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0xf44A964288Abbc3A2ee66ba714B2e53BBC571B1D
 

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0xD1d16425...6f96b4a8c
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
_0xCatetherToken

Compiler Version
v0.4.23+commit.124ca40d

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-04-29
*/

pragma solidity ^0.4.23;

// ----------------------------------------------------------------------------

// '0xCatether Token' contract

// Mineable ERC20 Token using Proof Of Work

//

// Symbol      : 0xCATE

// Name        : 0xCatether Token

// Total supply: No Limit

// Decimals    : 8

//


// ----------------------------------------------------------------------------



// ----------------------------------------------------------------------------

// Safe maths

// ----------------------------------------------------------------------------

library SafeMath {

    function add(uint a, uint b) internal pure returns (uint c) {

        c = a + b;

        require(c >= a);

    }

    function sub(uint a, uint b) internal pure returns (uint c) {

        require(b <= a);

        c = a - b;

    }

    function mul(uint a, uint b) internal pure returns (uint c) {

        c = a * b;

        require(a == 0 || c / a == b);

    }

    function div(uint a, uint b) internal pure returns (uint c) {

        require(b > 0);

        c = a / b;

    }

}



library ExtendedMath {


    //return the smaller of the two inputs (a or b)
    function limitLessThan(uint a, uint b) internal pure returns (uint c) {

        if(a > b) return b;

        return a;

    }
}

// ----------------------------------------------------------------------------

// ERC Token Standard #20 Interface

// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md

// ----------------------------------------------------------------------------

contract ERC20Interface {

    function totalSupply() public constant returns (uint);

    function balanceOf(address tokenOwner) public constant returns (uint balance);

    function allowance(address tokenOwner, address spender) public constant returns (uint remaining);

    function transfer(address to, uint tokens) public returns (bool success);

    function approve(address spender, uint tokens) public returns (bool success);

    function transferFrom(address from, address to, uint tokens) public returns (bool success);


    event Transfer(address indexed from, address indexed to, uint tokens);

    event Approval(address indexed tokenOwner, address indexed spender, uint tokens);

}



// ----------------------------------------------------------------------------

// Contract function to receive approval and execute function in one call

//

// Borrowed from MiniMeToken

// ----------------------------------------------------------------------------

contract ApproveAndCallFallBack {

    function receiveApproval(address from, uint256 tokens, address token, bytes data) public;

}



// ----------------------------------------------------------------------------

// Owned contract

// ----------------------------------------------------------------------------

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);

    }

}


// ----------------------------------------------------------------------------

// ERC20 Token, with the addition of symbol, name and decimals and an

// initial fixed supply

// ----------------------------------------------------------------------------

contract _0xCatetherToken is ERC20Interface, Owned {

    using SafeMath for uint;
    using ExtendedMath for uint;


    string public symbol;

    string public  name;

    uint8 public decimals;

    uint public _totalSupply;



    uint public latestDifficultyPeriodStarted;


    uint public epochCount;//number of 'blocks' mined

    //a little number
    uint public  _MINIMUM_TARGET = 2**16;


    //a big number is easier ; just find a solution that is smaller
    //uint public  _MAXIMUM_TARGET = 2**224;  bitcoin uses 224
    uint public  _MAXIMUM_TARGET = 2**224;


    uint public miningTarget;

    bytes32 public challengeNumber;   //generate a new one when a new reward is minted


    address public lastRewardTo;
    uint public lastRewardAmount;
    uint public lastRewardEthBlockNumber;

    // a bunch of maps to know where this is going (pun intended)
    
    mapping(bytes32 => bytes32) public solutionForChallenge;
    mapping(uint => uint) public timeStampForEpoch;
    mapping(uint => uint) public targetForEpoch;

    mapping(address => uint) balances;
    mapping(address => address) donationsTo;


    mapping(address => mapping(address => uint)) allowed;

    event Donation(address donation);
    event DonationAddressOf(address donator, address donnationAddress);
    event Mint(address indexed from, uint reward_amount, uint epochCount, bytes32 newChallengeNumber);

    // ------------------------------------------------------------------------

    // Constructor

    // ------------------------------------------------------------------------

    constructor() public{

        symbol = "0xCATE";

        name = "0xCatether Token";

        decimals = 8;
        epochCount = 0;
        _totalSupply = 0;

        miningTarget = _MAXIMUM_TARGET;
        challengeNumber = "GENESIS_BLOCK";
        solutionForChallenge[challengeNumber] = "Yes, this is the Genesis block.";

        latestDifficultyPeriodStarted = block.number;

        _startNewMiningEpoch();


        //The owner gets nothing! You must mine this ERC20 token
        //balances[owner] = _totalSupply;
        //Transfer(address(0), owner, _totalSupply);
    }




        function mint(uint256 nonce, bytes32 challenge_digest) public returns (bool success) {


            //the PoW must contain work that includes a recent ethereum block hash (challenge number) and the msg.sender's address to prevent MITM attacks
            bytes32 digest =  keccak256(challengeNumber, msg.sender, nonce );

            //the challenge digest must match the expected
            if (digest != challenge_digest) revert();

            //the digest must be smaller than the target
            if(uint256(digest) > miningTarget) revert();


            //only allow one reward for each challenge
             bytes32 solution = solutionForChallenge[challengeNumber];
             solutionForChallenge[challengeNumber] = digest;
             if(solution != 0x0) revert();  //prevent the same answer from awarding twice


            uint reward_amount = getMiningReward(digest);

            balances[msg.sender] = balances[msg.sender].add(reward_amount);

            _totalSupply = _totalSupply.add(reward_amount);

            //set readonly diagnostics data
            lastRewardTo = msg.sender;
            lastRewardAmount = reward_amount;
            lastRewardEthBlockNumber = block.number;

             _startNewMiningEpoch();

              emit Mint(msg.sender, reward_amount, epochCount, challengeNumber );

           return true;

        }


    //a new 'block' to be mined
    function _startNewMiningEpoch() internal {
        
        targetForEpoch[epochCount] = miningTarget;
        timeStampForEpoch[epochCount] = block.timestamp;
        epochCount = epochCount.add(1);
    
      //Difficulty adjustment following the DigiChieldv3 implementation (Tempered-SMA)
      // Allows more thorough protection against multi-pool hash attacks
      // https://github.com/zawy12/difficulty-algorithms/issues/9
        _reAdjustDifficulty();


      //make the latest ethereum block hash a part of the next challenge for PoW to prevent pre-mining future blocks
      //do this last since this is a protection mechanism in the mint() function
      challengeNumber = blockhash(block.number - 1);

    }




    //https://github.com/zawy12/difficulty-algorithms/issues/9
    //readjust the target via a tempered SMA
    function _reAdjustDifficulty() internal {
        
        //we want miners to spend 1 minutes to mine each 'block'
        //for that, we need to approximate as closely as possible the current difficulty, by averaging the 28 last difficulties,
        // compared to the average time it took to mine each block.
        // also, since we can't really do that if we don't even have 28 mined blocks, difficulty will not move until we reach that number.
        
        uint timeTarget = 188; // roughly equals to Pi number. (There's also Phi somewhere below)
        
        if(epochCount>28) {
            // counter, difficulty-sum, solve-time-sum, solve-time
            uint i = 0;
            uint sumD = 0;
            uint sumST = 0;  // the first calculation of the timestamp difference can be negative, but it's not that bad (see below)
            uint solvetime;
            
            for(i=epochCount.sub(28); i<epochCount; i++){
                sumD = sumD.add(targetForEpoch[i]);
                solvetime = timeStampForEpoch[i] - timeStampForEpoch[i-1];
                if (solvetime > timeTarget.mul(7)) {solvetime = timeTarget.mul(7); }
                //if (solvetime < timeTarget.mul(-6)) {solvetime = timeTarget.mul(-6); }    Ethereum EVM doesn't allow for a timestamp that make time go "backwards" anyway, so, we're good
                sumST += solvetime;                                                   //    (block.timestamp is an uint256 => negative = very very long time, thus rejected by the network)
                // we don't use safeAdd because in sore rare cases, it can underflow. However, the EVM structure WILL make it overflow right after, thus giving a correct SumST after a few loops
            }
            sumST = sumST.mul(10000).div(2523).add(1260); // 1260 seconds is a 75% weighing on what should be the actual time to mine 28 blocks.
            miningTarget = sumD.mul(60).div(sumST); //We add it to the actual time it took with a weighted average (tempering)
        }
        
        latestDifficultyPeriodStarted = block.number;

        if(miningTarget < _MINIMUM_TARGET) //very difficult
        {
          miningTarget = _MINIMUM_TARGET;
        }

        if(miningTarget > _MAXIMUM_TARGET) //very easy
        {
          miningTarget = _MAXIMUM_TARGET;
        }
        targetForEpoch[epochCount] = miningTarget;
    }


    //this is a recent ethereum block hash, used to prevent pre-mining future blocks
    function getChallengeNumber() public constant returns (bytes32) {
        return challengeNumber;
    }

    //the number of zeroes the digest of the PoW solution requires.  Auto adjusts
     function getMiningDifficulty() public constant returns (uint) {
        return _MAXIMUM_TARGET.div(miningTarget);
    }

    function getMiningTarget() public constant returns (uint) {
       return miningTarget;
   }



    //There's no limit to the coin supply
    //reward follows the same emmission rate as Dogecoins'
    function getMiningReward(bytes32 digest) public constant returns (uint) {
        
        if(epochCount > 600000) return (30000 * 10**uint(decimals) );
        if(epochCount > 500000) return (46875 * 10**uint(decimals) );
        if(epochCount > 400000) return (93750 * 10**uint(decimals) );
        if(epochCount > 300000) return (187500 * 10**uint(decimals) );
        if(epochCount > 200000) return (375000 * 10**uint(decimals) );
        if(epochCount > 145000) return (500000 * 10**uint(decimals) );
        if(epochCount > 100000) return ((uint256(keccak256(digest, blockhash(block.number - 2))) % 1500000) * 10**uint(decimals) );
        return ( (uint256(keccak256(digest, blockhash(block.number - 2))) % 3000000) * 10**uint(decimals) );

    }

    //help debug mining software (even though challenge_digest isn't used, this function is constant and helps troubleshooting mining issues)
    function getMintDigest(uint256 nonce, bytes32 challenge_digest, bytes32 challenge_number) public view returns (bytes32 digesttest) {

        bytes32 digest = keccak256(challenge_number,msg.sender,nonce);

        return digest;

      }

        //help debug mining software
      function checkMintSolution(uint256 nonce, bytes32 challenge_digest, bytes32 challenge_number, uint testTarget) public view returns (bool success) {

          bytes32 digest = keccak256(challenge_number,msg.sender,nonce);

          if(uint256(digest) > testTarget) revert();

          return (digest == challenge_digest);

        }



    // ------------------------------------------------------------------------

    // Total supply

    // ------------------------------------------------------------------------

    function totalSupply() public constant returns (uint) {

        return _totalSupply  - balances[address(0)];

    }



    // ------------------------------------------------------------------------

    // Get the token balance for account `tokenOwner`

    // ------------------------------------------------------------------------

    function balanceOf(address tokenOwner) public constant returns (uint balance) {

        return balances[tokenOwner];

    }
    
    function donationTo(address tokenOwner) public constant returns (address donationAddress) {

        return donationsTo[tokenOwner];

    }
    
    function changeDonation(address donationAddress) public returns (bool success) {

        donationsTo[msg.sender] = donationAddress;
        
        emit DonationAddressOf(msg.sender , donationAddress); 
        return true;
    
    }



    // ------------------------------------------------------------------------

    // Transfer the balance from token owner's account to `to` account

    // - Owner's account must have sufficient balance to transfer

    // - 0 value transfers are allowed

    // ------------------------------------------------------------------------

    function transfer(address to, uint tokens) public returns (bool success) {
        
        address donation = donationsTo[msg.sender];
        balances[msg.sender] = balances[msg.sender].sub(tokens);
        
        balances[to] = balances[to].add(tokens);
        balances[donation] = balances[donation].add(161803400);
        
        emit Transfer(msg.sender, to, tokens);
        emit Donation(donation);
        
        return true;

    }
    
    function transferAndDonateTo(address to, uint tokens, address donation) public returns (bool success) {
        
        balances[msg.sender] = balances[msg.sender].sub(tokens);

        balances[to] = balances[to].add(tokens);
        balances[donation] = balances[donation].add(161803400);

        emit Transfer(msg.sender, to, tokens);
        emit Donation(donation);

        return true;

    }



    // ------------------------------------------------------------------------

    // Token owner can approve for `spender` to transferFrom(...) `tokens`

    // from the token owner's account

    //

    // https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md

    // recommends that there are no checks for the approval double-spend attack

    // as this should be implemented in user interfaces

    // ------------------------------------------------------------------------

    function approve(address spender, uint tokens) public returns (bool success) {

        allowed[msg.sender][spender] = tokens;

        emit Approval(msg.sender, spender, tokens);

        return true;

    }



    // ------------------------------------------------------------------------

    // Transfer `tokens` from the `from` account to the `to` account

    //

    // The calling account must already have sufficient tokens approve(...)-d

    // for spending from the `from` account and

    // - From account must have sufficient balance to transfer

    // - Spender must have sufficient allowance to transfer

    // - 0 value transfers are allowed

    // ------------------------------------------------------------------------

    function transferFrom(address from, address to, uint tokens) public returns (bool success) {
        
        address donation = donationsTo[from];
        balances[from] = balances[from].sub(tokens);

        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);

        balances[to] = balances[to].add(tokens);
        balances[donation] = balances[donation].add(161803400);

        emit Transfer(from, to, tokens);
        emit Donation(donation);

        return true;

    }



    // ------------------------------------------------------------------------

    // Returns the amount of tokens approved by the owner that can be

    // transferred to the spender's account

    // ------------------------------------------------------------------------

    function allowance(address tokenOwner, address spender) public constant returns (uint remaining) {

        return allowed[tokenOwner][spender];

    }



    // ------------------------------------------------------------------------

    // Token owner can approve for `spender` to transferFrom(...) `tokens`

    // from the token owner's account. The `spender` contract function

    // `receiveApproval(...)` is then executed

    // ------------------------------------------------------------------------

    function approveAndCall(address spender, uint tokens, bytes data) public returns (bool success) {

        allowed[msg.sender][spender] = tokens;

        emit Approval(msg.sender, spender, tokens);

        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);

        return true;

    }



    // ------------------------------------------------------------------------

    // Don't accept ETH

    // ------------------------------------------------------------------------

    function () public payable {

        revert();

    }



    // ------------------------------------------------------------------------

    // Owner can transfer out any accidentally sent ERC20 tokens

    // ------------------------------------------------------------------------

    function transferAnyERC20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {

        return ERC20Interface(tokenAddress).transfer(owner, tokens);

    }

}

Contract Security Audit

Contract ABI

API
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Swarm Source

bzzr://280b747106e059c8d9bd2f7f6a80a538b68856eee772ea8a464dd7a42c76ad1b

Block Uncle Number Difficulty Gas Used Reward
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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.