ETH Price: $3,076.77 (+2.86%)
Gas: 4 Gwei

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,744 (0.00%)

Market

Price

$2.10 @ 0.000683 ETH (+3.18%)

Onchain Market Cap

$210,000,000.00

Circulating Supply Market Cap

$210,279,923.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
33.208 MASK

Value
$69.74 ( ~0.0226666099370491 Eth) [0.0000%]
0x3d65768555Cb4Ac47572E07Fa880124cd9EAeAD3
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OVERVIEW

Mask Network allows users to encrypt content when posting on You-Know-Where and only the users and their friends can decrypt them.

Market

Volume (24H):$30,482,917.00
Market Capitalization:$210,279,923.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Bibox
MASK-USDT$2.07
0.0006757 Eth
$4,769,778.00
2,299,935.000 MASK
16.3017%
2
WhiteBIT
MASK-USDT$2.11
0.0006871 Eth
$3,662,906.00
1,734,906.822 MASK
12.2969%
3
Bybit
MASK-USDT$2.11
0.0006862 Eth
$3,561,612.00
1,716,745.480 MASK
12.1681%
4
HTX
MASK-USDT$2.11
0.0006884 Eth
$3,190,315.00
1,537,693.351 MASK
10.8990%
5
Bitrue
MASK-USDT$2.11
0.0006877 Eth
$2,589,381.00
1,226,097.300 MASK
8.6905%
6
Toobit
MASK-USDT$2.11
0.0006875 Eth
$2,576,299.00
1,241,740.870 MASK
8.8013%
7
Binance
MASK-USDT$2.11
0.0006865 Eth
$2,422,901.00
1,164,008.900 MASK
8.2504%
8
OKX
MASK-USDT$2.11
0.0006879 Eth
$2,175,149.00
1,048,057.593 MASK
7.4285%
9
KuCoin
MASK-USDT$2.11
0.0006880 Eth
$1,705,306.00
806,596.898 MASK
5.7171%
10
BloFin
MASK-USDT$2.11
0.0006869 Eth
$1,459,930.00
703,005.600 MASK
4.9828%
11
Bitget
MASK-USDT$2.11
0.0006868 Eth
$1,404,316.00
676,674.882 MASK
4.7962%
12
Upbit
MASK-KRW$2.16
0.0007035 Eth
$937,433.00
433,962.435 MASK
3.0759%
13
Trubit
MASK-USDT$2.11
0.0006869 Eth
$754,018.00
361,884.400 MASK
2.5650%
14
Coinbase Exchange
MASK-USD$2.11
0.0006865 Eth
$574,124.00
272,096.500 MASK
1.9286%
15
Deepcoin
MASK-USDT$2.11
0.0006879 Eth
$441,141.00
216,882.800 MASK
1.5372%
16
Websea
MASK-USDT$2.11
0.0006856 Eth
$373,259.00
0.000 MASK
0.0000%
17
LBank
MASK-USDT$2.11
0.0006879 Eth
$329,542.00
155,998.720 MASK
1.1057%
18
DigiFinex
MASK-USDT$2.11
0.0006877 Eth
$250,855.00
118,702.856 MASK
0.8414%
19
Hotcoin
MASK-USDT$2.11
0.0006863 Eth
$242,996.00
115,202.400 MASK
0.8165%
20
FMFW.io
MASK-USDT$2.09
0.0006803 Eth
$230,661.00
110,318.700 MASK
0.7819%
21
HitBTC
MASK-USDT$2.09
0.0006809 Eth
$228,990.00
110,304.540 MASK
0.7818%
22
Bitunix
MASK-USDT$2.11
0.0006866 Eth
$218,203.00
103,485.640 MASK
0.7335%
23
BitDelta
MASK-USDT$2.11
0.0006872 Eth
$176,612.00
85,100.100 MASK
0.6032%
24
OrangeX
MASK-USDT$2.11
0.0006856 Eth
$165,792.00
79,864.180 MASK
0.5661%
25
Gate.io
MASK-USDT$2.11
0.0006869 Eth
$165,679.00
79,786.947 MASK
0.5655%
26
AscendEX (BitMax)
MASK-USDT$2.12
0.0006915 Eth
$142,794.00
67,246.000 MASK
0.4766%
27
Icrypex
MASK-USDT$2.13
0.0006937 Eth
$136,286.00
63,947.074 MASK
0.4533%
28
Phemex
MASK-USDT$2.11
0.0006862 Eth
$122,239.00
57,981.839 MASK
0.4110%
29
LATOKEN
MASK-USDT$2.11
0.0006865 Eth
$118,027.00
55,964.140 MASK
0.3967%
30
BingX
MASK-USDT$2.11
0.0006874 Eth
$108,572.00
52,331.399 MASK
0.3709%
31
Tapbit
MASK-USDT$2.11
0.0006862 Eth
$103,022.00
49,620.400 MASK
0.3517%
32
Icrypex
MASK-TRY$2.11
0.0006861 Eth
$96,693.00
45,852.618 MASK
0.3250%
33
BitMart
MASK-USDT$2.11
0.0006876 Eth
$93,131.00
44,086.740 MASK
0.3125%
34
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.08
0.0006827 Eth
$77,144.00
37,418.677 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.2652%
35
bitcastle
MASK-USDT$2.11
0.0006875 Eth
$75,515.00
36,377.700 MASK
0.2578%
36
Dex-Trade
MASK-USDT$2.11
0.0006853 Eth
$53,837.00
25,559.300 MASK
0.1812%
37
Crypto.com Exchange
MASK-USDT$2.11
0.0006867 Eth
$47,366.00
22,461.400 MASK
0.1592%
38
BtcTurk | Kripto
MASK-TRY$2.11
0.0006879 Eth
$46,095.00
21,802.200 MASK
0.1545%
39
CoinW
MASK-USDT$2.11
0.0006864 Eth
$42,285.00
20,043.889 MASK
0.1421%
40
Binance
MASK-BNB$2.11
0.0006869 Eth
$35,733.00
16,985.200 MASK
0.1204%
41
MEXC
MASK-USDT$2.11
0.0006857 Eth
$33,658.00
15,969.270 MASK
0.1132%
42
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.11
0.0006859 Eth
$31,841.00
15,342.142 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1087%
43
Binance
MASK-TRY$2.10
0.0006824 Eth
$31,010.00
14,938.400 MASK
0.1059%
44
BTSE
MASK-USDT$2.11
0.0006857 Eth
$28,173.00
13,366.754 MASK
0.0947%
45
Coinbase Exchange
MASK-EUR$2.11
0.0006858 Eth
$20,886.00
9,908.270 MASK
0.0702%
46
Websea
MASK-BTC$2.11
0.0006864 Eth
$18,352.58
0.000 MASK
0.0000%
47
Koinpark
MASK-USDT$2.11
0.0006868 Eth
$17,155.80
8,141.467 MASK
0.0577%
48
Cryptology
MASK-USDT$2.11
0.0006865 Eth
$16,275.30
7,727.500 MASK
0.0548%
49
Pionex
MASK-USDT$2.11
0.0006855 Eth
$15,724.71
7,571.113 MASK
0.0537%
50
BtcTurk | Kripto
MASK-USDT$2.12
0.0006887 Eth
$13,923.28
6,578.050 MASK
0.0466%
51
Bitlo
MASK-TRY$2.12
0.0006888 Eth
$13,664.67
6,581.486 MASK
0.0466%
52
Coinbase Exchange
MASK-USDT$2.11
0.0006864 Eth
$12,463.96
5,908.080 MASK
0.0419%
53
Bitci TR
MASK-TRY$2.12
0.0006913 Eth
$11,493.27
5,540.270 MASK
0.0393%
54
Paribu
MASK-TRY$2.12
0.0006918 Eth
$9,553.82
4,505.860 MASK
0.0319%
55
Bitvavo
MASK-EUR$2.11
0.0006885 Eth
$9,099.14
4,303.940 MASK
0.0305%
56
WEEX
MASK-USDT$2.11
0.0006856 Eth
$8,928.67
4,300.045 MASK
0.0305%
57
Dex-Trade
MASK-BNB$2.11
0.0006862 Eth
$8,249.09
3,911.400 MASK
0.0277%
58
Gate.io
MASK-ETH$2.11
0.0006860 Eth
$7,774.57
3,723.887 MASK
0.0264%
59
Kanga
MASK-USDT$2.11
0.0006863 Eth
$5,839.69
0.000 MASK
0.0000%
60
Coinbase Exchange
MASK-GBP$2.11
0.0006872 Eth
$5,634.94
2,667.770 MASK
0.0189%
61
CoinEx
MASK-USDT$2.10
0.0006845 Eth
$5,136.75
2,474.402 MASK
0.0175%
62
Max Maicoin
MASK-USDT$2.10
0.0006841 Eth
$3,793.27
1,808.700 MASK
0.0128%
63
Kraken
MASK-USD$2.09
0.0006819 Eth
$3,035.08
1,449.416 MASK
0.0103%
64
TokoCrypto
MASK-USDT$2.11
0.0006874 Eth
$2,652.58
1,258.382 MASK
0.0089%
65
Mudrex
MASK-USDT$2.11
0.0006866 Eth
$1,742.94
826.327 MASK
0.0059%
66
Upbit
MASK-BTC$2.09
0.0006809 Eth
$1,704.77
815.324 MASK
0.0058%
67
Gemini
MASK-USD$2.11
0.0006881 Eth
$1,635.15
773.852 MASK
0.0055%
68
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.10
0.0006901 Eth
$1,602.36
766.788 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0054%
69
Crypto.com Exchange
MASK-USD$2.11
0.0006866 Eth
$1,468.15
696.300 MASK
0.0049%
70
Pancakeswap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.11
0.0006915 Eth
$1,326.39
630.019 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0045%
71
Bitbank
MASK-JPY$2.11
0.0006869 Eth
$920.37
435.942 MASK
0.0031%
72
Gate.io
MASK-TRY$2.12
0.0006890 Eth
$653.60
315.682 MASK
0.0022%
73
Kraken
MASK-EUR$2.04
0.0006653 Eth
$540.51
264.550 MASK
0.0019%
74
Bit2Me
MASK-EUR$2.04
0.0006650 Eth
$540.18
259.259 MASK
0.0018%
75
Nominex
MASK-USDT$2.11
0.0006857 Eth
$493.30
234.052 MASK
0.0017%
76
OKX
MASK-USDC$2.11
0.0006883 Eth
$476.18
227.432 MASK
0.0016%
77
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.09
0.0006800 Eth
$366.52
177.122 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0013%
78
OKCoin Japan
MASK-JPY$2.12
0.0006908 Eth
$213.83
101.410 MASK
0.0007%
79
Binance US
MASK-USDT$2.11
0.0006858 Eth
$113.70
53.956 MASK
0.0004%
80
Indodax
MASK-IDR$2.10
0.0006835 Eth
$104.74
49.900 MASK
0.0004%
81
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XDAC17F958D2EE523A2206206994597C13D831EC7$2.11
0.0006883 Eth
$103.70
49.153 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0003%
82
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.08
0.0006800 Eth
$97.67
45.905 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0003%
83
Nominex
MASK-BNB$2.08
0.0006792 Eth
$94.83
45.700 MASK
0.0003%
84
Pancakeswap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.16
0.0007051 Eth
$67.37
30.686 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0002%
85
Sushiswap
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.09
0.0006826 Eth
$49.87
23.907 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0002%
86
Pancakeswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.24
0.0007361 Eth
$43.28
19.370 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0001%
87
Pancakeswap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$2.05
0.0006706 Eth
$36.47
17.657 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0001%
88
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$2.10
0.0006832 Eth
$28.58
13.842 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0001%
89
TokoCrypto
MASK-BNB$2.11
0.0006865 Eth
$19.19
9.100 MASK
0.0001%
90
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.10
0.0006893 Eth
$16.63
7.911 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0001%
91
ChangeNOW
MASK-BTC$2.12
0.0006921 Eth
$13.84
6.602 MASK
0.0000%
92
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$2.10
0.0006831 Eth
$10.84
5.212 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0000%
93
Poloniex
MASK-USDT$2.10
0.0007059 Eth
$1.81
0.860 MASK
0.0000%

Contract Source Code Verified (Exact Match)

Contract Name:
MaskToken

Compiler Version
v0.6.6+commit.6c089d02

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license, Audited

Contract Source Code (Solidity)Audit Report

/**
 *Submitted for verification at Etherscan.io on 2021-02-19
*/

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

// SPDX-License-Identifier: MIT

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/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/math/SafeMath.sol

// SPDX-License-Identifier: MIT

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

// SPDX-License-Identifier: MIT

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/mask.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;



contract MaskToken is ERC20 {

    constructor() ERC20("Mask Network", "MASK") public {
        _mint(msg.sender, 100_000_000 * (10 ** uint256(decimals())));
    }
}

Contract Security Audit

Contract ABI

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Swarm Source

ipfs://1c80d98e75a30d9f20c93018473aa8e00631c18de5301dcf9daf4ca03d4b4bb1
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