ETH Price: $3,615.11 (+5.65%)
Gas: 8.49 Gwei

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,899 ( 0.058%)

Market

Price

$3.53 @ 0.000976 ETH (+1.31%)

Onchain Market Cap

$353,000,000.00

Circulating Supply Market Cap

$354,052,718.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0 MASK

Value
$0.00
0x22f7d931e384f981430ee6b691d8cb011074656c
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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):$430,171,641.00
Market Capitalization:$354,052,718.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
Upbit
MASK-KRW$3.54
0.0009794 Eth
$73,440,762.00
20,753,046.505 MASK
18.2156%
2
BTCC
MASK-USDT$3.53
0.0009753 Eth
$61,703,071.00
17,463,444.700 MASK
15.3283%
3
Bitrue
MASK-USDT$3.54
0.0009786 Eth
$48,967,379.00
13,847,948.600 MASK
12.1548%
4
Binance
MASK-USDT$3.52
0.0009719 Eth
$47,418,441.00
13,345,121.200 MASK
11.7135%
5
Websea
MASK-USDT$3.53
0.0009747 Eth
$27,052,967.00
0.000 MASK
0.0000%
6
OKX
MASK-USDT$3.55
0.0009826 Eth
$21,766,448.00
6,152,944.511 MASK
5.4006%
7
Nami.Exchange
MASK-VNST$3.55
0.0009816 Eth
$11,943,375.00
3,363,054.300 MASK
2.9519%
8
Nami.Exchange
MASK-USDT$3.53
0.0009781 Eth
$11,784,327.00
3,334,473.800 MASK
2.9268%
9
Gate.io
MASK-USDT$3.54
0.0009792 Eth
$9,995,203.00
2,816,259.140 MASK
2.4719%
10
Bybit
MASK-USDT$3.55
0.0009835 Eth
$9,843,877.00
2,770,758.450 MASK
2.4320%
11
Bithumb
MASK-KRW$3.53
0.0009758 Eth
$8,818,586.00
2,501,154.899 MASK
2.1953%
12
LBank
MASK-USDT$3.53
0.0009758 Eth
$8,692,305.00
2,464,071.190 MASK
2.1628%
13
BYDFi
MASK-USDT$3.54
0.0009826 Eth
$8,643,041.00
2,443,156.000 MASK
2.1444%
14
MEXC
MASK-USDT$3.54
0.0009814 Eth
$7,994,710.00
2,259,965.090 MASK
1.9836%
15
Bitunix
MASK-USDT$3.52
0.0009745 Eth
$7,563,177.00
2,146,392.840 MASK
1.8840%
16
WhiteBIT
MASK-USDT$3.52
0.0009750 Eth
$6,721,190.00
1,906,953.717 MASK
1.6738%
17
Toobit
MASK-USDT$3.53
0.0009754 Eth
$4,589,838.00
1,292,746.840 MASK
1.1347%
18
Bibox
MASK-USDT$3.56
0.0009845 Eth
$3,839,533.00
1,079,196.000 MASK
0.9472%
19
Deepcoin
MASK-USDT$3.53
0.0009761 Eth
$3,694,182.00
1,074,099.071 MASK
0.9428%
20
Hotcoin
MASK-USDT$3.53
0.0009758 Eth
$3,691,180.00
1,045,757.800 MASK
0.9179%
21
Ourbit
MASK-USDT$3.55
0.0009835 Eth
$3,194,995.00
901,120.130 MASK
0.7909%
22
KuCoin
MASK-USDT$3.54
0.0009789 Eth
$2,844,766.00
804,357.770 MASK
0.7060%
23
HTX
MASK-USDT$3.56
0.0009850 Eth
$2,835,570.00
807,361.692 MASK
0.7086%
24
Bitget
MASK-USDT$3.56
0.0009851 Eth
$2,759,201.00
780,457.145 MASK
0.6850%
25
BtcTurk | Kripto
MASK-TRY$3.53
0.0009767 Eth
$2,695,797.00
763,153.370 MASK
0.6698%
26
Biconomy.com
MASK-USDT$3.56
0.0009852 Eth
$2,346,321.00
664,047.322 MASK
0.5829%
27
Binance
MASK-TRY$3.55
0.0009837 Eth
$1,759,232.00
495,350.500 MASK
0.4348%
28
Hibt
MASK-USDT$3.54
0.0009789 Eth
$1,622,003.00
458,365.076 MASK
0.4023%
29
DigiFinex
MASK-USDT$3.56
0.0009844 Eth
$1,571,410.00
441,790.768 MASK
0.3878%
30
Coinbase Exchange
MASK-USD$3.53
0.0009770 Eth
$1,485,420.00
420,798.760 MASK
0.3693%
31
BTSE
MASK-USDT$3.54
0.0009792 Eth
$1,461,044.00
412,938.258 MASK
0.3624%
32
bitcastle
MASK-USDT$3.53
0.0009763 Eth
$1,413,007.00
397,862.300 MASK
0.3492%
33
Dex-Trade
MASK-USDT$3.54
0.0009807 Eth
$1,249,560.00
352,600.342 MASK
0.3095%
34
FameEX
MASK-USDT$3.54
0.0009821 Eth
$970,043.00
273,187.400 MASK
0.2398%
35
Bitvavo
MASK-EUR$3.50
0.0009670 Eth
$969,721.00
277,346.120 MASK
0.2434%
36
Trubit
MASK-USDT$3.53
0.0009781 Eth
$963,876.00
275,302.600 MASK
0.2416%
37
OrangeX
MASK-USDT$3.56
0.0009855 Eth
$875,281.00
247,075.170 MASK
0.2169%
38
Phemex
MASK-USDT$3.52
0.0009776 Eth
$816,057.00
231,857.758 MASK
0.2035%
39
PointPay
MASK-USDT$3.54
0.0009805 Eth
$781,016.00
219,877.625 MASK
0.1930%
40
BtcTurk | Kripto
MASK-USDT$3.54
0.0009784 Eth
$680,293.00
192,440.800 MASK
0.1689%
41
CoinW
MASK-USDT$3.53
0.0009752 Eth
$665,357.00
188,610.997 MASK
0.1656%
42
BingX
MASK-USDT$3.56
0.0009849 Eth
$631,696.00
178,315.283 MASK
0.1565%
43
Paribu
MASK-TRY$3.51
0.0009710 Eth
$581,684.00
165,602.730 MASK
0.1454%
44
CoinEx
MASK-USDT$3.52
0.0009743 Eth
$499,916.00
141,516.899 MASK
0.1242%
45
BIT
MASK-USDT$3.55
0.0009827 Eth
$459,665.00
129,457.321 MASK
0.1136%
46
Bitbank
MASK-JPY$3.54
0.0009787 Eth
$446,321.00
126,227.169 MASK
0.1108%
47
Koinpark
MASK-USDT$3.53
0.0009748 Eth
$432,328.00
122,611.427 MASK
0.1076%
48
Icrypex
MASK-USDT$3.55
0.0009812 Eth
$385,976.00
108,853.578 MASK
0.0955%
49
BitMart
MASK-USDT$3.54
0.0009794 Eth
$385,064.00
108,821.500 MASK
0.0955%
50
BitDelta
MASK-USDT$3.54
0.0009802 Eth
$341,293.00
97,231.600 MASK
0.0853%
51
Tapbit
MASK-USDT$3.53
0.0009755 Eth
$335,782.00
94,951.600 MASK
0.0833%
52
OKX
MASK-USDC$3.54
0.0009791 Eth
$281,088.00
79,430.028 MASK
0.0697%
53
BVOX
MASK-USDT$3.53
0.0009758 Eth
$277,164.00
79,136.800 MASK
0.0695%
54
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$3.56
0.0009858 Eth
$241,742.00
68,289.883 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0599%
55
Binance
MASK-BNB$3.55
0.0009817 Eth
$230,102.00
63,551.600 MASK
0.0558%
56
Kraken
MASK-USD$3.54
0.0009797 Eth
$211,939.00
59,869.759 MASK
0.0525%
57
CoinTR
MASK-TRY$3.56
0.0009858 Eth
$190,869.00
54,562.700 MASK
0.0479%
58
Pionex
MASK-USDT$3.54
0.0009795 Eth
$185,809.00
52,152.461 MASK
0.0458%
59
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$3.52
0.0009755 Eth
$172,236.00
48,686.872 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0427%
60
Coinbase Exchange
MASK-USDT$3.55
0.0009828 Eth
$154,776.00
43,586.070 MASK
0.0383%
61
ProBit Global
MASK-USDT$3.52
0.0009745 Eth
$154,073.00
43,757.399 MASK
0.0384%
62
CoinTR
MASK-USDT$3.56
0.0009849 Eth
$149,414.00
42,710.000 MASK
0.0375%
63
BloFin
MASK-USDT$3.54
0.0009803 Eth
$145,400.00
41,343.400 MASK
0.0363%
64
AscendEX (BitMax)
MASK-USDT$3.56
0.0009846 Eth
$140,244.00
39,419.700 MASK
0.0346%
65
Max Maicoin
MASK-USDT$3.56
0.0009854 Eth
$126,378.00
35,478.800 MASK
0.0311%
66
LATOKEN
MASK-USDT$3.54
0.0009829 Eth
$115,175.00
32,538.309 MASK
0.0286%
67
Byte Exchange
MASK-USDT$3.52
0.0009733 Eth
$111,827.00
31,762.954 MASK
0.0279%
68
Crypto.com Exchange
MASK-USDT$3.50
0.0009678 Eth
$108,506.00
31,028.500 MASK
0.0272%
69
Vindax
MASK-USDT$3.53
0.0009767 Eth
$103,334.00
29,281.300 MASK
0.0257%
70
Coinbase Exchange
MASK-EUR$3.53
0.0009775 Eth
$50,883.00
14,407.320 MASK
0.0126%
71
Coinbase Exchange
MASK-GBP$3.55
0.0009836 Eth
$39,202.00
11,030.630 MASK
0.0097%
72
Crypto.com Exchange
MASK-USD$3.54
0.0009797 Eth
$38,031.00
10,742.800 MASK
0.0094%
73
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$3.55
0.0009837 Eth
$30,358.00
8,296.409 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0073%
74
Coinone
MASK-KRW$3.55
0.0009829 Eth
$28,417.00
8,000.894 MASK
0.0070%
75
Tothemoon
MASK-USDT$3.53
0.0009771 Eth
$27,768.00
7,865.300 MASK
0.0069%
76
WEEX
MASK-USDT$3.53
0.0009760 Eth
$25,591.00
7,322.200 MASK
0.0064%
77
Bitci TR
MASK-TRY$3.57
0.0009868 Eth
$19,941.76
5,696.070 MASK
0.0050%
78
Mudrex
MASK-USDT$3.53
0.0009755 Eth
$18,352.23
5,205.065 MASK
0.0046%
79
TokoCrypto
MASK-USDT$3.53
0.0009756 Eth
$16,748.17
4,750.147 MASK
0.0042%
80
Kraken
MASK-EUR$3.51
0.0009716 Eth
$14,415.35
4,106.135 MASK
0.0036%
81
Bit2Me
MASK-EUR$3.51
0.0009711 Eth
$14,104.82
4,029.715 MASK
0.0035%
82
OKCoin Japan
MASK-JPY$3.56
0.0009840 Eth
$11,649.42
3,221.742 MASK
0.0028%
83
Bitlo
MASK-TRY$3.54
0.0009835 Eth
$11,277.70
3,212.620 MASK
0.0028%
84
Kanga
MASK-USDT$3.52
0.0009738 Eth
$11,176.74
0.000 MASK
0.0000%
85
Gemini
MASK-USD$3.47
0.0009606 Eth
$10,736.23
3,093.124 MASK
0.0027%
86
CEX.IO
MASK-USD$3.54
0.0009782 Eth
$8,551.65
2,332.643 MASK
0.0020%
87
Dex-Trade
MASK-BNB$3.53
0.0009765 Eth
$7,496.81
2,124.700 MASK
0.0019%
88
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$3.51
0.0009712 Eth
$6,876.13
1,882.920 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0017%
89
CEX.IO
MASK-USDT$3.52
0.0009790 Eth
$5,999.18
1,630.812 MASK
0.0014%
90
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$3.52
0.0009739 Eth
$4,904.21
1,393.051 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0012%
91
CoinDCX
MASK-INR$3.46
0.0009584 Eth
$4,173.52
0.000 MASK
0.0000%
92
Binance US
MASK-USDT$3.57
0.0009881 Eth
$3,587.02
1,005.629 MASK
0.0009%
93
Gate.io
MASK-TRY$3.56
0.0009855 Eth
$3,095.81
850.565 MASK
0.0007%
94
Gate.io
MASK-ETH$3.53
0.0009762 Eth
$997.06
275.003 MASK
0.0002%
95
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$3.52
0.0009722 Eth
$910.40
248.807 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0002%
96
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$3.52
0.0009722 Eth
$772.96
209.288 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0002%
97
Bittime
MASK-IDR$3.54
0.0009789 Eth
$425.85
115.470 MASK
0.0001%
98
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$3.52
0.0009743 Eth
$129.80
37.299 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0000%
99
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$3.48
0.0009646 Eth
$122.10
35.041 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0000%
100
Bancor (V2)
MASK-BNT$3.74
0.0010338 Eth
$79.39
21.251 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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