Latest 25 transactions from a total of 2050 transactions

TxHash Age From To Value [TxFee]
0x8847ca1a13e109d76dd47d1226e8f579f631651c5f88eff7ba23d2b84d35de006 days 13 hrs ago0xf16f0a13a20b1eed9aef167c2fa6116317a3e165  IN   WolkServicesToken0 Ether0.00022599
0x20cd2c4d54fddd06859cc8c437bd4705f57bc4d03cd5207d17cad3e7bb1e50396 days 14 hrs ago0xf16f0a13a20b1eed9aef167c2fa6116317a3e165  IN   WolkServicesToken0 Ether0.000263005
0xb03576bf6db284e6f7c922c5d95b9b5f9f822dbafabbaedbe28e4b25cc940cfb6 days 14 hrs ago0xf16f0a13a20b1eed9aef167c2fa6116317a3e165  IN   WolkServicesToken0 Ether0.000263005
0x90e625b5fdc9b58c15ff42cb94c91a246b6360f903d961a411dbf65107abed748 days 7 hrs ago0x95ce7dccf1b39424da09e7fcc97032ccc4a40c11  IN   WolkServicesToken0 Ether0.000096820854
0xbaf69460a8d8d1b7048638f872713113a05b4d6fe87e39b64f9ecec3b8e284b68 days 7 hrs ago0x3cd4be83e14c24b063480ab4fa36c49b8df3467f  IN   WolkServicesToken0 Ether0.000096820854
0xaa809699e8b98765cdb27d35536ef9bc860b2c0b79ea929be21537aace4dfa2211 days 23 hrs ago0x5ab9d116a53ef41063e3eae26a7ebe736720e9ba  IN   WolkServicesToken0 Ether0.0004597
0x44cbba0ad09f3c87e5f8cc2db0b59abff87c7268e080fc2f085744b952add5ac14 days 19 hrs ago0xd2dbde4b4424a24625020a533a5370b8a3f7d9e6  IN   WolkServicesToken0 Ether0.000072973354
0xe679cafa025526f93a4c72e413945bb454a79880b96d98c359adaf64fc02942b14 days 19 hrs ago0xf62b113f19e870178653b253c07567e2b3ed15a7  IN   WolkServicesToken0 Ether0.000072973354
0x77a679f0443893cebfb4eb0b05347fc3af2331312cf9754c9f04181d6d17698315 days 13 hrs ago0x65c700e67f3e258470518707a65c1161ef77e202  IN   WolkServicesToken0 Ether0.000072973354
0x17f29fa3d3dcbc1dbe52323b6328ac99a48b87568142c73603925c01554c211823 days 5 hrs agoHitBTC_2  IN   WolkServicesToken0 Ether0.000302856
0xe323ec2ad90a86fa134a23355893de0df9d1fc03400cfb40c5d1b1e3b1e4712423 days 5 hrs agoHitBTC_3  IN   WolkServicesToken0 Ether0.00037857
0xe3fd885009f1408a40359b4bc5290cbf96a7b8b1dbd766a96646f33e9770a50d25 days 19 hrs ago0x5ab9d116a53ef41063e3eae26a7ebe736720e9ba  IN   WolkServicesToken0 Ether0.0004597
0xef54e657a587c14667845d71472354308088afa808b91050c7063d0ed74d09e325 days 23 hrs ago0x5ab9d116a53ef41063e3eae26a7ebe736720e9ba  IN   WolkServicesToken0 Ether0.0004597
0xa928c7a360d1f10f206a86d0d807a3ba5208d4aac93a7618515ee9f77ec2057126 days 6 hrs ago0x25a148a29d2e52ff607f8107490dc0b80da23d00  IN   WolkServicesToken0 Ether0.000414855
0x23afec4542617f27adf0c1d12de219dbf5cac4d6b6674ce36251bef49826597526 days 6 hrs ago0x5ab9d116a53ef41063e3eae26a7ebe736720e9ba  IN   WolkServicesToken0 Ether0.0007597
0x8c609087b338ab712a47f4c6bf7f1ceb911f39a87ea33b8bc3617e957ef6b50b26 days 17 hrs ago0x4d23c0d4620af023f459476f627cf70ee3d451a2  IN   WolkServicesToken0 Ether0.000340137
0xf4ab7163dfc3d013acb722de194a24e7ef940687f61ef4bb5cc6d4bd4ba0972626 days 17 hrs ago0x9c7c587a102ce571c5ea4483b744b840393b624d  IN   WolkServicesToken0 Ether0.000188645
0xb10c5b1e48f5bc64b6e3cb1627674ab2f83e546ce4b9819b4e2fab328c67ce1f26 days 19 hrs ago0x4d23c0d4620af023f459476f627cf70ee3d451a2  IN   WolkServicesToken0 Ether0.000415723
0x2a46dcd7f22adcc4c8c92288330631a4cc569a445a14f5fc7faed8c2bf4f1f2d27 days 7 hrs ago0xa8282a3d5c9699a3e5e8d387c8e2f51fc8110389  IN   WolkServicesToken0 Ether0.000739102
0x0e9e23bba486bc2acca14b11a939917a3513121eaee53fbfc4d7dc4f8805cc3827 days 17 hrs ago0x4d23c0d4620af023f459476f627cf70ee3d451a2  IN   WolkServicesToken0 Ether0.000316758
0x210a5a8693cf4de4e319d51aa005c4b19f9e85d259bd10e55cd498417cdeeaf927 days 17 hrs ago0x4d23c0d4620af023f459476f627cf70ee3d451a2  IN   WolkServicesToken0 Ether0.000369999
0xa3e35765d36a0a3a2c837dce6c325936fc66bfa0b4e7ec4200ff6776d6c9b07131 days 16 hrs ago0x01dfb7e8dbeb859c3ae329c50a36f0d185b4b49e  IN   WolkServicesToken0 Ether0.000265447
0xc878824bf5dde4db991b6e53f2cc66cfe8c1a64092e41651a2c26dc01d96c79832 days 2 hrs agoHitBTC_2  IN   WolkServicesToken0 Ether0.000340713
0xaf50c33b3ead1a7f5b64003e400e0c76e9f341f8319f5f52e169d64e900f19d432 days 2 hrs agoHitBTC_3  IN   WolkServicesToken0 Ether0.0001476423
0xe1edd48e5df6140e037bd5d35b86b845db36bc680f3c231c7f26ee326c6d39bf38 days 18 hrs ago0xaeec6f5aca72f3a005af1b3420ab8c8c7009bac8  IN   WolkServicesToken0 Ether0.001289314
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 Internal Transactions as a result of Contract Execution
 Latest 25 Internal Txns, Click here To View More View All
ParentTxHash Block Age From To Value
0xae01bc864ed228ad11b1b78fc9cfe660b56d28a0d7d35796bfad3fa4e8206d0e4932963369 days 8 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0.01 Ether
0x9b8a1b0aa3d3e41462d0ebfee51c595737a52d570ecedfacf242ed862fe2a6114931496369 days 14 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0x34c7fc051eae78f8c37b82387a50a5458b8f7018212.729619468835183702 Ether
0xe9f1883b55da0d51ba52b4db2ce6ec62b8475334527b842f3cc0ff38efdda60f4909457373 days 14 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f84 Ether
0x42e4150b3f236f84965430063b59410890a52b2db4e2944a735a49b71f84c1cb4909443373 days 14 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f1 Ether
0x4eaaffe304eebd4532e08b5b0da735e1907e4ef0819fb33191e7c66a2cded75c4909261373 days 15 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0x5deac9106e060e11bdc1496422afcdd8bd63e3e2100 Ether
0xdf8aeec127073f08d5b15163f81642c97d3e406202d0684dc53a8f8f067dbca14909256373 days 15 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0x5deac9106e060e11bdc1496422afcdd8bd63e3e2100 Ether
0xa662e8448b7a4ea90beda4b1811daf4ca0c0bb565956c952cfdf738fe1c0b8544909250373 days 15 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0x5deac9106e060e11bdc1496422afcdd8bd63e3e2100 Ether
0x44f10ba6c6b2e3a5da59b82a1c06095d4534d66e203bf0034a72746dec4a2a654909244373 days 15 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0x5deac9106e060e11bdc1496422afcdd8bd63e3e2100 Ether
0x2997f1fa78e9ac28119473a5ca24c3fcf11762c31da81f7494b0fc6bd7d471434905391374 days 7 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f3.44552771 Ether
0x5a0267f0fef868da7c37b219ee29bb00f0eecb8a884309eec6a8230c7cad16364904884374 days 10 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f3.44 Ether
0xd7eb145045edeea51ea384e29639dad1711d08c9cffda79ddf5b82860374bda14899106375 days 11 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xb56d39b5e5f14b1b2e7b4548006110d6125e75e94.757450664989115001 Ether
0x067c2f6c1dad199abfba3e8565265cc8cf146192c615a5fe568fcbcba773e6364896811375 days 21 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xb56d39b5e5f14b1b2e7b4548006110d6125e75e94.750732213875174117 Ether
0x97561db719e54dfc2008492fdb3f426d06973539d10d8257680306bb0424340d4896123376 days 37 mins ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f2.5 Ether
0xbc0a25307b6912dcbc5e747b28790226e12fc92f899299807474db38420abbfe4895357376 days 4 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xfa6a28a4e1266b46af92ac1b4a29a05be2d5fb9a2.206302623504938284 Ether
0x5d83ff046d35ffe35175d11a3f6124d619a1bb2c5a70ff2ddac1d356986d70ce4894699376 days 7 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f10 Ether
0xff9fffd8f96835a022a1020e0dab120ce6aa8cbcb0f521f12a8a7c71593345794893576376 days 12 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xfa6a28a4e1266b46af92ac1b4a29a05be2d5fb9a0.998486317988743887 Ether
0x6680f25937aee012e8ef34dd2a2db12adf43d8977e4c4f12d3a83819116e713b4889343377 days 6 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xb56d39b5e5f14b1b2e7b4548006110d6125e75e93.421530961843722646 Ether
0x5b5a9629b094c6700a0c825e0c3340b15dc20e6e341c0b79f14aae5db78ae42b4888061377 days 12 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0x5b12a097af318729848a204294446e17766e2fac19.20851959577136645 Ether
0xe2e2cc3aff26c5462ddfcbe4425d91fae78ebc504f1069acd39b3e46e88990f04888030377 days 12 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0x5b12a097af318729848a204294446e17766e2fac21.68787133783759598 Ether
0x10e17e8e66cc18a195d353e15587ec36a3aad2a2533fb7f046aee089bccf0cdd4887565377 days 14 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xb56d39b5e5f14b1b2e7b4548006110d6125e75e97.964390021233105109 Ether
0x375dd309eebe08853b1f9d54cd5313c4dd9b74ae92cbb68eb656c0ee6f3f0ce24887537377 days 14 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xb56d39b5e5f14b1b2e7b4548006110d6125e75e915.664837088530414059 Ether
0xab7c620f9f8a6f5810a1a0cef11a226a45c3bba3baedc450c8e341f6e9b8f9ce4887506377 days 14 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xb56d39b5e5f14b1b2e7b4548006110d6125e75e932.419604505379696458 Ether
0x7cfcfe82b1ff6dc56dcbe793d168e943ae4d02a9f33e5add6647d228cd374bec4885363378 days 22 mins ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0.01 Ether
0x1a0490d679358dff60e47b3465a145403e78ec95fbb1e97e04a23b020b21c9884884931378 days 2 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xe9fe93e9532f0cd307f9a69913aedb5e92acaa153.333023228923659891 Ether
0x3b0e5a6d1903121f0efc36ff77d7eb4fb4d366af84c31d90ca30ebd05c1cd8aa4880971378 days 19 hrs ago0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0xf6b55acbbc49f4524aa48d19281a9a77c54de10f0.01154 Ether
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), EventStructWrongData (very low-severity), NestedArrayFunctionCallDecoder (medium-severity), ZeroFunctionSelector (very low-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: WolkExchange
Compiler Text: v0.4.17+commit.bdeb9e52
Optimization Enabled: Yes
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

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 ABI  
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uts":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"tokenGenerationMax","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"start_block","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"newOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_tokenAddress","type":"address"},{"name":"_amount","type":"uint256"}],"name":"transferAnyERC20Token","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"allSaleCompleted","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"wolkInc","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_isRunning","type":"bool"}],"name":"updatePurchasePossible","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newReserveRatio","type":"uint8"}],"name":"updateReserveRatio","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_participants","type":"address[]"}],"name":"removeParticipant","outputs":[{"name":"success","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_participant","type":"address"}],"name":"tokenGenerationEvent","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_tokenCreated","type":"uint256"}],"name":"WolkCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":false,"name":"_tokenDestroyed","type":"uint256"}],"name":"WolkDestroyed","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"LogRefund","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_prevOwner","type":"address"},{"indexed":false,"name":"_newOwner","type":"address"}],"name":"OwnerUpdate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}]

  Contract Creation Code Switch To Opcodes View
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