Contract 0x248F0913387eEf740B1DC73Ba81c815B748a8859

 
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0xda6919cfac082548ba6d0146e329490d56fd0e159ab92a977906fbe5b00bf969Set Approval For...156195502022-09-26 19:12:594 days 3 hrs agoENS Name themariokarters.eth IN  Degenerated: High Flyers0 Ether0.00083179 18.01004225
0xbf24b083ec7ec5cc435b0797de881e8b05aa9ebd01f1396d14536ad02400d6fbSet Approval For...156044762022-09-24 16:40:356 days 5 hrs agoENS Name kimd.eth IN  Degenerated: High Flyers0 Ether0.00031683 6.87090489
0xb1ba8b8e3cbc4e31686cfe3f918d5807d511fa498a9a38a8af83bc946a9af710Set Approval For...155538602022-09-17 14:21:4713 days 8 hrs ago0xc8ef2e76deae8394a632cd8403ce4b0993fd615a IN  Degenerated: High Flyers0 Ether0.00024391 10.04392612
0x84d83d3c445aef84069a4d787adce720f63ba7d7ad1820c8ab53912befcaf8ecSet Approval For...154277082022-08-28 12:08:5433 days 10 hrs ago0xeba8c66a090043edb92c8344f7ac9adc434054eb IN  Degenerated: High Flyers0 Ether0.00027382 5.9273361
0x0954e2671a15ab5e566440b7dbb8656051fa8da5d5deae7320313ba463432386Set Approval For...154276662022-08-28 11:59:1333 days 10 hrs ago0xeba8c66a090043edb92c8344f7ac9adc434054eb IN  Degenerated: High Flyers0 Ether0.00018026 3.90926281
0x421e0af247ce3629b111ab40b2c1926d9843a5a09943c2f34bdfa1c1ddf7ace0Safe Transfer Fr...153916462022-08-22 17:37:1639 days 5 hrs ago0xf9a7c18e8f6174b74b80b87bbc1f34d261433f91 IN  Degenerated: High Flyers0 Ether0.00134775 21.50690802
0x3a4f64162cb4e5ca83388c05c9a7b48032b87822d4811505a8e52124c76aaa78Set Approval For...153780852022-08-20 14:17:3441 days 8 hrs ago0x989bf85537342bb109237c185fa11d96a5fa54cf IN  Degenerated: High Flyers0 Ether0.00036714 7.9617578
0xd0e47e82b6c5074d2884fc72fbe14274fde38d2695fb03e76959a0a8291a61d0Transfer From153729082022-08-19 18:31:5442 days 4 hrs ago0x0c10db61de886ec1385542053dd76799af6ef7ad IN  Degenerated: High Flyers0 Ether0.00115931 19.39819799
0x80d9d81dddfd0a59c78209b778b95b4f8da18c005fef11a72be9c9bbce20e87cSet Approval For...153399272022-08-14 13:07:2047 days 9 hrs agoENS Name chamba.eth IN  Degenerated: High Flyers0 Ether0.00051242 11.09504968
0x260a2b8f1689e4a2bfa60a6e20512c5f0682cc5468a063eaf2fab54603799b5dSet Approval For...153340382022-08-13 14:49:2048 days 7 hrs ago0x2edfb1a49e62e2ac30d63405158b9c7ae799633e IN  Degenerated: High Flyers0 Ether0.00062585 13.57212082
0x8c9495fc12a8ffee835ac011954bac93d3fcecfbfab77d6184a17861b677ad76Set Approval For...153254402022-08-12 6:29:2349 days 16 hrs agoENS Name nftweb4.eth IN  Degenerated: High Flyers0 Ether0.00037195 8.05153005
0x3891a25a1d1210d7bab55dce33b3f2e48cc37a4e9031d8f6f64c94051b975c86Set Approval For...153253892022-08-12 6:17:4349 days 16 hrs agoENS Name nftweb4.eth IN  Degenerated: High Flyers0 Ether0.00032327 7.01053998
0xd4aab3865ba59fd981430daeabc10a127f851259577b87579920c9e80e9b6e14Set Approval For...153241722022-08-12 1:36:4149 days 21 hrs agoENS Name swishpak.eth IN  Degenerated: High Flyers0 Ether0.00060955 13.19474049
0xa75a083258344195ed4bf9ab4b57b1524759d82458dbd682e5fb3ab781a73609Set Approval For...153241682022-08-12 1:35:4349 days 21 hrs agoENS Name swishpak.eth IN  Degenerated: High Flyers0 Ether0.00072306 15.65177385
0x32b3afc0070574fb1865d9359a6ab90f03cfccdf8d72b8577f0f41f654a08326Set Approval For...153052762022-08-09 2:14:1252 days 20 hrs agoENS Name swishpak.eth IN  Degenerated: High Flyers0 Ether0.00054534 22.45615384
0x17ad8a25b328e761a5382fe605761a32db0fe126dfd44e318735c93500695399Set Approval For...152937762022-08-07 7:19:1254 days 15 hrs ago0x808c123c3ccd97dff012878d0affbf11bf01c069 IN  Degenerated: High Flyers0 Ether0.00032568 7.06282446
0xd41b6016ab5d59bac7f8b83001690ff3a788756ce7c334b667f7870874d80470Set Approval For...152113852022-07-25 11:25:4367 days 11 hrs ago0xfa3447488295d2422a0619e6d296df0a5ef4df66 IN  Degenerated: High Flyers0 Ether0.0008935 19.37643831
0xe8be90ba785a794034788e00732a6f1ec5645d5821e9ac1008141216089cb4f5Set Approval For...151466292022-07-15 10:07:5577 days 12 hrs ago0x80e66be5df1b6d2bee6a3652e1854c68850ed9ff IN  Degenerated: High Flyers0 Ether0.00024462 10.07297124
0x37d00ebbf566757439e2fc6a09d19b228b5ae16ed2a306f86b01d47c19f601b6Set Approval For...151402882022-07-14 10:40:4378 days 11 hrs ago0xeba8c66a090043edb92c8344f7ac9adc434054eb IN  Degenerated: High Flyers0 Ether0.00030139 12.41057062
0xae18a79038348cd867260f75707ed0e5096613e79d517fad77ad08faf6349debSet Approval For...151054702022-07-09 1:26:2483 days 21 hrs ago0x45f136d5bc17bbcb7aaff759737d75928f7ebd89 IN  Degenerated: High Flyers0 Ether0.00063378 13.74425668
0x0d6a285597479905ce653ca5ac66759ad9d6026cbc501e9bd5340c7eb3f6f14aSet Approval For...150383692022-06-28 6:33:3394 days 16 hrs agoENS Name aussie533.eth IN  Degenerated: High Flyers0 Ether0.0018369139.83502706
0xb609556de39e9804c19954ee415afffeda8e24117995d61d39ee7939950245aeSet Approval For...150176902022-06-24 9:50:5898 days 12 hrs ago0x2b1105d4e63fb9750b9c1b70cf5f64f2ab73db2f IN  Degenerated: High Flyers0 Ether0.00107284 23.2656327
0xdfb563793d9c57f362720132945f0039304c9fd3c9e37529d9a86cf228f46072Set Approval For...150096372022-06-22 21:29:25100 days 1 hr ago0xbc75767e2c23fc834379c4599067dbe3174fe5f4 IN  Degenerated: High Flyers0 Ether0.00078334 32.25637039
0xe67f8778ec45dfa00f86834774d1c07c39e227cdfe132fa0ae3bd13b8e064157Set Approval For...149998752022-06-21 1:57:22101 days 20 hrs agoENS Name kezki.eth IN  Degenerated: High Flyers0 Ether0.00128933 27.96043874
0x6add77e55445ebf104af35787755c83880c6456f63560b4faa7933f54dfc0c36Set Approval For...149903512022-06-19 10:39:04103 days 11 hrs ago0x3059f2d440999d519ef10c061c3321f4a63136a9 IN  Degenerated: High Flyers0 Ether0.00097119 21.06116969
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0xcb4d2b2e9302cfe48f1d8a9c2617fd4d0296f1d9e2dcaf74d39263d8280a298d130905542021-08-24 21:35:36402 days 1 hr ago Degenerated: High FlyersHigh Flyers: Deployer107.09888 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
Highflyers

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
Yes with 500 runs

Other Settings:
default evmVersion
File 1 of 11 : Highflyers.sol
// Highflyers.sol
//
// degenerated.io // 2021 // [email protected]
//
// SPDX-License-Identifier: MIT
// if you're looking to reuse this contract and have any questions, just lmk

pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

contract Highflyers is ERC721 {

    // counters is a safe way of counting that can only be +/- by one
    // https://docs.openzeppelin.com/contracts/4.x/api/utils#Counters
    using Counters for Counters.Counter;
    Counters.Counter private _tokensIssuedCounter;

    // traditionally we'd include SafeMath here, but safemath is no longer necessary in solidity 0.8.0+
    // https://docs.openzeppelin.com/contracts/4.x/api/utils
    // using SafeMath for uint256;

    uint256 private constant MAX_TOKENS = 6969;
    uint256 private constant MAX_MINTABLE_AT_ONCE = 20; // total tokens, so 10 pair

    // this pricing scheme is degenerate ;)
    // pricing equation is: 0.015E + 0.027E * num_pairs, which results in
    //    1 = (0.015 + 0.027 * 1) = 0.0420
    //    2 = (0.015 + 0.027 * 2) = 0.0690
    //    n = (0.015 + 0.027 * n) = (etc)
    // hehehehe
    uint256 private constant BASE_PRICE_PER_MINT = 15 * 10**15; // .027,000,000,000,000,000 eth in wei
    uint256 private constant PRICE_PER_PAIR = 27 * 10**15; // .027,000,000,000,000,000 eth in wei
    uint256 private constant TOKENS_PER_PAIR = 2; // derp

    // these are private because we write getters for them, no need to make them readable as-is
    string private _baseTokenURI;
    bool private _contractIsPaused;
    address private _ownerAddress;

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // core contract logic

    constructor() ERC721("Highflyers", "HIGHFLYERS") {

        _baseTokenURI = "https://degenerated.io/nft/highflyer/";
        _ownerAddress = msg.sender; // deployer is permanent owner
        _contractIsPaused = false;

        // mint the first three tokens to the contract owner
        // (1) we have an odd number of tokens but mint in pairs, so an odd offset is necessary
        // (2) these tokens don't want to be alone, so can't mint just one
        // (3) we'll save these for a special giveaway
        _mintWithChecks(_ownerAddress, 3);

        // after initial mint, ensure we deploy as paused
        _contractIsPaused = true;

    }

    // fyi: this used to have address mintAddress as an argument, but instead, we opted to simplify this function and
    // just mandate that the minted tokens are deposited back into the account that is paying for the mint (msg.sender)
    function mint(uint256 numberOfPairsToMint) public payable {

        // this is the public mint function, so check two things:
        // (1) require contract is not paused
        // (2) that the message contains enough ETH to perform the mint
        require(!_contractIsPaused, "Yo, can't mint while paused");
        require(msg.value >= (BASE_PRICE_PER_MINT + (numberOfPairsToMint * PRICE_PER_PAIR)),
            "Yo, you gotta pay at least the minimum"
        );

        // mint
        _mintWithChecks(msg.sender, numberOfPairsToMint * TOKENS_PER_PAIR);

    }

    // the contract-specific function called by both ownerMintAirdrop() and public payable mint()
    //
    // IMPORTANT: this function takes the ACTUAL number of tokens to mint, notably, it is not aware of any pair minting
    // so the mint() and ownerMintAirdrop() functions MUST do the *2 adjustment in their own functions to mint pairs
    function _mintWithChecks(address mintAddress, uint256 numberOfTokensToMint) internal {

        require(numberOfTokensToMint <= MAX_MINTABLE_AT_ONCE, "Yo, can't mint that many at once");

        for (uint256 mt = 0; mt < numberOfTokensToMint; mt++) {

            // check within the loop to protect against reentrancy
            require(getIssuedTokenCount() < MAX_TOKENS, "Yo, can't mint more than is available");

            // increment before minting: starts token ids at 1 instead of 0 (which is desired)
            // also follows checks-effects-interactions pattern
            _tokensIssuedCounter.increment();

            // use _mint here instead of _safeMint, since _safeMint allows reentrancy into the mint function from the
            // onERC721Received receiver in the remote contract. using _mint means you could mint to a contract address
            // that doesn't accept ERC721 tokens, but if someone mints to a non-ERC721 accepting address, that's on them
            _mint(mintAddress, getIssuedTokenCount());
        }

    }

    // override the _beforeTokenTransfer hook to check our local paused variable
    function _beforeTokenTransfer(address from, address to, uint256 tokenId) internal override {

        require(!_contractIsPaused, "Yo, can't transfer a token when the contract is paused");
        super._beforeTokenTransfer(from, to, tokenId);

    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // simple getters

    // this overrides the inherited _baseURI(), which is used to construct the token uri. honestly, this seems like a
    // weird way to do this but seems to be a good solution without making the entire contract inherit ERC721URIStorage
    function _baseURI() internal override view returns (string memory) {
        return _baseTokenURI;
    }

    function getIssuedTokenCount() public view returns (uint256) {
        return _tokensIssuedCounter.current();
    }

    function getContractIsPaused() public view returns (bool) {
        return _contractIsPaused;
    }

    // this is necessary to be able to edit the collection on opensea; it's a simple way to enable this functionality
    // without making the entire contract inherit ERC721Ownable, which has a bunch of functions we don't need
    function owner() public view returns (address) {
        return _ownerAddress;
    }

    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // owner management functions

    modifier ownerOnlyACL() {
        require(msg.sender == _ownerAddress, "Yo, have to be the owner to call this");
        _;
    }

    // set a new base token URI, in case metadata/image provider changes
    function ownerSetBaseTokenURI(string memory newBaseTokenURI) public ownerOnlyACL {
        _baseTokenURI = newBaseTokenURI;
    }

    // set paused state
    function ownerSetPausedState(bool contractIsPaused) public ownerOnlyACL {
        _contractIsPaused = contractIsPaused;
    }

    // owner manual mint (airdrop) ability, for free, regardless if contract is paused or not
    function ownerMintAirdrop(address mintAddress, uint256 numberOfPairsToMint) public ownerOnlyACL {

        bool tempContractIsPaused = _contractIsPaused;
        _contractIsPaused = false;

        _mintWithChecks(mintAddress, numberOfPairsToMint * TOKENS_PER_PAIR);

        _contractIsPaused = tempContractIsPaused;

    }

    // simplified withdraw function callable by only the owner that withdraws to the owner address. there are no
    // internal state changes here, and it can only be called by owner, so this should(?) be safe from reentrancy
    function ownerWithdrawContractBalance() public ownerOnlyACL {

        uint256 balance = address(this).balance;
        require(balance > 0, "Yo, don't waste your gas trying to withdraw a zero balance");

        // withdraw
        (bool withdrawSuccess, ) = msg.sender.call{value: balance}("");

        // this should never happen? but including in case so all state is reverted
        require(withdrawSuccess, "Yo, withdraw failed, reverting");

    }

}

File 2 of 11 : ERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.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 ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings 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.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).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 = ERC721.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 = ERC721.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 = ERC721.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(ERC721.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(ERC721.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 IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, _data) returns (bytes4 retval) {
                return retval == IERC721Receiver.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 {}
}

File 3 of 11 : Counters.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

    function increment(Counter storage counter) internal {
        unchecked {
            counter._value += 1;
        }
    }

    function decrement(Counter storage counter) internal {
        uint256 value = counter._value;
        require(value > 0, "Counter: decrement overflow");
        unchecked {
            counter._value = value - 1;
        }
    }

    function reset(Counter storage counter) internal {
        counter._value = 0;
    }
}

File 4 of 11 : IERC721.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @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 5 of 11 : IERC721Receiver.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 IERC721Receiver {
    /**
     * @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 6 of 11 : IERC721Metadata.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "../IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Metadata is IERC721 {
    /**
     * @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 7 of 11 : Address.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

File 8 of 11 : Context.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

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

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 9 of 11 : Strings.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

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

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

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

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

File 10 of 11 : ERC165.sol
// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

File 11 of 11 : IERC165.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 IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 500
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"approved","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"operator","type":"address"},{"indexed":false,"internalType":"bool","name":"approved","type":"bool"}],"name":"ApprovalForAll","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getContractIsPaused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getIssuedTokenCount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"numberOfPairsToMint","type":"uint256"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"mintAddress","type":"address"},{"internalType":"uint256","name":"numberOfPairsToMint","type":"uint256"}],"name":"ownerMintAirdrop","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"newBaseTokenURI","type":"string"}],"name":"ownerSetBaseTokenURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bool","name":"contractIsPaused","type":"bool"}],"name":"ownerSetPausedState","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"ownerWithdrawContractBalance","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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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.