Contract 0x4cdaa2492bff9793d0f39f222def7e364e620ec1

 
 
Txn Hash Method
Block
From
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Value [Txn Fee]
0xeaa4e7c9ca9b4627a7de4cb0dd207a229820c7babfed25ddb6aa184189d278feLaunch Collectio...242159002022-01-27 6:39:454 hrs 39 mins ago0xa879430ee5ae6955844b454852229bc1762a4d8e IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.06928700195 31.049700021
0x5cea3a714f3bd90da6477fbbc1a774cd4f3908d041f41e4f85d5311cdde7b3f0Launch Collectio...242156342022-01-27 6:30:374 hrs 49 mins ago0x0cbfc5242cf36ca11b816f58d3110b24bd203b83 IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.071534513222 32.054913024
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0x28ae7ba2b72f90247b3260e43a2712224111d0889ab0d123b9412d7a127ef559Launch Collectio...241872372022-01-26 13:24:0721 hrs 55 mins ago0xde49165e2c4ceb72757221aa99efd1a1730d38d3 IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.064938716129 29.100000013
0x2940e86833924bfb73b315a91539b30c990c528db1e1af98b272b054960ef7a1Launch Collectio...241827392022-01-26 10:34:251 day 45 mins ago0x8e62ab4673dd4c133bec0c92558e90bc77fc89cb IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.114413042324 51.271280791
0x3bea3755c91ce69dda7cb4c11748b321e5889eb223a88c5375309dd216cb8767Launch Collectio...241745332022-01-26 5:37:191 day 5 hrs ago0x0725cf86d60e18993f6c4221c3a449968118f2ba IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.124768767018 55.911332819
0x5a9e2087fb4216b3eb34b55877495e0d1e8f43664f70c352cb29a493995699ddLaunch Collectio...241721132022-01-26 4:11:541 day 7 hrs ago0xd30a79e487351eb0064c8a78eb341da364d78a9a IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.160253342801 71.81018971
0x7a02c68c0f04924727bbfc0d64e5bd22b19cd9db9407a77c859b817e4a85cb83Launch Collectio...241626342022-01-25 22:35:081 day 12 hrs agoDefenders of the Land of Dreams: Deployer IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.076046612004 34.076253553
0xee959c1ec7e5b9756dd8fe6a4d57ed7478b007b2cd02003bb05cea55c8f0b610Launch Collectio...241484272022-01-25 14:19:161 day 21 hrs ago0xb57f8949fc7f1cb088d66c1f09f3e9702344741b IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.361340969346 161.923978902
0xd39d8d3077b6e18fa36ba1b7344fb2907852d75a54f74865c075f19160aafb63Launch Collectio...241438462022-01-25 11:33:141 day 23 hrs ago0x1b69bdcb4c6020fdf96c6617ab362d043214bb0a IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.173677701512 77.822352944
0xaf69c56d5f5d3bf32adcca3bea40248b4a083bd2364e9b8139d614937dc1c919Launch Collectio...241426332022-01-25 10:51:262 days 28 mins ago0xb1df5e6f8269fdf5f127d022f77c2af55ab6e252 IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.067739006335 30.354293818
0xc9f6317f509b49890e94aee59bbff7064894b4e3eb172aa6e2a651fc35e49fe3Launch Collectio...241425772022-01-25 10:49:302 days 30 mins ago0xb0eef6392da5b4a31310f1237092f8950d34df8b IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.067600596833 30.293153957
0x5f708134c4a762995dafb03d38cc81d4b434e607c1c6f2ce228f7b483cc72864Launch Collectio...241305542022-01-25 3:27:352 days 7 hrs ago0x3c9a552e3121df5130e616a3d74a2277437bba4e IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.07732198944 34.648491512
0xc69eb161ba70377e0ace778674cf57f5bac45767ac7c7ef073f00defcadd4080Launch Collectio...241301882022-01-25 3:15:032 days 8 hrs ago0x3c9a552e3121df5130e616a3d74a2277437bba4e IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.001004912716 40.383889897
0xe351ada7829c1e19d15cb51af4ef1f7f51179c9042af5deb81a0408cd8f3519bLaunch Collectio...241298152022-01-25 3:02:132 days 8 hrs ago0x3c9a552e3121df5130e616a3d74a2277437bba4e IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.069821694812 31.286214331
0xb58e56432caabbc9d7c10f6b5e152c9cecce7093b8da615ae081650d5dc2ced9Launch Collectio...241292582022-01-25 2:42:562 days 8 hrs ago0x3c9a552e3121df5130e616a3d74a2277437bba4e IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.075741807268 33.938941505
0xa50981833749261b05b68c85af52bdc808fcc6eac650d837de8628017b5e67d7Launch Collectio...241291822022-01-25 2:40:202 days 8 hrs ago0x3c9a552e3121df5130e616a3d74a2277437bba4e IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.071237782544 31.920745252
0x7a16e2ee6a7092193e179cb7bba2cf597eb94060e29b6bcd3559b60b7583acc2Launch Collectio...240737762022-01-23 17:53:213 days 17 hrs ago0x1b69bdcb4c6020fdf96c6617ab362d043214bb0a IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.106086261725 47.536672829
0xb5098e49cd3299d0bf38a31735dbb5b8c4e6203846f69b28f2252a4a2b2443ccLaunch Collectio...240736332022-01-23 17:48:273 days 17 hrs ago0x1b69bdcb4c6020fdf96c6617ab362d043214bb0a IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.002181544669 87.79558393
0x33c6d932393d26911d2a1e380dea462850e815a74f559f0adf60d29e9582b040Launch Collectio...240735912022-01-23 17:46:593 days 17 hrs ago0x1b69bdcb4c6020fdf96c6617ab362d043214bb0a IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.251112862018 112.522298088
0x837259e1b10fe5120dadfb2c5301df32827205edba8c173509ce47c26b756fc5Launch Collectio...240609812022-01-23 9:34:554 days 1 hr ago0xe5880230dc1edd1dc0744aa045d92f19910cc915 IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.135760125656 60.837103454
0x9c61929df017b35b855adf2de653d2f58df23165734bd2a294860cc1aede2bdfLaunch Collectio...240205122022-01-22 9:24:185 days 1 hr ago0x8f021e3eab44016d8b435ea90ed30d0b31373422 IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.265402391225 118.918324022
0x5056be412736b66e5d2323f19e7396df039fa7baaa498ea96c2a5d6412966a9dLaunch Collectio...240084672022-01-22 2:08:175 days 9 hrs ago0x097fff84b35dd223054e0db45b2e50185d20b809 IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.182002881715 81.55449444
0xccb666f81833f11cdd46efe503190fc0996c13aef522c8a4665f0e40205bf9b0Launch Collectio...239956392022-01-21 18:20:575 days 16 hrs agoFoundnone Artifacts: Deployer IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.616133741952 276.093578074
0x815b89dfbc97efb1d9e7dcee5e1b68bb9c90f5398d86493cb5a1787279862304Launch Collectio...239764512022-01-21 6:27:106 days 4 hrs ago0x52303ed2d5d2e14a660fbff822571f12e6438d2f IN  0x4cdaa2492bff9793d0f39f222def7e364e620ec10 MATIC0.181465724985 81.316420947
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0xeaa4e7c9ca9b4627a7de4cb0dd207a229820c7babfed25ddb6aa184189d278fe242159002022-01-27 6:39:454 hrs 39 mins ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x5cea3a714f3bd90da6477fbbc1a774cd4f3908d041f41e4f85d5311cdde7b3f0242156342022-01-27 6:30:374 hrs 49 mins ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xcb257f6baf112e4a4fe3ca4aa32359b0574ccbf91874d06d17d2b186c554b60a242043722022-01-26 23:58:4911 hrs 20 mins ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x28ae7ba2b72f90247b3260e43a2712224111d0889ab0d123b9412d7a127ef559241872372022-01-26 13:24:0721 hrs 55 mins ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x2940e86833924bfb73b315a91539b30c990c528db1e1af98b272b054960ef7a1241827392022-01-26 10:34:251 day 45 mins ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x3bea3755c91ce69dda7cb4c11748b321e5889eb223a88c5375309dd216cb8767241745332022-01-26 5:37:191 day 5 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x5a9e2087fb4216b3eb34b55877495e0d1e8f43664f70c352cb29a493995699dd241721132022-01-26 4:11:541 day 7 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x7a02c68c0f04924727bbfc0d64e5bd22b19cd9db9407a77c859b817e4a85cb83241626342022-01-25 22:35:081 day 12 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xee959c1ec7e5b9756dd8fe6a4d57ed7478b007b2cd02003bb05cea55c8f0b610241484272022-01-25 14:19:161 day 21 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xd39d8d3077b6e18fa36ba1b7344fb2907852d75a54f74865c075f19160aafb63241438462022-01-25 11:33:141 day 23 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xaf69c56d5f5d3bf32adcca3bea40248b4a083bd2364e9b8139d614937dc1c919241426332022-01-25 10:51:262 days 28 mins ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xc9f6317f509b49890e94aee59bbff7064894b4e3eb172aa6e2a651fc35e49fe3241425772022-01-25 10:49:302 days 30 mins ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x5f708134c4a762995dafb03d38cc81d4b434e607c1c6f2ce228f7b483cc72864241305542022-01-25 3:27:352 days 7 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xe351ada7829c1e19d15cb51af4ef1f7f51179c9042af5deb81a0408cd8f3519b241298152022-01-25 3:02:132 days 8 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xb58e56432caabbc9d7c10f6b5e152c9cecce7093b8da615ae081650d5dc2ced9241292582022-01-25 2:42:562 days 8 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xa50981833749261b05b68c85af52bdc808fcc6eac650d837de8628017b5e67d7241291822022-01-25 2:40:202 days 8 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x7a16e2ee6a7092193e179cb7bba2cf597eb94060e29b6bcd3559b60b7583acc2240737762022-01-23 17:53:213 days 17 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x33c6d932393d26911d2a1e380dea462850e815a74f559f0adf60d29e9582b040240735912022-01-23 17:46:593 days 17 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x837259e1b10fe5120dadfb2c5301df32827205edba8c173509ce47c26b756fc5240609812022-01-23 9:34:554 days 1 hr ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x9c61929df017b35b855adf2de653d2f58df23165734bd2a294860cc1aede2bdf240205122022-01-22 9:24:185 days 1 hr ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x5056be412736b66e5d2323f19e7396df039fa7baaa498ea96c2a5d6412966a9d240084672022-01-22 2:08:175 days 9 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xccb666f81833f11cdd46efe503190fc0996c13aef522c8a4665f0e40205bf9b0239956392022-01-21 18:20:575 days 16 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x815b89dfbc97efb1d9e7dcee5e1b68bb9c90f5398d86493cb5a1787279862304239764512022-01-21 6:27:106 days 4 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0x68113dcd0572f2170d38de93761a0fc2f517ccc1c061057dc337cba89f935092239764472022-01-21 6:26:586 days 4 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
0xd7afbe3de3d36961c5ea65d329459d816100aaedc43ee567cedaab799eba5e2e239764472022-01-21 6:26:586 days 4 hrs ago 0x4cdaa2492bff9793d0f39f222def7e364e620ec1  Contract Creation0 MATIC
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Contract Source Code Verified (Exact Match)

Contract Name:
collectionFactoryV2

Compiler Version
v0.8.0+commit.c7dfd78e

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at polygonscan.com on 2021-07-24
*/

pragma solidity ^0.8.0;


/**
 *Submitted for verification at polygonscan.com on 2021-06-10
*/
// File: @openzeppelin/contracts/introspection/IERC165.sol
/**
 * @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: @openzeppelin/contracts/token/ERC1155/IERC1155.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;
}

/**
 * @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);
}

/**
 * @title Counters
 * @author Matt Condon (@shrugs)
 * @dev Provides counters that can only be incremented or decremented by one. This can be used e.g. to track the number
 * of elements in a mapping, issuing ERC721 ids, or counting request ids.
 *
 * Include with `using Counters for Counters.Counter;`
 */
library Counters {
    struct Counter {
        // This variable should never be directly accessed by users of the library: interactions must be restricted to
        // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add
        // this feature: see https://github.com/ethereum/solidity/issues/4637
        uint256 _value; // default: 0
    }

    function current(Counter storage counter) internal view returns (uint256) {
        return counter._value;
    }

    function increment(Counter storage counter) internal {

        counter._value += 1;
        
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");

        counter._value = value - 1;
        
    }
}

/**
 * _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);
}

/*
 * @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 GSN 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 payable) {
        return payable(msg.sender);
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

    /**
     * @dev Registers the contract as an implementer of the interface defined by
     * `interfaceId`. Support of the actual ERC165 interface is automatic and
     * registering its interface id is not required.
     *
     * See {IERC165-supportsInterface}.
     *
     * Requirements:
     *
     * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`).
     */
    function _registerInterface(bytes4 interfaceId) internal virtual {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// File: @openzeppelin/contracts/math/SafeMath.sol
/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
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) {
        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) {
        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) {
        // 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) {
        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) {
        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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @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) {
        require(b <= a, "SafeMath: subtraction overflow");
        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) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @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. 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) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        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) {
        require(b > 0, "SafeMath: modulo by zero");
        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) {
        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.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * 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) {
        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) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol
/**
 * @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;
        // solhint-disable-next-line no-inline-assembly
        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");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

// File: @openzeppelin/contracts/token/ERC1155/ERC1155.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 SafeMath for uint256;
    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;

    /*
     *     bytes4(keccak256('balanceOf(address,uint256)')) == 0x00fdd58e
     *     bytes4(keccak256('balanceOfBatch(address[],uint256[])')) == 0x4e1273f4
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,uint256,bytes)')) == 0xf242432a
     *     bytes4(keccak256('safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)')) == 0x2eb2c2d6
     *
     *     => 0x00fdd58e ^ 0x4e1273f4 ^ 0xa22cb465 ^
     *        0xe985e9c5 ^ 0xf242432a ^ 0x2eb2c2d6 == 0xd9b67a26
     */
    bytes4 private constant _INTERFACE_ID_ERC1155 = 0xd9b67a26;

    /*
     *     bytes4(keccak256('uri(uint256)')) == 0x0e89341c
     */
    bytes4 private constant _INTERFACE_ID_ERC1155_METADATA_URI = 0x0e89341c;

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

        // register the supported interfaces to conform to ERC1155 via ERC165
        _registerInterface(_INTERFACE_ID_ERC1155);

        // register the supported interfaces to conform to ERC1155MetadataURI via ERC165
        _registerInterface(_INTERFACE_ID_ERC1155_METADATA_URI);
    }

    /**
     * @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) external 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 {
        require(_msgSender() != operator, "ERC1155: setting approval status for self");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_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(to != address(0), "ERC1155: transfer to the zero address");
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: caller is not owner nor approved"
        );

        address operator = _msgSender();

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

        _balances[id][from] = _balances[id][from].sub(amount, "ERC1155: insufficient balance for transfer");
        _balances[id][to] = _balances[id][to].add(amount);

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

        _doSafeTransferAcceptanceCheck(operator, 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(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");
        require(to != address(0), "ERC1155: transfer to the zero address");
        require(
            from == _msgSender() || isApprovedForAll(from, _msgSender()),
            "ERC1155: transfer caller is not owner nor approved"
        );

        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];

            _balances[id][from] = _balances[id][from].sub(
                amount,
                "ERC1155: insufficient balance for transfer"
            );
            _balances[id][to] = _balances[id][to].add(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 `account`.
     *
     * Emits a {TransferSingle} event.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - If `account` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the
     * acceptance magic value.
     */
    function _mint(address account, uint256 id, uint256 amount, bytes memory data) internal virtual {
        require(account != address(0), "ERC1155: mint to the zero address");

        address operator = _msgSender();

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

        _balances[id][account] = _balances[id][account].add(amount);
        emit TransferSingle(operator, address(0), account, id, amount);

        _doSafeTransferAcceptanceCheck(operator, address(0), account, 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 (uint i = 0; i < ids.length; i++) {
            _balances[ids[i]][to] = amounts[i].add(_balances[ids[i]][to]);
        }

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

        address operator = _msgSender();

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

        _balances[id][account] = _balances[id][account].sub(
            amount,
            "ERC1155: burn amount exceeds balance"
        );

        emit TransferSingle(operator, account, 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 account, uint256[] memory ids, uint256[] memory amounts) internal virtual {
        require(account != address(0), "ERC1155: burn from the zero address");
        require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch");

        address operator = _msgSender();

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

        for (uint i = 0; i < ids.length; i++) {
            _balances[ids[i]][account] = _balances[ids[i]][account].sub(
                amounts[i],
                "ERC1155: burn amount exceeds balance"
            );
        }

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

    /**
     * @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(to).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(to).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;
    }
}

/**
 * @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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), 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 {
        emit OwnershipTransferred(_owner, address(0));
        _owner = 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");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

/**
 * https://github.com/maticnetwork/pos-portal/blob/master/contracts/common/ContextMixin.sol
 */
abstract contract ContextMixin {
    function msgSender()
        internal
        view
        returns (address payable sender)
    {
        if (msg.sender == address(this)) {
            bytes memory array = msg.data;
            uint256 index = msg.data.length;
            assembly {
                // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those.
                sender := and(
                    mload(add(array, index)),
                    0xffffffffffffffffffffffffffffffffffffffff
                )
            }
        } else {
            sender = payable(msg.sender);
        }
        return sender;
    }
}

/**
 * https://github.com/maticnetwork/pos-portal/blob/master/contracts/common/Initializable.sol
 */
contract Initializable {
    bool inited = false;

    modifier initializer() {
        require(!inited, "already inited");
        _;
        inited = true;
    }
}

/**
 * https://github.com/maticnetwork/pos-portal/blob/master/contracts/common/EIP712Base.sol
 */
contract EIP712Base is Initializable {
    struct EIP712Domain {
        string name;
        string version;
        address verifyingContract;
        bytes32 salt;
    }

    string constant public ERC712_VERSION = "1";

    bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256(
        bytes(
            "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)"
        )
    );
    bytes32 internal domainSeperator;

    // supposed to be called once while initializing.
    // one of the contractsa that inherits this contract follows proxy pattern
    // so it is not possible to do this in a constructor
    function _initializeEIP712(
        string memory name
    )
        internal
        initializer
    {
        _setDomainSeperator(name);
    }

    function _setDomainSeperator(string memory name) internal {
        domainSeperator = keccak256(
            abi.encode(
                EIP712_DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                keccak256(bytes(ERC712_VERSION)),
                address(this),
                bytes32(getChainId())
            )
        );
    }

    function getDomainSeperator() public view returns (bytes32) {
        return domainSeperator;
    }

    function getChainId() public view returns (uint256) {
        uint256 id;
        assembly {
            id := chainid()
        }
        return id;
    }

    /**
     * Accept message hash and returns hash message in EIP712 compatible form
     * So that it can be used to recover signer from signature signed using EIP712 formatted data
     * https://eips.ethereum.org/EIPS/eip-712
     * "\\x19" makes the encoding deterministic
     * "\\x01" is the version byte to make it compatible to EIP-191
     */
    function toTypedMessageHash(bytes32 messageHash)
        internal
        view
        returns (bytes32)
    {
        return
            keccak256(
                abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash)
            );
    }
}

/**
 * https://github.com/maticnetwork/pos-portal/blob/master/contracts/common/NativeMetaTransaction.sol
 */
contract NativeMetaTransaction is EIP712Base {
    using SafeMath for uint256;
    bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256(
        bytes(
            "MetaTransaction(uint256 nonce,address from,bytes functionSignature)"
        )
    );
    event MetaTransactionExecuted(
        address userAddress,
        address payable relayerAddress,
        bytes functionSignature
    );
    mapping(address => uint256) nonces;

    /*
     * Meta transaction structure.
     * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas
     * He should call the desired function directly in that case.
     */
    struct MetaTransaction {
        uint256 nonce;
        address from;
        bytes functionSignature;
    }

    function executeMetaTransaction(
        address userAddress,
        bytes memory functionSignature,
        bytes32 sigR,
        bytes32 sigS,
        uint8 sigV
    ) public payable returns (bytes memory) {
        MetaTransaction memory metaTx = MetaTransaction({
            nonce: nonces[userAddress],
            from: userAddress,
            functionSignature: functionSignature
        });

        require(
            verify(userAddress, metaTx, sigR, sigS, sigV),
            "Signer and signature do not match"
        );

        // increase nonce for user (to avoid re-use)
        nonces[userAddress] = nonces[userAddress].add(1);

        emit MetaTransactionExecuted(
            userAddress,
            payable(msg.sender),
            functionSignature
        );

        // Append userAddress and relayer address at the end to extract it from calling context
        (bool success, bytes memory returnData) = address(this).call(
            abi.encodePacked(functionSignature, userAddress)
        );
        require(success, "Function call not successful");

        return returnData;
    }

    function hashMetaTransaction(MetaTransaction memory metaTx)
        internal
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    META_TRANSACTION_TYPEHASH,
                    metaTx.nonce,
                    metaTx.from,
                    keccak256(metaTx.functionSignature)
                )
            );
    }

    function getNonce(address user) public view returns (uint256 nonce) {
        nonce = nonces[user];
    }

    function verify(
        address signer,
        MetaTransaction memory metaTx,
        bytes32 sigR,
        bytes32 sigS,
        uint8 sigV
    ) internal view returns (bool) {
        require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER");
        return
            signer ==
            ecrecover(
                toTypedMessageHash(hashMetaTransaction(metaTx)),
                sigV,
                sigR,
                sigS
            );
    }
}

contract cvCollectibles is ERC1155, ContextMixin, NativeMetaTransaction, Ownable {
    address internal creator;
    using Counters for Counters.Counter;
    Counters.Counter private _tokenIds;
  // Token name
    string private _name;
    constructor (string memory uri_, string memory name_) public ERC1155(uri_) {
        _name = name_;
        _setURI(uri_);
        _initializeEIP712(name_);
        creator = msg.sender;
        
    }
    
    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual returns (string memory) {
        return _name;
    }
    
    function takeOwnership() external {
        require(msg.sender == creator);
        transferOwnership(creator);
    }

    function setURI(string memory uri_) public onlyOwner {
        _setURI(uri_);
    }

  /**
    * @dev Mints some amount of tokens to an address
    * @param _to          Address of the future owner of the token
    * @param _quantity    Amount of tokens to mint
    * @param _data        Data to pass if receiver is contract
    */
  function mint(
    address _to,
    uint256 _quantity,
    bytes memory _data
  ) public onlyOwner {
      _tokenIds.increment();
      uint256 newItemId = _tokenIds.current();
    _mint(_to, newItemId, _quantity, _data);
  }

  /**
     * This is used instead of msg.sender as transactions won't be sent by the original token owner, but by OpenSea.
     */
    function _msgSender()
        internal
        override
        view
        returns (address payable sender)
    {
        return ContextMixin.msgSender();
    }

    /**
    * As another option for supporting trading without requiring meta transactions, override isApprovedForAll to whitelist OpenSea proxy accounts on Matic
    */
    function isApprovedForAll(
        address _owner,
        address _operator
    ) public override view returns (bool isOperator) {
        if (_operator == address(0x207Fa8Df3a17D96Ca7EA4f2893fcdCb78a304101)) {
            return true;
        }
        
        return ERC1155.isApprovedForAll(_owner, _operator);
    }
}

//SPDX-License-Identifier: MIT
/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @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] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

abstract contract FactoryInterface {
    string private _contractname;
    address[] public collectionsList;
    // Collection address to index in collecitonList
    mapping(address => uint256) internal collectionToIndex;
    // Collection address to boolean
    mapping(address => uint256) collectionToId;
    // Collection address to boolean
    mapping(uint256 => address) idToCollection;
    
    function name() public view virtual returns (string memory);
    function launchCollection(uint256 collection_id,string memory _name) public virtual returns (address collection);
    function addCollection(address _collection, uint256 collection_id) public virtual;
    function getCollectionsCount() public virtual view returns (uint collectionscount);
    function getIdFromCollection(address _collection) public virtual view returns (uint256 id);
    function getCollectionFromId(uint256 _id) public virtual view returns (address collection);

    event NewCollectionCreated(address indexed collection,address indexed owner, uint256 indexed collection_id);
}

contract collectionFactoryV2 is FactoryInterface, Ownable {
    using Strings for uint256;
    string private _contractname;
    string private _uri;
    constructor(){
      _contractname = "[Cryptovoxels] Collection Factory V2";
      _uri = 'https://www.cryptovoxels.com/c/';
    }

    function name() public view override returns(string memory){
      return _contractname;
    }

    function launchCollection(uint256 collection_id,string memory _name) public override returns (address collection) {
        require(idToCollection[collection_id] == address(0),'Collection already exists');
        string memory uri = collectionURI(collection_id);
        cvCollectibles newCollection = new cvCollectibles(uri,_name);
        address _collection = address(newCollection);
        require(_collection != address(0),'Zero address not allowed');
        require(_collection != address(this));

        // set collection to Id
        collectionToId[_collection] = collection_id;
        // set Id to collection
        idToCollection[collection_id] = _collection;
        // set collection to index in collectionsList
        collectionToIndex[_collection] = collectionsList.length;
        // Push into the collectionsList
        collectionsList.push(_collection);
        
        NewCollectionCreated(_collection,msg.sender,collection_id);

        // transfer ownership
        newCollection.transferOwnership(msg.sender);
        return _collection;
    }

    function addCollection(address _collection, uint256 collection_id) public override onlyOwner {
        require(_collection != address(0),'Zero address is not allowed');
        require(idToCollection[collection_id] == address(0),'Collection already exists');
        require(_collection != address(this));
        address o = cvCollectibles(_collection).owner();
        // add to COllection to Id
        collectionToId[_collection] = collection_id;
        // add to Id to collection
        idToCollection[collection_id] = _collection;
        // add collection to index
        collectionToIndex[_collection] = collectionsList.length;
        // add to collection list
        collectionsList.push(_collection);
        NewCollectionCreated(_collection,o,collection_id);
    }

    function getCollectionsCount() public override view returns (uint256 collectionscount) {
        return collectionsList.length;
    }

    function getIdFromCollection(address _collection) public override view returns (uint256 id) {
        return collectionToId[_collection];
    }
    function getCollectionFromId(uint256 _id) public override view returns (address collection) {
    return idToCollection[_id];
    }

        /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function collectionURI(uint256 collection_id)
        internal
        view
        returns (string memory)
    {
        string memory baseURI = _baseURI();
        return
            bytes(baseURI).length > 0
                ? string(abi.encodePacked(baseURI, collection_id.toString(),'/{id}'))
                : "";
    }

    function _baseURI() internal view returns (string memory) {
        return _uri;
    }

    function setBaseURI(string calldata newURI) public onlyOwner {
        _uri = newURI;
    }

    function migrateOldFactory(address oldcontract,uint256 quantity) external onlyOwner {
        require(oldcontract != address(0),'Zero address is not allowed');
        uint256 currentCollectionsCount;
        currentCollectionsCount = getCollectionsCount();
        FactoryInterface factory = FactoryInterface(oldcontract);
        uint256 previousCollectionsCount;
        previousCollectionsCount = factory.getCollectionsCount();
        for (uint256 i = currentCollectionsCount; i <(currentCollectionsCount+quantity); i++) {
            if(i>previousCollectionsCount){
                break;
            }
            uint256 collection_id;
            address collection;
            collection = factory.collectionsList(i);
            collection_id = factory.getIdFromCollection(collection);

            addCollection(collection, collection_id);
        }
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"collection","type":"address"},{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"uint256","name":"collection_id","type":"uint256"}],"name":"NewCollectionCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"address","name":"_collection","type":"address"},{"internalType":"uint256","name":"collection_id","type":"uint256"}],"name":"addCollection","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"collectionsList","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_id","type":"uint256"}],"name":"getCollectionFromId","outputs":[{"internalType":"address","name":"collection","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getCollectionsCount","outputs":[{"internalType":"uint256","name":"collectionscount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_collection","type":"address"}],"name":"getIdFromCollection","outputs":[{"internalType":"uint256","name":"id","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"collection_id","type":"uint256"},{"internalType":"string","name":"_name","type":"string"}],"name":"launchCollection","outputs":[{"internalType":"address","name":"collection","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"oldcontract","type":"address"},{"internalType":"uint256","name":"quantity","type":"uint256"}],"name":"migrateOldFactory","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","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":"string","name":"newURI","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://d611f944d0277607083f21aa890902647f68d706982b97cf468eb8ac00f9eaa1
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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