LefterisJP

"The Cyber" Challenge

On 23/03/18 in the evening I got a PGP encrypted email with an invitation to a challenge involving two ethereum smart contracts called "The Cyber". I was intrigued and spent a bit of time solving the "GateKeeper" puzzles to enter the challenge. Now I would like to share it with whomever else wants to try solving it.

Below is the original message I got -- minus the passphrases.

Original Message

Hello

You have been formally invited to join theCyber, a decentralized club on the Ethereum blockchain. The contract (thecyber.eth | 0x97A99C819544AD0617F48379840941eFbe1bfAE1) is straightforward by design and deliberately avoids equity memberships, dues, contract ownership or migration, and voting or other governance. Rather, theCyber is intended to operate as a testbed that its members can use to communicate, attend events, and collaborate.

oleurud

# pull the official mongo docker container
docker pull mongo

# create network
docker network create my-mongo-cluster

# create mongos
docker run -d --net my-mongo-cluster -p 27017:27017 --name mongo1 mongo mongod --replSet my-mongo-set --port 27017
docker run -d --net my-mongo-cluster -p 27018:27018 --name mongo2 mongo mongod --replSet my-mongo-set --port 27018
docker run -d --net my-mongo-cluster -p 27019:27019 --name mongo3 mongo mongod --replSet my-mongo-set --port 27019

pubkey

#run all via:
# wget -O - https://gist.githubusercontent.com/pubkey/27083b667698b8d7b32bbcb0d413f78b/raw/6a2a75097112f1c4d25800cf03c7de025663fd17/new_linux.bash | bash



apt-get update
apt-get upgrade -y
apt-get dist-upgrade -y

# choo choo!

alexvandesande

contract random {
    /* Generates a random number from 0 to 100 based on the last block hash */
    function randomGen(uint seed) constant returns (uint randomNumber) {
        return(uint(sha3(block.blockhash(block.number-1), seed ))%100);
    }

    /* generates a number from 0 to 2^n based on the last n blocks */
    function multiBlockRandomGen(uint seed, uint size) constant returns (uint randomNumber) {
        uint n = 0;
        for (uint i = 0; i < size; i++){

alexis89x

/**
 @class BroadcastChannel
 A simple BroadcastChannel polyfill that works with all major browsers.
 Please refer to the official MDN documentation of the Broadcast Channel API.
 @see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API">Broadcast Channel API on MDN</a>
 @author Alessandro Piana
 @version 0.0.6
 */

/*

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

rxaviers

People

:bowtie:	😄 :smile:	😆 :laughing:
😊 :blush:	😃 :smiley:	☺️ :relaxed:
😏 :smirk:	😍 :heart_eyes:	😘 :kissing_heart:
😚 :kissing_closed_eyes:	😳 :flushed:	😌 :relieved:
😆 :satisfied:	😁 :grin:	😉 :wink:
😜 :stuck_out_tongue_winking_eye:	😝 :stuck_out_tongue_closed_eyes:	😀 :grinning:
😗 :kissing:	😙 :kissing_smiling_eyes:	😛 :stuck_out_tongue:

ryoppy

/**
 * Parse query string.
 * ?a=b&c=d to {a: b, c: d}
 * @param {String} (option) queryString
 * @return {Object} query params
 */
getQueryParams: function(queryString) {
  var query = (queryString || window.location.search).substring(1); // delete ?
  if (!query) {
    return false;