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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 ApproveAndCallFallBack    - function receiveApproval(address from ...  contract Owned    - function Owned()    - function transferOwnership(address _n ...    - function acceptOwnership()  contract ERC918Interface    - function mint(uint256 nonce, bytes32 ...    - function getChallengeNumber()    - function getMiningDifficulty()    - function getMiningTarget()    - function getMiningReward()  contract _0xGoldToken is ERC20Inte ... *    - function _0xGoldToken()    - function mint(uint256 nonce, bytes32 ...    - function _startNewMiningEpoch()    - function _reAdjustDifficulty()    - function getChallengeNumber()    - function getMiningDifficulty()    - function getMiningTarget()    - function getMiningReward()    - function getMintDigest(uint256 nonce, ...    - function checkMintSolution(uint256 no ...    - function totalSupply()    - function balanceOf(address tokenOwner ...    - function transfer(address to, uint to ...    - function approve(address spender, uin ...    - function transferFrom(address from, a ...    - function allowance(address tokenOwner ...    - function approveAndCall(address spend ...    - function ()    - function transferAnyERC20Token(addres ...    - function merge()

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/**
 *Submitted for verification at Etherscan.io on 2018-08-09
*/

pragma solidity ^0.4.18;

// ----------------------------------------------------------------------------
//
//  Symbol       : 0xGOLD
//  Name         : 0xGold Token
//  Total supply : 5000000 (5 million)
//  Decimals     : 10
//
// ----------------------------------------------------------------------------
// 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-20 Token Interface
// ----------------------------------------------------------------------------

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

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);

    function Owned() 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);
        OwnershipTransferred(owner, newOwner);
        owner = newOwner;
        newOwner = address(0);
    }
}

contract ERC918Interface  {

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

    function getChallengeNumber() public constant returns (bytes32);

    function getMiningDifficulty() public constant returns (uint);

    function getMiningTarget() public constant returns (uint);

    function getMiningReward() public constant returns (uint);

    event Mint(address indexed from, uint reward_amount, uint epochCount, bytes32 newChallengeNumber);

    address public lastRewardTo;
    uint public lastRewardAmount;
    uint public lastRewardEthBlockNumber;
    bytes32 public challengeNumber;


}

// ----------------------------------------------------------------------------
// ERC-20 Token
// ----------------------------------------------------------------------------

contract _0xGoldToken is ERC20Interface, Owned, ERC918Interface {

    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
    uint public _BLOCKS_PER_READJUSTMENT = 100;

    //a little number and a big number
    uint public  _MINIMUM_TARGET = 2**16;
    uint public  _MAXIMUM_TARGET = 2**234;
    
    address public parentAddress;     // for merge mining

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

    uint public rewardEra;
    uint public maxSupplyForEra;

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

    bool locked = false;

    mapping(bytes32 => bytes32) solutionForChallenge;

    uint public tokensMinted;

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

    // ------------------------------------------------------------------------
    // Constructor
    // ------------------------------------------------------------------------
    function _0xGoldToken() public onlyOwner{

        symbol = "0xGOLD";
        name = "0xGold Token";
        decimals = 10;
        _totalSupply = 5000000 * 10**uint(decimals);

        if(locked) revert();

        locked = true;
        tokensMinted = 500000000000000; // 50,000
        rewardEra = 0;
        maxSupplyForEra = _totalSupply.div(2);
        miningTarget = _MAXIMUM_TARGET;
        latestDifficultyPeriodStarted = block.number;

        _startNewMiningEpoch();
        
        parentAddress = 0xB6eD7644C69416d67B522e20bC294A9a9B405B31; // for merge mining
        
        balances[owner] = tokensMinted;
        Transfer(address(0), owner, tokensMinted);


    }

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

      //Cannot mint more tokens than there are
      assert(tokensMinted <= maxSupplyForEra);

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

      _startNewMiningEpoch();

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

      return true;

    }

    //a new 'block' to be mined
    function _startNewMiningEpoch() internal {

      //if max supply for the era will be exceeded next reward round then enter the new era before that happens

      //2 is the final reward era, almost all tokens minted
      //once the final era is reached, more tokens will not be given out because the assert function
      if( tokensMinted.add(getMiningReward()) > maxSupplyForEra && rewardEra < 2)
      {
        rewardEra = rewardEra + 1;
      }

      //set the next minted supply at which the era will change
      // total supply is 50000000000000000  because of 10 decimal places
      maxSupplyForEra = _totalSupply - _totalSupply.div( 2**(rewardEra + 1));

      epochCount = epochCount.add(1);

      //every so often, readjust difficulty. Dont readjust when deploying
      if(epochCount % _BLOCKS_PER_READJUSTMENT == 0)
      {
        _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 = block.blockhash(block.number - 1);

    }

    //readjust the target by 5 percent
    function _reAdjustDifficulty() internal {

        uint ethBlocksSinceLastDifficultyPeriod = block.number - latestDifficultyPeriodStarted;
        //assume 240 ethereum blocks per hour

        //we want miners to spend 7 minutes to mine each 'block', about 28 ethereum blocks = one 0xGOLD epoch
        uint epochsMined = _BLOCKS_PER_READJUSTMENT; //256

        uint targetEthBlocksPerDiffPeriod = epochsMined * 28; //should be 28 times slower than ethereum

        //if there were less eth blocks passed in time than expected
        if( ethBlocksSinceLastDifficultyPeriod < targetEthBlocksPerDiffPeriod )
        {
          uint excess_block_pct = (targetEthBlocksPerDiffPeriod.mul(100)).div( ethBlocksSinceLastDifficultyPeriod );

          uint excess_block_pct_extra = excess_block_pct.sub(100).limitLessThan(1000);
          // If there were 5% more blocks mined than expected then this is 5.  If there were 100% more blocks mined than expected then this is 100.

          //make it harder
          miningTarget = miningTarget.sub(miningTarget.div(2000).mul(excess_block_pct_extra));   //by up to 50 %
        }else{
          uint shortage_block_pct = (ethBlocksSinceLastDifficultyPeriod.mul(100)).div( targetEthBlocksPerDiffPeriod );
          uint shortage_block_pct_extra = shortage_block_pct.sub(100).limitLessThan(1000); //always between 0 and 1000

          //make it easier
          miningTarget = miningTarget.add(miningTarget.div(2000).mul(shortage_block_pct_extra));   //by up to 50 %
        }

        latestDifficultyPeriodStarted = block.number;

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

        if(miningTarget > _MAXIMUM_TARGET) //very easy
        {
          miningTarget = _MAXIMUM_TARGET;
        }
    }


    //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;
   }

    //reward is cut in half every reward era (as tokens are mined)
    function getMiningReward() public constant returns (uint) {
         //every reward era, the reward amount halves.
         return (16 * 10**uint(decimals) ).div( 2**rewardEra ) ;
    }

    //help debug mining software
    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];
    }

    // ------------------------------------------------------------------------
    // 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) {
        balances[msg.sender] = balances[msg.sender].sub(tokens);
        balances[to] = balances[to].add(tokens);
        Transfer(msg.sender, to, tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Token owner can approve for `spender` to transferFrom(...) `tokens`
    // from the token owner's account
    // ------------------------------------------------------------------------
    function approve(address spender, uint tokens) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;
        Approval(msg.sender, spender, tokens);
        return true;
    }

    // ------------------------------------------------------------------------
    // Transfer `tokens` from the `from` account to the `to` account
    // ------------------------------------------------------------------------
    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);
        Transfer(from, to, tokens);
        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;
        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);
    }
    
    // ------------------------------------------------------------------------
    // Merge Mining
    // ------------------------------------------------------------------------
    
    function merge() public returns (bool success) {

            bytes32 future_challengeNumber = block.blockhash(block.number - 1);
            if(challengeNumber == future_challengeNumber){
                return false; // ( this is likely the second time that mergeMint() has been called in a transaction, so return false (don't revert))
            }

            //verify Parent::lastRewardTo == msg.sender;
            if(ERC918Interface(parentAddress).lastRewardTo() != msg.sender){
                return false; // a different address called mint last so return false ( don't revert)
            }
            
            //verify Parent::lastRewardEthBlockNumber == block.number;

            if(ERC918Interface(parentAddress).lastRewardEthBlockNumber() != block.number){
                return false; // parent::mint() was called in a different block number so return false ( don't revert)
            }


             bytes32 parentChallengeNumber = ERC918Interface(parentAddress).challengeNumber();
             bytes32 solution = solutionForChallenge[parentChallengeNumber];
             if(solution != 0x0) return false;  //prevent the same answer from awarding twice
             bytes32 digest = 'merge';
             solutionForChallenge[parentChallengeNumber] = digest;


            //so now we may safely run the relevant logic to give an award to the sender, and update the contract
            
                       uint reward_amount = getMiningReward();

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

            tokensMinted = tokensMinted.add(reward_amount);


            //Cannot mint more tokens than there are
            assert(tokensMinted <= maxSupplyForEra);

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


             _startNewMiningEpoch();

              Mint(msg.sender, reward_amount, epochCount, 0 ); // use 0 to indicate a merge mine

           return true;

        }


}

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