Contract 0xB6eD7644C69416d67B522e20bC294A9a9B405B31 9

 
Txn Hash
Method
Block
From
To
Value
0x27935eb1dbd10cee6bbe0803930de8de8d498ce2ca2432c59c4971579f21c637Transfer(pending)2022-08-11 15:11:1223 mins ago0xa8d616e4c0ce6ee3fb7957db33abfb9d2d0dd3ac IN 0xBitcoin: 0xBTC Token0 Ether(Pending)(Pending)
0xa2c8bfa150825c59e04da8a4f178043b999ca8d83a62523dd8fd764119ce6158Transfer(pending)2022-08-11 13:00:412 hrs 34 mins ago0x1103bca81afab2de973ce9bc10a8423eca46e437 IN 0xBitcoin: 0xBTC Token0 Ether(Pending)(Pending)
0xd2fcc98499bb74583134776c4c980393fa8c49e3c3544403321fcfd116ea0a21Approve(pending)2022-08-11 12:34:533 hrs ago0xda59817820426c26d869c46d21204f20b3b8c39b IN 0xBitcoin: 0xBTC Token0 Ether(Pending)(Pending)
0xa636505d2e25e164442cc76772ef22c2f40f81c72ce2699f143d8d3f25bd4692Transfer(pending)2022-08-08 11:59:243 days 3 hrs ago0x9d50291ffa0b507d9e75663c88771b2b62792035 IN 0xBitcoin: 0xBTC Token0 Ether(Pending)(Pending)
0x8e05ffe848ba36780424647201120e642a3a8919c7a0ed1c567b2fd725ae59a5Approve(pending)2022-08-07 2:42:234 days 12 hrs ago0x5f1bc6fdce1d571d55a8b079e799429be05fbece IN 0xBitcoin: 0xBTC Token0 Ether(Pending)(Pending)
0x7f1b92cc4933dc6f64f0c59794382e6bb4579934201e1336a2efe38e1e439736Mint153213982022-08-11 15:04:5130 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00223843 24.‍29335075
0x630f122e7f1a5b8651e0145b44ea03eb83ab4e19384c7c387a0aae9b4c899b6bMint153213532022-08-11 14:55:2439 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00164494 17.‍85222942
0x6e2e291f6c292134701b2d6252616b64d6d16d6839f60249e4d84025c975915dMint153213522022-08-11 14:55:1040 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00165405 17.‍9534661
0xb20fd1e4c0bec1e231898bee80075c2c70f7b227c61a36a9b4d1014ff7f094c1Mint153213412022-08-11 14:53:3341 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00220756 23.‍96146512
0xfe94776e6e8da06b12eda7090fb08bcf29f2ee904b465830a9984eb7e4e190f1Mint153212982022-08-11 14:45:5649 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00308418 33.‍46769
0xf72c79890672b7fa7a5c2aeaf7e5f5e2d8aa3977c21a602b03980a191bd8d8f4Mint153212582022-08-11 14:37:0858 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00282534 30.‍6629949
0x49afacd6bea1aed49b20021c81410506379c4ce1f0422b107423e614900c63e4Mint153212432022-08-11 14:32:321 hr 2 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00305594 33.‍16996472
0x1643876e5e4d95ad9ad74082ebcef9281d65543e302ba7274b6d70313b59bb7aMint153212172022-08-11 14:26:401 hr 8 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00308209 33.‍44945
0x0f32661ce1b828f11c55b996dc830d9eff91f906ff303319166284993b1b9cb9Mint153209362022-08-11 13:16:492 hrs 18 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00308243 33.‍45313
0x115de9c0f92a359bf804c2109d5062bc4da0ee6189d954c88e1dac9921340ceeMint153207962022-08-11 12:45:512 hrs 49 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00272472 29.‍57094578
0xcf587680c4f932ad9e556ab867793a5ceb5b93ecbf45d0410105ee7ed2f65e2cMint153207562022-08-11 12:36:232 hrs 58 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍0026817 29.‍10403709
0xdd4e3601a3ccfc5f6a344412c29a260675c785b3abf38ff30a6907f241abd8aeMint153205972022-08-11 12:04:513 hrs 30 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00175313 19.‍02643321
0x7cdfe8d9a5d4d5aad19467b132a920314661353110844e63db443e1277165ccaMint153205692022-08-11 11:57:533 hrs 37 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00135029 14.‍65826493
0xd29cb881ab5749afb1bb8947f7f3d4443b9fc0b85e8a4c2bf231450d24818cb7Mint153204802022-08-11 11:36:273 hrs 58 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00197727 21.‍45903239
0x2f3b52068de04d10f5d7770cc19480968ff0807c90eefb7f71c318bfe925a65eMint153204652022-08-11 11:33:214 hrs 1 min ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍0020406 22.‍14913884
0xfd933b642a9facf8bc6ac2964dd04151606b2a66e6781b46591f58a9b4f5206bMint153204482022-08-11 11:28:574 hrs 6 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00130607 14.‍17460073
0x21d1ae2b7ff46322ef8277fe42fefe80da1c87db9df0ee1d2ab1972414d9dad3Mint153204092022-08-11 11:20:174 hrs 14 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00113561 12.‍3246655
0x48b36a4b40f8ac6f2008bf398314cadc14ae9cddb5d26fa890e1f9245447030cMint153203792022-08-11 11:13:274 hrs 21 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00122379 13.‍28330718
0x8a336a1ea1c4cba7f54032f9832e6660eab2ac30942ea0f16f4737145590eceaMint153203772022-08-11 11:13:134 hrs 21 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00141655 15.‍37967114
0x77376dc98821f57212e91e6e4cef6039290ea46dc021edb75972171fd9eda3e8Mint153203732022-08-11 11:11:424 hrs 23 mins ago0x7d3ebd2b56651d164fc36180050e9f6f7b890e9d IN  0xBitcoin: 0xBTC Token0 Ether0.‍00124552 13.‍51921779
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OVERVIEW

Pure mined digital currency for Ethereum.

Latest 1 internal transaction
Parent Txn Hash Block From To Value
0x4d03e3f9564f6f85d8df51048132d740192fecac051de6f2d22124babe1126d457457662018-06-07 4:19:041526 days 11 hrs ago 0x02b24b52a8df9540f8f47ff4a2137b8510916d25 0xBitcoin: 0xBTC Token0.‍1 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
_0xBitcoinToken

Compiler Version
v0.4.19+commit.c4cbbb05

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-02-06
*/

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 Security Audit

Contract ABI

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Swarm Source

bzzr://79ea7788092334bc2b0b359348c4b28ecfb142fcac2535cf6b71951ed43dc386
Block Transaction Difficulty Gas Used Reward
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.