ETH Price: $3,424.81 (-4.81%)
Gas: 29 Gwei

Contract

0x539EfE69bCDd21a83eFD9122571a64CC25e0282b
 
Transaction Hash
Method
Block
From
To
Value
Transfer194391122024-03-15 8:19:593 days ago1710490799IN
Blue Protocol: BLUE Token
0 ETH0.00315262105
Transfer194320182024-03-14 8:19:354 days ago1710404375IN
Blue Protocol: BLUE Token
0 ETH0.0023099549.0176841
Approve194162282024-03-12 3:10:237 days ago1710213023IN
Blue Protocol: BLUE Token
0 ETH0.0023381550.39562313
Approve194117862024-03-11 12:14:117 days ago1710159251IN
Blue Protocol: BLUE Token
0 ETH0.0031734368.48736383
Approve194026822024-03-10 5:43:238 days ago1710049403IN
Blue Protocol: BLUE Token
0 ETH0.001376247.07212119
Approve194026692024-03-10 5:40:478 days ago1710049247IN
Blue Protocol: BLUE Token
0 ETH0.001164144.56061391
Approve193965412024-03-09 9:07:359 days ago1709975255IN
Blue Protocol: BLUE Token
0 ETH0.0022363848.59162223
Approve193964882024-03-09 8:56:359 days ago1709974595IN
Blue Protocol: BLUE Token
0 ETH0.002025543.65685141
Approve193838782024-03-07 14:25:3511 days ago1709821535IN
Blue Protocol: BLUE Token
0 ETH0.0040043486.30787915
Approve193353052024-02-29 19:38:3518 days ago1709235515IN
Blue Protocol: BLUE Token
0 ETH0.0030245865.19054793
Approve193153422024-02-27 0:34:3521 days ago1708994075IN
Blue Protocol: BLUE Token
0 ETH0.0018541640.01564199
Approve192015522024-02-11 1:26:5937 days ago1707614819IN
Blue Protocol: BLUE Token
0 ETH0.0010365722.34200697
Approve191977702024-02-10 12:40:4737 days ago1707568847IN
Blue Protocol: BLUE Token
0 ETH0.0007810232.40787752
Transfer189758622024-01-10 10:10:1168 days ago1704881411IN
Blue Protocol: BLUE Token
0 ETH0.002161872
Transfer189389832024-01-05 5:25:1173 days ago1704432311IN
Blue Protocol: BLUE Token
0 ETH0.0007434214.32387185
Transfer189389692024-01-05 5:22:2373 days ago1704432143IN
Blue Protocol: BLUE Token
0 ETH0.0005873919.57144664
Transfer188372532023-12-21 22:34:4788 days ago1703198087IN
Blue Protocol: BLUE Token
0 ETH0.0009543532.04142088
Approve188149722023-12-18 19:32:3591 days ago1702927955IN
Blue Protocol: BLUE Token
0 ETH0.00320537122.7548759
Approve188023972023-12-17 1:10:5993 days ago1702775459IN
Blue Protocol: BLUE Token
0 ETH0.0013939630.08386887
Approve187941082023-12-15 21:11:5994 days ago1702674719IN
Blue Protocol: BLUE Token
0 ETH0.001894440.8312462
Approve187789572023-12-13 18:13:2396 days ago1702491203IN
Blue Protocol: BLUE Token
0 ETH0.003491275.24797213
Transfer187516952023-12-09 22:39:23100 days ago1702161563IN
Blue Protocol: BLUE Token
0 ETH0.0015864333.66436175
Transfer187193502023-12-05 9:47:47104 days ago1701769667IN
Blue Protocol: BLUE Token
0 ETH0.0014563553.493214
Transfer187033682023-12-03 4:03:35106 days ago1701576215IN
Blue Protocol: BLUE Token
0 ETH0.0009545227.42800268
Transfer187010832023-12-02 20:23:35107 days ago1701548615IN
Blue Protocol: BLUE Token
0 ETH0.0016668235.37932544
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Contract Source Code Verified (Exact Match)

Contract Name:
BLUECoin

Compiler Version
v0.4.17+commit.bdeb9e52

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2017-10-18
*/

pragma solidity ^0.4.13;

contract ERC20Basic {
  uint256 public totalSupply;
  function balanceOf(address who) public constant returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public constant returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract Ownable {
  address public owner;

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

  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
  function Ownable() {
    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 transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) onlyOwner public {
    require(newOwner != address(0));
    OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }
}

library SaferMath {
  function mulX(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function divX(uint256 a, uint256 b) internal constant returns (uint256) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint256 a, uint256 b) internal constant returns (uint256) {
    assert(b <= a);
    return a - b;
  }

  function add(uint256 a, uint256 b) internal constant returns (uint256) {
    uint256 c = a + b;
    assert(c >= a);
    return c;
  }
}

contract BasicToken is ERC20Basic {
  using SaferMath for uint256;
  mapping(address => uint256) balances;
  /**
  * @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) public returns (bool) {
    require(_to != address(0));

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @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 constant returns (uint256 balance) {
    return balances[_owner];
  }

}

contract StandardToken is ERC20, BasicToken {

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


  /**
   * @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) public returns (bool) {
    require(_to != address(0));

    uint256 _allowance = allowed[_from][msg.sender];

    // Check is not needed because sub(_allowance, _value) will already throw if this condition is not met
    // require (_value <= _allowance);

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

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @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 constant returns (uint256 remaining) {
    return allowed[_owner][_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
   */
  function increaseApproval (address _spender, uint _addedValue) returns (bool success) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  function decreaseApproval (address _spender, uint _subtractedValue) returns (bool success) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }
}

contract BLUECoin is StandardToken, Ownable {

  string public constant name = "Ethereum Blue";
  string public constant symbol = "BLUE";
  uint8 public constant decimals = 8;

  uint256 public constant SUPPLY_CAP = 42000000 * (10 ** uint256(decimals));

  address NULL_ADDRESS = address(0);

  uint public nonce = 0;

event NonceTick(uint nonce);
  function incNonce() {
    nonce += 1;
    if(nonce > 100) {
        nonce = 0;
    }
    NonceTick(nonce);
  }

  // Note intended to act as a source of authorized messaging from development team
  event NoteChanged(string newNote);
  string public note = "Welcome to the future of cryptocurrency.";
  function setNote(string note_) public onlyOwner {
      note = note_;
      NoteChanged(note);
  }
  
  event PerformingDrop(uint count);
  function drop(address[] addresses, uint256 amount) public onlyOwner {
    uint256 amt = amount * 10**8;
    require(amt > 0);
    require(amt <= SUPPLY_CAP);
    PerformingDrop(addresses.length);
    
    // Maximum drop is 1000 addresses
    assert(addresses.length <= 1000);
    assert(balances[owner] >= amt * addresses.length);
    for (uint i = 0; i < addresses.length; i++) {
      address recipient = addresses[i];
      if(recipient != NULL_ADDRESS) {
        balances[owner] -= amt;
        balances[recipient] += amt;
        Transfer(owner, recipient, amt);
      }
    }
  }

  /**
   * @dev Constructor that gives msg.sender all of existing tokens..
   */
  function BLUECoin() {
    totalSupply = SUPPLY_CAP;
    balances[msg.sender] = SUPPLY_CAP;
  }
}

Contract Security Audit

Contract ABI

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Swarm Source

bzzr://bd5eb74241a60f90246a84b5e80dec153d0965de9b8ee833bfaf53a95fc2cc36

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

BLUE is anERC20 token built from the ground-up to facilitate payments and transfers without sacrificing your security.

Validator Index Block Amount
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Txn Hash Block Value Eth2 PubKey Valid
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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.