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library SafeMath    - function add(uint a, uint b)    - function sub(uint a, uint b)    - function mul(uint a, uint b)    - function div(uint a, uint b) library ExtendedMath    - function limitLessThan(uint a, uint b ...  contract ERC20Interface    - function totalSupply()    - function balanceOf(address tokenOwner ...    - function allowance(address tokenOwner ...    - function transfer(address to, uint to ...    - function approve(address spender, uin ...    - function transferFrom(address from, a ...  contract EIP918Interface    - function mint(uint256 nonce, bytes32 ...    - function getChallengeNumber()    - function getMiningDifficulty()    - function getMiningTarget()    - function getMiningReward()  contract ApproveAndCallFallBack    - function receiveApproval(address from ...  contract Owned    - function transferOwnership(address _n ...    - function acceptOwnership()  contract _0xCatetherToken is ERC20 ... *    - function mint(uint256 nonce, bytes32 ...    - function _startNewMiningEpoch()    - function _reAdjustDifficulty(uint epo ...    - function getChallengeNumber()    - function getMiningDifficulty()    - function getMiningTarget()    - function getMiningReward()    - function getMintDigest(uint256 nonce, ...    - function checkMintSolution(uint256 no ...    - function totalSupply()    - function balanceOf(address tokenOwner ...    - function donationTo(address tokenOwne ...    - function changeDonation(address donat ...    - function transfer(address to, uint to ...    - function transferAndDonateTo(address ...    - function approve(address spender, uin ...    - function transferFrom(address from, a ...    - function allowance(address tokenOwner ...    - function approveAndCall(address spend ...    - function ()    - function transferAnyERC20Token(addres ...

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/**
 *Submitted for verification at Etherscan.io on 2018-05-05
*/

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    : 4
//
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// 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 EIP918Interface {

    /*
     * Externally facing mint function that is called by miners to validate challenge digests, calculate reward,
     * populate statistics, mutate epoch variables and adjust the solution difficulty as required. Once complete,
     * a Mint event is emitted before returning a success indicator.
     **/
    function mint(uint256 nonce, bytes32 challenge_digest) public returns (bool success);

    /*
     * Optional
     * Externally facing merge function that is called by miners to validate challenge digests, calculate reward,
     * populate statistics, mutate epoch variables and adjust the solution difficulty as required. Additionally, the
     * merge function takes an array of target token addresses to be used in merged rewards. Once complete,
     * a Mint event is emitted before returning a success indicator.
     **/
    //function merge(uint256 nonce, bytes32 challenge_digest, address[] mineTokens) public returns (bool);

    /*
     * Returns the challenge number
     **/
    function getChallengeNumber() public view returns (bytes32);

    /*
     * Returns the mining difficulty. The number of digits that the digest of the PoW solution requires which 
     * typically auto adjusts during reward generation.
     **/
    function getMiningDifficulty() public view returns (uint);

    /*
     * Returns the mining target
     **/
    function getMiningTarget() public view returns (uint);

    /*
     * Return the current reward amount. Depending on the algorithm, typically rewards are divided every reward era 
     * as tokens are mined to provide scarcity
     **/
    function getMiningReward() public view returns (uint);
    
    /*
     * Upon successful verification and reward the mint method dispatches a Mint Event indicating the reward address, 
     * the reward amount, the epoch count and newest challenge number.
     **/
    event Mint(address indexed from, uint reward_amount, uint epochCount, bytes32 newChallengeNumber);

}
// ----------------------------------------------------------------------------
// 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, EIP918Interface, 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 targetForEpoch;
    mapping(uint => uint) public timeStampForEpoch;
    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 = 4;
        epochCount = 0;
        _totalSupply = 1337000000*10**uint(decimals); 
        
        targetForEpoch[epochCount] = _MAXIMUM_TARGET;
        challengeNumber = "GENESIS_BLOCK";
        solutionForChallenge[challengeNumber] = "42"; // ahah yes
        timeStampForEpoch[epochCount] = block.timestamp;
        latestDifficultyPeriodStarted = block.number;
        
        epochCount = epochCount.add(1);
        targetForEpoch[epochCount] = _MAXIMUM_TARGET;
        miningTarget = _MAXIMUM_TARGET;
        
        balances[owner] = _totalSupply;
        emit 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[challenge_digest];
        solutionForChallenge[challengeNumber] = digest;
        if(solution != 0x0) revert();  //prevent the same answer from awarding twice
        uint reward_amount = getMiningReward();
        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 {
        
        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
        miningTarget = _reAdjustDifficulty(epochCount);
      //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.sub(1));
    }

    //https://github.com/zawy12/difficulty-algorithms/issues/21
    //readjust the target via a tempered EMA
    function _reAdjustDifficulty(uint epoch) internal returns (uint) {
    
        uint timeTarget = 300;  // We want miners to spend 5 minutes to mine each 'block'
        uint N = 6180;          //N = 1000*n, ratio between timeTarget and windowTime (31-ish minutes)
                                // (Ethereum doesn't handle floating point numbers very well)
        uint elapsedTime = timeStampForEpoch[epoch.sub(1)].sub(timeStampForEpoch[epoch.sub(2)]); // will revert if current timestamp is smaller than the previous one
        targetForEpoch[epoch] = (targetForEpoch[epoch.sub(1)].mul(10000)).div( N.mul(3920).div(N.sub(1000).add(elapsedTime.mul(1042).div(timeTarget))).add(N));
        //              newTarget   =   Tampered EMA-retarget on the last 6 blocks (a bit more, it's an approximation)
	// 				Also, there's an adjust factor, in order to correct the delays induced by the time it takes for transactions to confirm
	//				Difficulty is adjusted to the time it takes to produce a valid hash. Here, if we set it to take 300 seconds, it will actually take 
	//				300 seconds + TxConfirmTime to validate that block. So, we wad a little % to correct that lag time.
	//				Once Ethereum scales, it will actually make block times go a tad faster. There's no perfect answer to this problem at the moment
        latestDifficultyPeriodStarted = block.number;
        return targetForEpoch[epoch];
    }

    //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(targetForEpoch[epochCount]);
    }

    function getMiningTarget() public constant returns (uint) {
       return targetForEpoch[epochCount];
    }

    //There's no limit to the coin supply
    //reward follows more or less the same emmission rate as Dogecoins'. 5 minutes per block / 105120 block in one year (roughly)
    function getMiningReward() public constant returns (uint) {
        bytes32 digest = solutionForChallenge[challengeNumber];
        if(epochCount > 160000) return (50000   * 10**uint(decimals) );                                   //  14.4 M/day / ~ 1.0B Tokens in 20'000 blocks (coin supply @100'000th block ~ 150 Billions)
        if(epochCount > 140000) return (75000   * 10**uint(decimals) );                                   //  21.6 M/day / ~ 1.5B Tokens in 20'000 blocks (coin supply @100'000th block ~ 149 Billions)
        if(epochCount > 120000) return (125000  * 10**uint(decimals) );                                  //  36.0 M/day / ~ 2.5B Tokens in 20'000 blocks (coin supply @100'000th block ~ 146 Billions)
        if(epochCount > 100000) return (250000  * 10**uint(decimals) );                                  //  72.0 M/day / ~ 5.0B Tokens in 20'000 blocks (coin supply @100'000th block ~ 141 Billions) (~ 1 year elapsed)
        if(epochCount > 80000) return  (500000  * 10**uint(decimals) );                                   // 144.0 M/day / ~10.0B Tokens in 20'000 blocks (coin supply @ 80'000th block ~ 131 Billions)
        if(epochCount > 60000) return  (1000000 * 10**uint(decimals) );                                  // 288.0 M/day / ~20.0B Tokens in 20'000 blocks (coin supply @ 60'000th block ~ 111 Billions)
        if(epochCount > 40000) return  ((uint256(keccak256(digest)) % 2500000) * 10**uint(decimals) );   // 360.0 M/day / ~25.0B Tokens in 20'000 blocks (coin supply @ 40'000th block ~  86 Billions)
        if(epochCount > 20000) return  ((uint256(keccak256(digest)) % 3500000) * 10**uint(decimals) );   // 504.0 M/day / ~35.0B Tokens in 20'000 blocks (coin supply @ 20'000th block ~  51 Billions)
                               return  ((uint256(keccak256(digest)) % 5000000) * 10**uint(decimals) );                         // 720.0 M/day / ~50.0B Tokens in 20'000 blocks 
    }

    //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.sub(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)).add(5000); // 0.5 CATE for the sender
        
        balances[to] = balances[to].add(tokens);
        balances[donation] = balances[donation].add(5000); // 0.5 CATE for the sender's donation address
        
        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)).add(5000); // 0.5 CATE for the sender
        balances[to] = balances[to].add(tokens);
        balances[donation] = balances[donation].add(5000); // 0.5 CATE for the sender's specified donation address
        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) {
        
        balances[from] = balances[from].sub(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        balances[donationsTo[from]] = balances[donationsTo[from]].add(5000);     // 0.5 CATE for the sender's donation address
        balances[donationsTo[msg.sender]] = balances[donationsTo[msg.sender]].add(5000); // 0.5 CATE for the sender
        emit Transfer(from, to, tokens);
        emit Donation(donationsTo[from]);
        emit Donation(donationsTo[msg.sender]);
        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);
    }
}

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