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Contract Overview | 0xbitcoin
Balance: 0 Ether
Ether Value: $0
Transactions: 189024 txns
Token Tracker: 0xBitcoin Token (0xBTC)
Misc:
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Contract Creator: 0x5294b9f7a71a97b703fa04ba3a415c8a136bdeb1at txn 0x5cdcd05f9d6e53e4be3c48095d95caa9d71f0c28f2bd5fe0ab4deeb20b75c026
Token Balance:
 Latest 25 transactions from a total of 189024 transactions
(+1 PendingTxn)

TxHash Age From To Value [TxFee]
0x1dc25af24d17c33967da8f8df36b5286a38988520bff9e35772db51015764a7a(pending)0x4601e619646e930f75c9c1e8acad64e804b35951  IN  0xb6ed7644c69416d67b522e20bc294a9a9b405b310 Ether(Pending)
0x2fa34a5038a519de7d0d34f4efe940bedec89ac17cd240ffea582b7ad6e301f056 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.000392322
0xa6ee4093843f7e727d4669a178979bf247db4a483f087e5bc134b93e98b8260c4 hrs ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.0003968916
0xdb06e7e3dc8357187ac42b3cd9cdcd05bfd4b78990ae7546b99c5dedaf0cf3904 hrs 2 mins agoHotbit  IN   0xbitcoin0 Ether0.00258965
0x5893adb874a7d55d0601346f679371c83c63eb0ea6093572a5851a3b6f6de3e25 hrs 9 mins ago0x1bad2a0d9762a3720f94445eb2e13d8aa51d1b0b  IN   0xbitcoin0 Ether0.000318136
0x1f31a790618e7f8a115f57642e1dc127c6ab446d82fb5ad823bdd851de5467155 hrs 23 mins ago0xededca3f905abb9271ffc0e2e84cf41e8993e73b  IN   0xbitcoin0 Ether0.000110379
0x3eed86bcd006ad97826607a2b36e54b5dae521158b0e8f78842fa303d1fb275d5 hrs 27 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.00065387
0x4cd0e5e7bcb4ce4f93159c688b8c83f2a7baa1e35704ac66b4f370d7fe752a895 hrs 54 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.0003925908
0x8ee0b3dde3c9146f7289b07197bc110739da16b1b87569e90fe2a6f2875141f55 hrs 58 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.0003971604
0x2f1dc26461dc7218140690a408d3b5356b096b721472f7c63aec19d1e903d67d7 hrs 27 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.000392322
0x4aa6c054ae7fa3af1aba0e5fe3fe4f3c815c1b6f8401b393a22d5bdfc1d7cb9b7 hrs 29 mins ago0xb63027a47526b139fd51c0754d3542d850879e43  IN   0xbitcoin0 Ether0.00017101656
0x5b03c8bf0296639755d027e5dc2e7517471d87cc2f7d20c5135890d166bde3a39 hrs 15 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.0003925908
0xdea1fc96de670c853f39294f636a8a1cc4d51743972b0be9467ea416676f1b1b9 hrs 15 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.0003971604
0x66261731734ef9898a6d808cfcf09722c35214332cca4996dd532271e42be3fe9 hrs 31 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.0003925908
0x3eca60df0cda413bcbaabecb3ff4810cb767c4e2d16853e0f4a8364e1b59686211 hrs 11 mins ago0x83bf4bc94355a9ccab9b87cb903059fd877e66ea  IN   0xbitcoin0 Ether0.000147172
0xb322d972c9264c727f72dcb7ad4832d229144449265e322c154d14355d558c6a11 hrs 13 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.00027481356
0x67eca29120146e9c8aca0b79ea51c4265b14c55e348921cfb5f8477a64305e9512 hrs 15 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.0003971604
0xcf536eba96f3e7c173d7822708906843ddde177e6f48dddde3e89538c60d3e6414 hrs 16 mins ago0x4601e619646e930f75c9c1e8acad64e804b35951  IN   0xbitcoin0 Ether0.0007333
0x53a75f424d1a7236c2d85e45ff034a47f4aa4d7cd31f078759472a4eea82718f17 hrs 57 mins ago0xfaf783785c882dc8930b5c00300ccda31638c299  IN   0xbitcoin0 Ether0.0000802406
0x89b2ce00a0aab2212d51d3b5836bf88725574da7c9c2cadbc516642b7f6dd62319 hrs 17 mins agoMercatox  IN   0xbitcoin0 Ether0.000771309
0x7b6b2803984d45484de0b4b197fcace1c6a90ca4116e1cce632d7d8aa121043020 hrs ago0x23f4a952f5281233840c13cfe6fa4677fc5fac03  IN   0xbitcoin0 Ether0.000147172
0xaccab0e59b4661fc32a2e83248a27702a3fab7b8a41cac4ddc86d6a90159271220 hrs 16 mins ago0x90501a884d91e75741625d129df767179931c7be  IN   0xbitcoin0 Ether0.001729271
0x29c44fd2df2b4a98c9247161d998071e20eb8eebbec444f78a3b1357155efc7823 hrs 7 mins ago0xa089e67099e938e1e178832e2a9b715d5e61c56a  IN   0xbitcoin0 Ether0.000065379
0xc0321c15cf4e64b3580f3a82e692a4990a7259355e5b1caa0b8e8c9aaeaa71af23 hrs 13 mins ago0x540d752a388b4fc1c9deeb1cd3716a2b7875d8a6  IN   0xbitcoin0 Ether0.000661934
0x909642dde721ae486669be34396ea6d7b14c94e4ec03693e6e7f44d5d75c024f23 hrs 23 mins ago0xa089e67099e938e1e178832e2a9b715d5e61c56a  IN   0xbitcoin0 Ether0.000206916
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 Internal Transactions as a result of Contract Execution
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0x4d03e3f9564f6f85d8df51048132d740192fecac051de6f2d22124babe1126d45745766164 days 9 hrs ago0x02b24b52a8df9540f8f47ff4a2137b8510916d250xb6ed7644c69416d67b522e20bc294a9a9b405b310.1 Ether
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Warning: The Compiled Contract might be susceptible to ExpExponentCleanup (medium/high-severity), EventStructWrongData (very low-severity), NestedArrayFunctionCallDecoder (medium-severity) SolidityCompiler Bugs.

Contract Source Code Verified (Exact Match)
Contract Name: _0xBitcoinToken
Compiler Text: v0.4.19+commit.c4cbbb05
Optimization Enabled: No
Runs (Optimiser):  200



  Contract Source Code   Find Similiar Contracts

pragma solidity ^0.4.18;


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

// '0xBitcoin Token' contract

// Mineable ERC20 Token using Proof Of Work

//

// Symbol      : 0xBTC

// Name        : 0xBitcoin Token

// Total supply: 21,000,000.00

// 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);


    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);

    }

}



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

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

// initial fixed supply

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

contract _0xBitcoinToken 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


    uint public _BLOCKS_PER_READJUSTMENT = 1024;


    //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**234;


    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;


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

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

    // Constructor

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

    function _0xBitcoinToken() public onlyOwner{



        symbol = "0xBTC";

        name = "0xBitcoin Token";

        decimals = 8;

        _totalSupply = 21000000 * 10**uint(decimals);

        if(locked) revert();
        locked = true;

        tokensMinted = 0;

        rewardEra = 0;
        maxSupplyForEra = _totalSupply.div(2);

        miningTarget = _MAXIMUM_TARGET;

        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();

            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

      //40 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 < 39)
      {
        rewardEra = rewardEra + 1;
      }

      //set the next minted supply at which the era will change
      // total supply is 2100000000000000  because of 8 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);






    }




    //https://en.bitcoin.it/wiki/Difficulty#What_is_the_formula_for_difficulty.3F
    //as of 2017 the bitcoin difficulty was up to 17 zeroes, it was only 8 in the early days

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


        uint ethBlocksSinceLastDifficultyPeriod = block.number - latestDifficultyPeriodStarted;
        //assume 360 ethereum blocks per hour

        //we want miners to spend 10 minutes to mine each 'block', about 60 ethereum blocks = one 0xbitcoin epoch
        uint epochsMined = _BLOCKS_PER_READJUSTMENT; //256

        uint targetEthBlocksPerDiffPeriod = epochsMined * 60; //should be 60 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;
   }



    //21m coins total
    //reward begins at 50 and is cut in half every reward era (as tokens are mined)
    function getMiningReward() public constant returns (uint) {
        //once we get half way thru the coins, only get 25 per block

         //every reward era, the reward amount halves.

         return (50 * 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

    //

    // 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;

        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);

        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);

    }

}

    Contract ABI  
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  Contract Creation Code Switch To Opcodes View
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   Swarm Source:
bzzr://79ea7788092334bc2b0b359348c4b28ecfb142fcac2535cf6b71951ed43dc386

 

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