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Cryptokitties Code

How To Code Your Own Cryptokitties-style Game Onethereum

How To Code Your Own Cryptokitties-style Game Onethereum

Co-founder at Loom Network. Building scalable blockchains for large-scale online games and social apps Creators of CryptoZombies.io How to Code Your Own CryptoKitties-Style Game onEthereum CryptoKitties has done a great job of demonstrating what blockchains can be used for beyond just simple financial transactions. Im hoping well start to see a lot more innovative uses of the blockchain for games like this in the future, so I wanted to write a quick walkthrough of the code behind CryptoKitties to show how it was implemented beneath the surface. This article is written for developers, and while its not an absolute-beginners introduction to Solidity, I tried to include links to documentation to make it as accessible as possible to developers of all levels. Almost all of the CryptoKitties code is open source, so the best way to figure out how it works is to read through the source code. Its around 2,000 lines total, so in this article Im going to be walking through only the sections I think are most important. But heres a copy of the full contract code on EthFiddle if you want to read through it on your own: Powered by EthFiddle, the #1 Solidity code-sharing siteethfiddle.com If youre not familiar with what CryptoKitties is, its basically a game for buying, selling, and breeding digital cats. Each cat has a unique appearance that is defined by its genes, and when you breed 2 cats together, their genes combine in a unique way to produce an offspring, which you can then breed or sell. The code for CryptoKitties is split into a number of smaller contracts in order to keep related code bundled together without having one single giant file with everything in it. The subcontract inheritance for the main kitty contract looks like this: contract KittyOwnership is KittyBase, ERC72 Continue reading >>

Dapp Development - How Does Cryptokitties Work With Smart Contracts And Is There A Random Element To It? - Ethereum Stack Exchange

Dapp Development - How Does Cryptokitties Work With Smart Contracts And Is There A Random Element To It? - Ethereum Stack Exchange

How does cryptokitties work with smart contracts and is there a random element to it? I'm totally new to cryptokitties, but my understanding of cryptokitties so far is: It's a smart contract that generates new kitties according to your ethereum address. If you are breeding kitties, how does it handle randomness to "breed" different attributes of kitties? Can we see how the kitties smart contract is made? Can the crypto kitties website run as a standalone app (dapp) to interact with the ethereum blockchain? A large chunk of the contract can be seen here: The breeding algorithm is "sooper-sekret" and is handled by a contract that implements GeneScienceInterface. As not-an-Ethereum-developer, I don't know where that contract lives. But @comodoro does! it's at 0xf97e0A5b616dfFC913e72455Fde9eA8bBe946a2B Presumably, the source isn't published and you'd have to reverse engineer how the pseudorandomness is implemented. Also presumably why people from the cryptokitties creators aren't allowed to own the cryptokitties (at least, I read that somewhere): they'd get all the fancy cats! Continue reading >>

Github - Cryptocopycats/awesome-cryptokitties: A Collection About Awesome Cryptokitties (yes, Cute Little Cartoon Cats) On The Blockchain! And Cryptocopycats - Digital Collectibles Secured On A Distributed Public Databases W/ Crypto Hashes. Are Cryptopuppies The New Cryptokitties? Learn By Example From The Real World (anno 2017) - Buy! Sell! Hodl! Sire!

Github - Cryptocopycats/awesome-cryptokitties: A Collection About Awesome Cryptokitties (yes, Cute Little Cartoon Cats) On The Blockchain! And Cryptocopycats - Digital Collectibles Secured On A Distributed Public Databases W/ Crypto Hashes. Are Cryptopuppies The New Cryptokitties? Learn By Example From The Real World (anno 2017) - Buy! Sell! Hodl! Sire!

CryptoKitties (Yes, Cute Little Cartoon Cats) on the Blockchain! Collect and breed digital cats. Start meow. Buy! Sell! Hold! Q: What's CryptoKitties? What's the big deal? CryptoKitties is centered around breedable, collectible, and oh-so-adorable creatureswe call CryptoKitties! Each cat is one-of-a-kind and 100% owned by you (*);it cannot be replicated, taken away, or destroyed. CryptoKitties is built on blockchain technology.You can buy, sell, or trade your CryptoKitty like it was a traditional collectible,secure in the knowledge that blockchain will track ownership securely.But, unlike traditional collectibles, you can breed two CryptoKittiesto create a brand-new, genetically unique offspring.It results in something specialjust like you! (*): See Q: Do you really own your CryptoKitties? A: Spoiler: No. Learn more @ cryptokitties.co ,medium: cryptokitties ,twitter: CryptoKitties ,reddit: CryptoKitties All I want for Christmas is a CryptoKitty. Reigning Cats -How to buy cryptocurrency Ethereum is it worth as much as Bitcoin and what are CryptoKitties? , The Sun, Dec/28 - Players can buy and sell virtual cats for as much as $10,000 on the new digital currency - with their rather valuable 'Cattributes' CryptoKitties, Explained ... Mostly , The New York Times, Dec/28 - Why are $20 million and 180,000 people suddenly in the market for digital cats? We gamified the blockchain. Note: For official (twice weekly) updates / timeline see updates.cryptokitties.co . 2017 Oct/19 - CryptoKitties alpha test starts at ETH Waterloo (in Ontario, Canada) - an Ethereum hackathon; hundreds of users bred thousands of cats 2017 Nov/22 - CryptoKitties contract scripts uploaded onto the public Ethereum blockchain 2017 Nov/23 - CryptoKitties closed beta starts; one of the top three most active Continue reading >>

The Big Business Of Cryptokitties Is Being Automated

The Big Business Of Cryptokitties Is Being Automated

The Big Business of CryptoKitties Is Being Automated Great, now digital kitten mills are a thing. The most popular use of Ethereum right now isnt startup fundraising or anything even remotely useful. Instead, people are sucking up Ethereums resources to breed and trade digital cats called CryptoKitties. Theyre basically Beanie Babies, except they dont physically exist, and so far the Ethereum community has collectively spent over $2 million USD on them. With so much money on the line, some CryptoKitty players are coding tools to automate parts of their digital kitten mills, mostly with apps that scan for high-value kitties. At least one tool on GitHub, an online repository for open source code, purports to be a trading bot. Organic CryptoKitty traffic is already clogging up the entire Ethereum network , and the specter of bots has made some manual users understandably frustrated . Read More: 11% of Traffic on the Ethereum Blockchain Is Being Used to Breed Digital Cats CryptoKitties is an app by Canadian startup Axiom Zen, and it was introduced to the world at an Ethereum hackathon at the University of Waterloo in October. The game works like this: the CryptoKitty code continually generates new, basic cats (called gen0 kitties), which the community then breeds and trades. Breeding two kitties involves sending some ether, Ethereums in-house cryptocurrency, to smart contracts that use the two base values to create a new one: a brand new kitty! Its all on the blockchain, in public view, which means that every CryptoKitty is provably unique. Some kitties have sold for as much as $75,000 USD . One Reddit user, who posted that they (manually) buy cheap gen0 cats just to breed and sell, told me in a private message that they are considering canceling a vacation to the Grand Ca Continue reading >>

Cryptokitties: The Tech Behind Thecraze

Cryptokitties: The Tech Behind Thecraze

Kitties have officially taken over the blockchain. Several articles have been written about the kitty phenomena and they have received significant mainstream exposure as well. In fact, even Vitalik Buterin has gotten in on the act! So, just to give you a very brief idea , cryptokitties is one of the first games that has been created on the blockchain. The idea is to breed, collect and hold digital kitties. The game was made by Vancouver based blockchain company Axiom Zen . Like I have said before, there have been many articles written on the topic and that you can checkout. In this article, we are going to look under the hood. We are going to see the nuts and bolts that powers this whole system. Also I want to aPAWlogise in advance for all the cat puns (it has begun already hasnt it?). Genetic algorithm is an optimisation technique used to solve non-linear optimisation problems. It works pretty much the way biological genetics works. It starts with an initial generation of candidate solutions that have been tests against the objective function. The algorithm then generates subsequent solutions from these parent solutions using bio-inspired operators like: selection, crossover, and mutation. While the genes inside our body consists of proteins and various other elements, in GA they are represented via numbers. So lets take a look at how evolution works using genetic algorithm. We will only be using binary cases i.e. cases where the genes can be represented as 1s and 0s. Selection: Selection basically means retaining the best performing parents from one generation to the next. These well-performing parents are the ones that are preferred for reproduction. So eg. the two parents chosen via selection are: Cryptokitties uses the Genetic Algorithm to create a new kitty. It u Continue reading >>

Cryptokitties Boom Proves Theres Money To Be Made In Decentralized Apps

Cryptokitties Boom Proves Theres Money To Be Made In Decentralized Apps

You may have heard about it if not, nows your chance CryptoKitties is taking the Ethereum world by the storm. Like that is the case with regular, centralized internet, decentralized internet some would argue is also getting all about cats, though not cat videos, at least not for the moment. As Im writing this, more than $10 million has been spent on cute digital cats through CryptoKitties , which obviously deserves our attention. CryptoKitties is the Ethereum-based digital kitten collectibles game, with each digital kitten representing a unique crypto asset and the ownership of it cannot be altered, as it is integrated onto the Ethereum blockchain. Anyone within the Ethereum network can purchase and then sell (for ether) breedable cartoon kittens, with the underlying technology (blockchain) preventing the alteration of ownership or production of fraudulent kittens. This in turn provides value to the kittens as collectibles with scarcity and rarity. Like that is still the case with most cryptocurrencies, there is no intrinsic value behind digital kittens. That, however, hasnt stopped the global cryptocurrency community from embracing the platform to get these cartoon kitties, quite the contrary. The future is exciting. And we believe that Blockchain is the future but Blockchain is about as approachable as a bunch of ones and zeroes, the CryptoKitties team said. We want a future for everyone, not one exclusive to Bitcoin miners, VCs, ICOs, and other equally fun acronyms. Five of the rarest digital kittens on the CryptoKitties platform were sold for over $100,000 each, and yes we gotta wonder whats the reason for anyone spending such money on a digital asset which is not a currency, no matter how cute it may be. But again, that hasnt stopped CryptoKitties from becoming th Continue reading >>

Cryptokitties Broke Ethereum. Heres Why They Would Thrive On Enjincoin

Cryptokitties Broke Ethereum. Heres Why They Would Thrive On Enjincoin

Gaming Network & Smart Cryptocurrency for Gaming CryptoKitties Broke Ethereum. Heres Why They Would Thrive on EnjinCoin CryptoKitties have clogged the network. Enjin Coins original architecture is designed to solve thisproblem. Unfortunately, Ethereum platform is having a bit of trouble with handling CryptoKitties. The game accounts for more than 10% of the activity on Ethereum blockchain, the network is clogged, and the team behind the game had to resort to increasing the gas price in order to keep the game stable. Enjin Coin was mentioned on VentureBeat as a project that aims to fix this and take gaming to the next level, so we felt a need to explain how we solved this problem. The Enjin Coin platform is optimized for low gas fees and fast response in modern video games, and would allow building rich games like CryptoKitties without the associated network problems. Contract storage is the most costly operation that can be performed on Ethereum. Enjin Coins philosophy is to have a rich client and minimal blockchain. Games using Enjin Coin items will not suffer from high gas fees, because all the metadata for items is handled by the games themselves. The blockchain only needs to maintain the smallest necessary amount of data needed to validate a players ownership. We were the first to pioneer the concept of a monolithic token contract , and this idea is now being used in games like CryptoKitties and their proposal for an ERC-721 standard. In our design , all tokens are stored in a single smart contract, which drastically reduces the fees associated with deploying new tokens. Almost every ERC-20 token on Ethereum today is bloating the blockchain and making it more expensive to use, because up to 99% of token code is redundant. Our innovative solution was to re-use all s Continue reading >>

What Cryptokitties Can Teach Us About The Success Of Blockchain

What Cryptokitties Can Teach Us About The Success Of Blockchain

What CryptoKitties can teach us about the success of blockchain As someone who has been struggling with kitten addiction for many years, I was immediately attracted to the idea behind the CryptoKitties virtual feline collectibles game the first game to utilize Ethereum blockchain. CryptoKitties and I are, it seems, an ideal match. Ill admit Im far from an expert in cryptocurrencies and am often skeptical of the current crypto-fever, so I cannot focus intensely on thetechnological aspect of the phenomenon. Its the cultural aspect of the CryptoKitty craze that Im interested in, and here I will present a few key insights that I consider central to the viral success and notoriety of this particular blockchain project. When CryptoKitties emerged in late 2017, no one expected their massive popularity and success. After all, who could have predicted that a digital pet could end up selling for the equivalent of $113,000? Lets take a look at how this came to be. CryptoKitties is an Ethereum-based game, which means that each and every transaction in the game is logged and stored in the Ethereum blockchain. In a sense, CryptoKitties are a form of blockchain collectibles, as each of them has a unique genetic code and traits some rarer, more desirable or more expensive than others. Are you getting Neopets flashbacks already? Well, the developers prefer the comparison to Beanie Babies, the late 90s fad that had people paying extreme amounts of cash for collectible stuffed animals. However, unlike other collectibles, CryptoKitties have the capacity to breed and produce offspring with new, unique characteristics and traits. I know, I know it kind of sounds like a digital Beanie Babies puppy mill. Us millennials are the strangest breed of all. If it also sounds like a pyramid scheme, w Continue reading >>

Scratch That: Cryptokitties Isn't Quite Ethereum's Vision For Apps - Coindesk

Scratch That: Cryptokitties Isn't Quite Ethereum's Vision For Apps - Coindesk

Scratch That: CryptoKitties Isn't Quite Ethereum's Vision for Apps Ethereum creator Vitalik Buterin cried himself to sleep the night "World of Warcraft" maker Blizzard Entertainment altered his "belovedwarlock's Siphon Life spell." According to Buterin, the online role-playing game forever changed his outlook toward app development."On that day, I realized what horrors centralized services can bring," he writes on his official "About.me." Aspiring to offer a "world computer," ethereum has sought to stop similar occurrences by providing a platform on which decentralized applications (dapps) can run. But while a whole slew of startups is developing ethereum solutions for everything from social media to file sharing, none have yet to see a large, mainstream audience. An internet-based game for buying, selling and breeding adorable digital kittens, CryptoKitties has found itself in the center of a pop culture storm. Many have lauded the app for giving new users an easy, fun way to learn about cryptocurrency protocols, but others are strongly opposed to the app, which has been the cause of serious backlogs and rising transaction fees on the network. But there's another issue with CryptoKitties that's being increasing called to attention: namely, your kitty isn't as decentralized as you think. As least, that's the contention of some critics , who claim CryptoKitties, like World of Warcraft before it, is under the control of a central authority. Widely heralded as an unprecedented success for ethereum, questions have now begun to emerge about whether it's at the sacrifice of the fundamental concept of the project. What's to stop the owner of the CryptoKitties smart contract, Kitty Core, from editing the algorithm and mutating a kitty against the will of its owner? According t Continue reading >>

Github - Dapperlabs/cryptokitties-bounty: Bounty Program For Cryptokitties Smart Contract

Github - Dapperlabs/cryptokitties-bounty: Bounty Program For Cryptokitties Smart Contract

The CryptoKitty Bounty Program is NOW CLOSED Thank you everyone for your participation!! Please stay tuned for rewards! CryptoKitty Bounty ProgramCryptoKitties recognizes the importance of security researchers in keeping our community safe and fun. With the launch of CryptoKitties around the corner, we would love the community to help provide disclosure of security vulnerabilities via our bounty program described below. What you Should Know About CryptoKitties: CryptoKitties is a game centered around breedable, collectible, and oh-so-adorable creatures we call CryptoKitties! Each cat is one-of-a-kind and 100% owned by you; it cannot be replicated, taken away, or destroyed. CryptoKitties are non-fungible tokens (see ERC #721 ) that are indivisible and unique. The smart contracts have over 4-billion variations of phenotypes (what you see) and genotypes (what you dont see). Because cats are tokens on a blockchain, they can be bought, sold, or transferred digitally, with strong guarantees of ownership. CryptoKitties is built on the Ethereum network; ether will be necessary to fuel transactions, which include purchasing, trading, and breeding CryptoKitties. For the purpose of this bounty program, the program will run within the Rinkeby test network. Also the source code will be available for review. Two CryptoKitties can breed a new CryptoKitty. Kitties do not have a permanently assigned gender. While they can only engage in one breeding session at one time, each Kitty is able to act as either matron or sire. The owner chooses per breeding interaction! This bounty program will run within the Rinkeby network from 12:01am GMT November 16th - 11:59pm GMT November 20th, 2017. All code important to this bounty program is publicly available within this repoHelp us identify bugs, Continue reading >>

People Have Spent Over $1m Buying Virtual Cats On The Ethereum Blockchain

People Have Spent Over $1m Buying Virtual Cats On The Ethereum Blockchain

People have spent over $1M buying virtual cats on the Ethereum blockchain Launched a few days ago, CryptoKitties is essentially like an digital version of Pokemon cards but based on the Ethereum blockchain.And like most viral sensations that catch on in the tech world, its blowing up fast. Built by Vancouver and San Francisco-based design studio AxiomZen , the game is the latest fad in the world of cryptocurrency and probably soon tech in general. People are spending a crazy amount of real money on the game. So far about $1.3M has been transacted , with multiple kittens selling for ~50 ETH (around $23,000) and the genesis kitten being sold for a record ~246 ETH (around $113,000). This third party site tracks the largest purchases made to date on the game. And like any good viral sensation prices are rising and fluctuating fast. Right now it will cost you about .03 ETH, or $12 to buy the least expensive kitten in the game. So now we have people using Ether, an asset with arguably little tangible utility to purchase an asset with unarguably zero tangible utility. Welcome to the internet in 2017. In all seriousness, its a little bit reminiscent of the beanie baby trend where people were paying insane amounts of money for stuffed animals. But if the popularity continues to increase these people may be able to make a return by reselling or breeding their rare kittens, or theyll be stuck holding the virtual cryptographic keys to a virtual rare kitten when the market crashes in a few day, like eventually happened with beanie babies. There are a few cool things about the game though, and putting aside the valuation absurdity its actually a cool way for beginners to interact with the Ethereum blockchain. First off, its important to understand that since its played on the Ethere Continue reading >>

Ethereum Accounts, Address And Contracts

Ethereum Accounts, Address And Contracts

pragma solidity ^0.4.11;/** * @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; /** * @dev The Ownable constructor sets the original `owner` of the contract to the sender * account. */ function Ownable() { 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) onlyOwner { if (newOwner != address(0)) { owner = newOwner; } }}/// @title Interface for contracts conforming to ERC-721: Non-Fungible Tokens/// @author Dieter Shirley < [emailprotected] > (ERC721 { // Required methods function totalSupply() public view returns (uint256 total); function balanceOf(address _owner) public view returns (uint256 balance); function ownerOf(uint256 _tokenId) external view returns (address owner); function approve(address _to, uint256 _tokenId) external; function transfer(address _to, uint256 _tokenId) external; function transferFrom(address _from, address _to, uint256 _tokenId) external; // Events event Transfer(address from, address to, uint256 tokenId); event Approval(address owner, address approved, uint256 tokenId); // Optional // function name() public view returns (string name); // function symbol() public view returns (string symbol); // function tokensOfOwner(address _owner) external view returns (uint256[] tokenIds); // function tokenMetadata(uint256 _tokenId, string _preferredTransport) public view returns (string infoUrl); // ERC- Continue reading >>

Hacking The Cryptokitties Genome

Hacking The Cryptokitties Genome

My friend Anshul recently told me about CryptoKitties. I had heard about it clogging up the ETH pipes and causing the price to drop but had not realized what an amazing design the CryptoKitties team had realized. CryptoKitties are basically breed-able beanie babies built on top of the ethereum blockchain. And yet, they are also so much more than that: CryptoKitties are a digital playground where programmers, geneticists, and experts in economics, bioinformatics, machine learning and game theory can come together to learn and play. For those of you new to CryptoKitties, have a look at the Mashable guide ; this will teach you the basics of the CryptoKitties game system. To get a better view of exactly just what a kitty is you can go through the CryptokittiesCore contract . Youll find that a CryptoKitty is basically a struct on the EVM that looks like this. function isGeneScience() public pure returns (bool); /// @dev given genes of kitten 1 & 2, return a genetic combination - may have a random factor /// @return the genes that are supposed to be passed down the child function mixGenes(uint256 genes1, uint256 genes2, uint256 targetBlock) public returns (uint256); Wow a secret. This is THE secret. If youve been playing cryptokitties you know this is how kitties are produced. Youll notice that siring kitties produces offspring in a manner that feels intuitive: features get passed on from parents to offspring sometimes but not always, sometimes skipping generations. This is the code that runs at the conception of cryptokitties with non-zero generations. A brief genetics remedial from your 10th grade biology class A phenotype (from Greek phainein, meaning to show , and typos, meaning type) is the composite of an organism s observable characteristics or traits , such as its mo Continue reading >>

Learn What Are Cryptokitties? The Most Comprehensive Guide Written

Learn What Are Cryptokitties? The Most Comprehensive Guide Written

Learn What Are Cryptokitties? The Most Comprehensive Guide Written What Are Cryptokitties? Crash Course.Over the last year or so DAPPs aka Decentralised Applications have slowly gained a lot of steam. As you are probably aware of, a DAPP is not owned by any central organization and it represents a much-needed paradigm shift in an increasingly centralized world. However, for DAPPs to get the proper mainstream exposure they deserve, one of them had to break through and make it big. (Yes technically speaking Bitcoin is a DAPP as well, but we are not talking about store-of-value here). Sure, there have been several DAPPs before which got some exposure but something had to make it big and capture the publics imagination. Cryptokitties is a blockchain-based virtual game that allows players to adopt, raise, and trade virtual cats. The game was made by Vancouver based blockchain company Axiom Zen. However, what is truly important to remember is that this is the first known application of DAPP for leisure and recreation. Sales of Cryptokitties have been through the roof. People have spent more than twelve million dollars buying these cryptokitties. There are even reports of people who have made more money trading cyptokitties than investing in their IRA! Lets look at how many sales have been made per day: Several articles have been written about the kitty phenomena and they have received significant mainstream exposure as well. In fact, even Vitalik has gotten in on the act! Each kitty has its own unique 256-bit unique genome code. Which is carried down to all its descendent kitties via the use of Genetic Algorithm. The genetic algorithm is an optimization technique used to solve nonlinear optimization problems. It works pretty much the way biological genetics works. It starts Continue reading >>

Cryptozombies - Learn To Code Games On Ethereum. Powered By Loom Network

Cryptozombies - Learn To Code Games On Ethereum. Powered By Loom Network

CryptoZombies is a free, interactive code school that teaches you to build games on Ethereum. The course is designed for beginners to Solidity and starts off with the absolute basics. So if you've never coded with Solidity before, don't worry we'll walk you through step by step. In-browser step-by-step lessons take you from the very basics of Solidity to creating your own fully-functional blockchain-based game. Even by the end of Lesson 1 (which can be completed in one sitting), you'll know enough to officially call yourself a Solidity developer! In Lesson 1, you will build a Zombie Factory to build your army. Every Zombie you create will have randomly generated DNA and have his own unique appearance. Further lessons (1 released each week) will add more functionality to your game, like the ability to battle other people's zombies! Earn crypto-collectible Zombies and bonuses by completing coding lessons. After completing all lessons and deploying your DApp, pit your zombie army against other players' zombies in one of the world's first blockchain-based games! Half code-school, half MMO crypto-collectible strategy game. What are you waiting for? Click the button below to dive into lesson 1 and build your first DApp. It's free! Who Made CryptoZombies and Why Is It Free? Loom Network . We're building a platform for running large-scale applications on Ethereum sidechains. We think blockchains are capable of a lot more than just payments, and we want to get more developers thinking outside the box and trying to build large-scale DApps. Games are one of the areas where we think blockchain will really revolutionize things. So we built CryptoZombies to help educate and inspire the next generation of blockchain game devs. Aside from CryptoZombies, we're working on some really co Continue reading >>

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