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Transactions: 6 txns
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Contract Creator: 0x7d5c8c59837357e541bc7d87dee53fcbba55ba65at txn 0x05531d32fe5fdabb9cfdbd7865cbcccc7266125df47bbc4484dc26dd39312ed2
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TxHash Age From To Value [TxFee]
0x4ec3445cac6622da370887859a6616cc4267cc76e460b20325981b844c6c323c17 days 24 mins ago0x7d5c8c59837357e541bc7d87dee53fcbba55ba65  IN   0xf1ffed6fc40a76d978f26eaecdedecbe031dbd6a0 Ether0.00054998
0x9ea86cced5485c8f809c7f8f67a551ec929c38cd21a1c73ad2c52083ec4380ae49 days 44 mins ago0x0d02c5049f032757299142a007acbddab6d4733a  IN   0xf1ffed6fc40a76d978f26eaecdedecbe031dbd6a1.05 Ether0.0005923857
0xb2cae76ad41fe1ee81c2bbc43a6038e4aa264c752ae5d95b34735ca98752033455 days 11 hrs ago0x2bd78c47f25564dfbe26f5847f38898f4f4d5ffd  IN   0xf1ffed6fc40a76d978f26eaecdedecbe031dbd6a0.0008 Ether0.0000606375
0x2e36a8dd3d14488bc99e61026cf368589bfc4e444122a1f1f3b08cbda31e081555 days 13 hrs ago0x7d5c8c59837357e541bc7d87dee53fcbba55ba65  IN   0xf1ffed6fc40a76d978f26eaecdedecbe031dbd6a0.05 Ether0.000283412
0x5cce3ab8515cc1299bfbb97ccddbfcaf64b5924be13c616a2ea598b91762cae156 days 23 hrs ago0xa56fe8f2704ae10668e71106f5f21bcd5badc37f  IN   0xf1ffed6fc40a76d978f26eaecdedecbe031dbd6a0.01 Ether0.0002023875
0x05531d32fe5fdabb9cfdbd7865cbcccc7266125df47bbc4484dc26dd39312ed266 days 14 hrs ago0x7d5c8c59837357e541bc7d87dee53fcbba55ba65  IN    Contract Creation0 Ether0.03011082
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 Internal Transactions as a result of Contract Execution
 Latest 2 Internal Transactions

ParentTxHash Block Age From To Value
0x9ea86cced5485c8f809c7f8f67a551ec929c38cd21a1c73ad2c52083ec4380ae660377249 days 44 mins ago0xf1ffed6fc40a76d978f26eaecdedecbe031dbd6a0x7d5c8c59837357e541bc7d87dee53fcbba55ba651.05 Ether
0x2e36a8dd3d14488bc99e61026cf368589bfc4e444122a1f1f3b08cbda31e0815656385055 days 13 hrs ago0xf1ffed6fc40a76d978f26eaecdedecbe031dbd6a0x7d5c8c59837357e541bc7d87dee53fcbba55ba650.05 Ether
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), EventStructWrongData (very low-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: KnowTokenPreSale
Compiler Text: v0.4.24+commit.e67f0147
Optimization Enabled: No
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity^0.4.21;

library SafeMath {
    function mul(uint256 a, uint256 b) internal pure returns (uint256 c) {
        if (a == 0) {
            return 0;
        }
        c = a * b;
        assert(c / a == b);
        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }
    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 c) {
        c = a + b;
        assert(c >= a);
        return c;
    }
}

contract Ownable {
    mapping (uint256 => address) public owner;
    address[] public allOwner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() public {
        owner[0] = msg.sender;
        allOwner.push(msg.sender);
    }

    modifier onlyOwner() {
        require(msg.sender == owner[0] || msg.sender == owner[1] || msg.sender == owner[2]);
        _;
    }
    
    function addnewOwner(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        uint256 len = allOwner.length;
        owner[len] = newOwner;
        allOwner.push(newOwner);
    }

    function setNewOwner(address newOwner, uint position) public onlyOwner {
        require(newOwner != address(0));
        require(position == 1 || position == 2);
        owner[position] = newOwner;
    }

    function transferOwnership(address newOwner) public onlyOwner {
        require(newOwner != address(0));
        emit OwnershipTransferred(owner[0], newOwner);
        owner[0] = newOwner;
    }

}

contract ERC20 {
    function totalSupply() public view returns (uint256);
    function balanceOf(address who) public view returns (uint256);
    function transfer(address to, uint256 value) public;
    function allowance(address owner, address spender) public view returns (uint256);
    function transferFrom(address from, address to, uint256 value) public returns (bool);
    function approve(address spender, uint256 value) public returns (bool);

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Burn(address indexed from, uint256 value);
}

contract KNBaseToken is ERC20 {
    using SafeMath for uint256;
    
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 totalSupply_;

    mapping(address => uint256) balances;
    mapping (address => mapping (address => uint256)) internal allowed;

    constructor(string _name, string _symbol, uint8 _decimals, uint256 _totalSupply) public{
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        totalSupply_ = _totalSupply;
    }

    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

    function _transfer(address _from, address _to, uint256 _value) internal {
        require(_to != address(0));
        require(balances[_from] >= _value);
        require(balances[_to].add(_value) > balances[_to]);


        uint256 previousBalances = balances[_from].add(balances[_to]);
        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        emit Transfer(_from, _to, _value);

        assert(balances[_from].add(balances[_to]) == previousBalances);
    }

    function transfer(address _to, uint256 _value) public {
        _transfer(msg.sender, _to, _value);
    }

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
        require(_value <= allowed[_from][msg.sender]);     // Check allowance
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        _transfer(_from, _to, _value);
        return true;
    }

    function approve(address _spender, uint256 _value) public returns (bool) {
        allowed[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) public view returns (uint256) {
        return allowed[_owner][_spender];
    }

    function burn(uint256 _value) public returns (bool success) {
        require(balances[msg.sender] >= _value);
        balances[msg.sender] = balances[msg.sender].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit Burn(msg.sender, _value);
        return true;
    }

    function burnFrom(address _from, uint256 _value) public returns (bool success) {
        require(balances[_from] >= _value);
        require(_value <= allowed[_from][msg.sender]);

        balances[_from] = balances[_from].sub(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);
        emit Burn(msg.sender, _value);
        return true;
    }
}

contract KnowToken is KNBaseToken("Know Token", "KN", 18, 7795482309000000000000000000), Ownable {

    uint256 internal privateToken = 389774115000000000000000000;
    uint256 internal preSaleToken = 1169322346000000000000000000;
    uint256 internal crowdSaleToken = 3897741155000000000000000000;
    uint256 internal bountyToken;
    uint256 internal foundationToken;
    address public founderAddress;
    bool public unlockAllTokens;

    mapping (address => bool) public frozenAccount;

    event FrozenFunds(address target, bool unfrozen);
    event UnLockAllTokens(bool unlock);

    constructor() public {
        founderAddress = msg.sender;
        balances[founderAddress] = totalSupply_;
        emit Transfer(address(0), founderAddress, totalSupply_);
    }

    function _transfer(address _from, address _to, uint _value) internal {
        require (_to != address(0));                               
        require (balances[_from] >= _value);               
        require (balances[_to].add(_value) >= balances[_to]); 
        require(!frozenAccount[_from] || unlockAllTokens);

        balances[_from] = balances[_from].sub(_value);                  
        balances[_to] = balances[_to].add(_value);                  
        emit Transfer(_from, _to, _value);
    }

    function unlockAllTokens(bool _unlock) public onlyOwner {
        unlockAllTokens = _unlock;
        emit UnLockAllTokens(_unlock);
    }

    function freezeAccount(address target, bool freeze) public onlyOwner {
        frozenAccount[target] = freeze;
        emit FrozenFunds(target, freeze);
    }
}

contract KnowTokenPreSale is Ownable{
    using SafeMath for uint256;

    KnowToken public token;
    address public wallet;
    uint256 public currentRate;
    uint256 public limitTokenForSale;

    event ChangeRate(address indexed who, uint256 newrate);
    event FinishPreSale();

    constructor() public {
        currentRate = 26667;
        wallet = msg.sender; //address of founder
        limitTokenForSale = 389774115000000000000000000;
        token = KnowToken(0xbfd18F20423694a69e35d65cB9c9D74396CC2c2d);// address of KN Token
    }

    function changeRate(uint256 newrate) public onlyOwner{
        require(newrate > 0);
        currentRate = newrate;

        emit ChangeRate(msg.sender, newrate);
    }

    function remainTokens() view public returns(uint256) {
        return token.balanceOf(this);
    }

    function finish() public onlyOwner {
        uint256 reTokens = remainTokens();
        token.transfer(owner[0], reTokens);
        
        emit FinishPreSale();
    }

    function () public payable {
        assert(msg.value > 0 ether);
        
        uint256 tokens = currentRate.mul(msg.value);
        token.transfer(msg.sender, tokens);
        token.freezeAccount(msg.sender, true);        
        wallet.transfer(msg.value);       
    }  
}

    Contract ABI  
[{"constant":true,"inputs":[],"name":"limitTokenForSale","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"addnewOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"wallet","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"},{"name":"position","type":"uint256"}],"name":"setNewOwner","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newrate","type":"uint256"}],"name":"changeRate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"remainTokens","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"finish","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"allOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"currentRate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"token","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"who","type":"address"},{"indexed":false,"name":"newrate","type":"uint256"}],"name":"ChangeRate","type":"event"},{"anonymous":false,"inputs":[],"name":"FinishPreSale","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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   Swarm Source:
bzzr://18c2d7d464ef56dab5fb0a3e17f04e46e760dc404f066f36afd6f15d3cbbbdf8

 

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