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Contract

0x3fE856E55C4076682400f23d6bE7dd737ee7E947
 

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Transfer166361092023-02-15 19:04:47679 days ago1676487887IN
0x3fE856E5...37ee7E947
0 ETH0.0019974542.71449168
Transfer155836012022-09-21 18:42:59826 days ago1663785779IN
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0 ETH0.0015540433.2494695
Transfer147903752022-05-17 4:21:16953 days ago1652761276IN
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Transfer134628792021-10-21 19:26:351161 days ago1634844395IN
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Transfer113909992020-12-05 6:24:431481 days ago1607149483IN
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Transfer99907822020-05-03 3:23:171697 days ago1588476197IN
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Transfer98070012020-04-04 17:54:101726 days ago1586022850IN
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Transfer98068182020-04-04 17:12:581726 days ago1586020378IN
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Transfer95557842020-02-26 0:12:411764 days ago1582675961IN
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Transfer95386042020-02-23 8:48:021767 days ago1582447682IN
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Transfer95386012020-02-23 8:47:371767 days ago1582447657IN
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Transfer94625102020-02-11 15:32:341779 days ago1581435154IN
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Transfer94393962020-02-08 2:26:041782 days ago1581128764IN
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Transfer94393522020-02-08 2:17:111782 days ago1581128231IN
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Transfer92661142020-01-12 12:25:271809 days ago1578831927IN
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Transfer92660652020-01-12 12:15:141809 days ago1578831314IN
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Transfer92453612020-01-09 8:23:071812 days ago1578558187IN
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Transfer92204162020-01-05 12:34:111816 days ago1578227651IN
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Transfer92204152020-01-05 12:33:451816 days ago1578227625IN
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Transfer90868272019-12-11 4:13:111841 days ago1576037591IN
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Transfer90868262019-12-11 4:12:441841 days ago1576037564IN
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Transfer90484642019-12-04 8:55:161848 days ago1575449716IN
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Transfer90484552019-12-04 8:52:421848 days ago1575449562IN
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Transfer90410162019-12-03 1:04:511849 days ago1575335091IN
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Transfer90409762019-12-03 0:56:121849 days ago1575334572IN
0x3fE856E5...37ee7E947
0 ETH0.0012861725
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Contract Source Code Verified (Exact Match)

Contract Name:
BigKeyCoin

Compiler Version
v0.4.23+commit.124ca40d

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity Multiple files format)

File 1 of 3: BigKeyCoin.sol
/*
This Token Contract implements the standard token functionality (https://github.com/ethereum/EIPs/issues/20) as well as the following OPTIONAL extras intended for use by humans.

In other words. This is intended for deployment in something like a Token Factory or Mist wallet, and then used by humans.
Imagine coins, currencies, shares, voting weight, etc.
Machine-based, rapid creation of many tokens would not necessarily need these extra features or will be minted in other manners.

1) Initial Finite Supply (upon creation one specifies how much is minted).
2) In the absence of a token registry: Optional Decimal, Symbol & Name.
3) Optional approveAndCall() functionality to notify a contract if an approval() has occurred.

.*/
pragma solidity ^0.4.4;

import "./StandardToken.sol";

contract BigKeyCoin is StandardToken {

    function () {
        //if ether is sent to this address, send it back.
        throw;
    }

    /* Public variables of the token */

    /*
    NOTE:
    The following variables are OPTIONAL vanities. One does not have to include them.
    They allow one to customise the token contract & in no way influences the core functionality.
    Some wallets/interfaces might not even bother to look at this information.
    */
    string public name;                   //token名称: BigKeyCoin 
    uint8 public decimals;                //小数位
    string public symbol;                 //标识
    string public version = 'H0.1';       //版本号

    function BigKeyCoin(
        uint256 _initialAmount,
        string _tokenName,
        uint8 _decimalUnits,
        string _tokenSymbol
        ) {
        balances[msg.sender] = _initialAmount;               // 合约发布者的余额是发行数量
        totalSupply = _initialAmount;                        // 发行量
        name = _tokenName;                                   // token名称
        decimals = _decimalUnits;                            // token小数位
        symbol = _tokenSymbol;                               // token标识
    }

    /* 批准然后调用接收合约 */
    function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);

        //调用你想要通知合约的 receiveApprovalcall 方法 ,这个方法是可以不需要包含在这个合约里的。
        //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
        //假设这么做是可以成功,不然应该调用vanilla approve。
        if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
        return true;
    }
}

File 2 of 3: StandardToken.sol
/*
This implements ONLY the standard functions and NOTHING else.
For a token like you would want to deploy in something like Mist, see HumanStandardToken.sol.

If you deploy this, you won't have anything useful.

Implements ERC 20 Token standard: https://github.com/ethereum/EIPs/issues/20

实现ERC20标准
.*/

pragma solidity ^0.4.4;

import "./Token.sol";

contract StandardToken is Token {

    function transfer(address _to, uint256 _value) returns (bool success) {
        //默认token发行量不能超过(2^256 - 1)
        //如果你不设置发行量,并且随着时间的发型更多的token,需要确保没有超过最大值,使用下面的 if 语句
        //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
        if (balances[msg.sender] >= _value && _value > 0) {
            balances[msg.sender] -= _value;
            balances[_to] += _value;
            Transfer(msg.sender, _to, _value);
            return true;
        } else { return false; }
    }

    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        //向上面的方法一样,如果你想确保发行量不超过最大值
        //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
            balances[_to] += _value;
            balances[_from] -= _value;
            allowed[_from][msg.sender] -= _value;
            Transfer(_from, _to, _value);
            return true;
        } else { return false; }
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
      return allowed[_owner][_spender];
    }

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    uint256 public totalSupply;
}

File 3 of 3: Token.sol
pragma solidity ^0.4.4;

contract Token {

    /// @return 返回token的发行量
    function totalSupply() constant returns (uint256 supply) {}

    /// @param _owner 查询以太坊地址token余额
    /// @return The balance 返回余额
    function balanceOf(address _owner) constant returns (uint256 balance) {}

    /// @notice msg.sender(交易发送者)发送 _value(一定数量)的 token 到 _to(接受者)  
    /// @param _to 接收者的地址
    /// @param _value 发送token的数量
    /// @return 是否成功
    function transfer(address _to, uint256 _value) returns (bool success) {}

    /// @notice 发送者 发送 _value(一定数量)的 token 到 _to(接受者)  
    /// @param _from 发送者的地址
    /// @param _to 接收者的地址
    /// @param _value 发送的数量
    /// @return 是否成功
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}

    /// @notice 发行方 批准 一个地址发送一定数量的token
    /// @param _spender 需要发送token的地址
    /// @param _value 发送token的数量
    /// @return 是否成功
    function approve(address _spender, uint256 _value) returns (bool success) {}

    /// @param _owner 拥有token的地址
    /// @param _spender 可以发送token的地址
    /// @return 还允许发送的token的数量
    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}

    /// 发送Token事件
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    /// 批准事件
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}

Contract Security Audit

Contract ABI

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Deployed Bytecode

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000000000000000000000000000016345785d8a00000000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000800000000000000000000000000000000000000000000000000000000000000c000000000000000000000000000000000000000000000000000000000000000084e616572436f696e00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000044e41455200000000000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _initialAmount (uint256): 100000000000000000
Arg [1] : _tokenName (string): NaerCoin
Arg [2] : _decimalUnits (uint8): 8
Arg [3] : _tokenSymbol (string): NAER

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 000000000000000000000000000000000000000000000000016345785d8a0000
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [3] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [5] : 4e616572436f696e000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000004
Arg [7] : 4e41455200000000000000000000000000000000000000000000000000000000


Deployed Bytecode Sourcemap

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Swarm Source

bzzr://8aa079c9cbe14c4c3729468db378c6e85244dcff74ac284d7dbe13e3f31ac8e3

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