Latest 25 from a total of 2,913 transactions
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Approve | 21682620 | 24 days ago | IN | 0 ETH | 0.0004747 | ||||
Transfer | 21592981 | 37 days ago | IN | 0 ETH | 0.00031703 | ||||
Transfer | 21430615 | 60 days ago | IN | 0 ETH | 0.0012516 | ||||
Approve | 21359599 | 69 days ago | IN | 0 ETH | 0.00054124 | ||||
Approve | 21338602 | 72 days ago | IN | 0 ETH | 0.00172395 | ||||
Transfer | 21338587 | 72 days ago | IN | 0 ETH | 0.0019034 | ||||
Transfer | 21338514 | 72 days ago | IN | 0 ETH | 0.0016689 | ||||
Transfer | 21331252 | 73 days ago | IN | 0 ETH | 0.00100462 | ||||
Approve | 21326750 | 74 days ago | IN | 0 ETH | 0.00071466 | ||||
Transfer | 21326747 | 74 days ago | IN | 0 ETH | 0.00088247 | ||||
Transfer | 21326731 | 74 days ago | IN | 0 ETH | 0.00082983 | ||||
Approve | 21303807 | 77 days ago | IN | 0 ETH | 0.0006834 | ||||
Transfer | 21303804 | 77 days ago | IN | 0 ETH | 0.00069211 | ||||
Approve | 21292322 | 79 days ago | IN | 0 ETH | 0.00041478 | ||||
Transfer | 21292316 | 79 days ago | IN | 0 ETH | 0.00041243 | ||||
Approve | 21147787 | 99 days ago | IN | 0 ETH | 0.00023406 | ||||
Transfer | 21145709 | 99 days ago | IN | 0 ETH | 0.00064358 | ||||
Approve | 21055471 | 112 days ago | IN | 0 ETH | 0.00015348 | ||||
Transfer | 21050056 | 113 days ago | IN | 0 ETH | 0.00026002 | ||||
Approve | 20995824 | 120 days ago | IN | 0 ETH | 0.00037021 | ||||
Approve | 20367322 | 208 days ago | IN | 0 ETH | 0.0002317 | ||||
Transfer | 20367314 | 208 days ago | IN | 0 ETH | 0.00018261 | ||||
Transfer | 20367304 | 208 days ago | IN | 0 ETH | 0.00024798 | ||||
Transfer | 20367248 | 208 days ago | IN | 0 ETH | 0.00011999 | ||||
Transfer | 20367243 | 208 days ago | IN | 0 ETH | 0.00008264 |
Latest 1 internal transaction
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5129469 | 2552 days ago | Contract Creation | 0 ETH |
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Contract Source Code Verified (Exact Match)
Contract Name:
SkillChainToken
Compiler Version
v0.4.19+commit.c4cbbb05
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-02-21 */ pragma solidity ^0.4.19; // File: contracts/ApproveAndCallFallBack.sol contract ApproveAndCallFallBack { function receiveApproval( address from, uint256 tokens, address token, bytes data) public; } // File: zeppelin-solidity/contracts/math/SafeMath.sol /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ library SafeMath { /** * @dev Multiplies two numbers, throws on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) { return 0; } uint256 c = a * b; assert(c / a == b); return c; } /** * @dev Integer division of two numbers, truncating the quotient. */ function div(uint256 a, uint256 b) internal pure 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; } /** * @dev Substracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } /** * @dev Adds two numbers, throws on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } } // File: zeppelin-solidity/contracts/token/ERC20/ERC20Basic.sol /** * @title ERC20Basic * @dev Simpler version of ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/179 */ contract ERC20Basic { function totalSupply() public view returns (uint256); function balanceOf(address who) public view returns (uint256); function transfer(address to, uint256 value) public returns (bool); event Transfer(address indexed from, address indexed to, uint256 value); } // File: zeppelin-solidity/contracts/token/ERC20/BasicToken.sol /** * @title Basic token * @dev Basic version of StandardToken, with no allowances. */ contract BasicToken is ERC20Basic { using SafeMath for uint256; mapping(address => uint256) balances; uint256 totalSupply_; /** * @dev total number of tokens in existence */ function totalSupply() public view returns (uint256) { return totalSupply_; } /** * @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)); require(_value <= balances[msg.sender]); // 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 view returns (uint256 balance) { return balances[_owner]; } } // File: zeppelin-solidity/contracts/token/ERC20/BurnableToken.sol /** * @title Burnable Token * @dev Token that can be irreversibly burned (destroyed). */ contract BurnableToken is BasicToken { event Burn(address indexed burner, uint256 value); /** * @dev Burns a specific amount of tokens. * @param _value The amount of token to be burned. */ function burn(uint256 _value) public { require(_value <= balances[msg.sender]); // no need to require value <= totalSupply, since that would imply the // sender's balance is greater than the totalSupply, which *should* be an assertion failure address burner = msg.sender; balances[burner] = balances[burner].sub(_value); totalSupply_ = totalSupply_.sub(_value); Burn(burner, _value); } } // File: zeppelin-solidity/contracts/token/ERC20/ERC20.sol /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public view 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); } // File: zeppelin-solidity/contracts/token/ERC20/DetailedERC20.sol contract DetailedERC20 is ERC20 { string public name; string public symbol; uint8 public decimals; function DetailedERC20(string _name, string _symbol, uint8 _decimals) public { name = _name; symbol = _symbol; decimals = _decimals; } } // File: zeppelin-solidity/contracts/ownership/Ownable.sol /** * @title Ownable * @dev The Ownable contract has an owner address, and provides basic authorization control * functions, this simplifies the implementation of "user permissions". */ 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() public { 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) public onlyOwner { require(newOwner != address(0)); OwnershipTransferred(owner, newOwner); owner = newOwner; } } // File: zeppelin-solidity/contracts/token/ERC20/StandardToken.sol /** * @title Standard ERC20 token * * @dev Implementation of the basic standard token. * @dev https://github.com/ethereum/EIPs/issues/20 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol */ contract StandardToken is ERC20, BasicToken { mapping (address => mapping (address => uint256)) internal 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)); require(_value <= balances[_from]); require(_value <= allowed[_from][msg.sender]); balances[_from] = balances[_from].sub(_value); balances[_to] = balances[_to].add(_value); allowed[_from][msg.sender] = allowed[_from][msg.sender].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 view returns (uint256) { return allowed[_owner][_spender]; } /** * @dev Increase the amount of tokens that an owner allowed to a 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 * @param _spender The address which will spend the funds. * @param _addedValue The amount of tokens to increase the allowance by. */ function increaseApproval(address _spender, uint _addedValue) public returns (bool) { allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue); Approval(msg.sender, _spender, allowed[msg.sender][_spender]); return true; } /** * @dev Decrease the amount of tokens that an owner allowed to a spender. * * approve should be called when allowed[_spender] == 0. To decrement * allowed value is better to use this function to avoid 2 calls (and wait until * the first transaction is mined) * From MonolithDAO Token.sol * @param _spender The address which will spend the funds. * @param _subtractedValue The amount of tokens to decrease the allowance by. */ function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) { 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; } } // File: zeppelin-solidity/contracts/token/ERC20/MintableToken.sol /** * @title Mintable token * @dev Simple ERC20 Token example, with mintable token creation * @dev Issue: * https://github.com/OpenZeppelin/zeppelin-solidity/issues/120 * Based on code by TokenMarketNet: https://github.com/TokenMarketNet/ico/blob/master/contracts/MintableToken.sol */ contract MintableToken is StandardToken, Ownable { event Mint(address indexed to, uint256 amount); event MintFinished(); bool public mintingFinished = false; modifier canMint() { require(!mintingFinished); _; } /** * @dev Function to mint tokens * @param _to The address that will receive the minted tokens. * @param _amount The amount of tokens to mint. * @return A boolean that indicates if the operation was successful. */ function mint(address _to, uint256 _amount) onlyOwner canMint public returns (bool) { totalSupply_ = totalSupply_.add(_amount); balances[_to] = balances[_to].add(_amount); Mint(_to, _amount); Transfer(address(0), _to, _amount); return true; } /** * @dev Function to stop minting new tokens. * @return True if the operation was successful. */ function finishMinting() onlyOwner canMint public returns (bool) { mintingFinished = true; MintFinished(); return true; } } // File: contracts/SkillChainToken.sol contract SkillChainToken is DetailedERC20, MintableToken, BurnableToken { modifier canTransfer() { require(mintingFinished); _; } function SkillChainToken() DetailedERC20("Skillchain", "SKI", 18) public {} function transfer(address _to, uint _value) canTransfer public returns (bool) { return super.transfer(_to, _value); } function transferFrom(address _from, address _to, uint _value) canTransfer public returns (bool) { return super.transferFrom(_from, _to, _value); } function approveAndCall(address _spender, uint256 _tokens, bytes _data) public returns (bool success) { approve(_spender, _tokens); ApproveAndCallFallBack(_spender).receiveApproval( msg.sender, _tokens, this, _data ); return true; } function transferAnyERC20Token(address _tokenAddress, uint256 _tokens) onlyOwner public returns (bool success) { return ERC20Basic(_tokenAddress).transfer(owner, _tokens); } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Deployed Bytecode
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Swarm Source
bzzr://60288ab3283834f86ffeb0db67eb578cd6a7f3d295ea0d997b4a3665de155522
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OVERVIEW
Skillchain is the ultimate protocol where universities, companies and training companies meet to certify and to guarantee the skills permanentlyMultichain Portfolio | 31 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | 100.00% | $0.00199 | 26,147.2731 | $52.04 |
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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.