Contract 0x7EeF591A6CC0403b9652E98E88476fe1bF31dDeb 4

 
 
Txn Hash
Method
Block
From
To
Value
0x99487e3eca62a59672f5020c3b632373b633d925835d6be86006ef1f002054c4Online Applicati...(pending)2022-08-07 2:20:182 days 3 hrs ago0xf5adcb260b3ccc74be5a5048576e81bbb4c53f85 IN CityDAO: Token0.25 Ether(Pending)(Pending)
0xeb2161df5fb1d07ea0a82ba6b21881955917a7bf3449800bcc73e411c4c3b626Set Approval For...153051542022-08-09 1:46:523 hrs 54 mins agoENS Name 9371.eth IN  CityDAO: Token0 Ether0.0007665 16.62479356
0x75940c4535baed7abbb26bd3934b806e949dadab3ba7d89191a7f20c4246dd42Set Approval For...153041642022-08-08 22:06:447 hrs 34 mins agoENS Name sobeash.eth IN  CityDAO: Token0 Ether0.00040442 15.39040893
0xd4e41f19a1c97aa39151c84a2be0bfd6fc106fdfc66e02c6c4da7f6e1a16ae81Set Approval For...153041622022-08-08 22:06:257 hrs 35 mins agoENS Name sobeash.eth IN  CityDAO: Token0 Ether0.00040443 16.65854535
0x270a37f910a87e576e0c99e7c4dd2cc0495ef9ba8fbd3879711354f48cebad14Safe Transfer Fr...153030592022-08-08 18:08:1211 hrs 33 mins agoENS Name scofi.eth IN  CityDAO: Token0 Ether0.00192195 37.66398328
0xc71dd7c437bd55fdea41c88e3a4564a5cded4f03a8775350f12002c525a71999Set Approval For...153003742022-08-08 8:01:3421 hrs 40 mins agoENS Name gemfinder.eth IN  CityDAO: Token0 Ether0.00052857 11.4644333
0x630e90c4836a3ac4bdad94375d6d67ca5c05d4769561c3c3ff16bc3a4a9cd80cSet Approval For...152985872022-08-08 1:02:271 day 4 hrs agoENS Name blackiron.eth IN  CityDAO: Token0 Ether0.000368848
0x0402eaaa7aba59caec0925e9e9780fe7e0892aedd5878425551415fc674cfa03Set Approval For...152984932022-08-08 0:42:551 day 4 hrs agoENS Name reply-with-your-ens.eth IN  CityDAO: Token0 Ether0.00042382 9.19238472
0x925288bfac952cbffdb39ac385287403c2b75ab564bf2ea554c0383aab1d1f17Safe Transfer Fr...152972112022-08-07 19:56:551 day 9 hrs agoENS Name chrismcbride.eth IN  CityDAO: Token0 Ether0.00096854 18.71214906
0x2714f73ad9e7554408de80382274336ed602a1b47b6b4e9ee57b3003580a1750Safe Transfer Fr...152960892022-08-07 15:48:121 day 13 hrs ago0x9bebcbe78c403414909e8e06d07f0e19adef0292 IN  CityDAO: Token0 Ether0.0005695 11.00275228
0x3a36ff5bf1745bd0f86e2a7422fa8cb36fd41418773d533b055edd3cf983bad8Set Approval For...152950732022-08-07 12:11:121 day 17 hrs agoENS Name mymoneyisgone.eth IN  CityDAO: Token0 Ether0.00080332 17.42348171
0x05617cc500f11494c24dcc9c8e78b912a069cda43dce06796f75fe546fcf9646Safe Transfer Fr...152891822022-08-06 14:05:302 days 15 hrs agoENS Name daoventure.eth IN  CityDAO: Token0 Ether0.00067304 19.42511678
0xc9de611090ed2f5310b71c66aa5ee6b746672205d0f61a4ef053ec6deb518665Safe Transfer Fr...152891772022-08-06 14:03:592 days 15 hrs agoENS Name daoventure.eth IN  CityDAO: Token0 Ether0.00086822 15.3536946
0x5d05b89f91975cd50e70cb7bc778826b39e10f8ba38fc0da1bc1962e447d8884Set Approval For...152891182022-08-06 13:52:202 days 15 hrs ago0xf18e0afc9b7f693539a5f60252eb670cb90da9c8 IN  CityDAO: Token0 Ether0.00040387 8.75965126
0x2d0c51557362b6c9e678b7d5aa32a1d68c668b0ea472c212b5848ce8e33de22fSet Approval For...152864512022-08-06 3:53:073 days 1 hr ago0xeac4824eecc66901ef40309cb3a4939cff57ffb9 IN  CityDAO: Token0 Ether0.00062301 13.51258385
0x40179076d41b85b66a879488aa33a493e538bf206d50f45742c46d6dd4f5a33fSet Approval For...152835592022-08-05 17:01:363 days 12 hrs ago0xb646192e1c8f5afd1faf51fb48918e6eceba76ca IN  CityDAO: Token0 Ether0.00187167 40.59512448
0x6d4d289ed9206654401d7b413934e50eb25430ebff76d299a57696f58bf15050Safe Transfer Fr...152835492022-08-05 17:00:003 days 12 hrs ago0x9b6bd60a75177b49a2bc3bbb250b06a7d0b6a956 IN  CityDAO: Token0 Ether0.00123264 23.74770995
0x286b390a6f873b37a3b88b98934e834695996564d9458641dbbc6875297d0670Set Approval For...152808062022-08-05 6:51:503 days 22 hrs ago0x9a7fb7435cb80a31b35b7f48be569b580934d0b3 IN  CityDAO: Token0 Ether0.00044383 9.6264532
0xc171c9e35013799fa7da29418d1e6bdd8e487a5ca5c599c2677020b64aab881aSet Approval For...152755792022-08-04 11:19:364 days 18 hrs ago0xd16fa3afd930a02b72657abc1ccdc8c9c3614bb1 IN  CityDAO: Token0 Ether0.00041787 9.06334771
0x1b601f9e0c35986093d3920b1b012164c8da661b4ba8485d4c926b750803f2d0Set Approval For...152720162022-08-03 21:58:165 days 7 hrs ago0x4395a98880d624a59371efe2c42cc57bd66da593 IN  CityDAO: Token0 Ether0.00057253 12.41788202
0x6004b4a175aa487a7a79f4396ccb0f78421ec32cb9f442cf20cf1cd0efcd47caSet Approval For...152700752022-08-03 14:46:145 days 14 hrs ago0x5cb5ac3da7ec2d183c954325ae45f1cab83b398e IN  CityDAO: Token0 Ether0.0012009426
0xaf2099339bbb3d6e2a7318fae02bacc456b50245c15f240c2895f2a6660457adSet Approval For...152688922022-08-03 10:12:355 days 19 hrs agoENS Name kp3214.eth IN  CityDAO: Token0 Ether0.00027288 11.23986674
0x19eda81efa95b9d9b7bb8f181cf45730528b359fd0f3366b6b779eaebc3bf808Set Approval For...152608172022-08-02 3:58:027 days 1 hr ago0xfc814d203ac98b8cfbdaafb93992d2522483dfcc IN  CityDAO: Token0 Ether0.0006925 15.01989963
0x76d5075cdfd098b5dd3add26bef078252eaa244e49e31278c69f25244b65e127Set Approval For...152596562022-08-01 23:37:277 days 6 hrs agoENS Name grayduck.eth IN  CityDAO: Token0 Ether0.00024277 9.99987824
0x71ce3a475ed3fa009a1080b3432291ffea6350c66f9e13a78da63cf41d72173cSet Approval For...152579892022-08-01 17:26:177 days 12 hrs agoENS Name nominetron.eth IN  CityDAO: Token0 Ether0.00151728 32.90852051
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OVERVIEW

Citizen NFT holders are citizens of CityDAO, granting community access and governance.

Latest 13 internal transactions
Parent Txn Hash Block From To Value
0x65626cbcc31f49857c277ab830839c8c5d396cf4db31b7ec8c24e487ed1a8d83136145982021-11-14 14:50:21267 days 14 hrs ago CityDAO: TokenCityDAO: Deployer747.5 Ether
0x0f61c06a7c8719cb29a0cf831e3eb3e4f6ae5bfeaa317d77892f1d127cb9e131136096392021-11-13 19:54:11268 days 9 hrs ago 0xac886baac9cb5205770ceb5bd9fee245b6d6ac20 CityDAO: Token0.25 Ether
0xcce5fbd8651a14d4cdcb4add749a598be15d50cb0532c82244e3e009c87794d6136049322021-11-13 2:05:37269 days 3 hrs ago CityDAO: TokenCityDAO: Deployer255.25 Ether
0x80cbb6a096547d9526d570085a813bc2f02bcf6f800cbc609c80ad65bc994d31135888632021-11-10 13:55:20271 days 15 hrs ago CityDAO: TokenCityDAO: Deployer147.25 Ether
0x728877895a3f955441675ec8555beafb801420d08ebfb5de28c06b8d4f14ca67135846012021-11-09 21:40:33272 days 8 hrs ago CityDAO: TokenCityDAO: Deployer134.75 Ether
0xc4cd605e40578670701859339088bf10acec76625d2e3e410d5d8f7e32cba5fd135703872021-11-07 16:18:55274 days 13 hrs ago CityDAO: Token0x33ed481f752f05a292346c71e16afbb0fe54865628 Ether
0xbdafda8d819cad217a0ee5ce59ebb0740ee2ccec6121db7d4659a34aab44a4d6135656912021-11-06 22:40:02275 days 7 hrs ago 0x9410564ff062fb16a80641e0cc18803e917f8d07 CityDAO: Token0.25 Ether
0x8a42ab427bb510c2927fe20550cb3c070ed68079ed4a3f79822aa279b62b4d4b135634482021-11-06 14:20:07275 days 15 hrs ago CityDAO: TokenCityDAO: Deployer93.5 Ether
0x4fed150c6c2cbe9c7cef5f2955e2e3aad29ce2dba542021c09bf86bc6ee049f6135458972021-11-03 19:54:56278 days 9 hrs ago CityDAO: TokenCityDAO: Deployer102.25 Ether
0xf90f528e788a4dc1761ce80a1cc1149644e0f48dad4a20e8e489765abbad4e58135444372021-11-03 14:41:35278 days 15 hrs ago 0x1d5880124d67af25e9646dba7381a2ff8f81adc5 CityDAO: Token0.25 Ether
0x84459afded14627073b052cea7f5d8ef71c1dea3f162afd62db4fde7639110ab135393182021-11-02 19:12:25279 days 10 hrs ago CityDAO: TokenCityDAO: Deployer25.25 Ether
0x3a33bbdb948484d90a1a5a46ed3523c2435a05876803d305bb33fc87d20843f3135378912021-11-02 13:53:00279 days 15 hrs ago CityDAO: TokenCityDAO: Deployer130.25 Ether
0xbd88d6aab18a6e450d14e28eb9f9e1b495b2afee7c61575865389c53ff1a62c8135336052021-11-01 21:31:53280 days 8 hrs ago 0x8614117946175757341b497b688c0c0662838e8e CityDAO: Token0.25 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
CitizenNFT

Compiler Version
v0.8.7+commit.e28d00a7

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2021-11-01
*/

// Verified using https://dapp.tools

// hevm: flattened sources of src/CitizenNFT.sol
// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0 >=0.8.7 <0.9.0;

////// lib/openzeppelin-contracts/contracts/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;
    }
}

////// lib/openzeppelin-contracts/contracts/access/Ownable.sol

/* pragma solidity ^0.8.0; */

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

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

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

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

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

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

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

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

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

////// lib/openzeppelin-contracts/contracts/security/ReentrancyGuard.sol

/* pragma solidity ^0.8.0; */

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

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

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

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

        _;

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

////// lib/openzeppelin-contracts/contracts/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);
}

////// lib/openzeppelin-contracts/contracts/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 be 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;
}

////// lib/openzeppelin-contracts/contracts/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.
        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. 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);
}

////// lib/openzeppelin-contracts/contracts/token/ERC1155/extensions/IERC1155MetadataURI.sol

/* pragma solidity ^0.8.0; */

/* import "../IERC1155.sol"; */

/**
 * @dev Interface of the optional ERC1155MetadataExtension interface, as defined
 * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP].
 *
 * _Available since v3.1._
 */
interface IERC1155MetadataURI is IERC1155 {
    /**
     * @dev Returns the URI for token type `id`.
     *
     * If the `\{id\}` substring is present in the URI, it must be replaced by
     * clients with the actual token type ID.
     */
    function uri(uint256 id) external view returns (string memory);
}

////// lib/openzeppelin-contracts/contracts/utils/Address.sol

/* pragma solidity ^0.8.0; */

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

////// lib/openzeppelin-contracts/contracts/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;
    }
}

////// lib/openzeppelin-contracts/contracts/token/ERC1155/ERC1155.sol

/* pragma solidity ^0.8.0; */

/* import "./IERC1155.sol"; */
/* import "./IERC1155Receiver.sol"; */
/* import "./extensions/IERC1155MetadataURI.sol"; */
/* import "../../utils/Address.sol"; */
/* import "../../utils/Context.sol"; */
/* import "../../utils/introspection/ERC165.sol"; */

/**
 * @dev Implementation of the basic standard multi-token.
 * See https://eips.ethereum.org/EIPS/eip-1155
 * Originally based on code by Enjin: https://github.com/enjin/erc-1155
 *
 * _Available since v3.1._
 */
contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI {
    using Address for address;

    // Mapping from token ID to account balances
    mapping(uint256 => mapping(address => uint256)) private _balances;

    // Mapping from account to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    // Used as the URI for all token types by relying on ID substitution, e.g. https://token-cdn-domain/{id}.json
    string private _uri;

    /**
     * @dev See {_setURI}.
     */
    constructor(string memory uri_) {
        _setURI(uri_);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC1155).interfaceId ||
            interfaceId == type(IERC1155MetadataURI).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC1155MetadataURI-uri}.
     *
     * This implementation returns the same URI for *all* token types. It relies
     * on the token type ID substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * Clients calling this function must replace the `\{id\}` substring with the
     * actual token type ID.
     */
    function uri(uint256) public view virtual override returns (string memory) {
        return _uri;
    }

    /**
     * @dev See {IERC1155-balanceOf}.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function balanceOf(address account, uint256 id) public view virtual override returns (uint256) {
        require(account != address(0), "ERC1155: balance query for the zero address");
        return _balances[id][account];
    }

    /**
     * @dev See {IERC1155-balanceOfBatch}.
     *
     * Requirements:
     *
     * - `accounts` and `ids` must have the same length.
     */
    function balanceOfBatch(address[] memory accounts, uint256[] memory ids)
        public
        view
        virtual
        override
        returns (uint256[] memory)
    {
        require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch");

        uint256[] memory batchBalances = new uint256[](accounts.length);

        for (uint256 i = 0; i < accounts.length; ++i) {
            batchBalances[i] = balanceOf(accounts[i], ids[i]);
        }

        return batchBalances;
    }

    /**
     * @dev See {IERC1155-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC1155-isApprovedForAll}.
     */
    function isApprovedForAll(address account, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[account][operator];
    }

    /**
     * @dev See {IERC1155-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not owner nor approved"
        );
        _safeTransferFrom(from, to, id, amount, data);
    }

    /**
     * @dev See {IERC1155-safeBatchTransferFrom}.
     */
    function safeBatchTransferFrom(
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) public virtual override {
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: transfer caller is not owner nor approved"
        );
        _safeBatchTransferFrom(from, to, ids, amounts, data);
    }

    /**
     * @dev Transfers `amount` tokens of token type `id` from `from` to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `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 memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, _asSingletonArray(id), _asSingletonArray(amount), data);

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }
        _balances[id][to] += amount;

        emit TransferSingle(operator, from, to, id, amount);

        _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_safeTransferFrom}.
     *
     * Emits a {TransferBatch} event.
     *
     * Requirements:
     *
     * - 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[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; ++i) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: insufficient balance for transfer");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
            _balances[id][to] += amount;
        }

        emit TransferBatch(operator, from, to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data);
    }

    /**
     * @dev Sets a new URI for all token types, by relying on the token type ID
     * substitution mechanism
     * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP].
     *
     * By this mechanism, any occurrence of the `\{id\}` substring in either the
     * URI or any of the amounts in the JSON file at said URI will be replaced by
     * clients with the token type ID.
     *
     * For example, the `https://token-cdn-domain/\{id\}.json` URI would be
     * interpreted by clients as
     * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json`
     * for token type ID 0x4cce0.
     *
     * See {uri}.
     *
     * Because these URIs cannot be meaningfully represented by the {URI} event,
     * this function emits no events.
     */
    function _setURI(string memory newuri) internal virtual {
        _uri = newuri;
    }

    /**
     * @dev Creates `amount` tokens of token type `id`, and assigns them to `to`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, _asSingletonArray(id), _asSingletonArray(amount), data);

        _balances[id][to] += amount;
        emit TransferSingle(operator, address(0), to, id, amount);

        _doSafeTransferAcceptanceCheck(operator, address(0), to, id, amount, data);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}.
     *
     * 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 _mintBatch(
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {
        require(to != address(0), "ERC1155: mint to the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, address(0), to, ids, amounts, data);

        for (uint256 i = 0; i < ids.length; i++) {
            _balances[ids[i]][to] += amounts[i];
        }

        emit TransferBatch(operator, address(0), to, ids, amounts);

        _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data);
    }

    /**
     * @dev Destroys `amount` tokens of token type `id` from `from`
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `from` must have at least `amount` tokens of token type `id`.
     */
    function _burn(
        address from,
        uint256 id,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, address(0), _asSingletonArray(id), _asSingletonArray(amount), "");

        uint256 fromBalance = _balances[id][from];
        require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
        unchecked {
            _balances[id][from] = fromBalance - amount;
        }

        emit TransferSingle(operator, from, address(0), id, amount);
    }

    /**
     * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}.
     *
     * Requirements:
     *
     * - `ids` and `amounts` must have the same length.
     */
    function _burnBatch(
        address from,
        uint256[] memory ids,
        uint256[] memory amounts
    ) internal virtual {
        require(from != address(0), "ERC1155: burn from the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

        _beforeTokenTransfer(operator, from, address(0), ids, amounts, "");

        for (uint256 i = 0; i < ids.length; i++) {
            uint256 id = ids[i];
            uint256 amount = amounts[i];

            uint256 fromBalance = _balances[id][from];
            require(fromBalance >= amount, "ERC1155: burn amount exceeds balance");
            unchecked {
                _balances[id][from] = fromBalance - amount;
            }
        }

        emit TransferBatch(operator, from, address(0), ids, amounts);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits a {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC1155: setting approval status for self");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning, as well as batched variants.
     *
     * The same hook is called on both single and batched variants. For single
     * transfers, the length of the `id` and `amount` arrays will be 1.
     *
     * Calling conditions (for each `id` and `amount` pair):
     *
     * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * of token type `id` will be  transferred to `to`.
     * - When `from` is zero, `amount` tokens of token type `id` will be minted
     * for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens of token type `id`
     * will be burned.
     * - `from` and `to` are never both zero.
     * - `ids` and `amounts` have the same, non-zero length.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual {}

    function _doSafeTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256 id,
        uint256 amount,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) {
                if (response != IERC1155Receiver.onERC1155Received.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _doSafeBatchTransferAcceptanceCheck(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) private {
        if (to.isContract()) {
            try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (
                bytes4 response
            ) {
                if (response != IERC1155Receiver.onERC1155BatchReceived.selector) {
                    revert("ERC1155: ERC1155Receiver rejected tokens");
                }
            } catch Error(string memory reason) {
                revert(reason);
            } catch {
                revert("ERC1155: transfer to non ERC1155Receiver implementer");
            }
        }
    }

    function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) {
        uint256[] memory array = new uint256[](1);
        array[0] = element;

        return array;
    }
}

////// lib/openzeppelin-contracts/contracts/utils/math/SafeMath.sol

/* pragma solidity ^0.8.0; */

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

////// src/Base64.sol
/* pragma solidity ^0.8.7; */

library Base64 {
    bytes internal constant TABLE =
        "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

    /// @notice Encodes some bytes to the base64 representation
    function encode(bytes memory data) internal pure returns (string memory) {
        uint256 len = data.length;
        if (len == 0) return "";

        // multiply by 4/3 rounded up
        uint256 encodedLen = 4 * ((len + 2) / 3);

        // Add some extra buffer at the end
        bytes memory result = new bytes(encodedLen + 32);

        bytes memory table = TABLE;

        assembly {
            let tablePtr := add(table, 1)
            let resultPtr := add(result, 32)

            for {
                let i := 0
            } lt(i, len) {

            } {
                i := add(i, 3)
                let input := and(mload(add(data, i)), 0xffffff)

                let out := mload(add(tablePtr, and(shr(18, input), 0x3F)))
                out := shl(8, out)
                out := add(
                    out,
                    and(mload(add(tablePtr, and(shr(12, input), 0x3F))), 0xFF)
                )
                out := shl(8, out)
                out := add(
                    out,
                    and(mload(add(tablePtr, and(shr(6, input), 0x3F))), 0xFF)
                )
                out := shl(8, out)
                out := add(
                    out,
                    and(mload(add(tablePtr, and(input, 0x3F))), 0xFF)
                )
                out := shl(224, out)

                mstore(resultPtr, out)

                resultPtr := add(resultPtr, 4)
            }

            switch mod(len, 3)
            case 1 {
                mstore(sub(resultPtr, 2), shl(240, 0x3d3d))
            }
            case 2 {
                mstore(sub(resultPtr, 1), shl(248, 0x3d))
            }

            mstore(result, encodedLen)
        }

        return string(result);
    }
}

////// src/IEIP2981.sol
/* pragma solidity ^0.8.0; */

/**
 * EIP-2981
 */
interface IEIP2981 {
    /**
     * bytes4(keccak256("royaltyInfo(uint256,uint256)")) == 0x2a55205a
     *
     * => 0x2a55205a = 0x2a55205a
     */
    function royaltyInfo(uint256 tokenId, uint256 value)
        external
        view
        returns (address, uint256);
}

////// src/IERC1155WithRoyalty.sol

/* pragma solidity ^0.8.0; */

/// @author: lifetimeapp.io && manifold.xyz

/**
 * Simple EIP2981 reference override implementation
 */
interface IERC1155WithRoyalty {
    function setTokenRoyalty(
        uint256 tokenId,
        address recipient,
        uint16 bps
    ) external;

    function setDefaultRoyalty(address recipient, uint16 bps) external;
}

////// src/CitizenNFT.sol
/* pragma solidity ^0.8.7; */

// ============ Imports ============

/* import "@openzeppelin/contracts/token/ERC1155/ERC1155.sol"; */
/* import "@openzeppelin/contracts/access/Ownable.sol"; */
/* import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; */
/* import "@openzeppelin/contracts/utils/math/SafeMath.sol"; */
/* import "./Base64.sol"; */
/* import "./IEIP2981.sol"; */
/* import "./IERC1155WithRoyalty.sol"; */

/// @notice Error library for centralised error messaging
library Errors {
    string constant invalidCitizenshipId = "Unknown Citizen NFT ID";
}

/// @title CitizenNFT
/// @author Odysseas Lamtzidis
/// @notice An ERC721 NFT that replaces the Citizen NFTs that are issued by the OpenSea Storefront Smart contract.
/// This smart contract enables users to either mint a new CitizenNFT or
/// "transfer" their Citizen NFTs from the OpenSea smart contract to this one.
contract CitizenNFT is
    ERC1155,
    Ownable,
    IERC1155WithRoyalty,
    IEIP2981,
    ReentrancyGuard
{
    // We use safemath to avoid under and over flows
    using SafeMath for uint256;
    // At the time of writing, a new CitizenNFT costs 0.25 ether.
    // This variable can change by the appropriate function
    uint256 private citizenshipStampCostInWei = 250000000000000000;
    // Internal Ids that are used to differentiate between the different Citizen NFTs
    uint256 private constant CITIZEN_NFT_ID = 42;
    uint256 private constant FOUNDING_NFT_ID = 69;
    uint256 private constant FIRST_NFT_ID = 7;
    // Events
    event LogEthDeposit(address);
    event CitizenLegislatureChanged(string, uint256);
    event NewCitizen(address, uint256, uint256);
    event TokenRoyaltySet(uint256 tokenId, address recipient, uint16 bps);
    event DefaultRoyaltySet(address recipient, uint16 bps);
    // ERC1155
    uint256 private mintedCitizensCounter = 0;
    uint256 private mintedFoundingCitizensCounter = 0;
    uint256 private mintedFirstCitizensCounter = 0;
    // EIP2981
    struct TokenRoyalty {
        address recipient;
        uint16 bps;
    }
    TokenRoyalty public defaultRoyalty;
    mapping(uint256 => TokenRoyalty) private _tokenRoyalties;
    // NFT metadata
    mapping(uint256 => string) private tokenURIs;
    mapping(uint256 => string) private citizenNFTDescriptions;
    //Initialisation
    bool private contractInitialized;
    uint256 private reservedCitizenships;

    /// @notice Initialise CitizenNFT smart contract with the appropriate address and ItemIds of the
    /// Open Sea shared storefront smart contract and the Citizen NFTs that are locked in it.
    constructor(address _royaltyRecipient, uint16 _royaltyBPS)
        Ownable()
        ERC1155("")
    {
        defaultRoyalty = TokenRoyalty(_royaltyRecipient, _royaltyBPS);
        tokenURIs[
            CITIZEN_NFT_ID
        ] = "https://gateway.pinata.cloud/ipfs/QmRRnuHVwhoYEHsTxzMcGdrCfthKTS65gnfUqDZkv6kbza";
        tokenURIs[
            FOUNDING_NFT_ID
        ] = "https://gateway.pinata.cloud/ipfs/QmSrKL6fhPYU6BbYrV97AJm3aM6naGWZK95QntXXZuGQrF";
        tokenURIs[
            FIRST_NFT_ID
        ] = "https://gateway.pinata.cloud/ipfs/Qmb6VmYiktfvNX3YkLosYwjUM82PcEkr2irZ4PWheYiG2b";
        citizenNFTDescriptions[CITIZEN_NFT_ID] = "CityDAO Citizen";
        citizenNFTDescriptions[FOUNDING_NFT_ID] = "CityDAO Founding Citizen";
        citizenNFTDescriptions[FIRST_NFT_ID] = "CityDAO First Citizen";
        contractInitialized = false;
        reservedCitizenships = 0;
    }

    ///@notice Request a new Citizen NFT from the owner of the smart contract.
    /// You can request any number of NFTs and pay `citizenshipStampCostInWei` per NFT
    ///@param _citizenNumber Number of Citizen NFTs to request

    function onlineApplicationForCitizenship(uint256 _citizenNumber)
        public
        payable
        nonReentrant
    {
        require(
            msg.value >= citizenshipStampCostInWei * _citizenNumber,
            "ser, the state machine needs oil"
        );
        require(
            this.balanceOf(this.owner(), CITIZEN_NFT_ID) - _citizenNumber >
                reservedCitizenships,
            "No available Citizenship"
        );
        _safeTransferFrom(
            this.owner(),
            msg.sender,
            CITIZEN_NFT_ID,
            _citizenNumber,
            ""
        );
    }

    ///@notice Mint new citizenNFTs to an address, usually that of CityDAO.
    ///@param _to Address to where the NFTs must be minted
    ///@param _citizenType ID for the Citizen NFT (42 for regular, 69 for founding, 7 for first)
    ///@param _numberOfCitizens The number of Citizen NFTs to be minted
    function issueNewCitizenships(
        address _to,
        uint256 _citizenType,
        uint256 _numberOfCitizens
    ) public onlyOwner {
        if (_citizenType == 42) {
            mintedCitizensCounter = mintedCitizensCounter.add(
                _numberOfCitizens
            );
        } else if (_citizenType == 69) {
            mintedFoundingCitizensCounter = mintedFoundingCitizensCounter.add(
                _numberOfCitizens
            );
        } else if (_citizenType == 7) {
            mintedFirstCitizensCounter = mintedFirstCitizensCounter.add(
                _numberOfCitizens
            );
        } else {
            revert(Errors.invalidCitizenshipId);
        }
        _mint(_to, _citizenType, _numberOfCitizens, "");
    }

    function initialCitizenship() external onlyOwner {
        require(contractInitialized == false, "contract initialized already");
        issueNewCitizenships(msg.sender, CITIZEN_NFT_ID, 10000);
        issueNewCitizenships(msg.sender, FOUNDING_NFT_ID, 50);
        issueNewCitizenships(msg.sender, FIRST_NFT_ID, 1);
        contractInitialized = true;
    }

    /// @notice Change the cost for minting a new regular Citizen NFT
    /// Can only be called by the owner of the smart contract.
    function legislateCostOfEntry(uint256 _stampCost) external onlyOwner {
        citizenshipStampCostInWei = _stampCost;
        emit CitizenLegislatureChanged("stampCost", _stampCost);
    }

    /// @notice Return the current cost of minting a new regular Citizen NFT.
    function inquireCostOfEntry() external view returns (uint256) {
        return citizenshipStampCostInWei;
    }

    /// @notice Return the number of minted Citizen NFTs
    function inquireHousingNumbers() external view returns (uint256) {
        return mintedCitizensCounter;
    }

    /// @notice Return the current maximum number of  minted Founding Citizen NFTs
    function inquireAboutHistory() external view returns (uint256) {
        return mintedFoundingCitizensCounter;
    }

    /// @notice Withdraw the funds locked in the smart contract,
    /// originating from the minting of new regular Citizen NFTs.
    /// Can only becalled by the owner of the smart contract.
    function raidTheCoffers() external onlyOwner {
        uint256 amount = address(this).balance;
        (bool success, ) = owner().call{value: amount}("");
        require(success, "Anti-corruption agencies stopped the transfer");
    }

    function reserveCitizenships(uint256 _numberOfCitizenships)
        external
        onlyOwner
    {
        reservedCitizenships = _numberOfCitizenships;
    }

    function howManyReservedCitizenships() external view returns (uint256) {
        return reservedCitizenships;
    }

    fallback() external payable {
        emit LogEthDeposit(msg.sender);
    }

    receive() external payable {
        emit LogEthDeposit(msg.sender);
    }

    /// @notice Airdrop Citizen NFTs to users. The citizen NFTs must first be minted to the owner address.
    function awardCitizenship(
        address[] calldata _awardees,
        uint256[] calldata _numberOfCitizenships,
        uint256 _citizenshipType
    ) external onlyOwner {
        require(
            _awardees.length == _numberOfCitizenships.length,
            "array length not equal"
        );
        address cityDAO = this.owner();
        for (uint256 i = 0; i < _awardees.length; i++) {
            safeTransferFrom(
                cityDAO,
                _awardees[i],
                _citizenshipType,
                _numberOfCitizenships[i],
                ""
            );
        }
    }

    /// @notice returns the uri metadata. Used by marketplaces and wallets to show the NFT
    function uri(uint256 _citizenNFTId)
        public
        view
        override
        returns (string memory)
    {
        string memory json = Base64.encode(
            bytes(
                string(
                    abi.encodePacked(
                        '{ "name": "',
                        citizenNFTDescriptions[_citizenNFTId],
                        '", ',
                        '"description" : ',
                        '"A Citizen of CityDAO holds governance in the operations and activities of CityDAO.",',
                        '"image": "',
                        tokenURIs[_citizenNFTId],
                        '"'
                        "}"
                    )
                )
            )
        );
        return string(abi.encodePacked("data:application/json;base64,", json));
    }

    /// @notice Change the URI of citizen NFTs
    /// @param _tokenURIs Array of new token URIs
    /// @param _citizenNFTIds Array of citizen NFT Ids (69 OR 42 OR 7) for the respective URIs
    function changeURIs(
        string[] calldata _tokenURIs,
        uint256[] calldata _citizenNFTIds
    ) external onlyOwner {
        for (uint256 i = 0; i < _tokenURIs.length; i++) {
            tokenURIs[_citizenNFTIds[i]] = _tokenURIs[i];
        }
    }

    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    // Royalty implementation based on @abbouali
    // https://github.com/abbouali/sample_erc1155_with_eip2981
    // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    /// @dev Define the fee for the token specify
    /// @param tokenId uint256 token ID to specify
    /// @param recipient address account that receives the royalties
    function setTokenRoyalty(
        uint256 tokenId,
        address recipient,
        uint16 bps
    ) public override onlyOwner {
        _tokenRoyalties[tokenId] = TokenRoyalty(recipient, bps);
        emit TokenRoyaltySet(tokenId, recipient, bps);
    }

    /// @dev Define the default amount of fee and receive address
    /// @param recipient address ID account receive royalty
    /// @param bps uint256 amount of fee (1% == 100)
    function setDefaultRoyalty(address recipient, uint16 bps)
        public
        override
        onlyOwner
    {
        defaultRoyalty = TokenRoyalty(recipient, bps);
        emit DefaultRoyaltySet(recipient, bps);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        virtual
        override(ERC1155)
        returns (bool)
    {
        return
            interfaceId == type(IEIP2981).interfaceId ||
            interfaceId == type(IERC1155WithRoyalty).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /// @dev Returns royalty info (address to send fee, and fee to send)
    /// @param tokenId uint256 ID of the token to display information
    /// @param value uint256 sold price
    function royaltyInfo(uint256 tokenId, uint256 value)
        public
        view
        override
        returns (address, uint256)
    {
        if (_tokenRoyalties[tokenId].recipient != address(0)) {
            return (
                _tokenRoyalties[tokenId].recipient,
                (value * _tokenRoyalties[tokenId].bps) / 10000
            );
        }
        if (defaultRoyalty.recipient != address(0) && defaultRoyalty.bps != 0) {
            return (
                defaultRoyalty.recipient,
                (value * defaultRoyalty.bps) / 10000
            );
        }
        return (address(0), 0);
    }
}

Contract Security Audit

Contract ABI

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Mutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_citizenType","type":"uint256"},{"internalType":"uint256","name":"_numberOfCitizens","type":"uint256"}],"name":"issueNewCitizenships","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_stampCost","type":"uint256"}],"name":"legislateCostOfEntry","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_citizenNumber","type":"uint256"}],"name":"onlineApplicationForCitizenship","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"raidTheCoffers","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_numberOfCitizenships","type":"uint256"}],"name":"reserveCitizenships","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"royaltyInfo","outputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256[]","name":"ids","type":"uint256[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeBatchTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"id","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint16","name":"bps","type":"uint16"}],"name":"setDefaultRoyalty","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint16","name":"bps","type":"uint16"}],"name":"setTokenRoyalty","outputs":[],"stateMutability":"nonpayable","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":[{"internalType":"uint256","name":"_citizenNFTId","type":"uint256"}],"name":"uri","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"stateMutability":"payable","type":"receive"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000005a56db5f286a099b12ac78d9713e55ad42eebb400000000000000000000000000000000000000000000000000000000000003e8

-----Decoded View---------------
Arg [0] : _royaltyRecipient (address): 0x05a56db5f286a099b12ac78d9713e55ad42eebb4
Arg [1] : _royaltyBPS (uint16): 1000

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000005a56db5f286a099b12ac78d9713e55ad42eebb4
Arg [1] : 00000000000000000000000000000000000000000000000000000000000003e8


Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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