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Transfer90483322019-12-04 8:21:031801 days ago1575447663IN
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Transfer89485562019-11-17 4:53:001818 days ago1573966380IN
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Transfer89485532019-11-17 4:52:121818 days ago1573966332IN
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Transfer89485512019-11-17 4:51:461818 days ago1573966306IN
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Transfer87943132019-10-23 3:31:421843 days ago1571801502IN
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Transfer87462422019-10-15 13:50:291850 days ago1571147429IN
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Transfer84690752019-09-02 6:08:461894 days ago1567404526IN
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Transfer83875172019-08-20 13:37:001906 days ago1566308220IN
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Transfer80308412019-06-26 2:12:311962 days ago1561515151IN
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Transfer80308402019-06-26 2:12:211962 days ago1561515141IN
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Transfer78097452019-05-22 12:57:571996 days ago1558529877IN
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Transfer75865042019-04-17 16:55:432031 days ago1555520143IN
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Transfer75864612019-04-17 16:45:172031 days ago1555519517IN
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Transfer75864402019-04-17 16:41:552031 days ago1555519315IN
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Transfer75864162019-04-17 16:37:292031 days ago1555519049IN
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Transfer75829172019-04-17 3:28:122032 days ago1555471692IN
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Transfer75730512019-04-15 14:25:492033 days ago1555338349IN
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Transfer75727332019-04-15 13:13:562033 days ago1555334036IN
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Transfer74565742019-03-28 10:47:552052 days ago1553770075IN
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Transfer74563662019-03-28 9:56:102052 days ago1553766970IN
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Transfer74229602019-03-23 4:54:562057 days ago1553316896IN
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Transfer74161602019-03-22 3:35:442058 days ago1553225744IN
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Contract Source Code Verified (Exact Match)

Contract Name:
HashRateToken

Compiler Version
v0.4.25+commit.59dbf8f1

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2018-11-09
*/

pragma solidity ^0.4.24;


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 {
    function totalSupply() public view returns (uint256);
    function balanceOf(address _who) public view returns (uint256);
    function allowance(address _owner, address _spender) public view returns (uint256);
    function transfer(address _to, uint256 _value) public returns (bool);
    function approve(address _spender, uint256 _value) public returns (bool);
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}


/**
 * @title SafeMath
 * @dev Math operations with safety checks that revert on error
 */
library SafeMath {
    /**
    * @dev Multiplies two numbers, reverts on overflow.
    */
    function mul(uint256 _a, uint256 _b) internal pure returns (uint256) {
        uint256 c = _a * _b;
        assert(_a == 0 || c / _a == _b);

        return c;
    }

    /**
    * @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
    */
    function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
        uint256 c = _a / _b;
        return c;
    }

    /**
    * @dev Subtracts two numbers, reverts on overflow (i.e. if subtrahend is greater than minuend).
    */
    function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
        assert(_b <= _a);
        uint256 c = _a - _b;

        return c;
    }

    /**
    * @dev Adds two numbers, reverts on overflow.
    */
    function add(uint256 _a, uint256 _b) internal pure returns (uint256) {
        uint256 c = _a + _b;
        assert(c >= _a);

        return c;
    }
}


/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address public owner;

    event OwnershipRenounced(address indexed previousOwner);
    event OwnershipTransferred(address indexed previousOwner,address indexed newOwner);

    /**
    * @dev The Ownable constructor sets the original `owner` of the contract to the sender
    * account.
    */
    constructor() public {
        owner = msg.sender;
    }

    /**
    * @dev Throws if called by any account other than the owner.
    */
    modifier onlyOwner() {
        require(msg.sender == owner);
        _;
    }

    /**
    * @dev Allows the current owner to relinquish control of the contract.
    * @notice Renouncing to ownership will leave the contract without an owner.
    * It will not be possible to call the functions with the `onlyOwner`
    * modifier anymore.
    */
    function renounceOwnership() public onlyOwner {
        emit OwnershipRenounced(owner);
        owner = address(0);
    }

    /**
    * @dev Allows the current owner to transfer control of the contract to a newOwner.
    * @param _newOwner The address to transfer ownership to.
    */
    function transferOwnership(address _newOwner) public onlyOwner {
		require(_newOwner != address(0));
		emit OwnershipTransferred(owner, _newOwner);
        owner = _newOwner;
    }
}


/**
* @title Blacklisted
* @dev allow contract owner to add/remove address(es) to/from the blacklist
*/
contract Blacklisted is Ownable {
	mapping (address => bool) public blacklist;

	event SetBlacklist(address indexed _address, bool _bool);

	/**
	* @dev Modifier: throw if _address is in the blacklist
	*/
	modifier notInBlacklist(address _address) {
		require(blacklist[_address] == false);
		_;
	}

	/**
	* @dev call by the owner, set/unset single _address into the blacklist
	*/
	function setBlacklist(address _address, bool _bool) public onlyOwner {
		require(_address != address(0));
		
		blacklist[_address] = _bool;
		emit SetBlacklist(_address, _bool);
	}

	/**
	* @dev call by the owner, set/unset bulk _addresses into the blacklist
	*/
	function setBlacklistBulk(address[] _addresses, bool _bool) public onlyOwner {
		require(_addresses.length != 0);

		for(uint256 i = 0; i < _addresses.length; i++)
		{
			setBlacklist(_addresses[i], _bool);
		}
	}
}

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
    event Pause();
    event Unpause();

    bool public paused = false;

    /**
    * @dev Modifier to make a function callable only when the contract is not paused.
    */
    modifier whenNotPaused() {
        require(!paused);
        _;
    }

    /**
    * @dev Modifier to make a function callable only when the contract is paused.
    */
    modifier whenPaused() {
        require(paused);
        _;
    }

    /**
    * @dev called by the owner to pause, triggers stopped state
    */
    function pause() public onlyOwner whenNotPaused {
        paused = true;
        emit Pause();
    }

    /**
    * @dev called by the owner to unpause, returns to normal state
    */
    function unpause() public onlyOwner whenPaused {
        paused = false;
        emit Unpause();
    }
}


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20,Pausable,Blacklisted {
    using SafeMath for uint256;

    mapping(address => uint256) balances;

    mapping (address => mapping (address => uint256)) internal allowed;

    uint256 totalSupply_;

    /**
    * @dev Total number of tokens in existence
    */
    function totalSupply() public view returns (uint256) {
        return totalSupply_;
    }

    /**
    * @dev Gets the balance of the specified address.
    * @param _owner The address to query the the balance of.
    * @return An uint256 representing the amount owned by the passed address.
    */
    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }

    /**
    * @dev Function to check the amount of tokens that an owner allowed to a spender.
    * @param _owner address The address which owns the funds.
    * @param _spender address The address which will spend the funds.
    * @return A uint256 specifying the amount of tokens still available for the spender.
    */
    function allowance(address _owner, address _spender) public view returns (uint256) {
        return allowed[_owner][_spender];
    }

    /**
    * @dev Transfer token for a specified address
    * @param _to The address to transfer to.
    * @param _value The amount to be transferred.
    */
    function transfer(address _to, uint256 _value) whenNotPaused notInBlacklist(msg.sender) notInBlacklist(_to) public returns (bool) {
        require(_to != address(0));

        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);

        emit Transfer(msg.sender, _to, _value);
        return true;
    }


    /**
    * @dev Transfer tokens from one address to another
    * @param _from address The address which you want to send tokens from
    * @param _to address The address which you want to transfer to
    * @param _value uint256 the amount of tokens to be transferred
    */
    function transferFrom(address _from, address _to, uint256 _value) whenNotPaused notInBlacklist(msg.sender) notInBlacklist(_from) notInBlacklist(_to) public returns (bool) {
        require(_to != address(0));

        balances[_from] = balances[_from].sub(_value);
        balances[_to] = balances[_to].add(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);

        emit Transfer(_from, _to, _value);
        return true;
    }


    /**
    * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
    * @param _spender The address which will spend the funds.
    * @param _value The amount of tokens to be spent.
    */
    function approve(address _spender, uint256 _value) whenNotPaused public returns (bool) {
		require(_value == 0 || allowed[msg.sender][_spender] == 0 );
        allowed[msg.sender][_spender] = _value;

        emit Approval(msg.sender, _spender, _value);
        return true;
    }


    /**
    * @dev Increase the amount of tokens that an owner allowed to a spender.
    * approve should be called when allowed[_spender] == 0. To increment
    * allowed value is better to use this function to avoid 2 calls (and wait until
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    * @param _spender The address which will spend the funds.
    * @param _addedValue The amount of tokens to increase the allowance by.
    */
    function increaseApproval(address _spender, uint256 _addedValue) whenNotPaused public returns (bool) {
        allowed[msg.sender][_spender] = (allowed[msg.sender][_spender].add(_addedValue));

        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }

    /**
    * @dev Decrease the amount of tokens that an owner allowed to a spender.
    * approve should be called when allowed[_spender] == 0. To decrement
    * allowed value is better to use this function to avoid 2 calls (and wait until
    * the first transaction is mined)
    * From MonolithDAO Token.sol
    * @param _spender The address which will spend the funds.
    * @param _subtractedValue The amount of tokens to decrease the allowance by.
    */
    function decreaseApproval(address _spender, uint256 _subtractedValue) whenNotPaused public returns (bool) {
        uint256 oldValue = allowed[msg.sender][_spender];
        if (_subtractedValue >= oldValue) {
            allowed[msg.sender][_spender] = 0;
        } else {
            allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
        }

        emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
        return true;
    }
}


/**
 * @title Burnable Token
 * @dev Token that can be irreversibly burned (destroyed).
 */
contract BurnableToken is StandardToken {

    event Burn(address indexed burner, uint256 value);

    /**
    * @dev Burns a specific amount of tokens.
    * @param _value The amount of token to be burned.
    */
    function burn(uint256 _value) whenNotPaused public {
        _burn(msg.sender, _value);
    }

    /**
    * @dev Burns a specific amount of tokens from the target address and decrements allowance
    * @param _from address The address which you want to send tokens from
    * @param _value uint256 The amount of token to be burned
    */
    function burnFrom(address _from, uint256 _value) whenNotPaused public {
        require(_value <= allowed[_from][msg.sender]);

        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        _burn(_from, _value);
    }

    function _burn(address _who, uint256 _value) internal {
        require(_value <= balances[_who]);

        balances[_who] = balances[_who].sub(_value);
        totalSupply_ = totalSupply_.sub(_value);

        emit Burn(_who, _value);
        emit Transfer(_who, address(0), _value);
    }
}


/**
* @title HashRateToken
* @dev	main contract Hash Rate Token
*/
contract HashRateToken is BurnableToken {
    string public constant name = "Hash Rate Token";
    string public constant symbol = "HRT";
    uint8 public constant decimals = 18;
    uint256 public constant INITIAL_SUPPLY = 400000000;
    
	mapping(address => string) public keys;

    constructor() public {
        totalSupply_ = INITIAL_SUPPLY * (10 ** uint256(decimals));
        balances[msg.sender] = totalSupply_;
        emit Transfer(address(0), msg.sender, totalSupply_);
    }

	event Register(address _address, string _key);
	function register(string _key) whenNotPaused notInBlacklist(msg.sender) public
	{
		require(bytes(_key).length <= 64);

		keys[msg.sender] = _key;
		emit Register(msg.sender, _key);
	}
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://39b93954062c1d6ec48a7dd92de592a9eb7f203b0f891aae8fe9e0c6ab759078

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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.