Contract 0xe7cb24f449973d5b3520e5b93d88b405903c75fb 4

 
 
Txn Hash Method
Block
From
To
Value [Txn Fee]
0x82a107e2daf5324ce1a3462527f2080ba8857416347c2e55c55b41fcb81223b2Mint112442512021-09-26 6:58:335 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0x47b597569e40c76901826a8b4a53260626db598b5d708509655a0039928443d2Mint112441932021-09-26 6:55:398 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046616
0x622de56da8c6cf3be4d654845fb536f3f6a5cab86abe660ed8eec9dae193904eMint112441792021-09-26 6:54:578 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00048716
0x357cd231f28d44d5375fbb8ea5e0f281258231d63a125d3138c10fa2685cf3f3Mint112440642021-09-26 6:49:1214 mins ago0x1ae8537afe4e8fc9fde383f955c0200e8c16e707 IN  BNbitcoin: BNBTC Token0 BNB0.00046508
0x5487d46dc9738171e81dd2f9e059c45066bbf07a5e7b7e84d9b457540971f1e1Mint112440182021-09-26 6:46:5417 mins ago0x1ae8537afe4e8fc9fde383f955c0200e8c16e707 IN  BNbitcoin: BNBTC Token0 BNB0.00048602
0x4192377fb9e07b89a3fd388c8126c4f91c964a3231349dda956a045e00a8dbc8Mint112439682021-09-26 6:44:2419 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0xa80af3d8c7b4c3ba3065858b28ac16ace9c1e7115b2c416abca18cff3f1d739bMint112439192021-09-26 6:41:5721 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046616
0xc86d3c7a823076dae3256045525cbc9d7aa9578ad2b104e96e2a8e775d9dc6ecMint112436382021-09-26 6:27:5436 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0x658a9f95ea9c5593a971b8e7c9f8a8d37d28025404ef9ff23b259208564a151fMint112435932021-09-26 6:25:3938 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046616
0x7f9b0fc9fba09f89b450a760079b033aeda5a7ccdce136e3aa1597f5f1c5f1bbMint112435412021-09-26 6:23:0340 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046604
0x26b016a0d21a055e73325e4ab1f087f9cc777b31bf5ba6e33ba23a0e96f81c66Mint112435282021-09-26 6:22:2441 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0x49986c4fb0d35a4dab7128c7c7a10f02c48f7eb9bd814dcd30a9c7bc0a690dfdMint112434342021-09-26 6:17:4246 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0x08eb704ebd691c445041f44392c05afba6f97d0e8ae00b584d8d2cc2654b2f7dMint112433132021-09-26 6:11:3952 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0x02dbe1871cc956d4615049185b898b44580fd4ef5a11868cca8d4e78ac56e6c1Mint112431642021-09-26 6:04:1259 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046604
0xdf03f7f62901cb05173fdd2a4ed5731d73b38c991a28a05a25cf38805b621ad4Mint112431222021-09-26 6:01:591 hr 1 min ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046616
0x440d75945769ed9676f12bfcea9e19874b629e0cef8c5e597cea1905211a442fMint112430472021-09-26 5:58:131 hr 5 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004871
0xe6ea14d1bf7a6135bd4274b58643671a27bd030a9a504d84b24c0ed1b698f266Mint112429032021-09-26 5:50:551 hr 13 mins ago0x1ae8537afe4e8fc9fde383f955c0200e8c16e707 IN  BNbitcoin: BNBTC Token0 BNB0.00048596
0xd976d5458d15bb5d91b56fd446068dbe56f383bd6c9a5f4877104576046b738aMint112428962021-09-26 5:50:341 hr 13 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0005411
0xcf86010e84e802b4133eddada32a6d23406ee68e3d21555399531b709b96e2c8Mint112424452021-09-26 5:27:121 hr 36 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046604
0x004eafd0b6c6d52ee6c8af964089e945f4a93fe51a09aef26e490ac77d505b85Mint112424122021-09-26 5:25:331 hr 38 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0xda21af2e8dae6f533afa4a32cd18c5a69b2d4a5c6f33227b1547af72c4b83d80Mint112423072021-09-26 5:20:181 hr 43 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046616
0x591df5e911c799e777e2c0fc510e2c3566e1ce590ae5887670d9ba1c3e5a1b5aMint112422572021-09-26 5:17:481 hr 46 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046604
0x9f647332c36ad136cc98aecf8fa9c1f4d1ef09c217a2c9ba153f60785f776591Mint112420452021-09-26 5:07:121 hr 56 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.0004661
0xaa066b2bbe8198ecc52422d751a634dd452dd3cb67599e2fbc42720152619b18Mint112418792021-09-26 4:58:542 hrs 5 mins ago0x317fb90eca7afa88029a802258823e294c3a9ab4 IN  BNbitcoin: BNBTC Token0 BNB0.00046604
0xc90e7b02786fc61e242014eea5ca0e91d21c3bee706ea0fee8441e2cd44760d5Approve112418772021-09-26 4:58:482 hrs 5 mins ago0xcbb3cd08a09d7363f874c823c3bd87f22d662cdd IN  BNbitcoin: BNBTC Token0 BNB0.000309848
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OVERVIEW

BNbitcoin (BNBTC) is the first pure mined Proof-of-Work token on the Binance Smart Chain network.

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Contract Source Code Verified (Exact Match)

Contract Name:
_BNbitcoinToken

Compiler Version
v0.4.19+commit.c4cbbb05

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at BscScan.com on 2021-03-12
*/

pragma solidity ^0.4.18;

// ----------------------------------------------------------------------------
//
// 'Native bitcoin on Binance Smart Chain' - BNBTC
//
// Mineable bitcoin token using Proof of Work
//
// An adaptation of 0xBTC token from the Ethereum mainnet 
// to be compliant with the Binance Smart Chain. 
// Motivation: after the DeFi-related increase of gas costs on the Ethereum
// mainnet, an alternative for miners is needed.
// BNBTC embodies such alternative and it restores the original Satoshi 
// Nakamoto's project settings for the difficulty adjustment period (2 weeks)
// and max target.
// 
//
// Symbol       : BNBTC
//
// Name         : BNbitcoin Token - minable bitcoin on BSC
//
// Total supply : 21,000,000.00
//
// Decimals     : 8
//
//
//
// This code is licensed MIT.
//
// The original source code (see 0xbitcoin.foundation) is licensed MIT.
//
// Copyright (c) 2018 0xbitcoin.org
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
//
// ----------------------------------------------------------------------------
// Credits to infernal_toast, 0xBTC Contributors, Team and Supporters
// for the pioneering work on mineable tokens.
// ----------------------------------------------------------------------------
//
// ----------------------------------------------------------------------------

// Safe math and extended math libraries

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

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;

    }
}

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

// BEP20 interface compatible methods available

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

contract BEP20Interface {

    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);

    }
    
    function getOwner() external view returns (address) {
        
        return owner;
        
    }

}


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

contract _BNbitcoinToken is BEP20Interface, 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 = 2016;


    //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;


    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 lastRewardBscBlockNumber;

    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 _BNbitcoinToken() public onlyOwner{



        symbol = "BNBTC";

        name = "BNbitcoin Token - minable bitcoin on BSC";

        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();


    }




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


            //the PoW must contain work that includes a recent BSC 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;
            lastRewardBscBlockNumber = 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 BSC 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);






    }



    // Difficulty:
    //https://en.bitcoin.it/wiki/Difficulty#What_is_the_formula_for_difficulty.3F

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

        uint bscBlocksSinceLastDifficultyPeriod = block.number - latestDifficultyPeriodStarted;
		// One BSC block = 3 sec. --> assuming 1200 BSC blocks per hour

		// we want miners to spend 10 minutes to mine each 'block', about 200 BSC blocks = one BNbitcoin epoch
        uint epochsMined = _BLOCKS_PER_READJUSTMENT;

        uint targetBscBlocksPerDiffPeriod = epochsMined * 200; //should be 200 times slower than BSC

        //if, hypotetically, there were less BSC blocks passed in time than expected
        if( bscBlocksSinceLastDifficultyPeriod < targetBscBlocksPerDiffPeriod )
        {
          uint excess_block_pct = (targetBscBlocksPerDiffPeriod.mul(100)).div( bscBlocksSinceLastDifficultyPeriod );

          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 = (bscBlocksSinceLastDifficultyPeriod.mul(100)).div( targetBscBlocksPerDiffPeriod );

          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 BSC 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

    //

    // Warning: 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;

    }



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

    // The contract does not accept BNB directly

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

    function () public payable {

        revert();

    }



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

    // Any BEP20 standard token accidentally sent to the contract can be transferred out

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

    function transferAnyBEP20Token(address tokenAddress, uint tokens) public onlyOwner returns (bool success) {

        return BEP20Interface(tokenAddress).transfer(owner, tokens);

    }

}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://610e8e0eb949473ae61e66e4d6cdcd11f7ad80922fdc5dc83218d9bdfa43844c
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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