Contract 0x8332717a53b73adb5897f473f54384956787a978 14

 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xb928d09e084c8f4091f170eb89de09364829e16869fe840545e76ad6b51a696fStake2045614822024-04-25 4:34:2254 mins ago0x6b73f2b5ddf22a3e190893bbd83e2f0a882a7dac IN  Yieldification: sYDF Token0 ETH0.00000473 0.01
0xfcec8d912077f7586bb61c6bc617ee1f11625365e8a0f6fed4d1a6fd66682311Unstake2045576632024-04-25 4:18:101 hr 10 mins ago0x6b73f2b5ddf22a3e190893bbd83e2f0a882a7dac IN  Yieldification: sYDF Token0 ETH0.00000565 0.017797
0x58e261c42c6ac79bf613bcb8044e34d3917855bf84427b2287a13034abf2706eClaim And Vest R...2043341582024-04-24 12:20:4417 hrs 8 mins ago0x6b73f2b5ddf22a3e190893bbd83e2f0a882a7dac IN  Yieldification: sYDF Token0 ETH0.00000281 0.01
0x73255744702f246ec617e988ef13765f3c2675464d2a17aa27c302f471fce493Claim And Vest R...2035716762024-04-22 6:31:442 days 22 hrs ago0x4f69cc4b9876463920525fa8311807524a89c3c2 IN  Yieldification: sYDF Token0 ETH0.000002 0.01
0x07f6c48315f96b4bc3c06c13fff847b1d812a83f44477e5af1af2586f06a4aedStake2035715582024-04-22 6:31:142 days 22 hrs ago0x4f69cc4b9876463920525fa8311807524a89c3c2 IN  Yieldification: sYDF Token0 ETH0.00000467 0.01
0xf6b79bff0dfe801f1be67cb56aaa7654f483fb988aa00e6d99806e665760f4fcUnstake2032785542024-04-21 9:59:433 days 19 hrs ago0x211158c882a2ec76e6204c9fb777fe0f39c83b9e IN  Yieldification: sYDF Token0 ETH0.00000289 0.01
0x2b2d65c1056fc22f1dd4979255f43f1543bd2a8f2ec3be61b726c06cb3ca3733Unstake2032784142024-04-21 9:59:083 days 19 hrs ago0x211158c882a2ec76e6204c9fb777fe0f39c83b9e IN  Yieldification: sYDF Token0 ETH0.00000307 0.01
0x2425ed9fab372892d6be47b5d409762219da71f3dc924fc5eda862f8e09bb88cUnstake2032783612024-04-21 9:58:543 days 19 hrs ago0x211158c882a2ec76e6204c9fb777fe0f39c83b9e IN  Yieldification: sYDF Token0 ETH0.00000336 0.01
0x651b0fd342dcc1d179307346f44ca05ff3a017070cd33db7c7d1937d09bb5dddClaim And Vest R...2032781322024-04-21 9:57:573 days 19 hrs ago0x211158c882a2ec76e6204c9fb777fe0f39c83b9e IN  Yieldification: sYDF Token0 ETH0.00000493 0.01
0x041173da7b6a7830803c60c1feaad4bf4935174fef781bc584c64589b368f6ddClaim And Vest R...2031730502024-04-21 2:36:414 days 2 hrs ago0x592518a9ed79a46d5b4a253401d99b42f2c29047 IN  Yieldification: sYDF Token0 ETH0.000001910.01
0xb5b3b86ec34a7fd936aea0ce9c7310af3a5760e128dce93a2371fde64ae96ebcUnstake2031578262024-04-21 1:32:414 days 3 hrs ago0x17f8c4b62040a16514e647f92af0e98a6c8e0d1e IN  Yieldification: sYDF Token0 ETH0.0000031 0.01
0x87e29c4bde169df0f74d375d167db78ea3ffe1bb2796321c1acf6a43f4b3b946Claim And Vest R...2031556162024-04-21 1:23:254 days 4 hrs ago0x17f8c4b62040a16514e647f92af0e98a6c8e0d1e IN  Yieldification: sYDF Token0 ETH0.0000023 0.01
0xaec3965662e471ad97bcd170e93bc72abc5fb6d9c882f5f5b7764beef632b315Claim And Vest R...2007053552024-04-13 20:33:1711 days 8 hrs ago0xf3b059c887172f2cc52b5e77ee3b2c8b3a32e6ef IN  Yieldification: sYDF Token0 ETH0.001981664.516131
0x9cf9f4d9fc756ef4c89d6ee685095e4624ca0f97bea166fe2f81479619376537Unstake2005255342024-04-13 7:58:2011 days 21 hrs ago0x8588f044ef45e156ab6c62d4a4628b301464c379 IN  Yieldification: sYDF Token0 ETH0.00000341 0.01
0xaa57e7e25e4a8edeb81def0dad90976b808fac7993d648f09f51a0613a8766e5Claim And Vest R...2005252172024-04-13 7:57:0011 days 21 hrs ago0x8588f044ef45e156ab6c62d4a4628b301464c379 IN  Yieldification: sYDF Token0 ETH0.00000734 0.01
0x855d22cf82870f7cef71dc856677662916d6c33087b9b2c74cf3fa1021f41ac4Stake1997044672024-04-10 22:30:1914 days 6 hrs ago0xb802330248a2e60e05b3df0c948862b208ad4f14 IN  Yieldification: sYDF Token0 ETH0.00000513 0.01
0xf6130d6799e31e2b1afabcc33de2922902f2f5cd3ddb6e2fb2d02974240b854dStake1995779252024-04-10 13:37:5014 days 15 hrs ago0x6b73f2b5ddf22a3e190893bbd83e2f0a882a7dac IN  Yieldification: sYDF Token0 ETH0.00000523 0.01
0xe3dfd3a48613b20a339ceb17dd8041844aea1a5d08841703ca9fbd10ba4fa2a4Unstake1995774972024-04-10 13:35:5914 days 15 hrs ago0x6b73f2b5ddf22a3e190893bbd83e2f0a882a7dac IN  Yieldification: sYDF Token0 ETH0.00000367 0.01
0x43f18bc48487717d8f4353ced1f60b32a15359083be1edde752aafb320e43146Claim And Vest R...1995774522024-04-10 13:35:4814 days 15 hrs ago0x6b73f2b5ddf22a3e190893bbd83e2f0a882a7dac IN  Yieldification: sYDF Token0 ETH0.00000275 0.01
0x7155a2543d22268c8a4dc36a4c6c7d96e46be8d1ef26974b614717ded6f164a0Unstake1986748362024-04-07 22:35:2917 days 6 hrs ago0xde6d497705f663b26a88d31a70cce6b7dedb3b24 IN  Yieldification: sYDF Token0 ETH0.000003230.01
0x7c991bbafb527af7fc82bbadb82c782508f123372b542e7b449c7583a37be611Claim And Vest R...1964149982024-04-01 8:51:2723 days 20 hrs ago0x74e3f8ddb61b972a264efd2ba0799f42651e4569 IN  Yieldification: sYDF Token0 ETH0.0000051 0.01
0x4cefe863939bfdd36fb74b1a463f3a688222093d3b8e7b9bfdc5e47859113765Unstake1960419772024-03-31 6:51:2024 days 22 hrs ago0x839e6b96482b79a015a410d2029493d5128263a6 IN  Yieldification: sYDF Token0 ETH0.000008580.01
0xe5617304a255de2c742074e968136873881ab377532ceea3e0fda3d88644a629Unstake1958656972024-03-30 18:32:0325 days 10 hrs ago0x43e6eb05ee1dc2e4f0793baebbd30f8afd6e28bb IN  Yieldification: sYDF Token0 ETH0.00000431 0.01
0x95443ce828733895f77b7245a73afb2de735d054880e7528186640f58f2d5b70Unstake1954345902024-03-29 12:29:4826 days 16 hrs ago0xf0a067eaae33f91f4ebb25e123334a1ca8970f3f IN  Yieldification: sYDF Token0 ETH0.000003440.01
0x45616876b6188944179a99d580fea6f13897c955256ee8d7a4385597f4277833Claim And Vest R...1954345082024-03-29 12:29:2726 days 16 hrs ago0xf0a067eaae33f91f4ebb25e123334a1ca8970f3f IN  Yieldification: sYDF Token0 ETH0.000002520.01
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OVERVIEW

Yieldification offers a unique set of NFT functionality in addition to real utility through perpetual futures trading, NFT marketplace, lending/borrowing of stake NFTs, and much more!

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x249f6a23277646e6d9d7a12fdaa2c3b4d080b4cfa3c0c2fc70cbae45d8ec1bfe720096672023-03-21 5:02:23401 days 26 mins ago Yieldification: sYDF Token Yieldification: ETH Rewards0 ETH
0x249f6a23277646e6d9d7a12fdaa2c3b4d080b4cfa3c0c2fc70cbae45d8ec1bfe720096672023-03-21 5:02:23401 days 26 mins ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0x249f6a23277646e6d9d7a12fdaa2c3b4d080b4cfa3c0c2fc70cbae45d8ec1bfe720096672023-03-21 5:02:23401 days 26 mins ago Yieldification: sYDF Token Yieldification: Yield Vester0 ETH
0x249f6a23277646e6d9d7a12fdaa2c3b4d080b4cfa3c0c2fc70cbae45d8ec1bfe720096672023-03-21 5:02:23401 days 26 mins ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0x7b030b349f69eecca5046c0cb3c4b27ddf750ce3d45202449ac9e80abb9dbb27719851152023-03-21 3:20:31401 days 2 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0x7b030b349f69eecca5046c0cb3c4b27ddf750ce3d45202449ac9e80abb9dbb27719851152023-03-21 3:20:31401 days 2 hrs ago Yieldification: sYDF Token Yieldification: Yield Vester0 ETH
0x7b030b349f69eecca5046c0cb3c4b27ddf750ce3d45202449ac9e80abb9dbb27719851152023-03-21 3:20:31401 days 2 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0x7b030b349f69eecca5046c0cb3c4b27ddf750ce3d45202449ac9e80abb9dbb27719851152023-03-21 3:20:31401 days 2 hrs ago Yieldification: sYDF Token Yieldification: Yield Vester0 ETH
0x8b4ded695d3ab0e1673cae999dfdaf1b99283b5a0ac422f95474b4999901f32e719045372023-03-20 21:38:04401 days 7 hrs ago Yieldification: sYDF Token Yieldification: ETH Rewards0 ETH
0x8b4ded695d3ab0e1673cae999dfdaf1b99283b5a0ac422f95474b4999901f32e719045372023-03-20 21:38:04401 days 7 hrs ago Yieldification: sYDF Token Yieldification: ETH Rewards0 ETH
0x8b4ded695d3ab0e1673cae999dfdaf1b99283b5a0ac422f95474b4999901f32e719045372023-03-20 21:38:04401 days 7 hrs ago Yieldfication: OTC Yieldification: sYDF Token0 ETH
0xe8d2b61df204b9dd6119a0c8410a67af1aa738a1ad4feff5f3bb9bb8e96bc9f7718717212023-03-20 19:19:18401 days 10 hrs ago Yieldification: sYDF Token Yieldification: ETH Rewards0 ETH
0xe8d2b61df204b9dd6119a0c8410a67af1aa738a1ad4feff5f3bb9bb8e96bc9f7718717212023-03-20 19:19:18401 days 10 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0xefed9108740b7a6e006d481a27438e13eb0078692525df7da5857a3765abc769718708962023-03-20 19:15:48401 days 10 hrs ago Yieldification: sYDF Token Yieldification: ETH Rewards0 ETH
0xefed9108740b7a6e006d481a27438e13eb0078692525df7da5857a3765abc769718708962023-03-20 19:15:48401 days 10 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0xefed9108740b7a6e006d481a27438e13eb0078692525df7da5857a3765abc769718708962023-03-20 19:15:48401 days 10 hrs ago Yieldification: sYDF Token Yieldification: Yield Vester0 ETH
0xefed9108740b7a6e006d481a27438e13eb0078692525df7da5857a3765abc769718708962023-03-20 19:15:48401 days 10 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0x83cccb05b6342aed4d9885a73804dd9bc05140703f7ab3c760119e4075918491718707372023-03-20 19:15:15401 days 10 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0x83cccb05b6342aed4d9885a73804dd9bc05140703f7ab3c760119e4075918491718707372023-03-20 19:15:15401 days 10 hrs ago Yieldification: sYDF Token Yieldification: Yield Vester0 ETH
0xc4a4b6023496648e40fa8da9bf70abb58265c3cbbd273c6313c97bd836a1e391718525102023-03-20 17:59:30401 days 11 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0xc4a4b6023496648e40fa8da9bf70abb58265c3cbbd273c6313c97bd836a1e391718525102023-03-20 17:59:30401 days 11 hrs ago Yieldification: sYDF Token Yieldification: Yield Vester0 ETH
0x9d2fa3c693b3aab48c8c7922dbfdfcb7b74edde1aac864f0ad4ea73cf519c8b7718294562023-03-20 16:24:02401 days 13 hrs ago Yieldification: sYDF Token Yieldification: ETH Rewards0 ETH
0x9d2fa3c693b3aab48c8c7922dbfdfcb7b74edde1aac864f0ad4ea73cf519c8b7718294562023-03-20 16:24:02401 days 13 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
0x9d2fa3c693b3aab48c8c7922dbfdfcb7b74edde1aac864f0ad4ea73cf519c8b7718294562023-03-20 16:24:02401 days 13 hrs ago Yieldification: sYDF Token Yieldification: Yield Vester0 ETH
0x9d2fa3c693b3aab48c8c7922dbfdfcb7b74edde1aac864f0ad4ea73cf519c8b7718294562023-03-20 16:24:02401 days 13 hrs ago Yieldification: sYDF Token Yieldification: YDF Token0 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
sYDF

Compiler Version
v0.8.16+commit.07a7930e

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
File 1 of 20 : sYDF.sol
/******************************************************************************************************
Staked Yieldification (sYDF)

Website: https://yieldification.com
Twitter: https://twitter.com/yieldification
Telegram: https://t.me/yieldification
******************************************************************************************************/

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.9;

import './YDFStake.sol';

contract sYDF is YDFStake {
  constructor(
    address _ydf,
    address _vester,
    address _rewards,
    string memory _baseTokenURI
  )
    YDFStake(
      'Staked Yieldification',
      'sYDF',
      _ydf,
      _ydf,
      _vester,
      _rewards,
      _baseTokenURI
    )
  {
    _addAprLockOption(2500, 0);
    _addAprLockOption(5000, 14 days);
    _addAprLockOption(10000, 120 days);
    _addAprLockOption(15000, 240 days);
    _addAprLockOption(20000, 360 days);
  }
}

File 2 of 20 : YDFStake.sol
/******************************************************************************************************
YDFStake Inheritable Contract for staking NFTs

Website: https://yieldification.com
Twitter: https://twitter.com/yieldification
Telegram: https://t.me/yieldification
******************************************************************************************************/

// SPDX-License-Identifier: Unlicensed
pragma solidity ^0.8.9;

import '@openzeppelin/contracts/access/Ownable.sol';
import '@openzeppelin/contracts/interfaces/IERC20.sol';
import '@openzeppelin/contracts/token/ERC721/ERC721.sol';
import '@openzeppelin/contracts/token/ERC721/extensions/ERC721Enumerable.sol';
import '@openzeppelin/contracts/utils/Counters.sol';
import './interfaces/IYDF.sol';
import './interfaces/IYDFVester.sol';
import './interfaces/IStakeRewards.sol';

contract YDFStake is ERC721Enumerable, Ownable {
  using Strings for uint256;
  using Counters for Counters.Counter;

  uint256 private constant ONE_YEAR = 365 days;
  uint256 private constant ONE_WEEK = 7 days;
  uint16 private constant PERCENT_DENOMENATOR = 10000;

  IERC20 internal stakeToken;
  IYDF internal ydf;
  IYDFVester internal vester;
  IStakeRewards internal rewards;

  struct AprLock {
    uint16 apr;
    uint256 lockTime;
  }
  AprLock[] internal _aprLockOptions;

  struct Stake {
    uint256 created;
    uint256 amountStaked;
    uint256 amountYDFBaseEarn;
    uint16 apr;
    uint256 lockTime;
  }
  // tokenId => Stake
  mapping(uint256 => Stake) public stakes;
  // tokenId => amount
  mapping(uint256 => uint256) public yieldClaimed;
  // tokenId => timestamp
  mapping(uint256 => uint256) public lastClaim;
  // tokenId => boolean
  mapping(uint256 => bool) public isBlacklisted;

  Counters.Counter internal _ids;
  string private baseTokenURI; // baseTokenURI can point to IPFS folder like https://ipfs.io/ipfs/{cid}/ while
  address public paymentAddress;
  address public royaltyAddress;

  // Royalties basis points (percentage using 2 decimals - 1000 = 100, 500 = 50, 0 = 0)
  uint256 private royaltyBasisPoints = 50; // 5%

  // array of all the NFT token IDs owned by a user
  mapping(address => uint256[]) public allUserOwned;
  // the index in the token ID array at allUserOwned to save gas on operations
  mapping(uint256 => uint256) public ownedIndex;

  mapping(uint256 => uint256) public tokenMintedAt;
  mapping(uint256 => uint256) public tokenLastTransferred;

  event StakeTokens(
    address indexed user,
    uint256 indexed tokenId,
    uint256 amountStaked,
    uint256 lockOptionIndex
  );
  event UnstakeTokens(address indexed user, uint256 indexed tokenId);
  event SetAnnualApr(uint256 indexed newApr);
  event SetPaymentAddress(address indexed user);
  event SetRoyaltyAddress(address indexed user);
  event SetRoyaltyBasisPoints(uint256 indexed _royaltyBasisPoints);
  event SetBaseTokenURI(string indexed newUri);
  event AddAprLockOption(uint16 indexed apr, uint256 lockTime);
  event RemoveAprLockOption(
    uint256 indexed index,
    uint16 indexed apr,
    uint256 lockTime
  );
  event UpdateAprLockOption(
    uint256 indexed index,
    uint16 indexed oldApr,
    uint256 oldLockTime,
    uint16 newApr,
    uint256 newLockTime
  );
  event SetTokenBlacklist(uint256 indexed tokenId, bool isBlacklisted);

  constructor(
    string memory _name,
    string memory _symbol,
    address _stakeToken,
    address _ydf,
    address _vester,
    address _rewards,
    string memory _baseTokenURI
  ) ERC721(_name, _symbol) {
    stakeToken = IERC20(_stakeToken);
    ydf = IYDF(_ydf);
    vester = IYDFVester(_vester);
    rewards = IStakeRewards(_rewards);
    baseTokenURI = _baseTokenURI;
  }

  function stake(uint256 _amount, uint256 _lockOptIndex) external virtual {
    _stake(msg.sender, _amount, _amount, _lockOptIndex, true);
  }

  function _stake(
    address _user,
    uint256 _amountStaked,
    uint256 _amountYDFBaseEarn,
    uint256 _lockOptIndex,
    bool _transferStakeToken
  ) internal {
    require(_lockOptIndex < _aprLockOptions.length, 'invalid lock option');
    _amountStaked = _amountStaked == 0
      ? stakeToken.balanceOf(_user)
      : _amountStaked;
    _amountYDFBaseEarn = _amountYDFBaseEarn == 0
      ? _amountStaked
      : _amountYDFBaseEarn;
    require(
      _amountStaked > 0 && _amountYDFBaseEarn > 0,
      'must stake and be earning at least some tokens'
    );
    if (_transferStakeToken) {
      stakeToken.transferFrom(_user, address(this), _amountStaked);
    }

    _ids.increment();
    stakes[_ids.current()] = Stake({
      created: block.timestamp,
      amountStaked: _amountStaked,
      amountYDFBaseEarn: _amountYDFBaseEarn,
      apr: _aprLockOptions[_lockOptIndex].apr,
      lockTime: _aprLockOptions[_lockOptIndex].lockTime
    });
    _safeMint(_user, _ids.current());
    tokenMintedAt[_ids.current()] = block.timestamp;

    emit StakeTokens(_user, _ids.current(), _amountStaked, _lockOptIndex);
  }

  function unstake(uint256 _tokenId) public {
    address _user = msg.sender;
    Stake memory _tokenStake = stakes[_tokenId];
    require(
      _user == ownerOf(_tokenId),
      'only the owner of the staked tokens can unstake'
    );
    bool _isUnstakingEarly = block.timestamp <
      _tokenStake.created + _tokenStake.lockTime;

    // send back original tokens staked
    // if unstaking early based on lock period, only get a portion back
    if (_isUnstakingEarly) {
      uint256 _timeStaked = block.timestamp - _tokenStake.created;
      uint256 _earnedAmount = (_tokenStake.amountStaked * _timeStaked) /
        _tokenStake.lockTime;
      stakeToken.transfer(_user, _earnedAmount);
      if (address(stakeToken) == address(ydf)) {
        ydf.burn(_tokenStake.amountStaked - _earnedAmount);
      } else {
        stakeToken.transfer(owner(), _tokenStake.amountStaked - _earnedAmount);
      }
    } else {
      stakeToken.transfer(_user, _tokenStake.amountStaked);
    }

    // check and create new vest if yield available to be claimed
    uint256 _totalEarnedAmount = getTotalEarnedAmount(_tokenId);
    if (_totalEarnedAmount > yieldClaimed[_tokenId]) {
      _createVestAndMint(_user, _totalEarnedAmount - yieldClaimed[_tokenId]);
    }

    // this NFT is useless after the user unstakes
    _burn(_tokenId);

    emit UnstakeTokens(_user, _tokenId);
  }

  function unstakeMulti(uint256[] memory _tokenIds) external {
    for (uint256 i = 0; i < _tokenIds.length; i++) {
      unstake(_tokenIds[i]);
    }
  }

  function claimAndVestRewards(uint256 _tokenId) public {
    require(!isBlacklisted[_tokenId], 'blacklisted NFT');

    // user can only claim and vest rewards up to once a week
    require(block.timestamp > lastClaim[_tokenId] + ONE_WEEK);
    lastClaim[_tokenId] = block.timestamp;

    uint256 _totalEarnedAmount = getTotalEarnedAmount(_tokenId);
    require(
      _totalEarnedAmount > yieldClaimed[_tokenId],
      'must have some yield to claim'
    );
    _createVestAndMint(
      ownerOf(_tokenId),
      _totalEarnedAmount - yieldClaimed[_tokenId]
    );
    yieldClaimed[_tokenId] = _totalEarnedAmount;
  }

  function claimAndVestRewardsMulti(uint256[] memory _tokenIds) external {
    for (uint256 i = 0; i < _tokenIds.length; i++) {
      claimAndVestRewards(_tokenIds[i]);
    }
  }

  function _createVestAndMint(address _user, uint256 _amount) internal {
    // store metadata for earned tokens in vesting contract for user who is unstaking
    vester.createVest(_user, _amount);
    // mint earned tokens to vesting contract
    ydf.stakeMintToVester(_amount);
  }

  // Support royalty info - See {EIP-2981}: https://eips.ethereum.org/EIPS/eip-2981
  function royaltyInfo(uint256, uint256 _salePrice)
    external
    view
    returns (address receiver, uint256 royaltyAmount)
  {
    return (royaltyAddress, (_salePrice * royaltyBasisPoints) / 1000);
  }

  function tokenURI(uint256 _tokenId)
    public
    view
    virtual
    override
    returns (string memory)
  {
    require(_exists(_tokenId), 'token does not exist');
    return string(abi.encodePacked(_baseURI(), _tokenId.toString(), '.json'));
  }

  // Contract metadata URI - Support for OpenSea: https://docs.opensea.io/docs/contract-level-metadata
  function contractURI() public view returns (string memory) {
    return string(abi.encodePacked(_baseURI(), 'contract.json'));
  }

  // Override supportsInterface - See {IERC165-supportsInterface}
  function supportsInterface(bytes4 _interfaceId)
    public
    view
    virtual
    override(ERC721Enumerable)
    returns (bool)
  {
    return super.supportsInterface(_interfaceId);
  }

  function getLastMintedTokenId() external view returns (uint256) {
    return _ids.current();
  }

  function isTokenMinted(uint256 _tokenId) external view returns (bool) {
    return _exists(_tokenId);
  }

  function setPaymentAddress(address _address) external onlyOwner {
    paymentAddress = _address;
    emit SetPaymentAddress(_address);
  }

  function setRoyaltyAddress(address _address) external onlyOwner {
    royaltyAddress = _address;
    emit SetRoyaltyAddress(_address);
  }

  function setRoyaltyBasisPoints(uint256 _points) external onlyOwner {
    royaltyBasisPoints = _points;
    emit SetRoyaltyBasisPoints(_points);
  }

  function setBaseURI(string memory _uri) external onlyOwner {
    baseTokenURI = _uri;
    emit SetBaseTokenURI(_uri);
  }

  function getAllUserOwned(address _user)
    external
    view
    returns (uint256[] memory)
  {
    return allUserOwned[_user];
  }

  function getTotalEarnedAmount(uint256 _tokenId)
    public
    view
    returns (uint256)
  {
    Stake memory _tokenStake = stakes[_tokenId];
    uint256 _secondsStaked = block.timestamp - _tokenStake.created;
    return
      (_tokenStake.amountYDFBaseEarn * _tokenStake.apr * _secondsStaked) /
      PERCENT_DENOMENATOR /
      ONE_YEAR;
  }

  function getAllLockOptions() external view returns (AprLock[] memory) {
    return _aprLockOptions;
  }

  function addAprLockOption(uint16 _apr, uint256 _lockTime) external onlyOwner {
    _addAprLockOption(_apr, _lockTime);
    emit AddAprLockOption(_apr, _lockTime);
  }

  function _addAprLockOption(uint16 _apr, uint256 _lockTime) internal {
    _aprLockOptions.push(AprLock({ apr: _apr, lockTime: _lockTime }));
  }

  function removeAprLockOption(uint256 _index) external onlyOwner {
    AprLock memory _option = _aprLockOptions[_index];
    _aprLockOptions[_index] = _aprLockOptions[_aprLockOptions.length - 1];
    _aprLockOptions.pop();
    emit RemoveAprLockOption(_index, _option.apr, _option.lockTime);
  }

  function updateAprLockOption(
    uint256 _index,
    uint16 _apr,
    uint256 _lockTime
  ) external onlyOwner {
    AprLock memory _option = _aprLockOptions[_index];
    _aprLockOptions[_index] = AprLock({ apr: _apr, lockTime: _lockTime });
    emit UpdateAprLockOption(
      _index,
      _option.apr,
      _option.lockTime,
      _apr,
      _lockTime
    );
  }

  function setIsBlacklisted(uint256 _tokenId, bool _isBlacklisted)
    external
    onlyOwner
  {
    isBlacklisted[_tokenId] = _isBlacklisted;
    emit SetTokenBlacklist(_tokenId, _isBlacklisted);
  }

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

  function _beforeTokenTransfer(
    address _from,
    address _to,
    uint256 _tokenId
  ) internal virtual override(ERC721Enumerable) {
    require(!isBlacklisted[_tokenId], 'blacklisted NFT');
    tokenLastTransferred[_tokenId] = block.timestamp;

    super._beforeTokenTransfer(_from, _to, _tokenId);
  }

  function _afterTokenTransfer(
    address _from,
    address _to,
    uint256 _tokenId
  ) internal virtual override(ERC721) {
    Stake memory _tokenStake = stakes[_tokenId];

    // if from == address(0), token is being minted
    if (_from != address(0)) {
      uint256 _currIndex = ownedIndex[_tokenId];
      uint256 _tokenIdMovingIndices = allUserOwned[_from][
        allUserOwned[_from].length - 1
      ];
      allUserOwned[_from][_currIndex] = allUserOwned[_from][
        allUserOwned[_from].length - 1
      ];
      allUserOwned[_from].pop();
      ownedIndex[_tokenIdMovingIndices] = _currIndex;
      rewards.setShare(_from, _tokenStake.amountYDFBaseEarn, true);
    }

    // if to == address(0), token is being burned
    if (_to != address(0)) {
      ownedIndex[_tokenId] = allUserOwned[_to].length;
      allUserOwned[_to].push(_tokenId);
      rewards.setShare(_to, _tokenStake.amountYDFBaseEarn, false);
    }

    super._afterTokenTransfer(_from, _to, _tokenId);
  }
}

File 3 of 20 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/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 4 of 20 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC20.sol)

pragma solidity ^0.8.0;

import "../token/ERC20/IERC20.sol";

File 5 of 20 : ERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721.sol";
import "./IERC721Receiver.sol";
import "./extensions/IERC721Metadata.sol";
import "../../utils/Address.sol";
import "../../utils/Context.sol";
import "../../utils/Strings.sol";
import "../../utils/introspection/ERC165.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata {
    using Address for address;
    using Strings for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

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

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

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

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

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165, IERC165) returns (bool) {
        return
            interfaceId == type(IERC721).interfaceId ||
            interfaceId == type(IERC721Metadata).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

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

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

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

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

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

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

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

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

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

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

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

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

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

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

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

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

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

        _afterTokenTransfer(address(0), to, tokenId);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721.ownerOf(tokenId);

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

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

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

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

        _afterTokenTransfer(owner, address(0), tokenId);
    }

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

        _beforeTokenTransfer(from, to, tokenId);

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

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

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721Receiver(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721Receiver.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

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

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {}
}

File 6 of 20 : ERC721Enumerable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721.sol";
import "./IERC721Enumerable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721Enumerable is ERC721, IERC721Enumerable {
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

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

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

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

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165, ERC721) returns (bool) {
        return interfaceId == type(IERC721Enumerable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

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

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

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

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

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

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

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

        uint256 lastTokenIndex = ERC721.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

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

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

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

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

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

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

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

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }
}

File 7 of 20 : Counters.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Counters.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

File 8 of 20 : IYDF.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import '@openzeppelin/contracts/interfaces/IERC20.sol';

/**
 * @dev YDF token interface
 */

interface IYDF is IERC20 {
  function addToBuyTracker(address _user, uint256 _amount) external;

  function burn(uint256 _amount) external;

  function stakeMintToVester(uint256 _amount) external;
}

File 9 of 20 : IYDFVester.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

/**
 * @dev YDF token vester interface
 */

interface IYDFVester {
  function createVest(address user, uint256 amount) external;
}

File 10 of 20 : IStakeRewards.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

interface IStakeRewards {
  function claimReward(bool compound) external;

  function depositRewards() external payable;

  function getShares(address wallet) external view returns (uint256);

  function setShare(
    address shareholder,
    uint256 balanceUpdate,
    bool isRemoving
  ) external;
}

File 11 of 20 : 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 12 of 20 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

File 13 of 20 : IERC721.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

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

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * 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 14 of 20 : 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 15 of 20 : 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 16 of 20 : 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 17 of 20 : 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);
    }
}

File 18 of 20 : 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 19 of 20 : 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 20 of 20 : 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);
}

Settings
{
  "metadata": {
    "bytecodeHash": "none"
  },
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

Contract ABI

[{"inputs":[{"internalType":"address","name":"_ydf","type":"address"},{"internalType":"address","name":"_vester","type":"address"},{"internalType":"address","name":"_rewards","type":"address"},{"internalType":"string","name":"_baseTokenURI","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint16","name":"apr","type":"uint16"},{"indexed":false,"internalType":"uint256","name":"lockTime","type":"uint256"}],"name":"AddAprLockOption","type":"event"},{"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":"uint256","name":"index","type":"uint256"},{"indexed":true,"internalType":"uint16","name":"apr","type":"uint16"},{"indexed":false,"internalType":"uint256","name":"lockTime","type":"uint256"}],"name":"RemoveAprLockOption","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"newApr","type":"uint256"}],"name":"SetAnnualApr","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"string","name":"newUri","type":"string"}],"name":"SetBaseTokenURI","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"}],"name":"SetPaymentAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"}],"name":"SetRoyaltyAddress","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"_royaltyBasisPoints","type":"uint256"}],"name":"SetRoyaltyBasisPoints","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"bool","name":"isBlacklisted","type":"bool"}],"name":"SetTokenBlacklist","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountStaked","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"lockOptionIndex","type":"uint256"}],"name":"StakeTokens","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"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"UnstakeTokens","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"index","type":"uint256"},{"indexed":true,"internalType":"uint16","name":"oldApr","type":"uint16"},{"indexed":false,"internalType":"uint256","name":"oldLockTime","type":"uint256"},{"indexed":false,"internalType":"uint16","name":"newApr","type":"uint16"},{"indexed":false,"internalType":"uint256","name":"newLockTime","type":"uint256"}],"name":"UpdateAprLockOption","type":"event"},{"inputs":[{"internalType":"uint16","name":"_apr","type":"uint16"},{"internalType":"uint256","name":"_lockTime","type":"uint256"}],"name":"addAprLockOption","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"allUserOwned","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"claimAndVestRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"}],"name":"claimAndVestRewardsMulti","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"contractURI","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getAllLockOptions","outputs":[{"components":[{"internalType":"uint16","name":"apr","type":"uint16"},{"internalType":"uint256","name":"lockTime","type":"uint256"}],"internalType":"struct YDFStake.AprLock[]","name":"","type":"tuple[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"getAllUserOwned","outputs":[{"internalType":"uint256[]","name":"","type":"uint256[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"getApproved","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"getLastMintedTokenId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"getTotalEarnedAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"operator","type":"address"}],"name":"isApprovedForAll","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"isBlacklisted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"isTokenMinted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"lastClaim","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"ownedIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"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":[],"name":"paymentAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_index","type":"uint256"}],"name":"removeAprLockOption","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"royaltyAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"_salePrice","type":"uint256"}],"name":"royaltyInfo","outputs":[{"internalType":"address","name":"receiver","type":"address"},{"internalType":"uint256","name":"royaltyAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"safeTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"bool","name":"approved","type":"bool"}],"name":"setApprovalForAll","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"_uri","type":"string"}],"name":"setBaseURI","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"},{"internalType":"bool","name":"_isBlacklisted","type":"bool"}],"name":"setIsBlacklisted","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"setPaymentAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_address","type":"address"}],"name":"setRoyaltyAddress","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_points","type":"uint256"}],"name":"setRoyaltyBasisPoints","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"uint256","name":"_lockOptIndex","type":"uint256"}],"name":"stake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stakes","outputs":[{"internalType":"uint256","name":"created","type":"uint256"},{"internalType":"uint256","name":"amountStaked","type":"uint256"},{"internalType":"uint256","name":"amountYDFBaseEarn","type":"uint256"},{"internalType":"uint16","name":"apr","type":"uint16"},{"internalType":"uint256","name":"lockTime","type":"uint256"}],"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":"uint256","name":"","type":"uint256"}],"name":"tokenLastTransferred","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"tokenMintedAt","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":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"transferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokenId","type":"uint256"}],"name":"unstake","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256[]","name":"_tokenIds","type":"uint256[]"}],"name":"unstakeMulti","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_index","type":"uint256"},{"internalType":"uint16","name":"_apr","type":"uint16"},{"internalType":"uint256","name":"_lockTime","type":"uint256"}],"name":"updateAprLockOption","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"yieldClaimed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]

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

00000000000000000000000030dcba0405004cf124045793e1933c798af9e66a00000000000000000000000025fd39c407965724adf515ca986db62609e9a57d00000000000000000000000027095f7907c1c2381a9c11610924d1bbbfe4ce5f0000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000002d68747470733a2f2f6170692e7969656c64696669636174696f6e2e636f6d2f737964662f6d657461646174612f00000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _ydf (address): 0x30dcBa0405004cF124045793E1933C798Af9E66a
Arg [1] : _vester (address): 0x25FD39C407965724AdF515CA986dB62609E9a57D
Arg [2] : _rewards (address): 0x27095F7907C1c2381a9C11610924D1bbbFe4Ce5F
Arg [3] : _baseTokenURI (string): https://api.yieldification.com/sydf/metadata/

-----Encoded View---------------
7 Constructor Arguments found :
Arg [0] : 00000000000000000000000030dcba0405004cf124045793e1933c798af9e66a
Arg [1] : 00000000000000000000000025fd39c407965724adf515ca986db62609e9a57d
Arg [2] : 00000000000000000000000027095f7907c1c2381a9c11610924d1bbbfe4ce5f
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [4] : 000000000000000000000000000000000000000000000000000000000000002d
Arg [5] : 68747470733a2f2f6170692e7969656c64696669636174696f6e2e636f6d2f73
Arg [6] : 7964662f6d657461646174612f00000000000000000000000000000000000000


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