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REVIEW article

Front. Blockchain, 09 October 2023
Sec. Blockchain for Good

Decentralized justice: state of the art, recurring criticisms and next-generation research topics

Updated
  • 1Kleros Cooperative, Paris, France
  • 2Pantheon-Assas University, Paris, France
  • 3The University of Hong Kong, Hong Kong SAR, China

Decentralized justice is a novel approach to online dispute resolution based on blockchain, crowdsourcing and game theory for adjudicating claims in a neutral and efficient way. Since the launch of the first decentralized justice platform in 2018, the field has attracted wide interest both from practitioners and academics in Web3 and dispute resolution. The decentralized justice approach is based on the ideas of decentralization, economic incentives and a claim to fairness in its decisions. At the current stage of development, decentralized justice is facing a number of technical, market, legal and ethical challenges for further development. This paper provides a review of the short history of decentralized justice, addresses a number of recurrent topics and lays down a path for future exploration.

1 Introduction

The world economy is evolving at an accelerating rate towards globalization and digitization (Friedman, 2006). The early internet age gave us near-zero communication costs; now, cryptocurrencies are enabling near-zero transaction costs. The result is a drastic transformation in the economic activity and the types of disputes that will arise. We are rapidly transitioning towards a world with a new breed of disputes; those taking place in online communities involving anonymous or pseudonymous agents hailing from different legal jurisdictions (Koh, 2021; Hewitt, 2021; Guillaume and Riva, 2022; Cappiello, 2022).

A claim over a software development contract, a broken undertaking in a crowdfunding campaign, or an accusation of cheating in an e-sports tournament are just some of the new types of disputes that are becoming widespread. This situation is a completely different scenario from the multi-million dollar disputes involving conglomerates and governments for which the framework of the New York Convention was established in 1958 (United Nations, 1958).

The aforementioned new breed of disputes is generating increased interest in the development of new dispute resolution methods to resolve them. Some proposals have come from the world of traditional litigation (Russell and Susskind, 2013), while others are coming from the world of e-commerce or alternative dispute resolution (ADR), seeking to leverage new technologies such as machine learning in an attempt to increase the efficiency of the process (Schmitz and Rule, 2017). Due to their decentralized nature, one of the components of which is smart contracts (IBM, 2023), public blockchains cannot be regulated by a centralized on-chain authority in the same way as state justice or traditional arbitration require the use of coercion to enforce rulings. These limitations, imposed by the technical characteristics of public blockchains, call for the search for solutions that can combine decentralization with the autonomy of smart contracts.

One of these emerging dispute resolution frameworks, dubbed decentralized justice, leverages blockchain technology, cryptography and game theory in order to produce a resolution method which is fast, efficient and transnational (Allen et al., 2019; Llerena, 2019; Suzuki, 2020).

This article will review the early theoretical research and empirical experience in the field of decentralized justice and will study the applicable challenges, objections and recurring criticisms. It will also propose a number of new avenues to explore in order to further develop this nascent field in dispute resolution.

Following this introduction, the paper is structured as follows:

Section 2 unravels the mechanics of decentralized justice systems, spotlighting Kleros as a representative case study.

Section 3 navigates the technical challenges in designing these systems so that they are robust and resistant to effects such as bribery and collusion.

Section 4 delves into the market challenges, identifying use cases where these systems can solve business problems efficiently and fairly.

Section 5 dissects the legal and public policy challenges, examining issues from jurisdiction to enforcement of awards.

Section 6 grapples with the moral challenges, exploring the friction between these systems and traditional understandings of fairness.

Finally, Section 7 concludes the paper, reflecting on the potential of decentralized justice systems amidst the significant challenges they must surmount, and suggesting potential areas for future multidisciplinary research in the fields of social science such as of law, economics as well as social choice theory.

Throughout this paper, the Kleros protocol will be utilized as the primary source of examples. This stated emphasis is a reflection of the practical realities of decentralized justice systems. At the time of writing, the Kleros protocol has a completed caseload exceeding 1,500 disputes, while other protocols have not reached a fraction of this number. As Kleros is the most active platform, the insights derived from this examination will be valuable for the broader field, as they provide a basis for understanding and anticipating the evolution of other emerging decentralized justice platforms, which have been comparatively assessed elsewhere (Aouidef et al., 2021). In contrast to Kleros, similar projects such as Aragon (2021) and Jur (Palombo and Battaglini, 2021), which are no longer actively maintained, have not achieved a comparable caseload, as evident at the time of writing. Consequently, the insights gained from this examination of Kleros’ extensive caseload can offer valuable perspectives on the development and future trajectories of these defunct decentralized justice platforms, augmenting the broader understanding of their evolution within the field.

As the field continues to evolve, it is expected that other platforms will gain traction and warrant similar analysis. This study on Kleros thus serves as a foundational reference point for future investigations in the realm of decentralized justice, employing analytical methods of analysis by drawing on fields of economics, social choice theory, game theory, public policy, and law to contribute to the discussion.

2 What is decentralized justice

The emerging Web3 economy brings a number of new possibilities for users to engage with financial and commercial transactions (Nava González and Morales Rocha, 2021). For example, let’s imagine that Alice has hired Bob to produce a promotional video for her company. They agree on the terms of the contract (expected quality, length, etc.) and Bob starts to work. A few weeks later, he delivers the product, but Alice is not satisfied with the quality and claims that Bob did not follow her specifications. Bob claims that he did exactly what was agreed in the contract.

Smart contracts are unable to resolve this situation, as the code cannot evaluate whether the delivered video complies with the agreed aesthetic and functional specifications (Ghodoosi, 2021; Allen and Hunn, 2022). Contracts in general are incomplete in the sense that they cannot foresee all of the potential for disagreement that could arise, thus necessitating a dispute resolution system (Yépez Idrovo et al., 2020).

The decentralized justice concept was first proposed by Lesaege and Ast (2018) and further developed by Nappert and Ast (2020). Those early ideas built on previous research on the use of Schelling Point (Schelling, 1980) based incentives in blockchain oracles proposed by Vitalik Buterin (Buterin, 2014), Paul Sztork (Sztorc, 2015) and Augur (Peterson et al., 2022). The Kleros protocol was the first to apply this logic of subjective oracle into dispute resolution, taking direct inspiration from the ancient Athenian People’s Courts (Blackwell, 2003; Ast, 2018c; Kumtepe, 2021).

Figure 1 contains a summary of how the dispute resolution flow works in the Kleros Protocol. Suppose Alice and Bob use a Kleros-connected smart contract. Alice sends cryptocurrency to the contract, held in escrow until Bob fulfills the contract. If a dispute arises, funds remain locked while crowdsourced jurors resolve it. Any Ethereum user can be a juror by depositing Pinakion (PNK) tokens into Kleros courts, which is essentially a platform that serves as a meeting point for jurors and disputing parties, and allows the creation of subcourts wherein disputes of a similar nature may be grouped together (Ober et al., 2019).

Figure 1
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Figure 1. A summary of the dispute resolution flow at Kleros.

Jurors are randomly chosen, with selection likelihood proportional to staked PNK. No demonstrated expertise or identity proof is required. Jurors review evidence and vote for the party they believe is right, incentivized to align with the majority. A carrot-and-stick approach is used: if the vote is unanimous, then all jurors receive arbitration fees; if it is a split decision, dissenting jurors are not paid arbitration fees and also lose their staked PNK, which is given to majority jurors along with the arbitration fees. A key premise in decentralized justice systems is that jurors who vote consistently with the majority experience, on average, a financial gain. Jurors who dissent from the majority, on average, experience an economic loss. Once voting ends, the party obtaining the majority of jury votes wins. In this case, if Bob prevails, he receives the escrowed funds, minus a small fee paid to the jurors.

The first comprehensive attempt for formalizing the definition of decentralized justice can be traced to Federico Ast and Bruno Deffains’ seminal article “When Online Dispute Resolution Meets Blockchain: The Birth of Decentralized Justice” (Ast and Deffains, 2021). In this paper, as is summarized in Figure 2, they defined decentralized justice as a dispute resolution system possessing three fundamental characteristics: a) A decentralized autonomous organization (DAO) structure, b) A mechanism design based on cryptoeconomics, and c) Generating a perception of fairness (Ast and Deffains, 2021).

Figure 2
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Figure 2. Features of decentralized justice.

2.1 DAO structure

Being built as a DAO architecture ensures that the dispute resolution process will be conducted exactly as programmed (Nabben, 2021). A key feature of DAOs is that the governance rights are directly in the hands of the community, and decision-making is member-led much like a cooperative or direct democracy government (Perdrisa, 2021). The immutability of the blockchain further bolsters this system by making evidence production, jury selection or any other element of the procedure tamper-proof. As a result, the system is able to provide credible neutrality (Buterin, 2020a) and can be trusted by all parties (Hadfield and Weingast, 2013; Ast and Deffains, 2021).

2.2 Cryptoeconomics-based mechanism design

Cryptoeconomics refers to the paradigm that combines the fields of cryptography, economics, computer science, and game theory to study and build decentralized systems running on incentive mechanisms (Berg et al., 2019). Contrary to traditional dispute resolution systems, decentralized justice does not rely on expectations of moral behavior of agents but on strict economic incentives calibrated by mechanism design.

Namely, agents in a decentralized justice system vote on outcomes, and depending on how they vote a collective outcome is determined and the agents are provided with financial rewards or penalties. More formally, we have the following elements:

• Voting - any mechanism by which agents provide information on the outcomes of the dispute that they find more or less appropriate. Voting can take a number of forms. For example, agents could choose between two possible outcomes, provide a ranking of a finite list of possible outcomes, or they could score each of several outcomes independently on a 1–10 scale.

• Voting system - a function that takes as inputs the agents’ votes and outputs a collective decision.

• Payoff system - a function that takes as inputs the agents’ votes and outputs an amount that each agent is rewarded or penalized.

Agents are not expected to act honestly (i.e., be neutral in their decisions) because of moral reasons (the way they are in traditional dispute resolution systems) but because these elements are chosen so that it is in their rational interest of the agents to act in such a way in order to optimize their economic gain (Buterin, 2014; Gudkov, 2020; Aouidef et al., 2021).

A key game theoretic principle that is used by existing decentralized justice systems is the Schelling Point (Schelling, 1980). Within the context of a dispute resolution mechanism that relies on the game theoretic incentives - agents are likely to produce an outcome that is most commonly labeled as “fair” while seeking their private economic interests based on their prediction of other agents’ behavior, without any assumptions of ethical propriety on the part of any agent.

This formulation ensures that users that behave honestly and ethically (whether disputing parties or jurors) will, on average, be rewarded economically by the payoff system whereas users that behave dishonestly or unethically will, on average, be penalized economically (Ast and Deffains, 2021). In this way, the cryptoeconomic-based mechanism design of a decentralized justice system ensures trustlessness, which means that no agent is required to put faith in the honesty or reliability of any other agent in order for the system to work effectively.

2.3 Generating perceptions of fairness

In order to be considered legitimate, any court system must produce decisions that can reasonably be described as “fair” by disputants and outside observers. Determining what is “fair” is a subjective, controversial philosophical endeavor, and it is not the purpose of this paper to delve into such debates (Fennell and McAdams, 2014), but it must be noted that Ast and Deffains state that decentralized justice systems such as Kleros can be deemed to be “fair” in accordance with some formal models of defining fairness, such as Daniel Dimov’s model of procedural fairness (Dimov, 2017; Ast and Deffains, 2021).

Ast and Deffains have proposed that, because of their innovative nature and drastically different approach to dispute resolution, decentralized justice systems face four types of challenges to gain adoption: technical, market, legal and moral (Ast and Deffains, 2021). Ast and Deffains raise a number of open questions related to how each category of challenges could be resolved; however, they propose only preliminary directions for how these questions could be answered and these challenges could be addressed.

This paper will be building upon the proposed theoretical framework of Ast and Deffains. Specifically, the core contribution of the current work will be to survey the research fields that offer insight into the questions posed by Ast and Deffains and to provide an in-depth analysis of the state of the art of research on each of the challenges they identify. Thus, this paper should serve as a foundation for further research on these questions.

The following sections will conduct a thorough review of the literature addressing the different challenges posed to the growth of decentralized justice, point to recurrent criticisms and propose a number of new paths for research. The choice of literature was formed based on the level of tangible development achieved within the decentralized ecosystem currently faces. Although there are many proposed projects and hypothesized solutions, few of them have actually materialized in a successful mechanism with significant adoption. The literature review is thus informed by prioritizing practice over theory. Figure 3 summarizes the four key challenges decentralized justice systems have to overcome in order to drive adoption.

Figure 3
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Figure 3. Adoption of decentralized justice systems depends on their ability to respond to technical, market, legal and moral challenges.

3 Technical challenges

Mechanisms based on incentivizing participants to generate a consensus outcome favored by the majority is similar to the approach of other blockchain oracles such as Augur (Peterson et al., 2015; Lesaege and George, 2018) and UMA (UMA, 2018; George, 2022b). However, the divergence becomes clear when considering the respective focus of these protocols. UMA, through its usage of ‘priceless’ financial contracts and a distinctive Data Verification Mechanism, primarily facilitates the creation of synthetic assets. These assets, designed to reflect real-world market values, are achieved without the need for on-chain price feeds, hence optimizing efficiency and reducing vulnerability to manipulation (UMA, 2023). On the other hand, Augur operates as a decentralized prediction market platform on the blockchain. It relies on its native token, REP, which participants stake on various outcomes of real-world events, thereby forming a basis for probabilistic predictions. The unique rules governing the resolution of disagreements within Augur, such as appealing and forking mechanisms, are not primarily designed for general dispute resolution but are rather tailored specifically to uphold the integrity of its prediction markets (Peterson et al., 2019).

Contrarily, decentralized justice systems like Kleros cater to a wider remit, handling a diverse array of disputes that go beyond strictly market-oriented data. Thus, while the operational efficacy of UMA and Augur aligns closely with financial and prediction markets respectively, decentralized justice systems tend to present a generalized infrastructure that accommodates a broader spectrum of subject matter and tends to facilitate coordinated decisions over more nuanced questions.” Hence, the appropriate mechanism design choices for a decentralized justice system will diverge somewhat from those of other blockchain oracles.

A basic requirement for decentralized justice systems is that they must be secure and attack-resistant without requiring central intervention. The following sections will detail a few attacks and security considerations that are of particular relevance for a decentralized justice system.

3.1 Resistance to attacks

In the framework of decentralized justice systems, there is no final decision-maker or trusted party that is capable of imposing out-of-game penalties on abusive participants or screening participants who have a vested interest in the cases under consideration. Thus, defenses to attacks need to be built into the design of the system. Two broad categories of attack include the corruption of voters and the obtaining of disproportionate voting weight by a subset of voters.

Corruption of voters includes malicious behavior such as paying bribes to the participants judging a case. Indeed, bribery is a possibility in any system or protocol that involves voting. A vast trove of economic literature has already considered the dynamics of bribing in various microeconomic models (Burguet et al., 2016). In the context of Schelling Point mechanisms, there is a special type of bribe that is especially relevant, known as the p + epsilon attack (Buterin, 2015). A p + epsilon attack is an attack that specifically targets Schelling Point-based systems; the attacker offers a bribe to participants if they vote for a malicious outcome contingent on said malicious outcome losing the vote. Hence, the attack attempts to warp the incentives of participants in such a way that the malicious outcome wins the vote and then the attacker does not have to actually pay out the bribes. Various design and parameter choices have an impact on the viability of such p + epsilon attacks (George and Lesaege, 2021). For instance, it can be seen that p + epsilon attacks against Schelling Point-based mechanisms that redistribute lost deposits from penalized participants to rewarded participants (and hence where the amount of a reward depends on the exact vote counts for each option) require substantially higher budgets and are more susceptible to counter-attack strategies than p + epsilon attacks against Schelling Point mechanisms that provide to all participants who vote with the majority a fixed reward that does not depend on the margin of victory of the winning option. As other variants of payoff structures giving rise to Schelling Point-based games are possible, it would be potentially interesting to expand upon this work by considering the resistance to p + epsilon attacks under different payoff structures.

The ability of attackers to obtain disproportionate voting weight is due to limitations on identity systems in blockchains (Kaur et al., 2021; Schneider, 2022). There is generally no reliable way to ensure that all jurors in a decentralized justice platform are distinct, identifiable individuals. Many blockchain platforms involving voting often accept that it is possible for individuals to obtain multiple votes, but they seek to make it costly to obtain additional votes (Peterson et al., 2015; Lesaege et al., 2021). Attacks where a specific entity or conglomerate nonetheless accepts these costs and attempts to obtain enough voting rights to subvert the process are sometimes referred to as 51% attacks (Castro and Liskov, 1999; Nakamoto, 2009; Sayeed and Marco-Gisbert, 2019; Buterin, 2020b; Kaur et al., 2021). One proposal to deal with this issue is the creation of a blockchain-native identity system. Here, the idea is that an individual should only be allowed to register on a list once, and duplicate registrations can be challenged and judged by a subjective oracle. This concerned list could then be used to limit jurors to a single vote per registered human (James, 2021a). A possible generalization of the approach to create blockchain-native identity systems could be based on “Soulbound Tokens”, namely, non-transferable tokens that can be used to represent “social” attributes of users (Weyl et al., 2022; Binance Academy, 2022). Then individuals can similarly submit themselves to lists reserved for participants that have some qualification or certain type of expertise, with a decentralized justice protocol itself being used to arbitrate disagreements about whether a given individual meets the required criteria (Weyl et al., 2022; George, 2022a).

A set of experiments were conducted on an early version of the Kleros platform to measure its resistance to various attacks, notably p + epsilon attacks (standard, non-p + epsilon) bribes, and 51% attacks (George, 2018; George and Lesaege, 2021). However, there remain many interesting questions for future empirical research on resistance of decentralized justice systems to such attacks, such as how this resistance varies over longer time scales or when considering juror pools of varying backgrounds and sizes.

3.2 Incentivizing participants

In order for decentralized justice to be secure, it must have a payoff structure that incentivizes jurors to exert effort in evaluating cases and a voting system that robustly aggregates the jurors’ responses into a collective answer. These choices are informed by an existing body of literature in several fields of economics. Specifically, the choice of payoff structure can draw ideas from the field of peer prediction (Prelec, 2004; Miller et al., 2005; Radanovic and Faltings, 2013; Kong, 2020; Liu et al., 2020), a field that generally considers how payoff functions that depend on how a given participant’s vote compares to that of the other participants can be used to incentivize participants to exert effort in performing tasks. Namely, a payoff function should disincentivize “lazy strategies” such as voting randomly or otherwise voting in a way that does not consider information from individual cases. The choice of voting system can draw ideas from the field of social choice theory, a field that has studied the degree to which voting systems can be designed that satisfy various desirable properties.

However, directly applying existing systems from the peer prediction and social choice theory literature can be subtle. The choices of voting and incentive systems have interconnected effects on the resistance of the system to the attacks that we considered in the previous section. For example, in a bribe attack, the bribes that an attacker will need to pay to rational (Camerer, 2003; Ballandies, 2022) participants to influence their votes will depend on the costs that the payoff structure imposes on participants who accept bribes, while how many votes need to be corrupted in order for the attacker to change the outcome will depend on how the votes are aggregated. Thus, the resistance of a decentralized justice system to such an attack depends on interactions between the payoff and the voting systems.

Moreover, reconciling the assumptions of many of the models from peer prediction with resistance to these attacks can be difficult. For example, as we saw above, it is generally possible for an attacker to expend resources to obtain multiple votes. Resistance to attacks that obtain disproportionate voting weight is attained to the degree that it is expensive to obtain enough votes to alter the results of a case. However, many peer prediction models have requirements that voters do not collude in order to function properly (Prelec, 2004; Miller et al., 2005; Radanovic and Faltings, 2013), and a participant with multiple votes can “self-collude” by strategically coordinating her votes.

A potentially interesting research approach is to try to adapt results in the existing peer prediction literature, relaxing assumptions of participant behavior (Jurca and Faltings, 2007; Goel et al., 2020; Cai et al., 2020) that better reflect the setting of decentralized justice.

Note that dispute situations often require neutral decision makers to decide between several, nuanced possible outcomes in non-binary decisions. However, research in social choice theory has shown that, under minimal hypotheses, voting systems that decide between three or more outcomes lead to pathological phenomena at least in some rare circumstances (Arrow, 1950; Gibbard, 1973; Satterthwaite, 1975; Moulin, 1988). Subsequent research in social choice theory has considered a wide variety of tradeoffs that one can make in the design of voting systems to minimize some pathologies at the expense of accepting others (Brandt et al., 2016). Similar effects are present in Schelling Point-based voting, so one must consider what tradeoffs are most appropriate in this setting (Lesaege et al., 2021). For example, in choosing a voting and incentive system pair one might seek to minimize the impact of adding or deleting “clone” outcomes, generalizing existing social choice theory notions of clone independence (Tideman, 1987), so that now both the vote aggregation process and payoffs are resistant to the inclusion of clone outcomes changing the result.

Thus, there are many interesting questions for future research concerning the appropriate choice of voting and payoff systems to appropriately incentivize participants and remain resistant to attacks, while also having natural, desirable properties such as minimizing the impact of clone outcomes.

3.3 Appropriately managing information

Finally, the use of blockchains poses questions around managing the flow of information in a decentralized justice system. It is challenging to handle private information on blockchains as enough information about each transaction must be known by miners and other nodes for them to validate the transaction (Huynh et al., 2019). This raises questions about how to avoid the voting records of arbitrators from becoming public and threatening their privacy. Commit-and-reveal schemes allow for votes to remain hidden during a voting round to avoid influencing arbitrators who have not yet voted (Eskandari et al., 2020). However, such schemes require that the votes be revealed during a subsequent step in order for the results to be calculated. Various blockchain projects have researched zero-knowledge proof protocols towards minimizing the data that must be included in the transactions published on the blockchain and verified by nodes, particularly in the domain of payments (Huynh et al., 2019). It is conceivably possible to apply similar tools in a decentralized justice system: for example, an arbitrator proves that she was drawn and that she has not already voted, without providing her address. Such a structure is similar to various e-voting schemes that have been considered (Groth, 2005; Murtaza et al., 2019). However, in order for juror incentives to be paid, a decentralized justice system would need to further have a system where jurors can issue zero-knowledge proofs that they are due some total amount of rewards from the system without having to provide which cases they voted in.

3.4 Summary of research directions to address technical challenges

In conclusion, technical challenges are about the ability of decentralized justice systems to become more secure, efficient, and versatile. Some of the questions to research in this area include:

- How can decentralized justice systems become more resistant to collusion, bribery, lazy voting and p + epsilon attacks while nonetheless being capable of deciding nuanced, non-binary cases?

- What other voting and incentive systems would be well-adapted to the requirements of decentralized justice? How might one develop on recent research in peer prediction towards designing mechanisms that have incentive compatibility properties even when one can only take assumptions on participant behavior that are realistic in the setting of decentralized justice, such as by assuming limits on participant collusion rather than its absence? Additionally, paralleling work in social choice theory, one asks what further properties are relevant for voting aggregation mechanisms in decentralized justice and what tradeoffs one must make between potentially conflicting desirable properties.

- What zero knowledge proof protocols are appropriate to better manage the flow of information in decentralized justice protocols? For example, how can one most efficiently obfuscate the link between how an arbitrator votes and the rewards or penalties she receives, so that arbitrators’ voting records cannot be reconstructed based on on-chain information?

Answers to these questions will come from research in game theory and social choice theory in order to define how to structure information flows between participants and decide which are the best voting systems to aggregate the decisions of agents into rulings.

4 Market challenges

Decentralized justice is a new industry within the field of dispute resolution. As such, a number of challenges arise regarding use cases, business models and its future evolution (Morgan et al., 2022). Research opportunities also exist in ascertaining the boundaries and linkages between decentralized justice systems and other methodologies such as traditional dispute resolution and artificial intelligence.

4.1 Use case taxonomy

Decentralized justice systems are flexible protocols that can be adapted to a wide range of use cases. A significant number of applications for decentralized justice have been proposed in the fields of intellectual property disputes (Kleros Online Conference Full Stream, 2020; Archila Valle, 2020), translation freelancing (James, 2020b), production traceability (Talbert-Goldstein, 2019), leasing contracts (Virues Carrera, 2021), online marketplaces (Yubiai Landing, 2019), crowdfunded financing (Ast, 2017a), online gaming (Malbašić, 2022), real world asset tokenization (Ast and Colby, 2021), decentralized finance compliance (Kung, 2022), social media moderation (Ast, 2021b; Ast, 2022; Granzier-Nakajima, 2022), insurance (James, 2021b; Ragosa, 2021b), DAO governance (Ast, 2020a; Ragosa, 2021a, 2021b), prediction markets (James, 2020a; Farrington, 2019) the metaverse (CyberArb Team, 2022; Mischon de Reya, 2022), and others (Ast, 2018a; Lau, 2019; Tineo, 2019; Ast, 2020c; Sharma, 2022; Kessler, 2022). The use of decentralized justice has also been suggested as a way to protect at least some basic property rights in the context of non-functional legal systems such as the case of Venezuela (Bergolla, 2020).

In the early days, industry participants had organized such use cases into three main categories: escrow, curation and oracle.

Escrow use cases are those where parties have a claim over some disputed value. It typically involves two parties having a dispute over the failure to perform some agreement and resorting to the decentralized justice system to settle the issue. Escrow use cases are typical in insurance claims (James, 2021b), freelance work (James, 2018), or bounty payments (Wagner, 2022).

Curation use cases include all those where the goal of the mechanism is to verify the compliance of some item with a number of criteria to be accepted into a list. The use of cryptoeconomics as a mean to organize information in a decentralized way is often dubbed as a “token-curated registry.” In the context of decentralized justice, token-curated registries are based on a “decentralized sheriff” mechanism where users can challenge non-compliant submissions and the final decision is made by a decentralized jury (Bergolla et al., 2021). Curation use cases have wide range of applications which include cryptoasset compliance (Ast, 2020b), online identity (Chow, 2022) and NFT certification (Ast, 2022).

Oracle use cases include those where the decentralized justice system is used to verify a disputed claim of “factual nature” which requires some external information gathering. In this case, the decentralized justice mechanism is used as the last resort of an escalation game where parties can place ever increasing bonds on which answer is the right one (Ast, 2019). Famous oracle-type cases involved a dispute over the number of COVID deaths in the United States (Famous Kleros Cases - Kleros, 2021) and about the winner of the 2020 United States presidential election. Other applications might include content moderation (Ast, 2021a; Granzier-Nakajima, 2022).

Even though the escrow, curation and oracle taxonomy was common in the early days of the industry, an argument can be made that it does not accurately represent the range of use cases for decentralized justice. It can be argued that all of the decentralized justice industry falls within the “subjective oracle” category as questions being asked to jurors act as an oracle for that specific question. Also, all cases handled in these platforms are a kind of escrow as parties at least have to make some deposit that they will recover (or not) depending on the ruling of the case.

Another potential way to categorize the use cases of decentralized justice could be by focusing on functionality. From this perspective, decentralized justice systems could be categorized in optimistic mechanisms (a curation-type case where a claim is considered true after a period without being challenged), price discovery (Linguo, 2020;Kleros Linguo Tutorial, 2022), assets custody (escrow) or sybil-resistance (Proof of Humanity). Yet another way to build the taxonomy is by focusing on product or market verticals. Decentralized justice can be categorized as governance mechanisms (supreme court as a service (Kleros, 2021), content moderation), finance infrastructure (decentralized finance, insurance, real world assets curation), e-commerce infrastructure (price discovery, escrow), the decentralized implementation of bounties for remote workers, and others.

Some interesting research opportunities might come from creating a more precise taxonomy for the emerging decentralized justice ecosystem.

4.2 Industry structure and evolution

Although the online dispute resolution (ODR) industry has been around for decades, most initial platforms failed to achieve success (Martinez, 2020). This lack of success may partly be explained by the failure to introduce a significant change over traditional methods for alternative dispute resolution, as most ODR proceedings imitated traditional processes, with the main difference being that parties met over the Internet instead of a hearing room (Ast, 2018b; Rule, 2020).

A core component of the digital revolution is the ability to enable new ways of organizing human effort in platforms based on collective intelligence and labor on demand. These ideas were at the core of innovative transportation systems such as Uber, restaurant rating systems such as Yelp and hotel systems like Airbnb. These companies innovated by putting crowdsourcing of drivers, restaurant critics and hosts at the heart of their business model (Williams and Tapscott, 2010).

Decentralized justice applies the logic of crowdsourcing into dispute resolution in combination with a DAO architecture. In this way, decentralized justice proposes an exponential improvement in resolution speed and cost while it enjoys credible neutrality guarantees for earning the trust of parties. In terms of theory of innovation, traditional ODR systems brought incremental innovation while decentralized justice can be seen as a disruptive innovation which changes the logic of the value creation (Surowieki, 2005; Goldman and Whitcomb, 2011; Christensen, 2013; Christensen et al., 2015).

Aouidef, Ast and Deffains (Aouidef et al., 2021) have studied decentralized justice systems from the perspective of digital platform economics (Banton, 2022). In their article, they argue that decentralized justice protocols are marketplaces connecting a supply and demand of crowdsourced arbitration services. As more cases come into the system (growing demand), the higher the incentive for jurors to join the network (because there is profit to be made by providing their adjudication services). A higher amount and variety of jurors increases the quality, speed and cost of arbitration which makes the protocol more attractive for customers. As more users join the demand side, more cases are available for jurors to resolve, which creates the incentive for more jurors to join the network. Figure 4 summarizes the dynamics of network effects in decentralized justice protocols.

Figure 4
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Figure 4. Decentralized justice platform network effects dynamics inspired by Collins (2019).

In the long run, decentralized justice systems have the potential to scale their services very fast to respond to a growing dispute resolution demand similarly to how ride sharing apps can increase the amount of drivers to adjust to a fast increase in ride demand. In addition, the fact that they are built on blockchain means that they are able to operate globally through jurisdictional boundaries thus accommodating to the global nature of many economic activities.

4.3 Inclusion in traditional dispute resolution systems

Decentralized justice systems are commonly framed as a contrast to “traditional” systems, both by proponents and opponents of the idea. On one extreme, they may be represented as a replacement for traditional systems. On a more moderate note, they may be discussed in the context of existing side-by-side with conventional centralized mechanisms each addressing a different subset of use cases. A third option is to have decentralized justice systems partially merged into traditional dispute resolution mechanisms to bolster the effectiveness of the latter.

A substantial number of legal disputes center around inherently subjective concepts and interpretations that do not have a reliable gauge for reference. For instance, several contracts utilize terms that are subjective by design. A tenancy contract may state that the tenant is exempted from paying for “reasonable” wear and tear, or a subcontractor may be expected to deliver a product of “adequate” quality. These terms are used because laying down comprehensive rules to cover every potential circumstance is impossible. However, the flexibility that such subjective provisions facilitate in interpretation also tends to spur a significant number of disputes. Ultimately, the parties are left with the task of convincing a judge or arbitrator why their personal interpretation of such terms is valid.

The use of decentralized justice systems may potentially serve as better reference points for interpretation than the arguments of disputing parties with their one-sided assessment of the situation. In such a situation, the judge or arbitrator would merely need to refer the interpretation of specific subjective terms to a decentralized jury in order to arrive at the most appropriate likely understanding of the term. Modern courts and tribunals are already experimenting with methods to harness the wisdom of the crowd through use of surveys and polls (Ben-Shahar and Strahilevitz, 2017). However, such instruments are susceptible to manipulation by disputing parties with a vested interest. “Neutral” reports commissioned by the judge may not also be methodologically sound, thereby leading to additional rounds of arguments by lawyers concerning statistical methods.

A decentralized jury of appropriate numerical critical mass in the concerned market may be able to capture consumer sentiments in a faster, cheaper, and more accurate manner than surveys and polls due to their reliance on the Schelling Point principle (Sharma, 2022). Such decentralized oracles could be utilized by tribunals to provide answers to deliberately subjective questions such as determining a “fair” price or evaluating whether all steps taken by a party are “reasonable” (Zorzetto, 2015). Such functionality may be able to replace surveys and other costly legal research tools during the negotiation or pre-dispute assessment stage. For instance, law firms, when drafting uncertain contracts in potentially controversial transactions, may not be entirely sure about how a specific contract clause, principle or standard would be interpreted by the market or by a jury.

The field of legal analytics seeks to draw insights from data in order to help lawyers make better informed decisions to build their legal strategies. The application of decentralized justice could be part of the legal analytics toolkit of the future. For example, by using this methodology to conduct “mock trials” in order to predict the ruling that would be reached by an actual tribunal. This use case could have practical applications going from the development of legal strategies to litigation funding decisions.

Generally speaking, there are abundant opportunities for research in the use of decentralized justice systems as a fact-finding or heuristic device in order to provide decision support to centralized tribunals, legal firms or even as support in mediation processes, including assessing the conditions under which this would work and potential pitfalls in execution (Dean and Ast, 2023).

4.4 Interactions with other dispute resolution technologies

Recent years have seen an acceleration in the interest of the use of technology in dispute resolution. In particular, new machine learning techniques combined with a massive availability of data to train models promise great transformations in ODR systems (Schmitz and Rule, 2018; Susskind, 2019; Liebman et al., 2020; Park, 2020; Lefkovitz, 2020; Vasdani, 2020). One of the situations that has gathered important attention is the possibility of using artificial intelligence to build “robo-lawyers” able to automate the dispute resolution process (Daso, 2022). If automation is likely to dominate a growing part of dispute resolution procedures, the argument goes, then what’s the need for decentralized justice? Not many studies have been conducted so far about the interactions between AI and decentralized justice. However, prima facie, there’s at least three reasons to believe that AI will probably not replace crowdsourcing methods in the foreseeable future.

First, automation is unlikely to resolve a wide number of cases, especially those where the ability to understand the context, intentionality and emotions of agents is important (Knight, 2017; Selbst and Powles, 2017). Second, whenever a party appeals a ruling made by an automated method, this is likely to trigger a new decision-making round with humans involved in order to ensure diverse approaches in resolution of the problem. Third, while robot-judges can be useful to clear judicial backlog, automation may be simply not socially acceptable for certain use cases (Yalcin et al., 2022). Figure 5 summarizes how decentralized justice systems could interact with artificial intelligence and with other dispute resolution technologies.

Figure 5
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Figure 5. Comparison of dispute resolution methods based on the dispute complexity.

4.5 Summary of research directions to address market challenges

In summary, much more research is needed to better understand the taxonomy of decentralized justice use cases, the topology of decentralized justice networks and the many opportunities for the application of decentralized justice as a component of broader dispute resolution processes. Some interesting areas for further research may include the following:

- What is the taxonomy of use cases for decentralized justice? Should this taxonomy be adapted to different industry, academic or regulatory requirements?

- Will the industry of decentralized justice follow the traditional “winner takes all” dynamic often observed in digital industries with strong network effects? In other words, will the industry consolidate in a winning decentralized justice platform or will there be different networks addressing different use cases? Which variables (economic efficiency, moral views, compliance requirements) could cause the industry to fragment into different networks?

- The increase of the size of the networks is likely to increase the efficiency of the dispute resolution conducted through decentralized justice systems. In the early days, as the network only has a small number of jurors, the resolution costs will tend to be high and only high value use cases will be viable. However, as network effects are reached, the cost per case is expected to decrease, enabling a wide variety of new small claim use cases. What is likely to be the limit of the efficiency gains? What will be the monetary threshold of the “minimum arbitrable case” to be addressed by decentralized justice platforms?

- Can decentralized justice systems produce correct rulings at a cost that is suitable to the large volume of small claims expected in the growing digital economy? What will be the use cases where decentralized justice is likely to gain wider adoption? What are the use cases where it is likely to lose to other alternative dispute resolution methods such as AI or conventional ODR? Can these technologies be combined into more robust resolution systems?

5 Legal challenges

The invention and adoption of any new technological process creates tension with the old order of the world, which existing laws and regulations are designed to maintain. Decentralized justice systems are no different. The following section highlights some of the most pertinent challenges that the traditional legal framework may pose to decentralized justice.

5.1 The regulatory approach towards decentralized dispute resolution?

Technology regulation is a hotbed of debate with several interests at play, spanning from the desire to maximize innovation, all the way to ensuring the protection of consumers and public goods. However, law and technology can influence each other, as both regulate the behavior of individuals (De Filippi and Hassan, 2016; Lingwall and Mogallapu, 2021).

Decentralized justice systems in particular are a source of controversy due to their lack of compliance with prevailing laws. Furthermore, commentators have expressed concerns about the design mechanisms of decentralized arbitration (Dylag and Smith, 2021; Schmitz and Rule, 2019; Low and Mik, 2020), including about the lack of centralized coordination over crowdsourced jurors potentially resulting in informational cascades by incentivizing alignment with the majority, about the lack of party autonomy over the dispute resolution procedure, and about the perceived supremacy of “common sense” over “law” by relying on crowdsourcing (Gudkov, 2020).

Decentralized justice systems may be considered a form of an alternative dispute resolution (ADR), as they are processes that facilitate the resolution of disputes outside of the formal court system (Mnookin, 1998). The closest traditional ADR (Greig, 2022) analogue for decentralized justice systems is arbitration (Mazhorina, 2019; Molina, 2020). However, unlike traditional arbitration, decentralized arbitration lacks a unified approach to regulation or myriad soft laws and guidance documents (CIArb, 2021).

Decentralized justice, also seems to contradict the main tenets of due process and impartiality on which arbitration has traditionally founded its claims to render fair decisions. For instance, since jurors are anonymous, there is no way to verify that they do not have a vested interest in the outcome of the case they are adjudicating.

Regulation of blockchain systems has been difficult because unlike centralized entities (e.g., corporations), hierarchies of control and responsibility cannot be easily identified (Hacker and Lianos, 2019). For instance, features of decentralized arbitration protocols such as the anonymity of parties, lack of state recognition of awards, and indeterminacy of jurisdiction may raise the difficulty of legality and accountability (Buchwald, 2020).

It could be argued that users of decentralized dispute resolution mechanisms would not need state court recognition of decentralized arbitration awards due to the self-enforcing nature of smart contracts (Sanabria, 2021). Although this claim could apply in some situations for some categories of users, decentralized arbitration could be viewed as a dispute resolution solution that may settle disputes involving both on and off-chain relationships, therefore requiring further investigation in accordance with the applicable state and international regulatory frameworks.

Perhaps future research about the regulation of decentralized arbitration mechanisms can be informed by contemporary cases where said mechanisms have interacted with national courts. Specifically, there was a tenancy dispute that took place in 2020 in Mexico, wherein the disputing parties appointed an arbitrator but expressly agreed that the arbitrator would refer resolution of this dispute, together with all relevant evidence and arguments, to the Kleros Protocol, following which the arbitrator would formalize the verdict into a formal arbitral award (Virues Carrera, 2021). Upon resolution of the dispute in accordance with this procedure, the winning party (the landlord in the tenancy agreement), filed a motion to enforce the award in a Mexican civil court. The court duly issued a 5 days notice for the award-debtor for an opportunity to resist enforcement. However, as the award-debtor did not exercise this option, the award was declared binding (Virues Carrera, 2021).

This precedent is noteworthy because it is the first recorded instance of a decentralized arbitration mechanism formally coming under the cognizance of a national court (Chevalier, 2022; Saha and Upadhyay, 2022). However, it must be noted that the concerned case involved parties that endorsed the use of Kleros to adjudicate the dispute, as the award-debtor did not exercise its right to object. It is impossible to predict whether the court would pass the same decision had either of the parties challenged the nature of the Kleros decision. It would therefore be premature to assume that decentralized arbitration mechanisms are recognised as a dispute resolution process, but it can at least be seen as a positive sign that a court did not react to a decentralized dispute resolution mechanism with outright hostility.

The United Kingdom serves as another example of a state’s eagerness to shift toward the implementation of decentralized technology in dispute resolution. In 2021, the United Kingdom Jurisdiction Taskforce of LawtechUK introduced the Digital Dispute Resolution Rules (UK Jurisdiction Taskforce, 2021) that are “designed to enable faster and more cost-effective resolutions to legal disputes relating to novel digital technology such as crypto assets, smart contracts, and blockchain applications, and foster confidence amongst businesses in the adoption of these technologies.” (Swallow, 2021) Said Rules also consider innovative design systems in dispute resolution, such as resolution through peer to peer voting systems (UK Jurisdiction Taskforce, 2021), anonymous jurors, and contemplate the potential of automatic dispute resolution processes that may use smart contracts and/or AI as legally binding. It is unknown if any parties as of yet have opted into these rules, but they align with the previously published “Legal statement on crypto assets and smart contracts” (UK Jurisdiction Taskforce, 2019) provided by United Kingdom Jurisdiction Taskforce in 2019 and conform to the “Smart legal contracts Advice to Government” (The Law Commission, 2021) issued by the Law Commission in 2021. The aforementioned documents may well lay a foundation for the perception of smart contract technology in the future and perhaps are already shaping its current compatibility with traditional common law systems.

On the date of writing this paper, there are no known instances of regulation that expressly disqualify decentralized justice systems as an acceptable tool for dispute resolution, on the contrary, it could be seen that projects like Kleros and Jur are mentioned in documents prepared by the United Kingdom Jurisdiction Taskforce (UK Jurisdiction Taskforce, 2021), which leaves promise for future court precedents and legislation that will be open to the idea of decentralized protocols as legitimate dispute resolution processes.

Of course, it must be remembered that what is acceptable in a specific context in one jurisdiction may not be acceptable in other jurisdictions or even acceptable within another context in the same jurisdiction. However, in the case of dispute resolution verdicts, there is also an additional layer of international law that may pose unique questions.

5.2 The interplay of decentralized justice with international award enforcement regimes

The Convention on the Recognition and Enforcement of Foreign Arbitral Awards of 10 June 1958 (the “New York Convention”) (United Nations, 1958) is considered the foundation of the modern arbitration framework, providing a set of guiding rules that facilitate the international enforcement of awards. However, despite being arguably the most successful international treaty, the text of the Convention still poses a source of controversy and debate. For instance, Jan Paulsson notes that the key words such as “may”, “shall”, “must” tend to cause problems in semantics when the Convention is translated to different languages (Paulsson, 1998).

Several commentators have speculated about the applicability of The New York Convention clauses to decentralized justice has been discussed by a number of practitioners (Galindo, 2020; Lowther, 2020; Chai, 2019), but there is no clarity on whether decentralized courts comply with the Convention. For instance, one commonly-cited problem relating to the recognition of decentralized arbitration awards is that the New York Convention applies to awards “made in the territory of a State other than the State where the recognition and enforcement of such awards are sought” (United Nations, 1958).

However, decentralized mechanisms are by definition dispersed around the world, with anonymous parties and jurors all operating in indeterminate locations. It is thus possible that the indeterminacy of state jurisdiction may formally exclude decentralized justice mechanisms from the application of the Convention’s regime. Furthermore, the verdicts of decentralized justice mechanisms may be rejected by courts on the basis that they fall under the enforcement exceptions permitted by Article V, such as the grounds that a party was unable to present his case or that the arbitration procedure does not conform to the laws of the country where the arbitration took place (United Nations, 1958).

However, the Convention is a brief legal document that bestows significant leeway to national courts in interpretation of its provisions. For instance, some jurisdictions adopt an approach that arbitration as a dispute resolution process is autonomous and “delocalized.” Courts that adopt this logic routinely enforce arbitration awards that have been set aside by courts of the seat of arbitration on the basis that the decisions of the latter have no bearing on whether the award should be enforced (Paris Court of Appeal, 1997). It may thus be useful to assess whether this same logic could be adapted to enforce decentralized arbitration awards, despite the indeterminacy of jurisdiction.

There are other potential enforcement regimes that may become relevant, too. For instance, in 2020, the Council of the European Union issued a series of conclusions that emphasize that “the use of digital technologies can also improve access to out-of-court/tribunal and alternative methods of dispute resolution while respecting the right to effective judicial protection in each individual case and the right to a fair trial, as well as access to information tools on rights and obligations for citizens, which can contribute to avoiding disputes” (Council Conclusions, 2020). In fact, with the increased adoption of decentralized justice systems, there may emerge a transnational body of norms in the form of dedicated rules, soft law documents, and perhaps even treaties that serve a similar function to the New York Convention. Tracing the potential trajectory for the evolution of such a framework may serve as a potent field of research. Figure 6 summarizes the key differences between decentralized justice systems and international arbitration.

Figure 6
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Figure 6. Differences between decentralized justice and international arbitration.

5.3 Decentralized justice in the context of public policy issues

A largely nebulous concept, public policy may be understood to reflect fundamental and sacrosanct economic, legal, moral, political, religious and social standards of every State that must be maintained at any cost (Lew, 1978). Courts may reject the legitimacy of an arbitration award if it violates principles of fair procedure, such as arbitrator impartiality, the right to a fair hearing, or the adherence to mutually agreed procedures and remedies (Madden et al., 2021). The public policy defense can be invoked when an award impacts non-contracting third parties (Sodzawiczny v McNally, 2021; Brekoulakis, 2005) or carries broader societal implications, such as disrupting antitrust regulation (Shell China Co. Ltd. v Huili Hohhot Co., Ltd, 2019). Furthermore, enforcement may be denied if the subject matter infringes upon the state’s jurisdiction, such as disputes entangled with criminal law, or if it compromises public order, morality, national security, or core constitutional values (Madden et al., 2021).

At the outset, it can be observed that the most obvious potential public policy hurdles of a decentralized arbitration mechanism will likely emerge from the basic design of the protocol, which contravenes many of the traditional expectations legal systems impose upon a private dispute resolution procedure. For instance, the Schelling Point design provides jurors with a vested financial interest in the outcome of the dispute, and parties can potentially be drawn as jurors in their own dispute using separate cryptocurrency wallets, thereby conflicting with standard notions of neutrality.

The argument that the parties consented to this procedure may not be convincing enough. For instance, the IBA Guidelines on Conflicts of Interest in International Arbitration state that arbitrators may not have a significant interest in the outcome of a case, and that no party may waive this requirement because it fundamentally destroys the nature of a neutral dispute resolution mechanism (López de Argumedo Piñeiro, 2022).

Moreover, national courts retain the authority to look into the conformity of arbitration awards with their public policy and mandatory rules of law even when the disputing parties mutually accept the binding nature of the award. This tendency of courts is known as the “second look doctrine” (Mconnaughay, 1999). Escrow-based enforcement therefore violates the spirit of the second look doctrine, as it circumvents the enforcement jurisdiction of courts.

Future legal research may require an investigation into avenues of reconciliation or reform to solve the tension between the traditional dominion of courts to ensure compliance with principles of public policy and the mechanics of decentralized protocols.

In order for decentralized systems to ensure seamless adoption, it may be desirable to provide them a layer of legal protection that takes the form of a “binding” effect, where courts will refuse to reopen a case that has been validly disposed of by a valid ADR mechanism. The mainstream adoption of decentralized dispute resolution protocols may well depend on legal recognition in certain cases, but this may not be necessary in every instance. There is thus scope for future research to define a “legal risk hierarchy” that would differentiate use cases that can easily adopt decentralized justice systems, those that would require legal adjustments, and those best left to state courts. Understanding this would enable a more tailored application of decentralized justice.

As decentralized justice systems mature in sophistication and adoption, we may see the emergence of norms and practices unique to said mechanisms. Even in its nascency, decentralized justice is witnessing the same jurisprudential deliberation that influenced judicial systems over centuries. For instance, cases on the Kleros courts have witnessed heated debates on the value of precedents, the purposes of preambles, and deciding between the letter and spirit of a norm (Juror 0xe86e3, 2021). In fact, some commentators have gone as far as to claim that decentralized justice systems will find themselves completely divorced from traditional legal norms, instead developing a lex cryptographia that will obviate the need to pay any deference to rules and practices in traditional legal systems (Chevalier, 2021). An interesting field of research would be to investigate to what extent such predictions of a lex cryptographia may hold valid in the present context.

5.4 Summary of research directions to address legal challenges

Legal challenges may possibly be the most pervasive hurdles that decentralized justice systems will face in their quest for adoption, as decentralization of dispute resolution contravenes principles that have traditionally been considered non-contestable across a multitude of legal systems for several centuries. There might be inadvertent friction even with other fields of emerging regulation, such as in the context of data protection. Some of the interesting areas for further research would include the following:

- What should the transnational structure of the regulation of decentralized justice systems look like, if desired?

- Under what conditions can a ruling by a decentralized justice system be binding upon sovereign courts? Could rulings be subject to judicial review? What type of regulatory changes would be necessary for decentralized justice to become more acceptable as a method for dispute resolution?

- What are the challenges posed by privacy and data protection concerns and how can these be addressed by decentralized justice systems? Are there any specific carve-outs that are applicable or will need to be made? Does addressing these concerns require reforms to the law or the underlying mechanisms?

- How do decentralized justice systems challenge our conceptions of procedural fairness? Is there scope for reform and reconciliation?

- Is the emergence of a lex cryptographia realistic or a fantasy? What would the content of this hypothetical lex cryptographia be?

6 Moral challenges

Decentralized justice systems may face challenges from social or moral norms that do not quite have the binding characteristic of formal laws. However, these norms may nonetheless exert a powerful influence over the adoption and status of decentralized justice systems. Moral challenges concern the ability of decentralized justice systems to be perceived as fair by users even in spite of their notable differences to traditional dispute resolution methods.

6.1 A hyper financialization of dispute resolution?

A significant branch of scholarship has been critical of the widespread use of “economic logics” in the organization of public life (Davies, 2016; Brown, 2015). According to this view, treating actors as “homo economicuses” does not capture the diverse types of human motivations; an excessive use of economic metrics to measure behavior inevitably captures only certain aspects of that behavior. Indeed, by focusing attention on types of behavior that can be captured by such metrics, institutions contribute to the erosion of people to express non-economic aspects of themselves. Hence, economic logic “transmogr[ifies] every human domain and endeavor, along with humans themselves, according to a specific image of the economic” (Brown, 2015). Note that such concerns are in the spirit of “Value-sensitive Design” which asserts that technology designers too often focus on functional requirements and should provide greater emphasis on the humanity of users of technology (Van Der Hoven and Manders-Huits, 2020).

Criticisms of economic logic are particularly spirited in scholarship discussing blockchain systems, not least considering their history of libertarian ideological motivations (Korhonen and Rantala, 2021) and the fact that many of the advantages offered by blockchains are intrinsically economic in the potential they offer to allow for a more flexible deployment of mechanism design (Davidson et al., 2016).

Even within the blockchain ecosystem, criticisms of the “homo economicus” model may be especially applicable to decentralized justice systems, for the most crucial feature that sets them apart from crowdsourced online platforms is the introduction of direct cryptoeconomic incentives to the performance of jurors. Traditionally, jurors are often expected to serve pursuant to their duty to society, and in some jurisdictions avoiding jury dutymay attract a penalty ranging from a fine to imprisonment (Ninth Judicial Circuit Court of Florida, 2021). Jurors are otherwise typically paid only modest amounts of money to offset some of their inconvenience (United States Courts, 2022).

Because jurors are deemed to be performing a social duty, they are entitled to certain protections in order to perform their tasks fearlessly. Chiefly, jurors are encouraged to vote their conscience and cannot be penalized for any decisions they make (Fully Informed Jury Association, 2022). Even the small number of crowdsourced online platforms that exist in the e-commerce space do not provide much in the way of financial incentives to jurors, who are largely unpaid volunteers (Kwok et al., 2021).

Nathan Schneider considers the implications of the “homo economicus” criticism on blockchain-based governance systems where such economic motivations may interfere with the formation of democratic practices (Schneider, 2022). Schneider further cites the current lack of widely useable blockchain-based systems that can verify the “identity and integrity of human users” as an obstacle to the adoption of governance systems based on non-economic logic (Schneider, 2022). Referring to the use of aforementioned economic rewards and penalties to incentivize Kleros jurors and the encouragement of jurors to unite purely through self-interest instead of following some civic duty, Schneider identifies Kleros as a system that is more economic in nature than its traditional dispute resolution method counterparts (Schneider, 2022).

Ultimately Schneider advocates for an increased role for non-economic structures in blockchain governance; he remarks that the way in which blockchain systems are increasingly adopting motifs from existing political and social institutions is a sign that blockchain ecosystems recognize the importance of such structures. He writes: “the Kleros judiciary, the board-like Graph Council, the constitutionalism of 1Hive, the protocol politicians—they are not the same as their old-world counterparts, but their reappearance also suggests a growing recognition of the need for political institutions in some form.” (Schneider, 2022).

Vitalik Buterin expresses broad agreement with Schneider’s conclusions that non-economic layers should be integrated into blockchain systems (Buterin, 2022). He argues that the financialization of many blockchain applications is a result of the limited tools they possess to prevent collusion. However, Buterin notes that the possibility to fork, an ultimate defense in many blockchain systems including Kleros, relies on social coordination as well as economic motivations (Buterin, 2022). In subsequent work, Buterin along with Weyl and Ohlhaver has argued that non-transferrable Soulbound Tokens can be used to encourage non-financial social structure in decentralized communities (Weyl et al., 2022).

The financialization of the juror role potentially has some sociological implications not directly related to blockchain governance as well. The introduction of stacking and slashing-based cryptoeconomic incentives fundamentally alters the intrinsic relationship not only between parties and jurors, but also the jurors among themselves. The jurors are no longer aloof observers making value judgments from an independent perspective; they are instead potentially competing with each other during every dispute they are drawn in.

Moreover, because jurors have a vested interest in the outcome of the dispute, they are also able to appeal a verdict if they find themselves in the minority (Alencar and Lesaege, 2020). In this way, jurors can be considered another category of the disputing parties themselves. This changed reality of the party-juror and juror-juror relationship throws up several interesting conundrums that may require further research from a moral philosophy and sociological perspective.

For instance, there is a category of disputes known as “good faith disputes”, where neither disputing party can be stated to be “at fault”. Such disputes may commonly arise, for instance, due to reliance on differing (yet valid) standards for assessing a fact situation or because of the occurrence of unforeseen events that radically alter the nature of the contractual relationship (Summers, 1968). It is possible that the stacking and slashing mechanisms at play may possibly render such nuances inconsequential (at least in a binary voting system). Further research looking into how to design decentralized mechanisms to deal with potential good faith disputes may be critical to ensure proper conflict resolution.

Moreover, some thinkers have mentioned that the role of jury duty is not only to deliver justice, but also to deliver broader benefits to society, such as educating citizens on current affairs, instilling good habits in them, and a means of empowering citizens to exercise sovereignty in a democracy (Papke, 2021; Dzur, 2010). There are some commentators that are skeptical about decentralized justice systems because they encourage “speculative profit-seeking” from jurors in “another form of precarious platform work that is endemic to so-called ‘sharing economies’” and “ignores the important role courts have not only in dispute resolution, but also in creating and regulating societal and economic norms.” (Dylag and Smith, 2021) It would be interesting to have further research that thoroughly investigates what social externalities decentralized arbitration mechanisms may be associated with.

6.2 Decentralized justice and international business ethics

Finally, a number of research opportunities might come from the field of international business ethics (Donalson, 1989). One of the key problems in this field is how to discover what norms are applicable in the context of international business where clashes of standards are common across cultures: “The Gordian knot of international business ethics is formed around the vexing question, how should a company behave when the standards followed in the host country are lower than those followed in the home country?” (Donalson and Dunfee, 1999).

Different frameworks have been proposed to answer this question, coming from normative perspectives such as utilitarianism (Elfstrom, 1991), Kantian ethics (Bowie, 2017) and Aristotelian virtue ethics (Solomon, 1992). Notably, a contractarian approach known as Integrative Social Contracts Theory (Donaldson and Dunfee, 1994) suggests a normative heuristic in order to conduct the norm discovery process. Different proposals were conducted for discovering what this theory calls hypernorms (valid universally across cultures) and authentic norms (valid within the boundaries of specific communities) (Hartman et al., 2003; Hartman, 2009; Ast, 2017b). Decentralized justice systems can be utilized as another option under the norm-discovery toolkit, especially in the search for authentic norms. Communities composed of individuals with overlapping values, interests or other traits can leverage focal points to distinguish acceptable conduct from taboos using decentralized justice systems relying on the edicts of social hierarchies. From a Hayekian perspective, these communities of practice (Wenger-Trayner and Wenger-Trayner, 2015) may benefit from the inclusion of an economically incentivized way of discovering valid norms.Under this perspective, it is impossible to ascertain what the ethical norms in a community would be ahead of time, and rules of a community instead present themselves as an adaptation of society to its environment and of the general characteristics of its members, constantly evolving to meet the needs of its individual members (Stringham, 2015).

Crowdsourced wisdom peppered with economic incentives in such sensitive areas may understandably cause concern and even moral panic. However, there are other instances where seemingly impossible crowdsourced models ended up excelling. For instance, Wikipedia was an innovative model for putting content creation in the hands of the community of users. The wisdom of the crowd proved better than the centralized expert curation model that had been at the heart of the encyclopedia for the past 300 years. Even though in the early days many were skeptical, Wikipedia proved that with the right mechanism design for rewards and punishments the wisdom of the crowd can produce a good quality encyclopedia at low cost based on anonymous online contributors.

6.3 Summary of research directions to address moral challenges

The interaction of decentralized justice systems with conventional morality may thus be a rich direction for research. Interesting topics may include the following:

- What are the main moral impediments for adoption of decentralized justice systems, considering that the mechanism works quite differently to traditional online dispute resolution systems?

- What aspects of decentralized justice tend to produce more friction with traditional understandings of how a dispute resolution system should work? Are perceptions of fairness affected by variables such as cultural background (e.g., Hofstede’s cultural dimensions) (Hofstede and Minkov, 2005), legal background (e.g., civil law tradition vs common law tradition) (Brand and Getzler, 2012; Dainow, 1966), age, gender or other elements from participants? Are there use cases where the perception of fairness of decentralized justice systems is higher or lower?

- Within decentralized justice systems, are there potential improvements that could be done to the mechanism design which could result in a higher fairness perception?

- How do decentralized justice systems interact with the normative research produced in the field of business ethics?

7 Conclusion

Throughout history, communities had to face the challenge of maintaining social order and fairness in their social and economic interactions. They have built different dispute resolution systems depending on their set of problems, their system of beliefs and the technology available to them. Ancient Athenians conducted their trials with randomly selected citizens as jurors. The merchant courts of the Middle Ages were based on peer judges following the Lex Mercatoria. Contemporary legal systems put legal decisions in the hands of professional attorneys and judges.

The international arbitration framework created in the context of the New York Convention was successful in guiding dispute resolution processes for global trade and investment over decades. Now the accelerated pace of technology and economic change is transforming the world economy into a web of low-value transactions involving goods, services, labor and capital across borders. This is creating a vast number of disputes that are not adequately addressed by the traditional practice of arbitration (Shcherbyna, 2021).

In 2001, Ethan Katsh, the “father” of Online Dispute Resolution, observed: “The power of technology to resolve disputes is exceeded by the power of technology to generate disputes”. This seems to be even more true over 20 years after it was first uttered (Cohen and Nappert, 2019). Most of our economic transactions happen online in worlds that look more like metaverses where anonymous users will transact in digitally native jurisdictions.

As in every new field of research, a wide number of exciting research opportunities are open for those who jump in early. In this paper, we have categorized the challenges in technical, market, legal and moral elements.

The limits between these four challenges are not clear-cut and they might overlap with each other. All of them taken together result in a critical question to be answered in order to foster the adoption of decentralized justice systems: what are the use cases where decentralized justice solves a business problem (market challenge) in a secure and efficient way (technical challenge) while complying with the applicable regulations (legal challenge) and is perceived as fair by the community (moral challenge)?

Decentralized justice is a promising framework for dispute resolution in a world transitioning into Web3 and the metaverse (Lamontanaro, 2020; Treiblmaier et al., 2021). Since the launch of the first decentralized justice system in 2018, it has caught the attention of a wide range of stakeholders, individuals and institutions alike. Events concerning the future and impact of decentralized justice have become a mainstay in contemporary academia, with well-attended events having been held in the United States (Lunch Talk, 2021), France (Kleros, 2020), United Kingdom (Ast, 2020d), and more (Raczynski and Ast, 2018; Proof of Humanity with Enrique Piqueras, 2020; Eyal Winter Game Theory, 2021; Ast, 2021c). Additionally, decentralized justice applications have begun to find a place for discussion in the syllabi of law schools (Leiter and Dogot, 2020; University of Canberra, 2020) and dedicated research groups are forming to assess the interplay between law, justice, and blockchain (Yépez Idrovo et al., 2020).

Decentralized justice systems have attracted interest from beyond the ivory tower of scholarly pursuits as well, with international organizations such as WIPO (WIPO, 2022) and UNCITRAL (UNCITRAL, 2022) taking an interest in how such mechanisms can shape the future of law.

In this article, we have reviewed the learnings both “from the trenches and the ivory tower” of recent years as well as recurrent criticisms and paths for future exploration. We hope this paper was useful for reviewing the early first hand experiences we had from decentralized justice after working on it for nearly 5 years. Decentralized justice is still in the early stages of development, and there is much potential for innovation and improvements. But the goal is clear in creating a fundamental governance infrastructure that is native to the Internet Age. Just as cryptocurrencies provide banking to the unbanked, decentralized justice can provide justice to the “unjusticed.”

Author contributions

FA contributed mainly in designing the main idea and structure of the paper and in the business section. WG and YA contributed mainly in the technical and game theory sections. JK and AS contributed mainly in the legal sections. All authors contributed to the article and approved the submitted version.

Acknowledgments

The authors wish to thank Karla Spanier who designed all original illustrations in this article.

Conflict of interest

FA, JK, YA and AS are members of the Kleros Cooperative, the developer of the Kleros Protocol, one of the decentralized justice protocols mentioned in the article. WG is a contractor conducting research work for the Kleros Cooperative.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: decentralized justice, law, blockchain, arbitration, dispute resolution, access to justice, smart contracts

Citation: Ast F, George W, Kamalova J, Sharma A and Aouidef Y (2023) Decentralized justice: state of the art, recurring criticisms and next-generation research topics. Front. Blockchain 6:1204090. doi: 10.3389/fbloc.2023.1204090

Received: 11 April 2023; Accepted: 31 July 2023;
Published: 09 October 2023.

Edited by:

Andrej Zwitter, University of Groningen, Netherlands

Reviewed by:

Darcy W. E. Allen, RMIT University, Australia
Alex Butean, Lucian Blaga University of Sibiu, Romania

Copyright © 2023 Ast, George, Kamalova, Sharma and Aouidef. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Federico Ast, ZmVkZXJpY29hc3RAZ21haWwuY29t

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