Contract 0xa8c2b8eec3d368c0253ad3dae65a5f2bbb89c929 2

 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x828aaa6aef60fa94355488c62460e2d11639cb5cd4adfce298f37a3c933912ecTransfer130116382021-11-28 1:48:352 mins ago0x219110a129192e3fb6848f8d682932bee967a698 IN  CertiK: CTK Token0 BNB0.00042554
0x8d763c04d3c11dc1ea4482cfd9931dc2bf2be227a67ad739d1ad2c2bf734d027Transfer130111722021-11-28 1:23:3427 mins ago0x59b31067847bdbfacbd00b8896bb70d597deb63f IN  CertiK: CTK Token0 BNB0.000181265
0x3f475190155a659f93ef807f638f0a83f36d1d21b84c56db5fa64f81a418fd8eApprove130090642021-11-27 23:28:342 hrs 22 mins ago0xcabdb565fd39438e568bc7c2c5868a97e310ff31 IN  CertiK: CTK Token0 BNB0.00022263
0x28d7be881f2e724f73a4f440f6c091fba277769da9cce31278c7ebbe842bf553Approve130087502021-11-27 23:12:302 hrs 38 mins ago0x06ecc8caaddce82be54450b46c41bef1cf539352 IN  CertiK: CTK Token0 BNB0.00022263
0x6dc9053940d90f664082c8359e8fad1e74d478865ceec2589af0c356ef7760abApprove130083022021-11-27 22:49:023 hrs 2 mins ago0xd05c6f653e3f372b138bc3a0e2a13b7a91c44703 IN  CertiK: CTK Token0 BNB0.00022263
0x97991de644e335cba66a845f25afd7f9a41830a74d63e7848d5fd7d70622b3bdApprove130082762021-11-27 22:47:443 hrs 3 mins ago0xca5e58e051dff6a1361eddfefc74bb77308f29be IN  CertiK: CTK Token0 BNB0.00022263
0x3de2d2e844947ccab0824258c9f26e7dac3b519424f045e578949efa294a46acApprove130079822021-11-27 22:32:463 hrs 18 mins ago0x4911cba644eb232f97a4462ce5c95fa723233079 IN  CertiK: CTK Token0 BNB0.00022263
0x23761cd66f58a11a9a7230efe6620bfdfc4a47a7562b6d030d37f54a57572c3fTransfer130079772021-11-27 22:32:313 hrs 18 mins agoBinance: Hot Wallet 6 IN  CertiK: CTK Token0 BNB0.00051277
0xcb11b2199f12bff7b650b88ab50ab5b92d06c082b7a57a49324068e7cf926ab6Transfer130077512021-11-27 22:20:593 hrs 30 mins agoBinance: Hot Wallet 7 IN  CertiK: CTK Token0 BNB0.00051265
0x8019bc8e9e89019b731019383dbb33bff9c4b55dba1f48a2a8dc09756e7bd02bTransfer130067542021-11-27 21:28:294 hrs 22 mins agoBinance: Hot Wallet 6 IN  CertiK: CTK Token0 BNB0.00036265
0x6fb03096c25fdd55302e8ebc431e34367875e359f1c2db07dde1038e7480633bTransfer130065292021-11-27 21:17:094 hrs 34 mins ago0x3218fd8c83f851243b760188077a8be3fc482326 IN  CertiK: CTK Token0 BNB0.000307662
0x1e5e57c13897fd1f8fba530f4467c816ca24af10d25c9533a8b4d1d08158f3b7Transfer130060782021-11-27 20:53:164 hrs 58 mins ago0x046665e93afd0cf839f3bc9424028699862a43a5 IN  CertiK: CTK Token0 BNB0.000181385
0x1962d608114eddbb1e14867f91a57bd70483b528f666dfacbed69384080edafeTransfer130058182021-11-27 20:39:215 hrs 12 mins agoBinance: Hot Wallet 7 IN  CertiK: CTK Token0 BNB0.00036277
0xc51b384207030e237f81ea37654475a00cc6db396580ef9b886b49da96f0c202Transfer130057042021-11-27 20:33:125 hrs 18 mins ago0x4982085c9e2f89f2ecb8131eca71afad896e89cb IN  CertiK: CTK Token0 BNB0.00102554
0x2abfb428d366c920b91e0c8528905de603b787671ae0b991592df820b5e87d8bTransfer130051312021-11-27 20:02:465 hrs 48 mins agoBinance: Hot Wallet 6 IN  CertiK: CTK Token0 BNB0.00051265
0x4f1a4b5b3bb616e75f767839ff05783a101a41ef638b8d07292b1fd1b2236c97Approve130050982021-11-27 20:00:525 hrs 50 mins ago0x4cf8e41692e5df8ce8c31c645e5409959af9780b IN  CertiK: CTK Token0 BNB0.00022263
0x47eb48583d50bb2ec40d9b35eca3023cfb3904da8c0c3faccb1e2a790c34e1a1Transfer130050832021-11-27 20:00:015 hrs 51 mins ago0x8eeaddfb629ca41a1d0a458816f2e6875c214636 IN  CertiK: CTK Token0 BNB0.000181325
0x438957db33eba2c14e65b03fb683ff878a3f57f1c8df25be4863b6a8f09961d3Approve130047582021-11-27 19:43:416 hrs 7 mins ago0xd0148ffb0c46ec3e17abce1d903693e684759af6 IN  CertiK: CTK Token0 BNB0.00022263
0x87bbc46c022e5b83a0b9fcbad3f2a2b63fb98d7bd62123fe277863f7638dd16fTransfer130043912021-11-27 19:24:336 hrs 26 mins ago0x6157d364b95cbdc12c8276e40c17abdc6f1e5585 IN  CertiK: CTK Token0 BNB0.000191493
0x72a5c0c38c6a2972c9b94fec3c9b5758d14727928677178e0bd60e9c37c79c85Transfer130043202021-11-27 19:20:506 hrs 30 mins ago0x01705978dcdb248b19334bdff3e5968fc7500697 IN  CertiK: CTK Token0 BNB0.000181325
0xb88b41fee0244cd6e74e9aea0759763c1d260180f8799b8d2ecf12db3a050786Transfer130040742021-11-27 19:07:436 hrs 43 mins ago0x36e690dc17bd6f30cfa82005a13afe0606df0679 IN  CertiK: CTK Token0 BNB0.000106385
0xc86688f092fd2f030c943d83c45228f44ee51138f2f395acf2511daee1bbe2e1Transfer130039852021-11-27 19:02:526 hrs 48 mins ago0xbb950d1b2fef08aeffb01ce500e478624bb8cd8e IN  CertiK: CTK Token0 BNB0.000181385
0x120929a4960832045810d4a772d68bd1e804e9818f06f89d683c6dfcd16b6befTransfer130034472021-11-27 18:32:097 hrs 19 mins agoBinance: Hot Wallet 7 IN  CertiK: CTK Token0 BNB0.00051277
0x73beb37d545fdf69a347dac11f0d0f744bac0c336497c78de3775e7d4aff0e8fTransfer130032222021-11-27 18:20:107 hrs 31 mins ago0x8b94346852af7f49315629b0a10b5d6decf149b4 IN  CertiK: CTK Token0 BNB0.000307518
0x63c72b9ec92cb04283d9ff9d162b83510d4cc21e20d75a67d4da21e528cd7104Transfer130030912021-11-27 18:13:357 hrs 37 mins ago0x6f361db6d1422d30ed748896b63f75e8e4846463 IN  CertiK: CTK Token0 BNB0.000181385
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OVERVIEW

CertiK provides security infrastructure for the blockchain. It features various projects - CertiK security oracle, CertiK shield and CertiK Chain.

Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xeb293b86bd4813657f80657c24db597c67bd592f169d8be5c474c6a8fa2c71fa54713152021-03-07 11:58:42265 days 13 hrs ago PancakeSwap: Router CertiK: CTK Token0 BNB
0xeb293b86bd4813657f80657c24db597c67bd592f169d8be5c474c6a8fa2c71fa54713152021-03-07 11:58:42265 days 13 hrs ago PancakeSwap: CTK CertiK: CTK Token0 BNB
0xeb293b86bd4813657f80657c24db597c67bd592f169d8be5c474c6a8fa2c71fa54713152021-03-07 11:58:42265 days 13 hrs ago PancakeSwap: CTK CertiK: CTK Token0 BNB
0xeb293b86bd4813657f80657c24db597c67bd592f169d8be5c474c6a8fa2c71fa54713152021-03-07 11:58:42265 days 13 hrs ago PancakeSwap: CTK CertiK: CTK Token0 BNB
0x0b2d98624d5a71bd8a97dd8cabdeece1b18661ed44aecdd0c66c9b3cab5b641954712852021-03-07 11:57:12265 days 13 hrs ago PancakeSwap: CTK CertiK: CTK Token0 BNB
0x0b2d98624d5a71bd8a97dd8cabdeece1b18661ed44aecdd0c66c9b3cab5b641954712852021-03-07 11:57:12265 days 13 hrs ago PancakeSwap: Router CertiK: CTK Token0 BNB
0x0b2d98624d5a71bd8a97dd8cabdeece1b18661ed44aecdd0c66c9b3cab5b641954712852021-03-07 11:57:12265 days 13 hrs ago 0x0000000000b80b2b49630047c38f2810ab8fb946 CertiK: CTK Token0 BNB
0x0b2d98624d5a71bd8a97dd8cabdeece1b18661ed44aecdd0c66c9b3cab5b641954712852021-03-07 11:57:12265 days 13 hrs ago 0xa5a1e8855a0d4f6c7df6f1574cea79ba9ca47ff7 CertiK: CTK Token0 BNB
0x0b2d98624d5a71bd8a97dd8cabdeece1b18661ed44aecdd0c66c9b3cab5b641954712852021-03-07 11:57:12265 days 13 hrs ago 0xa5a1e8855a0d4f6c7df6f1574cea79ba9ca47ff7 CertiK: CTK Token0 BNB
0x0b2d98624d5a71bd8a97dd8cabdeece1b18661ed44aecdd0c66c9b3cab5b641954712852021-03-07 11:57:12265 days 13 hrs ago 0x0000000000b80b2b49630047c38f2810ab8fb946 CertiK: CTK Token0 BNB
0x0b2d98624d5a71bd8a97dd8cabdeece1b18661ed44aecdd0c66c9b3cab5b641954712852021-03-07 11:57:12265 days 13 hrs ago 0x0000000000b80b2b49630047c38f2810ab8fb946 CertiK: CTK Token0 BNB
0x613a0653fa74312e1bcab1a4cd59034641d69be259364d941344049f97fced2c54712852021-03-07 11:57:12265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0x613a0653fa74312e1bcab1a4cd59034641d69be259364d941344049f97fced2c54712852021-03-07 11:57:12265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0x0650cced26638236665480204a61108b0a1e5b0c425ffe76e3b18f0d28287af154712852021-03-07 11:57:12265 days 13 hrs ago 0x0000000000b80b2b49630047c38f2810ab8fb946 CertiK: CTK Token0 BNB
0x0650cced26638236665480204a61108b0a1e5b0c425ffe76e3b18f0d28287af154712852021-03-07 11:57:12265 days 13 hrs ago 0x0000000000b80b2b49630047c38f2810ab8fb946 CertiK: CTK Token0 BNB
0x9278a725892e2f9fc803fb2f138fa5daa5f61115576d2363708f396e097dad3e54712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0xbc3313f5fb6824cfdda715f4ec02f01e3bc0460eb885a0eb3f4cb39c1e636c6f54712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0x4d516cb0ee38fb34305e5cc961a0ad25b112ddabed9a38d3f6ab295fa573c19954712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0xd972ddb3fca1fe5bf01fd4bb433043b5535889bdcd3eed41d550b9c14ecadb5f54712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0x4ce203171db0b415aa4e4845a997c4a8d9c36357e6477082c23cd02ff82b03d854712842021-03-07 11:57:09265 days 13 hrs ago PancakeSwap: CTK CertiK: CTK Token0 BNB
0x4ce203171db0b415aa4e4845a997c4a8d9c36357e6477082c23cd02ff82b03d854712842021-03-07 11:57:09265 days 13 hrs ago PancakeSwap: CTK CertiK: CTK Token0 BNB
0xc168b656e56c61e63f9ee40b5112b2fd7865b21b432778eb63d98f7c7f909aaf54712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0x2ffcf5182bf9b30d4c64c8db1d6823eab64911f7de5aa4066dd1da3f4ea2c82554712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0x0bace0cd06d39e3f02728adbef4e898a4774afa0c14508a4b22630468d194dc054712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
0x8db6c6470145593e5f30f9e69ca40d16abb6eecf0aebc2f94171dc5331e3980354712842021-03-07 11:57:09265 days 13 hrs ago 0x764b8d9306ac90770f7bd98a2876a2a66c86af67 CertiK: CTK Token0 BNB
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Similar Match Source Code
Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x7fc510ac3e9cf8ff74090a8bf8b021892196a741

Contract Name:
BEP20Token

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2020-10-22
*/

// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;

interface IBEP20 {
  /**
   * @dev Returns the amount of tokens in existence.
   */
  function totalSupply() external view returns (uint256);

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external view returns (uint8);

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

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

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external view returns (address);

  /**
   * @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 `recipient`.
   *
   * Returns a boolean value indicating whether the operation succeeded.
   *
   * Emits a {Transfer} event.
   */
  function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
    address recipient,
    uint256 amount
  ) external returns (bool);

  /**
   * @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 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.
 */
contract Context {
  // Empty internal constructor, to prevent people from mistakenly deploying
  // an instance of this contract, which should be used via inheritance.
  constructor() internal {}

  function _msgSender() internal view returns (address payable) {
    return msg.sender;
  }

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

/**
 * @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, 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) {
    return sub(a, b, "SafeMath: subtraction overflow");
  }

  /**
   * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
   * overflow (when the result is negative).
   *
   * 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);
    uint256 c = a - b;

    return c;
  }

  /**
   * @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) {
    // 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 0;
    }

    uint256 c = a * b;
    require(c / a == b, "SafeMath: multiplication overflow");

    return c;
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts 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) {
    return div(a, b, "SafeMath: division by zero");
  }

  /**
   * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
   * division by zero. The result is rounded towards zero.
   *
   * Counterpart to Solidity's `/` operator. Note: this function uses a
   * `revert` opcode (which leaves remaining gas untouched) while Solidity
   * uses an invalid opcode to revert (consuming all remaining gas).
   *
   * Requirements:
   * - The divisor cannot be zero.
   */
  function div(
    uint256 a,
    uint256 b,
    string memory errorMessage
  ) internal pure returns (uint256) {
    // Solidity only automatically asserts when dividing by 0
    require(b > 0, errorMessage);
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold

    return c;
  }

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

  /**
   * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
   * Reverts with custom message 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,
    string memory errorMessage
  ) internal pure returns (uint256) {
    require(b != 0, errorMessage);
    return a % b;
  }
}

/**
 * @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 v3.0.0, only sets of type `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];
  }

  // 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(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(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(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(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));
  }
}

/**
 * @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 v3.3._
   */
  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 v3.3._
   */
  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);
      }
    }
  }
}

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
  using EnumerableSet for EnumerableSet.AddressSet;
  using Address for address;

  struct RoleData {
    EnumerableSet.AddressSet members;
    bytes32 adminRole;
  }

  mapping(bytes32 => RoleData) private _roles;

  bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

  /**
   * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
   *
   * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
   * {RoleAdminChanged} not being emitted signaling this.
   *
   * _Available since v3.1._
   */
  event RoleAdminChanged(
    bytes32 indexed role,
    bytes32 indexed previousAdminRole,
    bytes32 indexed newAdminRole
  );

  /**
   * @dev Emitted when `account` is granted `role`.
   *
   * `sender` is the account that originated the contract call, an admin role
   * bearer except when using {_setupRole}.
   */
  event RoleGranted(
    bytes32 indexed role,
    address indexed account,
    address indexed sender
  );

  /**
   * @dev Emitted when `account` is revoked `role`.
   *
   * `sender` is the account that originated the contract call:
   *   - if using `revokeRole`, it is the admin role bearer
   *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
   */
  event RoleRevoked(
    bytes32 indexed role,
    address indexed account,
    address indexed sender
  );

  /**
   * @dev Returns `true` if `account` has been granted `role`.
   */
  function hasRole(bytes32 role, address account) public view returns (bool) {
    return _roles[role].members.contains(account);
  }

  /**
   * @dev Returns the number of accounts that have `role`. Can be used
   * together with {getRoleMember} to enumerate all bearers of a role.
   */
  function getRoleMemberCount(bytes32 role) public view returns (uint256) {
    return _roles[role].members.length();
  }

  /**
   * @dev Returns one of the accounts that have `role`. `index` must be a
   * value between 0 and {getRoleMemberCount}, non-inclusive.
   *
   * Role bearers are not sorted in any particular way, and their ordering may
   * change at any point.
   *
   * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
   * you perform all queries on the same block. See the following
   * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
   * for more information.
   */
  function getRoleMember(bytes32 role, uint256 index)
    public
    view
    returns (address)
  {
    return _roles[role].members.at(index);
  }

  /**
   * @dev Returns the admin role that controls `role`. See {grantRole} and
   * {revokeRole}.
   *
   * To change a role's admin, use {_setRoleAdmin}.
   */
  function getRoleAdmin(bytes32 role) public view returns (bytes32) {
    return _roles[role].adminRole;
  }

  /**
   * @dev Grants `role` to `account`.
   *
   * If `account` had not been already granted `role`, emits a {RoleGranted}
   * event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   */
  function grantRole(bytes32 role, address account) public virtual {
    require(
      hasRole(_roles[role].adminRole, _msgSender()),
      "AccessControl: sender must be an admin to grant"
    );

    _grantRole(role, account);
  }

  /**
   * @dev Revokes `role` from `account`.
   *
   * If `account` had been granted `role`, emits a {RoleRevoked} event.
   *
   * Requirements:
   *
   * - the caller must have ``role``'s admin role.
   */
  function revokeRole(bytes32 role, address account) public virtual {
    require(
      hasRole(_roles[role].adminRole, _msgSender()),
      "AccessControl: sender must be an admin to revoke"
    );

    _revokeRole(role, account);
  }

  /**
   * @dev Revokes `role` from the calling account.
   *
   * Roles are often managed via {grantRole} and {revokeRole}: this function's
   * purpose is to provide a mechanism for accounts to lose their privileges
   * if they are compromised (such as when a trusted device is misplaced).
   *
   * If the calling account had been granted `role`, emits a {RoleRevoked}
   * event.
   *
   * Requirements:
   *
   * - the caller must be `account`.
   */
  function renounceRole(bytes32 role, address account) public virtual {
    require(
      account == _msgSender(),
      "AccessControl: can only renounce roles for self"
    );

    _revokeRole(role, account);
  }

  /**
   * @dev Grants `role` to `account`.
   *
   * If `account` had not been already granted `role`, emits a {RoleGranted}
   * event. Note that unlike {grantRole}, this function doesn't perform any
   * checks on the calling account.
   *
   * [WARNING]
   * ====
   * This function should only be called from the constructor when setting
   * up the initial roles for the system.
   *
   * Using this function in any other way is effectively circumventing the admin
   * system imposed by {AccessControl}.
   * ====
   */
  function _setupRole(bytes32 role, address account) internal virtual {
    _grantRole(role, account);
  }

  /**
   * @dev Sets `adminRole` as ``role``'s admin role.
   *
   * Emits a {RoleAdminChanged} event.
   */
  function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
    emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
    _roles[role].adminRole = adminRole;
  }

  function _grantRole(bytes32 role, address account) private {
    if (_roles[role].members.add(account)) {
      emit RoleGranted(role, account, _msgSender());
    }
  }

  function _revokeRole(bytes32 role, address account) private {
    if (_roles[role].members.remove(account)) {
      emit RoleRevoked(role, account, _msgSender());
    }
  }
}

contract BEP20Token is Context, IBEP20, AccessControl {
  using SafeMath for uint256;

  mapping(address => uint256) private _balances;
  // to store processed CTK => BCTK txs (user send tx to certik admin addr)
  mapping(string => uint256) private _ctkTxMap;
  // to store processed BCTK => CTK txs (user send tx to owner)
  mapping(string => uint256) private _bscTxMap;

  mapping(address => mapping(address => uint256)) private _allowances;
  mapping(address => uint256) private _operatorQuota;

  uint256 private _totalSupply;
  uint8 private _decimals;
  string private _symbol;
  string private _name;
  address private _owner; // essential variable for getOwner() which required by IBEP20 interface

  bytes32 public constant OPERATOR_ROLE = keccak256("OPERATOR_ROLE");

  event TransferWithMemo(
    address indexed msgSender,
    address indexed recipient,
    uint256 indexed amount,
    string memo
    );

  constructor() public {
    _name = "CertiK Token"; // token name
    _symbol = "CTK"; // token symbol
    _decimals = 6; // number of decimals for token
    _totalSupply = 0; // total initial token supply
    _balances[msg.sender] = _totalSupply; // total initial token supply for contract deployer
    _owner = msg.sender;

    emit Transfer(address(0), _owner, _totalSupply);

    _setupRole(DEFAULT_ADMIN_ROLE, _owner); // set admin role to contract deployer
  }

  modifier onlyAdmin() {
    require(isAdmin(msg.sender), "restricted to administrator");
    _;
  }

  modifier onlyOperator() {
    require(isOperator(msg.sender), "restricted to operator");
    _;
  }

  function isAdmin(address account) public virtual view returns (bool) {
    return hasRole(DEFAULT_ADMIN_ROLE, account);
  }

  function isOperator(address account) public virtual view returns (bool) {
    return hasRole(OPERATOR_ROLE, account);
  }

  function addOperator(address account, uint256 quota)
    public
    virtual
    onlyAdmin
  {
    grantRole(OPERATOR_ROLE, account);
    _operatorQuota[account] = quota;
  }

  function revokeOperator(address account) public virtual onlyAdmin {
    revokeRole(OPERATOR_ROLE, account);
    _operatorQuota[account] = 0;
  }

  /**
   * @dev Returns the bep token owner.
   */
  function getOwner() external override view returns (address) {
    return _owner;
  }

  /**
   * @dev Returns the token decimals.
   */
  function decimals() external override view returns (uint8) {
    return _decimals;
  }

  /**
   * @dev Returns the token symbol.
   */
  function symbol() external override view returns (string memory) {
    return _symbol;
  }

  /**
   * @dev Returns the token name.
   */
  function name() external override view returns (string memory) {
    return _name;
  }

  /**
   * @dev See {BEP20-totalSupply}.
   */
  function totalSupply() external override view returns (uint256) {
    return _totalSupply;
  }

  /**
   * @dev See {BEP20-balanceOf}.
   */
  function balanceOf(address account) external override view returns (uint256) {
    return _balances[account];
  }

  /**
   * @dev Check if a certain CTK TX exists
   *
   * Requirements:
   *
   * - `ctkTxHash` cannot be empty.
   */
  function checkCTKTx(string calldata ctkTxHash)
    external
    view
    returns (uint256)
  {
    require(
      bytes(ctkTxHash).length != 0,
      "BEP20: transaction hash should not be empty"
    );
    string memory uppercaseCtkTxHash = _toUpper(ctkTxHash);
    return _ctkTxMap[uppercaseCtkTxHash];
  }

  /**
   * @dev Check if a certain BSC TX exists
   *
   * Requirements:
   *
   * - `bscTxHash` cannot be empty.
   */
  function checkBSCTx(string calldata bscTxHash)
    external
    view
    returns (uint256)
  {
    require(
      bytes(bscTxHash).length != 0,
      "BEP20: transaction hash should not be empty"
    );
    string memory uppercaseTxHash = _toUpper(bscTxHash);
    return _bscTxMap[uppercaseTxHash];
  }

  /**
   * @dev See {BEP20-transfer}.
   *
   * Requirements:
   *
   * - `recipient` cannot be the zero address.
   * - the caller must have a balance of at least `amount`.
   */
  function transfer(address recipient, uint256 amount)
    external
    override
    returns (bool)
  {
    _transfer(_msgSender(), recipient, amount);
    return true;
  }

  /**
   * @dev transfer the token with memo event
   *
   * Requirements:
   *
   * - `recipient` cannot be the zero address.
   * - the caller must have a balance of at least `amount`.
   */
  function transferWithMemo(string memory memo, address recipient, uint256 amount)
    external
    returns (bool)
  {
    _transfer(_msgSender(),recipient, amount);
    emit TransferWithMemo(_msgSender(), recipient, amount, memo);
    return true;
  }

  /**
   * @dev See {BEP20-allowance}.
   */
  function allowance(address owner, address spender)
    external
    override
    view
    returns (uint256)
  {
    return _allowances[owner][spender];
  }

  /**
   * @dev See {BEP20-approve}.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function approve(address spender, uint256 amount)
    external
    override
    returns (bool)
  {
    _approve(_msgSender(), spender, amount);
    return true;
  }

  /**
   * @dev See {BEP20-transferFrom}.
   *
   * Emits an {Approval} event indicating the updated allowance. This is not
   * required by the EIP. See the note at the beginning of {BEP20};
   *
   * Requirements:
   * - `sender` and `recipient` cannot be the zero address.
   * - `sender` must have a balance of at least `amount`.
   * - the caller must have allowance for `sender`'s tokens of at least
   * `amount`.
   */
  function transferFrom(
    address sender,
    address recipient,
    uint256 amount
  ) external override returns (bool) {
    _transfer(sender, recipient, amount);
    _approve(
      sender,
      _msgSender(),
      _allowances[sender][_msgSender()].sub(
        amount,
        "BEP20: transfer amount exceeds allowance"
      )
    );
    return true;
  }

  /**
   * @dev Atomically increases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {BEP20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   */
  function increaseAllowance(address spender, uint256 addedValue)
    public
    returns (bool)
  {
    _approve(
      _msgSender(),
      spender,
      _allowances[_msgSender()][spender].add(addedValue)
    );
    return true;
  }

  /**
   * @dev Atomically decreases the allowance granted to `spender` by the caller.
   *
   * This is an alternative to {approve} that can be used as a mitigation for
   * problems described in {BEP20-approve}.
   *
   * Emits an {Approval} event indicating the updated allowance.
   *
   * Requirements:
   *
   * - `spender` cannot be the zero address.
   * - `spender` must have allowance for the caller of at least
   * `subtractedValue`.
   */
  function decreaseAllowance(address spender, uint256 subtractedValue)
    public
    returns (bool)
  {
    _approve(
      _msgSender(),
      spender,
      _allowances[_msgSender()][spender].sub(
        subtractedValue,
        "BEP20: decreased allowance below zero"
      )
    );
    return true;
  }

  /**
   * @dev Creates `amount` tokens and assigns them to `msg.sender`, increasing
   * the total supply.
   *
   * Requirements
   *
   * - `msg.sender` must be the token owner
   */
  function mint(
    string memory ctkTxHash,
    address account,
    uint256 amount
  ) public onlyOperator returns (bool) {
    require(
      bytes(ctkTxHash).length != 0,
      "BEP20: transaction hash should not be empty"
    );
    string memory uppercaseTxHash = _toUpper(ctkTxHash);
    require(_ctkTxMap[uppercaseTxHash] == 0, "BEP20: transaction hash exists");
    require(
      _operatorQuota[msg.sender] >= amount,
      "operator quota is insufficient, please rotate operator key"
    );

    _operatorQuota[msg.sender] -= amount;
    _ctkTxMap[uppercaseTxHash] = amount;
    _mint(account, amount);

    return true;
  }

  /**
   * @dev Destroys `amount` tokens and remove them from `owner` address, decrease
   * the total supply.
   *
   * Requirements
   *
   * - `_msgSender()` must be one of the operators
   */
  function burn(uint256 amount, string memory bscTxHash)
    public
    onlyOperator
    returns (bool)
  {
    require(
      bytes(bscTxHash).length != 0,
      "BEP20: bsc transaction hash should not be empty"
    );
    string memory uppercaseTxHash = _toUpper(bscTxHash);
    require(
      _bscTxMap[uppercaseTxHash] == 0,
      "BEP20: bsc transaction hash exists"
    );

    _bscTxMap[uppercaseTxHash] = amount;
    _burn(_owner, amount);

    return true;
  }

  /**
   * @dev Moves tokens `amount` from `sender` to `recipient`.
   *
   * This is internal function is equivalent to {transfer}, and can be used to
   * e.g. implement automatic token fees, slashing mechanisms, etc.
   *
   * Emits a {Transfer} event.
   *
   * Requirements:
   *
   * - `sender` cannot be the zero address.
   * - `recipient` cannot be the zero address.
   * - `sender` must have a balance of at least `amount`.
   */
  function _transfer(
    address sender,
    address recipient,
    uint256 amount
  ) internal {
    require(sender != address(0), "BEP20: transfer from the zero address");
    require(recipient != address(0), "BEP20: transfer to the zero address");

    _balances[sender] = _balances[sender].sub(
      amount,
      "BEP20: transfer amount exceeds balance"
    );
    _balances[recipient] = _balances[recipient].add(amount);
    emit Transfer(sender, recipient, amount);
  }

  /** @dev Creates `amount` tokens and assigns them to `account`, increasing
   * the total supply.
   *
   * Emits a {Transfer} event with `from` set to the zero address.
   *
   * Requirements
   *
   * - `to` cannot be the zero address.
   */
  function _mint(address account, uint256 amount) internal {
    require(account != address(0), "BEP20: mint to the zero address");

    _totalSupply = _totalSupply.add(amount);
    _balances[account] = _balances[account].add(amount);
    emit Transfer(address(0), account, amount);
  }

  /**
   * @dev Destroys `amount` tokens from `account`, reducing the
   * total supply.
   *
   * Emits a {Transfer} event with `to` set to the zero address.
   *
   * Requirements
   *
   * - `account` cannot be the zero address.
   * - `account` must have at least `amount` tokens.
   */
  function _burn(address account, uint256 amount) internal {
    require(account != address(0), "BEP20: burn from the zero address");

    _balances[account] = _balances[account].sub(
      amount,
      "BEP20: burn amount exceeds balance"
    );
    _totalSupply = _totalSupply.sub(amount);
    emit Transfer(account, address(0), amount);
  }

  /**
   * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
   *
   * This is internal function is equivalent to `approve`, and can be used to
   * e.g. set automatic allowances for certain subsystems, etc.
   *
   * Emits an {Approval} event.
   *
   * Requirements:
   *
   * - `owner` cannot be the zero address.
   * - `spender` cannot be the zero address.
   */
  function _approve(
    address owner,
    address spender,
    uint256 amount
  ) internal {
    require(owner != address(0), "BEP20: approve from the zero address");
    require(spender != address(0), "BEP20: approve to the zero address");

    _allowances[owner][spender] = amount;
    emit Approval(owner, spender, amount);
  }

  /**
   * @dev Converts tx string to all UPPERCASE.
   *
   * REF: https://gist.github.com/ottodevs/c43d0a8b4b891ac2da675f825b1d1dbf
   */

  function _toUpper(string memory str) internal pure returns (string memory) {
    bytes memory bStr = bytes(str);
    bytes memory bUpper = new bytes(bStr.length);
    for (uint256 i = 0; i < bStr.length; i++) {
      if ((uint8(bStr[i]) >= 97) && (uint8(bStr[i]) <= 122)) {
        bUpper[i] = bytes1(uint8(bStr[i]) - 32);
      } else {
        bUpper[i] = bStr[i];
      }
    }
    return string(bUpper);
  }
}

Contract Security Audit

Contract ABI

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tability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"grantRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"hasRole","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isAdmin","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isOperator","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"ctkTxHash","type":"string"},{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"mint","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"renounceRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"revokeOperator","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"role","type":"bytes32"},{"internalType":"address","name":"account","type":"address"}],"name":"revokeRole","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","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":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"memo","type":"string"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferWithMemo","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://c01f7d17953ce21e225a3ea3132ac23f9e9affa10b80620c58b1ba165a11319d
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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