ETH Price: $3,115.98 (+0.22%)
Gas: 5 Gwei

Contract

0xE4EcBca33c5e29d34263400912157d4ddb26b49d
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

Multichain Info

No addresses found
Transaction Hash
Method
Block
From
To
Value
Approve170628382023-04-17 0:00:59384 days ago1681689659IN
0xE4EcBca3...ddb26b49d
0 ETH0.0006450926.74086512
Approve120531792021-03-17 1:23:481145 days ago1615944228IN
0xE4EcBca3...ddb26b49d
0 ETH0.01733194393.3
Approve116938472021-01-20 18:01:021200 days ago1611165662IN
0xE4EcBca3...ddb26b49d
0 ETH0.0019830645
Transfer116638322021-01-16 3:27:031205 days ago1610767623IN
0xE4EcBca3...ddb26b49d
0 ETH0.0031197261.0000015
Approve116561262021-01-14 23:23:521206 days ago1610666632IN
0xE4EcBca3...ddb26b49d
0 ETH0.0016740737.97821368
Transfer116528412021-01-14 11:02:031206 days ago1610622123IN
0xE4EcBca3...ddb26b49d
0 ETH0.0017704149.00000145
Transfer116528052021-01-14 10:53:201206 days ago1610621600IN
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0 ETH0.001500371
Transfer116527482021-01-14 10:41:361206 days ago1610620896IN
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0 ETH0.0019425238.00000145
Transfer116515252021-01-14 6:08:261207 days ago1610604506IN
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0 ETH0.0021131100
Transfer116514662021-01-14 5:52:431207 days ago1610603563IN
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0 ETH0.0028633356.00000145
Transfer116512682021-01-14 5:03:521207 days ago1610600632IN
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0 ETH0.0014157767
Transfer116511592021-01-14 4:40:441207 days ago1610599244IN
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0 ETH0.0097609190.9
Transfer116461652021-01-13 10:49:231207 days ago1610534963IN
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0 ETH0.0028904880
Transfer116461292021-01-13 10:40:341207 days ago1610534434IN
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0 ETH0.0021678660
Transfer116459892021-01-13 10:06:401207 days ago1610532400IN
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0 ETH0.0015536343
Transfer116260582021-01-10 8:42:501210 days ago1610268170IN
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0 ETH0.0013735165
Transfer116260572021-01-10 8:42:441210 days ago1610268164IN
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0 ETH0.0023485165
Transfer116117092021-01-08 3:56:111213 days ago1610078171IN
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0 ETH0.003476968.00000145
Transfer115660922021-01-01 3:48:061220 days ago1609472886IN
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0 ETH0.0035791770.00000156
Transfer115656922021-01-01 2:19:231220 days ago1609467563IN
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0 ETH0.001517542
Transfer115656922021-01-01 2:19:231220 days ago1609467563IN
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0 ETH0.001517542
Transfer115300682020-12-26 15:10:491225 days ago1608995449IN
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0 ETH0.0030060983.2
Transfer115182312020-12-24 19:31:291227 days ago1608838289IN
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0 ETH0.0016361932.00000145
Transfer115155142020-12-24 9:33:341227 days ago1608802414IN
0xE4EcBca3...ddb26b49d
0 ETH0.0015214372
Transfer114705122020-12-17 12:05:511234 days ago1608206751IN
0xE4EcBca3...ddb26b49d
0 ETH0.0035408398.00000145
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Latest 1 internal transaction

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104912702020-07-19 17:23:231385 days ago1595179403  Contract Creation0 ETH
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x1F832091...611225d46
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Nest_NToken

Compiler Version
v0.6.0+commit.26b70077

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, GNU GPLv3 license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2020-12-10
*/

pragma solidity 0.6.0;

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

//  voting contract 
interface Nest_3_VoteFactory {
    //  Check address 
	function checkAddress(string calldata name) external view returns (address contractAddress);
	//  check whether the administrator 
	function checkOwners(address man) external view returns (bool);
}

/**
 * @title NToken contract 
 * @dev Include standard erc20 method, mining method, and mining data 
 */
interface IERC20 {
    function totalSupply() external view returns (uint256);
    function balanceOf(address who) external view returns (uint256);
    function allowance(address owner, address spender) external view returns (uint256);
    function transfer(address to, uint256 value) external returns (bool);
    function approve(address spender, uint256 value) external returns (bool);
    function transferFrom(address from, address to, uint256 value) external returns (bool);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

contract Nest_NToken is IERC20 {
    using SafeMath for uint256;
    
    mapping (address => uint256) private _balances;                                 //  Balance ledger 
    mapping (address => mapping (address => uint256)) private _allowed;             //  Approval ledger 
    uint256 private _totalSupply = 0 ether;                                         //  Total supply 
    string public name;                                                             //  Token name 
    string public symbol;                                                           //  Token symbol 
    uint8 public decimals = 18;                                                     //  Precision
    uint256 public _createBlock;                                                    //  Create block number
    uint256 public _recentlyUsedBlock;                                              //  Recently used block number
    Nest_3_VoteFactory _voteFactory;                                                //  Voting factory contract
    address _bidder;                                                                //  Owner
    
    /**
    * @dev Initialization method
    * @param _name Token name
    * @param _symbol Token symbol
    * @param voteFactory Voting factory contract address
    * @param bidder Successful bidder address
    */
    constructor (string memory _name, string memory _symbol, address voteFactory, address bidder) public {
    	name = _name;                                                               
    	symbol = _symbol;
    	_createBlock = block.number;
    	_recentlyUsedBlock = block.number;
    	_voteFactory = Nest_3_VoteFactory(address(voteFactory));
    	_bidder = bidder;
    }
    
    /**
    * @dev Reset voting contract method
    * @param voteFactory Voting contract address
    */
    function changeMapping (address voteFactory) public onlyOwner {
    	_voteFactory = Nest_3_VoteFactory(address(voteFactory));
    }
    
    /**
    * @dev Additional issuance
    * @param value Additional issuance amount
    */
    function increaseTotal(uint256 value) public {
        address offerMain = address(_voteFactory.checkAddress("nest.nToken.offerMain"));
        require(address(msg.sender) == offerMain, "No authority");
        _balances[offerMain] = _balances[offerMain].add(value);
        _totalSupply = _totalSupply.add(value);
        _recentlyUsedBlock = block.number;
    }

    /**
    * @dev Check the total amount of tokens
    * @return Total supply
    */
    function totalSupply() override public view returns (uint256) {
        return _totalSupply;
    }

    /**
    * @dev Check address balance
    * @param owner Address to be checked
    * @return Return the balance of the corresponding address
    */
    function balanceOf(address owner) override public view returns (uint256) {
        return _balances[owner];
    }
    
    /**
    * @dev Check block information
    * @return createBlock Initial block number
    * @return recentlyUsedBlock Recently mined and issued block
    */
    function checkBlockInfo() public view returns(uint256 createBlock, uint256 recentlyUsedBlock) {
        return (_createBlock, _recentlyUsedBlock);
    }

    /**
     * @dev Check owner's approved allowance to the spender
     * @param owner Approving address
     * @param spender Approved address
     * @return Approved amount
     */
    function allowance(address owner, address spender) override public view returns (uint256) {
        return _allowed[owner][spender];
    }

    /**
    * @dev Transfer method
    * @param to Transfer target
    * @param value Transfer amount
    * @return Whether the transfer is successful
    */
    function transfer(address to, uint256 value) override public returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    /**
     * @dev Approval method
     * @param spender Approval target
     * @param value Approval amount
     * @return Whether the approval is successful
     */
    function approve(address spender, uint256 value) override public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;
    }

    /**
     * @dev Transfer tokens when approved
     * @param from Transfer-out account address
     * @param to Transfer-in account address
     * @param value Transfer amount
     * @return Whether approved transfer is successful
     */
    function transferFrom(address from, address to, uint256 value) override public returns (bool) {
        _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
        _transfer(from, to, value);
        emit Approval(from, msg.sender, _allowed[from][msg.sender]);
        return true;
    }

    /**
     * @dev Increase the allowance
     * @param spender Approval target
     * @param addedValue Amount to increase
     * @return whether increase is successful
     */
    function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue);
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }

    /**
     * @dev Decrease the allowance
     * @param spender Approval target
     * @param subtractedValue Amount to decrease
     * @return Whether decrease is successful
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
        require(spender != address(0));

        _allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue);
        emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
        return true;
    }

    /**
    * @dev Transfer method
    * @param to Transfer target
    * @param value Transfer amount
    */
    function _transfer(address from, address to, uint256 value) internal {
        _balances[from] = _balances[from].sub(value);
        _balances[to] = _balances[to].add(value);
        emit Transfer(from, to, value);
    }
    
    /**
    * @dev Check the creator
    * @return Creator address
    */
    function checkBidder() public view returns(address) {
        return _bidder;
    }
    
    /**
    * @dev Transfer creator
    * @param bidder New creator address
    */
    function changeBidder(address bidder) public {
        require(address(msg.sender) == _bidder);
        _bidder = bidder; 
    }
    
    // Administrator only
    modifier onlyOwner(){
        require(_voteFactory.checkOwners(msg.sender));
        _;
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"address","name":"voteFactory","type":"address"},{"internalType":"address","name":"bidder","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"_createBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"_recentlyUsedBlock","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"bidder","type":"address"}],"name":"changeBidder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"voteFactory","type":"address"}],"name":"changeMapping","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"checkBidder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"checkBlockInfo","outputs":[{"internalType":"uint256","name":"createBlock","type":"uint256"},{"internalType":"uint256","name":"recentlyUsedBlock","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"increaseTotal","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

Deployed Bytecode

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Swarm Source

ipfs://732ed18cfb08aa8ddce47e3df3862d172ea4dcb0bc2be56c6b5c9a2c5af587cb

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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Validator Index Block Amount
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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.