ETH Price: $2,480.44 (-7.26%)

Token

Mask Network (MASK)
 

Overview

Max Total Supply

100,000,000 MASK

Holders

13,960 ( -0.007%)

Market

Price

$2.04 @ 0.000822 ETH (-6.23%)

Onchain Market Cap

$204,000,000.00

Circulating Supply Market Cap

$203,166,303.00

Other Info

Token Contract (WITH 18 Decimals)

Balance
120.1 MASK

Value
$245.00 ( ~0.0987729686329598 Eth) [0.0001%]
0x26bBc5a42D3D95a85EeFdd0Fe7665b9cc3F2110D
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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):$50,436,462.00
Market Capitalization:$203,166,303.00
Circulating Supply:100,000,000.00 MASK
Market Data Source: Coinmarketcap

# Exchange Pair Price  24H Volume % Volume
1
BTCC
MASK-USDT$2.04
0.0008208 Eth
$18,785,248.00
9,067,037.400 MASK
37.5532%
2
Bibox
MASK-USDT$2.05
0.0008250 Eth
$3,586,514.00
1,752,222.000 MASK
7.2572%
3
Binance
MASK-USDT$2.03
0.0008206 Eth
$2,856,781.00
1,384,618.400 MASK
5.7347%
4
HTX
MASK-USDT$2.04
0.0008201 Eth
$2,734,257.00
1,323,862.002 MASK
5.4831%
5
Biconomy.com
MASK-USDT$2.04
0.0008206 Eth
$2,633,896.00
1,273,423.312 MASK
5.2742%
6
Bitrue
MASK-USDT$2.04
0.0008211 Eth
$2,547,343.00
1,250,383.300 MASK
5.1787%
7
OKX
MASK-USDT$2.04
0.0008211 Eth
$1,465,238.00
711,576.733 MASK
2.9472%
8
Bitget
MASK-USDT$2.04
0.0008210 Eth
$1,405,613.00
677,765.583 MASK
2.8071%
9
Nami.Exchange
MASK-VNST$2.05
0.0008253 Eth
$1,378,908.00
674,034.300 MASK
2.7917%
10
Nami.Exchange
MASK-USDT$2.04
0.0008212 Eth
$1,353,092.00
664,703.800 MASK
2.7530%
11
WhiteBIT
MASK-USDT$2.03
0.0008208 Eth
$1,248,765.00
613,754.859 MASK
2.5420%
12
BloFin
MASK-USDT$2.03
0.0008207 Eth
$1,224,557.00
593,226.000 MASK
2.4570%
13
Trubit
MASK-USDT$2.04
0.0008209 Eth
$1,174,373.00
566,915.000 MASK
2.3480%
14
Upbit
MASK-KRW$2.08
0.0008362 Eth
$1,093,309.00
526,876.297 MASK
2.1822%
15
Bybit
MASK-USDT$2.04
0.0008208 Eth
$689,934.00
334,772.740 MASK
1.3865%
16
BYDFi
MASK-USDT$2.04
0.0008209 Eth
$489,036.00
240,046.200 MASK
0.9942%
17
Coinbase Exchange
MASK-USD$2.03
0.0008180 Eth
$477,430.00
235,187.110 MASK
0.9741%
18
Websea
MASK-USDT$2.04
0.0008209 Eth
$441,471.00
0.000 MASK
0.0000%
19
Bitunix
MASK-USDT$2.03
0.0008195 Eth
$437,454.00
215,776.740 MASK
0.8937%
20
LBank
MASK-USDT$2.04
0.0008204 Eth
$390,518.00
191,795.230 MASK
0.7944%
21
Deepcoin
MASK-USDT$2.04
0.0008208 Eth
$381,574.00
188,335.400 MASK
0.7800%
22
Toobit
MASK-USDT$2.04
0.0008213 Eth
$345,238.00
167,168.470 MASK
0.6924%
23
Hotcoin
MASK-USDT$2.04
0.0008209 Eth
$275,545.00
135,253.200 MASK
0.5602%
24
HitBTC
MASK-USDT$2.04
0.0008204 Eth
$205,500.00
99,066.210 MASK
0.4103%
25
FMFW.io
MASK-USDT$2.04
0.0008215 Eth
$201,733.00
99,066.210 MASK
0.4103%
26
BitDelta
MASK-USDT$2.03
0.0008198 Eth
$190,515.00
91,881.100 MASK
0.3805%
27
Icrypex
MASK-USDT$2.06
0.0008306 Eth
$182,803.00
88,684.855 MASK
0.3673%
28
DigiFinex
MASK-USDT$2.04
0.0008202 Eth
$180,455.00
88,651.390 MASK
0.3672%
29
KuCoin
MASK-USDT$2.02
0.0008150 Eth
$179,118.00
88,582.275 MASK
0.3669%
30
FameEX
MASK-USDT$2.04
0.0008200 Eth
$173,224.00
83,936.000 MASK
0.3476%
31
LATOKEN
MASK-USDT$2.04
0.0008200 Eth
$169,954.00
83,510.429 MASK
0.3459%
32
OrangeX
MASK-USDT$2.03
0.0008200 Eth
$160,318.00
77,664.910 MASK
0.3217%
33
Gate.io
MASK-USDT$2.04
0.0008203 Eth
$157,672.00
76,611.160 MASK
0.3173%
34
BIT
MASK-USDT$2.03
0.0008193 Eth
$144,870.00
71,326.887 MASK
0.2954%
35
AscendEX (BitMax)
MASK-USDT$2.04
0.0008223 Eth
$137,992.00
67,634.800 MASK
0.2801%
36
Dex-Trade
MASK-USDT$2.04
0.0008218 Eth
$137,178.00
67,253.300 MASK
0.2785%
37
Tapbit
MASK-USDT$2.03
0.0008211 Eth
$133,837.00
64,617.500 MASK
0.2676%
38
Phemex
MASK-USDT$2.02
0.0008178 Eth
$133,523.00
66,262.016 MASK
0.2744%
39
CoinEx
MASK-USDT$2.03
0.0008168 Eth
$127,898.00
63,241.859 MASK
0.2619%
40
ProBit Global
MASK-USDT$2.02
0.0008131 Eth
$119,034.00
59,008.299 MASK
0.2444%
41
Icrypex
MASK-TRY$2.04
0.0008203 Eth
$118,109.00
58,018.528 MASK
0.2403%
42
BitMart
MASK-USDT$2.03
0.0008182 Eth
$97,155.00
47,858.360 MASK
0.1982%
43
bitcastle
MASK-USDT$2.04
0.0008201 Eth
$84,654.00
41,053.200 MASK
0.1700%
44
BingX
MASK-USDT$2.04
0.0008201 Eth
$80,824.00
39,087.283 MASK
0.1619%
45
BtcTurk | Kripto
MASK-TRY$2.03
0.0008185 Eth
$77,815.00
38,308.020 MASK
0.1587%
46
BTSE
MASK-USDT$2.04
0.0008203 Eth
$69,323.00
34,049.074 MASK
0.1410%
47
Bithumb
MASK-KRW$2.06
0.0008309 Eth
$66,507.00
32,248.227 MASK
0.1336%
48
Kraken
MASK-USD$2.02
0.0008134 Eth
$65,584.00
32,499.719 MASK
0.1346%
49
Bitvavo
MASK-EUR$2.02
0.0008149 Eth
$62,815.00
31,095.192 MASK
0.1288%
50
Max Maicoin
MASK-USDT$2.02
0.0008198 Eth
$62,172.00
30,727.400 MASK
0.1273%
51
Uniswap V2 (Ethereum)
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.03
0.0008190 Eth
$54,102.00
26,104.105 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.1081%
52
Byte Exchange
MASK-USDT$2.04
0.0008209 Eth
$51,654.00
25,354.500 MASK
0.1050%
53
PointPay
MASK-USDT$2.04
0.0008215 Eth
$47,554.00
23,059.764 MASK
0.0955%
54
Dex-Trade
MASK-BNB$2.03
0.0008161 Eth
$45,936.00
22,678.400 MASK
0.0939%
55
CoinW
MASK-USDT$2.03
0.0008197 Eth
$39,068.00
19,205.072 MASK
0.0795%
56
Coinbase Exchange
MASK-EUR$1.98
0.0007993 Eth
$38,859.00
19,590.860 MASK
0.0811%
57
Pionex
MASK-USDT$2.04
0.0008205 Eth
$32,998.00
16,061.996 MASK
0.0665%
58
Binance
MASK-TRY$2.03
0.0008198 Eth
$32,872.00
15,726.500 MASK
0.0651%
59
BtcTurk | Kripto
MASK-USDT$1.99
0.0007999 Eth
$30,512.00
15,370.230 MASK
0.0637%
60
Binance
MASK-BNB$2.03
0.0008165 Eth
$28,747.00
13,967.800 MASK
0.0579%
61
MEXC
MASK-USDT$2.04
0.0008214 Eth
$28,636.00
14,045.890 MASK
0.0582%
62
Coinbase Exchange
MASK-USDT$2.02
0.0008141 Eth
$27,717.00
13,719.630 MASK
0.0568%
63
Bitbank
MASK-JPY$2.03
0.0008163 Eth
$27,082.00
13,368.161 MASK
0.0554%
64
Nominex
MASK-USDT$2.04
0.0008212 Eth
$22,933.00
11,252.060 MASK
0.0466%
65
Crypto.com Exchange
MASK-USDT$2.04
0.0008201 Eth
$21,268.00
10,450.500 MASK
0.0433%
66
DeGate
0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074-0XA0B86991C6218B36C1D19D4A2E9EB0CE3606EB48$2.03
0.0008214 Eth
$19,694.66
9,481.295 0X69AF81E73A73B40ADF4F3D4223CD9B1ECE623074
0.0393%
67
Koinpark
MASK-USDT$2.04
0.0008209 Eth
$19,665.58
9,652.971 MASK
0.0400%
68
Cryptology
MASK-USDT$2.03
0.0008207 Eth
$16,185.14
7,956.000 MASK
0.0330%
69
Bitlo
MASK-TRY$2.03
0.0008192 Eth
$13,081.28
6,271.200 MASK
0.0260%
70
Bitci TR
MASK-TRY$2.04
0.0008237 Eth
$9,554.78
4,570.630 MASK
0.0189%
71
Paribu
MASK-TRY$2.04
0.0008266 Eth
$7,771.00
3,809.010 MASK
0.0158%
72
Kanga
MASK-USDT$2.03
0.0008197 Eth
$6,585.35
0.000 MASK
0.0000%
73
Vindax
MASK-USDT$2.02
0.0008129 Eth
$5,854.68
2,902.300 MASK
0.0120%
74
Coinbase Exchange
MASK-GBP$2.02
0.0008134 Eth
$5,381.01
2,665.760 MASK
0.0110%
75
WEEX
MASK-USDT$2.04
0.0008209 Eth
$5,192.95
2,505.000 MASK
0.0104%
76
Crypto.com Exchange
MASK-USD$2.04
0.0008215 Eth
$3,942.04
1,933.700 MASK
0.0080%
77
Gemini
MASK-USD$2.02
0.0008144 Eth
$3,099.43
1,533.611 MASK
0.0064%
78
OKX
MASK-USDC$2.04
0.0008218 Eth
$2,349.56
1,153.662 MASK
0.0048%
79
Quickswap
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X2791BCA1F2DE4661ED88A30C99A7A9449AA84174$2.00
0.0008113 Eth
$1,912.23
938.184 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0039%
80
Mudrex
MASK-USDT$2.04
0.0008212 Eth
$1,369.84
672.934 MASK
0.0028%
81
TokoCrypto
MASK-USDT$2.02
0.0008193 Eth
$776.11
383.513 MASK
0.0016%
82
PancakeSwap (v2)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.04
0.0008206 Eth
$687.18
313.485 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0013%
83
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0XBB4CDB9CBD36B01BD1CBAEBF2DE08D9173BC095C$2.02
0.0008146 Eth
$576.79
281.801 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0012%
84
Nominex
MASK-BNB$2.03
0.0008161 Eth
$568.85
280.839 MASK
0.0012%
85
Binance US
MASK-USDT$1.99
0.0008033 Eth
$314.14
157.570 MASK
0.0007%
86
OKCoin Japan
MASK-JPY$2.03
0.0008208 Eth
$230.99
109.123 MASK
0.0005%
87
Kraken
MASK-EUR$2.12
0.0008534 Eth
$163.54
77.243 MASK
0.0003%
88
Bit2Me
MASK-EUR$2.12
0.0008534 Eth
$162.21
75.698 MASK
0.0003%
89
Energiswap
0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E-0XA55F26319462355474A9F2C8790860776A329AA4$2.01
0.0008173 Eth
$62.92
30.201 0X746514E2C7D91E1E84C20C54D1F6F537B28A7D8E
0.0001%
90
Bittime
MASK-IDR$2.04
0.0008246 Eth
$47.19
22.350 MASK
0.0001%
91
CEX.IO
MASK-USDT$2.04
0.0008217 Eth
$34.92
16.871 MASK
0.0001%
92
TokoCrypto
MASK-BNB$2.03
0.0008167 Eth
$33.70
16.632 MASK
0.0001%
93
PancakeSwap V3 (BSC)
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X2170ED0880AC9A755FD29B2688956BD959F933F8$2.01
0.0008131 Eth
$32.16
15.897 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0001%
94
BabySwap
0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3-0X55D398326F99059FF775485246999027B3197955$2.02
0.0008204 Eth
$28.08
13.455 0X2ED9A5C8C13B93955103B9A7C167B67EF4D568A3
0.0001%
95
Mercado Bitcoin
MASK-BRL$2.04
0.0008230 Eth
$26.08
12.766 MASK
0.0001%
96
CEX.IO
MASK-USD$2.04
0.0008234 Eth
$25.36
12.470 MASK
0.0001%
97
Gate.io
MASK-ETH$2.03
0.0008199 Eth
$23.98
11.768 MASK
0.0000%
98
Uniswap V3 (Polygon)
0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7-0X0D500B1D8E8EF31E21C99D1DB9A6444D3ADF1270$2.03
0.0008175 Eth
$18.35
9.255 0X2B9E7CCDF0F4E5B24757C1E1A80E311E34CB10C7
0.0000%
99
Gate.io
MASK-TRY$2.02
0.0008153 Eth
$6.30
3.048 MASK
0.0000%
100
Nominex
MASK-TRY$2.03
0.0008193 Eth
$2.69
1.326 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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