Overview
Max Total Supply
54,940,840,345.993792 USDT
Holders
6,284,581 ( -0.025%)
Market
Price
$1.00 @ 0.000410 ETH (+0.24%)
Onchain Market Cap
$54,995,781,186.34
Circulating Supply Market Cap
$120,641,964,060.00
Other Info
Token Contract (WITH 6 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
---|---|---|---|---|---|
1 | Binance | BTC-USDT | $0.9995 0.0004100 Eth | $2,093,662,813.00 30,753.391 BTC | 0.0000% |
2 | Hotcoin | BTC-USDT | $0.9995 0.0004095 Eth | $1,714,655,297.00 24,899.655 BTC | 0.0000% |
3 | Bybit | BTC-USDT | $0.9993 0.0004100 Eth | $1,495,192,274.00 21,943.683 BTC | 0.0000% |
4 | BVOX | BTC-USDT | $0.9994 0.0004091 Eth | $1,344,257,202.00 19,713.019 BTC | 0.0000% |
5 | Toobit | BTC-USDT | $0.9993 0.0004098 Eth | $1,168,973,667.00 17,168.990 BTC | 0.0000% |
6 | Pionex | BTC-USDT | $0.9998 0.0004097 Eth | $1,065,116,914.00 15,629.979 BTC | 0.0000% |
7 | BitMart | BTC-USDT | $0.9994 0.0004096 Eth | $998,898,581.00 14,490.565 BTC | 0.0000% |
8 | OrangeX | BTC-USDT | $0.9996 0.0004098 Eth | $897,626,401.00 13,178.352 BTC | 0.0000% |
9 | Binance | ETH-USDT | $0.9994 0.0004096 Eth | $808,316,320.00 334,014.875 ETH | 0.0000% |
10 | P2B | BTC-USDT | $0.9993 0.0004100 Eth | $759,161,619.00 11,027.938 BTC | 0.0000% |
11 | DigiFinex | BTC-USDT | $0.9989 0.0004098 Eth | $722,814,860.00 10,502.496 BTC | 0.0000% |
12 | WhiteBIT | BTC-USDT | $0.9993 0.0004094 Eth | $656,781,165.00 9,539.095 BTC | 0.0000% |
13 | Deepcoin | BTC-USDT | $1.00 0.0004101 Eth | $623,709,466.00 9,109.677 BTC | 0.0000% |
14 | WEEX | ETH-USDT | $0.9994 0.0004098 Eth | $611,196,370.00 252,200.308 ETH | 0.0000% |
15 | BitMart | ETH-USDT | $0.9994 0.0004096 Eth | $606,031,551.00 248,265.979 ETH | 0.0000% |
16 | Tapbit | ETH-USDT | $0.9989 0.0004098 Eth | $581,689,841.00 240,344.695 ETH | 0.0000% |
17 | OKX | BTC-USDT | $0.9995 0.0004100 Eth | $561,106,652.00 8,246.779 BTC | 0.0000% |
18 | Toobit | ETH-USDT | $0.9994 0.0004096 Eth | $541,902,621.00 223,892.844 ETH | 0.0000% |
19 | Hotcoin | ETH-USDT | $0.9989 0.0004098 Eth | $527,739,890.00 216,563.225 ETH | 0.0000% |
20 | Binance | SOL-USDT | $0.9995 0.0004100 Eth | $525,203,666.00 3,275,083.498 SOL | 0.0000% |
21 | Bitunix | BTC-USDT | $0.9993 0.0004098 Eth | $523,903,834.00 7,611.844 BTC | 0.0000% |
22 | Binance | DOGE-USDT | $0.9989 0.0004098 Eth | $519,051,924.00 3,257,025,774.000 DOGE | 0.0322% |
23 | Bybit | ETH-USDT | $0.9993 0.0004100 Eth | $506,545,159.00 208,979.401 ETH | 0.0000% |
24 | AscendEX (BitMax) | BTC-USDT | $0.9993 0.0004098 Eth | $473,869,925.00 6,883.841 BTC | 0.0000% |
25 | XT.COM | BTC-USDT | $0.9996 0.0004095 Eth | $426,556,805.00 6,264.235 BTC | 0.0000% |
26 | BVOX | ETH-USDT | $0.9989 0.0004098 Eth | $416,006,407.00 171,273.927 ETH | 0.0000% |
27 | FameEX | ETH-USDT | $0.9993 0.0004090 Eth | $336,761,562.00 139,143.943 ETH | 0.0000% |
28 | MEXC | ETH-USDT | $0.9989 0.0004098 Eth | $328,172,003.00 134,676.320 ETH | 0.0000% |
29 | WhiteBIT | ETH-USDT | $0.9997 0.0004091 Eth | $309,704,400.00 126,795.023 ETH | 0.0000% |
30 | HTX | BTC-USDT | $0.9993 0.0004098 Eth | $304,781,196.00 4,473.451 BTC | 0.0000% |
31 | P2B | ETH-USDT | $0.9996 0.0004098 Eth | $302,878,305.00 124,143.330 ETH | 0.0000% |
32 | DigiFinex | ETH-USDT | $0.9989 0.0004098 Eth | $285,698,964.00 117,250.899 ETH | 0.0000% |
33 | OrangeX | ETH-USDT | $0.9997 0.0004091 Eth | $275,136,150.00 113,436.642 ETH | 0.0000% |
34 | OKX | ETH-USDT | $0.9993 0.0004098 Eth | $267,071,131.00 110,575.894 ETH | 0.0000% |
35 | AscendEX (BitMax) | ETH-USDT | $0.9993 0.0004098 Eth | $258,282,333.00 105,990.215 ETH | 0.0000% |
36 | BigONE | BTC-USDT | $0.9997 0.0004092 Eth | $250,442,216.00 3,633.298 BTC | 0.0000% |
37 | Tapbit | BTC-USDT | $0.9995 0.0004091 Eth | $249,213,889.00 3,661.651 BTC | 0.0000% |
38 | CoinW | ETH-USDT | $0.9991 0.0004094 Eth | $247,964,219.00 101,654.661 ETH | 0.0000% |
39 | XT.COM | ETH-USDT | $0.9993 0.0004098 Eth | $224,127,776.00 92,612.961 ETH | 0.0000% |
40 | Gate.io | BTC-USDT | $0.9994 0.0004098 Eth | $221,453,349.00 3,257.773 BTC | 0.0000% |
41 | Bitget | BTC-USDT | $0.9993 0.0004098 Eth | $218,884,081.00 3,210.021 BTC | 0.0000% |
42 | LATOKEN | BTC-USDT | $0.9993 0.0004098 Eth | $218,297,356.00 3,171.283 BTC | 0.0000% |
43 | Biconomy.com | BTC-USDT | $0.9997 0.0004092 Eth | $217,581,153.00 3,192.417 BTC | 0.0000% |
44 | Fastex | BTC-USDT | $0.9993 0.0004098 Eth | $187,328,986.00 2,721.114 BTC | 0.0000% |
45 | Gate.io | ETH-USDT | $0.9994 0.0004098 Eth | $186,784,725.00 77,405.169 ETH | 0.0000% |
46 | OKX | DOGE-USDT | $0.9993 0.0004098 Eth | $185,406,167.00 1,162,865,753.071 DOGE | 0.0115% |
47 | Bitunix | ETH-USDT | $0.9993 0.0004098 Eth | $183,365,964.00 75,245.581 ETH | 0.0000% |
48 | Binance | TROY-USDT | $0.9989 0.0004098 Eth | $182,519,653.00 46,641,237,495.000 TROY | 0.4605% |
49 | BTSE | BTC-USDT | $0.9996 0.0004091 Eth | $180,003,997.00 2,610.372 BTC | 0.0000% |
50 | LBank | ETH-USDT | $0.9993 0.0004098 Eth | $168,204,774.00 69,020.112 ETH | 0.0000% |
51 | Binance | SUI-USDT | $0.9991 0.0004096 Eth | $150,038,545.00 80,078,763.400 SUI | 0.0008% |
52 | Coinstore | BTC-USDT | $0.9993 0.0004098 Eth | $147,972,192.00 2,172.351 BTC | 0.0000% |
53 | KuCoin | BTC-USDT | $0.9993 0.0004098 Eth | $145,191,731.00 2,109.718 BTC | 0.0000% |
54 | Bitget | DOGE-USDT | $0.9993 0.0004098 Eth | $142,890,053.00 901,401,696.470 DOGE | 0.0089% |
55 | Binance | BNB-USDT | $0.9994 0.0004094 Eth | $141,650,656.00 255,129.620 BNB | 0.0000% |
56 | Hotcoin | DOGE-USDT | $0.9994 0.0004095 Eth | $135,058,455.00 800,052,817.000 DOGE | 0.0079% |
57 | FameEX | SOL-USDT | $0.9993 0.0004098 Eth | $133,417,416.00 832,176.119 SOL | 0.0000% |
58 | Bitget | ETH-USDT | $0.9993 0.0004098 Eth | $129,885,692.00 53,513.145 ETH | 0.0000% |
59 | Binance | NEIRO-USDT | $0.9993 0.0004094 Eth | $129,587,943.00 100,023,289,333.000 NEIRO | 0.9876% |
60 | Gate.io | DOGE-USDT | $0.9994 0.0004098 Eth | $129,479,285.00 810,464,590.710 DOGE | 0.0080% |
61 | Bybit | SOL-USDT | $0.9993 0.0004100 Eth | $125,135,698.00 780,503.377 SOL | 0.0000% |
62 | Dex-Trade | BTC-USDT | $0.9993 0.0004100 Eth | $122,138,997.00 1,773.528 BTC | 0.0000% |
63 | KuCoin | ETH-USDT | $0.9993 0.0004098 Eth | $120,067,774.00 49,273.731 ETH | 0.0000% |
64 | Biconomy.com | ETH-USDT | $0.9994 0.0004096 Eth | $119,020,357.00 49,076.021 ETH | 0.0000% |
65 | WhiteBIT | DOGE-USDT | $0.9993 0.0004096 Eth | $112,653,940.00 668,742,127.000 DOGE | 0.0066% |
66 | LATOKEN | ETH-USDT | $0.9993 0.0004094 Eth | $109,904,361.00 45,009.847 ETH | 0.0000% |
67 | Coinstore | ETH-USDT | $0.9993 0.0004091 Eth | $108,303,442.00 44,650.100 ETH | 0.0000% |
68 | WhiteBIT | SOL-USDT | $0.9994 0.0004095 Eth | $107,462,848.00 662,889.759 SOL | 0.0000% |
69 | Binance | RUNE-USDT | $0.9995 0.0004100 Eth | $105,394,967.00 23,161,387.200 RUNE | 0.0002% |
70 | Bybit | DOGE-USDT | $0.9993 0.0004100 Eth | $102,649,103.00 646,088,645.000 DOGE | 0.0064% |
71 | Binance | XRP-USDT | $0.9997 0.0004091 Eth | $102,038,316.00 201,056,954.000 XRP | 0.0020% |
72 | LBank | SOL-USDT | $0.9993 0.0004094 Eth | $97,727,032.00 603,556.510 SOL | 0.0000% |
73 | OKX | SOL-USDT | $0.9993 0.0004098 Eth | $97,410,861.00 607,136.319 SOL | 0.0000% |
74 | Deepcoin | SOL-USDT | $0.9991 0.0004094 Eth | $93,613,936.00 583,786.468 SOL | 0.0000% |
75 | FameEX | DOGE-USDT | $0.9994 0.0004096 Eth | $78,757,893.00 494,100,915.775 DOGE | 0.0049% |
76 | Bitunix | DOGE-USDT | $0.9993 0.0004098 Eth | $73,967,759.00 439,663,724.000 DOGE | 0.0043% |
77 | Bitget | SOL-USDT | $0.9993 0.0004098 Eth | $72,267,214.00 451,065.565 SOL | 0.0000% |
78 | BTSE | ETH-USDT | $0.9993 0.0004100 Eth | $71,692,630.00 29,407.225 ETH | 0.0000% |
79 | Bybit | XRP-USDT | $0.9993 0.0004100 Eth | $71,222,870.00 140,528,411.930 XRP | 0.0014% |
80 | HTX | ETH-USDT | $0.9993 0.0004098 Eth | $65,751,439.00 27,113.509 ETH | 0.0000% |
81 | Bybit | MNT-USDT | $0.9993 0.0004100 Eth | $64,104,741.00 115,366,928.490 MNT | 0.0011% |
82 | DigiFinex | DOGE-USDT | $0.9989 0.0004098 Eth | $63,170,221.00 375,593,992.850 DOGE | 0.0037% |
83 | Slex | BTC-USDT | $0.9995 0.0004095 Eth | $56,757,880.00 833.618 BTC | 0.0000% |
84 | Bitget | BGB-USDT | $0.9993 0.0004098 Eth | $56,590,891.00 50,767,316.680 BGB | 0.0005% |
85 | Bitunix | SOL-USDT | $0.9993 0.0004098 Eth | $55,771,410.00 344,009.770 SOL | 0.0000% |
86 | Coinbase Exchange | BTC-USDT | $0.9995 0.0004100 Eth | $53,231,577.00 773.078 BTC | 0.0000% |
87 | MEXC | MX-USDT | $0.9997 0.0004102 Eth | $50,036,756.00 18,680,651.370 MX | 0.0002% |
88 | BYDFi | BTC-USDT | $0.9994 0.0004095 Eth | $48,230,595.00 700.597 BTC | 0.0000% |
89 | CoinEx | BTC-USDT | $0.9993 0.0004096 Eth | $43,913,771.00 645.131 BTC | 0.0000% |
90 | BVOX | SOL-USDT | $0.9992 0.0004097 Eth | $42,454,342.00 264,405.450 SOL | 0.0000% |
91 | Gate.io | SUI-USDT | $0.9989 0.0004098 Eth | $42,409,721.00 22,702,587.470 SUI | 0.0002% |
92 | BVOX | DOGE-USDT | $0.9994 0.0004096 Eth | $42,273,463.00 265,264,349.000 DOGE | 0.0026% |
93 | DigiFinex | SOL-USDT | $0.9989 0.0004098 Eth | $40,882,292.00 252,259.760 SOL | 0.0000% |
94 | Gate.io | PEPE-USDT | $0.9989 0.0004098 Eth | $40,603,984.00 5,038,471,957,544.000 PEPE | 49.7496% |
95 | BingX | BTC-USDT | $0.9993 0.0004098 Eth | $40,233,545.00 590.142 BTC | 0.0000% |
96 | Bitget | PEPE-USDT | $0.9993 0.0004098 Eth | $39,939,251.00 4,931,810,496,320.000 PEPE | 48.6965% |
97 | OKX | SUI-USDT | $0.9993 0.0004098 Eth | $37,894,422.00 20,198,612.491 SUI | 0.0002% |
98 | WhiteBIT | LINK-USDT | $0.9993 0.0004096 Eth | $32,459,441.00 3,087,810.200 LINK | 0.0000% |
99 | XT.COM | DOGE-USDT | $0.9993 0.0004098 Eth | $31,603,525.00 198,246,404.000 DOGE | 0.0020% |
100 | BingX | ETH-USDT | $0.9993 0.0004098 Eth | $25,119,510.00 10,357.327 ETH | 0.0000% |
Contract Name:
TetherToken
Compiler Version
v0.4.18+commit.9cf6e910
Optimization Enabled:
No with 0 runs
Other Settings:
default evmVersion, Audited
Contract Source Code (Solidity)Audit Report
/** *Submitted for verification at Etherscan.io on 2017-11-28 */ pragma solidity ^0.4.17; /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ library SafeMath { function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; assert(c / a == b); return c; } function div(uint256 a, uint256 b) internal pure returns (uint256) { // assert(b > 0); // Solidity automatically throws when dividing by 0 uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } } /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". */ contract Ownable { address public owner; /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() public { owner = msg.sender; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == owner); _; } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) public onlyOwner { if (newOwner != address(0)) { owner = newOwner; } } } /** * @title ERC20Basic * @dev Simpler version of ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20Basic { uint public _totalSupply; function totalSupply() public constant returns (uint); function balanceOf(address who) public constant returns (uint); function transfer(address to, uint value) public; event Transfer(address indexed from, address indexed to, uint value); } /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public constant returns (uint); function transferFrom(address from, address to, uint value) public; function approve(address spender, uint value) public; event Approval(address indexed owner, address indexed spender, uint value); } /** * @title Basic token * @dev Basic version of StandardToken, with no allowances. */ contract BasicToken is Ownable, ERC20Basic { using SafeMath for uint; mapping(address => uint) public balances; // additional variables for use if transaction fees ever became necessary uint public basisPointsRate = 0; uint public maximumFee = 0; /** * @dev Fix for the ERC20 short address attack. */ modifier onlyPayloadSize(uint size) { require(!(msg.data.length < size + 4)); _; } /** * @dev transfer token for a specified address * @param _to The address to transfer to. * @param _value The amount to be transferred. */ function transfer(address _to, uint _value) public onlyPayloadSize(2 * 32) { uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } uint sendAmount = _value.sub(fee); balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(msg.sender, owner, fee); } Transfer(msg.sender, _to, sendAmount); } /** * @dev Gets the balance of the specified address. * @param _owner The address to query the the balance of. * @return An uint representing the amount owned by the passed address. */ function balanceOf(address _owner) public constant returns (uint balance) { return balances[_owner]; } } /** * @title Standard ERC20 token * * @dev Implementation of the basic standard token. * @dev https://github.com/ethereum/EIPs/issues/20 * @dev Based oncode by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol */ contract StandardToken is BasicToken, ERC20 { mapping (address => mapping (address => uint)) public allowed; uint public constant MAX_UINT = 2**256 - 1; /** * @dev Transfer tokens from one address to another * @param _from address The address which you want to send tokens from * @param _to address The address which you want to transfer to * @param _value uint the amount of tokens to be transferred */ function transferFrom(address _from, address _to, uint _value) public onlyPayloadSize(3 * 32) { var _allowance = allowed[_from][msg.sender]; // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met // if (_value > _allowance) throw; uint fee = (_value.mul(basisPointsRate)).div(10000); if (fee > maximumFee) { fee = maximumFee; } if (_allowance < MAX_UINT) { allowed[_from][msg.sender] = _allowance.sub(_value); } uint sendAmount = _value.sub(fee); balances[_from] = balances[_from].sub(_value); balances[_to] = balances[_to].add(sendAmount); if (fee > 0) { balances[owner] = balances[owner].add(fee); Transfer(_from, owner, fee); } Transfer(_from, _to, sendAmount); } /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * @param _spender The address which will spend the funds. * @param _value The amount of tokens to be spent. */ function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) { // To change the approve amount you first have to reduce the addresses` // allowance to zero by calling `approve(_spender, 0)` if it is not // already 0 to mitigate the race condition described here: // https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 require(!((_value != 0) && (allowed[msg.sender][_spender] != 0))); allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); } /** * @dev Function to check the amount of tokens than an owner allowed to a spender. * @param _owner address The address which owns the funds. * @param _spender address The address which will spend the funds. * @return A uint specifying the amount of tokens still available for the spender. */ function allowance(address _owner, address _spender) public constant returns (uint remaining) { return allowed[_owner][_spender]; } } /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is Ownable { event Pause(); event Unpause(); bool public paused = false; /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!paused); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() onlyOwner whenNotPaused public { paused = true; Pause(); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() onlyOwner whenPaused public { paused = false; Unpause(); } } contract BlackList is Ownable, BasicToken { /////// Getters to allow the same blacklist to be used also by other contracts (including upgraded Tether) /////// function getBlackListStatus(address _maker) external constant returns (bool) { return isBlackListed[_maker]; } function getOwner() external constant returns (address) { return owner; } mapping (address => bool) public isBlackListed; function addBlackList (address _evilUser) public onlyOwner { isBlackListed[_evilUser] = true; AddedBlackList(_evilUser); } function removeBlackList (address _clearedUser) public onlyOwner { isBlackListed[_clearedUser] = false; RemovedBlackList(_clearedUser); } function destroyBlackFunds (address _blackListedUser) public onlyOwner { require(isBlackListed[_blackListedUser]); uint dirtyFunds = balanceOf(_blackListedUser); balances[_blackListedUser] = 0; _totalSupply -= dirtyFunds; DestroyedBlackFunds(_blackListedUser, dirtyFunds); } event DestroyedBlackFunds(address _blackListedUser, uint _balance); event AddedBlackList(address _user); event RemovedBlackList(address _user); } contract UpgradedStandardToken is StandardToken{ // those methods are called by the legacy contract // and they must ensure msg.sender to be the contract address function transferByLegacy(address from, address to, uint value) public; function transferFromByLegacy(address sender, address from, address spender, uint value) public; function approveByLegacy(address from, address spender, uint value) public; } contract TetherToken is Pausable, StandardToken, BlackList { string public name; string public symbol; uint public decimals; address public upgradedAddress; bool public deprecated; // The contract can be initialized with a number of tokens // All the tokens are deposited to the owner address // // @param _balance Initial supply of the contract // @param _name Token Name // @param _symbol Token symbol // @param _decimals Token decimals function TetherToken(uint _initialSupply, string _name, string _symbol, uint _decimals) public { _totalSupply = _initialSupply; name = _name; symbol = _symbol; decimals = _decimals; balances[owner] = _initialSupply; deprecated = false; } // Forward ERC20 methods to upgraded contract if this one is deprecated function transfer(address _to, uint _value) public whenNotPaused { require(!isBlackListed[msg.sender]); if (deprecated) { return UpgradedStandardToken(upgradedAddress).transferByLegacy(msg.sender, _to, _value); } else { return super.transfer(_to, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function transferFrom(address _from, address _to, uint _value) public whenNotPaused { require(!isBlackListed[_from]); if (deprecated) { return UpgradedStandardToken(upgradedAddress).transferFromByLegacy(msg.sender, _from, _to, _value); } else { return super.transferFrom(_from, _to, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function balanceOf(address who) public constant returns (uint) { if (deprecated) { return UpgradedStandardToken(upgradedAddress).balanceOf(who); } else { return super.balanceOf(who); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function approve(address _spender, uint _value) public onlyPayloadSize(2 * 32) { if (deprecated) { return UpgradedStandardToken(upgradedAddress).approveByLegacy(msg.sender, _spender, _value); } else { return super.approve(_spender, _value); } } // Forward ERC20 methods to upgraded contract if this one is deprecated function allowance(address _owner, address _spender) public constant returns (uint remaining) { if (deprecated) { return StandardToken(upgradedAddress).allowance(_owner, _spender); } else { return super.allowance(_owner, _spender); } } // deprecate current contract in favour of a new one function deprecate(address _upgradedAddress) public onlyOwner { deprecated = true; upgradedAddress = _upgradedAddress; Deprecate(_upgradedAddress); } // deprecate current contract if favour of a new one function totalSupply() public constant returns (uint) { if (deprecated) { return StandardToken(upgradedAddress).totalSupply(); } else { return _totalSupply; } } // Issue a new amount of tokens // these tokens are deposited into the owner address // // @param _amount Number of tokens to be issued function issue(uint amount) public onlyOwner { require(_totalSupply + amount > _totalSupply); require(balances[owner] + amount > balances[owner]); balances[owner] += amount; _totalSupply += amount; Issue(amount); } // Redeem tokens. // These tokens are withdrawn from the owner address // if the balance must be enough to cover the redeem // or the call will fail. // @param _amount Number of tokens to be issued function redeem(uint amount) public onlyOwner { require(_totalSupply >= amount); require(balances[owner] >= amount); _totalSupply -= amount; balances[owner] -= amount; Redeem(amount); } function setParams(uint newBasisPoints, uint newMaxFee) public onlyOwner { // Ensure transparency by hardcoding limit beyond which fees can never be added require(newBasisPoints < 20); require(newMaxFee < 50); basisPointsRate = newBasisPoints; maximumFee = newMaxFee.mul(10**decimals); Params(basisPointsRate, maximumFee); } // Called when new token are issued event Issue(uint amount); // Called when tokens are redeemed event Redeem(uint amount); // Called when contract is deprecated event Deprecate(address newAddress); // Called if contract ever adds fees event Params(uint feeBasisPoints, uint maxFee); }
Contract Security Audit
- Callisto Network - July 10th, 2019 - Security Audit Report
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000000000000000000000000000000000174876e800000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000c00000000000000000000000000000000000000000000000000000000000000006000000000000000000000000000000000000000000000000000000000000000a546574686572205553440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000045553445400000000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _initialSupply (uint256): 100000000000
Arg [1] : _name (string): Tether USD
Arg [2] : _symbol (string): USDT
Arg [3] : _decimals (uint256): 6
-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000000000174876e800
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [3] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [4] : 000000000000000000000000000000000000000000000000000000000000000a
Arg [5] : 5465746865722055534400000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 5553445400000000000000000000000000000000000000000000000000000000
Swarm Source
bzzr://645ee12d73db47fd78ba77fa1f824c3c8f9184061b3b10386beb4dc9236abb28
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