HCI for Blockchain: Studying, Designing, Critiquing and Envisioning Distributed Ledger Technologies

This workshop aims to develop an agenda within the CHI community to address the emergence of blockchain, or distributed ledger technologies (DLTs). As blockchains emerge as a general purpose technology, with applications well beyond cryptocurrencies, DLTs present exciting challenges and opportunities for developing new ways for people and things to transact, collaborate, organize and identify themselves. Requiring interdisciplinary skills and thinking, the field of HCI is well placed to contribute to the research and development of this technology. This workshop will build a community for human-centred researchers and practitioners to present studies, critiques, design-led work, and visions of blockchain applications

PizzaBlock: Designing Artefacts and Roleplay to Understand Decentralised Identity Management Systems

This pictorial describes in detail the design, and multiple iterations, of PizzaBlock - a role-playing game and design workshop to introduce non-technical participants to decentralised identity management systems. We have so far played this game with six different audiences, with over one hundred participants - iterating the design of the artefacts and gameplay each time. In this pictorial, we reflect on this RtD project to unpack: a) How we designed artefacts and roleplay to explore decentralised technologies and networks; b) How we communicated the key challenges and parameters of a complex system, through the production of a playable, interactive, analogue representation of that technology; c) How we struck a balance between playful tangible gameplay and high-fidelity technical analogy; and d) How approaches like PizzaBlock invite engagement with complex infrastructures and can support more participatory approaches to their design

Algorithmic Authority of the Bitcoin Blockchain

In this thesis, I expand on the concept of algorithmic authority, a concept that I introduced in earlier work to understand the role of algorithms in daily life. Algorithmic authority is the legitimate power of algorithms to direct human action and to impact which information is considered true. In contrast to much other work on algorithms in sociotechnical systems, I argue for more precise use of the word “algorithm”, as well as for the importance of studying algorithmic systems that do consist of “black box algorithms”. Through a study of the users of the cryptocurrency Bitcoin, I explore what it means to trust in algorithmic authority in an open source, decentralized system and contrast it with the authority of centralized and corporate software. My study utilizes data from my survey, interviews, and observation of the broader Bitcoin community. I examine the tensions between members of the Bitcoin community who would prefer to integrate Bitcoin into institutions and those that saw it as a radical use of algorithmic authority. I describe how my participants preferred algorithmic authority to the authority of conventional institutions that they saw as untrustworthy. However, they acknowledged the need for mediating algorithmic authority with human judgment. I examine these tensions between how they would like Bitcoin to be used and how it is being used, and what those tensions can tell us about algorithmic authority. Lastly, I suggest future research directions for examining a wider range of algorithms and better understanding the Bitcoin community

Algorithmic Authority: The Case of Bitcoin

In this paper, we propose a new concept for understanding the role of algorithms in daily life: algorithmic authority. Algorithmic authority is the legitimate power of algorithms to direct human action and to impact which information is considered true. We use this concept to examine the culture of users of Bitcoin, a crypto-currency and payment platform. Through Bitcoin, we explore what it means to trust in algorithms. Our study utilizes interview and survey data. We found that Bitcoin users prefer algorithmic authority to the authority of conventional institutions, which they see as untrustworthy. However, we argue that Bitcoin users do not have blind faith in algorithms; rather, they acknowledge the need for mediating algorithmic authority with human judgment. We examine the tension between members of the Bitcoin community who would prefer to integrate Bitcoin with existing institutions and those who would prefer to resist integration