ETH Price: $2,677.65 (-0.72%)

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

14,065 ( 0.014%)

Market

Price

$2.39 @ 0.000893 ETH (-1.46%)

Onchain Market Cap

$239,000,000.00

Circulating Supply Market Cap

$238,897,425.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 MASK

Value
$0.00
0x18e91b035e6987fd05d91c29b395bcd87010ac94
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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):$60,491,423.00
Market Capitalization:$238,897,425.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
BTCC
MASK-USDT$2.39
0.0008911 Eth
$27,715,265.00
11,576,081.000 MASK
46.1987%
2
Binance
MASK-USDT$2.39
0.0008907 Eth
$3,714,541.00
1,548,327.900 MASK
6.1792%
3
Bitrue
MASK-USDT$2.39
0.0008917 Eth
$3,390,076.00
1,419,799.300 MASK
5.6662%
4
Nami.Exchange
MASK-USDT$2.39
0.0008916 Eth
$2,434,912.00
1,019,459.400 MASK
4.0685%
5
Bibox
MASK-USDT$2.40
0.0008961 Eth
$2,421,423.00
1,009,438.000 MASK
4.0285%
6
Nami.Exchange
MASK-VNST$2.39
0.0008914 Eth
$2,355,894.00
986,671.900 MASK
3.9377%
7
HTX
MASK-USDT$2.39
0.0008908 Eth
$1,742,970.00
728,070.667 MASK
2.9056%
8
OKX
MASK-USDT$2.39
0.0008932 Eth
$1,581,357.00
659,206.774 MASK
2.6308%
9
Upbit
MASK-KRW$2.40
0.0008969 Eth
$1,567,879.00
653,014.493 MASK
2.6061%
10
Bitget
MASK-USDT$2.39
0.0008921 Eth
$1,452,170.00
606,537.346 MASK
2.4206%
11
BloFin
MASK-USDT$2.39
0.0008932 Eth
$1,405,315.00
586,272.400 MASK
2.3397%
12
Biconomy.com
MASK-USDT$2.39
0.0008917 Eth
$1,060,869.00
442,858.628 MASK
1.7674%
13
WhiteBIT
MASK-USDT$2.39
0.0008924 Eth
$906,910.00
379,577.496 MASK
1.5148%
14
BYDFi
MASK-USDT$2.38
0.0008900 Eth
$724,467.00
304,469.700 MASK
1.2151%
15
Byte Exchange
MASK-USDT$2.38
0.0008902 Eth
$713,938.00
299,560.890 MASK
1.1955%
16
Trubit
MASK-USDT$2.39
0.0008925 Eth
$662,399.00
277,799.400 MASK
1.1087%
17
Bybit
MASK-USDT$2.39
0.0008915 Eth
$617,745.00
258,041.970 MASK
1.0298%
18
Websea
MASK-USDT$2.39
0.0008914 Eth
$538,187.00
0.000 MASK
0.0000%
19
Deepcoin
MASK-USDT$2.39
0.0008926 Eth
$429,436.00
181,000.400 MASK
0.7224%
20
Toobit
MASK-USDT$2.39
0.0008915 Eth
$405,559.00
169,047.610 MASK
0.6746%
21
KuCoin
MASK-USDT$2.39
0.0008919 Eth
$350,105.00
146,625.602 MASK
0.5852%
22
Hotcoin
MASK-USDT$2.39
0.0008916 Eth
$254,403.00
106,520.400 MASK
0.4251%
23
FameEX
MASK-USDT$2.39
0.0008917 Eth
$236,404.00
98,568.000 MASK
0.3934%
24
Coinbase Exchange
MASK-USD$2.39
0.0008925 Eth
$201,541.00
84,326.700 MASK
0.3365%
25
Bitunix
MASK-USDT$2.39
0.0008921 Eth
$188,839.00
78,965.010 MASK
0.3151%
26
FMFW.io
MASK-USDT$2.39
0.0008912 Eth
$184,048.00
77,133.980 MASK
0.3078%
27
HitBTC
MASK-USDT$2.39
0.0008914 Eth
$183,292.00
76,326.040 MASK
0.3046%
28
Phemex
MASK-USDT$2.39
0.0008917 Eth
$176,575.00
73,960.004 MASK
0.2952%
29
BitDelta
MASK-USDT$2.39
0.0008921 Eth
$170,159.00
71,081.200 MASK
0.2837%
30
BIT
MASK-USDT$2.39
0.0008929 Eth
$166,827.00
69,794.766 MASK
0.2785%
31
Tapbit
MASK-USDT$2.39
0.0008912 Eth
$160,297.00
66,950.000 MASK
0.2672%
32
Icrypex
MASK-USDT$2.37
0.0008869 Eth
$160,266.00
67,494.904 MASK
0.2694%
33
DigiFinex
MASK-USDT$2.39
0.0008912 Eth
$160,017.00
67,066.152 MASK
0.2677%
34
MEXC
MASK-USDT$2.39
0.0008929 Eth
$159,992.00
66,850.430 MASK
0.2668%
35
LBank
MASK-USDT$2.39
0.0008909 Eth
$152,621.00
63,972.930 MASK
0.2553%
36
AscendEX (BitMax)
MASK-USDT$2.38
0.0008891 Eth
$141,901.00
59,616.200 MASK
0.2379%
37
OrangeX
MASK-USDT$2.39
0.0008914 Eth
$137,519.00
57,304.550 MASK
0.2287%
38
Dex-Trade
MASK-USDT$2.39
0.0008913 Eth
$122,172.00
51,193.100 MASK
0.2043%
39
bitcastle
MASK-USDT$2.39
0.0008922 Eth
$115,177.00
47,984.700 MASK
0.1915%
40
Bithumb
MASK-KRW$2.38
0.0008899 Eth
$112,939.00
47,400.337 MASK
0.1892%
41
Icrypex
MASK-TRY$2.40
0.0008962 Eth
$110,368.00
46,003.282 MASK
0.1836%
42
BitMart
MASK-USDT$2.39
0.0008927 Eth
$99,387.00
41,561.180 MASK
0.1659%
43
Gate.io
MASK-USDT$2.39
0.0008928 Eth
$97,491.00
40,646.590 MASK
0.1622%
44
BingX
MASK-USDT$2.39
0.0008917 Eth
$89,047.00
37,190.438 MASK
0.1484%
45
ProBit Global
MASK-USDT$2.39
0.0008922 Eth
$88,843.00
37,163.489 MASK
0.1483%
46
BtcTurk | Kripto
MASK-TRY$2.38
0.0008884 Eth
$76,098.00
31,992.090 MASK
0.1277%
47
PointPay
MASK-USDT$2.39
0.0008921 Eth
$62,103.00
25,876.741 MASK
0.1033%
48
CoinW
MASK-USDT$2.39
0.0008924 Eth
$53,392.00
22,336.874 MASK
0.0891%
49
Bitvavo
MASK-EUR$2.38
0.0008892 Eth
$52,235.00
21,927.025 MASK
0.0875%
50
BTSE
MASK-USDT$2.39
0.0008921 Eth
$45,089.00
18,880.040 MASK
0.0753%
51
LATOKEN
MASK-USDT$2.39
0.0008915 Eth
$35,968.00
15,059.776 MASK
0.0601%
52
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.38
0.0008888 Eth
$35,566.00
14,895.159 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0594%
53
Binance
MASK-BNB$2.39
0.0008911 Eth
$33,084.00
13,864.000 MASK
0.0553%
54
Pionex
MASK-USDT$2.39
0.0008919 Eth
$31,860.00
13,295.248 MASK
0.0531%
55
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.39
0.0008935 Eth
$30,790.00
12,803.860 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0511%
56
Koinpark
MASK-USDT$2.38
0.0008896 Eth
$26,159.00
10,998.707 MASK
0.0439%
57
Binance
MASK-TRY$2.39
0.0008936 Eth
$24,252.00
10,136.000 MASK
0.0405%
58
CoinEx
MASK-USDT$2.39
0.0008910 Eth
$20,911.00
8,695.876 MASK
0.0347%
59
Cryptology
MASK-USDT$2.39
0.0008921 Eth
$18,783.97
7,861.189 MASK
0.0314%
60
Nominex
MASK-USDT$2.39
0.0008916 Eth
$17,694.91
7,408.992 MASK
0.0296%
61
Bitci TR
MASK-TRY$2.38
0.0008884 Eth
$14,662.76
6,108.060 MASK
0.0244%
62
Kraken
MASK-USD$2.37
0.0008841 Eth
$12,765.43
5,393.085 MASK
0.0215%
63
Paribu
MASK-TRY$2.37
0.0008861 Eth
$11,396.50
4,809.520 MASK
0.0192%
64
BtcTurk | Kripto
MASK-USDT$2.38
0.0008872 Eth
$10,582.04
4,454.680 MASK
0.0178%
65
Bitlo
MASK-TRY$2.40
0.0008952 Eth
$8,318.31
3,452.888 MASK
0.0138%
66
Crypto.com Exchange
MASK-USDT$2.39
0.0008921 Eth
$7,566.76
3,168.000 MASK
0.0126%
67
Vindax
MASK-USDT$2.37
0.0008860 Eth
$7,383.09
3,117.500 MASK
0.0124%
68
OKX
MASK-USDC$2.37
0.0008863 Eth
$7,266.17
3,031.782 MASK
0.0121%
69
Kanga
MASK-USDT$2.39
0.0008919 Eth
$6,711.79
0.000 MASK
0.0000%
70
Coinbase Exchange
MASK-USDT$2.38
0.0008887 Eth
$6,190.31
2,601.280 MASK
0.0104%
71
Coinbase Exchange
MASK-EUR$2.39
0.0008925 Eth
$4,584.14
1,917.490 MASK
0.0077%
72
WEEX
MASK-USDT$2.39
0.0008923 Eth
$4,542.60
1,896.400 MASK
0.0076%
73
Crypto.com Exchange
MASK-USD$2.39
0.0008922 Eth
$4,177.12
1,748.700 MASK
0.0070%
74
Gemini
MASK-USD$2.35
0.0008785 Eth
$4,173.01
1,774.239 MASK
0.0071%
75
Coinbase Exchange
MASK-GBP$2.39
0.0008918 Eth
$2,632.05
1,102.170 MASK
0.0044%
76
Bitbank
MASK-JPY$2.38
0.0008888 Eth
$2,169.79
911.236 MASK
0.0036%
77
Max Maicoin
MASK-USDT$2.39
0.0008915 Eth
$1,373.31
575.100 MASK
0.0023%
78
Mudrex
MASK-USDT$2.39
0.0008913 Eth
$1,246.19
522.007 MASK
0.0021%
79
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.38
0.0008888 Eth
$1,112.85
467.076 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0019%
80
Dex-Trade
MASK-BNB$2.37
0.0008870 Eth
$1,105.47
465.500 MASK
0.0019%
81
Kraken
MASK-EUR$2.39
0.0008908 Eth
$972.43
407.710 MASK
0.0016%
82
Bit2Me
MASK-EUR$2.39
0.0008902 Eth
$965.48
399.555 MASK
0.0016%
83
Binance US
MASK-USDT$2.41
0.0008988 Eth
$908.12
377.399 MASK
0.0015%
84
PancakeSwap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.42
0.0009037 Eth
$658.80
271.710 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0011%
85
Mercado Bitcoin
MASK-BRL$2.19
0.0008185 Eth
$584.73
266.855 MASK
0.0011%
86
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.32
0.0008642 Eth
$555.99
239.941 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0010%
87
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.37
0.0008853 Eth
$469.75
198.961 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0008%
88
TokoCrypto
MASK-USDT$2.38
0.0008895 Eth
$448.62
188.622 MASK
0.0008%
89
Nominex
MASK-BNB$2.39
0.0008916 Eth
$243.13
101.858 MASK
0.0004%
90
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.37
0.0008830 Eth
$177.69
70.366 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0003%
91
Indodax
MASK-IDR$2.22
0.0008285 Eth
$157.55
70.973 MASK
0.0003%
92
Nominex
MASK-TRY$2.39
0.0008918 Eth
$85.45
35.775 MASK
0.0001%
93
Bittime
MASK-IDR$2.39
0.0008938 Eth
$52.69
21.940 MASK
0.0001%
94
OKCoin Japan
MASK-JPY$2.36
0.0008803 Eth
$48.96
20.483 MASK
0.0001%
95
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$2.39
0.0008903 Eth
$35.93
14.953 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0001%
96
CEX.IO
MASK-USD$2.39
0.0008929 Eth
$27.80
11.715 MASK
0.0000%
97
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$2.35
0.0008755 Eth
$20.74
8.839 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
98
Gate.io
MASK-ETH$2.38
0.0008906 Eth
$18.99
7.972 MASK
0.0000%
99
CEX.IO
MASK-USDT$2.39
0.0008922 Eth
$17.48
7.399 MASK
0.0000%
100
CoinDCX
MASK-INR$2.47
0.0009219 Eth
$12.98
0.000 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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