},{"internalType":"uint256","name":"vendingMachineId","type":"uint256"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"boost","type":"uint256"},{"internalType":"uint256","name":"cost","type":"uint256"},{"internalType":"uint256","name":"fee","type":"uint256"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"bool","name":"permissioned","type":"bool"}],"internalType":"struct Dabble.CommitVendingMachineParams","name":"_params","type":"tuple"}],"name":"useVendingMachineCommit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"uint256","name":"_nonce","type":"uint256"},{"internalType":"bytes32","name":"_blockHash","type":"bytes32"},{"internalType":"bytes","name":"_signature","type":"bytes"},{"internalType":"bool","name":"_buyBack","type":"bool"},{"internalType":"bool","name":"_permissioned","type":"bool"},{"internalType":"bool","name":"_buyBackOverride","type":"bool"},{"internalType":"uint256","name":"rewardNonce","type":"uint256"}],"name":"useVendingMachineFinalize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"vendingMachineId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"vendingMachineItems","outputs":[{"internalType":"address","name":"contractAddress","type":"address"},{"internalType":"uint256","name":"itemId","type":"uint256"},{"internalType":"uint256","name":"quantity","type":"uint256"},{"internalType":"uint256","name":"itemsPerWin","type":"uint256"},{"internalType":"uint256","name":"weight","type":"uint256"},{"internalType":"uint256","name":"buyBackPrice","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"vendingMachines","outputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"bool","name":"isActive","type":"bool"},{"internalType":"uint256","name":"totalWeight","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"vendingStates","outputs":[{"internalType":"uint256","name":"vendingMachineId","type":"uint256"},{"internalType":"uint256","name":"blockNumber","type":"uint256"},{"internalType":"uint256","name":"cost","type":"uint256"},{"internalType":"uint256","name":"boost","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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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.