Contract 0x562f021423d75a1636db5be1c4d99bc005ccebfe

Contract Overview

Balance:
0 CRO

CRO Value:
$0.00

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xb7a694793f031695f87c14541fa25b9d769d73359284f861510b478dae0a5e9aPut Chimp For Sa...67235272023-01-30 0:10:2435 mins ago0xdb0006f86b8cc6dfa5eb439fe942a23cdddf9b0a IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2060717275650
0x51eacb6bb10fbfa0e3d7fa82a7b2ca5cf6932266c201091d31148c3cec04b30eSafe Transfer Fr...67193402023-01-29 17:34:167 hrs 12 mins ago0xa0a61968b119b2db3aa8e034ea6b074adfb6eb13 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.589962790711 4,824.450801491
0x10680198bc7d7c957b8d9c3b9e3c1fb71948aa9684695f66e00a99e444137288Buy Chimp67177502023-01-29 15:03:509 hrs 42 mins ago0x356bb84268b0d913524f7aa8f36d9eed44a752c8 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe1,399 CRO0.614972308829 4,824.52308681
0x83c1ad2b14c4c21e7e73702b712c978e5c2381481fa601d50b93eb7d4893e10aSet Approval For...67171172023-01-29 14:04:0010 hrs 42 mins ago0x17d3824cd49b19325b77d63312897a67136d58ec IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2232108635770
0x31ef1346d6eb7a1c96b39bb841bc9b07c2c480b09dc8c27088a30ffcc913c1eeBuy Chimp67164832023-01-29 13:04:0411 hrs 42 mins ago0xa460e509c7b6cf769e46ff97f42ffab6fbc0316b IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe1,200 CRO0.6852055646510
0x0603d8798f3e2919826dc4257705d4b06163e80c427a0a8e2d91d064ec625c20Put Chimp For Sa...67110742023-01-29 4:33:0220 hrs 13 mins ago0x05d6889ea1593b6e58b3366a95ac923fc00a37aa IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.480635401391 4,824.833124785
0xff95f8ad3c05aeb2d5bf6cd80f09b04473de517d691464a472c207ccc1573ac3Put Chimp For Sa...67110672023-01-29 4:32:2220 hrs 13 mins ago0x05d6889ea1593b6e58b3366a95ac923fc00a37aa IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.480635434318 4,824.833455317
0x315679f05d5d826e4b447c36447f204da85e70ea9408124854d4019801d16009Put Chimp For Sa...67110382023-01-29 4:29:3820 hrs 16 mins ago0x05d6889ea1593b6e58b3366a95ac923fc00a37aa IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.480635569621 4,824.834813546
0xc37847eb10d3f86a3b4a0a957d0de3008fab67255a2bc8d1aae3220c6523259eBuy Chimp67095802023-01-29 2:11:5622 hrs 34 mins ago0x19940865abb414f29b28d3dff73f012b162ab01d IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe1,569 CRO0.6852512039420
0x2100c5f8d6dbff9a1d96f81c3fc081349b8bd0f5205809d193e0ec8ed055feecSet Approval For...67090762023-01-29 1:24:2223 hrs 21 mins ago0x03859f28681d0bf1e49cc36ef25b42b8d0c5fe30 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2232281646910
0x616dfe6dc9722ae9f3b03d04e73848041924826f39fc2b7d56fb5d1ea604c878Set Approval For...67068262023-01-28 21:51:561 day 2 hrs ago0xa899ab7446b80fa686da48b25ec49bbaa6bb0645 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2232329544520
0xccb8128c493fee0f1ad41b819ce2851917efed54ed87b75a865251e84a3b02f9Set Approval For...67060832023-01-28 20:41:361 day 4 hrs ago0x617a5f6b4fd3111976106933ee56bc008532282f IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2232345390570
0xc80b86d8213e96d31ac34ba131ab8e7564dc7730c416dea9f978024bf7a1f472Set Approval For...67060442023-01-28 20:37:551 day 4 hrs ago0x617a5f6b4fd3111976106933ee56bc008532282f IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2232346176970
0x6eb47ece5745909d1a94243ad8adb5f7c66f1ffe6e47aa42f19289c382779d24Put Chimp For Sa...67046572023-01-28 18:26:481 day 6 hrs ago0xdc0906eed60ce5aea575f9a3bb981e692f14ea2d IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.206115050605 4,825.129353771
0xb85d9fd606ac84987a5a6c4f75dd9e79f4f3f921e2abc68b98714d68537f563fSet Approval For...67038092023-01-28 17:06:291 day 7 hrs ago0x767d957ea7f5d78b611eaeb84c3bf2443d26c9c5 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.223308792517 4,825.168377645
0x9a2dbf8649ed9e5d66f3335a8316623a6148d75ecc80391676244116615d6534Put Chimp For Sa...67030102023-01-28 15:50:571 day 8 hrs ago0x316eeedba5484fc53f11020883d45829f0971678 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.480672456764 4,825.205103194
0xe3a31058bd4a5aee7399d68986ff6b6e12520470f978285df20c55922e3709a1Put Chimp For Sa...67030022023-01-28 15:50:121 day 8 hrs ago0x316eeedba5484fc53f11020883d45829f0971678 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.480672493421 4,825.205471169
0x71575648822683d8368baabab8ceba8d3a653a4432c33335590927c745a1e813Put Chimp For Sa...67027832023-01-28 15:29:291 day 9 hrs ago0x4df1dab9176208d3938fdfc46f1859a7572f7750 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2060546659790
0x19fbda4b8a62445625c3367af430ad6728c9c6d404ab63b91410fcb4e02054caChimp No Longer ...67027782023-01-28 15:29:001 day 9 hrs ago0x4df1dab9176208d3938fdfc46f1859a7572f7750 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.1734656505870
0x3a5609d279e05941040ea5705272ba6248359aeda3dd5f081e082cdc71a512aaPut Chimp For Sa...67027752023-01-28 15:28:441 day 9 hrs ago0x4df1dab9176208d3938fdfc46f1859a7572f7750 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.2060546838330
0x51f4c6553f1f6a01d4bd422c20e3a0265ddba0ef337db3e5c02350cff038d228Chimp No Longer ...67017832023-01-28 13:54:581 day 10 hrs ago0x4bd5bb37eba2c314afca0b029dd0fbea78bc15e8 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.1734673020220
0x82aa2d98442011a337e30586de1bf5fe6af3d07e9d27ecfbf7100b6e23d1b967Set Approval For...67014382023-01-28 13:22:181 day 11 hrs ago0xad170a01755e5f82e0ecd615b8ce56e2eba55f37 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.223313848214 4,825.277619146
0x2b40557468b9c57b2024dd4fc775c9a6d2be0c78f6367fae8a772bc2ce26c16fPut Chimp For Sa...66979352023-01-28 7:51:051 day 16 hrs ago0x574c654c780fee341e60272a68df9d36d838940a IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.206064224860
0x2ca57962449a00d46ab16e5f3918fffea22b38f868a7109a3a17baf5ce53b154Safe Transfer Fr...66977702023-01-28 7:35:301 day 17 hrs ago0x2bd24efbd80fb501c9b15e841ea458bff0b583f3 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.611430
0x54cad166bdcf0550a27d237a7fe89e11730b367805017c0bb02ff11af3a32097Put Chimp For Sa...66968702023-01-28 6:10:201 day 18 hrs ago0xbf704944ce4ffc8245a7cfaf8a970cdd23637b68 IN  0x562f021423d75a1636db5be1c4d99bc005ccebfe0 CRO0.480700689307 4,825.488514082
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0x10680198bc7d7c957b8d9c3b9e3c1fb71948aa9684695f66e00a99e44413728867177502023-01-29 15:03:509 hrs 42 mins ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d869.95 CRO
0x10680198bc7d7c957b8d9c3b9e3c1fb71948aa9684695f66e00a99e44413728867177502023-01-29 15:03:509 hrs 42 mins ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x8540de03527a64a7f381162a2394b8f17acbb56e1,329.05 CRO
0x31ef1346d6eb7a1c96b39bb841bc9b07c2c480b09dc8c27088a30ffcc913c1ee67164832023-01-29 13:04:0411 hrs 42 mins ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d860 CRO
0x31ef1346d6eb7a1c96b39bb841bc9b07c2c480b09dc8c27088a30ffcc913c1ee67164832023-01-29 13:04:0411 hrs 42 mins ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x34a13039832d75da54b46768e5a1f492c66de5111,140 CRO
0xc37847eb10d3f86a3b4a0a957d0de3008fab67255a2bc8d1aae3220c6523259e67095802023-01-29 2:11:5622 hrs 34 mins ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d878.45 CRO
0xc37847eb10d3f86a3b4a0a957d0de3008fab67255a2bc8d1aae3220c6523259e67095802023-01-29 2:11:5622 hrs 34 mins ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x256749d6040aeaeb851e76da1b501759de77970e1,490.55 CRO
0xd32ed9d99e6aaa4ba6eb2f69e62dcf9836699f309e754fd4ef162faecda56b8466739182023-01-26 17:59:523 days 6 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d862.5 CRO
0xd32ed9d99e6aaa4ba6eb2f69e62dcf9836699f309e754fd4ef162faecda56b8466739182023-01-26 17:59:523 days 6 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x34a13039832d75da54b46768e5a1f492c66de5111,187.5 CRO
0x2e0fedc05525ed1a058f41628e6543e918bf43d04f4a6b52baca13a1b71b8bd966738982023-01-26 17:57:583 days 6 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d878.45 CRO
0x2e0fedc05525ed1a058f41628e6543e918bf43d04f4a6b52baca13a1b71b8bd966738982023-01-26 17:57:583 days 6 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x34a13039832d75da54b46768e5a1f492c66de5111,490.55 CRO
0xeedc36576d7eaf61c4425a8a37368a9d58e96b7835abcec77833c82bf79b5ee266454192023-01-24 21:07:405 days 3 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d879.95 CRO
0xeedc36576d7eaf61c4425a8a37368a9d58e96b7835abcec77833c82bf79b5ee266454192023-01-24 21:07:405 days 3 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x57059d4f4b726b5332bb3997122c1f32e1fed3001,519.05 CRO
0xa36ee7718407fae725a2383a032d051d4c6992fbccefa3b67cef6d54e8a0bacc66427282023-01-24 16:53:355 days 7 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d860 CRO
0xa36ee7718407fae725a2383a032d051d4c6992fbccefa3b67cef6d54e8a0bacc66427282023-01-24 16:53:355 days 7 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xd3d2044ad10df128291076c2439c6d3cce28c9091,140 CRO
0xfc096f639b4cc237e39b1303f8251b32c59886d79f7cde7e9eeb1c94e6359d6566233882023-01-23 10:32:156 days 14 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d864.5 CRO
0xfc096f639b4cc237e39b1303f8251b32c59886d79f7cde7e9eeb1c94e6359d6566233882023-01-23 10:32:156 days 14 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xef289ff9d1c6cfaff4e7841367a4c77d4d60e5a11,225.5 CRO
0x572805f3630e77536a99afe7163abf1e4fefcee2b35f240b3b9f4db9db86146b66087472023-01-22 11:30:587 days 13 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d855 CRO
0x572805f3630e77536a99afe7163abf1e4fefcee2b35f240b3b9f4db9db86146b66087472023-01-22 11:30:587 days 13 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xcc14cd76bc8d30037fe252747b9fb2b2364c8ce91,045 CRO
0x864de6c1594f32605718d63d265ba38be02639abcc0905c8bf81ca34093e836b65885332023-01-21 3:47:048 days 20 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d874.95 CRO
0x864de6c1594f32605718d63d265ba38be02639abcc0905c8bf81ca34093e836b65885332023-01-21 3:47:048 days 20 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x0ca0405ed9eabdb384b2036d4cf8bb98f822e3261,424.05 CRO
0x5cdf87e37aa7ea4a16bbff92c74c11f37a11784be7f4cbfbd09c862578e991b565233572023-01-16 20:51:1913 days 3 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d864.95 CRO
0x5cdf87e37aa7ea4a16bbff92c74c11f37a11784be7f4cbfbd09c862578e991b565233572023-01-16 20:51:1913 days 3 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x2bce55b5f8877abc571dfee10b8a62adbf3a3b491,234.05 CRO
0x5d110e067c549e283b58f20640da3ce65a225a3fc16e2d9af6b8a437cdae433765233512023-01-16 20:50:4613 days 3 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d864.9 CRO
0x5d110e067c549e283b58f20640da3ce65a225a3fc16e2d9af6b8a437cdae433765233512023-01-16 20:50:4613 days 3 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0x24c12a991c6e87a74ea5f1dc68c86dda200b11c01,233.1 CRO
0x88d182b221d62c0cc6a63bedce4496f730d3fcb90c641d316f249e5017be263065233452023-01-16 20:50:1113 days 3 hrs ago 0x562f021423d75a1636db5be1c4d99bc005ccebfe0xa4dba41e765a7721ff051b64865a31226f61a4d855.75 CRO
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Contract Source Code Verified (Exact Match)

Contract Name:
CronosChimp

Compiler Version
v0.7.6+commit.7338295f

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at cronoscan.com on 2022-02-23
*/

// Sources flattened with hardhat v2.6.4 https://hardhat.org

// File @openzeppelin/contracts/math/[email protected] xx



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        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) {
        // 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) {
        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) {
        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) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        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) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

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


// File contracts/utils/CronosChimpLibrary.sol

pragma solidity ^0.7.6;

library CronosChimpLibrary {
    using SafeMath for uint256;
    
    function calculateRoyalties(
        uint256 amount, 
        uint256 royaltiesBips
    ) internal view returns (uint256 amountAfterRoyalties, uint256 royaltiesAmount) {
        royaltiesAmount = amount.mul(royaltiesBips).div(10000);
        amountAfterRoyalties = amount.sub(royaltiesAmount);
    }
}


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.0 <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 GSN 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 payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


// File @openzeppelin/contracts/introspection/[email protected]



pragma solidity >=0.6.0 <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 @openzeppelin/contracts/token/ERC721/[email protected]



pragma solidity >=0.6.2 <0.8.0;

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

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

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

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

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

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

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

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

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

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

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

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


// File @openzeppelin/contracts/token/ERC721/[email protected]



pragma solidity >=0.6.2 <0.8.0;

/**
 * @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 @openzeppelin/contracts/token/ERC721/[email protected]



pragma solidity >=0.6.2 <0.8.0;

/**
 * @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 tokenId);

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


// File @openzeppelin/contracts/token/ERC721/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data) external returns (bytes4);
}


// File @openzeppelin/contracts/introspection/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts may inherit from this and call {_registerInterface} to declare
 * their support of an interface.
 */
abstract contract ERC165 is IERC165 {
    /*
     * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7
     */
    bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7;

    /**
     * @dev Mapping of interface ids to whether or not it's supported.
     */
    mapping(bytes4 => bool) private _supportedInterfaces;

    constructor () internal {
        // Derived contracts need only register support for their own interfaces,
        // we register support for ERC165 itself here
        _registerInterface(_INTERFACE_ID_ERC165);
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     *
     * Time complexity O(1), guaranteed to always use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return _supportedInterfaces[interfaceId];
    }

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


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.2 <0.8.0;

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

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

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

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (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");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.0 <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.
 */
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;

            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            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] = toDeleteIndex + 1; // All indexes are 1-based

            // 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) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }

    // 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);
    }

    // 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))));
    }


    // 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));
    }
}


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @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;
 * }
 * ```
 *
 * As of v3.0.0, only maps of type `uint256 -> address` (`UintToAddressMap`) are
 * supported.
 */
library EnumerableMap {
    // 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 MapEntry {
        bytes32 _key;
        bytes32 _value;
    }

    struct Map {
        // Storage of map keys and values
        MapEntry[] _entries;

        // Position of the entry defined by a key in the `entries` array, plus 1
        // because index 0 means a key is not in the map.
        mapping (bytes32 => uint256) _indexes;
    }

    /**
     * @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(Map storage map, bytes32 key, bytes32 value) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex == 0) { // Equivalent to !contains(map, key)
            map._entries.push(MapEntry({ _key: key, _value: value }));
            // The entry is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            map._indexes[key] = map._entries.length;
            return true;
        } else {
            map._entries[keyIndex - 1]._value = value;
            return false;
        }
    }

    /**
     * @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(Map storage map, bytes32 key) private returns (bool) {
        // We read and store the key's index to prevent multiple reads from the same storage slot
        uint256 keyIndex = map._indexes[key];

        if (keyIndex != 0) { // Equivalent to contains(map, key)
            // To delete a key-value pair from the _entries array in O(1), we swap the entry to delete with the last one
            // in the array, and then remove the last entry (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = keyIndex - 1;
            uint256 lastIndex = map._entries.length - 1;

            // When the entry to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.

            MapEntry storage lastEntry = map._entries[lastIndex];

            // Move the last entry to the index where the entry to delete is
            map._entries[toDeleteIndex] = lastEntry;
            // Update the index for the moved entry
            map._indexes[lastEntry._key] = toDeleteIndex + 1; // All indexes are 1-based

            // Delete the slot where the moved entry was stored
            map._entries.pop();

            // Delete the index for the deleted slot
            delete map._indexes[key];

            return true;
        } else {
            return false;
        }
    }

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

    /**
     * @dev Returns the number of key-value pairs in the map. O(1).
     */
    function _length(Map storage map) private view returns (uint256) {
        return map._entries.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(Map storage map, uint256 index) private view returns (bytes32, bytes32) {
        require(map._entries.length > index, "EnumerableMap: index out of bounds");

        MapEntry storage entry = map._entries[index];
        return (entry._key, entry._value);
    }

    /**
     * @dev Tries to returns the value associated with `key`.  O(1).
     * Does not revert if `key` is not in the map.
     */
    function _tryGet(Map storage map, bytes32 key) private view returns (bool, bytes32) {
        uint256 keyIndex = map._indexes[key];
        if (keyIndex == 0) return (false, 0); // Equivalent to contains(map, key)
        return (true, map._entries[keyIndex - 1]._value); // All indexes are 1-based
    }

    /**
     * @dev Returns the value associated with `key`.  O(1).
     *
     * Requirements:
     *
     * - `key` must be in the map.
     */
    function _get(Map storage map, bytes32 key) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, "EnumerableMap: nonexistent key"); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    /**
     * @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(Map storage map, bytes32 key, string memory errorMessage) private view returns (bytes32) {
        uint256 keyIndex = map._indexes[key];
        require(keyIndex != 0, errorMessage); // Equivalent to contains(map, key)
        return map._entries[keyIndex - 1]._value; // All indexes are 1-based
    }

    // UintToAddressMap

    struct UintToAddressMap {
        Map _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))));
    }
}


// File @openzeppelin/contracts/utils/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    /**
     * @dev Converts a `uint256` to its ASCII `string` 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);
        uint256 index = digits - 1;
        temp = value;
        while (temp != 0) {
            buffer[index--] = bytes1(uint8(48 + temp % 10));
            temp /= 10;
        }
        return string(buffer);
    }
}


// File @openzeppelin/contracts/token/ERC721/[email protected]



pragma solidity >=0.6.0 <0.8.0;











/**
 * @title ERC721 Non-Fungible Token Standard basic implementation
 * @dev see https://eips.ethereum.org/EIPS/eip-721
 */
contract ERC721 is Context, ERC165, IERC721, IERC721Metadata, IERC721Enumerable {
    using SafeMath for uint256;
    using Address for address;
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableMap for EnumerableMap.UintToAddressMap;
    using Strings for uint256;

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

    // Mapping from 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;

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

    // Base URI
    string private _baseURI;

    /*
     *     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
     */
    bytes4 private constant _INTERFACE_ID_ERC721 = 0x80ac58cd;

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

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

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

        // register the supported interfaces to conform to ERC721 via ERC165
        _registerInterface(_INTERFACE_ID_ERC721);
        _registerInterface(_INTERFACE_ID_ERC721_METADATA);
        _registerInterface(_INTERFACE_ID_ERC721_ENUMERABLE);
    }

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

        string memory _tokenURI = _tokenURIs[tokenId];
        string memory base = baseURI();

        // If there is no base URI, return the token URI.
        if (bytes(base).length == 0) {
            return _tokenURI;
        }
        // If both are set, concatenate the baseURI and tokenURI (via abi.encodePacked).
        if (bytes(_tokenURI).length > 0) {
            return string(abi.encodePacked(base, _tokenURI));
        }
        // If there is a baseURI but no tokenURI, concatenate the tokenID to the baseURI.
        return string(abi.encodePacked(base, tokenId.toString()));
    }

    /**
    * @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) {
        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) {
        (uint256 tokenId, ) = _tokenOwners.at(index);
        return tokenId;
    }

    /**
     * @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 || ERC721.isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not owner nor approved for all"
        );

        _approve(to, tokenId);
    }

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

        return _tokenApprovals[tokenId];
    }

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

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

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

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

        _transfer(from, to, tokenId);
    }

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

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

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

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _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 = ERC721.ownerOf(tokenId);
        return (spender == owner || getApproved(tokenId) == spender || ERC721.isApprovedForAll(owner, spender));
    }

    /**
     * @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) 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);

        _holderTokens[to].add(tokenId);

        _tokenOwners.set(tokenId, to);

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

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

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

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

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

        _holderTokens[owner].remove(tokenId);

        _tokenOwners.remove(tokenId);

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

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

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

        _tokenOwners.set(tokenId, to);

        emit Transfer(from, to, tokenId);
    }

    /**
     * @dev Sets `_tokenURI` as the tokenURI of `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _setTokenURI(uint256 tokenId, string memory _tokenURI) internal virtual {
        require(_exists(tokenId), "ERC721Metadata: URI set of nonexistent token");
        _tokenURIs[tokenId] = _tokenURI;
    }

    /**
     * @dev Internal function to set the base URI for all token IDs. It is
     * automatically added as a prefix to the value returned in {tokenURI},
     * or to the token ID if {tokenURI} is empty.
     */
    function _setBaseURI(string memory baseURI_) internal virtual {
        _baseURI = baseURI_;
    }

    /**
     * @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 == _ERC721_RECEIVED);
    }

    /**
     * @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); // internal owner
    }

    /**
     * @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 { }
}


// File @openzeppelin/contracts/access/[email protected]



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * 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 () internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

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

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

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

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


// File contracts/base/ERC721WithSale.sol

pragma solidity ^0.7.6;




contract ERC721WithSale is ERC721, Ownable {
  using SafeMath for uint256;
  using Strings for uint256;

  struct Sale {
    bool isForSale;
    uint256 tokenId;
    address seller;
    uint256 price;
  }

  mapping (uint256 => Sale) public chimpsForSale;
  
  uint256 public maxSupply;
  uint256 public royaltiesBips;

  uint256 public volume;

  constructor(
    string memory _name,
    string memory _symbol,
    uint256 _royaltiesBips 
  ) ERC721(_name, _symbol) {
    royaltiesBips = _royaltiesBips;

    require(royaltiesBips < 2500, "CronosChimp: Royalties cannot exceed 25%");
  }

  modifier onlyTradableChimp (address from, uint256 tokenId) {
    require(_exists(tokenId), "CronosChimp: TokenId does not exist");
    require(ownerOf(tokenId) == from, "CronosChimp: Chimp does not belong to user");
    _;
  }

  event PutChimpForSale(uint256 tokenId, uint256 price, address from);

  function putChimpForSale(uint256 tokenId, uint256 price) public onlyTradableChimp(_msgSender(), tokenId) {
    require(price != 0, "CronosChimp: Cannot put zero as a price");

    chimpsForSale[tokenId] = Sale(true, tokenId, _msgSender(), price);
    emit PutChimpForSale(tokenId, price, _msgSender());
  }

  event ChimpBought(uint tokenId, uint value, uint sellerRevenue, uint royalties, address seller, address buyer);

  function buyChimp(uint256 tokenId) payable public {
    Sale memory offer = chimpsForSale[tokenId];
    require(_exists(tokenId), "CronosChimp: TokenId does not exist");
    require(offer.isForSale, "CronosChimp: No Sale");
    require(msg.value == offer.price, "CronosChimp: Incorrect amount");
    require(ownerOf(tokenId) == offer.seller, "CronosChimp: Not seller"); // This is not possible but just in case
    address seller = offer.seller;

    // Transfer the NFT, this will automatically remove from market place
    _safeTransfer(seller, _msgSender(), tokenId, "");

    (uint256 amountAfterRoyalties, uint256 royaltiesAmount) = 
      CronosChimpLibrary.calculateRoyalties(msg.value, royaltiesBips);

    volume += msg.value;

    (bool success1,) = seller.call{value: amountAfterRoyalties}("");
    require(success1);

    (bool success2,) = owner().call{value: royaltiesAmount}("");
    require(success2);
    
    emit ChimpBought(tokenId, msg.value, amountAfterRoyalties, royaltiesAmount, seller, _msgSender());
  }

  event ChimpNoLongerForSale(uint256 tokenId, address from); 

  function chimpNoLongerForSale(uint256 tokenId) public onlyTradableChimp(_msgSender(), tokenId) {
    chimpsForSale[tokenId] = Sale(false, tokenId, _msgSender(), 0);
    emit ChimpNoLongerForSale(tokenId, _msgSender());
  }

  function _beforeTokenTransfer (
    address from,
    address to,
    uint256 tokenId
  ) internal virtual override {
    super._beforeTokenTransfer(from, to, tokenId);

    chimpsForSale[tokenId] = Sale(false, tokenId, address(0), 0);
  }

  // Gets all tokenIds that are onsale
  function getOnSaleTokenIds(uint256 start, uint256 end) public view 
    returns (uint256[] memory tokenIds, address[] memory sellers, uint256[] memory prices) {
    uint256 max = maxSupply > end ? end : maxSupply;

    uint256 count = 0;
    for (uint i = start; i < max; i++) {
      if (chimpsForSale[i].isForSale) {
        count++;
      }
    }

    uint256[] memory onSaleTokenIds = new uint[](count);
    address[] memory sellers = new address[](count);
    uint256[] memory prices = new uint256[](count);

    uint256 counter = 0;
    for (uint i = start; i < end; i++) {
      if (chimpsForSale[i].isForSale) {
        onSaleTokenIds[counter] = i;
        sellers[counter] = chimpsForSale[i].seller;
        prices[counter] = chimpsForSale[i].price;
        counter++;
      }
    }

    return (onSaleTokenIds, sellers, prices);
  }
}


// File contracts/CronosChimp.sol

pragma solidity ^0.7.6;



contract CronosChimp is ERC721WithSale {
  using SafeMath for uint256;
  using Strings for uint256;

  mapping(uint256 => uint256) private assignOrders;
  uint256 public chimpsRemainingToAssign;
  uint256 public mintPrice;
  uint256 public saleStartTimestamp;

  constructor(
    uint256 _mintPrice, 
    string memory _baseURIValue, 
    uint256 _maxSupply, 
    uint256 _royaltiesBips, 
    uint256 _saleStartTimestamp
  ) ERC721WithSale(
    "CronosChimp",
    "CHIMP",
    _royaltiesBips
  ) {
    mintPrice = _mintPrice;
    _setBaseURI(_baseURIValue);
    maxSupply = _maxSupply;
    chimpsRemainingToAssign = _maxSupply;
    saleStartTimestamp = _saleStartTimestamp;
  }

  function updateBaseURI(string memory _baseURIValue) public onlyOwner {
    _setBaseURI(_baseURIValue);
  }

  event UpdateMintPrice(uint256 mintPrice, address owner);

  function updateMintPrice(uint256 _mintPrice) public onlyOwner {
    mintPrice = _mintPrice;
    emit UpdateMintPrice(_mintPrice, _msgSender());
  }

  function getMintPrice(uint256 amount) public view returns (uint256) {
    return amount * mintPrice;
  }

  function _random() internal view returns(uint256) {
    return uint256(
      keccak256(
        abi.encodePacked(
          block.timestamp + block.difficulty + block.gaslimit + block.number +
          ((uint256(keccak256(abi.encodePacked(block.coinbase)))) / block.timestamp) + 
          ((uint256(keccak256(abi.encodePacked(_msgSender())))) / block.timestamp) 
        )
      )
    ) / chimpsRemainingToAssign;
  }

  function _fillAssignOrder(uint256 orderA, uint256 orderB) internal returns(uint256) {
    uint256 temp = orderA;
    if (assignOrders[orderA] > 0) temp = assignOrders[orderA];
    assignOrders[orderA] = orderB;
    if (assignOrders[orderB] > 0) assignOrders[orderA] = assignOrders[orderB];
    assignOrders[orderB] = temp;
    return assignOrders[orderA];
  }

  event ChimpsMinted(uint[] tokenIds, address buyer);

  function mintChimp(uint256 amount) public payable {
    require(block.timestamp >= saleStartTimestamp, "CronosChimp: Sale has not started yet.");
    require(amount <= 10, "CronosChimp: You cannot mint more than 10 Nfts per once");
    require(getMintPrice(amount) == msg.value, "CronosChimp: Payment amount is incorrect.");

    _mintChimp(amount, _msgSender(), true);
  }

  function adminMintChimp(uint256 amount, address recipient) public onlyOwner {
    require(block.timestamp < saleStartTimestamp, 
      "CronosChimp: Admin mint can only be executed before actual mint.");

    _mintChimp(amount, recipient, false); 
  }

  function _mintChimp(uint256 amount, address recipient, bool random) private {
    require(totalSupply() < maxSupply, "CronosChimp: Sale has already ended.");
    require(amount > 0, "CronosChimp: You cannot mint 0 Nfts.");
    require(SafeMath.add(totalSupply(), amount) <= maxSupply, 
      "CronosChimp: Exceeds maximum supply. Please try to mint less Nfts.");

    uint[] memory tokenIdsBought = new uint[](amount);

    for (uint i = 0; i < amount; i++) {
      uint256 randIndex = (random ? _random() : totalSupply()) % chimpsRemainingToAssign;
      uint256 chimpIndex = _fillAssignOrder(--chimpsRemainingToAssign, randIndex);
      _safeMint(recipient, chimpIndex);
      tokenIdsBought[i] = chimpIndex;
    }

    (bool success,) = owner().call{value: msg.value}("");
    require(success);

    emit ChimpsMinted(tokenIdsBought, _msgSender());
  }

  function tokenURI(uint256 tokenId) public view override returns (string memory) {
    require(_exists(tokenId), "CronosChimp: TokenId does not exist");

    return string(abi.encodePacked(baseURI(), tokenId.toString(), ".json"));
  }
}

Contract ABI

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name":"volume","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)

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

-----Decoded View---------------
Arg [0] : _mintPrice (uint256): 530000000000000000000
Arg [1] : _baseURIValue (string): ar://tjb4nmXFRkb-9lCaK8M9PBPoEmFstmcr3mONHJHuZU4/
Arg [2] : _maxSupply (uint256): 10000
Arg [3] : _royaltiesBips (uint256): 500
Arg [4] : _saleStartTimestamp (uint256): 1636441200

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 00000000000000000000000000000000000000000000001cbb3a3ff08d080000
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000a0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000002710
Arg [3] : 00000000000000000000000000000000000000000000000000000000000001f4
Arg [4] : 00000000000000000000000000000000000000000000000000000000618a1c70
Arg [5] : 0000000000000000000000000000000000000000000000000000000000000031
Arg [6] : 61723a2f2f746a62346e6d5846526b622d396c43614b384d395042506f456d46
Arg [7] : 73746d6372336d4f4e484a48755a55342f000000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://fc66651179e803e5eb414e1dd731b9f614d7faf325ed4bffbe5f70b7f9496ec8
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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