Apa yang harus kita bangun dengan blockchain?

 pragma solidity ^0.4.23; library SafeMath { /** * @dev Multiplies two numbers, throws on overflow. **/ function mul(uint256 a, uint256 b) internal pure returns (uint256 c) { if (a == 0) { return 0; } 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 /** * @title SafeMath * @dev Math operations with safety checks that throw on error */ // uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return a / b; } /** * @dev Subtracts two numbers, throws on overflow (ie 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 c) { c = a + b; assert(c >= a); return c; } } /** * @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. **/ constructor() 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)); emit OwnershipTransferred(owner, newOwner); owner = newOwner; } } /** * @title ERC20Basic interface * @dev Basic ERC20 interface **/ 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); } /** * @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); } /** * @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]); balances[msg.sender] = balances[msg.sender].sub(_value); balances[_to] = balances[_to].add(_value); emit 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) { return balances[_owner]; } } 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); emit 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; emit 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); emit 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); } emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]); return true; } } /** * @title Configurable * @dev Configurable varriables of the contract **/ contract Configurable { uint256 public constant cap = 1000000000*10**18; uint256 public constant basePrice = 100*10**18; // tokens per 1 ether uint256 public tokensSold = 0; uint256 public constant tokenReserve = 500000000*10**18; uint256 public remainingTokens = 0; } /** * @title CrowdsaleToken * @dev Contract to preform crowd sale with token **/ contract CrowdsaleToken is StandardToken, Configurable, Ownable { /** * @dev enum of current crowd sale state **/ enum Stages { none, icoStart, icoEnd } Stages currentStage; /** * @dev constructor of CrowdsaleToken **/ constructor() public { currentStage = Stages.none; balances[owner] = balances[owner].add(tokenReserve); totalSupply_ = totalSupply_.add(tokenReserve); remainingTokens = cap; emit Transfer(address(this), owner, tokenReserve); } /** * @dev fallback function to send ether to for Crowd sale **/ function () public payable { require(currentStage == Stages.icoStart); require(msg.value > 0); require(remainingTokens > 0); uint256 weiAmount = msg.value; // Calculate tokens to sell uint256 tokens = weiAmount.mul(basePrice).div(1 ether); uint256 returnWei = 0; if(tokensSold.add(tokens) > cap){ uint256 newTokens = cap.sub(tokensSold); uint256 newWei = newTokens.div(basePrice).mul(1 ether); returnWei = weiAmount.sub(newWei); weiAmount = newWei; tokens = newTokens; } tokensSold = tokensSold.add(tokens); // Increment raised amount remainingTokens = cap.sub(tokensSold); if(returnWei > 0){ msg.sender.transfer(returnWei); emit Transfer(address(this), msg.sender, returnWei); } balances[msg.sender] = balances[msg.sender].add(tokens); emit Transfer(address(this), msg.sender, tokens); totalSupply_ = totalSupply_.add(tokens); owner.transfer(weiAmount);// Send money to owner } /** * @dev startIco starts the public ICO **/ function startIco() public onlyOwner { require(currentStage != Stages.icoEnd); currentStage = Stages.icoStart; } /** * @dev endIco closes down the ICO **/ function endIco() internal { currentStage = Stages.icoEnd; // Transfer any remaining tokens if(remainingTokens > 0) balances[owner] = balances[owner].add(remainingTokens); // transfer any remaining ETH balance in the contract to the owner owner.transfer(address(this).balance); } /** * @dev finalizeIco closes down the ICO and sets needed varriables **/ function finalizeIco() public onlyOwner { require(currentStage != Stages.icoEnd); endIco(); } } /** * @title LavevelToken * @dev Contract to create the Lavevel Token **/ contract AlexToken is CrowdsaleToken { string public constant name = "AlexToken"; string public constant symbol = "ALT"; uint32 public constant decimals = 18; } 

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