ETH Price: $1,623.97 (+2.06%)
 
Transaction Hash
Method
Block
From
To
Transfer222202612025-04-07 23:20:475 days ago1744068047IN
Simple Token
0 ETH0.000038390.77662768
Approve222009952025-04-05 6:42:358 days ago1743835355IN
Simple Token
0 ETH0.000020570.44354297
Approve221796892025-04-02 7:19:4711 days ago1743578387IN
Simple Token
0 ETH0.000034790.75
Transfer221792992025-04-02 6:01:1111 days ago1743573671IN
Simple Token
0 ETH0.000020540.63553085
Transfer221792982025-04-02 6:00:5911 days ago1743573659IN
Simple Token
0 ETH0.000020760.64227588
Transfer221792962025-04-02 6:00:3511 days ago1743573635IN
Simple Token
0 ETH0.000020390.63083678
Transfer221792952025-04-02 6:00:2311 days ago1743573623IN
Simple Token
0 ETH0.000018910.58500084
Transfer221792892025-04-02 5:59:1111 days ago1743573551IN
Simple Token
0 ETH0.000018760.58042395
Transfer221792852025-04-02 5:58:2311 days ago1743573503IN
Simple Token
0 ETH0.000019040.58898558
Transfer221792832025-04-02 5:57:5911 days ago1743573479IN
Simple Token
0 ETH0.000020060.62089025
Transfer221792792025-04-02 5:57:1111 days ago1743573431IN
Simple Token
0 ETH0.000020090.62178876
Transfer221792782025-04-02 5:56:5911 days ago1743573419IN
Simple Token
0 ETH0.000019650.60814819
Transfer221792772025-04-02 5:56:4711 days ago1743573407IN
Simple Token
0 ETH0.00003180.64357605
Approve221419182025-03-28 0:45:5916 days ago1743122759IN
Simple Token
0 ETH0.000034870.75162928
Transfer221419062025-03-28 0:43:3516 days ago1743122615IN
Simple Token
0 ETH0.000052761.06726745
Approve221021432025-03-22 11:32:5921 days ago1742643179IN
Simple Token
0 ETH0.000022310.92750972
Approve221016532025-03-22 9:54:4722 days ago1742637287IN
Simple Token
0 ETH0.000111322.40230279
Transfer220805232025-03-19 11:08:5924 days ago1742382539IN
Simple Token
0 ETH0.000136182.51074063
Transfer220392282025-03-13 16:45:2330 days ago1741884323IN
Simple Token
0 ETH0.000102333.16562053
Approve220289942025-03-12 6:27:5932 days ago1741760879IN
Simple Token
0 ETH0.000085971.85299297
Transfer220176462025-03-10 16:24:3533 days ago1741623875IN
Simple Token
0 ETH0.000213083.92940541
Approve220129532025-03-10 0:40:3534 days ago1741567235IN
Simple Token
0 ETH0.0001483.19488749
Approve220104742025-03-09 16:22:3534 days ago1741537355IN
Simple Token
0 ETH0.000038380.82733159
Approve220002092025-03-08 5:56:4736 days ago1741413407IN
Simple Token
0 ETH0.000119542.57647887
Approve219998162025-03-08 4:37:3536 days ago1741408655IN
Simple Token
0 ETH0.000096412.08113243
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Contract Source Code Verified (Exact Match)

Contract Name:
SimpleToken

Compiler Version
v0.4.18+commit.9cf6e910

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2017-11-12
*/

pragma solidity ^0.4.17;

// ----------------------------------------------------------------------------
// Simple Token Contract
//
// Copyright (c) 2017 OpenST Ltd.
// https://simpletoken.org/
//
// The MIT Licence.
// ----------------------------------------------------------------------------

// ----------------------------------------------------------------------------
// SafeMath Library Implementation
//
// Copyright (c) 2017 OpenST Ltd.
// https://simpletoken.org/
//
// The MIT Licence.
//
// Based on the SafeMath library by the OpenZeppelin team.
// Copyright (c) 2016 Smart Contract Solutions, Inc.
// https://github.com/OpenZeppelin/zeppelin-solidity
// The MIT License.
// ----------------------------------------------------------------------------


library SafeMath {

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a * b;

        assert(a == 0 || c / a == b);

        return c;
    }


    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // 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 pure returns (uint256) {
        assert(b <= a);

        return a - b;
    }


    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;

        assert(c >= a);

        return c;
    }
}

//
// Implements basic ownership with 2-step transfers.
//
contract Owned {

    address public owner;
    address public proposedOwner;

    event OwnershipTransferInitiated(address indexed _proposedOwner);
    event OwnershipTransferCompleted(address indexed _newOwner);


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


    modifier onlyOwner() {
        require(isOwner(msg.sender));
        _;
    }


    function isOwner(address _address) internal view returns (bool) {
        return (_address == owner);
    }


    function initiateOwnershipTransfer(address _proposedOwner) public onlyOwner returns (bool) {
        proposedOwner = _proposedOwner;

        OwnershipTransferInitiated(_proposedOwner);

        return true;
    }


    function completeOwnershipTransfer() public returns (bool) {
        require(msg.sender == proposedOwner);

        owner = proposedOwner;
        proposedOwner = address(0);

        OwnershipTransferCompleted(owner);

        return true;
    }
}

contract SimpleTokenConfig {

    string  public constant TOKEN_SYMBOL   = "ST";
    string  public constant TOKEN_NAME     = "Simple Token";
    uint8   public constant TOKEN_DECIMALS = 18;

    uint256 public constant DECIMALSFACTOR = 10**uint256(TOKEN_DECIMALS);
    uint256 public constant TOKENS_MAX     = 800000000 * DECIMALSFACTOR;
}

contract ERC20Interface {

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    function name() public view returns (string);
    function symbol() public view returns (string);
    function decimals() public view returns (uint8);
    function totalSupply() public view returns (uint256);

    function balanceOf(address _owner) public view returns (uint256 balance);
    function allowance(address _owner, address _spender) public view returns (uint256 remaining);

    function transfer(address _to, uint256 _value) public returns (bool success);
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
    function approve(address _spender, uint256 _value) public returns (bool success);
}

//
// Standard ERC20 implementation, with ownership.
//
contract ERC20Token is ERC20Interface, Owned {

    using SafeMath for uint256;

    string  private tokenName;
    string  private tokenSymbol;
    uint8   private tokenDecimals;
    uint256 internal tokenTotalSupply;

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


    function ERC20Token(string _symbol, string _name, uint8 _decimals, uint256 _totalSupply) public
        Owned()
    {
        tokenSymbol      = _symbol;
        tokenName        = _name;
        tokenDecimals    = _decimals;
        tokenTotalSupply = _totalSupply;
        balances[owner]  = _totalSupply;

        // According to the ERC20 standard, a token contract which creates new tokens should trigger
        // a Transfer event and transfers of 0 values must also fire the event.
        Transfer(0x0, owner, _totalSupply);
    }


    function name() public view returns (string) {
        return tokenName;
    }


    function symbol() public view returns (string) {
        return tokenSymbol;
    }


    function decimals() public view returns (uint8) {
        return tokenDecimals;
    }


    function totalSupply() public view returns (uint256) {
        return tokenTotalSupply;
    }


    function balanceOf(address _owner) public view returns (uint256) {
        return balances[_owner];
    }


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


    function transfer(address _to, uint256 _value) public returns (bool success) {
        // According to the EIP20 spec, "transfers of 0 values MUST be treated as normal
        // transfers and fire the Transfer event".
        // Also, should throw if not enough balance. This is taken care of by SafeMath.
        balances[msg.sender] = balances[msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);

        Transfer(msg.sender, _to, _value);

        return true;
    }


    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        balances[_from] = balances[_from].sub(_value);
        allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
        balances[_to] = balances[_to].add(_value);

        Transfer(_from, _to, _value);

        return true;
    }


    function approve(address _spender, uint256 _value) public returns (bool success) {

        allowed[msg.sender][_spender] = _value;

        Approval(msg.sender, _spender, _value);

        return true;
    }

}



//
// Implements a more advanced ownership and permission model based on owner,
// admin and ops per Simple Token key management specification.
//
contract OpsManaged is Owned {

    address public opsAddress;
    address public adminAddress;

    event AdminAddressChanged(address indexed _newAddress);
    event OpsAddressChanged(address indexed _newAddress);


    function OpsManaged() public
        Owned()
    {
    }


    modifier onlyAdmin() {
        require(isAdmin(msg.sender));
        _;
    }


    modifier onlyAdminOrOps() {
        require(isAdmin(msg.sender) || isOps(msg.sender));
        _;
    }


    modifier onlyOwnerOrAdmin() {
        require(isOwner(msg.sender) || isAdmin(msg.sender));
        _;
    }


    modifier onlyOps() {
        require(isOps(msg.sender));
        _;
    }


    function isAdmin(address _address) internal view returns (bool) {
        return (adminAddress != address(0) && _address == adminAddress);
    }


    function isOps(address _address) internal view returns (bool) {
        return (opsAddress != address(0) && _address == opsAddress);
    }


    function isOwnerOrOps(address _address) internal view returns (bool) {
        return (isOwner(_address) || isOps(_address));
    }


    // Owner and Admin can change the admin address. Address can also be set to 0 to 'disable' it.
    function setAdminAddress(address _adminAddress) external onlyOwnerOrAdmin returns (bool) {
        require(_adminAddress != owner);
        require(_adminAddress != address(this));
        require(!isOps(_adminAddress));

        adminAddress = _adminAddress;

        AdminAddressChanged(_adminAddress);

        return true;
    }


    // Owner and Admin can change the operations address. Address can also be set to 0 to 'disable' it.
    function setOpsAddress(address _opsAddress) external onlyOwnerOrAdmin returns (bool) {
        require(_opsAddress != owner);
        require(_opsAddress != address(this));
        require(!isAdmin(_opsAddress));

        opsAddress = _opsAddress;

        OpsAddressChanged(_opsAddress);

        return true;
    }
}


//
// SimpleToken is a standard ERC20 token with some additional functionality:
// - It has a concept of finalize
// - Before finalize, nobody can transfer tokens except:
//     - Owner and operations can transfer tokens
//     - Anybody can send back tokens to owner
// - After finalize, no restrictions on token transfers
//

//
// Permissions, according to the ST key management specification.
//
//                                    Owner    Admin   Ops
// transfer (before finalize)           x               x
// transferForm (before finalize)       x               x
// finalize                                      x
//

contract SimpleToken is ERC20Token, OpsManaged, SimpleTokenConfig {

    bool public finalized;


    // Events
    event Burnt(address indexed _from, uint256 _amount);
    event Finalized();


    function SimpleToken() public
        ERC20Token(TOKEN_SYMBOL, TOKEN_NAME, TOKEN_DECIMALS, TOKENS_MAX)
        OpsManaged()
    {
        finalized = false;
    }


    // Implementation of the standard transfer method that takes into account the finalize flag.
    function transfer(address _to, uint256 _value) public returns (bool success) {
        checkTransferAllowed(msg.sender, _to);

        return super.transfer(_to, _value);
    }


    // Implementation of the standard transferFrom method that takes into account the finalize flag.
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        checkTransferAllowed(msg.sender, _to);

        return super.transferFrom(_from, _to, _value);
    }


    function checkTransferAllowed(address _sender, address _to) private view {
        if (finalized) {
            // Everybody should be ok to transfer once the token is finalized.
            return;
        }

        // Owner and Ops are allowed to transfer tokens before the sale is finalized.
        // This allows the tokens to move from the TokenSale contract to a beneficiary.
        // We also allow someone to send tokens back to the owner. This is useful among other
        // cases, for the Trustee to transfer unlocked tokens back to the owner (reclaimTokens).
        require(isOwnerOrOps(_sender) || _to == owner);
    }

    // Implement a burn function to permit msg.sender to reduce its balance
    // which also reduces tokenTotalSupply
    function burn(uint256 _value) public returns (bool success) {
        require(_value <= balances[msg.sender]);

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

        Burnt(msg.sender, _value);

        return true;
    }


    // Finalize method marks the point where token transfers are finally allowed for everybody.
    function finalize() external onlyAdmin returns (bool success) {
        require(!finalized);

        finalized = true;

        Finalized();

        return true;
    }
}

Contract Security Audit

Contract ABI

API
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me":"OwnershipTransferInitiated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"_newOwner","type":"address"}],"name":"OwnershipTransferCompleted","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://2834b25310e165b028c7358691ec1bfc91fb5d3d4a55ea9b470bf23ac34d26d9

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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.