Contract 0xbf53C33235CbFc22CeF5a61A83484B86342679C5 1

 

Contract Overview

Decentraland: DCLDGSMMR2020 Token
Balance:
0 Ether

EtherValue:
$0.00

Token:
 
Txn Hash
Method
Block
From
To
Value
0x95c0de4b7d44b1fe5c1fcb180f96cb06540fd26d092cdb2c7c9f49d64eda1a90Set Approval For...156079832022-09-25 4:25:232 days 15 hrs agoENS Name firstechelon.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.0003214 6.97573859
0xa8ee6ff47065f8c8a886cf990f01e3ed4ede5f93329739fcd975b9e87cba4470Set Approval For...155763922022-09-20 18:11:597 days 1 hr ago0x6b3a3a00b7a2fc65b04244063e0255974eb237d7 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00075036 16.28564874
0x63d327c7b885d8e35f568ecbbfeffe96b1d9a695f401cc23de34623240b11bfeSafe Transfer Fr...155763772022-09-20 18:08:597 days 1 hr ago0x6c4a6ac41c52e7ba6985865aa3ee7b4a3d494d9e IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00180919 16.93827894
0xc02590c7c64299756f87be9e02cdedd7ebb9cc5335b0969e9b1a70b7a71ae6f4Set Approval For...155510962022-09-17 5:02:2310 days 15 hrs ago0x12a1f48573eb4716e5b82410e29f9cd8381d555a IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.0002026 4.39719194
0x030e142d712f1c69ffa5e77cdc8cd3a16e110227ecfbe909f57dc13fc37cc541Set Approval For...154373052022-08-30 0:33:3928 days 19 hrs ago0x347d159440b02fa25d948dcb7afeb58ecc06db05 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00131895 28.62620705
0xd6203ada31d5781eec0154333bb9dc5b3e4abad6730c33c2295f43e99f38b34cSet Approval For...154045552022-08-24 18:49:4834 days 1 hr ago0x103cd6712ca17107b8fd63dd15b5c95dc1572ecd IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00105213 22.83519776
0xa359897a9631bc10388ae06bac336b99fd435b34a0697a2299bc0c01c0a92958Safe Transfer Fr...153921852022-08-22 19:48:3636 days 20 mins agoENS Name x100.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00202734 21.91182388
0x367392984b231ce6e7522b5fb9bf088fee4c9be146ac29174d363c35c1dcdf99Safe Transfer Fr...153921782022-08-22 19:45:3636 days 23 mins agoENS Name x100.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00169865 19.97879823
0xabbc4ac867f26b0007ff06c84ab33c5b3dd2e8a352ecb2f3ca7ee94a102ef082Safe Transfer Fr...153921652022-08-22 19:42:0636 days 26 mins agoENS Name x100.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.0021915 23.59447859
0x8bf62ce562955b1e8681ca7392b1b1f80a8b99638abec848fff2b416bb282102Transfer From153407872022-08-14 16:16:3244 days 3 hrs agoENS Name kingtrippy.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00332836 32.02476335
0x2c8803662d47a14e6edcffb89d8d62219d5fe107632bddce6b7a7571c46b70e7Set Approval For...153072772022-08-09 9:43:1449 days 10 hrs agoENS Name nwiz.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00068371 14.83912867
0x04f272a11e41d88b703686e59768a9e28e9070db6b55d8ddafce0c743d13a498Set Approval For...152781132022-08-04 20:54:3653 days 23 hrs agoENS Name fk-you.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00083485 18.11954518
0x0bd3ac78b5b96a149b105edd42180fefeb4e96d9ab9b54629c7f5a8b77f7c933Set Approval For...151987382022-07-23 11:47:4766 days 8 hrs ago0xd42e4a530f43e23be631cf3853d09e0977289389 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00028105 6.1
0x194f140337844f5aa259e185b8d0c6f6be97ed4c763fd0603ebea9519690ae81Set Approval For...151950242022-07-22 21:58:4666 days 22 hrs agoENS Name x100.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00049545 10.7532504
0xf4163fed24a50ce9aced470ef08412201553a900c7cb24c15622639f1cdfbfc4Set Approval For...150991122022-07-08 1:59:4381 days 18 hrs agoENS Name *جدة.eth IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00048362 19.94564081
0xb9d1c83053a4091f1f77c791c30f820a841cef38a3dcdc78b9ef52d37904316cSet Approval For...150459072022-06-29 16:38:5490 days 3 hrs ago0x24d1e52e43ba0a98bdc7eda0fe0dcd96dd0f7821 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00215992 46.87836715
0xdf5f597d129b4ada23540c23e3dcc3c06620c4bfb69944dd72cb87ab0326809bTransfer From150408282022-06-28 17:40:5691 days 2 hrs ago0x73016bd76dcb2ce9879647c4c77b96f0658be524 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00452013 50.43728281
0x2abcad70b1ce6e91b54b2e6f0be75c3a4ba5127e46bb3965dfb37e696c094f42Transfer From150407372022-06-28 17:14:3791 days 2 hrs ago0x73016bd76dcb2ce9879647c4c77b96f0658be524 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00554323 52.74748039
0x07edf4a099977bf1a6f71f3bcf73c396e6b6936d76ae5e4bde55926cb48e5b6aTransfer From150407242022-06-28 17:12:1691 days 2 hrs ago0x73016bd76dcb2ce9879647c4c77b96f0658be524 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00714902 59.87960143
0xba72d76833c97de1013c858b10d37c73573e557c751a311a89be7031816f7952Set Approval For...150289402022-06-26 12:20:1093 days 7 hrs ago0xb55e232826428847e61cd750e5bf5993573ef74a IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.0020715 44.95947249
0x2abab30c0fc7c0c9643a7883f9ea2bb80c9f4adf2144d2c6d597af22f5d77c9cSet Approval For...149892922022-06-19 6:15:27100 days 13 hrs ago0x9dadecce3c98fe049dc3bb8680864195586eee89 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00069597 15.10536508
0x98dcd168c234c612356ecb46d5e5500cace8d1f9a74dab2b7914feb4b616a62cSet Approval For...149705062022-06-16 0:51:56103 days 19 hrs ago0x8b257b97c0e07e527b073b6513ba8ea659279b61 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.0016501 35.81349968
0x29d937078f59ddbab6133a63d326d67fbea779191ce3c438a07a080f385ed800Set Approval For...149048642022-06-04 19:16:04115 days 52 mins ago0x24d1e52e43ba0a98bdc7eda0fe0dcd96dd0f7821 IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00117664 48.52737047
0x48ecf17dda635c3012c1b2cf050596d5e213c78eb8504128c5af12faccad9836Set Approval For...148394472022-05-25 3:06:55125 days 17 hrs ago0x2973612d58e4c0e30a3587fcfe7e1b4e3436432d IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00101317 21.94958647
0x9fee5667952cafbd4fd5b634a9ef2484dd479b8f8653f8704efc1a662ce9880cSet Approval For...148394332022-05-25 3:03:37125 days 17 hrs ago0x2973612d58e4c0e30a3587fcfe7e1b4e3436432d IN  Decentraland: DCLDGSMMR2020 Token0 Ether0.00080497 17.4390744
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OVERVIEW

Decentraland is an Ethereum blockchain-powered virtual world, developed and owned by its users, who can create, experience, and monetize content and applications. Wearables are worn in game by avatars, and collecting and trading these unique NFTs is a great way for users to integrate themselves i...

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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x6a99abebb48819d2abe92c5e4dc4f48dc09a3ee8

Contract Name:
ERC721Collection

Compiler Version
v0.5.11+commit.c082d0b4

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-07-02
*/

// File: @openzeppelin/contracts/ownership/Ownable.sol

pragma solidity ^0.5.0;

/**
 * @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.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be aplied to your functions to restrict their use to
 * the owner.
 */
contract Ownable {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

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

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

    /**
     * @dev Returns true if the caller is the current owner.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _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 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 onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/introspection/IERC165.sol

pragma solidity ^0.5.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * [EIP](https://eips.ethereum.org/EIPS/eip-165).
 *
 * 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
     * [EIP section](https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified)
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// File: @openzeppelin/contracts/token/ERC721/IERC721.sol

pragma solidity ^0.5.0;


/**
 * @dev Required interface of an ERC721 compliant contract.
 */
contract IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

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

    /**
     * @dev Returns the owner of the NFT specified by `tokenId`.
     */
    function ownerOf(uint256 tokenId) public view returns (address owner);

    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * 
     *
     * Requirements:
     * - `from`, `to` cannot be zero.
     * - `tokenId` must be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this
     * NFT by either `approve` or `setApproveForAll`.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public;
    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * Requirements:
     * - If the caller is not `from`, it must be approved to move this NFT by
     * either `approve` or `setApproveForAll`.
     */
    function transferFrom(address from, address to, uint256 tokenId) public;
    function approve(address to, uint256 tokenId) public;
    function getApproved(uint256 tokenId) public view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) public;
    function isApprovedForAll(address owner, address operator) public view returns (bool);


    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory data) public;
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Receiver.sol

pragma solidity ^0.5.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
contract IERC721Receiver {
    /**
     * @notice Handle the receipt of an NFT
     * @dev The ERC721 smart contract calls this function on the recipient
     * after a `safeTransfer`. This function MUST return the function selector,
     * otherwise the caller will revert the transaction. The selector to be
     * returned can be obtained as `this.onERC721Received.selector`. This
     * function MAY throw to revert and reject the transfer.
     * Note: the ERC721 contract address is always the message sender.
     * @param operator The address which called `safeTransferFrom` function
     * @param from The address which previously owned the token
     * @param tokenId The NFT identifier which is being transferred
     * @param data Additional data with no specified format
     * @return bytes4 `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes memory data)
    public returns (bytes4);
}

// File: @openzeppelin/contracts/math/SafeMath.sol

pragma solidity ^0.5.0;

/**
 * @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, 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");
        uint256 c = a - b;

        return c;
    }

    /**
     * @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) {
        // 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 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts 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) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts 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;
    }
}

// File: @openzeppelin/contracts/utils/Address.sol

pragma solidity ^0.5.0;

/**
 * @dev Collection of functions related to the address type,
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * This test is non-exhaustive, and there may be false-negatives: during the
     * execution of a contract's constructor, its address will be reported as
     * not containing a contract.
     *
     * > It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies in 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;
    }
}

// File: @openzeppelin/contracts/drafts/Counters.sol

pragma solidity ^0.5.0;


/**
 * @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;`
 * Since it is not possible to overflow a 256 bit integer with increments of one, `increment` can skip the SafeMath
 * overflow check, thereby saving gas. This does assume however correct usage, in that the underlying `_value` is never
 * directly accessed.
 */
library Counters {
    using SafeMath for uint256;

    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 {
        counter._value = counter._value.sub(1);
    }
}

// File: @openzeppelin/contracts/introspection/ERC165.sol

pragma solidity ^0.5.0;


/**
 * @dev Implementation of the `IERC165` interface.
 *
 * Contracts may inherit from this and call `_registerInterface` to declare
 * their support of an interface.
 */
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) external view 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 {
        require(interfaceId != 0xffffffff, "ERC165: invalid interface id");
        _supportedInterfaces[interfaceId] = true;
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721.sol

pragma solidity ^0.5.0;







/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is ERC165, IERC721 {
    using SafeMath for uint256;
    using Address for address;
    using Counters for Counters.Counter;

    // Equals to `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`
    // which can be also obtained as `IERC721Receiver(0).onERC721Received.selector`
    bytes4 private constant _ERC721_RECEIVED = 0x150b7a02;

    // Mapping from token ID to owner
    mapping (uint256 => address) private _tokenOwner;

    // Mapping from token ID to approved address
    mapping (uint256 => address) private _tokenApprovals;

    // Mapping from owner to number of owned token
    mapping (address => Counters.Counter) private _ownedTokensCount;

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

    /*
     *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
     *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
     *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
     *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
     *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
     *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c
     *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
     *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
     *
     *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
     *        0xa22cb465 ^ 0xe985e9c ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

    constructor () public {
        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
    }

    /**
     * @dev Gets the balance of the specified address.
     * @param owner address to query the balance of
     * @return uint256 representing the amount owned by the passed address
     */
    function balanceOf(address owner) public view returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");

        return _ownedTokensCount[owner].current();
    }

    /**
     * @dev Gets the owner of the specified token ID.
     * @param tokenId uint256 ID of the token to query the owner of
     * @return address currently marked as the owner of the given token ID
     */
    function ownerOf(uint256 tokenId) public view returns (address) {
        address owner = _tokenOwner[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");

        return owner;
    }

    /**
     * @dev Approves another address to transfer the given token ID
     * The zero address indicates there is no approved address.
     * There can only be one approved address per token at a given time.
     * Can only be called by the token owner or an approved operator.
     * @param to address to be approved for the given token ID
     * @param tokenId uint256 ID of the token to be approved
     */
    function approve(address to, uint256 tokenId) public {
        address owner = ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(msg.sender == owner || isApprovedForAll(owner, msg.sender),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _tokenApprovals[tokenId] = to;
        emit Approval(owner, to, tokenId);
    }

    /**
     * @dev Gets the approved address for a token ID, or zero if no address set
     * Reverts if the token ID does not exist.
     * @param tokenId uint256 ID of the token to query the approval of
     * @return address currently approved for the given token ID
     */
    function getApproved(uint256 tokenId) public view returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev Sets or unsets the approval of a given operator
     * An operator is allowed to transfer all tokens of the sender on their behalf.
     * @param to operator address to set the approval
     * @param approved representing the status of the approval to be set
     */
    function setApprovalForAll(address to, bool approved) public {
        require(to != msg.sender, "ERC721: approve to caller");

        _operatorApprovals[msg.sender][to] = approved;
        emit ApprovalForAll(msg.sender, to, approved);
    }

    /**
     * @dev Tells whether an operator is approved by a given owner.
     * @param owner owner address which you want to query the approval of
     * @param operator operator address which you want to query the approval of
     * @return bool whether the given operator is approved by the given owner
     */
    function isApprovedForAll(address owner, address operator) public view returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev Transfers the ownership of a given token ID to another address.
     * Usage of this method is discouraged, use `safeTransferFrom` whenever possible.
     * Requires the msg.sender to be the owner, approved, or operator.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function transferFrom(address from, address to, uint256 tokenId) public {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(msg.sender, tokenId), "ERC721: transfer caller is not owner nor approved");

        _transferFrom(from, to, tokenId);
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement `onERC721Received`,
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) public {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev Safely transfers the ownership of a given token ID to another address
     * If the target address is a contract, it must implement `onERC721Received`,
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeTransferFrom(address from, address to, uint256 tokenId, bytes memory _data) public {
        transferFrom(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether the specified token exists.
     * @param tokenId uint256 ID of the token to query the existence of
     * @return bool whether the token exists
     */
    function _exists(uint256 tokenId) internal view returns (bool) {
        address owner = _tokenOwner[tokenId];
        return owner != address(0);
    }

    /**
     * @dev Returns whether the given spender can transfer a given token ID.
     * @param spender address of the spender to query
     * @param tokenId uint256 ID of the token to be transferred
     * @return bool whether the msg.sender is approved for the given token ID,
     * is an operator of the owner, or is the owner of the token
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Internal function to mint a new token.
     * Reverts if the given token ID already exists.
     * @param to The address that will own the minted token
     * @param tokenId uint256 ID of the token to be minted
     */
    function _mint(address to, uint256 tokenId) internal {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _tokenOwner[tokenId] = to;
        _ownedTokensCount[to].increment();

        emit Transfer(address(0), to, tokenId);
    }

    /**
     * @dev Internal function to burn a specific token.
     * Reverts if the token does not exist.
     * Deprecated, use _burn(uint256) instead.
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(address owner, uint256 tokenId) internal {
        require(ownerOf(tokenId) == owner, "ERC721: burn of token that is not own");

        _clearApproval(tokenId);

        _ownedTokensCount[owner].decrement();
        _tokenOwner[tokenId] = address(0);

        emit Transfer(owner, address(0), tokenId);
    }

    /**
     * @dev Internal function to burn a specific token.
     * Reverts if the token does not exist.
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(uint256 tokenId) internal {
        _burn(ownerOf(tokenId), tokenId);
    }

    /**
     * @dev Internal function to transfer ownership of a given token ID to another address.
     * As opposed to transferFrom, this imposes no restrictions on msg.sender.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _transferFrom(address from, address to, uint256 tokenId) internal {
        require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _clearApproval(tokenId);

        _ownedTokensCount[from].decrement();
        _ownedTokensCount[to].increment();

        _tokenOwner[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Internal function to invoke `onERC721Received` on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * This function is deprecated.
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param _data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(address from, address to, uint256 tokenId, bytes memory _data)
        internal returns (bool)
    {
        if (!to.isContract()) {
            return true;
        }

        bytes4 retval = IERC721Receiver(to).onERC721Received(msg.sender, from, tokenId, _data);
        return (retval == _ERC721_RECEIVED);
    }

    /**
     * @dev Private function to clear current approval of a given token ID.
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _clearApproval(uint256 tokenId) private {
        if (_tokenApprovals[tokenId] != address(0)) {
            _tokenApprovals[tokenId] = address(0);
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Enumerable.sol

pragma solidity ^0.5.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract IERC721Enumerable is IERC721 {
    function totalSupply() public view returns (uint256);
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256 tokenId);

    function tokenByIndex(uint256 index) public view returns (uint256);
}

// File: @openzeppelin/contracts/token/ERC721/ERC721Enumerable.sol

pragma solidity ^0.5.0;




/**
 * @title ERC-721 Non-Fungible Token with optional enumeration extension logic
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721Enumerable is ERC165, ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => uint256[]) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /*
     *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
     *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
     *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
     *
     *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
     */
    bytes4 private constant _INTERFACE_ID_ERC721_ENUMERABLE = 0x780e9d63;

    /**
     * @dev Constructor function.
     */
    constructor () public {
        // register the supported interface to conform to ERC721Enumerable via ERC165
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

    /**
     * @dev Gets the token ID at a given index of the tokens list of the requested owner.
     * @param owner address owning the tokens list to be accessed
     * @param index uint256 representing the index to be accessed of the requested tokens list
     * @return uint256 token ID at the given index of the tokens list owned by the requested address
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view returns (uint256) {
        require(index < balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev Gets the total amount of tokens stored by the contract.
     * @return uint256 representing the total amount of tokens
     */
    function totalSupply() public view returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev Gets the token ID at a given index of all the tokens in this contract
     * Reverts if the index is greater or equal to the total number of tokens.
     * @param index uint256 representing the index to be accessed of the tokens list
     * @return uint256 token ID at the given index of the tokens list
     */
    function tokenByIndex(uint256 index) public view returns (uint256) {
        require(index < totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Internal function to transfer ownership of a given token ID to another address.
     * As opposed to transferFrom, this imposes no restrictions on msg.sender.
     * @param from current owner of the token
     * @param to address to receive the ownership of the given token ID
     * @param tokenId uint256 ID of the token to be transferred
     */
    function _transferFrom(address from, address to, uint256 tokenId) internal {
        super._transferFrom(from, to, tokenId);

        _removeTokenFromOwnerEnumeration(from, tokenId);

        _addTokenToOwnerEnumeration(to, tokenId);
    }

    /**
     * @dev Internal function to mint a new token.
     * Reverts if the given token ID already exists.
     * @param to address the beneficiary that will own the minted token
     * @param tokenId uint256 ID of the token to be minted
     */
    function _mint(address to, uint256 tokenId) internal {
        super._mint(to, tokenId);

        _addTokenToOwnerEnumeration(to, tokenId);

        _addTokenToAllTokensEnumeration(tokenId);
    }

    /**
     * @dev Internal function to burn a specific token.
     * Reverts if the token does not exist.
     * Deprecated, use _burn(uint256) instead.
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned
     */
    function _burn(address owner, uint256 tokenId) internal {
        super._burn(owner, tokenId);

        _removeTokenFromOwnerEnumeration(owner, tokenId);
        // Since tokenId will be deleted, we can clear its slot in _ownedTokensIndex to trigger a gas refund
        _ownedTokensIndex[tokenId] = 0;

        _removeTokenFromAllTokensEnumeration(tokenId);
    }

    /**
     * @dev Gets the list of token IDs of the requested owner.
     * @param owner address owning the tokens
     * @return uint256[] List of token IDs owned by the requested address
     */
    function _tokensOfOwner(address owner) internal view returns (uint256[] storage) {
        return _ownedTokens[owner];
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        _ownedTokensIndex[tokenId] = _ownedTokens[to].length;
        _ownedTokens[to].push(tokenId);
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the _ownedTokensIndex mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _ownedTokens[from].length.sub(1);
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        _ownedTokens[from].length--;

        // Note that _ownedTokensIndex[tokenId] hasn't been cleared: it still points to the old slot (now occupied by
        // lastTokenId, or just over the end of the array if the token was the last one).
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length.sub(1);
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        _allTokens.length--;
        _allTokensIndex[tokenId] = 0;
    }
}

// File: @openzeppelin/contracts/token/ERC721/IERC721Metadata.sol

pragma solidity ^0.5.0;


/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
contract IERC721Metadata is IERC721 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// File: @openzeppelin/contracts/token/ERC721/ERC721Metadata.sol

pragma solidity ^0.5.0;




contract ERC721Metadata is ERC165, ERC721, IERC721Metadata {
    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Optional mapping for token URIs
    mapping(uint256 => string) private _tokenURIs;

    /*
     *     bytes4(keccak256('name()')) == 0x06fdde03
     *     bytes4(keccak256('symbol()')) == 0x95d89b41
     *     bytes4(keccak256('tokenURI(uint256)')) == 0xc87b56dd
     *
     *     => 0x06fdde03 ^ 0x95d89b41 ^ 0xc87b56dd == 0x5b5e139f
     */
    bytes4 private constant _INTERFACE_ID_ERC721_METADATA = 0x5b5e139f;

    /**
     * @dev Constructor function
     */
    constructor (string memory name, string memory symbol) public {
        _name = name;
        _symbol = symbol;

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
    }

    /**
     * @dev Gets the token name.
     * @return string representing the token name
     */
    function name() external view returns (string memory) {
        return _name;
    }

    /**
     * @dev Gets the token symbol.
     * @return string representing the token symbol
     */
    function symbol() external view returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns an URI for a given token ID.
     * Throws if the token ID does not exist. May return an empty string.
     * @param tokenId uint256 ID of the token to query
     */
    function tokenURI(uint256 tokenId) external view returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");
        return _tokenURIs[tokenId];
    }

    /**
     * @dev Internal function to set the token URI for a given token.
     * Reverts if the token ID does not exist.
     * @param tokenId uint256 ID of the token to set its URI
     * @param uri string URI to assign
     */
    function _setTokenURI(uint256 tokenId, string memory uri) internal {
        require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = uri;
    }

    /**
     * @dev Internal function to burn a specific token.
     * Reverts if the token does not exist.
     * Deprecated, use _burn(uint256) instead.
     * @param owner owner of the token to burn
     * @param tokenId uint256 ID of the token being burned by the msg.sender
     */
    function _burn(address owner, uint256 tokenId) internal {
        super._burn(owner, tokenId);

        // Clear metadata (if any)
        if (bytes(_tokenURIs[tokenId]).length != 0) {
            delete _tokenURIs[tokenId];
        }
    }
}

// File: @openzeppelin/contracts/token/ERC721/ERC721Full.sol

pragma solidity ^0.5.0;




/**
 * @title Full ERC721 Token
 * This implementation includes all the required and some optional functionality of the ERC721 standard
 * Moreover, it includes approve all functionality using operator terminology
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721Full is ERC721, ERC721Enumerable, ERC721Metadata {
    constructor (string memory name, string memory symbol) public ERC721Metadata(name, symbol) {
        // solhint-disable-previous-line no-empty-blocks
    }
}

// File: contracts/libs/String.sol

pragma solidity ^0.5.11;

library String {

    /**
     * @dev Convert bytes32 to string.
     * @param _x - to be converted to string.
     * @return string
     */
    function bytes32ToString(bytes32 _x) internal pure returns (string memory) {
        bytes memory bytesString = new bytes(32);
        uint charCount = 0;
        for (uint j = 0; j < 32; j++) {
            byte char = byte(bytes32(uint(_x) * 2 ** (8 * j)));
            if (char != 0) {
                bytesString[charCount] = char;
                charCount++;
            }
        }
        bytes memory bytesStringTrimmed = new bytes(charCount);
        for (uint j = 0; j < charCount; j++) {
            bytesStringTrimmed[j] = bytesString[j];
        }
        return string(bytesStringTrimmed);
    }

    /**
     * @dev Convert uint to string.
     * @param _i - uint256 to be converted to string.
     * @return uint in string
     */
    function uintToString(uint _i) internal pure returns (string memory _uintAsString) {
        uint i = _i;

        if (i == 0) {
            return "0";
        }
        uint j = i;
        uint len;
        while (j != 0) {
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (i != 0) {
            bstr[k--] = byte(uint8(48 + i % 10));
            i /= 10;
        }
        return string(bstr);
    }
}

// File: contracts/ERC721BaseCollection.sol

pragma solidity ^0.5.11;




contract ERC721BaseCollection is Ownable, ERC721Full {
    using String for bytes32;
    using String for uint256;

    mapping(bytes32 => uint256) public maxIssuance;
    mapping(bytes32 => uint) public issued;
    mapping(uint256 => string) internal _tokenPaths;
    mapping(address => bool) public allowed;

    string[] public wearables;

    string public baseURI;
    bool public isComplete;

    event BaseURI(string _oldBaseURI, string _newBaseURI);
    event Allowed(address indexed _operator, bool _allowed);
    event AddWearable(bytes32 indexed _wearableIdKey, string _wearableId, uint256 _maxIssuance);
    event Issue(address indexed _beneficiary, uint256 indexed _tokenId, bytes32 indexed _wearableIdKey, string _wearableId, uint256 _issuedId);
    event Complete();


    /**
     * @dev Create the contract.
     * @param _name - name of the contract
     * @param _symbol - symbol of the contract
     * @param _operator - Address allowed to mint tokens
     * @param _baseURI - base URI for token URIs
     */
    constructor(string memory _name, string memory _symbol, address _operator, string memory _baseURI) public ERC721Full(_name, _symbol) {
        setAllowed(_operator, true);
        setBaseURI(_baseURI);
    }

    modifier onlyAllowed() {
        require(allowed[msg.sender], "Only an `allowed` address can issue tokens");
        _;
    }


    /**
     * @dev Set Base URI.
     * @param _baseURI - base URI for token URIs
     */
    function setBaseURI(string memory _baseURI) public onlyOwner {
        emit BaseURI(baseURI, _baseURI);
        baseURI = _baseURI;
    }

    /**
     * @dev Set allowed account to issue tokens.
     * @param _operator - Address allowed to issue tokens
     * @param _allowed - Whether is allowed or not
     */
    function setAllowed(address _operator, bool _allowed) public onlyOwner {
        require(_operator != address(0), "Invalid address");
        require(allowed[_operator] != _allowed, "You should set a different value");

        allowed[_operator] = _allowed;
        emit Allowed(_operator, _allowed);
    }


    /**
     * @dev Returns an URI for a given token ID.
     * Throws if the token ID does not exist. May return an empty string.
     * @param _tokenId - uint256 ID of the token queried
     * @return token URI
     */
    function tokenURI(uint256 _tokenId) external view returns (string memory) {
        require(_exists(_tokenId), "ERC721Metadata: received a URI query for a nonexistent token");
        return string(abi.encodePacked(baseURI, _tokenPaths[_tokenId]));
    }


    /**
     * @dev Transfers the ownership of given tokens ID to another address.
     * Usage of this method is discouraged, use {safeBatchTransferFrom} whenever possible.
     * Requires the msg.sender to be the owner, approved, or operator.
     * @param _from current owner of the token
     * @param _to address to receive the ownership of the given token ID
     * @param _tokenIds uint256 ID of the token to be transferred
     */
    function batchTransferFrom(address _from, address _to, uint256[] calldata _tokenIds) external {
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            transferFrom(_from, _to, _tokenIds[i]);
        }
    }

    /**
     * @dev Returns the wearables length.
     * @return wearable length
     */
    function wearablesCount() external view returns (uint256) {
        return wearables.length;
    }

    /**
     * @dev Complete the collection.
     * @notice that it will only prevent for adding more wearables.
     * The issuance is still allowed.
     */
    function completeCollection() external onlyOwner {
        require(!isComplete, "The collection is already completed");
        isComplete = true;
        emit Complete();
    }

     /**
     * @dev Add a new wearable to the collection.
     * @notice that this method should only allow wearableIds less than or equal to 32 bytes
     * @param _wearableIds - wearable ids
     * @param _maxIssuances - total supply for the wearables
     */
    function addWearables(bytes32[] calldata _wearableIds, uint256[] calldata _maxIssuances) external onlyOwner {
        require(_wearableIds.length == _maxIssuances.length, "Parameters should have the same length");

        for (uint256 i = 0; i < _wearableIds.length; i++) {
            addWearable(_wearableIds[i].bytes32ToString(), _maxIssuances[i]);
        }
    }

    /**
     * @dev Add a new wearable to the collection.
     * @notice that this method allows wearableIds of any size. It should be used
     * if a wearableId is greater than 32 bytes
     * @param _wearableId - wearable id
     * @param _maxIssuance - total supply for the wearable
     */
    function addWearable(string memory _wearableId, uint256 _maxIssuance) public onlyOwner {
        require(!isComplete, "The collection is complete");
        bytes32 key = getWearableKey(_wearableId);

        require(maxIssuance[key] == 0, "Can not modify an existing wearable");
        require(_maxIssuance > 0, "Max issuance should be greater than 0");

        maxIssuance[key] = _maxIssuance;
        wearables.push(_wearableId);

        emit AddWearable(key, _wearableId, _maxIssuance);
    }

    /**
     * @dev Safely transfers the ownership of given token IDs to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param _from - current owner of the token
     * @param _to - address to receive the ownership of the given token ID
     * @param _tokenIds - uint256 IDs of the tokens to be transferred
     */
    function safeBatchTransferFrom(address _from, address _to, uint256[] memory _tokenIds) public {
        safeBatchTransferFrom(_from, _to, _tokenIds, "");
    }

    /**
     * @dev Safely transfers the ownership of given token IDs to another address
     * If the target address is a contract, it must implement {IERC721Receiver-onERC721Received},
     * which is called upon a safe transfer, and return the magic value
     * `bytes4(keccak256("onERC721Received(address,address,uint256,bytes)"))`; otherwise,
     * the transfer is reverted.
     * Requires the msg.sender to be the owner, approved, or operator
     * @param _from - current owner of the token
     * @param _to - address to receive the ownership of the given token ID
     * @param _tokenIds - uint256 ID of the tokens to be transferred
     * @param _data bytes data to send along with a safe transfer check
     */
    function safeBatchTransferFrom(address _from, address _to, uint256[] memory _tokenIds, bytes memory _data) public {
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            safeTransferFrom(_from, _to, _tokenIds[i], _data);
        }
    }

    /**
     * @dev Get keccak256 of a wearableId.
     * @param _wearableId - token wearable
     * @return bytes32 keccak256 of the wearableId
     */
    function getWearableKey(string memory _wearableId) public pure returns (bytes32) {
        return keccak256(abi.encodePacked(_wearableId));
    }

    /**
     * @dev Mint a new NFT of the specified kind.
     * @notice that will throw if kind has reached its maximum or is invalid
     * @param _beneficiary - owner of the token
     * @param _tokenId - token
     * @param _wearableIdKey - wearable key
     * @param _wearableId - token wearable
     * @param _issuedId - issued id
     */
    function _mint(
        address _beneficiary,
        uint256 _tokenId,
        bytes32 _wearableIdKey,
        string memory _wearableId,
        uint256 _issuedId
    ) internal {
        // Check issuance
        require(
            _issuedId > 0 && _issuedId <= maxIssuance[_wearableIdKey],
            "Invalid issued id"
        );
        require(issued[_wearableIdKey] < maxIssuance[_wearableIdKey], "Option exhausted");

        // Mint erc721 token
        super._mint(_beneficiary, _tokenId);

        // Increase issuance
        issued[_wearableIdKey] = issued[_wearableIdKey] + 1;

        // Log
        emit Issue(_beneficiary, _tokenId, _wearableIdKey, _wearableId, _issuedId);
    }
}

// File: contracts/ERC721Collection.sol

pragma solidity ^0.5.11;




contract ERC721Collection is Ownable, ERC721Full, ERC721BaseCollection {
    /**
     * @dev Create the contract.
     * @param _name - name of the contract
     * @param _symbol - symbol of the contract
     * @param _operator - Address allowed to mint tokens
     * @param _baseURI - base URI for token URIs
     */
    constructor(
        string memory _name,
        string memory _symbol,
        address _operator,
        string memory _baseURI
    ) public ERC721BaseCollection(_name, _symbol, _operator, _baseURI) {}

    /**
     * @dev Issue a new NFT of the specified kind.
     * @notice that will throw if kind has reached its maximum or is invalid
     * @param _beneficiary - owner of the token
     * @param _wearableId - token wearable
     */
    function issueToken(address _beneficiary, string calldata _wearableId) external onlyAllowed {
        _issueToken(_beneficiary, _wearableId);
    }

    /**
     * @dev Issue NFTs.
     * @notice that will throw if kind has reached its maximum or is invalid
     * @param _beneficiaries - owner of the tokens
     * @param _wearableIds - token wearables
     */
    function issueTokens(address[] calldata _beneficiaries, bytes32[] calldata _wearableIds) external onlyAllowed {
        require(_beneficiaries.length == _wearableIds.length, "Parameters should have the same length");

        for(uint256 i = 0; i < _wearableIds.length; i++) {
            _issueToken(_beneficiaries[i], _wearableIds[i].bytes32ToString());
        }
    }

    /**
     * @dev Returns an URI for a given token ID.
     * Throws if the token ID does not exist. May return an empty string.
     * @param _tokenId - uint256 ID of the token queried
     * @return token URI
     */
    function tokenURI(uint256 _tokenId) external view returns (string memory) {
        require(_exists(_tokenId), "ERC721Metadata: received a URI query for a nonexistent token");
        return string(abi.encodePacked(baseURI, _tokenPaths[_tokenId]));
    }

    /**
     * @dev Issue a new NFT of the specified kind.
     * @notice that will throw if kind has reached its maximum or is invalid
     * @param _beneficiary - owner of the token
     * @param _wearableId - token wearable
     */
    function _issueToken(address _beneficiary, string memory _wearableId) internal {
        bytes32 key = getWearableKey(_wearableId);
        uint256 issuedId = issued[key] + 1;
        uint256 tokenId = this.totalSupply();

        _mint(_beneficiary, tokenId, key, _wearableId, issuedId);
        _setTokenURI(
            tokenId,
            string(abi.encodePacked(_wearableId, "/", issuedId.uintToString()))
        );
    }

    /**
     * @dev Internal function to set the token URI for a given token.
     * Reverts if the token ID does not exist.
     * @param _tokenId - uint256 ID of the token to set as its URI
     * @param _uri - string URI to assign
     */
    function _setTokenURI(uint256 _tokenId, string memory _uri) internal {
        _tokenPaths[_tokenId] = _uri;
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://46832d0b5f3d9638148b3383c856c3314f89b534b6997f8937a081c9f39eb1b6
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.