NvirWorldToken
Deploy on Alchemy
Verified
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Ethereum
Contract Information
The following smart contract is for NvirWorldToken, an ERC20 token. It includes functions for transferring tokens, approving transfers, checking balances, and allowing contracts to spend tokens on behalf of users. The contract also includes a function for transferring any ERC20 token owned by the contract owner.
More Info
/**
*Submitted for verification at Etherscan.io on 2021-11-03
*/
pragma solidity ^0.4.26;
contract SafeMath {
function safeAdd(uint256 a, uint256 b) public pure returns (uint256 c) {
c = a + b;
require(c >= a);
}
function safeSub(uint256 a, uint256 b) public pure returns (uint256 c) {
require(b <= a);
c = a - b;
}
function safeMul(uint256 a, uint256 b) public pure returns (uint256 c) {
c = a * b;
require(a == 0 || c / a == b);
}
function safeDiv(uint256 a, uint256 b) public pure returns (uint256 c) {
require(b > 0);
c = a / b;
}
}
contract ApproveAndCallFallBack {
function receiveApproval(address from, uint256 tokens, address token, bytes data) public;
}
contract Owned {
address public owner;
address public newOwner;
event OwnershipTransferred(address indexed _from, address indexed _to);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address _newOwner) public onlyOwner {
newOwner = _newOwner;
}
function acceptOwnership() public {
require(msg.sender == newOwner);
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
newOwner = address(0);
}
}
contract NvirWorldToken is Owned, SafeMath {
string public symbol;
string public name;
uint8 public decimals;
uint256 public _totalSupply;
mapping(address => uint256) balances;
mapping(address => mapping(address => uint256)) allowed;
event Transfer(address indexed from, address indexed to, uint256 tokens);
event Approval(address indexed tokenOwner, address indexed spender, uint256 tokens);
// ------------------------------------------------------------------------
// Constructor
// ------------------------------------------------------------------------
constructor() public {
symbol = "Nvir";
name = "NvirWorld";
decimals = 18;
_totalSupply = 10700000000000000000000000000;
balances[owner] = _totalSupply;
emit Transfer(address(0), owner, _totalSupply);
}
function totalSupply() external constant returns (uint256) {
return _totalSupply - balances[address(0)];
}
function balanceOf(address tokenOwner) external constant returns (uint256 balance) {
return balances[tokenOwner];
}
function transfer(address to, uint256 tokens) external returns (bool success) {
balances[msg.sender] = safeSub(balances[msg.sender], tokens);
balances[to] = safeAdd(balances[to], tokens);
emit Transfer(msg.sender, to, tokens);
return true;
}
function approve(address spender, uint256 tokens) external returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
return true;
}
function transferFrom(address from, address to, uint256 tokens) external returns (bool success) {
balances[from] = safeSub(balances[from], tokens);
allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens);
balances[to] = safeAdd(balances[to], tokens);
emit Transfer(from, to, tokens);
return true;
}
function allowance(address tokenOwner, address spender) external constant returns (uint256 remaining) {
return allowed[tokenOwner][spender];
}
function approveAndCall(address spender, uint256 tokens, bytes data) external returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);
return true;
}
function () external payable {
revert();
}
function transferAnyERC20Token(uint256 tokens) external onlyOwner returns (bool success) {
return this.transfer(owner, tokens);
}
}
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