Contract 0x5FaFCd75E814a3912ba5832Cbfed3c914Ee16754 1

Token Contract 
 
 
Txn Hash
Method
Block
From
To
Value
0x436e2bf246b07bb1ee08d3b2ca97c75f0748d7bfac33ab5b23583fe13eee3ac6Safe Transfer Fr...160311942022-11-23 7:26:113 days 6 hrs ago0x7c253f3cd85383dc670fc64fab317f73bc0b2ab9 IN  LIL’ HIPPO: HIPPO Token0 Ether0.0012421 13.54475706
0x52ff786ef0eda4b8f4a0ac09dfb2d55c8920257b3ee63537add1590f813a1c98Safe Transfer Fr...160311912022-11-23 7:25:353 days 6 hrs ago0x7c253f3cd85383dc670fc64fab317f73bc0b2ab9 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00106705 13.43824032
0x7c654ddfe7d609c77ae49451d7e841f62183bebb099e54096191308c0dec7009Safe Transfer Fr...160311882022-11-23 7:24:593 days 6 hrs ago0x7c253f3cd85383dc670fc64fab317f73bc0b2ab9 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00146227 14.33802664
0xdccb37f0099e4a443f6809fdf16703732610035373811bfe834ee85185a2f614Safe Transfer Fr...160311852022-11-23 7:24:233 days 6 hrs ago0x7c253f3cd85383dc670fc64fab317f73bc0b2ab9 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00107205 13.50132261
0x0b3499a902d46a5a10dc1160dbaa916bde3dcfec338a0f06f925d8d3e45db181Safe Transfer Fr...160311792022-11-23 7:23:113 days 6 hrs ago0x7c253f3cd85383dc670fc64fab317f73bc0b2ab9 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00103793 13.07151092
0xdde7922c0284adc16186dd19e6fabea4c0a9987be37344d165776d81ec4f88e0Safe Transfer Fr...160311562022-11-23 7:18:353 days 6 hrs ago0x58668b2929166b35d21c4c31946679be662c9f21 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00112865 12.30754567
0x8387f9c2d15fb370f9e51f209c870c190e58ea0ece95eab5031adac192f02f5fTransfer From159896822022-11-17 12:16:239 days 1 hr ago0xdd4b286d3ce7dd3c63d448750726a85c10a34905 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00131437 13.64014955
0xc216dbf2e84664aa0d50bc0538daafccd7e9d34090ff8f38b3f7b08788bad227Transfer From159650412022-11-14 1:38:2312 days 12 hrs ago0xc0efe9de34f0348e216d84887780cc5ebcf0c782 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00147183 16.55994632
0xb0bfc5b3b60d24e943a2aa4a08da9bf5c4d402ada164e8a113914d69e2eeec68Transfer From159650412022-11-14 1:38:2312 days 12 hrs ago0xc0efe9de34f0348e216d84887780cc5ebcf0c782 IN  LIL’ HIPPO: HIPPO Token0 Ether0.0016421 16.55994632
0x9873577d316e195ec8cc034371da402eb5148f535c11b1f6cea1ef24e9da8715Transfer From159650172022-11-14 1:33:3512 days 12 hrs ago0xc0efe9de34f0348e216d84887780cc5ebcf0c782 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00160139 20.91172738
0x5b46bcbb792c7e76e6d4b1b11ec2ba5d303d1084f596f477eb19a06295ed8c67Transfer From159650172022-11-14 1:33:3512 days 12 hrs ago0xc0efe9de34f0348e216d84887780cc5ebcf0c782 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00175786 20.91172738
0x2b7056590c08c04518d5ea425e9d6ccc07648fb10c11cdfd9a08a73e91cd4fe6Transfer From159650172022-11-14 1:33:3512 days 12 hrs ago0xc0efe9de34f0348e216d84887780cc5ebcf0c782 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00181641 20.91172738
0xb17290cebb02a7ee791e9c958a1f68756985b78148d2937570df348968ab96b2Transfer From159650172022-11-14 1:33:3512 days 12 hrs ago0xc0efe9de34f0348e216d84887780cc5ebcf0c782 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00207362 20.91172738
0x151056ccdec773848f6f47de5ad2e4e3de28adc5458d81e8b86973f4173227c4Set Approval For...159434372022-11-11 1:16:1115 days 12 hrs ago0x71d32667c6674d18bfe71713c5bea3b77427b594 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00081429 16.69595941
0x0bd17aec7e19df5a727653ad74a2daa259632c8e95577b492b253ce9a39ec79dBatch Airdrop159380622022-11-10 7:14:5916 days 6 hrs agoLIL’ HIPPO: Deployer IN  LIL’ HIPPO: HIPPO Token0 Ether0.00313158 19.87831308
0x5b0084dc2a494e7fb6ad12c6860fecf79e5218c19b4637712e645721886ed8fdWithdraw159380512022-11-10 7:12:4716 days 6 hrs agoLIL’ HIPPO: Deployer IN  LIL’ HIPPO: HIPPO Token0 Ether0.00139732 21.36284664
0x6a9000e4a0eb4bb0ae2ef3a054322348cd27fde21e5b29d03f0ac639726df0d3Mint159348342022-11-09 20:25:2316 days 17 hrs ago0x2a7607250aae4f1a27984f7c38e2fdef0b1e404a IN  LIL’ HIPPO: HIPPO Token0.05 Ether0.00862665 45.02899387
0x7d8255becba43b9b7eec202974a0a9ff1b526fd338bc0efb81ad00a9b9ed1452Safe Transfer Fr...159343962022-11-09 18:56:4716 days 18 hrs agoFake_Phishing7045 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00885472 93.81597758
0x6d5c5038b86267b274ee5f54ec2c7672c9dd2921f19fd15a9916364fc450022aSafe Transfer Fr...159343962022-11-09 18:56:4716 days 18 hrs agoFake_Phishing7045 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00981934 93.81597758
0xfaf5d927beed5a0b2d1c190dbdbea0200aa4b0f750dba3f6383d6ff1211d1e5aSafe Transfer Fr...159343962022-11-09 18:56:4716 days 18 hrs agoFake_Phishing7045 IN  LIL’ HIPPO: HIPPO Token0 Ether0.0086654 93.81597758
0xfefdb21674e823cbc2ea0f5c2d787e4d063257086c5e4d5c63a4bd64330a2c89Safe Transfer Fr...159343962022-11-09 18:56:4716 days 18 hrs agoFake_Phishing7045 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00981934 93.81597758
0x0dbee755c67379ad3e0e9fd2a7196e5d1b182886ac2bdb4691ca1e9aa7f0053bSafe Transfer Fr...159343962022-11-09 18:56:4716 days 18 hrs agoFake_Phishing7045 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00840272 93.81597758
0xbc8e92464ee08a18fed30d144f5c775c271891a2dbc1dbc0049c22240a67adfeSafe Transfer Fr...159343962022-11-09 18:56:4716 days 18 hrs agoFake_Phishing7045 IN  LIL’ HIPPO: HIPPO Token0 Ether0.00981934 93.81597758
0xbcd4023467af0f64a78a1f03e6c82dd0fc41d042d51c9d7ba5e188661d20583aSet Approval For...159343822022-11-09 18:53:5916 days 18 hrs ago0xe279f304d6e2049176e48a02315c13c61a7d28ff IN  LIL’ HIPPO: HIPPO Token0 Ether0.00479578 98.20989162
0x1f7c74116250823e934902a0d9d147575473d58aab96b5b2c0d15ea852c22f45Set Approval For...159302572022-11-09 5:01:5917 days 8 hrs ago0x182b498a386a21c5470bc426580075fe8367974b IN  LIL’ HIPPO: HIPPO Token0 Ether0.00073469 15.06381291
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OVERVIEW

Collection of 10,000 Lil' Hippo NFTs.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x5b0084dc2a494e7fb6ad12c6860fecf79e5218c19b4637712e645721886ed8fd159380512022-11-10 7:12:4716 days 6 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.0025 Ether
0x5b0084dc2a494e7fb6ad12c6860fecf79e5218c19b4637712e645721886ed8fd159380512022-11-10 7:12:4716 days 6 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.0475 Ether
0x545ba8b98b19f2e3f13907f437ca56999d88f1966bbcfdef3ce0405db0c27db3159011752022-11-05 3:37:2321 days 10 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.005 Ether
0x545ba8b98b19f2e3f13907f437ca56999d88f1966bbcfdef3ce0405db0c27db3159011752022-11-05 3:37:2321 days 10 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.095 Ether
0xc7a71fa81420fe7fe6605c97212459e27b40e0d75d1b218d3c2f4ff3bb0abbca158879222022-11-03 7:11:1123 days 6 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.0175 Ether
0xc7a71fa81420fe7fe6605c97212459e27b40e0d75d1b218d3c2f4ff3bb0abbca158879222022-11-03 7:11:1123 days 6 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.3325 Ether
0xffa17222f305efb98b1a753531166b2c6d2cdd2bc1a4ce3f80e98b7c53fbabc4158138682022-10-23 22:43:3533 days 15 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.01 Ether
0xffa17222f305efb98b1a753531166b2c6d2cdd2bc1a4ce3f80e98b7c53fbabc4158138682022-10-23 22:43:3533 days 15 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.19 Ether
0xf608831881d5052bc114e6ea291199857c6f535da6838854b2bb9e78bdbc2044157314062022-10-12 10:22:3545 days 3 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.015 Ether
0xf608831881d5052bc114e6ea291199857c6f535da6838854b2bb9e78bdbc2044157314062022-10-12 10:22:3545 days 3 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.285 Ether
0xed6909db81c442af67f73c18864c266a43efd413d989baf9827848b5164bb6b3155179252022-09-12 0:37:4375 days 13 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.0225 Ether
0xed6909db81c442af67f73c18864c266a43efd413d989baf9827848b5164bb6b3155179252022-09-12 0:37:4375 days 13 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.4275 Ether
0x693ef502134df5bc1a44339a3b65e598be8bf3f454582e3095f28589a004b512154336112022-08-29 10:34:4189 days 3 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.0225 Ether
0x693ef502134df5bc1a44339a3b65e598be8bf3f454582e3095f28589a004b512154336112022-08-29 10:34:4189 days 3 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.4275 Ether
0x045f188b725f58dfd001cbd497028ffc266c42932b165404b6e326d91ad3213d153991952022-08-23 22:07:0594 days 15 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.0125 Ether
0x045f188b725f58dfd001cbd497028ffc266c42932b165404b6e326d91ad3213d153991952022-08-23 22:07:0594 days 15 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.2375 Ether
0x06e820c9f40f7e1d429f2d86ce7408ae1bbd127b46c63fee66d518cc10b74817153297772022-08-12 22:52:34105 days 14 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.014 Ether
0x06e820c9f40f7e1d429f2d86ce7408ae1bbd127b46c63fee66d518cc10b74817153297772022-08-12 22:52:34105 days 14 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.266 Ether
0x9df34c090d294c913a304dbea8adc928b97b220e905c97599a7796c59d3588e7152940242022-08-07 8:12:28111 days 5 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.0455 Ether
0x9df34c090d294c913a304dbea8adc928b97b220e905c97599a7796c59d3588e7152940242022-08-07 8:12:28111 days 5 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.8645 Ether
0x7db0cbe80987373cc3e473b7753d5c30ecbb7f2606e391b09f949b464d213aa8152805752022-08-05 6:03:06113 days 7 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.035 Ether
0x7db0cbe80987373cc3e473b7753d5c30ecbb7f2606e391b09f949b464d213aa8152805752022-08-05 6:03:06113 days 7 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.665 Ether
0xacea42772e50b75783e199aed27a9d787e8d2588bee203682107e99d364341b0152533992022-08-01 0:23:35117 days 13 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.008 Ether
0xacea42772e50b75783e199aed27a9d787e8d2588bee203682107e99d364341b0152533992022-08-01 0:23:35117 days 13 hrs ago LIL’ HIPPO: HIPPO TokenLIL’ HIPPO: Deployer0.152 Ether
0xbfcbd46bd9c15ef0076f74f9d98157e66c326f11e7433f08dc619298f53dc67e152423742022-07-30 7:13:55119 days 6 hrs ago LIL’ HIPPO: HIPPO Token 0x370a695f879b665db5745de917105208a1dc61fd0.036 Ether
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Minimal Proxy Contract for 0x951d77b7ce4caa3e48c3c3bcd694e5a909006d4d

Contract Name:
DropKitCollection

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 99999 runs

Other Settings:
default evmVersion
Decompile ByteCode

Contract Source Code (Solidity Standard Json-Input format)

File 1 of 17 : DropKitCollection.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/math/SafeMathUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721EnumerableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/utils/cryptography/MerkleProofUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "./IDropKit.sol";

contract DropKitCollection is
    ERC721Upgradeable,
    ERC721EnumerableUpgradeable,
    OwnableUpgradeable
{
    using AddressUpgradeable for address;
    using SafeMathUpgradeable for uint256;
    using MerkleProofUpgradeable for bytes32[];

    IDropKit private _dropKit;

    mapping(address => uint256) private _mintCount;
    uint256 private _totalRevenue;
    bytes32 private _merkleRoot;
    string private _tokenBaseURI;
    address private _treasury;

    // Sales Parameters
    uint256 private _maxAmount;
    uint256 private _maxPerMint;
    uint256 private _maxPerWallet;
    uint256 private _price;

    // Auction Parameters
    uint256 private _startPrice;
    uint256 private _endPrice;
    uint256 private _duration;
    uint256 private _startedAt;

    // States
    bool private _presaleActive = false;
    bool private _saleActive = false;
    bool private _auctionActive = false;

    modifier onlyMintable(uint256 numberOfTokens) {
        require(numberOfTokens > 0, "Greater than 0");
        require(
            _mintCount[_msgSender()].add(numberOfTokens) <= _maxPerWallet,
            "Exceeded max"
        );
        require(
            totalSupply().add(numberOfTokens) <= _maxAmount,
            "Exceeded max"
        );
        _;
    }

    function initialize(
        string memory name_,
        string memory symbol_,
        address treasury_
    ) public initializer {
        __ERC721_init(name_, symbol_);
        __ERC721Enumerable_init();
        __Ownable_init();

        _dropKit = IDropKit(_msgSender());
        _treasury = treasury_;
    }

    function mint(uint256 numberOfTokens)
        public
        payable
        onlyMintable(numberOfTokens)
    {
        require(!_presaleActive, "Not active");
        require(_auctionActive || _saleActive, "Not active");

        _purchaseMint(numberOfTokens, _msgSender());
    }

    function presaleMint(uint256 numberOfTokens, bytes32[] calldata proof)
        public
        payable
        onlyMintable(numberOfTokens)
    {
        require(_presaleActive, "Not active");
        require(_merkleRoot != "", "Not active");
        require(
            MerkleProofUpgradeable.verify(
                proof,
                _merkleRoot,
                keccak256(abi.encodePacked(_msgSender()))
            ),
            "Not active"
        );

        _purchaseMint(numberOfTokens, _msgSender());
    }

    function batchAirdrop(
        uint256[] calldata numberOfTokens,
        address[] calldata recipients
    ) external onlyOwner {
        require(numberOfTokens.length == recipients.length);

        for (uint256 i = 0; i < recipients.length; i++) {
            _mint(numberOfTokens[i], recipients[i]);
        }
    }

    function setMerkleRoot(bytes32 newRoot) public onlyOwner {
        _merkleRoot = newRoot;
    }

    function startSale(
        uint256 newMaxAmount,
        uint256 newMaxPerMint,
        uint256 newMaxPerWallet,
        uint256 newPrice,
        bool presale
    ) public onlyOwner {
        _saleActive = true;
        _presaleActive = presale;

        _maxAmount = newMaxAmount;
        _maxPerMint = newMaxPerMint;
        _maxPerWallet = newMaxPerWallet;
        _price = newPrice;
    }

    function startAuction(
        uint256 newMaxAmount,
        uint256 newMaxPerMint,
        uint256 newMaxPerWallet,
        uint256 newStartPrice,
        uint256 newEndPrice,
        uint256 newDuration,
        bool presale
    ) public onlyOwner {
        _auctionActive = true;
        _presaleActive = presale;

        _startedAt = block.timestamp;
        _maxAmount = newMaxAmount;
        _maxPerMint = newMaxPerMint;
        _maxPerWallet = newMaxPerWallet;
        _endPrice = newEndPrice;
        _startPrice = newStartPrice;
        _duration = newDuration;
    }

    function stopSale() public onlyOwner {
        _saleActive = false;
        _auctionActive = false;
        _presaleActive = false;
    }

    function withdraw() public {
        require(address(this).balance > 0, "0 balance");

        uint256 balance = address(this).balance;
        uint256 fees = _dropKit.getFees(address(this));
        AddressUpgradeable.sendValue(payable(_treasury), balance - fees);
        AddressUpgradeable.sendValue(payable(address(_dropKit)), fees);

        _dropKit.addFeesClaimed(fees);
    }

    function setBaseURI(string memory newBaseURI) public onlyOwner {
        _tokenBaseURI = newBaseURI;
    }

    function setTreasury(address newTreasury) public onlyOwner {
        _treasury = newTreasury;
    }

    function treasury() external view returns (address) {
        return _treasury;
    }

    function maxAmount() external view returns (uint256) {
        return _maxAmount;
    }

    function maxPerMint() external view returns (uint256) {
        return _maxPerMint;
    }

    function maxPerWallet() external view returns (uint256) {
        return _maxPerWallet;
    }

    function price() external view returns (uint256) {
        return _price;
    }

    function totalRevenue() external view returns (uint256) {
        return _totalRevenue;
    }

    function presaleActive() external view returns (bool) {
        return _presaleActive;
    }

    function saleActive() external view returns (bool) {
        return _saleActive;
    }

    function auctionActive() external view returns (bool) {
        return _auctionActive;
    }

    function auctionStartedAt() external view returns (uint256) {
        return _startedAt;
    }

    function auctionDuration() external view returns (uint256) {
        return _duration;
    }

    function auctionPrice() public view returns (uint256) {
        if ((block.timestamp - _startedAt) >= _duration) {
            return _endPrice;
        } else {
            return
                ((_duration - (block.timestamp - _startedAt)) *
                    (_startPrice - _endPrice)) /
                _duration +
                _endPrice;
        }
    }

    function _baseURI() internal view virtual override returns (string memory) {
        return _tokenBaseURI;
    }

    function _purchaseMint(uint256 numberOfTokens, address sender) internal {
        uint256 mintPrice = _auctionActive
            ? auctionPrice().mul(numberOfTokens)
            : _price.mul(numberOfTokens);
        require(mintPrice <= msg.value, "Value incorrect");

        _totalRevenue = _totalRevenue.add(msg.value);
        _dropKit.addFees(msg.value);
        _mintCount[sender] = _mintCount[sender].add(numberOfTokens);
        _mint(numberOfTokens, sender);
    }

    function _mint(uint256 numberOfTokens, address sender) internal {
        require(
            _maxAmount > 0
                ? totalSupply().add(numberOfTokens) <= _maxAmount
                : true,
            "Exceeded max"
        );

        for (uint256 i = 0; i < numberOfTokens; i++) {
            uint256 mintIndex = totalSupply() + 1;
            _safeMint(sender, mintIndex);
        }
    }

    // The following functions are overrides required by Solidity.
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal override(ERC721Upgradeable, ERC721EnumerableUpgradeable) {
        super._beforeTokenTransfer(from, to, tokenId);
    }

    function supportsInterface(bytes4 interfaceId)
        public
        view
        override(ERC721Upgradeable, ERC721EnumerableUpgradeable)
        returns (bool)
    {
        return super.supportsInterface(interfaceId);
    }
}

File 2 of 17 : AddressUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 3 of 17 : SafeMathUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMathUpgradeable {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

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

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

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

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

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

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

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

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

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

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

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

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

File 4 of 17 : ERC721Upgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
    using AddressUpgradeable for address;
    using StringsUpgradeable for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

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

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

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    function __ERC721_init(string memory name_, string memory symbol_) internal initializer {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC721_init_unchained(name_, symbol_);
    }

    function __ERC721_init_unchained(string memory name_, string memory symbol_) internal initializer {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
        return
            interfaceId == type(IERC721Upgradeable).interfaceId ||
            interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: balance query for the zero address");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _owners[tokenId];
        require(owner != address(0), "ERC721: owner query for nonexistent token");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overriden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        require(_exists(tokenId), "ERC721: approved query for nonexistent token");

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        require(operator != _msgSender(), "ERC721: approve to caller");

        _operatorApprovals[_msgSender()][operator] = approved;
        emit ApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _safeTransfer(from, to, tokenId, _data);
    }

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * `_data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, _data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _owners[tokenId] != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        require(_exists(tokenId), "ERC721: operator query for nonexistent token");
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory _data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, _data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;
        _owners[tokenId] = to;

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

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721Upgradeable.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId);

        // Clear approvals
        _approve(address(0), tokenId);

        _balances[owner] -= 1;
        delete _owners[tokenId];

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

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer of token that is not own");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId);

        // Clear approvals from the previous owner
        _approve(address(0), tokenId);

        _balances[from] -= 1;
        _balances[to] += 1;
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits a {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @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
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
    uint256[44] private __gap;
}

File 5 of 17 : ERC721EnumerableUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../ERC721Upgradeable.sol";
import "./IERC721EnumerableUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721EnumerableUpgradeable is Initializable, ERC721Upgradeable, IERC721EnumerableUpgradeable {
    function __ERC721Enumerable_init() internal initializer {
        __Context_init_unchained();
        __ERC165_init_unchained();
        __ERC721Enumerable_init_unchained();
    }

    function __ERC721Enumerable_init_unchained() internal initializer {
    }
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => 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;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165Upgradeable, ERC721Upgradeable) returns (bool) {
        return interfaceId == type(IERC721EnumerableUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Upgradeable.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721EnumerableUpgradeable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting
     * and burning.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s `tokenId` will be
     * transferred to `to`.
     * - When `from` is zero, `tokenId` will be minted for `to`.
     * - When `to` is zero, ``from``'s `tokenId` will be burned.
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, tokenId);

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @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 {
        uint256 length = ERC721Upgradeable.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @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 = ERC721Upgradeable.balanceOf(from) - 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
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @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 - 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
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
    uint256[46] private __gap;
}

File 6 of 17 : MerkleProofUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev These functions deal with verification of Merkle Trees proofs.
 *
 * The proofs can be generated using the JavaScript library
 * https://github.com/miguelmota/merkletreejs[merkletreejs].
 * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled.
 *
 * See `test/utils/cryptography/MerkleProof.test.js` for some examples.
 */
library MerkleProofUpgradeable {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(
        bytes32[] memory proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool) {
        bytes32 computedHash = leaf;

        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return computedHash == root;
    }
}

File 7 of 17 : OwnableUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

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

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        _setOwner(_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 {
        _setOwner(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");
        _setOwner(newOwner);
    }

    function _setOwner(address newOwner) private {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
    uint256[49] private __gap;
}

File 8 of 17 : IDropKit.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

interface IDropKit {
    /**
     * @dev Emitted when collection is created
     */
    event CollectionCreated(address indexed collectionAddress);

    /**
     * @dev Returns the commission amount.
     */
    function commission(uint256 amount) external view returns (uint256);

    /**
     * @dev Add fees from Collection
     */
    function addFees(uint256 amount) external;

    /**
     * @dev Add fees claimed by the Collection
     */
    function addFeesClaimed(uint256 amount) external;

    /**
     * @dev Get fees accrued by the account
     */
    function getFees(address account) external view returns (uint256);
}

File 9 of 17 : IERC721Upgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

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

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;
}

File 10 of 17 : IERC721ReceiverUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721ReceiverUpgradeable {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 11 of 17 : IERC721MetadataUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the token collection symbol.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

File 12 of 17 : ContextUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
    uint256[50] private __gap;
}

File 13 of 17 : StringsUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    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);
    }
}

File 14 of 17 : ERC165Upgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal initializer {
        __ERC165_init_unchained();
    }

    function __ERC165_init_unchained() internal initializer {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }
    uint256[50] private __gap;
}

File 15 of 17 : Initializable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     */
    bool private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Modifier to protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}

File 16 of 17 : IERC165Upgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @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 17 of 17 : IERC721EnumerableUpgradeable.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 99999
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract ABI

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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.