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Approve222037452025-04-05 15:55:479 days ago1743868547IN
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Transfer221975802025-04-04 19:14:3510 days ago1743794075IN
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Approve221821542025-04-02 15:34:4712 days ago1743608087IN
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Approve220881302025-03-20 12:39:4726 days ago1742474387IN
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Transfer220866582025-03-20 7:43:5926 days ago1742456639IN
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Approve220700832025-03-18 0:07:4728 days ago1742256467IN
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Transfer220476632025-03-14 21:00:4731 days ago1741986047IN
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Approve218157642025-02-10 11:16:5964 days ago1739186219IN
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Approve217926592025-02-07 5:51:2367 days ago1738907483IN
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Transfer217821422025-02-05 18:39:5968 days ago1738780799IN
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Transfer217671902025-02-03 16:31:3570 days ago1738600295IN
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Approve217545372025-02-01 22:04:4772 days ago1738447487IN
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Approve217190572025-01-27 23:10:3577 days ago1738019435IN
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Approve216964492025-01-24 19:27:4780 days ago1737746867IN
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Approve215576842025-01-05 10:29:23100 days ago1736072963IN
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Transfer215260592025-01-01 0:33:47104 days ago1735691627IN
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Approve215260492025-01-01 0:31:47104 days ago1735691507IN
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Transfer215260332025-01-01 0:28:35104 days ago1735691315IN
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Transfer215250452024-12-31 21:10:11104 days ago1735679411IN
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Contract Source Code Verified (Exact Match)

Contract Name:
HVNToken

Compiler Version
v0.4.13+commit.fb4cb1a

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2017-09-07
*/

/**
 * ERC-20 Standard Token Smart Contract implementation.
 * 
 * Copyright © 2017 by Hive Project Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND (express or implied).
 */

pragma solidity ^0.4.11;

/**
 * ERC-20 Standard Token Smart Contract Interface.
 *
 * Copyright © 2017 by Hive Project Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND (express or implied).
 */


/**
 * ERC-20 standard token interface, as defined
 * <a href="http://github.com/ethereum/EIPs/issues/20">here</a>.
 */
contract ERC20Interface {
  /**
   * Get total number of tokens in circulation.
   */
  uint256 public totalSupply;

  /**
   * @dev Get number of tokens currently belonging to given owner.
   *
   * @param _owner address to get number of tokens currently belonging to the
   *         owner of
   * @return number of tokens currently belonging to the owner of given address
   */
  function balanceOf (address _owner) constant returns (uint256 balance);

  /**
   * @dev Transfer given number of tokens from message sender to given recipient.
   *
   * @param _to address to transfer tokens to the owner of
   * @param _value number of tokens to transfer to the owner of given address
   * @return true if tokens were transferred successfully, false otherwise
   */
  function transfer (address _to, uint256 _value) returns (bool success);

  /**
   * @dev Transfer given number of tokens from given owner to given recipient.
   *
   * @param _from address to transfer tokens from the owner of
   * @param _to address to transfer tokens to the owner of
   * @param _value number of tokens to transfer from given owner to given
   *         recipient
   * @return true if tokens were transferred successfully, false otherwise
   */
  function transferFrom (address _from, address _to, uint256 _value)
  returns (bool success);

  /**
   * @dev Allow given spender to transfer given number of tokens from message sender.
   *
   * @param _spender address to allow the owner of to transfer tokens from
   *         message sender
   * @param _value number of tokens to allow to transfer
   * @return true if token transfer was successfully approved, false otherwise
   */
  function approve (address _spender, uint256 _value) returns (bool success);

  /**
   * @dev Tell how many tokens given spender is currently allowed to transfer from
   * given owner.
   *
   * @param _owner address to get number of tokens allowed to be transferred
   *        from the owner of
   * @param _spender address to get number of tokens allowed to be transferred
   *        by the owner of
   * @return number of tokens given spender is currently allowed to transfer
   *         from given owner
   */
  function allowance (address _owner, address _spender) constant
  returns (uint256 remaining);

  /**
   * @dev Logged when tokens were transferred from one owner to another.
   *
   * @param _from address of the owner, tokens were transferred from
   * @param _to address of the owner, tokens were transferred to
   * @param _value number of tokens transferred
   */
  event Transfer (address indexed _from, address indexed _to, uint256 _value);

  /**
   * @dev Logged when owner approved his tokens to be transferred by some spender.
   *
   * @param _owner owner who approved his tokens to be transferred
   * @param _spender spender who were allowed to transfer the tokens belonging
   *        to the owner
   * @param _value number of tokens belonging to the owner, approved to be
   *        transferred by the spender
   */
  event Approval (
    address indexed _owner, address indexed _spender, uint256 _value);
}


contract Owned {
    address public owner;
    address public newOwner;

    function Owned() {
        owner = msg.sender;
    }

    modifier ownerOnly {
        assert(msg.sender == owner);
        _;
    }

    /**
     * @dev Transfers ownership. New owner has to accept in order ownership change to take effect
     */
    function transferOwnership(address _newOwner) public ownerOnly {
        require(_newOwner != owner);
        newOwner = _newOwner;
    }

    /**
     * @dev Accepts transferred ownership
     */
    function acceptOwnership() public {
        require(msg.sender == newOwner);
        OwnerUpdate(owner, newOwner);
        owner = newOwner;
        newOwner = 0x0;
    }

    event OwnerUpdate(address _prevOwner, address _newOwner);
}

/**
 * Safe Math Smart Contract.  
 * 
 * Copyright © 2017 by Hive Project Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND (express or implied).
 */
 

/**
 * Provides methods to safely add, subtract and multiply uint256 numbers.
 */
contract SafeMath {
 
  /**
   * @dev Add two uint256 values, throw in case of overflow.
   *
   * @param a first value to add
   * @param b second value to add
   * @return x + y
   */
    function add(uint256 a, uint256 b) internal constant returns (uint256) {
        uint256 c = a + b;
        assert(c >= a);
        return c;
    }

  /**
   * @dev Subtract one uint256 value from another, throw in case of underflow.
   *
   * @param a value to subtract from
   * @param b value to subtract
   * @return a - b
   */
    function sub(uint256 a, uint256 b) internal constant returns (uint256) {
        assert(b <= a);
        return a - b;
    }


  /**
   * @dev Multiply two uint256 values, throw in case of overflow.
   *
   * @param a first value to multiply
   * @param b second value to multiply
   * @return c = a * b
   */
    function mul(uint256 a, uint256 b) internal constant returns (uint256) {
        uint256 c = a * b;
        assert(a == 0 || c / a == b);
        return c;
    }

 /**
   * @dev Divide two uint256 values, throw in case of overflow.
   *
   * @param a first value to divide
   * @param b second value to divide
   * @return c = a / b
   */
        function div(uint256 a, uint256 b) internal constant returns (uint256) {
        uint256 c = a / b;
        return c;
    }
}

/*
 * TokenRecepient
 *
 * Copyright © 2017 by Hive Project Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND (express or implied).
 */


contract TokenRecipient {
    /**
     * receive approval
     */
    function receiveApproval(address _from, uint256 _value, address _to, bytes _extraData);
}

/**
 * Standard Token Smart Contract that implements ERC-20 token interface
 */
contract HVNToken is ERC20Interface, SafeMath, Owned {

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    string public constant name = "Hive Project Token";
    string public constant symbol = "HVN";
    uint8 public constant decimals = 8;
    string public version = '0.0.2';

    bool public transfersFrozen = false;

    /**
     * Protection against short address attack
     */
    modifier onlyPayloadSize(uint numwords) {
        assert(msg.data.length == numwords * 32 + 4);
        _;
    }

    /**
     * Check if transfers are on hold - frozen
     */
    modifier whenNotFrozen(){
        if (transfersFrozen) revert();
        _;
    }


    function HVNToken() ownerOnly {
        totalSupply = 50000000000000000;
        balances[owner] = totalSupply;
    }


    /**
     * Freeze token transfers.
     */
    function freezeTransfers () ownerOnly {
        if (!transfersFrozen) {
            transfersFrozen = true;
            Freeze (msg.sender);
        }
    }


    /**
     * Unfreeze token transfers.
     */
    function unfreezeTransfers () ownerOnly {
        if (transfersFrozen) {
            transfersFrozen = false;
            Unfreeze (msg.sender);
        }
    }


    /**
     * Transfer sender's tokens to a given address
     */
    function transfer(address _to, uint256 _value) whenNotFrozen onlyPayloadSize(2) returns (bool success) {
        require(_to != 0x0);

        balances[msg.sender] = sub(balances[msg.sender], _value);
        balances[_to] += _value;
        Transfer(msg.sender, _to, _value);
        return true;
    }


    /**
     * Transfer _from's tokens to _to's address
     */
    function transferFrom(address _from, address _to, uint256 _value) whenNotFrozen onlyPayloadSize(3) returns (bool success) {
        require(_to != 0x0);
        require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value);

        balances[_from] = sub(balances[_from], _value);
        balances[_to] += _value;
        allowed[_from][msg.sender] = sub(allowed[_from][msg.sender], _value);
        Transfer(_from, _to, _value);
        return true;
    }


    /**
     * Returns number of tokens owned by given address.
     */
    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }


    /**
     * Sets approved amount of tokens for spender.
     */
    function approve(address _spender, uint256 _value) returns (bool success) {
        require(_value == 0 || allowed[msg.sender][_spender] == 0);
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }


    /**
     * Approve and then communicate the approved contract in a single transaction
     */
    function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
        TokenRecipient spender = TokenRecipient(_spender);
        if (approve(_spender, _value)) {
            spender.receiveApproval(msg.sender, _value, this, _extraData);
            return true;
        }
    }


    /**
     * Returns number of allowed tokens for given address.
     */
    function allowance(address _owner, address _spender) onlyPayloadSize(2) constant returns (uint256 remaining) {
        return allowed[_owner][_spender];
    }


    /**
     * Peterson's Law Protection
     * Claim tokens
     */
    function claimTokens(address _token) ownerOnly {
        if (_token == 0x0) {
            owner.transfer(this.balance);
            return;
        }

        HVNToken token = HVNToken(_token);
        uint balance = token.balanceOf(this);
        token.transfer(owner, balance);

        Transfer(_token, owner, balance);
    }


    event Freeze (address indexed owner);
    event Unfreeze (address indexed owner);
}

Contract Security Audit

Contract ABI

API
[{"constant":false,"inputs":[],"name":"freezeTransfers","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"unfreezeTransfers","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"}],"name":"balanceOf","outputs":[{"name":"balance","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[],"name":"acceptOwnership","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"},{"name":"_extraData","type":"bytes"}],"name":"approveAndCall","outputs":[{"name":"success","type":"bool"}],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"newOwner","outputs":[{"name":"","type":"address"}],"payable":false,"type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_token","type":"address"}],"name":"claimTokens","outputs":[],"payable":false,"type":"function"},{"constant":true,"inputs":[],"name":"transfersFrozen","outputs":[{"name":"","type":"bool"}],"payable":false,"type":"function"},{"constant":false,"inputs":[{"name":"_newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"type":"function"},{"inputs":[],"payable":false,"type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"}],"name":"Freeze","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"}],"name":"Unfreeze","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_prevOwner","type":"address"},{"indexed":false,"name":"_newOwner","type":"address"}],"name":"OwnerUpdate","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_from","type":"address"},{"indexed":true,"name":"_to","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_owner","type":"address"},{"indexed":true,"name":"_spender","type":"address"},{"indexed":false,"name":"_value","type":"uint256"}],"name":"Approval","type":"event"}]

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Swarm Source

bzzr://ac97e2e285afd3f7d22867aca33998a003ff8253011133fa8d5c0ab256b2f0e2

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