Ethereum Crypto-Games: Mechanics, Prevalence and Gambling Similarities

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Ethereum Crypto-Games: Mechanics, Prevalence and Gambling Similarities See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/335202888 Ethereum Crypto-Games : Mechanics, Prevalence and Gambling Similarities Conference Paper · October 2019 DOI: 10.1145/3311350.3347178 CITATIONS READS 6 1,512 6 authors, including: Oliver J. Scholten Nathan GJ Hughes The University of York The University of York 10 PUBLICATIONS 7 CITATIONS 2 PUBLICATIONS 6 CITATIONS SEE PROFILE SEE PROFILE Sebastian Deterding Anders Drachen The University of York The University of York 88 PUBLICATIONS 9,049 CITATIONS 177 PUBLICATIONS 3,241 CITATIONS SEE PROFILE SEE PROFILE Some of the authors of this publication are also working on these related projects: Games User Research and Game Analytics View project PAnDA Architecture View project All content following this page was uploaded by Nathan GJ Hughes on 28 October 2019. The user has requested enhancement of the downloaded file. Paper Session 6: Broader Reflections CHI PLAY'19, October 22–25, 2019, Barcelona, Spain Ethereum Crypto-Games: Mechanics, Prevalence and Gambling Similarities Oliver James Scholten Nathan Gerard Jayy Hughes Sebastian Deterding University of York University of York University of York York, UK York, UK York, UK [email protected] [email protected] [email protected] Anders Drachen James Alfred Walker David Zendle University of York University of York York St. John University York, UK York, UK York, UK [email protected] [email protected] [email protected] ABSTRACT of real-money gaming [26] and, due to their chance-based Ethereum crypto-games are a booming and relatively unex- mechanics, of the recent convergence of gaming and gam- plored area of the games industry. While there is no consensus bling [12,20]. Similar phenomena, like loot boxes, or gacha definition yet, ‘crypto-games’ commonly denotes games that games, have drawn the attention of regulators, whose con- store tokens, e.g. in-game items, on a distributed ledger atop cerns regard whether they pose risks similar to gambling and a cryptocurrency network. This enables the trading of game therefore require similar regulation [22]. Interestingly, this items for cryptocurrency, which can then be exchanged for discussion has not yet reached crypto-games. regular currency. Together with their chance-based mechanics, Examples of crypto-games include CryptoKitties and Gods Un- this makes crypto-games part of the recent convergence of chained, whose gameplay involves using these virtual goods digital gaming and gambling. In a first effort to scope the to complete in-game objectives. They are growing in player field, this paper surveys popular crypto-games, which use the popularity, with CryptoKitties generating over £26 million in Ethereum cryptocurrency, to tease out characteristic technical sales since its creation in the last two years1. Perhaps more properties and gameplay. It then compares the games’ features importantly, crypto-games draw enormous attention in the with criteria found in current legal and psychological defini- games industry, with events like the Crypto Games Confer- tions of gambling. We find that the popular crypto-games ence attracting 1,500 delegates in 2019 2. In March 2019, the selected meet a combined legal and psychological definition blockchain gaming startup Forte announced an investment of of gambling, and conclude with ramifications for future re- US$100 million to fund blockchain game development 3. search. Despite the growing player popularity and industry interest CCS Concepts in crypto-games, research on them has been limited. In this •Applied computing ! Electronic data interchange; paper, we therefore provide an overview of current crypto- games, drawing on a sample of popular games on the Ethereum Author Keywords cryptocurrency. We begin by introducing distributed ledgers, Distributed ledger; Ethereum; crypto-games; gambling; blockchains, and cryptocurrencies, discussing some advan- regulation; blockchain gaming tages and trade-offs of such decentralised architectures for games, followed by the contested distinction between gaming INTRODUCTION and gambling with respect to the underlying technology of Crypto-games are video games with a fully or partially dis- crypto-games. We then describe the gameplay and mechanics tributed ledger architecture that operate atop a cryptocurrency of current crypto-games. Finally, we compare crypto-games network, giving players provable ownership over the virtual to psychological and legal definitions of gambling to assess to goods they contain. This also allows players to exchange what extent they warrant deeper scrutiny by player researchers virtual goods for cryptocurrency, which in turn can be ex- and legal scholars. This will also assist designers in the de- changed into real currency. Crypto-games are thus an instance Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are 1See developer website: https://www.dapperlabs.com/, accessed not made or distributed for profit or commercial advantage and that copies 05/07/2019. bear this notice and the full citation on the first page. Copyrights for third- 2 https://cryptogames.events party components of this work must be honored. For all other uses, contact See event page: , accessed 05/07/2019. the Owner/Author. 3 CHI PLAY ’19, October 22-25, 2019, Barcelona, Spain See https://venturebeat.com/2019/03/12/forte-and-ripple- Copyright ©2019 is held by the owner/author(s). form-100-million-fund-for-mainstream-blockchain-games, ACM ISBN 978-1-4503-6688-5/19/10. accessed 05/07/2019. https://doi.org/10.1145/3311350.3347178 379 Paper Session 6: Broader Reflections CHI PLAY'19, October 22–25, 2019, Barcelona, Spain Term Definition Distributed ledger A system for recording and synchronising data across multiple identical copies at separate sites Blockchain One implementation of distributed ledgers storing records in a sequence of linked blocks Blockchain gaming Umbrella term for the use of distributed ledger technologies in digital games and gambling Cryptocurrency A decentralised digital currency using a distributed ledger to record and prove ownership Crypto-game A game whose in-game tokens are stored on a distributed ledger atop a cryptocurrency network DApp A decentralised application with code and data stored on a distributed ledger Digital wallet An alphanumeric key pair used to verify transactions on cryptocurrency networks Ether (ETH) The token used to ‘purchase’ compute power on the Ethereum network Ethereum A popular cryptocurrency network that can support DApps Ethereum crypto-game A crypto-game running as a DApp on the Ethereum cryptocurrency network Gacha game A game where players purchase ‘lucky draws’ to acquire virtual items of different rarities [22] iGaming Short hand for internet gambling e.g. online poker, roulette, etc. Loot Box Items in video games purchased with real-money which contain randomised contents [36]. Standard game Any game not using distributed ledger technologies, for example Hearthstone, Fortnite, etc. Table 1. Definitions of terms used throughout this paper. velopment of crypto-games that don’t replicate gambling ser- ensure that none of the previously recorded blocks have be vices. tampered with. While there are many use cases for distributed ledgers, the BACKGROUND most well-known application are cryptocurrencies, digital cur- rencies that use a cryptographically secured distributed ledger Distributed Ledger Technologies like a blockchain [24]. Like distributed ledger technology In broadest terms, the technology underlying crypto-games are more generally, cryptocurrencies have seen several waves of distributed ledgers. Distributed ledgers are identical copies of interest in recent years [17], with a combined market capital- files recording transactions that are stored across several sites isation of over US$130 billion as of March 22, 20194. This and kept aligned through a consensus mechanism [3]. Take a value is especially noteworthy given state limitations on the network game where players can trade virtual gold for virtual exchange of cryptocurrencies into real currencies, with some swords. The ownership of any virtual item must be recorded nation states outright banning their exchange [19]. Although somewhere to ensure persistence of the item within the game. Bitcoin, the ‘flag bearer’ of cryptocurrencies, frequently ex- Traditionally, game provider C may store this information on periences large fluctuations in price, the overall market of their own central game server. When player A sells a sword to cryptocurrencies has grown approximately 620% in the last 3 player B in-game, this triggers a request from player A’s client years4. Bitcoin popularised the consensus mechanism of proof computer to game provider C’s server to update the sword’s of work: to earn the right to add a new transaction to the block ownership entry in its database. Game provider C’s server chain, as part of the transaction entry, nodes have to solve database here is a central ledger - a single authoritative record complicated mathematical puzzles that take a lot of comput- of transactions. While central ledgers can be efficient, they ing time to solve but are again quick to verify. This prevents also constitute a single point of failure, and they require every people from spamming the distributed ledger with entries. In player to trust the entity controlling them. If a network glitch Bitcoin and many other cryptocurrencies,
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