Contract 0x3508848650bb8ea55390faeefa13312cb4d87e1d

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0x5495221d243852554aace9f665a768f3e7407a3ff27359863394cedfbd4c059983558212021-04-27 21:07:3488 days 13 hrs ago0x66f13fdceed822e74b6a1e08e082fa699ff36454 IN  0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB0.00047771
0x1a085b07ef655a651b0620b9ff4fe059575503c2beb5ced0e2c99255df94390583558102021-04-27 21:07:0188 days 13 hrs ago0x66f13fdceed822e74b6a1e08e082fa699ff36454 IN  0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB0.00047624
0xf20509ec0066d9d838369e045cbb95cfa15c0798e8b6798f5ca359db49dec71383558012021-04-27 21:06:3488 days 13 hrs ago0x66f13fdceed822e74b6a1e08e082fa699ff36454 IN  0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB0.00046584
0xfb8121dbb7ec974ed57572cd67c2fb7749fd8e11b8fecaeab49208d9b3288dd483557902021-04-27 21:06:0188 days 13 hrs ago0x66f13fdceed822e74b6a1e08e082fa699ff36454 IN  0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB0.00047602
0x9d6e8e6f835047126b9d59e348b430e9b2fbd847b2aa11d4a0431e0a09d9926f83557652021-04-27 21:04:4688 days 13 hrs ago0x66f13fdceed822e74b6a1e08e082fa699ff36454 IN  Contract Creation0 BNB0.00993238
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0x21d48fde95cbfc165d4b77ab71a71b0b5e3f9be6a58ea4dfe84b130e2dc151fa91506482021-05-25 12:32:3360 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
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0xf8d2c075e4abdc52b5131daebfebdd2b0d1688c330686f0306625477a40f39d091505532021-05-25 12:27:4860 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
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0xffb20bc41f9d5352680eb1a92354e174325e3d56c32b4e593c727ceda7728e0091505062021-05-25 12:25:2760 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x3a5d47795eb8191a1942ea077ba10eb2cdf83e66b43fda1912d6120d4188d44991504822021-05-25 12:24:1560 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0xc770c30027bfa85a9430add168a189860d62c4c74fe12c084a79b1eb575095ef91504582021-05-25 12:23:0360 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x0eaf202184ca44de0c0cfcf8f20a9af23f7d8ae2cc24a28315699022ebca43d091504352021-05-25 12:21:5460 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0xb79d00030f2fab01a602441837a3732139819e136094aec229e9218729fcdb5791504122021-05-25 12:20:4560 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x09d4d34685f81f4838fbc62d6347eadba39c729e2a41b4f3878d07a65031ffc191503882021-05-25 12:19:3360 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0xc1920608673007ef7f018633bd923c684798e3b53fd259a1d8cff61aefde147291503652021-05-25 12:18:2460 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x36edd64dba773be07e52d39594f0b058fb39ae727a11d7877eaf200082fe17a291503402021-05-25 12:17:0960 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0xb167091198f96d4ca17beba5e8e498026d845aceb505b33ee8621ef45fd7eec391503172021-05-25 12:16:0060 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x1ac7f9a5ff553e7d886d4cb724793f91d3b07c47fed8e7c4dc14dc20ac98f4b791502932021-05-25 12:14:4860 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0xc51dd9ad2af400e3e7869b8fef9f675080717310af91111dc554bf5144d4eaac91502702021-05-25 12:13:3960 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x82bbfc2857c4d1b3dd97f54aa9ad268e26faf5a399b458f7bdc54ba9fa8939be91502472021-05-25 12:12:3060 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0xf326d67ad17dfdf3105c8c31c14c346811ff04eac2177d2ef7f4665a99b5bb3691502232021-05-25 12:11:1860 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x509de386fdf26fb92a29ce382f21be74290a9ba42b78f3fdced21a241e54cc4291502002021-05-25 12:10:0960 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x8ed985cbccc6b2844bca1d9037123adaa9dbe1d957e6019e561b79ded9813b5991501762021-05-25 12:08:5760 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x6e536743e979113dbff08d99ae45cf28eafc067601590d986c3231bc481c683791501532021-05-25 12:07:4860 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x6896b389120268f46e59a9922e5bb21b29b577d0f5df3422d52b422a5393c98e91501302021-05-25 12:06:3960 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0x7bd82a60c3e3093789b5a071144d9f3d0b9a735601ae074dc35f581d53e3b6c091501052021-05-25 12:05:2460 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
0xd1b562a9455b88a5cf3e979cca1a4d40dd9699b8641f21741d64bb48fec714cf91500822021-05-25 12:04:1560 days 22 hrs ago 0x19a9532d072688de19eec64b8c8b32d726ec801d 0x3508848650bb8ea55390faeefa13312cb4d87e1d0 BNB
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Contract Source Code Verified (Exact Match)

Contract Name:
Registry

Compiler Version
v0.6.8+commit.0bbfe453

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-04-27
*/

// File: @openzeppelin/contracts/utils/Context.sol

// SPDX-License-Identifier: MIT

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/access/Ownable.sol


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: @openzeppelin/contracts/token/ERC20/IERC20.sol


pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves `amount` tokens from the caller's account to `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);
}

// File: @openzeppelin/contracts/math/SafeMath.sol


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: @openzeppelin/contracts/token/ERC20/ERC20.sol


pragma solidity >=0.6.0 <0.8.0;




/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin guidelines: functions revert instead
 * of returning `false` on failure. This behavior is nonetheless conventional
 * and does not conflict with the expectations of ERC20 applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20 {
    using SafeMath for uint256;

    mapping (address => uint256) private _balances;

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

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;
    uint8 private _decimals;

    /**
     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with
     * a default value of 18.
     *
     * To select a different value for {decimals}, use {_setupDecimals}.
     *
     * All three of these values are immutable: they can only be set once during
     * construction.
     */
    constructor (string memory name_, string memory symbol_) public {
        _name = name_;
        _symbol = symbol_;
        _decimals = 18;
    }

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

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5,05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is
     * called.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual returns (uint8) {
        return _decimals;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `recipient` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * 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) public virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: 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 {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual 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 {IERC20-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 virtual returns (bool) {
        _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
        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 virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(sender, recipient, amount);

        _balances[sender] = _balances[sender].sub(amount, "ERC20: 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 virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _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 virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        _balances[account] = _balances[account].sub(amount, "ERC20: 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 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 virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

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

    /**
     * @dev Sets {decimals} to a value other than the default one of 18.
     *
     * WARNING: This function should only be called from the constructor. Most
     * applications that interact with token contracts will not expect
     * {decimals} to ever change, and may work incorrectly if it does.
     */
    function _setupDecimals(uint8 decimals_) internal virtual {
        _decimals = decimals_;
    }

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

// File: contracts/interfaces/IRegistry.sol

pragma solidity 0.6.8;


interface IRegistry {
    function getAddress(bytes32 name) external view returns (address);

    function requireAndGetAddress(bytes32 name) external view returns (address);
}

// File: contracts/interfaces/IStakingBank.sol

pragma solidity ^0.6.8;


interface IStakingBank is IERC20 {
  function receiveApproval(address _from) external returns (bool success);

  function withdraw(uint256 _value) external returns (bool success);
}

// File: contracts/interfaces/IValidatorRegistry.sol

pragma solidity ^0.6.8;

interface IValidatorRegistry {
  function create(address _id, string calldata _location) external;

  function update(address _id, string calldata _location) external;

  function addresses(uint256 _ix) external view returns (address);

  function validators(address _id) external view returns (address id, string memory location);

  function getNumberOfValidators() external view returns (uint256);

  function getName() external pure returns (bytes32);
}

// File: contracts/extensions/Registrable.sol

pragma solidity 0.6.8;





abstract contract Registrable {
  IRegistry public contractRegistry;

  // ========== CONSTRUCTOR ========== //

  constructor(address _contractRegistry) internal {
    require(_contractRegistry != address(0x0), "_registry is empty");
    contractRegistry = IRegistry(_contractRegistry);
  }

  // ========== MODIFIERS ========== //

  modifier onlyFromContract(address _msgSender, bytes32 _contractName) {
    require(
      contractRegistry.getAddress(_contractName) == _msgSender,
        string(abi.encodePacked("caller is not ", _contractName))
    );
    _;
  }

  modifier withRegistrySetUp() {
    require(address(contractRegistry) != address(0x0), "_registry is empty");
    _;
  }

  // ========== VIEWS ========== //

  function getName() virtual external pure returns (bytes32);

  function validatorRegistryContract() public view returns (IValidatorRegistry) {
    return IValidatorRegistry(contractRegistry.requireAndGetAddress("ValidatorRegistry"));
  }

  function stakingBankContract() public view returns (IStakingBank) {
    return IStakingBank(contractRegistry.requireAndGetAddress("StakingBank"));
  }

  function tokenContract() public view withRegistrySetUp returns (ERC20) {
    return ERC20(contractRegistry.requireAndGetAddress("UMB"));
  }
}

// File: contracts/Registry.sol

pragma solidity 0.6.8;

// Inheritance



contract Registry is Ownable {
  mapping(bytes32 => address) public registry;

  // ========== EVENTS ========== //

  event LogRegistered(address indexed destination, bytes32 name);

  // ========== MUTATIVE FUNCTIONS ========== //

  function importAddresses(bytes32[] calldata _names, address[] calldata _destinations) external onlyOwner {
    require(_names.length == _destinations.length, "Input lengths must match");

    for (uint i = 0; i < _names.length; i++) {
      registry[_names[i]] = _destinations[i];
      emit LogRegistered(_destinations[i], _names[i]);
    }
  }

  function importContracts(address[] calldata _destinations) external onlyOwner {
    for (uint i = 0; i < _destinations.length; i++) {
      bytes32 name = Registrable(_destinations[i]).getName();
      registry[name] = _destinations[i];
      emit LogRegistered(_destinations[i], name);
    }
  }

  // ========== VIEWS ========== //

  function requireAndGetAddress(bytes32 name) external view returns (address) {
    address _foundAddress = registry[name];
    require(_foundAddress != address(0), string(abi.encodePacked("Name not registered: ", name)));
    return _foundAddress;
  }

  function getAddress(bytes32 _bytes) external view returns (address) {
    return registry[_bytes];
  }

  function getAddressByString(string memory _name) public view returns (address) {
    return registry[stringToBytes32(_name)];
  }

  function stringToBytes32(string memory _string) public pure returns (bytes32 result) {
    bytes memory tempEmptyStringTest = bytes(_string);

    if (tempEmptyStringTest.length == 0) {
      return 0x0;
    }

    assembly {
      result := mload(add(_string, 32))
    }
  }
}

Contract ABI

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"destination","type":"address"},{"indexed":false,"internalType":"bytes32","name":"name","type":"bytes32"}],"name":"LogRegistered","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"bytes32","name":"_bytes","type":"bytes32"}],"name":"getAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"_name","type":"string"}],"name":"getAddressByString","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32[]","name":"_names","type":"bytes32[]"},{"internalType":"address[]","name":"_destinations","type":"address[]"}],"name":"importAddresses","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address[]","name":"_destinations","type":"address[]"}],"name":"importContracts","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"registry","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"name","type":"bytes32"}],"name":"requireAndGetAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"string","name":"_string","type":"string"}],"name":"stringToBytes32","outputs":[{"internalType":"bytes32","name":"result","type":"bytes32"}],"stateMutability":"pure","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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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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