ETH Price: $3,338.90 (-1.07%)

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,965 (0.00%)

Market

Price

$2.98 @ 0.000893 ETH (+0.46%)

Onchain Market Cap

$298,000,000.00

Circulating Supply Market Cap

$298,335,829.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
5,484.364055400696931365 MASK

Value
$16,343.40 ( ~4.8948 Eth) [0.0055%]
0x51c72848c68a965f66fa7a88855f9f7784502a7f
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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):$81,097,955.00
Market Capitalization:$298,335,829.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
BTCC
MASK-USDT$2.98
0.0008911 Eth
$24,437,317.00
8,145,438.800 MASK
32.7887%
2
Bitrue
MASK-USDT$2.97
0.0008905 Eth
$15,019,027.00
5,051,057.000 MASK
20.3325%
3
Bibox
MASK-USDT$2.99
0.0008961 Eth
$5,499,367.00
1,837,975.000 MASK
7.3986%
4
Binance
MASK-USDT$2.98
0.0008924 Eth
$5,311,478.00
1,765,083.500 MASK
7.1052%
5
Upbit
MASK-KRW$3.03
0.0009087 Eth
$4,950,911.00
1,631,628.176 MASK
6.5680%
6
LBank
MASK-USDT$2.97
0.0008908 Eth
$4,585,072.00
1,541,509.270 MASK
6.2052%
7
Websea
MASK-USDT$2.97
0.0008902 Eth
$1,937,039.00
0.000 MASK
0.0000%
8
HTX
MASK-USDT$2.97
0.0008905 Eth
$1,780,465.00
594,214.551 MASK
2.3920%
9
Bitget
MASK-USDT$2.97
0.0008908 Eth
$1,517,985.00
506,183.208 MASK
2.0376%
10
OKX
MASK-USDT$2.97
0.0008890 Eth
$1,163,736.00
386,105.566 MASK
1.5542%
11
Bybit
MASK-USDT$2.98
0.0008911 Eth
$1,135,475.00
376,114.130 MASK
1.5140%
12
BYDFi
MASK-USDT$2.99
0.0008944 Eth
$1,117,061.00
373,925.700 MASK
1.5052%
13
Hotcoin
MASK-USDT$2.98
0.0008922 Eth
$1,090,899.00
366,156.600 MASK
1.4739%
14
Trubit
MASK-USDT$2.98
0.0008932 Eth
$980,641.00
327,308.700 MASK
1.3175%
15
WhiteBIT
MASK-USDT$2.97
0.0008916 Eth
$948,470.00
318,951.438 MASK
1.2839%
16
Bithumb
MASK-KRW$3.05
0.0009120 Eth
$932,059.00
306,075.257 MASK
1.2321%
17
Deepcoin
MASK-USDT$2.97
0.0008905 Eth
$931,131.00
314,668.000 MASK
1.2667%
18
Biconomy.com
MASK-USDT$2.99
0.0008949 Eth
$747,807.00
249,364.524 MASK
1.0038%
19
Gate.io
MASK-USDT$2.98
0.0008920 Eth
$681,343.00
225,852.240 MASK
0.9091%
20
CoinW
MASK-USDT$2.98
0.0008910 Eth
$574,194.00
192,984.997 MASK
0.7768%
21
Toobit
MASK-USDT$2.97
0.0008907 Eth
$558,433.00
185,638.870 MASK
0.7473%
22
Binance
MASK-TRY$3.00
0.0008973 Eth
$492,702.00
163,484.800 MASK
0.6581%
23
Bitunix
MASK-USDT$2.98
0.0008916 Eth
$426,557.00
143,220.400 MASK
0.5765%
24
Ourbit
MASK-USDT$2.97
0.0008907 Eth
$410,461.00
136,445.480 MASK
0.5492%
25
OrangeX
MASK-USDT$2.98
0.0008916 Eth
$397,310.00
132,122.450 MASK
0.5318%
26
MEXC
MASK-USDT$2.98
0.0008910 Eth
$319,983.00
107,545.430 MASK
0.4329%
27
KuCoin
MASK-USDT$2.98
0.0008912 Eth
$271,265.00
91,158.815 MASK
0.3670%
28
BitDelta
MASK-USDT$2.98
0.0008917 Eth
$248,636.00
82,969.100 MASK
0.3340%
29
Phemex
MASK-USDT$2.96
0.0008870 Eth
$224,435.00
75,805.580 MASK
0.3051%
30
BIT
MASK-USDT$2.99
0.0008937 Eth
$210,270.00
70,433.288 MASK
0.2835%
31
Icrypex
MASK-USDT$2.96
0.0008855 Eth
$203,282.00
68,737.020 MASK
0.2767%
32
BtcTurk | Kripto
MASK-TRY$3.01
0.0009001 Eth
$177,301.00
58,992.920 MASK
0.2375%
33
Dex-Trade
MASK-USDT$2.98
0.0008925 Eth
$173,709.00
58,285.300 MASK
0.2346%
34
CoinTR
MASK-TRY$3.00
0.0008982 Eth
$168,718.00
55,928.600 MASK
0.2251%
35
Byte Exchange
MASK-USDT$2.97
0.0008898 Eth
$165,936.00
55,841.854 MASK
0.2248%
36
CoinTR
MASK-USDT$2.98
0.0008916 Eth
$149,818.00
49,996.400 MASK
0.2013%
37
BVOX
MASK-USDT$2.98
0.0008916 Eth
$148,169.00
49,418.700 MASK
0.1989%
38
Coinbase Exchange
MASK-USD$2.99
0.0008954 Eth
$147,946.00
49,480.300 MASK
0.1992%
39
Hibt
MASK-USDT$2.98
0.0008917 Eth
$138,943.00
46,104.479 MASK
0.1856%
40
AscendEX (BitMax)
MASK-USDT$2.98
0.0008938 Eth
$133,675.00
44,791.000 MASK
0.1803%
41
DigiFinex
MASK-USDT$2.98
0.0008912 Eth
$130,765.00
43,940.198 MASK
0.1769%
42
Tapbit
MASK-USDT$2.98
0.0008910 Eth
$129,955.00
43,298.900 MASK
0.1743%
43
ProBit Global
MASK-USDT$2.97
0.0008911 Eth
$127,263.00
42,785.000 MASK
0.1722%
44
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.98
0.0008917 Eth
$123,262.00
41,098.443 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1654%
45
FameEX
MASK-USDT$2.98
0.0008919 Eth
$112,377.00
37,356.500 MASK
0.1504%
46
BitMart
MASK-USDT$2.97
0.0008908 Eth
$107,885.00
36,270.180 MASK
0.1460%
47
BingX
MASK-USDT$2.97
0.0008908 Eth
$103,611.00
34,468.451 MASK
0.1387%
48
PointPay
MASK-USDT$2.99
0.0008941 Eth
$87,427.00
29,041.626 MASK
0.1169%
49
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.98
0.0008923 Eth
$81,397.00
27,102.544 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1091%
50
Binance
MASK-BNB$3.00
0.0008993 Eth
$68,289.00
22,774.200 MASK
0.0917%
51
BTSE
MASK-USDT$2.97
0.0008908 Eth
$64,574.00
21,708.722 MASK
0.0874%
52
BloFin
MASK-USDT$2.98
0.0008922 Eth
$56,104.00
18,694.800 MASK
0.0753%
53
Kraken
MASK-USD$3.00
0.0008988 Eth
$55,561.00
18,514.325 MASK
0.0745%
54
Koinpark
MASK-USDT$2.98
0.0008913 Eth
$48,406.00
16,263.612 MASK
0.0655%
55
BtcTurk | Kripto
MASK-USDT$3.00
0.0008994 Eth
$46,409.00
15,452.600 MASK
0.0622%
56
CoinEx
MASK-USDT$2.97
0.0008888 Eth
$44,671.00
14,924.350 MASK
0.0601%
57
Bitbank
MASK-JPY$2.99
0.0008960 Eth
$43,675.00
14,598.634 MASK
0.0588%
58
Bitvavo
MASK-EUR$2.95
0.0008844 Eth
$38,875.00
13,163.014 MASK
0.0530%
59
Paribu
MASK-TRY$3.04
0.0009114 Eth
$23,943.00
7,867.310 MASK
0.0317%
60
Tothemoon
MASK-USDT$2.98
0.0008934 Eth
$23,432.00
7,854.000 MASK
0.0316%
61
LATOKEN
MASK-USDT$2.98
0.0008910 Eth
$18,026.40
6,058.473 MASK
0.0244%
62
Bitci TR
MASK-TRY$2.98
0.0008910 Eth
$17,492.75
5,796.210 MASK
0.0233%
63
Pionex
MASK-USDT$2.98
0.0008938 Eth
$16,052.89
5,333.102 MASK
0.0215%
64
bitcastle
MASK-USDT$2.99
0.0008937 Eth
$11,949.20
3,965.600 MASK
0.0160%
65
Coinbase Exchange
MASK-USDT$2.98
0.0008911 Eth
$10,509.39
3,531.880 MASK
0.0142%
66
Vindax
MASK-USDT$2.99
0.0008950 Eth
$9,430.46
3,153.500 MASK
0.0127%
67
Coinbase Exchange
MASK-EUR$3.02
0.0009054 Eth
$7,564.41
2,501.960 MASK
0.0101%
68
Kanga
MASK-USDT$2.98
0.0008913 Eth
$7,392.87
0.000 MASK
0.0000%
69
Bitlo
MASK-TRY$3.00
0.0008980 Eth
$7,283.37
2,409.675 MASK
0.0097%
70
Crypto.com Exchange
MASK-USDT$2.98
0.0008928 Eth
$5,712.27
1,916.300 MASK
0.0077%
71
Mudrex
MASK-USDT$2.97
0.0008896 Eth
$3,937.47
1,325.550 MASK
0.0053%
72
Gemini
MASK-USD$2.97
0.0008889 Eth
$3,587.62
1,208.767 MASK
0.0049%
73
Nami.Exchange
MASK-VNST$2.99
0.0008963 Eth
$3,443.70
1,150.704 MASK
0.0046%
74
Nami.Exchange
MASK-USDT$2.98
0.0008914 Eth
$3,397.01
1,141.333 MASK
0.0046%
75
Kraken
MASK-EUR$3.02
0.0009045 Eth
$3,352.56
1,110.020 MASK
0.0045%
76
OKX
MASK-USDC$3.00
0.0008979 Eth
$3,313.56
1,098.048 MASK
0.0044%
77
Bit2Me
MASK-EUR$3.02
0.0009045 Eth
$3,285.51
1,087.820 MASK
0.0044%
78
Uniswap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XC02AAA39B223FE8D0A0E5C4F27EAD9083C756CC2$3.03
0.0009061 Eth
$3,113.24
1,043.108 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0042%
79
Coinbase Exchange
MASK-GBP$3.01
0.0009010 Eth
$2,867.14
953.020 MASK
0.0038%
80
Upbit
MASK-BTC$2.91
0.0008730 Eth
$2,762.21
947.596 MASK
0.0038%
81
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.98
0.0008925 Eth
$2,739.21
912.093 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0037%
82
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.99
0.0008966 Eth
$2,350.34
815.678 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0033%
83
Dex-Trade
MASK-BNB$3.02
0.0009031 Eth
$2,305.11
764.500 MASK
0.0031%
84
WEEX
MASK-USDT$2.97
0.0008908 Eth
$1,903.95
634.100 MASK
0.0026%
85
Crypto.com Exchange
MASK-USD$3.02
0.0009038 Eth
$1,164.91
386.000 MASK
0.0016%
86
OKCoin Japan
MASK-JPY$3.00
0.0008987 Eth
$1,003.64
332.495 MASK
0.0013%
87
Binance US
MASK-USDT$2.95
0.0008847 Eth
$804.19
272.185 MASK
0.0011%
88
PancakeSwap V3 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$3.02
0.0009037 Eth
$537.13
178.687 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0007%
89
Coinone
MASK-KRW$3.10
0.0009287 Eth
$474.07
152.884 MASK
0.0006%
90
Bittime
MASK-IDR$3.01
0.0009022 Eth
$266.35
87.880 MASK
0.0004%
91
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$3.01
0.0009003 Eth
$226.93
77.894 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0003%
92
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.99
0.0008963 Eth
$135.36
46.052 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0002%
93
Indodax
MASK-IDR$3.06
0.0009150 Eth
$64.64
21.156 MASK
0.0001%
94
Bancor (V2)
MASK-BNT$3.33
0.0009960 Eth
$54.77
16.472 MASK
0.0001%
95
CEX.IO
MASK-USD$2.98
0.0008916 Eth
$53.95
18.136 MASK
0.0001%
96
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$3.02
0.0009037 Eth
$53.41
17.695 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0001%
97
CEX.IO
MASK-USDT$2.98
0.0008919 Eth
$45.80
15.469 MASK
0.0001%
98
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$3.01
0.0009012 Eth
$20.31
6.817 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0000%
99
TokoCrypto
MASK-USDT$2.97
0.0008899 Eth
$11.47
3.863 MASK
0.0000%
100
Mercado Bitcoin
MASK-BRL$3.35
0.0010031 Eth
$11.45
3.420 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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