Mumbai Testnet

Contract

0x2bB46b998013Bc7dc0A96De6E7DC1367f8EfddFf

Overview

MATIC Balance

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Transaction Hash
Method
Block
From
To
Value
Burn Soulbound C...271999412022-07-16 16:11:44620 days ago1657987904IN
0x2bB46b99...7f8EfddFf
0 MATIC0.0027428129.15159953
Send Soulbound C...271957662022-07-16 8:14:43621 days ago1657959283IN
0x2bB46b99...7f8EfddFf
0 MATIC0.00140179.01257955
Send Soulbound C...271891012022-07-15 20:11:42621 days ago1657915902IN
0x2bB46b99...7f8EfddFf
0 MATIC0.00060883.91446478
Send Soulbound C...271890732022-07-15 20:09:22621 days ago1657915762IN
0x2bB46b99...7f8EfddFf
0 MATIC0.001146487.37159107
Burn Soulbound C...271889022022-07-15 19:49:44621 days ago1657914584IN
0x2bB46b99...7f8EfddFf
0 MATIC0.0014580832.00650348
Send Soulbound C...271887842022-07-15 19:38:37621 days ago1657913917IN
0x2bB46b99...7f8EfddFf
0 MATIC0.0052371333.67329211
Send Soulbound C...271885132022-07-15 19:09:23621 days ago1657912163IN
0x2bB46b99...7f8EfddFf
0 MATIC0.0063766440.99998712
Send Soulbound C...271867702022-07-15 16:08:51621 days ago1657901331IN
0x2bB46b99...7f8EfddFf
0 MATIC0.0077863845.105
Send Soulbound C...271853492022-07-15 13:48:11622 days ago1657892891IN
0x2bB46b99...7f8EfddFf
0 MATIC0.0056368136.24306485
Send Soulbound C...271853472022-07-15 13:48:01622 days ago1657892881IN
0x2bB46b99...7f8EfddFf
0 MATIC0.0062253736.06237021
0x60806040271852952022-07-15 13:43:40622 days ago1657892620IN
 Create: SoulboundCard
0 MATIC0.1431383943.56475001

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Contract Source Code Verified (Exact Match)

Contract Name:
SoulboundCard

Compiler Version
v0.8.4+commit.c7e474f2

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity Multiple files format)

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

pragma solidity ^0.8.0;

import "./BusinessCard.sol";
import "./Ownable.sol";
import "./IERC721.sol";
import "./IERC721Enumerable.sol";
import "./IERC721Metadata.sol";
import "./Address.sol";
import "./Strings.sol";
import "./ERC165Storage.sol";
import "./SafeMath.sol";
import "./EnumerableSet.sol";

contract SoulboundCard is ERC165Storage, IERC721, IERC721Metadata, IERC721Enumerable, Ownable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableSet for EnumerableSet.AddressSet;
    using Strings for uint256;

    // Mapping from address to their (enumerable) set of received Soulbound Cards
    mapping (address => EnumerableSet.UintSet) private _receivedTokens;

    // Mapping from token IDs to their (enumerable) set of receiver addresses
    mapping (uint256 => EnumerableSet.AddressSet) private _tokenReceivers;

    // Mapping of addresses that have blakclisted the receiving of Soulbound Cards
    mapping (address => bool) private _blacklistedReceivers;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Main Business Card smart contract
    BusinessCard bCard;

    constructor (string memory name_, string memory symbol_, address _bCard) {

        _name = name_;
        _symbol = symbol_;
        bCard = BusinessCard(_bCard);

        // register the supported interfaces to conform to ERC721 via ERC165
        /*
        *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
        *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
        *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
        *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
        *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
        *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
        *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
        *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
        *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
        *
        *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
        *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
        */
        _registerInterface(0x80ac58cd);

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

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

    /**
     * @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 Sends a copy of the Business Card specified by tokenId as a Soulbound Card to the
     * specified address
     */
    function sendSoulboundCard(address from, address receiver, uint256 tokenId) external {
        require(_isApprovedOrOwner(msg.sender, tokenId), "SCARD: caller is not owner nor approved");
        require(bCard.ownerOf(tokenId) == from, "SCARD: sending card that is not own");
        require(receiver != address(0), "SCARD: sending to zero address");
        require(receiver != from, "SCARD: sending to owner");
        require(!_blacklistedReceivers[receiver], "SCARD: receiver blacklisted themselves");
        require(!_receivedTokens[receiver].contains(tokenId), "SCARD: receiver was already sent the Soulbound Card");

        _receivedTokens[receiver].add(tokenId);
        _tokenReceivers[tokenId].add(receiver);

        emit Transfer(from, receiver, tokenId);
    }

    /**
     * @dev Burns a specific Soulbound Card that was sent to msg.sender
     */
    function burnSoulboundCard(address receiver, uint256 toBurn) external {
        require(
            msg.sender == receiver || _isApprovedOrOwner(msg.sender, toBurn),
            "SCARD: caller is not owner nor approved"   
        );
        require(_receivedTokens[receiver].contains(toBurn), "SCARD: token not in receiver's list");
        _burnSoulboundCard(receiver, toBurn);
    }

    /**
     * @dev Burns a specific Soulbound Card that was sent to msg.sender
     */
    function _burnSoulboundCard(address receiver, uint256 toBurn) internal {
        require(
            // Remove the Soulbound Card from the set of tokens address `receiver` received
            _receivedTokens[receiver].remove(toBurn)
            &&
            // Remove the address `receiver` from the set of receivers for the Soulbound Card `tokenId`
            _tokenReceivers[toBurn].remove(receiver)
            ,
            "SCARD: token not on the set"
        );
        
        emit Transfer(receiver, address(0), toBurn);
    }

    /**
     * @dev Burns the specified Soulbound Cards associated with a Business Card `tokenId`
     */
    function burnSoulboundCardsOfToken(uint256 tokenId, address[] calldata toBurn) external { 
        require(
            msg.sender == address(bCard) || _isApprovedOrOwner(msg.sender, tokenId),
            "SCARD: caller is not BCARD contract nor owner nor approved"   
        );
        // To clean an EnumerableSet, we remove all elements one by one
        for (uint256 i = 0; i < toBurn.length; i++) {
            address receiver = toBurn[i];
            _burnSoulboundCard(receiver, tokenId);
        }
    }
    
    /**
     * @dev Burns the specified Soulbound Cards associated with a Business Card `tokenId`
     */
    function burnAllSoulboundCardsOfToken(uint256 tokenId) external { 
        require(
            msg.sender == address(bCard) || _isApprovedOrOwner(msg.sender, tokenId),
            "SCARD: caller is not BCARD contract nor owner nor approved"   
        );
        // To clean an EnumerableSet, we remove all elements one by one
        address[] memory toBurn = _tokenReceivers[tokenId].values();
        for (uint256 i = 0; i < toBurn.length; i++) {
            address receiver = toBurn[i];
            _burnSoulboundCard(receiver, tokenId);
        }
    }
    

    /**
     * @dev Burns all the Soulbound Cards that were sent to the specified address `toDisable`
     * Caller must be the specified address or an approved operator
     */
    function burnReceivedSoulboundCards(address receiver, uint256[] calldata toBurn) external {
        require(
            msg.sender == receiver || isApprovedForAll(receiver, msg.sender)
            , 
            "SCARD: caller is not receiver nor approved for all"
        );
        // To clean an EnumerableSet, we remove all elements one by one
        for (uint256 i = 0; i < toBurn.length; ++i) {
            uint256 cardId = toBurn[i];
            _burnSoulboundCard(receiver, cardId);
        }
    }

    /**
     * @dev Blacklists the specified address from receiving any additional sCards
     * Caller must be the specified address or an approved operator
     */
    function disableSoulboundCardsForAddress(address toDisable) external {
        require(msg.sender == toDisable || isApprovedForAll(toDisable, msg.sender), "SCARD: caller is not owner nor approved for all");
        _blacklistedReceivers[toDisable] = true;
    }

    /**
     * @dev Returns if address `receiver` is blacklisted from getting Soulbound Cards 
     */
    function isBlacklisted(address receiver) external view returns (bool blacklisted) {
        blacklisted = _blacklistedReceivers[receiver];
    }

    /**
     * @dev Returns the Soulbound Card tokenURI, which is linked to the Business Card tokenURI
     */
    function tokenURI(uint256 tokenId) external view override returns (string memory) {
        return bCard.tokenURI(tokenId);
    }
    
    /**
     * @dev See {IERC721-ownerOf}.
     *
     * Here owner represents ownership of the original Business Card
     */
    function ownerOf(uint256 _tokenId) public view virtual override returns (address) {
        return bCard.ownerOf(_tokenId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     *
     * Returns the number of Soulbound Cards received by an address
     */
    function balanceOf(address _owner) public view virtual override returns (uint256) {
        require(_owner != address(0), "ERC721: balance query for the zero address");
        return _receivedTokens[_owner].length();
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     *
     * The `totalSupply` is defined as the number of Soulbound Cards that have been sent
     */
    function totalSupply() public view virtual override returns (uint256 count) {
        uint256 nTokens = bCard.totalSupply();
        for (uint256 i = 1; i <= nTokens; ++i) {
            count += _tokenReceivers[i].length();
        }
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     *
     * Returns the Soulbound Card received by an address at a given index
     */
    function tokenOfOwnerByIndex(address _owner, uint256 index) public view virtual override returns (uint256) {
        require(index < balanceOf(_owner), "Index out of bounds");
        return _receivedTokens[_owner].at(index);
    }

    /**
     * @dev Returns the list of addresses that received a copy of a given `tokenId` Business Card
     * as a Soulbound Card
     */
    function soulboundCardReceivers(uint256 tokenId) public view returns (address[] memory) {
        return _tokenReceivers[tokenId].values();
    }

    /**
     * @dev Returns the list of Soulbound Cards that an address `receiver` got
     */
    function receivedSoulboundCards(address receiver) public view returns (uint256[] memory) {
        return _receivedTokens[receiver].values();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     *
     * Returns the corresponding Business Card by index
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        return bCard.tokenByIndex(index);
    }

    /**
     * @dev See {IERC721-approve}.
     *
     * Only present to be ERC721 compliant. Soulbound Cards cannot be approved for spending
     * as they are not transferable. Granting the corresponding Business Card approval for
     * spending also allows them to send Soulbound Cards.
     */
    function approve(address /* _approved */, uint256 /* _tokenId */) public pure virtual override {
        revert("SCARD: cannot approve Soulbound Cards");
    }

    /**
     * @dev See {IERC721-getApproved}.
     *
     * Returns the address that is approved to spend the BusinessCard `tokenId`.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        return bCard.getApproved(tokenId);
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     *
     * Only present to be ERC721 compliant. Soulbound Cards cannot be approved for spending
     * as they are not transferable. Granting the corresponding Business Card approval for
     * spending also allows them to send Soulbound Cards.
     */
    function setApprovalForAll(address /* _operator */, bool /* _approved */) public pure virtual override {
        revert("SCARD: cannot approve Soulbound Cards");
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     *
     * Returns if an address is approved to spend any of the `owner`'s Business Cards.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return bCard.isApprovedForAll(owner, operator);
    }

    /**
     * @dev See {IERC721-transferFrom}.
     *
     * Only present to be ERC721 compliant. Soulbound Cards cannot be transferred. They can
     * be sent by the Business Card owner or approved address, and can be burned by either
     * the recipient or Business Card owner or approved address.
     */
    function transferFrom(address /* from */, address /* to */, uint256 /* tokenId */) public pure virtual override {
        revert("SCARD: cannot transfer Soulbound Cards");
    }

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

    /**
     * @dev See {IERC721-safeTransferFrom}.
     *
     * Only present to be ERC721 compliant. Soulbound Cards cannot be transferred. They can
     * be sent by the Business Card owner or approved address, and can be burned by either
     * the recipient or Business Card owner or approved address.
     */
    function safeTransferFrom(address /* from */, address /* to */, uint256 /* tokenId */, bytes memory /* _data */) public pure virtual override {
        revert("SCARD: cannot transfer Soulbound Cards");
    }

    /**
     * @dev Returns whether `spender` is allowed to manage the BusinessCard `tokenId`.
     *
     * Requirements:
     *
     * - A Business Card by `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = bCard.ownerOf(tokenId);
        return (spender == owner || bCard.getApproved(tokenId) == spender || bCard.isApprovedForAll(owner, spender));
    }
    
}

File 1 of 17: Address.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @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
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 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
                /// @solidity memory-safe-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}

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

// Because every self-respected businessman needs his business card

pragma solidity ^0.8.0;

import "./BusinessCardUtils.sol";
import "./Ownable.sol";
import "./IERC721.sol";
import "./IERC721Enumerable.sol";
import "./IERC721Metadata.sol";
import "./IERC721Receiver.sol";
import "./Address.sol";
import "./Context.sol";
import "./Strings.sol";
import "./ERC165Storage.sol";
import "./SafeMath.sol";
import "./EnumerableMap.sol";
import "./EnumerableSet.sol";

contract ISoulboundCard {

    function burnAllSoulboundCardsOfToken(uint256 tokenId) external { }

} 

/**
 * @title NFT Business Card smart contract
 * @dev compliant with https://eips.ethereum.org/EIPS/eip-721
 */
contract BusinessCard is ERC165Storage, IERC721, IERC721Metadata, IERC721Enumerable, Ownable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

    // Mapping from holder address to their (enumerable) set of owned tokens
    mapping (address => EnumerableSet.UintSet) private _holderTokens;

    // Enumerable mapping from token ids to their owners
    EnumerableMap.UintToAddressMap private _tokenOwners;

    // 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;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

    // Base URI
    string private _baseURI;

    // Public variables
    uint256 public constant maxSupply = 1111;
    bool public saleStarted;

    // Random nonce for generating genes
    uint256 private randNonce;

    struct Card {
        uint256 genes;
        string name;
    }

    // Mapping from token ID to genes
    mapping (uint256 => Card) private _tokenStats;
    // Mapping for reserved names, reserved names are stored in lowercase
    mapping (string => bool) private _nameReserved;

    // Values sent in the event when minting / updating a card
    // All the metadata attributes that do NOT get stored on chain
    struct CardProperties {
        string position;
        string twitterAccount;
        string telegramAccount;
        string telegramGroup;
        uint256 discordAccount;
        string discordGroup;
        string githubUsername;
        string website;
    }

    // Default URI
    string private _defaultURI;

    // Address of the oracle
    address private serverOracle;
    // Requests made to the NFT oracle
    mapping(uint256 => bool) public requests;

    // Marketplace address
    address private bCardMarketplace;
    // sCard address - SoulboundCards
    ISoulboundCard private sCard;

    // Token mint price
    uint256 public mintPrice = 0.1 ether;
    // Token URI update / swap price
    uint256 public updatePrice = 0.05 ether;
    // Oracle update transaction gas price
    uint256 public oraclePrice = 0.015 ether;

    // Oracle related events
    event UpdateRequest(uint256 tokenId, uint256 genes, string name, CardProperties cardProperties);
    event SwapRequest(uint256 tokenId1, uint256 tokenId2, uint256 genes1, uint256 genes2);
    event TokenURIUpdated(uint256 tokenId, string tokenURI);

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection, and defining base and default URIs.
     */
    constructor (string memory name_, string memory symbol_, string memory baseURI_, string memory defaultURI_) {
        _name = name_;
        _symbol = symbol_;
        _baseURI = baseURI_;
        _defaultURI = defaultURI_;

        // register the supported interfaces to conform to ERC721 via ERC165
        /*
        *     bytes4(keccak256('balanceOf(address)')) == 0x70a08231
        *     bytes4(keccak256('ownerOf(uint256)')) == 0x6352211e
        *     bytes4(keccak256('approve(address,uint256)')) == 0x095ea7b3
        *     bytes4(keccak256('getApproved(uint256)')) == 0x081812fc
        *     bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465
        *     bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5
        *     bytes4(keccak256('transferFrom(address,address,uint256)')) == 0x23b872dd
        *     bytes4(keccak256('safeTransferFrom(address,address,uint256)')) == 0x42842e0e
        *     bytes4(keccak256('safeTransferFrom(address,address,uint256,bytes)')) == 0xb88d4fde
        *
        *     => 0x70a08231 ^ 0x6352211e ^ 0x095ea7b3 ^ 0x081812fc ^
        *        0xa22cb465 ^ 0xe985e9c5 ^ 0x23b872dd ^ 0x42842e0e ^ 0xb88d4fde == 0x80ac58cd
        */
        _registerInterface(0x80ac58cd);

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

        /*
        *     bytes4(keccak256('totalSupply()')) == 0x18160ddd
        *     bytes4(keccak256('tokenOfOwnerByIndex(address,uint256)')) == 0x2f745c59
        *     bytes4(keccak256('tokenByIndex(uint256)')) == 0x4f6ccce7
        *
        *     => 0x18160ddd ^ 0x2f745c59 ^ 0x4f6ccce7 == 0x780e9d63
        */
        _registerInterface(0x780e9d63);
    }
    
    /**
     * @dev Sets up a new oracle that handles the dynamic aspect of the NFT
     */
    function setOracle(address _serverOracle) external onlyOwner {
        serverOracle = _serverOracle;
    }

    /**
     * @dev Sets up a Marketplace allowing the native trading of Business Cards
     */
    function setMarketplace(address _marketplace) external onlyOwner {
        bCardMarketplace = _marketplace;
    }

    /**
     * @dev Sets up the sCard address for interaction
     */
    function setSoulboundCard(address _soulbound) external onlyOwner {
        sCard = ISoulboundCard(_soulbound);
    }

    /**
     * @dev Changes the update price for the usage of the oracle
     */
    function modifyUpdatePrice(uint256 newUpdatePrice) external onlyOwner {
        require(newUpdatePrice >= oraclePrice); // dev: Update price must always cover the gas costs of running the oracle
        updatePrice = newUpdatePrice;
    }

    /**
     * @dev Calls the oracle to update a certain token URI with the newly defined Card struct
     */
    function _updateTokenURI(uint256 _tokenId, uint256 _genes, string calldata _cardName, CardProperties calldata _cardProperties) internal {
        require(BusinessCardUtils.validateOtherProperties(_cardProperties));  // Other properties are not valid
        require(_exists(_tokenId));
        // Calls for updating the token can only be made if it is not being processed already
        require(requests[_tokenId] == false, "Update being processed");
        requests[_tokenId] = true;
        // Fund the server oracle with enough funds for the updateCallback transaction
        payable(serverOracle).transfer(oraclePrice);
        // Emit event to be catched by the server oracle running off-chain
        emit UpdateRequest(_tokenId, _genes, _cardName, _cardProperties);
    }

    /**
     * @dev Updates a certain token URI and clears the corresponding update request
     * Only the assigned server oracle is allowed to call this function
     */
     function updateCallback(uint256 _tokenId, string memory _tokenURI) external {
        _callback(_tokenId, _tokenURI);
    }

    /**
     * @dev Updates a certain token URI and clears the corresponding update request
     * Only the assigned server oracle is allowed to call this function
     */
     function swapCallback(uint256 _tokenId1, uint256 _tokenId2, string memory _tokenURI1, string memory _tokenURI2) external {
        _callback(_tokenId1, _tokenURI1);
        _callback(_tokenId2, _tokenURI2);
    }

    /**
     * @dev Updates a certain token URI and clears the corresponding update request
     * Only the assigned server oracle is allowed to call this function
     */
     function _callback(uint256 _tokenId, string memory _tokenURI) internal {
        require(_msgSender() == serverOracle); // dev: Only the assigned oracle can call this function
        require(requests[_tokenId]); // dev: Request not in pending list
        _tokenURIs[_tokenId] = _tokenURI;
        delete requests[_tokenId];
        emit TokenURIUpdated(_tokenId, _tokenURI);
     }

     /**
     * @dev Mints a new NFT Business Card
     */
    function getCard(string calldata _cardName, CardProperties calldata _cardProperties) public payable {
        require(saleStarted == true);  // dev: sale not started or paused, can be managed on frontend
        require(totalSupply() < maxSupply);  // dev: sale has ended, can be managed on frontend
        require(msg.value >= mintPrice);  // dev: value sent is below the price, can be managed on frontend
        // Minting a new NFT with the name and position provided
        _safeMint(_msgSender(), totalSupply() + 1, _cardName, _cardProperties);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     d*
     * - `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, string calldata _cardName, CardProperties calldata _cardProperties) internal virtual {
        require(
            BusinessCardUtils.validateName(_cardName) &&
            isNameReserved(_cardName) == false, 
            "Name taken or not valid"
        );
        require(
            BusinessCardUtils.validatePosition(_cardProperties.position), 
            "Position not valid"
        );

        // Generating the random genes, defined by a 26 digit number
        // The server oracle will convert the genes to a string and add leading zeros, as tokenURIs are generated with this constraint
        uint256 genes = uint(keccak256(abi.encodePacked(block.timestamp, msg.sender, _cardName, randNonce))) % 10**30;
        randNonce++;
        
        // Generating a new card
        toggleReserveName(_cardName, true);
        _tokenStats[_tokenId] = Card(genes, _cardName);
        _safeMint(_to, _tokenId, abi.encodePacked(_cardName, genes));
        _updateTokenURI(_tokenId, genes, _cardName, _cardProperties);
    }

    /**
     * @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 Changes the name and/or position of a given NFT, must be owned by the caller.
     * Whenever such change is made, it is first immediately reflected in the Card struct, and in the metadata after oracle updates.
     * User can change both name and position, just the name, or just the position (by leaving those inputs empty)
     */
    function updateCard(uint256 tokenId, string calldata newName, CardProperties calldata newCardProperties) public payable {
        require(saleStarted == true);  // dev: updates paused, can be managed on frontend
        require(_isApprovedOrOwner(_msgSender(), tokenId), "Caller is not owner nor approved");
        require(
            isNameReserved(newName) == false &&
            (
                bytes(newName).length == 0 
                ||
                BusinessCardUtils.validateName(newName) == true
            )
            , 
            "Name taken or not valid"
        );
        require(
            bytes(newCardProperties.position).length == 0
            ||
            BusinessCardUtils.validatePosition(newCardProperties.position) == true
            , 
            "Position not valid"
        );
        require(
            msg.value >= updatePrice || _msgSender() == bCardMarketplace
        );  // dev: value sent is below the price, can be managed on frontend

        // Only change the name if specified
        if (bytes(newName).length > 0) {
            // De-reserve the old name
            toggleReserveName(_tokenStats[tokenId].name, false);
            // Reserve the new name
            toggleReserveName(newName, true);
            // Changing the token name
            _tokenStats[tokenId].name = newName;
        }

        // Make new tokenURI update request
        _updateTokenURI(tokenId, _tokenStats[tokenId].genes, newName, newCardProperties);
    }

    /**
     * @dev Swaps the name and position between two NFTs, must be owned by the caller.
     * This is to give customers the ability to directly shuffle name and positions of their
     * cards, and prevent possible "name snipers"
     */
    function swapCards(uint256 tokenId1, uint256 tokenId2) public payable {
        require(saleStarted == true);  // dev: updates paused, can be managed on frontend
        require(
            _isApprovedOrOwner(_msgSender(), tokenId1) &&
            _isApprovedOrOwner(_msgSender(), tokenId2), 
            "Caller is not owner nor approved"
        );
        require(msg.value >= updatePrice);  // dev: value sent is below the price, can be managed on frontend
        // Calls for updating the token can only be made if it is not being processed already
        require(requests[tokenId1] == false && requests[tokenId2] == false, "Update being processed");

        // Swapping names between tokens
        string memory name1 = _tokenStats[tokenId1].name;
        _tokenStats[tokenId1].name = _tokenStats[tokenId2].name;
        _tokenStats[tokenId2].name = name1;

        // Requests now pending
        requests[tokenId1] = true;
        requests[tokenId2] = true;

        // Emitting a single swap request to the oracle -- processed differently
        emit SwapRequest(tokenId1, tokenId2, _tokenStats[tokenId1].genes, _tokenStats[tokenId2].genes);

        // Fund the server oracle with enough funds for the swapCallback transaction
        payable(serverOracle).transfer(oraclePrice);
    }

    /**
     * @dev Updates the tokenURI, intented to be used only when oracle fails to update a tokenURI
     */
    function updateTokenURI(uint256 tokenId, string calldata cardName, CardProperties calldata _cardProperties) external onlyOwner {
        _updateTokenURI(tokenId, _tokenStats[tokenId].genes, cardName, _cardProperties);
    }

    /**
     * @dev Starts the sale, cannot do so until the oracle is defined
     */
    function startSale() external onlyOwner {
        require(serverOracle != address(0));  // dev: Oracle not defined
        saleStarted = true;
    }

    /**
     * @dev Pauses the sale
     */
    function pauseSale() external onlyOwner {
        saleStarted = false;
    }

    /**
     * @dev Returns the stats of a token
     */
    function tokenStats(uint256 tokenId) public view returns (Card memory) {
        return _tokenStats[tokenId];
    }

    /**
     * @dev Overrides the default tokenURI behaviour to include the default URI
     */
    function tokenURI(uint256 tokenId) external view override returns (string memory) {
        require(_exists(tokenId), "ERC721Metadata: URI query for nonexistent token");

        string memory token = _tokenURIs[tokenId];

        // If there is no tokenURI, returns the defaultURI, which must be defined after deployment
        if (bytes(token).length == 0) {
            return string(abi.encodePacked( baseURI(), defaultURI() ));
        } else {
            return string(abi.encodePacked( baseURI(), token ));
        }
    }

    /**
     * @dev For setting the baseURI for all tokenId's.
     */
    function setBaseURI(string memory newBaseURI) external onlyOwner {
        require(bytes(newBaseURI).length > 0);
        _baseURI = newBaseURI;
    }

    /**
    * @dev Returns the default URI set via {_setBaseURI}. This will be
    * automatically added as a prefix in {tokenURI} to each token's URI, or
    * to the token ID if no specific URI is set for that token ID.
    */
    function defaultURI() public view virtual returns (string memory) {
        return _defaultURI;
    }

    /**
     * @dev For setting the default URI for all tokenId's. 
     */
    function setDefaultURI(string calldata newDefaultURI) external onlyOwner {
        require(bytes(newDefaultURI).length > 0);  // dev: cannot be set to empty string
        _defaultURI = newDefaultURI;
    }

    /**
     * @dev Returns if the name has been reserved.
     * Name reservation checks are made in lowercase
     */
    function isNameReserved(string calldata nameString) public view returns (bool) {
        return _nameReserved[BusinessCardUtils.toLower(nameString)];
    }

    /**
     * @dev Reserves the name if isReserve is set to true, de-reserves if set to false
     * Names are reserved in lowercase, but stored in whatever case the user gave
     */
    function toggleReserveName(string memory str, bool isReserve) internal {
        _nameReserved[BusinessCardUtils.toLower(str)] = isReserve;
    }

    /**
     * @dev Withdraw balance from this contract (Callable by owner)
    */
    function withdraw() onlyOwner external {
        uint balance = address(this).balance;
        payable(msg.sender).transfer(balance);
    }

    /**
     * @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 _holderTokens[owner].length();
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        return _tokenOwners.get(tokenId, "ERC721: owner query for nonexistent token");
    }

    /**
     * @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 Returns the base URI set via {_setBaseURI}. This will be
    * automatically added as a prefix in {tokenURI} to each token's URI, or
    * to the token ID if no specific URI is set for that token ID.
    */
    function baseURI() public view virtual returns (string memory) {
        return _baseURI;
    }

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

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        // _tokenOwners are indexed by tokenIds, so .length() returns the number of tokenIds
        return _tokenOwners.length();
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < totalSupply());  // @dev: index out of bounds
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = 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}.
     *
     * If the sCard smart contract was specified, it burns all Soulbound Cards associated 
     * with the Business Card `tokenId` in the process
     */
    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, true);
    }

    /**
     * @dev Works as `transferFrom`, but will not burn the associated Soulbound Cards 
     */
    function transferFromWithoutBurn(address from, address to, uint256 tokenId) public virtual {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: transfer caller is not owner nor approved");
        _transfer(from, to, tokenId, false);
    }

    /**
     * @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, true);
        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 _tokenOwners.contains(tokenId);
    }

    /**
     * @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 = ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || isApprovedForAll(owner, spender));
    }

    /**
     * @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");

        _holderTokens[_to].add(_tokenId);

        _tokenOwners.set(_tokenId, _to);

        emit Transfer(address(0), _to, _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, bool burn) internal virtual {
        require(ownerOf(tokenId) == from, "ERC721: transfer of token that is not own"); // internal owner
        require(to != address(0), "ERC721: transfer to the zero address");

        // Burn the associated Soulbound Cards
        if (address(sCard) != address(0) && burn) {
            sCard.burnAllSoulboundCardsOfToken(tokenId);
        }

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

        _holderTokens[from].remove(tokenId);
        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

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

    /**
     * @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()) {
            return true;
        }
        bytes memory returndata = to.functionCall(abi.encodeWithSelector(
            IERC721Receiver(to).onERC721Received.selector,
            _msgSender(),
            from,
            tokenId,
            _data
        ), "ERC721: transfer to non ERC721Receiver implementer");
        bytes4 retval = abi.decode(returndata, (bytes4));
        return (retval == 0x150b7a02);
    }

}

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

pragma solidity ^0.8.0;

import "./BusinessCard.sol";

/**
 * @dev Useful functions for validating the name and position of Business Cards
 */
library BusinessCardUtils {
    /**
     * @dev Check if the name string is valid:
     * Alphanumeric and spaces without leading or trailing space, with maximum characters
     * Must contain at most one space, ensuring a Name SURNAME input.
     */
    function validateName(string calldata str) internal pure returns (bool) {
        bytes memory b = bytes(str);
        // String length requirements
        if(
            b.length == 0 || b.length > 22 || b[0] == 0x20 || b[b.length - 1] == 0x20
        ) return false;
        // Characters check
        require(validateString(str), "Non valid characters");

        // Name is validated 
        return true;
    }

    /**
     * @dev Check if the position string is valid:
     * Alphanumeric and spaces without leading or trailing space, with maximum characters
     */
    function validatePosition(string calldata str) internal pure returns (bool) {
        bytes memory b = bytes(str);
        // String length requirements
        if(
            b.length == 0 || b.length > 32 || b[0] == 0x20 || b[b.length - 1] == 0x20
        ) return false;
        // Characters check
        require(validateString(str), "Non valid characters");

        // Position is validated
        return true;
    }

    /**
     * @dev Validates that string contains valid characters, alphanumerical and some special symbols
     */
    function validateString(string calldata str) internal pure returns (bool) {
        bytes memory b = bytes(str);
        bytes1 lastChar = b[0];

        for(uint i; i<b.length; ++i){
            bytes1 char = b[i];

            if (char == 0x20 && lastChar == 0x20) return false; // Cannot contain continuous spaces

            if(
                !(char >= 0x20 && char <= 0x3F) &&  // Special characters and numbers
                !(char >= 0x41 && char <= 0x5A) &&  // A-Z
                !(char >= 0x61 && char <= 0x7A)  // a-z
            )
                return false;

            lastChar = char;
        }
        return true;
    }

    function validateOtherProperties(BusinessCard.CardProperties calldata cardProperties) internal pure returns (bool) {
        if(
            bytes(cardProperties.twitterAccount).length < 15 &&
            bytes(cardProperties.telegramAccount).length < 32 &&
            bytes(cardProperties.telegramGroup).length < 32 &&
            ((cardProperties.discordAccount >= 10**17 && cardProperties.discordAccount < 10**18) || cardProperties.discordAccount == 0) &&
            bytes(cardProperties.discordGroup).length < 32 &&
            bytes(cardProperties.githubUsername).length < 39 &&
            bytes(cardProperties.website).length < 50
        )
            return true;
        
        return false;
    }

    /**
     * @dev Converts the string to lowercase
     */
    function toLower(string memory str) internal pure returns (string memory){
        bytes memory bStr = bytes(str);
        bytes memory bLower = new bytes(bStr.length);

        for (uint i = 0; i < bStr.length; ++i) {
            // Uppercase character
            if ((uint8(bStr[i]) >= 65) && (uint8(bStr[i]) <= 90)) {
                bLower[i] = bytes1(uint8(bStr[i]) + 32);
            } else {
                bLower[i] = bStr[i];
            }
        }
        return string(bLower);
    }

}

File 4 of 17: Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

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

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

File 5 of 17: EnumerableMap.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableMap.sol)

pragma solidity ^0.8.0;

import "./EnumerableSet.sol";

/**
 * @dev Library for managing an enumerable variant of Solidity's
 * https://solidity.readthedocs.io/en/latest/types.html#mapping-types[`mapping`]
 * type.
 *
 * Maps have the following properties:
 *
 * - Entries are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Entries are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableMap for EnumerableMap.UintToAddressMap;
 *
 *     // Declare a set state variable
 *     EnumerableMap.UintToAddressMap private myMap;
 * }
 * ```
 *
 * The following map types are supported:
 *
 * - `uint256 -> address` (`UintToAddressMap`) since v3.0.0
 * - `address -> uint256` (`AddressToUintMap`) since v4.6.0
 * - `bytes32 -> bytes32` (`Bytes32ToBytes32`) since v4.6.0
 * - `uint256 -> uint256` (`UintToUintMap`) since v4.7.0
 * - `bytes32 -> uint256` (`Bytes32ToUintMap`) since v4.7.0
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableMap, you can either remove all elements one by one or create a fresh instance using an array of EnumerableMap.
 * ====
 */
library EnumerableMap {
    using EnumerableSet for EnumerableSet.Bytes32Set;

    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Map type with
    // bytes32 keys and values.
    // The Map implementation uses private functions, and user-facing
    // implementations (such as Uint256ToAddressMap) are just wrappers around
    // the underlying Map.
    // This means that we can only create new EnumerableMaps for types that fit
    // in bytes32.

    struct Bytes32ToBytes32Map {
        // Storage of keys
        EnumerableSet.Bytes32Set _keys;
        mapping(bytes32 => bytes32) _values;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        Bytes32ToBytes32Map storage map,
        bytes32 key,
        bytes32 value
    ) internal returns (bool) {
        map._values[key] = value;
        return map._keys.add(key);
    }

    /**
     * @dev Removes a key-value pair from a map. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(Bytes32ToBytes32Map storage map, bytes32 key) internal returns (bool) {
        delete map._values[key];
        return map._keys.remove(key);
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(Bytes32ToBytes32Map storage map, bytes32 key) internal view returns (bool) {
        return map._keys.contains(key);
    }

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function length(Bytes32ToBytes32Map storage map) internal view returns (uint256) {
        return map._keys.length();
    }

    /**
     * @dev Returns the key-value pair stored at position `index` in the map. O(1).
     *
     * Note that there are no guarantees on the ordering of entries inside the
     * array, and it may change when more entries are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32ToBytes32Map storage map, uint256 index) internal view returns (bytes32, bytes32) {
        bytes32 key = map._keys.at(index);
        return (key, map._values[key]);
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function tryGet(Bytes32ToBytes32Map storage map, bytes32 key) internal view returns (bool, bytes32) {
        bytes32 value = map._values[key];
        if (value == bytes32(0)) {
            return (contains(map, key), bytes32(0));
        } else {
            return (true, value);
        }
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(Bytes32ToBytes32Map storage map, bytes32 key) internal view returns (bytes32) {
        bytes32 value = map._values[key];
        require(value != 0 || contains(map, key), "EnumerableMap: nonexistent key");
        return value;
    }

    /**
     * @dev Same as {_get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {_tryGet}.
     */
    function get(
        Bytes32ToBytes32Map storage map,
        bytes32 key,
        string memory errorMessage
    ) internal view returns (bytes32) {
        bytes32 value = map._values[key];
        require(value != 0 || contains(map, key), errorMessage);
        return value;
    }

    // UintToUintMap

    struct UintToUintMap {
        Bytes32ToBytes32Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        UintToUintMap storage map,
        uint256 key,
        uint256 value
    ) internal returns (bool) {
        return set(map._inner, bytes32(key), bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToUintMap storage map, uint256 key) internal returns (bool) {
        return remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToUintMap storage map, uint256 key) internal view returns (bool) {
        return contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToUintMap storage map) internal view returns (uint256) {
        return length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintToUintMap storage map, uint256 index) internal view returns (uint256, uint256) {
        (bytes32 key, bytes32 value) = at(map._inner, index);
        return (uint256(key), uint256(value));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function tryGet(UintToUintMap storage map, uint256 key) internal view returns (bool, uint256) {
        (bool success, bytes32 value) = tryGet(map._inner, bytes32(key));
        return (success, uint256(value));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToUintMap storage map, uint256 key) internal view returns (uint256) {
        return uint256(get(map._inner, bytes32(key)));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(
        UintToUintMap storage map,
        uint256 key,
        string memory errorMessage
    ) internal view returns (uint256) {
        return uint256(get(map._inner, bytes32(key), errorMessage));
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Bytes32ToBytes32Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        UintToAddressMap storage map,
        uint256 key,
        address value
    ) internal returns (bool) {
        return set(map._inner, bytes32(key), bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(UintToAddressMap storage map, uint256 key) internal returns (bool) {
        return remove(map._inner, bytes32(key));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(UintToAddressMap storage map, uint256 key) internal view returns (bool) {
        return contains(map._inner, bytes32(key));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(UintToAddressMap storage map) internal view returns (uint256) {
        return length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintToAddressMap storage map, uint256 index) internal view returns (uint256, address) {
        (bytes32 key, bytes32 value) = at(map._inner, index);
        return (uint256(key), address(uint160(uint256(value))));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     *
     * _Available since v3.4._
     */
    function tryGet(UintToAddressMap storage map, uint256 key) internal view returns (bool, address) {
        (bool success, bytes32 value) = tryGet(map._inner, bytes32(key));
        return (success, address(uint160(uint256(value))));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(UintToAddressMap storage map, uint256 key) internal view returns (address) {
        return address(uint160(uint256(get(map._inner, bytes32(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(
        UintToAddressMap storage map,
        uint256 key,
        string memory errorMessage
    ) internal view returns (address) {
        return address(uint160(uint256(get(map._inner, bytes32(key), errorMessage))));
    }

    // AddressToUintMap

    struct AddressToUintMap {
        Bytes32ToBytes32Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        AddressToUintMap storage map,
        address key,
        uint256 value
    ) internal returns (bool) {
        return set(map._inner, bytes32(uint256(uint160(key))), bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(AddressToUintMap storage map, address key) internal returns (bool) {
        return remove(map._inner, bytes32(uint256(uint160(key))));
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(AddressToUintMap storage map, address key) internal view returns (bool) {
        return contains(map._inner, bytes32(uint256(uint160(key))));
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(AddressToUintMap storage map) internal view returns (uint256) {
        return length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressToUintMap storage map, uint256 index) internal view returns (address, uint256) {
        (bytes32 key, bytes32 value) = at(map._inner, index);
        return (address(uint160(uint256(key))), uint256(value));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function tryGet(AddressToUintMap storage map, address key) internal view returns (bool, uint256) {
        (bool success, bytes32 value) = tryGet(map._inner, bytes32(uint256(uint160(key))));
        return (success, uint256(value));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(AddressToUintMap storage map, address key) internal view returns (uint256) {
        return uint256(get(map._inner, bytes32(uint256(uint160(key)))));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(
        AddressToUintMap storage map,
        address key,
        string memory errorMessage
    ) internal view returns (uint256) {
        return uint256(get(map._inner, bytes32(uint256(uint160(key))), errorMessage));
    }

    // Bytes32ToUintMap

    struct Bytes32ToUintMap {
        Bytes32ToBytes32Map _inner;
    }

    /**
     * @dev Adds a key-value pair to a map, or updates the value for an existing
     * key. O(1).
     *
     * Returns true if the key was added to the map, that is if it was not
     * already present.
     */
    function set(
        Bytes32ToUintMap storage map,
        bytes32 key,
        uint256 value
    ) internal returns (bool) {
        return set(map._inner, key, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the key was removed from the map, that is if it was present.
     */
    function remove(Bytes32ToUintMap storage map, bytes32 key) internal returns (bool) {
        return remove(map._inner, key);
    }

    /**
     * @dev Returns true if the key is in the map. O(1).
     */
    function contains(Bytes32ToUintMap storage map, bytes32 key) internal view returns (bool) {
        return contains(map._inner, key);
    }

    /**
     * @dev Returns the number of elements in the map. O(1).
     */
    function length(Bytes32ToUintMap storage map) internal view returns (uint256) {
        return length(map._inner);
    }

    /**
     * @dev Returns the element stored at position `index` in the set. O(1).
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32ToUintMap storage map, uint256 index) internal view returns (bytes32, uint256) {
        (bytes32 key, bytes32 value) = at(map._inner, index);
        return (key, uint256(value));
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function tryGet(Bytes32ToUintMap storage map, bytes32 key) internal view returns (bool, uint256) {
        (bool success, bytes32 value) = tryGet(map._inner, key);
        return (success, uint256(value));
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function get(Bytes32ToUintMap storage map, bytes32 key) internal view returns (uint256) {
        return uint256(get(map._inner, key));
    }

    /**
     * @dev Same as {get}, with a custom error message when `key` is not in the map.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryGet}.
     */
    function get(
        Bytes32ToUintMap storage map,
        bytes32 key,
        string memory errorMessage
    ) internal view returns (uint256) {
        return uint256(get(map._inner, key, errorMessage));
    }
}

File 6 of 17: EnumerableSet.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/structs/EnumerableSet.sol)

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 *  Trying to delete such a structure from storage will likely result in data corruption, rendering the structure unusable.
 *  See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 *  In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        return _values(set._inner);
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

File 7 of 17: ERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

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

File 8 of 17: ERC165Storage.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165Storage.sol)

pragma solidity ^0.8.0;

import "./ERC165.sol";

/**
 * @dev Storage based implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165Storage is ERC165 {
    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return super.supportsInterface(interfaceId) || _supportedInterfaces[interfaceId];
    }

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

File 9 of 17: IERC165.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 10 of 17: IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "./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`.
     *
     * 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;

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

    /**
     * @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);
}

File 11 of 17: IERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721Enumerable is IERC721 {
    /**
     * @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);

    /**
     * @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);
}

File 12 of 17: IERC721Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/IERC721Metadata.sol)

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 13 of 17: IERC721Receiver.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC721/IERC721Receiver.sol)

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 `IERC721Receiver.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

File 14 of 17: Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "./Context.sol";

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

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

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

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

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

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

File 15 of 17: SafeMath.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

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

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

    /**
     * @dev Returns the subtraction 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 17 of 17: Strings.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @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);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

Contract ABI

[{"inputs":[{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"},{"internalType":"address","name":"_bCard","type":"address"}],"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":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","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":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"pure","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":"burnAllSoulboundCardsOfToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256[]","name":"toBurn","type":"uint256[]"}],"name":"burnReceivedSoulboundCards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"toBurn","type":"uint256"}],"name":"burnSoulboundCard","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"address[]","name":"toBurn","type":"address[]"}],"name":"burnSoulboundCardsOfToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"toDisable","type":"address"}],"name":"disableSoulboundCardsForAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"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":"address","name":"receiver","type":"address"}],"name":"isBlacklisted","outputs":[{"internalType":"bool","name":"blacklisted","type":"bool"}],"stateMutability":"view","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":"uint256","name":"_tokenId","type":"uint256"}],"name":"ownerOf","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"receiver","type":"address"}],"name":"receivedSoulboundCards","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","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":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"sendSoulboundCard","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"bool","name":"","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"soulboundCardReceivers","outputs":[{"internalType":"address[]","name":"","type":"address[]"}],"stateMutability":"view","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":"index","type":"uint256"}],"name":"tokenByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"},{"internalType":"uint256","name":"index","type":"uint256"}],"name":"tokenOfOwnerByIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"tokenURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"count","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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

000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000384c8072da488698df87c02cdf04499262d4697f000000000000000000000000000000000000000000000000000000000000000e536f756c626f756e64204361726400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000055343415244000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : name_ (string): Soulbound Card
Arg [1] : symbol_ (string): SCARD
Arg [2] : _bCard (address): 0x384c8072DA488698Df87c02cDf04499262D4697f

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000060
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 000000000000000000000000384c8072da488698df87c02cdf04499262d4697f
Arg [3] : 000000000000000000000000000000000000000000000000000000000000000e
Arg [4] : 536f756c626f756e642043617264000000000000000000000000000000000000
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000005
Arg [6] : 5343415244000000000000000000000000000000000000000000000000000000


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://31628b23795ebcc7aee1a200d8f4a4c3f997784b255f55f068073ba235c5f14a

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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Txn Hash Block Value Eth2 PubKey Valid
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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.