ETH Price: $3,197.44 (+0.82%)

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,855 ( -0.029%)

Market

Price

$2.93 @ 0.000916 ETH (+4.52%)

Onchain Market Cap

$293,000,000.00

Circulating Supply Market Cap

$292,503,155.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
0.000000000000000001 MASK

Value
$0.00 ( ~0 Eth) [0.0000%]
0x12cff71edfc4e16eec6373f1fb37c5cf3ca71c19
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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):$320,831,147.00
Market Capitalization:$292,503,155.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
BTCC
MASK-USDT$2.93
0.0009123 Eth
$56,586,844.00
19,642,266.200 MASK
18.1082%
2
Bitrue
MASK-USDT$2.93
0.0009120 Eth
$46,398,565.00
15,845,187.600 MASK
14.6077%
3
Binance
MASK-USDT$2.90
0.0009027 Eth
$41,353,988.00
14,363,906.500 MASK
13.2421%
4
Upbit
MASK-KRW$2.94
0.0009152 Eth
$28,630,412.00
9,737,424.819 MASK
8.9769%
5
OKX
MASK-USDT$2.91
0.0009048 Eth
$15,341,186.00
5,295,486.453 MASK
4.8819%
6
Bibox
MASK-USDT$2.94
0.0009173 Eth
$12,473,977.00
4,235,926.000 MASK
3.9051%
7
Gate.io
MASK-USDT$2.92
0.0009081 Eth
$11,419,688.00
3,950,180.990 MASK
3.6417%
8
Bybit
MASK-USDT$2.91
0.0009047 Eth
$9,082,665.00
3,143,285.770 MASK
2.8978%
9
Bithumb
MASK-KRW$2.93
0.0009121 Eth
$8,888,814.00
3,033,389.978 MASK
2.7965%
10
BYDFi
MASK-USDT$2.92
0.0009107 Eth
$7,354,418.00
2,517,634.100 MASK
2.3210%
11
Bitunix
MASK-USDT$2.93
0.0009123 Eth
$6,640,583.00
2,268,347.240 MASK
2.0912%
12
Hotcoin
MASK-USDT$2.91
0.0009039 Eth
$6,365,938.00
2,188,106.300 MASK
2.0172%
13
Nami.Exchange
MASK-USDT$2.93
0.0009129 Eth
$6,356,055.00
2,170,712.300 MASK
2.0012%
14
Nami.Exchange
MASK-VNST$2.91
0.0009064 Eth
$5,659,891.00
1,945,999.900 MASK
1.7940%
15
Websea
MASK-USDT$2.93
0.0009113 Eth
$5,609,464.00
0.000 MASK
0.0000%
16
MEXC
MASK-USDT$2.91
0.0009056 Eth
$5,588,265.00
1,920,872.990 MASK
1.7709%
17
HTX
MASK-USDT$2.92
0.0009088 Eth
$4,150,032.00
1,436,492.453 MASK
1.3243%
18
WhiteBIT
MASK-USDT$2.92
0.0009094 Eth
$4,048,158.00
1,385,337.149 MASK
1.2771%
19
Toobit
MASK-USDT$2.92
0.0009081 Eth
$3,934,499.00
1,363,525.280 MASK
1.2570%
20
Ourbit
MASK-USDT$2.91
0.0009051 Eth
$2,920,830.00
1,013,937.170 MASK
0.9347%
21
BtcTurk | Kripto
MASK-TRY$2.90
0.0009009 Eth
$2,521,241.00
868,433.200 MASK
0.8006%
22
Deepcoin
MASK-USDT$2.92
0.0009113 Eth
$2,264,589.00
909,360.643 MASK
0.8383%
23
Bitget
MASK-USDT$2.90
0.0009042 Eth
$2,125,717.00
734,853.140 MASK
0.6775%
24
Biconomy.com
MASK-USDT$2.92
0.0009102 Eth
$2,096,874.00
726,397.785 MASK
0.6697%
25
Binance
MASK-TRY$2.92
0.0009073 Eth
$1,660,255.00
572,848.800 MASK
0.5281%
26
BTSE
MASK-USDT$2.92
0.0009097 Eth
$1,540,048.00
526,827.815 MASK
0.4857%
27
LBank
MASK-USDT$2.91
0.0009045 Eth
$1,350,219.00
464,680.510 MASK
0.4284%
28
DigiFinex
MASK-USDT$2.91
0.0009059 Eth
$1,159,685.00
398,485.279 MASK
0.3674%
29
bitcastle
MASK-USDT$2.92
0.0009098 Eth
$1,130,108.00
391,147.100 MASK
0.3606%
30
KuCoin
MASK-USDT$2.92
0.0009107 Eth
$1,045,875.00
357,706.885 MASK
0.3298%
31
Dex-Trade
MASK-USDT$2.92
0.0009075 Eth
$1,014,835.00
347,994.200 MASK
0.3208%
32
Trubit
MASK-USDT$2.91
0.0009054 Eth
$998,562.00
344,059.100 MASK
0.3172%
33
Phemex
MASK-USDT$2.92
0.0009110 Eth
$979,117.00
335,069.061 MASK
0.3089%
34
FameEX
MASK-USDT$2.91
0.0009036 Eth
$890,815.00
310,051.700 MASK
0.2858%
35
OrangeX
MASK-USDT$2.93
0.0009138 Eth
$878,080.00
304,913.390 MASK
0.2811%
36
Byte Exchange
MASK-USDT$2.93
0.0009120 Eth
$811,846.00
277,537.500 MASK
0.2559%
37
CoinW
MASK-USDT$2.92
0.0009089 Eth
$666,740.00
228,610.226 MASK
0.2108%
38
PointPay
MASK-USDT$2.92
0.0009110 Eth
$629,208.00
217,758.243 MASK
0.2008%
39
Bitvavo
MASK-EUR$2.90
0.0009025 Eth
$602,356.00
207,995.321 MASK
0.1918%
40
BingX
MASK-USDT$2.91
0.0009053 Eth
$559,222.00
193,709.659 MASK
0.1786%
41
Paribu
MASK-TRY$2.92
0.0009086 Eth
$550,979.00
188,977.860 MASK
0.1742%
42
Coinbase Exchange
MASK-USD$2.92
0.0009096 Eth
$414,620.00
141,993.230 MASK
0.1309%
43
BtcTurk | Kripto
MASK-USDT$2.92
0.0009094 Eth
$408,910.00
140,065.290 MASK
0.1291%
44
BIT
MASK-USDT$2.92
0.0009105 Eth
$400,819.00
137,173.873 MASK
0.1265%
45
BitMart
MASK-USDT$2.92
0.0009104 Eth
$378,462.00
129,480.160 MASK
0.1194%
46
Koinpark
MASK-USDT$2.92
0.0009110 Eth
$375,931.00
128,647.793 MASK
0.1186%
47
Tapbit
MASK-USDT$2.92
0.0009096 Eth
$354,419.00
122,644.700 MASK
0.1131%
48
Icrypex
MASK-USDT$2.91
0.0009070 Eth
$350,449.00
120,463.960 MASK
0.1111%
49
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.92
0.0009100 Eth
$322,506.00
111,848.122 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1031%
50
BitDelta
MASK-USDT$2.90
0.0009033 Eth
$322,306.00
111,916.300 MASK
0.1032%
51
Bitbank
MASK-JPY$2.93
0.0009116 Eth
$291,226.00
99,507.706 MASK
0.0917%
52
CoinEx
MASK-USDT$2.92
0.0009082 Eth
$280,456.00
95,964.851 MASK
0.0885%
53
Pionex
MASK-USDT$2.92
0.0009110 Eth
$275,028.00
95,490.717 MASK
0.0880%
54
ProBit Global
MASK-USDT$2.92
0.0009091 Eth
$242,885.00
83,280.576 MASK
0.0768%
55
CoinTR
MASK-TRY$2.92
0.0009118 Eth
$165,701.00
57,221.400 MASK
0.0528%
56
BloFin
MASK-USDT$2.92
0.0009096 Eth
$158,257.00
54,958.400 MASK
0.0507%
57
AscendEX (BitMax)
MASK-USDT$2.93
0.0009131 Eth
$141,274.00
48,192.600 MASK
0.0444%
58
CoinTR
MASK-USDT$2.92
0.0009101 Eth
$135,754.00
46,972.800 MASK
0.0433%
59
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.91
0.0009062 Eth
$135,672.00
47,061.093 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0434%
60
Vindax
MASK-USDT$2.90
0.0009033 Eth
$125,893.00
43,434.100 MASK
0.0400%
61
Kraken
MASK-USD$2.92
0.0009083 Eth
$119,767.00
41,072.523 MASK
0.0379%
62
Binance
MASK-BNB$2.91
0.0009060 Eth
$114,026.00
38,373.000 MASK
0.0354%
63
LATOKEN
MASK-USDT$2.92
0.0009094 Eth
$90,977.00
31,132.515 MASK
0.0287%
64
OKX
MASK-USDC$2.91
0.0009052 Eth
$85,127.00
29,571.853 MASK
0.0273%
65
Nominex
MASK-USDT$2.91
0.0009067 Eth
$48,003.00
16,472.441 MASK
0.0152%
66
TokoCrypto
MASK-USDT$2.91
0.0009048 Eth
$36,230.00
12,461.232 MASK
0.0115%
67
Coinbase Exchange
MASK-GBP$2.91
0.0009063 Eth
$34,233.00
11,766.980 MASK
0.0108%
68
Crypto.com Exchange
MASK-USD$2.92
0.0009091 Eth
$31,852.00
10,903.700 MASK
0.0101%
69
Coinone
MASK-KRW$2.96
0.0009221 Eth
$28,103.00
9,485.014 MASK
0.0087%
70
Coinbase Exchange
MASK-USDT$2.91
0.0009079 Eth
$26,260.00
9,010.080 MASK
0.0083%
71
Crypto.com Exchange
MASK-USDT$2.92
0.0009084 Eth
$26,228.00
8,985.300 MASK
0.0083%
72
Max Maicoin
MASK-USDT$2.92
0.0009090 Eth
$24,891.00
8,537.200 MASK
0.0079%
73
Coinbase Exchange
MASK-EUR$2.90
0.0009036 Eth
$24,251.00
8,360.720 MASK
0.0077%
74
Cryptology
MASK-USDT$2.92
0.0009083 Eth
$23,339.00
8,004.200 MASK
0.0074%
75
WEEX
MASK-USDT$2.93
0.0009117 Eth
$20,277.00
7,023.000 MASK
0.0065%
76
Gemini
MASK-USD$2.92
0.0009075 Eth
$18,756.36
6,432.222 MASK
0.0059%
77
Bitci TR
MASK-TRY$2.94
0.0009121 Eth
$15,527.36
5,369.342 MASK
0.0049%
78
Kanga
MASK-USDT$2.91
0.0009051 Eth
$15,517.46
0.000 MASK
0.0000%
79
Kraken
MASK-EUR$2.91
0.0009077 Eth
$9,604.08
3,295.540 MASK
0.0030%
80
Bit2Me
MASK-EUR$2.91
0.0009085 Eth
$9,216.84
3,229.629 MASK
0.0030%
81
Bitlo
MASK-TRY$2.93
0.0009112 Eth
$8,479.39
2,947.551 MASK
0.0027%
82
Upbit
MASK-BTC$2.88
0.0008967 Eth
$8,078.41
2,804.210 MASK
0.0026%
83
Binance US
MASK-USDT$2.88
0.0008982 Eth
$7,779.69
2,700.242 MASK
0.0025%
84
OKCoin Japan
MASK-JPY$2.95
0.0009160 Eth
$6,900.87
2,383.101 MASK
0.0022%
85
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.92
0.0009097 Eth
$6,467.67
2,246.454 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0021%
86
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$2.94
0.0009167 Eth
$4,791.92
1,650.396 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0015%
87
PancakeSwap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.89
0.0009009 Eth
$3,697.19
1,281.897 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0012%
88
Dex-Trade
MASK-BNB$2.95
0.0009177 Eth
$3,111.72
1,054.400 MASK
0.0010%
89
Gate.io
MASK-TRY$2.91
0.0009065 Eth
$2,149.71
730.282 MASK
0.0007%
90
Bittime
MASK-IDR$2.91
0.0009079 Eth
$2,053.07
704.810 MASK
0.0006%
91
Nominex
MASK-TRY$2.92
0.0009062 Eth
$1,888.08
646.776 MASK
0.0006%
92
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.92
0.0009090 Eth
$1,643.65
543.704 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0005%
93
Indodax
MASK-IDR$2.95
0.0009189 Eth
$776.40
263.373 MASK
0.0002%
94
CEX.IO
MASK-USD$2.91
0.0009046 Eth
$343.48
117.620 MASK
0.0001%
95
Gate.io
MASK-ETH$2.90
0.0009022 Eth
$310.20
106.941 MASK
0.0001%
96
CEX.IO
MASK-USDT$2.92
0.0009098 Eth
$228.05
77.866 MASK
0.0001%
97
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$2.90
0.0009052 Eth
$131.30
44.518 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0000%
98
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$2.92
0.0009087 Eth
$131.02
44.123 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
99
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.92
0.0009092 Eth
$130.03
44.239 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0000%
100
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$2.91
0.0009083 Eth
$15.63
5.540 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
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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