xd4rker

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xd4rker

pragma solidity ^0.4.21;

contract GuessTheNewNumberChallenge {
    function GuessTheNewNumberChallenge() public payable {
        require(msg.value == 1 ether);
    }

    function isComplete() public view returns (bool) {
        return address(this).balance == 0;
    }

xd4rker

web3.eth.getBlock('latest', function(e, r) {
  var data = {number: r.number, hash: r.hash, timestamp: r.timestamp };
  var sha3 = web3.sha3([data.hash.slice(2), (data.timestamp + 14).toString(16).padStart(64, "0")].join(''), {encoding: 'hex'});
  data.answer = parseInt(sha3.slice(-2), 16);
  contractInstance.guess(data.answer, {value: 1000000000000000000}, function(x, v) { })
});

xd4rker

pragma solidity ^0.4.21;

contract GuessTheNewNumberChallenge {
    function GuessTheNewNumberChallenge() public payable {
        require(msg.value == 1 ether);
    }

    function isComplete() public view returns (bool) {
        return address(this).balance == 0;
    }

xd4rker

var data = {};
web3.eth.getBlock(3045393, function(err, res) { 
  data.parentHash = res.parentHash;
  data.timestamp = res.timestamp;
  var answerHash = web3.sha3([res.parentHash.slice(2), res.timestamp.toString(16).padStart(64, "0")].join(''), {encoding: 'hex'})
  data.answer = parseInt(answerHash.slice(-2), 16);
  console.log(data);
});

xd4rker

pragma solidity ^0.4.21;

contract GuessTheRandomNumberChallenge {
    uint8 answer;

    function GuessTheRandomNumberChallenge() public payable {
        require(msg.value == 1 ether);
        answer = uint8(keccak256(block.blockhash(block.number - 1), now));
    }

xd4rker

var answerHash = '0xdb81b4d58595fbbbb592d3661a34cdca14d7ab379441400cbfa1b78bc447c365';
for(var i=0; i<2000; i++) {
	if(web3.sha3(i.toString(16), {encoding: 'hex'}) == answerHash) {
		console.log('Answer Found: ' + i);
		break;
	}
}

xd4rker

pragma solidity ^0.4.21;

contract Crack {
    uint8 public answer;
    bytes32 answerHash = 0xdb81b4d58595fbbbb592d3661a34cdca14d7ab379441400cbfa1b78bc447c365;

    function Crack() public {
        for(uint8 i = 0; i <= 2000; i++) {
            if(keccak256(i) == answerHash) {
                answer = i;

xd4rker

pragma solidity ^0.4.21;

contract GuessTheSecretNumberChallenge {
    bytes32 answerHash = 0xdb81b4d58595fbbbb592d3661a34cdca14d7ab379441400cbfa1b78bc447c365;

    function GuessTheSecretNumberChallenge() public payable {
        require(msg.value == 1 ether);
    }
    
    function isComplete() public view returns (bool) {

xd4rker

var abi = [{"constant":false,"inputs":[{"name":"n","type":"uint8"}],"name":"guess","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[],"name":"isComplete","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"inputs":[],"payable":true,"stateMutability":"payable","type":"constructor"}];
var contract = web3.eth.contract(abi);
var contractInstance = contract.at('0xeD108ab8e7436fAa61b55591262abE1FD2C2E4Cb');
contractInstance.guess(42, {value: 1000000000000000000}, function(err, res) { });