Token Tether USD_Ethereum

Overview BRC20

Price
$1.00 @ 1,458,591.714963 BTT (-0.19%)
Fully Diluted Market Cap
Total Supply:
454,974.407817 USDT_e

Holders:
33 addresses

Transfers:
-

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OVERVIEW

USDT is the official stablecoin issued by Tether, mapped from Ethereum network.

Market

Volume (24H):$27,757,058,525.00
Market Capitalization:$65,621,712,764.00
Circulating Supply:65,707,694,611.00 USDT_e
Market Data Source: Coinmarketcap


Update? Click here to update the token ICO / general information
# Exchange Pair Price  24H Volume % Volume
1
Binance
BTC-USDT$1.00
0.0000581 Btc
$4,007,641,920.00
233,015.521 BTC
0.0000%
2
Binance
ETH-USDT$1.00
0.0000581 Btc
$515,575,350.00
403,882.407 ETH
0.0001%
3
Binance
BUSD-USDT$1.002
0.0000579 Btc
$500,197,297.00
499,262,848.622 BUSD
0.0858%
4
MEXC Global
BTC-USDT$1.002
0.0000579 Btc
$460,185,197.00
26,595.235 BTC
0.0000%
5
Tidex
BTC-USDT$1.002
0.0000579 Btc
$384,596,906.00
22,229.247 BTC
0.0000%
6
MEXC Global
ETH-USDT$1.002
0.0000579 Btc
$307,906,717.00
239,275.168 ETH
0.0000%
7
Gate.io
BTC-USDT$1.002
0.0000579 Btc
$238,384,112.00
14,022.489 BTC
0.0000%
8
BKEX
BTC-USDT$1.002
0.0000579 Btc
$237,440,494.00
13,942.641 BTC
0.0000%
9
Bitget
BTC-USDT$1.002
0.0000579 Btc
$231,524,540.00
13,586.915 BTC
0.0000%
10
XT.COM
BTC-USDT$1.002
0.0000579 Btc
$179,226,890.00
10,541.779 BTC
0.0000%
11
P2B
BTC-USDT$1.003
0.0000580 Btc
$160,653,849.00
9,284.688 BTC
0.0000%
12
OKX
ETH-USDT$1.002
0.0000579 Btc
$153,462,869.00
121,841.757 ETH
0.0000%
13
WhiteBIT
BTC-USDT$1.002
0.0000579 Btc
$130,066,915.00
7,525.481 BTC
0.0000%
14
Kraken
USDT-USD$1.00
0.0000578 Btc
$123,323,603.00
123,311,272.251 USDT
0.0212%
15
BTCEX
BTC-USDT$1.002
0.0000579 Btc
$122,839,984.00
7,221.914 BTC
0.0000%
16
DigiFinex
BTC-USDT$1.002
0.0000579 Btc
$111,291,135.00
6,436.489 BTC
0.0000%
17
WhiteBIT
ETH-USDT$1.002
0.0000579 Btc
$107,395,010.00
83,539.561 ETH
0.0000%
18
Binance
XRP-USDT$1.002
0.0000579 Btc
$104,800,574.00
265,561,792.010 XRP
0.0456%
19
Binance
DOGE-USDT$0.998
0.0000580 Btc
$98,483,778.00
1,002,751,012.774 DOGE
0.1723%
20
Bitforex
USDC-USDT$1.002
0.0000579 Btc
$94,778,055.00
94,622,345.733 USDC
0.0163%
21
BKEX
ETH-USDT$1.002
0.0000579 Btc
$87,748,321.00
69,575.098 ETH
0.0000%
22
OKX
BTC-USDT$1.002
0.0000579 Btc
$87,653,515.00
5,148.818 BTC
0.0000%
23
Binance
BNB-USDT$1.002
0.0000579 Btc
$80,921,205.00
278,229.525 BNB
0.0000%
24
Bitget
ETH-USDT$1.002
0.0000579 Btc
$77,537,388.00
61,637.423 ETH
0.0000%
25
BingX
BTC-USDT$1.002
0.0000579 Btc
$74,876,081.00
4,401.794 BTC
0.0000%
26
Bitforex
BTC-USDT$1.002
0.0000579 Btc
$73,884,717.00
4,272.506 BTC
0.0000%
27
Binance
LTC-USDT$1.002
0.0000579 Btc
$70,800,812.00
902,305.218 LTC
0.0002%
28
P2B
BUSD-USDT$1.003
0.0000580 Btc
$70,610,348.00
70,440,830.200 BUSD
0.0121%
29
Kraken
USDT-EUR$0.9991
0.0000580 Btc
$70,304,096.00
70,364,556.764 USDT
0.0121%
30
Dcoin
BTC-USDT$1.003
0.0000580 Btc
$66,333,615.00
3,835.000 BTC
0.0000%
31
XT.COM
ETH-USDT$1.002
0.0000579 Btc
$64,791,380.00
51,603.339 ETH
0.0000%
32
P2B
ETH-USDT$1.003
0.0000580 Btc
$63,509,025.00
49,426.329 ETH
0.0000%
33
Coinbase Exchange
USDT-USD$1.00
0.0000578 Btc
$62,787,249.00
62,784,737.280 USDT
0.0108%
34
Tidex
ETH-USDT$1.002
0.0000579 Btc
$52,581,774.00
40,834.529 ETH
0.0000%
35
Binance
MATIC-USDT$1.002
0.0000579 Btc
$52,161,279.00
56,121,411.759 MATIC
0.0096%
36
Dcoin
ETH-USDT$1.003
0.0000580 Btc
$49,601,908.00
38,560.000 ETH
0.0000%
37
Huobi
BTC-USDT$1.002
0.0000579 Btc
$49,338,047.00
2,898.925 BTC
0.0000%
38
DigiFinex
ETH-USDT$1.002
0.0000579 Btc
$49,098,308.00
38,203.507 ETH
0.0000%
39
Bitfinex
ETH-USDT$1.002
0.0000579 Btc
$44,861,396.00
34,857.222 ETH
0.0000%
40
BTCEX
ETH-USDT$1.002
0.0000579 Btc
$41,292,428.00
32,812.891 ETH
0.0000%
41
Bitforex
LTC-USDT$1.002
0.0000579 Btc
$40,164,616.00
511,686.163 LTC
0.0001%
42
Binance
USDT-TRY$1.012
0.0000585 Btc
$39,605,198.00
39,126,285.262 USDT
0.0067%
43
BingX
ETH-USDT$1.002
0.0000579 Btc
$38,330,882.00
30,436.285 ETH
0.0000%
44
WhiteBIT
USDT-EUR$0.9985
0.0000577 Btc
$36,211,805.00
36,267,960.943 USDT
0.0062%
45
Bitforex
DOT-USDT$1.002
0.0000579 Btc
$34,972,323.00
6,420,058.183 DOT
0.0011%
46
Dex-Trade
BTC-USDT$1.002
0.0000579 Btc
$34,337,751.00
1,984.591 BTC
0.0000%
47
Bitfinex
USDT-USD$1.001
0.0000579 Btc
$31,231,106.00
31,203,022.938 USDT
0.0054%
48
Bitforex
ETH-USDT$1.002
0.0000579 Btc
$29,836,443.00
23,192.122 ETH
0.0000%
49
Binance
SOL-USDT$0.9982
0.0000580 Btc
$28,558,479.00
2,091,431.932 SOL
0.0004%
50
P2B
BNB-USDT$1.003
0.0000580 Btc
$28,074,027.00
96,332.396 BNB
0.0000%
51
LATOKEN
BTC-USDT$1.002
0.0000579 Btc
$27,285,152.00
1,577.293 BTC
0.0000%
52
Bitforex
AVAX-USDT$1.002
0.0000579 Btc
$27,147,523.00
2,006,271.295 AVAX
0.0003%
53
MEXC Global
XRP-USDT$1.002
0.0000579 Btc
$26,085,461.00
66,056,244.430 XRP
0.0113%
54
Huobi
USDC-USDT$1.002
0.0000579 Btc
$23,788,819.00
23,748,984.639 USDC
0.0041%
55
Huobi
ETH-USDT$1.002
0.0000579 Btc
$23,567,404.00
18,690.023 ETH
0.0000%
56
WOO Network
ETH-USDT$1.002
0.0000579 Btc
$22,781,915.00
17,707.295 ETH
0.0000%
57
WhiteBIT
USDC-USDT$1.002
0.0000579 Btc
$22,616,004.00
22,578,848.701 USDC
0.0039%
58
Kraken
USDC-USDT$0.9972
0.0000579 Btc
$21,259,126.00
21,318,348.705 USDC
0.0037%
59
MEXC Global
BNB-USDT$1.002
0.0000579 Btc
$18,394,421.00
63,170.523 BNB
0.0000%
60
Binance US
BTC-USDT$1.002
0.0000579 Btc
$17,424,269.00
1,007.062 BTC
0.0000%
61
Bitforex
DOGE-USDT$1.002
0.0000579 Btc
$15,537,478.00
156,294,167.352 DOGE
0.0268%
62
BKEX
DOGE-USDT$1.002
0.0000579 Btc
$14,552,798.00
149,895,703.070 DOGE
0.0257%
63
DigiFinex
USDC-USDT$1.002
0.0000579 Btc
$13,018,457.00
12,995,769.800 USDC
0.0022%
64
BKEX
DOT-USDT$1.002
0.0000579 Btc
$12,840,257.00
2,396,860.560 DOT
0.0004%
65
DigiFinex
XRP-USDT$1.002
0.0000579 Btc
$12,639,949.00
32,052,076.249 XRP
0.0055%
66
Bybit
USDC-USDT$1.002
0.0000579 Btc
$9,167,174.00
9,150,963.810 USDC
0.0016%
67
Bitforex
XRP-USDT$1.002
0.0000579 Btc
$7,775,025.00
19,714,769.295 XRP
0.0034%
68
OKX
USDC-USDT$1.002
0.0000579 Btc
$7,102,235.00
7,089,667.252 USDC
0.0012%
69
Crypto.com Exchange
USDT-USD$1.00
0.0000578 Btc
$6,820,113.00
6,819,908.000 USDT
0.0012%
70
DigiFinex
BUSD-USDT$1.003
0.0000580 Btc
$6,223,505.00
6,207,322.408 BUSD
0.0011%
71
Okcoin
USDT-USD$1.001
0.0000578 Btc
$6,222,649.00
6,219,539.544 USDT
0.0011%
72
WhiteBIT
XRP-USDT$1.002
0.0000579 Btc
$5,941,264.00
15,039,944.000 XRP
0.0026%
73
BKEX
TRX-USDT$1.002
0.0000579 Btc
$5,766,179.00
107,121,757.890 TRX
0.0184%
74
BKEX
USDC-USDT$1.002
0.0000579 Btc
$5,563,976.00
5,554,142.568 USDC
0.0010%
75
BKEX
BUSD-USDT$1.002
0.0000579 Btc
$5,300,672.00
5,291,149.943 BUSD
0.0009%
76
BingX
BNB-USDT$1.002
0.0000579 Btc
$4,922,023.00
17,098.453 BNB
0.0000%
77
Bitfinex
BTC-USDT$1.002
0.0000579 Btc
$4,514,037.00
260.892 BTC
0.0000%
78
BKEX
SHIB-USDT$1.002
0.0000579 Btc
$4,139,860.00
448,676,658,911.000 SHIB
77.0731%
79
DigiFinex
MATIC-USDT$1.002
0.0000579 Btc
$4,071,466.00
4,384,000.830 MATIC
0.0008%
80
DigiFinex
LINK-USDT$1.002
0.0000579 Btc
$3,901,603.00
556,480.030 LINK
0.0001%
81
XT.COM
USDC-USDT$1.002
0.0000579 Btc
$3,634,609.00
3,628,015.630 USDC
0.0006%
82
WhiteBIT
USDT-UAH$1.067
0.0000617 Btc
$3,622,243.00
3,393,733.600 USDT
0.0006%
83
Binance US
USDT-USD$1.00
0.0000578 Btc
$3,417,830.00
3,417,829.841 USDT
0.0006%
84
DigiFinex
BNB-USDT$1.003
0.0000580 Btc
$3,384,613.00
11,631.964 BNB
0.0000%
85
WhiteBIT
USDT-USD$0.9999
0.0000578 Btc
$2,773,627.00
2,773,904.367 USDT
0.0005%
86
MEXC Global
SOL-USDT$1.002
0.0000579 Btc
$2,584,048.00
187,858.420 SOL
0.0000%
87
BingX
DOGE-USDT$1.002
0.0000579 Btc
$1,761,727.00
18,146,465.199 DOGE
0.0031%
88
XT.COM
XTUSD-USDT$1.002
0.0000579 Btc
$1,493,463.00
1,490,598.420 XTUSD
0.0003%
89
MEXC Global
ADA-USDT$1.002
0.0000579 Btc
$1,413,763.00
4,470,386.930 ADA
0.0008%
90
WhiteBIT
ADA-USDT$1.002
0.0000579 Btc
$1,410,420.00
4,464,439.250 ADA
0.0008%
91
BingX
SHIB-USDT$1.002
0.0000579 Btc
$1,202,486.00
130,377,627,626.000 SHIB
22.3961%
92
BTCEX
APE-USDT$1.002
0.0000579 Btc
$1,135,644.00
292,767.114 APE
0.0001%
93
Coinzoom
BTC-USDT$1.002
0.0000579 Btc
$1,065,874.00
61.629 BTC
0.0000%
94
Coinzoom
ETH-USDT$1.002
0.0000579 Btc
$934,916.00
727.017 ETH
0.0000%
95
BTCEX
BNB-USDT$1.002
0.0000579 Btc
$857,851.00
2,981.664 BNB
0.0000%
96
DigiFinex
AAVE-USDT$1.002
0.0000579 Btc
$798,750.00
12,622.749 AAVE
0.0000%
97
WhiteBIT
LINK-USDT$1.002
0.0000579 Btc
$759,148.00
107,946.110 LINK
0.0000%
98
Bitget
USDC-USDT$1.002
0.0000579 Btc
$734,006.00
732,608.877 USDC
0.0001%
99
Bitget
BUSD-USDT$1.002
0.0000579 Btc
$358,036.00
357,458.000 BUSD
0.0001%
100
Phemex
USDC-USDT$1.002
0.0000579 Btc
$237,002.00
236,583.190 USDC
0.0000%

Contract Source Code Verified (Exact Match)

Contract Name:
USDT_e

Compiler Version
v0.6.6+commit.6c089d02

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2022-02-17
*/

// 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/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/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: @openzeppelin/contracts/utils/EnumerableSet.sol
 
// SPDX-License-Identifier: MIT
 
pragma solidity >=0.6.0 <0.8.0;
 
/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.
 
    struct Set {
        // Storage of set values
        bytes32[] _values;
 
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping (bytes32 => uint256) _indexes;
    }
 
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }
 
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];
 
        if (valueIndex != 0) { // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.
 
            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;
 
            // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs
            // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement.
 
            bytes32 lastvalue = set._values[lastIndex];
 
            // Move the last value to the index where the value to delete is
            set._values[toDeleteIndex] = lastvalue;
            // Update the index for the moved value
            set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based
 
            // Delete the slot where the moved value was stored
            set._values.pop();
 
            // Delete the index for the deleted slot
            delete set._indexes[value];
 
            return true;
        } else {
            return false;
        }
    }
 
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }
 
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }
 
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        require(set._values.length > index, "EnumerableSet: index out of bounds");
        return set._values[index];
    }
 
    // Bytes32Set
 
    struct Bytes32Set {
        Set _inner;
    }
 
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }
 
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }
 
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }
 
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
 
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }
 
    // AddressSet
 
    struct AddressSet {
        Set _inner;
    }
 
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }
 
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }
 
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }
 
    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
 
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }
 
 
    // UintSet
 
    struct UintSet {
        Set _inner;
    }
 
    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }
 
    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }
 
    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }
 
    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }
 
   /**
    * @dev Returns the value stored at position `index` in the set. O(1).
    *
    * Note that there are no guarantees on the ordering of values inside the
    * array, and it may change when more values are added or removed.
    *
    * Requirements:
    *
    * - `index` must be strictly less than {length}.
    */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }
}
 
// File: @openzeppelin/contracts/utils/Address.sol
 
// SPDX-License-Identifier: MIT
 
pragma solidity >=0.6.2 <0.8.0;
 
/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.
 
        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }
 
    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");
 
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }
 
    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }
 
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }
 
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }
 
    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");
 
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
 
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }
 
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");
 
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
 
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }
 
    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");
 
        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }
 
    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly
 
                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}
 
// File: @openzeppelin/contracts/access/AccessControl.sol
 
// SPDX-License-Identifier: MIT
 
pragma solidity >=0.6.0 <0.8.0;
 
 
 
 
/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it.
 */
abstract contract AccessControl is Context {
    using EnumerableSet for EnumerableSet.AddressSet;
    using Address for address;
 
    struct RoleData {
        EnumerableSet.AddressSet members;
        bytes32 adminRole;
    }
 
    mapping (bytes32 => RoleData) private _roles;
 
    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;
 
    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted signaling this.
     *
     * _Available since v3.1._
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);
 
    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call, an admin role
     * bearer except when using {_setupRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);
 
    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);
 
    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view returns (bool) {
        return _roles[role].members.contains(account);
    }
 
    /**
     * @dev Returns the number of accounts that have `role`. Can be used
     * together with {getRoleMember} to enumerate all bearers of a role.
     */
    function getRoleMemberCount(bytes32 role) public view returns (uint256) {
        return _roles[role].members.length();
    }
 
    /**
     * @dev Returns one of the accounts that have `role`. `index` must be a
     * value between 0 and {getRoleMemberCount}, non-inclusive.
     *
     * Role bearers are not sorted in any particular way, and their ordering may
     * change at any point.
     *
     * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure
     * you perform all queries on the same block. See the following
     * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post]
     * for more information.
     */
    function getRoleMember(bytes32 role, uint256 index) public view returns (address) {
        return _roles[role].members.at(index);
    }
 
    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view returns (bytes32) {
        return _roles[role].adminRole;
    }
 
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant");
 
        _grantRole(role, account);
    }
 
    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) public virtual {
        require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke");
 
        _revokeRole(role, account);
    }
 
    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `account`.
     */
    function renounceRole(bytes32 role, address account) public virtual {
        require(account == _msgSender(), "AccessControl: can only renounce roles for self");
 
        _revokeRole(role, account);
    }
 
    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event. Note that unlike {grantRole}, this function doesn't perform any
     * checks on the calling account.
     *
     * [WARNING]
     * ====
     * This function should only be called from the constructor when setting
     * up the initial roles for the system.
     *
     * Using this function in any other way is effectively circumventing the admin
     * system imposed by {AccessControl}.
     * ====
     */
    function _setupRole(bytes32 role, address account) internal virtual {
        _grantRole(role, account);
    }
 
    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        emit RoleAdminChanged(role, _roles[role].adminRole, adminRole);
        _roles[role].adminRole = adminRole;
    }
 
    function _grantRole(bytes32 role, address account) private {
        if (_roles[role].members.add(account)) {
            emit RoleGranted(role, account, _msgSender());
        }
    }
 
    function _revokeRole(bytes32 role, address account) private {
        if (_roles[role].members.remove(account)) {
            emit RoleRevoked(role, account, _msgSender());
        }
    }
}
 
// File: contracts/common/AccessControlMixin.sol
 
pragma solidity 0.6.6;
 
 
contract AccessControlMixin is AccessControl {
    string private _revertMsg;
    function _setupContractId(string memory contractId) internal {
        _revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS"));
    }
 
    modifier only(bytes32 role) {
        require(
            hasRole(role, _msgSender()),
            _revertMsg
        );
        _;
    }
}
 
// File: contracts/child/ChildToken/IChildToken.sol
 
pragma solidity 0.6.6;
 
interface IChildToken {
    event WithdrawTo(address indexed from, address indexed to, uint256 amount);
    function deposit(address user, bytes calldata depositData) external;
}
 
// File: contracts/common/Initializable.sol
 
pragma solidity 0.6.6;
 
contract Initializable {
    bool inited = false;
 
    modifier initializer() {
        require(!inited, "already inited");
        _;
        inited = true;
    }
}
 
// File: contracts/common/EIP712Base.sol
 
pragma solidity 0.6.6;
 
 
contract EIP712Base is Initializable {
    struct EIP712Domain {
        string name;
        string version;
        address verifyingContract;
        bytes32 salt;
    }
 
    string constant public ERC712_VERSION = "1";
 
    bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256(
        bytes(
            "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)"
        )
    );
    bytes32 internal domainSeperator;
 
    // supposed to be called once while initializing.
    // one of the contractsa that inherits this contract follows proxy pattern
    // so it is not possible to do this in a constructor
    function _initializeEIP712(
        string memory name
    )
        internal
        initializer
    {
        _setDomainSeperator(name);
    }
 
    function _setDomainSeperator(string memory name) internal {
        domainSeperator = keccak256(
            abi.encode(
                EIP712_DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                keccak256(bytes(ERC712_VERSION)),
                address(this),
                bytes32(getChainId())
            )
        );
    }
 
    function getDomainSeperator() public view returns (bytes32) {
        return domainSeperator;
    }
 
    function getChainId() public pure returns (uint256) {
        uint256 id;
        assembly {
            id := chainid()
        }
        return id;
    }
 
    /**
     * Accept message hash and returns hash message in EIP712 compatible form
     * So that it can be used to recover signer from signature signed using EIP712 formatted data
     * https://eips.ethereum.org/EIPS/eip-712
     * "\\x19" makes the encoding deterministic
     * "\\x01" is the version byte to make it compatible to EIP-191
     */
    function toTypedMessageHash(bytes32 messageHash)
        internal
        view
        returns (bytes32)
    {
        return
            keccak256(
                abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash)
            );
    }
}
 
// File: contracts/common/NativeMetaTransaction.sol
 
pragma solidity 0.6.6;
 
 
 
contract NativeMetaTransaction is EIP712Base {
    using SafeMath for uint256;
    bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256(
        bytes(
            "MetaTransaction(uint256 nonce,address from,bytes functionSignature)"
        )
    );
    event MetaTransactionExecuted(
        address userAddress,
        address payable relayerAddress,
        bytes functionSignature
    );
    mapping(address => uint256) nonces;
 
    /*
     * Meta transaction structure.
     * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas
     * He should call the desired function directly in that case.
     */
    struct MetaTransaction {
        uint256 nonce;
        address from;
        bytes functionSignature;
    }
 
    function executeMetaTransaction(
        address userAddress,
        bytes memory functionSignature,
        bytes32 sigR,
        bytes32 sigS,
        uint8 sigV
    ) public payable returns (bytes memory) {
        MetaTransaction memory metaTx = MetaTransaction({
            nonce: nonces[userAddress],
            from: userAddress,
            functionSignature: functionSignature
        });
 
        require(
            verify(userAddress, metaTx, sigR, sigS, sigV),
            "Signer and signature do not match"
        );
 
        // increase nonce for user (to avoid re-use)
        nonces[userAddress] = nonces[userAddress].add(1);
 
        emit MetaTransactionExecuted(
            userAddress,
            msg.sender,
            functionSignature
        );
 
        // Append userAddress and relayer address at the end to extract it from calling context
        (bool success, bytes memory returnData) = address(this).call(
            abi.encodePacked(functionSignature, userAddress)
        );
        require(success, "Function call not successful");
 
        return returnData;
    }
 
    function hashMetaTransaction(MetaTransaction memory metaTx)
        internal
        pure
        returns (bytes32)
    {
        return
            keccak256(
                abi.encode(
                    META_TRANSACTION_TYPEHASH,
                    metaTx.nonce,
                    metaTx.from,
                    keccak256(metaTx.functionSignature)
                )
            );
    }
 
    function getNonce(address user) public view returns (uint256 nonce) {
        nonce = nonces[user];
    }
 
    function verify(
        address signer,
        MetaTransaction memory metaTx,
        bytes32 sigR,
        bytes32 sigS,
        uint8 sigV
    ) internal view returns (bool) {
        require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER");
        return
            signer ==
            ecrecover(
                toTypedMessageHash(hashMetaTransaction(metaTx)),
                sigV,
                sigR,
                sigS
            );
    }
}
 
// File: contracts/common/ContextMixin.sol
 
pragma solidity 0.6.6;
 
abstract contract ContextMixin {
    function msgSender()
        internal
        view
        returns (address payable sender)
    {
        if (msg.sender == address(this)) {
            bytes memory array = msg.data;
            uint256 index = msg.data.length;
            assembly {
                // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those.
                sender := and(
                    mload(add(array, index)),
                    0xffffffffffffffffffffffffffffffffffffffff
                )
            }
        } else {
            sender = msg.sender;
        }
        return sender;
    }
}
 
// File: contracts/child/ChildToken/ChildERC20.sol
 
pragma solidity 0.6.6;
 
 
 
 
 
 
 
contract USDT_e is
    ERC20,
    IChildToken,
    AccessControlMixin,
    NativeMetaTransaction,
    ContextMixin
{
    bytes32 public constant DEPOSITOR_ROLE = keccak256("DEPOSITOR_ROLE");
 
    constructor(
        string memory name_,
        string memory symbol_,
        uint8 decimals_,
        address childChainManager
    ) public ERC20(name_, symbol_) {
        _setupContractId("USDT_e");
        _setupDecimals(decimals_);
        _setupRole(DEPOSITOR_ROLE, childChainManager);
        _initializeEIP712(name_);
    }
 
    // This is to support Native meta transactions
    // never use msg.sender directly, use _msgSender() instead
    function _msgSender()
        internal
        override
        view
        returns (address payable sender)
    {
        return ContextMixin.msgSender();
    }
 
    /**
     * @notice called when token is deposited on root chain
     * @dev Should be callable only by ChildChainManager
     * Should handle deposit by minting the required amount for user
     * Make sure minting is done only by this function
     * @param user user address for whom deposit is being done
     * @param depositData abi encoded amount
     */
    function deposit(address user, bytes calldata depositData)
        external
        override
        only(DEPOSITOR_ROLE)
    {
        uint256 amount = abi.decode(depositData, (uint256));
        _mint(user, amount);
    }
 
    /**
     * @notice called when user wants to withdraw tokens back to root chain
     * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain
     * @param amount amount of tokens to withdraw
     */
    function withdrawTo(address to, uint256 amount) public {
        _burn(_msgSender(), amount);
        emit WithdrawTo(to, address(0x00), amount);
    }
 
    function withdraw(uint256 amount) external {
        withdrawTo(_msgSender(), amount);
    }
}

Contract Security Audit

Contract ABI

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

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

-----Decoded View---------------
Arg [0] : name_ (string): Tether USD_Ethereum
Arg [1] : symbol_ (string): USDT_e
Arg [2] : decimals_ (uint8): 6
Arg [3] : childChainManager (address): 0x9a15f3a682d086c515be4037bda3b0676203a8ef

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [3] : 0000000000000000000000009a15f3a682d086c515be4037bda3b0676203a8ef
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000013
Arg [5] : 546574686572205553445f457468657265756d00000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [7] : 555344545f650000000000000000000000000000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://d8f6876661355e6cc5479d67fefd4dc3a93e363c234f97d16d89962ee4bfa658
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