ETH Price: $3,384.76 (+1.18%)

Contract

0xF6B55acBBC49f4524Aa48D19281A9A77c54DE10f
 

Multichain Info

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Method
Block
From
To
Transfer163586072023-01-08 0:52:23720 days ago1673139143IN
Wolk Token
0 ETH0.0006475613.49966896
Transfer156811732022-10-05 10:00:59815 days ago1664964059IN
Wolk Token
0 ETH0.000262984.98139674
Transfer148785952022-05-31 12:08:17942 days ago1653998897IN
Wolk Token
0 ETH0.0010796622.49637114
Transfer143860892022-03-14 17:27:591019 days ago1647278879IN
Wolk Token
0 ETH0.0036194968.57575891
Transfer140103302022-01-15 13:38:031078 days ago1642253883IN
Wolk Token
0 ETH0.0044021791.72537344
Transfer138685952021-12-24 15:06:391100 days ago1640358399IN
Wolk Token
0 ETH0.0030204862.93593299
Approve120884002021-03-22 11:37:521377 days ago1616413072IN
Wolk Token
0 ETH0.00519328115
Transfer120049592021-03-09 14:58:581390 days ago1615301938IN
Wolk Token
0 ETH0.00471113124
Transfer119206812021-02-24 15:34:571403 days ago1614180897IN
Wolk Token
0 ETH0.01914242504
Transfer117304222021-01-26 9:17:051432 days ago1611652625IN
Wolk Token
0 ETH0.0047601189.84572221
Approve116687192021-01-16 21:31:231441 days ago1610832683IN
Wolk Token
0 ETH0.0022585550
Approve116685922021-01-16 21:04:211441 days ago1610831061IN
Wolk Token
0 ETH0.0018068440
Approve115290472020-12-26 11:26:161463 days ago1608981976IN
Wolk Token
0 ETH0.0020784146
Transfer111372082020-10-27 7:25:051523 days ago1603783505IN
Wolk Token
0 ETH0.0008738323.00000145
Approve107302752020-08-25 15:03:261586 days ago1598367806IN
Wolk Token
0 ETH0.00163461112.6
Approve106977952020-08-20 15:12:041591 days ago1597936324IN
Wolk Token
0 ETH0.00551086122
Approve106959532020-08-20 8:20:131591 days ago1597911613IN
Wolk Token
0 ETH0.00469653104
Approve103147072020-06-22 9:18:121650 days ago1592817492IN
Wolk Token
0 ETH0.0010386523
Transfer103145532020-06-22 8:46:581650 days ago1592815618IN
Wolk Token
0 ETH0.0024376746
Transfer102528532020-06-12 19:46:421659 days ago1591991202IN
Wolk Token
0 ETH0.0008819923.2
Approve102423392020-06-11 4:42:061661 days ago1591850526IN
Wolk Token
0 ETH0.000903920
Approve102311062020-06-09 10:58:571663 days ago1591700337IN
Wolk Token
0 ETH0.000903920
Transfer102310252020-06-09 10:40:231663 days ago1591699223IN
Wolk Token
0 ETH0.0011955931.46875
Transfer102309212020-06-09 10:21:041663 days ago1591698064IN
Wolk Token
0 ETH0.0020899139.4375
Approve99138442020-04-21 5:10:371712 days ago1587445837IN
Wolk Token
0 ETH0.000361568
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Latest 25 internal transactions (View All)

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Parent Transaction Hash Block
From
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49329632018-01-19 4:55:482535 days ago1516337748
Wolk Token
Wolk Token
0.01 ETH
49314962018-01-18 22:42:082535 days ago1516315328
Wolk Token
212.72961946 ETH
49094572018-01-14 22:49:302539 days ago1515970170
Wolk Token
Wolk Token
84 ETH
49094432018-01-14 22:46:472539 days ago1515970007
Wolk Token
Wolk Token
1 ETH
49092612018-01-14 22:06:432539 days ago1515967603
Wolk Token
100 ETH
49092562018-01-14 22:05:142539 days ago1515967514
Wolk Token
100 ETH
49092502018-01-14 22:03:422539 days ago1515967422
Wolk Token
100 ETH
49092442018-01-14 22:01:372539 days ago1515967297
Wolk Token
100 ETH
49053912018-01-14 5:34:272540 days ago1515908067
Wolk Token
Wolk Token
3.44552771 ETH
49048842018-01-14 3:21:272540 days ago1515900087
Wolk Token
Wolk Token
3.44 ETH
48991062018-01-13 1:53:532541 days ago1515808433
Wolk Token
4.75745066 ETH
48968112018-01-12 15:54:152542 days ago1515772455
Wolk Token
4.75073221 ETH
48961232018-01-12 12:47:572542 days ago1515761277
Wolk Token
Wolk Token
2.5 ETH
48953572018-01-12 9:21:302542 days ago1515748890
Wolk Token
2.20630262 ETH
48946992018-01-12 6:23:382542 days ago1515738218
Wolk Token
Wolk Token
10 ETH
48935762018-01-12 1:23:132542 days ago1515720193
Wolk Token
0.99848631 ETH
48893432018-01-11 6:37:142543 days ago1515652634
Wolk Token
3.42153096 ETH
48880612018-01-11 0:58:112543 days ago1515632291
Wolk Token
19.20851959 ETH
48880302018-01-11 0:52:592543 days ago1515631979
Wolk Token
21.68787133 ETH
48875652018-01-10 22:42:372543 days ago1515624157
Wolk Token
7.96439002 ETH
48875372018-01-10 22:35:012543 days ago1515623701
Wolk Token
15.66483708 ETH
48875062018-01-10 22:26:442543 days ago1515623204
Wolk Token
32.4196045 ETH
48853632018-01-10 13:03:042544 days ago1515589384
Wolk Token
Wolk Token
0.01 ETH
48849312018-01-10 11:16:292544 days ago1515582989
Wolk Token
3.33302322 ETH
48809712018-01-09 17:27:102544 days ago1515518830
Wolk Token
Wolk Token
0.01154 ETH
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Contract Source Code Verified (Exact Match)

Contract Name:
WolkExchange

Compiler Version
v0.4.17+commit.bdeb9e52

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2017-10-15
*/

pragma solidity ^0.4.16;

// SafeMath Taken From FirstBlood
contract SafeMath {
    function safeMul(uint a, uint b) internal returns (uint) {
        uint c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

    function safeDiv(uint a, uint b) internal returns (uint) {
        assert(b > 0);
        uint c = a / b;
        assert(a == b * c + a % b);
        return c;
    }

    function safeSub(uint a, uint b) internal returns (uint) {
        assert(b <= a);
        return a - b;
    }

    function safeAdd(uint a, uint b) internal returns (uint) {
        uint c = a + b;
        assert(c>=a && c>=b);
        return c;
    }
}

// Ownership
contract Owned {

    address public owner;
    address public newOwner;
    modifier onlyOwner { assert(msg.sender == owner); _; }

    event OwnerUpdate(address _prevOwner, address _newOwner);

    function Owned() {
        owner = msg.sender;
    }

    function transferOwnership(address _newOwner) public onlyOwner {
        require(_newOwner != owner);
        newOwner = _newOwner;
    }

    function acceptOwnership() public {
        require(msg.sender == newOwner);
        OwnerUpdate(owner, newOwner);
        owner = newOwner;
        newOwner = 0x0;
    }
}

// ERC20 Interface
contract ERC20 {
    function totalSupply() constant returns (uint _totalSupply);
    function balanceOf(address _owner) constant returns (uint balance);
    function transfer(address _to, uint _value) returns (bool success);
    function transferFrom(address _from, address _to, uint _value) returns (bool success);
    function approve(address _spender, uint _value) returns (bool success);
    function allowance(address _owner, address _spender) constant returns (uint remaining);
    event Transfer(address indexed _from, address indexed _to, uint _value);
    event Approval(address indexed _owner, address indexed _spender, uint _value);
}

// ERC20Token
contract ERC20Token is ERC20, SafeMath {

    mapping(address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    uint256 public totalTokens; 
    uint256 public contributorTokens; 

    function transfer(address _to, uint256 _value) returns (bool success) {
        if (balances[msg.sender] >= _value && _value > 0) {
            balances[msg.sender] = safeSub(balances[msg.sender], _value);
            balances[_to] = safeAdd(balances[_to], _value);
            Transfer(msg.sender, _to, _value);
            return true;
        } else {
            return false;
        }
    }

    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        var _allowance = allowed[_from][msg.sender];
        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
            balances[_to] = safeAdd(balances[_to], _value);
            balances[_from] = safeSub(balances[_from], _value);
            allowed[_from][msg.sender] = safeSub(_allowance, _value);
            Transfer(_from, _to, _value);
            return true;
        } else {
            return false;
        }
    }

    function totalSupply() constant returns (uint256) {
        return totalTokens;
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        require((_value == 0) || (allowed[msg.sender][_spender] == 0));
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

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

}

contract Wolk is ERC20Token, Owned {

    // TOKEN INFO
    string  public constant name = "WOLK TOKEN";
    string  public constant symbol = "WLK";
    uint256 public constant decimals = 18;

    // RESERVE
    uint256 public reserveBalance = 0; 
    uint8   public percentageETHReserve = 5;

    // CONTRACT OWNER
    address public wolkInc;

    // TOKEN GENERATION CONTROL
    bool    public allSaleCompleted = false;

    modifier isTransferable { require(allSaleCompleted); _; }

    // TOKEN GENERATION EVENTLOG
    event WolkCreated(address indexed _to, uint256 _tokenCreated);
    event WolkDestroyed(address indexed _from, uint256 _tokenDestroyed);
    event LogRefund(address indexed _to, uint256 _value);
}

contract WolkTGE is Wolk {

    // TOKEN GENERATION EVENT
    mapping (address => uint256) contribution;
    mapping (address => bool) whitelistContributor;
    
    uint256 public constant tokenGenerationMin =   1 * 10**4 * 10**decimals;
    uint256 public constant tokenGenerationMax = 175 * 10**5 * 10**decimals;
    uint256 public start_block;
    uint256 public end_time;
    bool    kycRequirement = true;

    // @param _startBlock
    // @param _endTime
    // @param _wolkinc - wolk inc tokens sent here
    // @return success
    // @dev Wolk Genesis Event [only accessible by Contract Owner]
    function wolkGenesis(uint256 _startBlock, uint256 _endTime, address _wolkinc) onlyOwner returns (bool success){
        require((totalTokens < 1) && (block.number <= _startBlock)); 
        start_block = _startBlock;
        end_time = _endTime;
        wolkInc = _wolkinc;
        return true;
    }
    
    // @param _participants
    // @return success
    function updateRequireKYC(bool _kycRequirement) onlyOwner returns (bool success) {
        kycRequirement = _kycRequirement;
        return true;
    } 
    
    // @param _participants
    // @return success
    function addParticipant(address[] _participants) onlyOwner returns (bool success) {
        for (uint cnt = 0; cnt < _participants.length; cnt++){           
            whitelistContributor[_participants[cnt]] = true;
        }
        return true;
    } 

    // @param _participants
    // @return success
    // @dev Revoke designated contributors [only accessible by current Contract Owner]
    function removeParticipant(address[] _participants) onlyOwner returns (bool success){         
        for (uint cnt = 0; cnt < _participants.length; cnt++){           
            whitelistContributor[_participants[cnt]] = false;
        }
        return true;
    }

    // @param _participant
    // @return status
    // @dev return status of given address
    function participantStatus(address _participant) constant returns (bool status) {
        return(whitelistContributor[_participant]);
    }    

    // @param _participant
    // @dev use tokenGenerationEvent to handle sale of WOLK
    function tokenGenerationEvent(address _participant) payable external {
        require( ( whitelistContributor[_participant] || whitelistContributor[msg.sender] || balances[_participant] > 0 || kycRequirement )  && !allSaleCompleted && ( block.timestamp <= end_time ) && msg.value > 0);
    
        uint256 rate = 1000;  // Default Rate
        rate = safeDiv( 175 * 10**5 * 10**decimals, safeAdd( 875 * 10**1 * 10**decimals, safeDiv( totalTokens, 2 * 10**3)) );
        if ( rate > 2000 ) rate = 2000;
        if ( rate < 500 ) rate = 500;
        require(block.number >= start_block) ;

        uint256 tokens = safeMul(msg.value, rate);
        uint256 checkedSupply = safeAdd(totalTokens, tokens);
        require(checkedSupply <= tokenGenerationMax);

        totalTokens = checkedSupply;
        contributorTokens = safeAdd(contributorTokens, tokens);
        
        Transfer(address(this), _participant, tokens);
        balances[_participant] = safeAdd(balances[_participant], tokens);
        contribution[_participant] = safeAdd(contribution[_participant], msg.value);
        WolkCreated(_participant, tokens); // logs token creation
    }

    function finalize() onlyOwner external {
        require(!allSaleCompleted);
        end_time = block.timestamp;

        // 50MM Wolk allocated to Wolk Inc for development
        uint256 wolkincTokens =  50 * 10**6 * 10**decimals;
        balances[wolkInc] = wolkincTokens;
        totalTokens = safeAdd(totalTokens, wolkincTokens);                 

        WolkCreated(wolkInc, wolkincTokens); // logs token creation 
        allSaleCompleted = true;
        reserveBalance = safeDiv(safeMul(contributorTokens, percentageETHReserve), 100000);
        var withdrawalBalance = safeSub(this.balance, reserveBalance);
        msg.sender.transfer(withdrawalBalance);
    }

    function refund() external {
        require((contribution[msg.sender] > 0) && (!allSaleCompleted) && (block.timestamp > end_time)  && (totalTokens < tokenGenerationMin));
        uint256 tokenBalance = balances[msg.sender];
        uint256 refundBalance = contribution[msg.sender];
        balances[msg.sender] = 0;
        contribution[msg.sender] = 0;
        totalTokens = safeSub(totalTokens, tokenBalance);
        WolkDestroyed(msg.sender, tokenBalance);
        LogRefund(msg.sender, refundBalance);
        msg.sender.transfer(refundBalance); 
    }

    function transferAnyERC20Token(address _tokenAddress, uint256 _amount) onlyOwner returns (bool success) {
        return ERC20(_tokenAddress).transfer(owner, _amount);
    }
}

// Taken from https://github.com/bancorprotocol/contracts/blob/master/solidity/contracts/BancorFormula.sol
contract IBancorFormula {
    function calculatePurchaseReturn(uint256 _supply, uint256 _reserveBalance, uint8 _reserveRatio, uint256 _depositAmount) public constant returns (uint256);
    function calculateSaleReturn(uint256 _supply, uint256 _reserveBalance, uint8 _reserveRatio, uint256 _sellAmount) public constant returns (uint256);
}

contract WolkExchange is  WolkTGE {
    address public exchangeFormula;
    bool    public isPurchasePossible = false;
    bool    public isSellPossible = false;

    modifier isPurchasable { require(isPurchasePossible && allSaleCompleted); _; }
    modifier isSellable { require(isSellPossible && allSaleCompleted); _; }
    
    // @param  _newExchangeformula
    // @return success
    // @dev Set the bancor formula to use -- only Wolk Inc can set this
    function setExchangeFormula(address _newExchangeformula) onlyOwner returns (bool success){
        require(sellWolkEstimate(10**decimals, _newExchangeformula) > 0);
        require(purchaseWolkEstimate(10**decimals, _newExchangeformula) > 0);
        isPurchasePossible = false;
        isSellPossible = false;
        exchangeFormula = _newExchangeformula;
        return true;
    }

    // @param  _newReserveRatio
    // @return success
    // @dev Set the reserve ratio in case of emergency -- only Wolk Inc can set this
    function updateReserveRatio(uint8 _newReserveRatio) onlyOwner returns (bool success) {
        require(allSaleCompleted && ( _newReserveRatio > 1 ) && ( _newReserveRatio < 20 ) );
        percentageETHReserve = _newReserveRatio;
        return true;
    }

    // @param  _isRunning
    // @return success
    // @dev updating isPurchasePossible -- only Wolk Inc can set this
    function updatePurchasePossible(bool _isRunning) onlyOwner returns (bool success){
        if (_isRunning){
            require(sellWolkEstimate(10**decimals, exchangeFormula) > 0);
            require(purchaseWolkEstimate(10**decimals, exchangeFormula) > 0);   
        }
        isPurchasePossible = _isRunning;
        return true;
    }

    // @param  _isRunning
    // @return success
    // @dev updating isSellPossible -- only Wolk Inc can set this
    function updateSellPossible(bool _isRunning) onlyOwner returns (bool success){
        if (_isRunning){
            require(sellWolkEstimate(10**decimals, exchangeFormula) > 0);
            require(purchaseWolkEstimate(10**decimals, exchangeFormula) > 0);   
        }
        isSellPossible = _isRunning;
        return true;
    }

    function sellWolkEstimate(uint256 _wolkAmountest, address _formula) internal returns(uint256) {
        uint256 ethReceivable =  IBancorFormula(_formula).calculateSaleReturn(contributorTokens, reserveBalance, percentageETHReserve, _wolkAmountest);
        return ethReceivable;
    }
    
    function purchaseWolkEstimate(uint256 _ethAmountest, address _formula) internal returns(uint256) {
        uint256 wolkReceivable = IBancorFormula(_formula).calculatePurchaseReturn(contributorTokens, reserveBalance, percentageETHReserve, _ethAmountest);
        return wolkReceivable;
    }
    
    // @param _wolkAmount
    // @return ethReceivable
    // @dev send Wolk into contract in exchange for eth, at an exchange rate based on the Bancor Protocol derivation and decrease totalSupply accordingly
    function sellWolk(uint256 _wolkAmount) isSellable() returns(uint256) {
        require((balances[msg.sender] >= _wolkAmount));
        uint256 ethReceivable = sellWolkEstimate(_wolkAmount,exchangeFormula);
        require(this.balance > ethReceivable);
        balances[msg.sender] = safeSub(balances[msg.sender], _wolkAmount);
        contributorTokens = safeSub(contributorTokens, _wolkAmount);
        totalTokens = safeSub(totalTokens, _wolkAmount);
        reserveBalance = safeSub(this.balance, ethReceivable);
        WolkDestroyed(msg.sender, _wolkAmount);
        Transfer(msg.sender, 0x00000000000000000000, _wolkAmount);
        msg.sender.transfer(ethReceivable);
        return ethReceivable;     
    }

    // @return wolkReceivable    
    // @dev send eth into contract in exchange for Wolk tokens, at an exchange rate based on the Bancor Protocol derivation and increase totalSupply accordingly
    function purchaseWolk(address _buyer) isPurchasable() payable returns(uint256){
        require(msg.value > 0);
        uint256 wolkReceivable = purchaseWolkEstimate(msg.value, exchangeFormula);
        require(wolkReceivable > 0);

        contributorTokens = safeAdd(contributorTokens, wolkReceivable);
        totalTokens = safeAdd(totalTokens, wolkReceivable);
        balances[_buyer] = safeAdd(balances[_buyer], wolkReceivable);
        reserveBalance = safeAdd(reserveBalance, msg.value);
        WolkCreated(_buyer, wolkReceivable);
        Transfer(address(this),_buyer,wolkReceivable);
        return wolkReceivable;
    }

    // @dev  fallback function for purchase
    // @note Automatically fallback to tokenGenerationEvent before sale is completed. After the token generation event, fallback to purchaseWolk. Liquidity exchange will be enabled through updateExchangeStatus  
    function () payable {
        require(msg.value > 0);
        if(!allSaleCompleted){
            this.tokenGenerationEvent.value(msg.value)(msg.sender);
        } else if ( block.timestamp >= end_time ){
            this.purchaseWolk.value(msg.value)(msg.sender);
        } else {
            revert();
        }
    }
}

Contract Security Audit

Contract ABI

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bzzr://9aaada50c1671511e7d4a6f65fcfba9395b602433a033c0d707bfb0dbd61a650

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.